Twenty years ago, on April 26, 1986, Unit 4 of the Chernobyl Nuclear Power Plant experienced a nuclear reactor accident and released six times more radionuclides into the atmosphere than the Hiroshima atomic bomb. The accident significantly damaged the environment and is expected to result in as many as 4000 deaths due to leukemia and other cancers. The cause of the accident was specific to a particular Soviet-built reactor; but the environmental and human consequences are applicable to Western nuclear plant accidents. Contrary to public perception, the former Soviet Union did what they could...