Now the three examples, Chernobyl, Fukushima, Three Thousand Islands, show the effect of the nuclear accident. Each has different causes, but the damage was terrible. Chernobyl disaster Brief description On April 26, 1986, the Chernobyl nuclear power plant in Ukraine exploded. At 1:23 a.m., while everyone was asleep, reactor #4 exploded, and 40 hours later, all residences in the city were forcibly moved to other cities, and they never returned home. they. The Chernobyl disaster is considered the worst nuclear accident. The Chernobyl nuclear power plant was managed by the Central Nuclear Energy Corporation of the Soviet Union. (International Atomic Energy Agency-IAEA, 2005)CausesThere are two possible causes. The first is operator error. The turbine exploded during testing and the operator ignored the rules and regulations. The operator deactivated the technical protection systems, as well as all the safety barriers. This happened because of a lack of education and training, which resulted in a lack of knowledge about nuclear reactors. He simply ignored the test steps and chose the dangerous shortcut to complete the test quickly. The other possible cause is incorrect instructions and design. This argument was announced in 1992. Both possible causes have been lobbied for by different groups. And the Soviet Union did not provide enough data; the exact cause therefore remains veiled. (IAEA, 2005)DamageThe greatest damage is the exposure of people to radiation. 530,000 local recovery workers were exposed to radiation, the effective dose being the same as fifty years of natural radiation exposure (IAEA, 1996). 31 nuclear power personnel and emergency responders died as a direct result, and the Chernobyl Forum anticipates the total number of leaks a year later. Another cause of the disaster is that the government ignored the risk of a tsunami. Scientists have warned of the danger of the tsunami and advised them to strengthen protection against the tsunami threat. However, the government did not heed this advice (IAEA, 2011). Damage Radiation emitted by the ground, air and sea. Around 20 kilometers of areas around the nuclear power plants were contaminated and residents 20 to 30 kilometers from the nuclear power plant were asked to leave the area. The polluted coolant goes into the Pacific Ocean, which is very dangerous, because human beings are at the top of the food chain, therefore, eating fish can lead to cancer. The Pacific Ocean is home to the world's largest fishery and Japan's per capita fish consumption is the highest in the world (Mccurry, 2014).Effect of the disaster