2011 Fukushima Daiichi nuclear disaster

2011 Fukushima Daiichi nuclear disaster was a catastrophic nuclear accident that occurred at the Fukushima Daiichi Nuclear Power Plant, operated by Tokyo Electric Power Company (TEPCO), located in Fukushima Prefecture, Japan. The disaster was triggered by the 2011 Tōhoku earthquake and tsunami, which caused widespread damage to the plant's cooling systems, leading to a series of equipment failures and radioactive material releases. The incident involved the United States Nuclear Regulatory Commission (NRC), International Atomic Energy Agency (IAEA), and World Health Organization (WHO), among other organizations. The disaster was closely monitored by Japanese Prime Minister Naoto Kan, United States Secretary of Energy Steven Chu, and French President Nicolas Sarkozy.

Background

The Fukushima Daiichi Nuclear Power Plant was a nuclear power plant located on the coast of Fukushima Prefecture, Japan, and was operated by Tokyo Electric Power Company (TEPCO). The plant consisted of six boiling water reactors (BWRs), designed by General Electric (GE) and built by Toshiba and Hitachi. The plant was commissioned in the 1970s, with the first reactor starting operation in 1971, and was one of the largest nuclear power plants in the world, with a total capacity of 4,696 MW. The plant was regulated by the Japanese Ministry of Economy, Trade and Industry (METI), and was subject to regular inspections by the Nuclear and Industrial Safety Agency (NISA) and the International Atomic Energy Agency (IAEA). The plant's safety was also reviewed by the United States Nuclear Regulatory Commission (NRC), and the European Nuclear Safety Regulatory Group (ENSREG).

Causes and development

The 2011 Tōhoku earthquake and tsunami occurred on March 11, 2011, and was one of the largest earthquakes in Japanese history, with a magnitude of 9.0 on the Richter scale. The earthquake triggered a massive tsunami that hit the coast of Fukushima Prefecture, causing widespread damage to the Fukushima Daiichi Nuclear Power Plant. The tsunami waves exceeded the plant's seawall, flooding the backup power systems and causing a loss of power to the cooling systems. The loss of power led to a series of equipment failures, including the failure of the emergency core cooling system (ECCS), and the release of radioactive materials into the environment. The incident was closely monitored by the Japanese Prime Minister Naoto Kan, United States Secretary of Energy Steven Chu, and French President Nicolas Sarkozy, who were in contact with the International Atomic Energy Agency (IAEA), and the World Health Organization (WHO). The United States Nuclear Regulatory Commission (NRC), and the European Nuclear Safety Regulatory Group (ENSREG), also provided assistance and guidance during the crisis.

Release of radioactive materials

The release of radioactive materials from the Fukushima Daiichi Nuclear Power Plant was a major concern during the crisis, with large quantities of iodine-131, cesium-137, and strontium-90 being released into the environment. The releases were caused by the failure of the cooling systems, and the subsequent melting of the nuclear fuel in the reactors. The radioactive materials were released into the air, and contaminated a large area around the plant, including the Fukushima Prefecture, and the neighboring Miyagi Prefecture, and Ibaraki Prefecture. The releases were monitored by the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT), and the United States Environmental Protection Agency (EPA), which provided assistance and guidance during the crisis. The World Health Organization (WHO), and the International Atomic Energy Agency (IAEA), also provided guidance on the health effects of the releases, and the necessary measures to protect the public.

Response and containment

The response to the crisis was led by the Japanese government, with the Japanese Prime Minister Naoto Kan playing a key role in coordinating the response efforts. The Tokyo Electric Power Company (TEPCO), which operated the plant, was also involved in the response efforts, with the assistance of the United States Nuclear Regulatory Commission (NRC), and the International Atomic Energy Agency (IAEA). The response efforts included the injection of seawater into the reactors to cool them down, and the construction of a containment structure to prevent the release of radioactive materials into the environment. The French nuclear company Areva also provided assistance, including the supply of boron to absorb the neutrons and prevent a nuclear chain reaction. The United States Department of Energy (DOE), and the European Commission also provided assistance and guidance during the crisis.

Health and environmental impact

The health and environmental impact of the disaster was a major concern, with the release of radioactive materials into the environment posing a risk to the public and the environment. The World Health Organization (WHO), and the International Atomic Energy Agency (IAEA), provided guidance on the health effects of the releases, and the necessary measures to protect the public. The Japanese government also implemented measures to protect the public, including the evacuation of the area around the plant, and the distribution of iodine tablets to prevent the uptake of radioactive iodine by the thyroid gland. The United States Environmental Protection Agency (EPA), and the European Environment Agency (EEA), also monitored the environmental impact of the disaster, and provided guidance on the necessary measures to protect the environment. The Food and Agriculture Organization (FAO), and the World Organization for Animal Health (OIE), also provided guidance on the impact of the disaster on the food chain, and the necessary measures to protect animal and human health.

Aftermath and decommissioning

The aftermath of the disaster saw a major effort to decommission the plant, and to prevent any further releases of radioactive materials into the environment. The Tokyo Electric Power Company (TEPCO), with the assistance of the Japanese government, and the International Atomic Energy Agency (IAEA), implemented a number of measures to stabilize the plant, and to prevent any further accidents. The United States Department of Energy (DOE), and the European Commission also provided assistance and guidance during the decommissioning process. The Fukushima Daiichi Nuclear Power Plant is expected to take several decades to decommission, with the removal of the nuclear fuel and the demolition of the plant's structures. The Japanese government has also implemented measures to support the affected communities, including the provision of compensation to those who were evacuated, and the implementation of measures to revitalize the local economy. The International Atomic Energy Agency (IAEA), and the World Health Organization (WHO), continue to monitor the situation, and provide guidance and assistance as needed. Category:Nuclear accidents