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 Fukushima Daiichi nuclear power plant is located in Fukushima Prefecture Japan, 250km from Tokyo.It is the Tokyo Electric Power Company's first nuclear power. There are six units plant, total generating capacity of 4.7 GWE. It is one of the world's largest power plant generating capacity. The first unit started to operation in 1971.

On 2011 11th of March there was a big earthquake and tsunami that damaged the nuclear power plants and it exploded. it hindered oversea assistance. After a few hours to a few days, No1,2,3 reactor core dissolved and destroyed. The Government of Japan announced an Emergency nuclear disaster on March 11 and an evacuation of 170,000 people who lived nearby Fukushima Prefecture to avoid the release of radiation outside the health damage caused. International Atomic Energy Agency has defined this is level 6 nuclear disaster. It is called the Fukushima Daiichi nuclear power plant accident. It is the most serious nuclear accident after 1986 the Chernobyl nuclear power plant accident.

Before the Fukushima Daiichi nuclear power plant accident, there were somethings happen in TEPCO. During the end of 2002 through 2005, the reactors were among those shut down in a time for safety checks during the TEPCO data falsification scandal . On Feb 28, 2011 TEPCO submitted a report to the Japanese Nuclear and Industrial Safety Agency admitting that the company had previously submitted fake inspection and repair reports. After the Fukushima Daiichi nuclear power plant accident, the disaster disabled the reactor cooling systems that leading to releases of radioactivity and triggering in 30 km evacuation zone surrounding the plant. Because the local fishermen and nuclear watchdog agency experts had suspected that the problem will occur but the Tokyo Electric Power Company denied the existence of this problem. but the Japanese Prime Minister Shinzo Abe ordered the government to intervene to deal with this urgent problem.

July 22, 2013, Tokyo Electric Power said that nuclear power plant is leaking radioactive wastewater into the Pacific Ocean, On August 7, 2013, Japanese officials said highly radioactive water was leaking from Fukushima Daiichi into the Pacific Ocean about 272 metric tons per day. This wastewater is sufficient for the health of employees working near hazardous. The sewage leakage accident was awarded the International Nuclear Event Scale (INES) in level third.

Fukushima nuclear accident have led to a more measured trace radioactive substances, including iodine-131, cesium-137 in the world.

 a large number of radioisotope nuclear accident released into the Pacific Ocean. a large number of radioactive substances have been released into the land and the sea. it will affect half-life 30 years.  The government banned the sale of food produced in this region. Tokyo government officials recommended avoid using tap water to the baby food diet modulation.

Some experts think that it was a super-disaster exceeding  the expected over than  the risk engineers design Some scholars believe that nuclear power plants are forced to use water as a coolant, but the water will corrode nuclear fuel rods, the formation of clusters with uranium, a cluster but it is transferred to the sea, you can not long survive in nearby waters, make the nuclear contamination problem becomes more severe.