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Kashiwazaki-Kariwa Nuclear Power Plant

January 07, 2023

The Kashiwazaki-Kariwa Nuclear Power Plant (柏崎刈羽原子力発電所, Kashiwazaki-Kariwa genshiryoku-hatsudensho, Kashiwazaki-Kariwa NPP) is a large, modern (housing the world's first advanced boiling water reactor or ABWR) nuclear power plant on a 4.2-square-kilometer (1,000-acre) site.[1] The campus spans the towns of Kashiwazaki and Kariwa in Niigata Prefecture, Japan, on the coast of the Sea of Japan, where it gets cooling water. The plant is owned and operated by Tokyo Electric Power Company (TEPCO), and it is the largest nuclear generating station in the world by net electrical power rating.

Kashiwazaki-Kariwa Nuclear Power Plant
Aerial view. The breakwaters where seawater is taken from in order to cool waste heat water, can be seen clearly.
CountryJapan
Coordinates37°25′42″N 138°36′06″E / 37.42833°N 138.60167°E / 37.42833; 138.60167Coordinates: 37°25′42″N 138°36′06″E / 37.42833°N 138.60167°E / 37.42833; 138.60167
StatusOut of service
Construction beganJune 5, 1980 (1980-06-05)
Commission dateSeptember 18, 1985 (1985-09-18)
Owner(s)
Operator(s)Tokyo Electric Power Company
Cooling sourceSea of Japan
Power generation
Units operational5 × 1,067 MW
2 × 1,315 MW
Nameplate capacity7,965 MW
Capacity factor0%
Annual net output0 GW·h
External links
Websitewww.tepco.co.jp/nu/kk-np/index-j.html
CommonsRelated media on Commons
[edit on Wikidata]

On July 16, 2007, the Chūetsu offshore earthquake took place, with its epicenter located only 19 km (12 mi) from the plant. The earthquake registered Mw 6.6, ranking it among the strongest earthquakes to occur in immediate range of a nuclear power plant.[1] This shook the plant beyond design basis and initiated an extended shutdown for inspection, which indicated that greater earthquake-proofing was needed before operation could be resumed. The plant was completely shut down for 21 months following the earthquake. Unit 7 was restarted after seismic upgrades on May 19, 2009, followed later by units 1, 5, and 6. (Units 2, 3, and 4 were not restarted by the time of the March 2011 earthquake).

The four restarted and operating units at the plant were not affected by the March 11, 2011 earthquake, but later all restarted units were shut down while safety improvements were being carried out. As of May 2022, all units remain idle; however, TEPCO has struggled to get recertified by the Japanese Nuclear Regulation Authority (NRA).[2][3]

Reactors

There are seven reactor units spread across the campus coast line. Numbering starts at Unit 1 with the south-most unit through Unit 4, then there is a large green space in between Unit 4 and 7, then it continues with Units 6 and 5.[4]

 
The Kashiwazaki-Kariwa Nuclear Power Plant, a nuclear plant with seven units, the largest single nuclear power station in the world, was completely shut down for 21 months following an earthquake in 2007.[5]
Reactor attributes
KK – 1 KK – 2 KK – 3 KK – 4 KK – 5 KK – 6 KK – 7
Reactor Type BWR BWR BWR BWR BWR ABWR ABWR
Net Power (MW) 1,067 1,067 1,067 1,067 1,067 1,315 1,315
Gross Power (MW) 1,100 1,100 1,100 1,100 1,100 1,356 1,356
Start of Construction 5/6/1980 18/11/1985 7/3/1989 5/3/1990 20/6/1985 3/11/1992 1/7/1993
First Criticality 12/12/1984 30/11/1989 19/10/1992 1/11/1993 20/7/1989 18/12/1995 1/11/1996
Commission date 18/9/1985 28/9/1990 11/8/1993 11/8/1994 10/4/1990 7/11/1996 2/7/1997
Installation Costs
(1,000 yen/kW)		 330 360 310 310 420 310 280[6]
Reactor/NSSS Supplier Toshiba Toshiba Toshiba Hitachi Hitachi Hitachi/
Toshiba/GE		 Hitachi/
Toshiba/GE

The power installation costs for units at this site well reflect the general trend in costs of nuclear plants. Capital costs increased through the 1980s but have become cheaper in modern times. The last two units were the first Advanced Boiling Water Reactors (ABWRs) ever built.

Performance

 
Despite frequent changes in performance year to year due to routine outages, the entire plant operated at almost continuous power output until the plant-wide events of the 2000s.

Operating a single large plant comprising this many reactors has several economic advantages. One such benefit is the limited impact of single-reactor refueling outages during the replacement cycle; one dormant reactor makes minimal impact on the plant's net power production. A smooth transition was seen in the power production history of the plant up through the time the last two units were built. Currently, however, there are no active reactors at the Kashiwazaki-Kariwa plant. TEPCO has outlined plans to restart Reactor 6 and Reactor 7 and is awaiting approval from the government and citizens before the reactors are permitted to restart.[7]

Partial shutdowns

In February 1991, Unit 2 was automatically shut down following a sudden drop in oil pressure inside the steam turbine.[8]

On July 18, 1997, radioactive steam leaked from a gauge within Unit 7 of the Kashiwazaki-Kariwa plant. In May, a burst tube had delayed trial runs at the plant, and earlier in July smoke had been found coming from plant machinery.[9]

In January 1998, Unit 1 was shut down after increasing radiation levels in the steam driving the turbine triggered alarms. The levels were reportedly 270 times the expected operating level.[10]

Reactors at the plant were shut down one by one following the 2002 discovery that TEPCO had deliberately falsified data surrounding safety inspections.[11] The first reactor was taken offline September 9, 2002, and the final reactor was taken offline January 27, 2003.[12] The newest units, the more inherently safe ABWRs, were taken back online the quickest and suffered the smallest effect. Units 1, 2, and 3, on the other hand, generated no electricity during the fiscal year of 2003.

Complete shutdowns

Units 1-4 were completely shut down in 2008. Only Unit 1 was temporarily restarted in 2010–2011. Unit 5 was temporarily restarted between 2010 and 2012 after a shut down in 2007. Following the Fukushima disaster in 2011, Unit 1 was shut down again in 2012 along with units 5–7. As of May 2022, the plant remains idle.[13]

Fuel

All reactors continue to use low-enriched uranium as the nuclear fuel; however, there have been plans drafted by TEPCO to use MOX fuel in some of the reactors by the permission of the Japanese Atomic Energy Commission (JAEC). A public referendum in the Kariwa village in 2001 voted 53% against use of the new fuel. After the 2002 TEPCO data fabrication scandals, the president at the time, Nobuya Minami [jp], announced that plans to use the MOX fuel at the KK plant would be suspended indefinitely.

Earthquakes

See also: Nuclear power in Japan § Seismicity

Earthquake resistant design features

Sand at the sites was removed and the reactor was built on firm ground. Adjacent soil was backfilled. Basements of the reactor buildings extend several levels down (maximum of 42 m below grade).[14] These underground elements stabilize the reactor buildings, making them less likely to suffer sway due to resonance vibrations during an earthquake. As with other Japanese power plants, reactors at the plant were built according to earthquake-resistance standards, which are regulated by law and the JAEC.

In 2006 safety standards for earthquake resistance in Japan's nuclear plants were modified and tightened. After the 2007 earthquake suspicions arose that another fault line may be closer to the plant than originally thought, possibly running straight through the site.

2007 Chūetsu offshore earthquake

 
The offshore fault lines near the plant. Some faults were discovered through research after the major earthquake while some were known before.

The KK plant was 19 kilometers away from the epicenter of the magnitude 6.6 2007 Chūetsu offshore earthquake, which took place 10:13 a.m., July 16, 2007. Peak ground acceleration of 6.8 m/s2 (0.69 g) was recorded in Unit 1 in the east–west direction, above the design specification for safe shutdown of 4.5 m/s2, and well above the rapid restart specification for key equipment in the plant of 2.73 m/s2.[15] Units 5 and 6 also recorded shaking over this limit.[16] Shaking of 20.58 m/s2 was recorded in the turbine building of Unit 3.[17]

Those nearby saw black smoke which was later confirmed to be an electric transformer that had caught fire at Unit 3.[18][19] The fire was put out by noon on the day of the quake, about 2 hours after it started. The 3-story transformer building was extensively charred.[20]

Reactor units 3, 4, and 7 all automatically powered down safely in response to the quake. Unit 2 was in startup mode and not online.[14] Units 1, 5, and 6 were already shut down for inspection at the time.[21] TEPCO was ready to restart some of the units as of the next day, but the trade ministry ordered the plant to remain idle until additional safety checks could be completed. On Wednesday, July 18, the mayor of Kashiwazaki ordered operations at the plant to be halted until its safety could be confirmed.[22] The Nikkei reported that government safety checks could delay the restart for over a year, without stating the source of the information.[23] For comparison, in 2005, a reactor at the Onagawa Nuclear Power Plant was closed for five months following an earthquake.[23]

IAEA inspections

The International Atomic Energy Agency (IAEA) offered to inspect the plant, which was initially declined. The governor of Niigata prefecture then sent a petition to Shinzo Abe. On Sunday, July 22, 2007, the Nuclear and Industrial Safety Agency (NISA) announced that it would allow inspectors from the United Nations to review the damage.[24]

A team from the IAEA carried out a four-day inspection, as investigations by Japan's Nuclear and Industrial Safety Agency (NISA), Nuclear Safety Commission (NSC) and the Tokyo Electric Power Company (TEPCO) continued.[25] The team of the IAEA confirmed that the plant had "shut down safely" and that "damage appears less than expected."[26] On August 19, the IAEA reported that, for safety-related and nuclear components, "no visible significant damage has been found" although "nonsafety related structures, systems and components were affected by significant damage".[27]

The official report issued by the IAEA stated that the plant "behaved in a safe manner" after a 4-day inspection. Other observations were:

  • "Safety related structures, systems and components of the plant seem to be in a general condition, much better than might be expected for such a strong earthquake, and there is no visible significant damage"
  • Conservatisms introduced in the construction of the plant compensated for the magnitude of the earthquake being so much greater than planned for.

Recommendations included:

  • A re-evaluation of the seismic safety.
  • Detailed geophysical investigations[28]

External inspections of the plant were planned to be completed by the end of July 2008. The schedule was confirmed on 10 July 2008 by the site superintendent, Akio Takahashi. On July 15, Akira Amari said his ministry was also continuing their own tests. An IAEA workshop in June 2008 recognized that the earthquake exceeded the "seismic input" used in the design in that plant, and that regulations played a critical role in keeping the plant safe.[29] However, TEPCO determined that significant upgrades were required to cope with the improved understanding of the seismic environment and possible shaking effects at the plant site.

The IAEA sent a team for a follow-up visit in January 2008. They concluded that much high-quality inspection work had been undertaken and noted the likely improvements to nuclear seismic design worldwide that may result from this process.[30] An additional visit from an IAEA team of 10 experts occurred in December 2008, noting that the "unexpectedly large ground motions" were now well understood and could be protected against, and further confirming the safe performance of the plant during the quake.[31][32]

Radioactivity releases

Initially, it was thought that some water (estimated to be about 1.5 L) from the spent fuel pool leaked into the Sea of Japan as a result of the quake.[33][34] Later, more detailed reports confirmed a number of releases, though most of them were far less active than common natural radiation sources. According to the NISA, this was the first time a release of radioactive material happened as a result of an earthquake.

  • 0.6 litres of slightly radioactive water leaked from the third floor of the Unit 6 reactor building, which contained 280 becquerels of radioactivity. (For reference, a household smoke detector typically contains 37,000 becquerels (1.0 μCi) of radioactivity,[35] and a living adult human typically has around 8000 Bq of naturally occurring radioactivity inside their body).
  • 0.9 litres of slightly radioactive water leaked from the inner third floor of the Unit 6 reactor building, containing 16,000 Bq of radioactivity.
  • From unit 6, 1.3 cubic meters of water from the spent fuel pool leaked through a drainage pipe and ultimately into the Sea of Japan. The water contained 80 Bq/L, totaling 90,000 Bq in the release.[36] For comparison, an Onsen located in Misasa, Tottori, Japan uses water with a large concentration of radon, which gives it a radioactivity of 9300 Bq/L. The leaked water from the plant did not pose a health risk even before being diluted. Towels were used to mop up the water.[37]
  • On Wednesday, 18 July 2007, at Unit 7, radioactive iodine was found leaking from an exhaust pipe by a government inspector, the leak began between Tuesday and Wednesday and was confirmed to have stopped by Thursday night. The amount of iodine released was estimated at 12 million Bq and the total amount of particulate radioactivity released into the air was about 402,000,000 Bq.[38] This was said to have been one 10 millionth of the legal limit.[39] It is estimated that this caused an unintentional dose of 0.0002 nanosieverts (nSv), per person distributed among around 10 million people. The limit for dose to the public from the operations of a nuclear plant in Japan in one year is 1100 nSv, and, for comparison, natural background radiation worldwide for humans is on average around 2,400,000 nSv/year (2.4 mSv/year). In regards to the cause, Yasuhisa Shiozaki said "This is an error of not implementing the manual," because the vent should have been closed.[40]

Other problems

About 400 drums containing low-level nuclear waste stored at the plant were knocked over by the aftershocks, 40 losing their lids.[41] Company officials reported on July 17 that traces of the radioactive materials cobalt-60, iodine, and chromium-51 had been released into the atmosphere, presumably from the containers losing their lids.

Criticisms of the company's response to the event included the time it took the company to report events and the certainty with which they were able to locate the source of various problems. TEPCO's president made a comment the site was a "mess"[42] after visiting post-quake. While the reported amount of leaked radioactivity remained far below what poses a danger to the public, details changed multiple times in the few days after the quake and attracted significant media attention. After the quake, TEPCO was supposedly investigating 50 separate cases of "malfunctioning and trouble,"[43] a number that was changed to 63 cases later.[44] Even the radioactivity sensors around the site encountered trouble, the reading from these devices are normally available online, giving the public a direct measure of ambient radioactivity around the site, but due to damage sustained during the earthquake, stopped reporting on the website. The company published an apology on that page, and data from the devices covering the off-line period was released later, showing no artificial abnormalities (note that the readings naturally fluctuate depending on whether it's raining or snowing and a host of other factors).[45]

TEPCO's president maintained that fears of a leak of radioactive material were unfounded (since the amount leaked into the ocean was a billionth of the legal limit), but many international reporters expressed distrust of the company that has a history of cover-up controversies. The IAEA's Mohamed ElBaradei encouraged full transparency throughout the investigation of the accident so that lessons learned could be applied to nuclear plants elsewhere.[42]

Impact

News of the earthquake, combined with the fact that replacement power sources (such as oil and gas) are at record highs, caused TEPCOs stock to plummet 7.5%, the largest drop in seven years, which amounted to around US$4.4 billion lost in stock capitalization.[46] This made the event even more costly to the company than the 2002 data falsification scandal. Additionally, TEPCO warned that the plant closure could cause a power shortage during the summer months.[43] Trade minister Akira Amari requested that business users cut electricity use,[47] and in August TEPCO was forced to reduce electricity supplies for industrial uses, the first time it had to resort to such measures in 17 years.[48]

Reports of the leak caused thousands of cancellations at resorts and hotels along the Sea of Japan coast, even as far as Murakami, Niigata (140 km northeast) and Sado Island. Inn owners have said that rumors have been more damaging than direct effects of the earthquake.[49]

The shutdown forced TEPCO to run natural gas plants in place of this plant, not only increasing Japan's demand for the fuel and increasing the price internationally, but also increasing carbon dioxide output such that Japan will have difficulty meeting the Kyoto Protocol.

Restart

After 16 months of comprehensive component-based assessment and upgrades on all seven reactors, this phase of post-earthquake response was almost complete, with Reactor 7 fully upgraded to cope with the seismic environment. On 8 November 2008, fuel loading in reactor Unit 7 started, preparatory to a period of system safety tests on that reactor.[50] On 19 February 2009 TEPCO applied to the local governance to restart Unit 7 after having obtained approval from the national government and regulators.[51] Local government agreement for restart was granted in May[52] and electrical grid power was supplied from Unit 7 at 20% power on 19 May.[53] The reactor was raised to 100% power on 5 June 2009 as part of a series of restart tests.[54]

Unit 6 restarted on 26 August 2009[55] and reconnected to the grid on 31 August.[56]

Unit 1 restarted on 31 May 2010[57] after loading with fuel (along with Unit 5) earlier in the year, and was generating grid power by 6 June 2010.[58]

Unit 5 recommenced grid generation on 26 November 2010, in the same week that fuel loading for Unit 3 started.[59]

Units 2, 3, and 4 were not restarted.

2011 Tōhoku earthquake

The reactors were shut down indefinitely following the 2011 Tōhoku earthquake and tsunami. Plans to restart units 6 and 7 were delayed after problems developed with the intruder detection system.[60]

Facility improvements after Fukushima I nuclear accidents

On 21 April 2011, after the Fukushima Daiichi nuclear disaster, TEPCO announced a plan to build up the seawall to a height of 15 m (49.2 ft) above sea level and spanning more than 800 m (2,624 ft) in length for units 1–4, and more than 500 m (1,640 ft) for units 5–7 by June 2013. The height of a potential tsunami was assumed to be 3.3 m. Also, plans were made to rebuild the radioactive overflow storage pool to be completed by September 2012.[61]

2011–2012: Survey on tsunamis in the past

On 10 November 2011, TEPCO announced a survey for signs of past tsunamis in this area. With drills, soil samples were to be taken of sediment layers dating from the year 1600 back to 7000 years ago, at nine locations around the plant at the coast of central Japan. This survey, the first that TEPCO ever conducted on this subject, did start on 15 November 2011, and was planned to be completed in April 2012, and was done to examine the possibility of higher tsunamis than had been expected at the time the plant was designed and built.[62]

On 26 April 2012, TEPCO said that it would recalculate the risks of earthquakes and tsunamis. This was done after reports, as published by four prefectures around the nuclear Plant, re-estimated the risks of potential earthquakes in the region:

The calculated earthquake magnitudes are almost three times stronger than all the calculations done by TEPCO regarding the safety assessments for the plant. These were based on a magnitude 7.85 quake caused by a 131 kilometer long fault near Sado Island in Niigata and a 3.3 meter-high tsunami. To endure this, an embankment was under construction to resist tsunami waves up to 15 meters high. The recalculation could have consequences for the stress tests and safety assessments for the plant.[63]

After the planned revision of the safety standards in July 2013, some faults under the reactors were considered as geologically active. This was found by Japanese news agency Kyodo News on 23 January 2013 in papers and other material published by TEPCO. Under the new regulations, geologic faults would be considered to be active if they had moved within the last 400,000 years, instead of the less stringent standard of 120 000 years, as was formerly accepted.

Two faults, named "Alpha" and "Beta," are present under Reactors 1 and 2. Other faults are situated under Reactor 3 and Reactor 5, as well as underneath the building of Reactor 4. Under the new regulations, the beta-fault could be classified as active because it moved a ground layer including volcanic ash around 240,000 years ago. The outcome of the study might trigger a second survey by the newly installed Japanese regulator NRA. In January 2013, studies were conducted or planned on geological faults around six Japanese reactor sites. The Kashiwazaki-Kariwa plant would be number seven.[64]

Current Status

Kashiwazaki-Kariwa is one of the 44 nuclear power plants in Japan that have been rendered inactive in the years following the Fukushima Daiichi Accident. By October 2020, the Japanese government had inspected the plant, and by January 2020, TEPCO had completed its improvements on Unit 7. The company outlined plans to restart the reactor as early as the end of the Japanese 2022 Fiscal year (31 March 2022), however, the Nuclear Regulation Authority released a report in April 2021 indicating that there were serious security infractions and enacted an order that postponed the restart indefinitely.[60][65][66]

Following the April 2021 NRA report, TEPCO admitted that its intruder detection system was left broken in order to reduce costs[67] and confirmed that an unauthorized personnel member used a colleague's ID card to access the plant's central control room in September 2020. In response, TEPCO plans to implement anti-terrorism measures, install an intrusion detection system, and hire an additional 30 guards to protect nuclear material at the facility. The power company intends to invest ¥20 Billion (US$165.4 Million) on these security measures from 31 March 2023 to 31 March 2028.[65]

According to a report from TEPCO, the NRA began Additional Inspection (Phase II) to monitor the new security measures at the plant.[68] In April 2022, it was confirmed that the security flaws revealed in the NRA's April 2022 report were limited to Kashiwazaki-Kariwa and not indicative of a widespread issue throughout the company's culture.[69] TEPCO is planning on moving nearly 40% of their nuclear division employees to Niigata Prefecture in preparation of its plans to restart Reactor 7 and begin rebuilding trust in the citizens, but the future of Kashiwazaki-Kariwa is still uncertain.[70] As of 26 May 2022, the local government has yet to move forward with approval for TEPCO to set forth their plans to restart.[71] According to a 2021 survey by Niigata Nippo, just over half of Niigata prefecture residents oppose a nuclear restart.[72]

See also

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Niigata Chuetsu Offshore earthquake

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January 07, 2023
kashiwazaki, kariwa, nuclear, power, plant, this, article, need, reorganization, comply, with, wikipedia, layout, guidelines, please, help, editing, article, make, improvements, overall, structure, january, 2020, learn, when, remove, this, template, message, 柏. This article may be in need of reorganization to comply with Wikipedia s layout guidelines Please help by editing the article to make improvements to the overall structure January 2020 Learn how and when to remove this template message The Kashiwazaki Kariwa Nuclear Power Plant 柏崎刈羽原子力発電所 Kashiwazaki Kariwa genshiryoku hatsudensho Kashiwazaki Kariwa NPP is a large modern housing the world s first advanced boiling water reactor or ABWR nuclear power plant on a 4 2 square kilometer 1 000 acre site 1 The campus spans the towns of Kashiwazaki and Kariwa in Niigata Prefecture Japan on the coast of the Sea of Japan where it gets cooling water The plant is owned and operated by Tokyo Electric Power Company TEPCO and it is the largest nuclear generating station in the world by net electrical power rating Kashiwazaki Kariwa Nuclear Power PlantAerial view The breakwaters where seawater is taken from in order to cool waste heat water can be seen clearly CountryJapanCoordinates37 25 42 N 138 36 06 E 37 42833 N 138 60167 E 37 42833 138 60167 Coordinates 37 25 42 N 138 36 06 E 37 42833 N 138 60167 E 37 42833 138 60167StatusOut of serviceConstruction beganJune 5 1980 1980 06 05 Commission dateSeptember 18 1985 1985 09 18 Owner s TEPCOOperator s Tokyo Electric Power CompanyCooling sourceSea of JapanPower generationUnits operational5 1 067 MW2 1 315 MWNameplate capacity7 965 MWCapacity factor0 Annual net output0 GW hExternal linksWebsitewww wbr tepco wbr co wbr jp wbr nu wbr kk np wbr index j wbr htmlCommonsRelated media on Commons edit on Wikidata On July 16 2007 the Chuetsu offshore earthquake took place with its epicenter located only 19 km 12 mi from the plant The earthquake registered Mw 6 6 ranking it among the strongest earthquakes to occur in immediate range of a nuclear power plant 1 This shook the plant beyond design basis and initiated an extended shutdown for inspection which indicated that greater earthquake proofing was needed before operation could be resumed The plant was completely shut down for 21 months following the earthquake Unit 7 was restarted after seismic upgrades on May 19 2009 followed later by units 1 5 and 6 Units 2 3 and 4 were not restarted by the time of the March 2011 earthquake The four restarted and operating units at the plant were not affected by the March 11 2011 earthquake but later all restarted units were shut down while safety improvements were being carried out As of May 2022 all units remain idle however TEPCO has struggled to get recertified by the Japanese Nuclear Regulation Authority NRA 2 3 Contents 1 Reactors 1 1 Performance 1 2 Partial shutdowns 1 3 Complete shutdowns 2 Fuel 3 Earthquakes 3 1 Earthquake resistant design features 3 2 2007 Chuetsu offshore earthquake 3 2 1 IAEA inspections 3 2 2 Radioactivity releases 3 2 3 Other problems 3 2 4 Impact 3 2 5 Restart 3 3 2011 Tōhoku earthquake 3 4 Facility improvements after Fukushima I nuclear accidents 3 5 2011 2012 Survey on tsunamis in the past 4 Current Status 5 See also 6 References 7 External links 7 1 Niigata Chuetsu Offshore earthquake 7 2 Entire plantReactors EditThere are seven reactor units spread across the campus coast line Numbering starts at Unit 1 with the south most unit through Unit 4 then there is a large green space in between Unit 4 and 7 then it continues with Units 6 and 5 4 The Kashiwazaki Kariwa Nuclear Power Plant a nuclear plant with seven units the largest single nuclear power station in the world was completely shut down for 21 months following an earthquake in 2007 5 Reactor attributes KK 1 KK 2 KK 3 KK 4 KK 5 KK 6 KK 7Reactor Type BWR BWR BWR BWR BWR ABWR ABWRNet Power MW 1 067 1 067 1 067 1 067 1 067 1 315 1 315Gross Power MW 1 100 1 100 1 100 1 100 1 100 1 356 1 356Start of Construction 5 6 1980 18 11 1985 7 3 1989 5 3 1990 20 6 1985 3 11 1992 1 7 1993First Criticality 12 12 1984 30 11 1989 19 10 1992 1 11 1993 20 7 1989 18 12 1995 1 11 1996Commission date 18 9 1985 28 9 1990 11 8 1993 11 8 1994 10 4 1990 7 11 1996 2 7 1997Installation Costs 1 000 yen kW 330 360 310 310 420 310 280 6 Reactor NSSS Supplier Toshiba Toshiba Toshiba Hitachi Hitachi Hitachi Toshiba GE Hitachi Toshiba GEThe power installation costs for units at this site well reflect the general trend in costs of nuclear plants Capital costs increased through the 1980s but have become cheaper in modern times The last two units were the first Advanced Boiling Water Reactors ABWRs ever built Performance Edit Despite frequent changes in performance year to year due to routine outages the entire plant operated at almost continuous power output until the plant wide events of the 2000s Operating a single large plant comprising this many reactors has several economic advantages One such benefit is the limited impact of single reactor refueling outages during the replacement cycle one dormant reactor makes minimal impact on the plant s net power production A smooth transition was seen in the power production history of the plant up through the time the last two units were built Currently however there are no active reactors at the Kashiwazaki Kariwa plant TEPCO has outlined plans to restart Reactor 6 and Reactor 7 and is awaiting approval from the government and citizens before the reactors are permitted to restart 7 Generation by unit and total TWh Year Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Unit 7 Total1985 4 960 4 9601986 6 704 6 7041987 9 195 9 1951988 6 960 6 9601989 6 442 1 041 7 4841990 5 987 5 386 7 911 19 2841991 9 032 6 642 7 093 22 7671992 6 958 9 047 0 053 6 977 23 0351993 6 874 7 213 6 488 0 012 9 238 29 8251994 7 020 7 291 7 264 6 040 7 155 34 7711995 9 235 7 697 9 254 6 182 7 508 39 8771996 6 814 8 811 7 922 8 068 7 906 5 663 0 058 45 2421997 7 900 7 284 8 016 7 517 8 919 10 161 8 128 57 9261998 6 176 8 142 6 748 9 259 7 353 10 702 9 716 58 0951999 9 199 8 209 9 028 8 142 7 772 9 710 8 445 60 5052000 7 715 8 140 7 945 6 919 7 043 9 412 11 240 58 4132001 7 071 7 595 6 986 5 591 9 199 9 270 10 078 55 7902002 5 906 5 866 5 576 9 240 8 191 11 504 7 990 54 2732003 0 000 0 000 0 000 4 186 1 503 8 401 5 778 19 8692004 6 497 4 660 6 550 5 624 6 135 8 635 10 805 48 9062005 3 126 6 388 6 062 7 192 6 853 11 126 7 977 48 7252006 6 299 9 331 7 331 2 817 8 400 8 447 8 166 50 7922007 3 165 1 830 5 054 5 061 0 0 3 758 6 358 25 2262008 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 02009 0 0 0 0 0 0 0 0 0 0 3 654 5 366 9 022010 5 291 0 0 0 0 0 0 0 780 9 522 9 034 24 6272011 5 606 0 0 0 0 0 0 9 402 10 960 7 349 33 3172012 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 02013 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 02014 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 02015 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 02016 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 02017 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 02018 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 02019 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 02020 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 02021 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0Partial shutdowns Edit In February 1991 Unit 2 was automatically shut down following a sudden drop in oil pressure inside the steam turbine 8 On July 18 1997 radioactive steam leaked from a gauge within Unit 7 of the Kashiwazaki Kariwa plant In May a burst tube had delayed trial runs at the plant and earlier in July smoke had been found coming from plant machinery 9 In January 1998 Unit 1 was shut down after increasing radiation levels in the steam driving the turbine triggered alarms The levels were reportedly 270 times the expected operating level 10 Reactors at the plant were shut down one by one following the 2002 discovery that TEPCO had deliberately falsified data surrounding safety inspections 11 The first reactor was taken offline September 9 2002 and the final reactor was taken offline January 27 2003 12 The newest units the more inherently safe ABWRs were taken back online the quickest and suffered the smallest effect Units 1 2 and 3 on the other hand generated no electricity during the fiscal year of 2003 Complete shutdowns Edit Units 1 4 were completely shut down in 2008 Only Unit 1 was temporarily restarted in 2010 2011 Unit 5 was temporarily restarted between 2010 and 2012 after a shut down in 2007 Following the Fukushima disaster in 2011 Unit 1 was shut down again in 2012 along with units 5 7 As of May 2022 the plant remains idle 13 Fuel EditAll reactors continue to use low enriched uranium as the nuclear fuel however there have been plans drafted by TEPCO to use MOX fuel in some of the reactors by the permission of the Japanese Atomic Energy Commission JAEC A public referendum in the Kariwa village in 2001 voted 53 against use of the new fuel After the 2002 TEPCO data fabrication scandals the president at the time Nobuya Minami jp announced that plans to use the MOX fuel at the KK plant would be suspended indefinitely Earthquakes EditSee also Nuclear power in Japan Seismicity This section may be in need of reorganization to comply with Wikipedia s layout guidelines Please help by editing the article to make improvements to the overall structure August 2017 Learn how and when to remove this template message Earthquake resistant design features Edit Sand at the sites was removed and the reactor was built on firm ground Adjacent soil was backfilled Basements of the reactor buildings extend several levels down maximum of 42 m below grade 14 These underground elements stabilize the reactor buildings making them less likely to suffer sway due to resonance vibrations during an earthquake As with other Japanese power plants reactors at the plant were built according to earthquake resistance standards which are regulated by law and the JAEC In 2006 safety standards for earthquake resistance in Japan s nuclear plants were modified and tightened After the 2007 earthquake suspicions arose that another fault line may be closer to the plant than originally thought possibly running straight through the site 2007 Chuetsu offshore earthquake Edit This section may contain an excessive amount of intricate detail that may interest only a particular audience Please help by spinning off or relocating any relevant information and removing excessive detail that may be against Wikipedia s inclusion policy December 2017 Learn how and when to remove this template message The offshore fault lines near the plant Some faults were discovered through research after the major earthquake while some were known before The KK plant was 19 kilometers away from the epicenter of the magnitude 6 6 2007 Chuetsu offshore earthquake which took place 10 13 a m July 16 2007 Peak ground acceleration of 6 8 m s2 0 69 g was recorded in Unit 1 in the east west direction above the design specification for safe shutdown of 4 5 m s2 and well above the rapid restart specification for key equipment in the plant of 2 73 m s2 15 Units 5 and 6 also recorded shaking over this limit 16 Shaking of 20 58 m s2 was recorded in the turbine building of Unit 3 17 Those nearby saw black smoke which was later confirmed to be an electric transformer that had caught fire at Unit 3 18 19 The fire was put out by noon on the day of the quake about 2 hours after it started The 3 story transformer building was extensively charred 20 Reactor units 3 4 and 7 all automatically powered down safely in response to the quake Unit 2 was in startup mode and not online 14 Units 1 5 and 6 were already shut down for inspection at the time 21 TEPCO was ready to restart some of the units as of the next day but the trade ministry ordered the plant to remain idle until additional safety checks could be completed On Wednesday July 18 the mayor of Kashiwazaki ordered operations at the plant to be halted until its safety could be confirmed 22 The Nikkei reported that government safety checks could delay the restart for over a year without stating the source of the information 23 For comparison in 2005 a reactor at the Onagawa Nuclear Power Plant was closed for five months following an earthquake 23 IAEA inspections Edit The International Atomic Energy Agency IAEA offered to inspect the plant which was initially declined The governor of Niigata prefecture then sent a petition to Shinzo Abe On Sunday July 22 2007 the Nuclear and Industrial Safety Agency NISA announced that it would allow inspectors from the United Nations to review the damage 24 A team from the IAEA carried out a four day inspection as investigations by Japan s Nuclear and Industrial Safety Agency NISA Nuclear Safety Commission NSC and the Tokyo Electric Power Company TEPCO continued 25 The team of the IAEA confirmed that the plant had shut down safely and that damage appears less than expected 26 On August 19 the IAEA reported that for safety related and nuclear components no visible significant damage has been found although nonsafety related structures systems and components were affected by significant damage 27 The official report issued by the IAEA stated that the plant behaved in a safe manner after a 4 day inspection Other observations were Safety related structures systems and components of the plant seem to be in a general condition much better than might be expected for such a strong earthquake and there is no visible significant damage Conservatisms introduced in the construction of the plant compensated for the magnitude of the earthquake being so much greater than planned for Recommendations included A re evaluation of the seismic safety Detailed geophysical investigations 28 External inspections of the plant were planned to be completed by the end of July 2008 The schedule was confirmed on 10 July 2008 by the site superintendent Akio Takahashi On July 15 Akira Amari said his ministry was also continuing their own tests An IAEA workshop in June 2008 recognized that the earthquake exceeded the seismic input used in the design in that plant and that regulations played a critical role in keeping the plant safe 29 However TEPCO determined that significant upgrades were required to cope with the improved understanding of the seismic environment and possible shaking effects at the plant site The IAEA sent a team for a follow up visit in January 2008 They concluded that much high quality inspection work had been undertaken and noted the likely improvements to nuclear seismic design worldwide that may result from this process 30 An additional visit from an IAEA team of 10 experts occurred in December 2008 noting that the unexpectedly large ground motions were now well understood and could be protected against and further confirming the safe performance of the plant during the quake 31 32 Radioactivity releases Edit Initially it was thought that some water estimated to be about 1 5 L from the spent fuel pool leaked into the Sea of Japan as a result of the quake 33 34 Later more detailed reports confirmed a number of releases though most of them were far less active than common natural radiation sources According to the NISA this was the first time a release of radioactive material happened as a result of an earthquake 0 6 litres of slightly radioactive water leaked from the third floor of the Unit 6 reactor building which contained 280 becquerels of radioactivity For reference a household smoke detector typically contains 37 000 becquerels 1 0 mCi of radioactivity 35 and a living adult human typically has around 8000 Bq of naturally occurring radioactivity inside their body 0 9 litres of slightly radioactive water leaked from the inner third floor of the Unit 6 reactor building containing 16 000 Bq of radioactivity From unit 6 1 3 cubic meters of water from the spent fuel pool leaked through a drainage pipe and ultimately into the Sea of Japan The water contained 80 Bq L totaling 90 000 Bq in the release 36 For comparison an Onsen located in Misasa Tottori Japan uses water with a large concentration of radon which gives it a radioactivity of 9300 Bq L The leaked water from the plant did not pose a health risk even before being diluted Towels were used to mop up the water 37 On Wednesday 18 July 2007 at Unit 7 radioactive iodine was found leaking from an exhaust pipe by a government inspector the leak began between Tuesday and Wednesday and was confirmed to have stopped by Thursday night The amount of iodine released was estimated at 12 million Bq and the total amount of particulate radioactivity released into the air was about 402 000 000 Bq 38 This was said to have been one 10 millionth of the legal limit 39 It is estimated that this caused an unintentional dose of 0 0002 nanosieverts nSv per person distributed among around 10 million people The limit for dose to the public from the operations of a nuclear plant in Japan in one year is 1100 nSv and for comparison natural background radiation worldwide for humans is on average around 2 400 000 nSv year 2 4 mSv year In regards to the cause Yasuhisa Shiozaki said This is an error of not implementing the manual because the vent should have been closed 40 Other problems Edit About 400 drums containing low level nuclear waste stored at the plant were knocked over by the aftershocks 40 losing their lids 41 Company officials reported on July 17 that traces of the radioactive materials cobalt 60 iodine and chromium 51 had been released into the atmosphere presumably from the containers losing their lids Criticisms of the company s response to the event included the time it took the company to report events and the certainty with which they were able to locate the source of various problems TEPCO s president made a comment the site was a mess 42 after visiting post quake While the reported amount of leaked radioactivity remained far below what poses a danger to the public details changed multiple times in the few days after the quake and attracted significant media attention After the quake TEPCO was supposedly investigating 50 separate cases of malfunctioning and trouble 43 a number that was changed to 63 cases later 44 Even the radioactivity sensors around the site encountered trouble the reading from these devices are normally available online giving the public a direct measure of ambient radioactivity around the site but due to damage sustained during the earthquake stopped reporting on the website The company published an apology on that page and data from the devices covering the off line period was released later showing no artificial abnormalities note that the readings naturally fluctuate depending on whether it s raining or snowing and a host of other factors 45 TEPCO s president maintained that fears of a leak of radioactive material were unfounded since the amount leaked into the ocean was a billionth of the legal limit but many international reporters expressed distrust of the company that has a history of cover up controversies The IAEA s Mohamed ElBaradei encouraged full transparency throughout the investigation of the accident so that lessons learned could be applied to nuclear plants elsewhere 42 Impact Edit News of the earthquake combined with the fact that replacement power sources such as oil and gas are at record highs caused TEPCOs stock to plummet 7 5 the largest drop in seven years which amounted to around US 4 4 billion lost in stock capitalization 46 This made the event even more costly to the company than the 2002 data falsification scandal Additionally TEPCO warned that the plant closure could cause a power shortage during the summer months 43 Trade minister Akira Amari requested that business users cut electricity use 47 and in August TEPCO was forced to reduce electricity supplies for industrial uses the first time it had to resort to such measures in 17 years 48 Reports of the leak caused thousands of cancellations at resorts and hotels along the Sea of Japan coast even as far as Murakami Niigata 140 km northeast and Sado Island Inn owners have said that rumors have been more damaging than direct effects of the earthquake 49 The shutdown forced TEPCO to run natural gas plants in place of this plant not only increasing Japan s demand for the fuel and increasing the price internationally but also increasing carbon dioxide output such that Japan will have difficulty meeting the Kyoto Protocol Restart Edit After 16 months of comprehensive component based assessment and upgrades on all seven reactors this phase of post earthquake response was almost complete with Reactor 7 fully upgraded to cope with the seismic environment On 8 November 2008 fuel loading in reactor Unit 7 started preparatory to a period of system safety tests on that reactor 50 On 19 February 2009 TEPCO applied to the local governance to restart Unit 7 after having obtained approval from the national government and regulators 51 Local government agreement for restart was granted in May 52 and electrical grid power was supplied from Unit 7 at 20 power on 19 May 53 The reactor was raised to 100 power on 5 June 2009 as part of a series of restart tests 54 Unit 6 restarted on 26 August 2009 55 and reconnected to the grid on 31 August 56 Unit 1 restarted on 31 May 2010 57 after loading with fuel along with Unit 5 earlier in the year and was generating grid power by 6 June 2010 58 Unit 5 recommenced grid generation on 26 November 2010 in the same week that fuel loading for Unit 3 started 59 Units 2 3 and 4 were not restarted 2011 Tōhoku earthquake Edit The reactors were shut down indefinitely following the 2011 Tōhoku earthquake and tsunami Plans to restart units 6 and 7 were delayed after problems developed with the intruder detection system 60 Facility improvements after Fukushima I nuclear accidents Edit On 21 April 2011 after the Fukushima Daiichi nuclear disaster TEPCO announced a plan to build up the seawall to a height of 15 m 49 2 ft above sea level and spanning more than 800 m 2 624 ft in length for units 1 4 and more than 500 m 1 640 ft for units 5 7 by June 2013 The height of a potential tsunami was assumed to be 3 3 m Also plans were made to rebuild the radioactive overflow storage pool to be completed by September 2012 61 2011 2012 Survey on tsunamis in the past Edit On 10 November 2011 TEPCO announced a survey for signs of past tsunamis in this area With drills soil samples were to be taken of sediment layers dating from the year 1600 back to 7000 years ago at nine locations around the plant at the coast of central Japan This survey the first that TEPCO ever conducted on this subject did start on 15 November 2011 and was planned to be completed in April 2012 and was done to examine the possibility of higher tsunamis than had been expected at the time the plant was designed and built 62 On 26 April 2012 TEPCO said that it would recalculate the risks of earthquakes and tsunamis This was done after reports as published by four prefectures around the nuclear Plant re estimated the risks of potential earthquakes in the region Tottori Prefecture a 220 kilometer long fault might trigger an 8 15 magnitude earthquake Shimane Prefecture 8 01 magnitude Ishikawa Prefecture 7 99 magnitudeThe calculated earthquake magnitudes are almost three times stronger than all the calculations done by TEPCO regarding the safety assessments for the plant These were based on a magnitude 7 85 quake caused by a 131 kilometer long fault near Sado Island in Niigata and a 3 3 meter high tsunami To endure this an embankment was under construction to resist tsunami waves up to 15 meters high The recalculation could have consequences for the stress tests and safety assessments for the plant 63 After the planned revision of the safety standards in July 2013 some faults under the reactors were considered as geologically active This was found by Japanese news agency Kyodo News on 23 January 2013 in papers and other material published by TEPCO Under the new regulations geologic faults would be considered to be active if they had moved within the last 400 000 years instead of the less stringent standard of 120 000 years as was formerly accepted Two faults named Alpha and Beta are present under Reactors 1 and 2 Other faults are situated under Reactor 3 and Reactor 5 as well as underneath the building of Reactor 4 Under the new regulations the beta fault could be classified as active because it moved a ground layer including volcanic ash around 240 000 years ago The outcome of the study might trigger a second survey by the newly installed Japanese regulator NRA In January 2013 studies were conducted or planned on geological faults around six Japanese reactor sites The Kashiwazaki Kariwa plant would be number seven 64 Current Status EditKashiwazaki Kariwa is one of the 44 nuclear power plants in Japan that have been rendered inactive in the years following the Fukushima Daiichi Accident By October 2020 the Japanese government had inspected the plant and by January 2020 TEPCO had completed its improvements on Unit 7 The company outlined plans to restart the reactor as early as the end of the Japanese 2022 Fiscal year 31 March 2022 however the Nuclear Regulation Authority released a report in April 2021 indicating that there were serious security infractions and enacted an order that postponed the restart indefinitely 60 65 66 Following the April 2021 NRA report TEPCO admitted that its intruder detection system was left broken in order to reduce costs 67 and confirmed that an unauthorized personnel member used a colleague s ID card to access the plant s central control room in September 2020 In response TEPCO plans to implement anti terrorism measures install an intrusion detection system and hire an additional 30 guards to protect nuclear material at the facility The power company intends to invest 20 Billion US 165 4 Million on these security measures from 31 March 2023 to 31 March 2028 65 According to a report from TEPCO the NRA began Additional Inspection Phase II to monitor the new security measures at the plant 68 In April 2022 it was confirmed that the security flaws revealed in the NRA s April 2022 report were limited to Kashiwazaki Kariwa and not indicative of a widespread issue throughout the company s culture 69 TEPCO is planning on moving nearly 40 of their nuclear division employees to Niigata Prefecture in preparation of its plans to restart Reactor 7 and begin rebuilding trust in the citizens but the future of Kashiwazaki Kariwa is still uncertain 70 As of 26 May 2022 the local government has yet to move forward with approval for TEPCO to set forth their plans to restart 71 According to a 2021 survey by Niigata Nippo just over half of Niigata prefecture residents oppose a nuclear restart 72 See also Edit Japan portal Energy portal Nuclear technology portal Katsuhiko Ishibashi Pacific Ring of Fire List of nuclear power plants in JapanReferences Edit a b TEPCO Official Press Release Japanese First in Japan Use of the Full Area for Power Plant Buildings Reinforced Concrete R amp D and Waste Incinerator Building Archived 2011 03 21 at the Wayback Machine July 25 2002 Reuters Tepco shares slump after anti nuclear novice wins Japan election Archived 2017 10 17 at the Wayback Machine access date December 4 2016 Tepco may ask U S utility 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the original on 2013 09 28 Retrieved 2012 07 12 Profits shaken at TEPCO World Nuclear News 31 July 2007 Archived from the original on 30 September 2007 Retrieved 2007 08 01 Asahi com Quake exposes nuke plant danger Archived 2007 09 29 at the Wayback Machine July 18 2007 Quake hit Japanese nuclear plant may have experienced strongest shaking on record in world International Herald Tribune 31 July 2007 Archived from the original on 26 February 2008 Retrieved 2007 08 01 ABC News Strong Quake Rocks Northwestern Japan Archived 2007 08 21 at the Wayback Machine July 16 2007 Xinhua News Two die over 200 injured in strong quake in Japan Archived 2012 10 09 at the Wayback Machine July 16 2007 Chunichi Web 柏崎刈羽原発が緊急停止 ３号機外の変圧器で火災 Archived 2007 09 29 at archive today Japanese World Nuclear Association World Nuclear News www world nuclear news org Retrieved 2022 05 27 Nuclear plant hit by earthquake closed indefinitely in Japan Archived 2007 09 19 at the Wayback Machine Associated Press in the International Herald Tribune published 2007 07 18 accessed 2007 07 19 a b TEPCO shares dive on risk of lengthy shutdown Archived 2008 01 03 at the Wayback Machine Reuters published 2007 07 19 accessed 2007 07 19 Reuters Japan accepts IAEA inspectors after quake troubles Archived 2007 12 14 at the Wayback Machine July 22 2007 accessed July 22 2007 IAEA Team to Visit Kashiwazaki Kariwa Nuclear Power Plant Archived 2007 09 17 at the Wayback Machine IAEA published 2007 08 03 accessed 2007 08 06 Kashiwazaki Kariwa visit concludes World Nuclear News 2007 08 15 Archived from the original on 2007 09 30 Retrieved 2007 08 15 IAEA No significant damage at nuke plant 19 August 2007 Archived from the original on 6 June 2011 Retrieved 7 February 2017 via Japan Times Online Nuclear Engineering International IAEA report on Kashiwazaki Kariwa Archived 2007 09 27 at the Wayback Machine 31 August 2007 NucNet Inspections Draw To Close At Quake Hit Japan Plant Archived 2011 10 04 at the Wayback Machine July 22 2008 Follow up IAEA Report on Kashiwazaki Kariwa Nuclear Power Plant Published 26 February 2008 Archived from the original on 20 October 2014 Retrieved 7 February 2017 IAEA Fact finding Mission to Review Safety Assessment at Kashiwazaki Kariwa Nuclear Power Plant 4 November 2008 Archived from the original on 1 August 2013 Retrieved 7 February 2017 IAEA Completes Third Mission to Kashiwazaki Kariwa Nuclear Power Plant 2008 12 04 Archived from the original on 2008 12 08 Retrieved 2008 12 07 The Washington Post Earthquake Spills Water At Japanese Nuclear Plant Archived 2016 12 09 at the Wayback Machine July 17 2007 BBC News Nuclear scare after Japan quake Archived 2007 08 23 at the Wayback Machine July 16 2007 Howstuffworks com How smoke detectors work Archived 2007 07 02 at the Wayback Machine 柏崎刈羽原子力発電所６号機の放射性物質の漏えいについて TEPCOニュース 東京電力 Archived from the original on 8 February 2017 Retrieved 7 February 2017 Asahi Towels used to mop up nuke spill Archived 2007 09 29 at the Wayback Machine July 26 平成 19 年新潟県中越沖地震における東京電力 株 柏崎刈羽原子力発電所 7 号機の主排気筒からのヨウ素等の検出について 第 3 報 A press release published by Nuclear and Industrial Safety Agency METI July 20 2007 in Japanese Archived August 10 2007 at the Wayback Machine Bloomburg Tokyo Electric Shares Drop to 9 Month Low After Quake Update3 July 19 ABC News Another Radioactive Leak at Japan Plant July 20 2007 Forbes Company Japan Radioactive Leak Bigger dead link July 18 2007 accessed July 21 2007 a b NDTV com Japan Nuke plant closed indefinitely Archived 2007 09 26 at the Wayback Machine Thursday July 19 2007 accessed July 21 2007 a b International Herald Tribune Leak at Japan nuke plant blamed on failure to follow operating manual Archived 2008 02 26 at the Wayback Machine FOXNews com http www foxnews com story 0 2933 290158 00 html Archived 2007 08 26 at the Wayback Machine The detector data from the onset of the earthquake through the next day 1 Archived 2007 08 10 at the Wayback Machine Bloomberg News Tokyo Electric Shares Drop Most in 7 Years on Quake Update1 Archived 2007 09 30 at the Wayback Machine July 19 2007 The Independent Fear and fury in shadow of Japan s damaged nuclear giant Archived 2007 08 17 at the Wayback Machine July 21 2007 accessed July 21 2007 Japan s PR aftershock Nuclear Engineering International 14 September 2007 Archived from the original on 2007 10 28 Retrieved 2007 10 25 Yomiuri Tourism in Niigata on ropes N plant leaks keep droves of visitors away in summer season July 25 Fuel loading starts at Kashiwazaki Kariwa reactor Archived 2011 05 20 at the Wayback Machine 11 Nov 2008 TEPCO to seek local govts OK to restart nuke plant 23 Feb 2009 TEPCO press release on Approval of Restarting Unit No 7 Archived 2009 08 09 at the Wayback Machine 8 May 2009 TEPCO press release on Starting generation Archived 2009 08 09 at the Wayback Machine 19 May 2009 TEPCO press release on 100 power levels Archived 2009 08 09 at the Wayback Machine 5 Jun 2009 TEPCO press release on Unit 6 restart Archived 2011 03 19 at the Wayback Machine 26 Aug 2009 TEPCO press release on Unit 6 at 20 power Archived 2011 03 19 at the Wayback Machine 31 Aug 2009 Kashiwazaki Kariwa 1 restarting Archived 2010 06 05 at the Wayback Machine World Nuclear News 2 June 2010 10 Jun 2010 Status of restoration works Archived 19 March 2011 at the Wayback Machine TEPCO press release 2 Dec 2010 Status of restoration works Archived 19 March 2011 at the Wayback Machine TEPCO press release a b Nuclear Power in Japan Safety at Kashiwazaki Kariwa Remains an Issue nippon com 2021 05 14 Retrieved 2022 05 27 Yomiuri Shimbun 21 April 2011 ver 13S page 37 and 柏崎刈羽原発に防潮堤設置へ 15メートルの津波に対応 To build seawall to withstand a 15 m tsunami in Kashiwazaki Kariwa Nuclear Power Plant Sankei Shimbun in Japanese Archived from the original on 2011 04 24 Retrieved 2011 04 22 The Mainichi Daily News 11 November 2011 TEPCO to conduct drill survey at Niigata plant for evidence of tsunami Archived 2012 07 29 at archive today The Mainichi Shimbun 27 April 2012 TEPCO to recalculate potential tsunami height near Niigata nuke plant Archived 2012 07 11 at archive today The Mainichi Shimbun 24 January 2013 Quake faults at TEPCO s Niigata nuclear power plant may be active Archived 2013 01 28 at the Wayback Machine a b TEPCO to bolster security safety at flawed nuclear plant in Niigata The Asahi Shimbun Breaking News Japan News and Analysis The Asahi Shimbun Retrieved 2022 05 27 EDITORIAL TEPCO execs keep heads in the sand on nuclear security issue The Asahi Shimbun Breaking News Japan News and Analysis The Asahi Shimbun Retrieved 2022 05 27 Japan s nuclear regulator inspects Tepco s Kashiwazaki Kariwa plant The Japan Times 2021 10 26 Retrieved 2022 05 27 Overview of 2021FY 3rd Quarter Financial Results PDF Report Japan 31 January 2022 pp 26 30 Retrieved 27 May 2022 a href Template Cite report html title Template Cite report cite report a CS1 maint url status link Issues Unique to Kashiwazaki Kariwa Plant behind Flaws NRA nippon com 2022 04 27 Retrieved 2022 05 27 TEPCO to bolster security safety at flawed nuclear plant in Niigata The Asahi Shimbun Breaking News Japan News and Analysis The Asahi Shimbun Retrieved 2022 05 28 Komiya Kantaro Takemoto Yoshifumi 2022 05 27 In home of world s biggest nuclear plant a vote may shape Japan s atomic future Reuters Retrieved 2022 05 28 Hida Hikari Rich Motoko 6 May 2022 Japan Says It Needs Nuclear Power Can Host Towns Ever Trust It Again New York Times Archived from the original on 11 May 2022 Retrieved 4 June 2022 External links Edit Wikimedia Commons has media related to Kashiwazaki Kariwa Nuclear Power Plant Niigata Chuetsu Offshore earthquake Edit Niigata Chuetsu Offshore Earthquake impacts Japan Atomic Industrial Forum Earthquake impacts Japan Nuclear Technology Institute View on earthquake events Japan s Nuclear Safety Commission Chairman s statement Kashiwazaki Kariwa Earthquake Japan s Citizens Nuclear Information Center Report Kashiwazaki nuclear plant report from the scene Greenpeace Insight Where not to build nuclear power stations New Scientist Japan s Quake Prone Atomic Plant Prompts Wider Worry The New York TimesEntire plant Edit Tokyo Electric Company Official Site for Kashiwazaki Kariwa 東京電力 柏崎刈羽原子力発電所 in Japanese Power plant on line monitor in Japanese This shows output power click on icons at top left to see three different radiation monitors Nuclear TEPCO Power Plants in English List of events at the plant in English Retrieved from https en wikipedia org w index php title Kashiwazaki Kariwa Nuclear Power Plant amp oldid 1119430246, wikipedia, wiki, book, books, library,

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