Chernobyl accident summary

Nuclear power, electricity generated by power plants that derive their heat from fission in a nuclear reactor. Except for the reactor, which plays the role of a boiler in a fossil-fuel power plant, a nuclear power plant is similar to a large coal-fired power plant, with pumps, valves, steam

Nuclear reactor, any of a class of devices that can initiate and control a self-sustaining series of nuclear fissions. Nuclear reactors are used as research tools, as systems for producing radioactive isotopes, and most prominently as energy sources for nuclear power plants. Nuclear reactors

Ukraine, country located in eastern Europe, the second largest on the continent after Russia. The capital is Kyiv, located on the Dnieper River in north-central Ukraine. A fully independent Ukraine emerged only late in the 20th century, after long periods of successive domination by