Nuclear power in Japan
Prior to the earthquake and tsunami of March 2011, and the nuclear disasters that resulted from it, Japan generated 30% of its electrical power from nuclear reactors and planned to increase that share to 40%. Nuclear energy was a national strategic priority in Japan, but there had been concern about the ability of Japan's nuclear plants to withstand seismic activity. The Kashiwazaki-Kariwa Nuclear Power Plant was completely shut down for 21 months following an earthquake in 2007.
The 2011 earthquake and tsunami caused the failure of cooling systems at the Fukushima I Nuclear Power Plant on March 11 and a nuclear emergency was declared. This was the first time a nuclear emergency had been declared in Japan, and 140,000 residents within 20 km of the plant were evacuated. The total amount of radioactive material released is unclear, as the crisis is ongoing. On 6 May 2011, Prime Minister Naoto Kan ordered the Hamaoka Nuclear Power Plant be shut down as an earthquake of magnitude 8.0 or higher is likely to hit the area within the next 30 years.
Problems in stabilizing the Fukushima I nuclear plant had hardened attitudes to nuclear power. As of June 2011, "more than 80 percent of Japanese now say they are anti-nuclear and distrust government information on radiation". As of October 2011, there have been electricity shortages, but Japan survived the summer without the extensive blackouts that had been predicted. An energy white paper, approved by the Japanese Cabinet in October 2011, says "public confidence in safety of nuclear power was greatly damaged" by the Fukushima disaster, and calls for a reduction in the nation’s reliance on nuclear power.
Many of Japan's nuclear plants have been closed, or their operation has been suspended for safety inspections. The last of Japan's 50 reactors (Tomari-3) went offline for maintenance on May 5, 2012., leaving Japan completely without nuclear-produced electrical power for the first time since 1970. Despite protests, on 1 July 2012 unit 3 of the Ōi Nuclear Power Plant was restarted. As of September 2012, Ōi units 3 and 4 are Japan's only operating nuclear power plants, although the city and prefecture of Osaka have requested they be shut down.
In 1954, Japan budgeted 230 million yen for nuclear energy, marking the beginning of the program. The Atomic Energy Basic Law limited activities to only peaceful purposes. The first nuclear reactor in Japan was built by the UK's GEC and was commissioned in 1966. In the 1970s, the first light water reactors were built in cooperation with American companies. These plants were bought from U.S. vendors such as General Electric and Westinghouse with contractual work done by Japanese companies, who would later get a license themselves to build similar plant designs. Developments in nuclear power since that time have seen contributions from Japanese companies and research institutes on the same level as the other big users of nuclear power.
Robert Jay Lifton has asked how Japan, after its experience with the atomic bombings of Hiroshima and Nagasaki, could "allow itself to draw so heavily on the same nuclear technology for the manufacture of about a third of its energy". He says:
There was resistance, much of it from Hiroshima and Nagasaki survivors. But there was also a pattern of denial, cover-up and cozy bureaucratic collusion between industry and government, the last especially notorious in Japan but by no means limited to that country. Even then, pro-nuclear power forces could prevail only by managing to instill in the minds of Japanese people a dichotomy between the physics of nuclear power and that of nuclear weapons, an illusory distinction made not only in Japan but throughout the world.
Japan's nuclear industry was not hit as hard by the effects of the Three Mile Island accident (TMI) or the Chernobyl disaster as some other countries. Construction of new plants continued to be strong through the 1980s, 1990s, and up to the present day. While many new plants had been proposed, all were subsequently canceled or never brought past initial planning. Canceled plant orders include:
- The Maki Nuclear Power Plant at Maki, Niigata (Kambara)—Canceled in 2003
- The Kushima Nuclear Power Plant at Kushima, Miyazaki—1997
- The Ashihama Nuclear Power Plant at Ashihama, Mie—2000 (the first Project at the site in the 1970s was completed at Hamaoka as Unit 1&2)
- The Hōhoku Nuclear Power Plant at Hōhoku, Yamaguchi—1994
- The Suzu Nuclear Power Plant at Suzu, Ishikawa—2003
However, starting in the mid-1990s there were several nuclear related accidents and cover-ups in Japan that eroded public perception of the industry, resulting in protests and resistance to new plants. These accidents included the Tokaimura nuclear accident, the Mihama steam explosion, cover-ups after an accidents at the Monju reactor, among others, more recently the Chūetsu offshore earthquake aftermath. While exact details may be in dispute, it is clear that the safety culture in Japan's nuclear industry has come under greater scrutiny.
On April 18, 2007, Japan and the United States signed the United States-Japan Joint Nuclear Energy Action Plan, aimed at putting in place a framework for the joint research and development of nuclear energy technology. Each country will conduct research into fast reactor technology, fuel cycle technology, advanced computer simulation and modeling, small and medium reactors, safeguards and physical protection; and nuclear waste management. In March 2008, Tokyo Electric Power Company announced that the start of operation of four new nuclear power reactors would be postponed by one year due to the incorporation of new earthquake resistance assessments. Units 7 and 8 of the Fukushima Daiichi plant would now enter commercial operation in October 2014 and October 2015, respectively. Unit 1 of the Higashidori plant is now scheduled to begin operating in December 2015, while unit 2 will start up in 2018 at the earliest. As of September 2008, Japanese ministries and agencies were seeking an increase in the 2009 budget by 6%. The total requested comes to 491.4 billion Japanese yen (4.6 billion USD), and the focuses of research are development of the fast breeder reactor cycle, next-generation light water reactors, the Iter project, and seismic safety.
A 2011 independent investigation in Japan has "revealed a long history of nuclear power companies conspiring with governments to manipulate public opinion in favour of nuclear energy". One nuclear company "even stacked public meetings with its own employees who posed as ordinary citizens to speak in support of nuclear power plants". An energy white paper, approved by the Japanese Cabinet in October 2011, says "public confidence in safety of nuclear power was greatly damaged" by the Fukushima disaster, and calls for a reduction in the nation’s reliance on nuclear power. It also omits a section on nuclear power expansion that was in last year’s policy review. Nuclear Safety Commission Chairman Haruki Madarame told a parliamentary inquiry in February 2012 that "Japan's atomic safety rules are inferior to global standards and left the country unprepared for the Fukushima nuclear disaster last March". There were flaws in, and lax enforcement of, the safety rules governing Japanese nuclear power companies, and this included insufficient protection against tsunamis.
As of 27 March 2012, Japan had only one out of 54 nuclear reactors operating; the Tomari-3, after the Kashiwazaki-Kariwa 6 was shut down. The Tomari-3 was shut down for maintenance on 5 May, leaving Japan with no nuclear-derived electricity for the first time since 1970, when the country's then only two reactors was taken offline five days for maintenance. On 15 June 2012, approval was given to restart Ohi Units 3 and 4 which could take six weeks to bring them to full operation. On 1 July 2012 unit 3 of the Ōi Nuclear Power Plant was restarted. This reactor can provide 1,180 MW of electricity. On 21 July 2012 unit 4 was restarted, also 1,180 MW.
The National Diet of Japan Fukushima Nuclear Accident Independent Investigation Commission (NAIIC) is the first independent investigation commission by the National Diet in the 66-year history of Japan’s constitutional government. NAICC was established on December 8, 2011 with the mission to investigate the direct and indirect causes of the Fukushima nuclear accident. NAICC submitted its inquiry report to both houses on July 5, 2012.[a] The 10-member commission compiled its report based on more than 1,167 interviews and 900 hours of hearings. It was a six-month independent investigation, the first of its kind with wide-ranging subpoena powers in Japan's constitutional history, which held public hearings with former Prime Minister Naoto Kan and Tokyo Electric Power Co's former president Masataka Shimizu, who gave conflicting accounts of the disaster response. The commission chairman, Kiyoshi Kurokawa, declared with respect to the Fukushima nuclear incident: “It was a profoundly man-made disaster — that could and should have been foreseen and prevented.” He added that the "fundamental causes" of the disaster were rooted in "the ingrained conventions of Japanese culture." The report outlines errors and willful negligence at the plant before the 2011 Tōhoku earthquake and tsunami on March 11, 2011 and a flawed response in the hours, days and weeks that followed. It also offers recommendations and encourages Japan's parliament to "thoroughly debate and deliberate" the suggestions.
Japan has had a long history of earthquakes and seismic activity, and destructive earthquakes, often resulting in tsunamis, occur several times a century. Due to this, concern has been expressed about the particular risks of constructing and operating nuclear power plants in Japan. Amory Lovins has said: "An earthquake-and-tsunami zone crowded with 127 million people is an un-wise place for 54 reactors". To date, the most serious seismic-related accident has been the Fukushima Daiichi nuclear disaster, following the 2011 Tōhoku earthquake and tsunami.
Professor Katsuhiko Ishibashi, one of the seismologists who have taken an active interest in the topic, coined the term genpatsu-shinsai (原発震災), from the Japanese words for "nuclear power" and "quake disaster" to express the potential worst-case catastrophe that could ensue. Dr Kiyoo Mogi, former chair of the Japanese Coordinating Committee for Earthquake Prediction, has expressed similar concerns, stating in 2004 that the issue 'is a critical problem which can bring a catastrophe to Japan through a man-made disaster'.
Warnings from Kunihiko Shimazaki, a professor of seismology at the University of Tokyo, were also ignored. In 2004, as a member of an influential cabinet office committee on offshore earthquakes, Mr. Shimazaki "warned that Fukushima's coast was vulnerable to tsunamis more than twice as tall as the forecasts of as much as five meters put forth by regulators and Tokyo Electric". Minutes of the meeting on Feb. 19, 2004, show that the government bureaucrats running the committee moved quickly to exclude his views from the committee's final report. He said the committee did not want to force Tokyo Electric to make expensive upgrades at the plant.
Hidekatsu Yoshii, a member of the House of Representatives for Japanese Communist Party and an anti-nuclear campaigner, warned in March and October 2006 about the possibility of the severe damage that might be caused by a tsunami or earthquake. During a parliamentary committee in May 2010 he made similar claims, warning that the cooling systems of a Japanese nuclear plant could be destroyed by a landslide or earthquake. In response Yoshinobu Terasaka, head of the Nuclear and Industrial Safety Agency, replied that the plants were so well designed that "such a situation is practically impossible". Following damage at the Kashiwazaki-Kariwa Nuclear Power Plant due to the 2007 Chūetsu offshore earthquake, Kiyoo Mogi called for the immediate closure of the Hamaoka Nuclear Power Plant, which was knowingly built close to the centre of the expected Tōkai earthquake. Katsuhiko Ishibashi previously claimed, in 2004, that Hamaoka was "considered to be the most dangerous nuclear power plant in Japan".
The International Atomic Energy Agency (IAEA) has also expressed concern. At a meeting of the G8's Nuclear Safety and Security Group, held in Tokyo in 2008, an IAEA expert warned that a strong earthquake with a magnitude above 7.0 could pose a 'serious problem' for Japan's nuclear power stations. Before Fukushima, "14 lawsuits charging that risks had been ignored or hidden were filed in Japan, revealing a disturbing pattern in which operators underestimated or hid seismic dangers to avoid costly upgrades and keep operating. But all the lawsuits were unsuccessful". Underscoring the risks facing Japan, a 2012 research institute investigation has "determined there is a 70% chance of a magnitude-7 earthquake striking the Tokyo metropolitan area within the next four years, and 98% over 30 years". The March 2011 earthquake was a magnitude-9.
Between 2005 and 2007, three Japanese nuclear power plants were shaken by earthquakes that far exceeded the maximum peak ground acceleration used in their design. The tsunami that followed the 2011 Tōhoku earthquake, inundating the Fukushima I Nuclear Power Plant, was more than twice the design height, while the ground acceleration also slightly exceeded the design parameters.
In 2006 a Japanese government subcommittee was charged with revising the national guidelines on the earthquake-resistance of nuclear power plants, which had last been partially revised in 2001, resulting in the publication of a new seismic guide — the 2006 Regulatory Guide for Reviewing Seismic Design of Nuclear Power Reactor Facilities. The subcommittee membership included Professor Ishibashi, however his proposal that the standards for surveying active faults should be reviewed was rejected and he resigned at the final meeting, claiming that the review process was 'unscientific' and the outcome rigged to suit the interests of the Japan Electric Association, which had 11 of its committee members on the 19-member government subcommittee. Ishibashi has subsequently claimed that, although the new guide brought in the most far-reaching changes since 1978, it was 'seriously flawed' because it underestimated the design basis earthquake ground motion. He has also claimed that the enforcement system is 'a shambles' and questioned the independence of the Nuclear Safety Commission after a senior Nuclear and Industrial Safety Agency official appeared to rule out a new review of the NSC's seismic design guide in 2007.
Following publication of the new 2006 Seismic Guide, the Nuclear and Industrial Safety Agency, at the request of the Nuclear Safety Commission, required the design of all existing nuclear power plants to be re-evaluated.
The standard of geological survey work in Japan is another area causing concern. In 2008 Taku Komatsubara, a geologist at the National Institute of Advanced Industrial Science and Technology alleged that that the presence of active faults was deliberately ignored when surveys of potential new power plant sites were undertaken, a view supported by a former topographer. Takashi Nakata, a seismologist from the Hiroshima Institute of Technology has made similar allegations, and suggest that conflicts of interest between the Japanese nuclear industry and the regulators contribute to the problem.
A 2011 Natural Resources Defense Council report that evaluated the seismic hazard to reactors worldwide, as determined by the Global Seismic Hazard Assessment Program data, placed 35 of Japan's reactors in the group of 48 reactors worldwide in very high and high seismic hazard areas.
Nuclear power plants
Following the Fukushima I nuclear accidents Prime Minister Naoto Kan has announced that all 6 of the reactors at the Fukushima I Nuclear Power Plant will be decommissioned. The plant operators had previously stated that reactors 1 to 4 would never operate again. For a list of nuclear reactors in Japan, see List of nuclear reactors.
In terms of consequences of radiation release and core damage the Fukushima I nuclear accidents in 2011 were the worst experienced by the industry in addition to ranking among the worst civilian nuclear accidents, though no fatalities were caused and no serious exposure of radiation to workers occurred. The Tokaimura reprocessing plant fire in 1999 had 2 worker deaths, one more exposed to radiation levels above legal limits and over 660 others received detectable radiation doses but below permissible levels, well below the threshold to affect human health. The Mihama Nuclear Power Plant experienced a steam explosion in one of the turbine buildings in 2004 where 4 workers were killed and seven others injured.
Fukushima Daiichi nuclear disaster
According to the Federation of Electric Power Companies of Japan, "by April 27 approximately 55 percent of the fuel in reactor unit 1 had melted, along with 35 percent of the fuel in unit 2, and 30 percent of the fuel in unit 3; and overheated spent fuels in the storage pools of units 3 and 4 probably were also damaged". The accident exceeds the 1979 Three Mile Island accident in seriousness, and is comparable to the 1986 Chernobyl disaster. The Economist reports that the Fukushima disaster is "a bit like three Three Mile Islands in a row, with added damage in the spent-fuel stores", and that there will be ongoing impacts:
Years of clean-up will drag into decades. A permanent exclusion zone could end up stretching beyond the plant’s perimeter. Seriously exposed workers may be at increased risk of cancers for the rest of their lives...
On March 24, 2011, Japanese officials announced that "radioactive iodine-131 exceeding safety limits for infants had been detected at 18 water-purification plants in Tokyo and five other prefectures". Officials said also that the fallout from the Dai-ichi plant is "hindering search efforts for victims from the March 11 earthquake and tsunami".
Problems in stabilizing the Fukushima Daiichi nuclear power plant have hardened attitudes to nuclear power. As of June 2011, "more than 80 percent of Japanese now say they are anti-nuclear and distrust government information on radiation". The ongoing Fukushima crisis may spell the end of nuclear power in Japan, as "citizen opposition grows and local authorities refuse permission to restart reactors that have undergone safety checks". Local authorities are skeptical that sufficient safety measures have been taken and are reticent to give their permission – now required by law – to bring suspended nuclear reactors back online.
Two government advisers have said that "Japan's safety review of nuclear reactors after the Fukushima disaster is based on faulty criteria and many people involved have conflicts of interest". Hiromitsu Ino, Professor Emeritus at the University of Tokyo, says "The whole process being undertaken is exactly the same as that used previous to the Fukushima Dai-Ichi accident, even though the accident showed all these guidelines and categories to be insufficient".
In 2012, former prime minister Naoto Kan was interviewed about the Fukushima nuclear disaster, and has said that at one point Japan faced a situation where there was a chance that people might not be able to live in the capital zone including Tokyo and would have to evacuate. He says he is haunted by the specter of an even bigger nuclear crisis forcing tens of millions of people to flee Tokyo and threatening the nation's existence. "If things had reached that level, not only would the public have had to face hardships but Japan's very existence would have been in peril". That convinced Kan to "declare the need for Japan to end its reliance on atomic power and promote renewable sources of energy such solar that have long taken a back seat in the resource-poor country's energy mix".
Other accidents of note include:
- 1981: almost 300 workers were exposed to excessive levels of radiation after a fuel rod ruptured during repairs at the Tsuruga Nuclear Power Plant.
- December 1995: the fast breeder Monju Nuclear Power Plant sodium leak. State-run operator Donen was found to have concealed videotape footage that showed extensive damage to the reactor.
- March 1997: the Tokaimura nuclear reprocessing plant fire and explosion, northeast of Tokyo. 37 workers were exposed to low doses of radiation. Donen later acknowledged it had initially suppressed information about the fire.
- 1999: a fuel loading system malfunctioned at a nuclear plant in the Fukui Prefecture and set off an uncontrolled nuclear reaction and explosion.
- September 1999: the criticality accident at the Tokai fuel fabrication facility. Hundreds of people were exposed to radiation, three workers received doses above legal limits of whom two later died.
- 2000: Three Tokyo Electric Power Co. executives were forced to quit after the company in 1989 ordered an employee to edit out footage showing cracks in nuclear plant steam pipes in video being submitted to regulators.
- August 2002: a widespread falsification scandal starting in that led to the shut down of all Tokyo Electric Power Company’s 17 nuclear reactors; Tokyo Electric's officials had falsified inspection records and attempted to hide cracks in reactor vessel shrouds in 13 of its 17 units.
- 2002: Two workers were exposed to a small amount of radiation and suffered minor burns during a fire at Onagawa Nuclear Power Station in northern Japan.
- 9 August 2004: four workers were killed after a steam explosion at the Mihama-3 station; the subsequent investigation revealed a serious lack in systematic inspection in Japanese nuclear plants, which led to a massive inspection program.
- 2006: A small amount of radioactive steam was released at the Fukushima Dai-ichi plant and it escaped the compound.
- 16 July 2007: a severe earthquake (measuring 6.8 on the Richter scale) hit the region where Tokyo Electric's Kashiwazaki-Kariwa Nuclear Power Plant is located and radioactive water spilled into the Sea of Japan; as of March 2009, all of the reactors remain shut down for damage verification and repairs; the plant with seven units was the largest single nuclear power station in the world.
Nuclear organizations in Japan
- Nuclear Safety Commission 原子力安全委員会 - The Japanese regulatory body for the nuclear industry.
- Japanese Atomic Energy Commission (AEC) 原子力委員会 - Now operating as a commission of inquiry to the Japanese cabinet, this organization coordinates the entire nation's plans in the area of nuclear energy.
- Nuclear and Industrial Safety Agency (NISA) 原子力安全・保安院 - The NISA performs regulatory activities and was formed January 6, 2001, after a reorganization of governmental agencies.
These organizations are government funded research organizations, though many of them have special status to give them power of administration separate from the Japanese government. Their origins date back to the Atomic Energy Basic Law, but they have been reorganized several times since their inception.
- Japan Atomic Energy Research Institute (JAERI) - 日本原子力研究所
- The original nuclear energy research organization established by the Japanese government under cooperation with U.S. partners.
- Atomic Fuel Corporation - 原子燃料公社
- This organization was formed along with JAERI under the Atomic Energy Basic Law and was later reorganized to be PNC.
- Power Reactor and Nuclear Fuel Development Corporation (PNC) - 動力炉・核燃料開発事業団
- This organization succeeded the AFC in 1967 in order to perform more direct construction of experimental nuclear plants, and was renamed JNC in 1998.
- Japan Nuclear Cycle Development Institute (JNC) - 核燃料サイクル開発機構 (semi-governmental agency)
- Was formed in 1998 as the direct successor to the PNC. This organization operated Lojo and Monju experimental and demonstration reactors.
- Japan Atomic Energy Agency (JAEA) - 日本原子力研究開発機構
- This is the modern, currently operating primary nuclear research organization in Japan. It was formed by a merger of JAERI and JNC in 2005.
Electric utilities running nuclear plants
Japan is divided into a number of regions that each get electric service from their respective regional provider, all utilities hold a monopoly and are strictly regulated by the Japanese government. For more background information see Energy in Japan. All regional utilities in Japan currently operate nuclear plants with the exception of the Okinawa Electric Power Company. They are also all members of the Federation of Electric Power Companies (FEPCO) industry organization. The companies are listed below.
- Regional electric providers
- Hokkaidō Electric Power Company (HEPCO) - 北海道電力
- Tōhoku Electric Power Company (Tōhoku Electric) - 東北電力
- Tokyo Electric Power Company (TEPCO) - 東京電力
- Chūbu Electric Power Company (CHUDEN) - 中部電力
- Hokuriku Electric Power Company (RIKUDEN) - 北陸電力
- Kansai Electric Power Company (KEPCO) - 関西電力
- Chūgoku Electric Power Company (Energia) - 中国電力
- Shikoku Electric Power Company (YONDEN) - 四国電力
- Kyūshū Electric Power Company (Kyūshū Electric) - 九州電力
- Other companies with a stake in nuclear power
- JAPC was created by special provisions from the Japanese government to be the first company in Japan to run a nuclear plant. Today it still operates two separate sites.
- Electric Power Development Company (EDPC, J-POWER) - 電源開発
- This company was created by a special law after the end of World War II, it operates a number of coal fired, hydroelectric, and wind power plants, the Ohma nuclear plant that is under construction will mark its entrance to the industry upon completion.
Nuclear vendors and fuel cycle companies
Nuclear vendors provide fuel in its fabricated form, ready to be loaded in the reactor, nuclear services, and/or manage construction of new nuclear plants. The following is an incomplete list of companies based in Japan that provide such services. The companies listed here provide fuel or services for commercial light water plants, and in addition to this, JAEA has a small MOX fuel fabrication plant. Japan operates a robust nuclear fuel cycle.
- Nuclear Fuel Industries (NFI) - 原子燃料工業
- Japan Nuclear Fuel Limited (JNFL, JNF) - 日本原燃
- The shareholders of JNFL are the Japanese utilities. JNFL plans to open a full scale enrichment facility in Rokkasho, Aomori with a capacity of 1.5 million SWU/yr along with a MOX fuel fabrication facility. JNFL has also operated a nuclear fuel fabrication facility called Kurihama Nuclear Fuel Plant in Yokosuka, Kanagawa as GNF, producing BWR fuel.
- MHI operates a fuel manufacturing plant in Tōkai, Ibaraki, and contributes many heavy industry components to construction of new nuclear plants, and has recently designed its own APWR plant type, fuel fabrication has been completely PWR fuel, though MHI sells components to BWRs as well. It was selected by the Japanese government to develop fast breeder reactor technology and formed Mitsubishi FBR Systems. MHI has also announced an alliance with Areva to form a new company called Atmea.
- Global Nuclear Fuel (GNF)
- GE Hitachi Nuclear Energy (GEH) - 日立GEニュークリア・エナジー
- This company was formed July 1, 2007. Its next generation reactor, the ESBWR has made significant progress with US regulators, and as of July 2007, has been submitted to English regulators as well for the generic design assessment (GDA) process.
- Toshiba - 東芝 電力システム社 原子力事業部
- Toshiba has maintained a large nuclear business focused mostly on Boiling Water Reactors. With the purchase of the American Westinghouse by 5.4 Billion USD in 2006, which is focused mainly on Pressurized Water Reactor technology, it increased the size of its nuclear business about two fold. Toshiba has plans to continue significant expansion in the next decade.
- Recyclable-Fuel Storage Co.
- Japan Atomic Industrial Forum (JAIF) 日本原子力産業協会 is a non-profit organization, established in 1956 to promote the peaceful use of atomic energy.
- The Atomic Energy Society of Japan (AESJ) 日本原子力学会 is a major academic organization in Japan focusing on all forms of nuclear power. The Journal of Nuclear Science and Technology is the academic journal run by the AESJ. It publishes English and Japanese articles, though most submissions are from Japanese research institutes, universities, and companies.
- Japan Nuclear Technology Institute (JANTI) 日本原子力技術協会 was established to by the nuclear power industry to support and lead that industry.
- Japan Electric Association (JEA) 日本電気協会 develops and publishes codes and guides for the Japanese nuclear power industry and is active in promoting nuclear power.
Other proprietary organizations
- Established in 1978 as by Sumimoto Metal Mining Co. this company did work with Uranium conversion and set up factories at the Tokai-mura site. Later, it was held solely responsible for the Tokaimura nuclear accident
Long one of the world’s most committed promoters of civilian nuclear power, the negative impact of the 2011 Fukushima nuclear disaster has changed attitudes in Japan. Political and energy experts describe "nothing short of a nationwide loss of faith, not only in Japan’s once-vaunted nuclear technology but also in the government, which many blame for allowing the accident to happen". Sixty thousand people marched in central Tokyo on 19 September 2011, chanting "Sayonara nuclear power" and waving banners, to call on Japan's government to abandon nuclear power, following the Fukushima disaster. Bishop of Osaka, Michael Goro Matsuura, has called on the solidarity of Christians worldwide to support this anti-nuclear campaign. In July 2012, 75,000 people gathered near in Tokyo for the capital’s largest anti-nuclear event yet. Organizers and participants said such demonstrations signal a fundamental change in attitudes in a nation where relatively few have been willing to engage in political protests since the 1960s.
Anti-nuclear groups include the Citizens' Nuclear Information Center, Stop Rokkasho, Hidankyo, Sayonara Nuclear Power Plants, Women from Fukushima Against Nukes, Article 9 group, and the National Network of Parents to Protect Children from Radiation. People associated with the anti-nuclear movement include: Jinzaburo Takagi, Koide Hiroaki, Haruki Murakami, Kenzaburō Ōe, Nobuto Hosaka, Mizuho Fukushima, and Tetsunari Iida.
Thousands of protesters marched in Tokyo on March 11, 2013 calling on the government to reject nuclear power.  More than 30,000 people marched on June 2 near the Diet building in Tokyo against the government's plan to restart nuclear power plants. Marchers had gathered more than 8 million signatures in a petition against Japan's plan to restart nuclear power plants.
- Energy in Japan
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- Japanese nuclear weapons program
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