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On January 3, 1961 a nuclear reactor located at the Nuclear Reactor Testing Station, near Idaho Falls, ID, suffered a STEAM explosion while undergoing maintenance. While changing control rod motors one control rod was accidently pulled too far out of the reactor. The reactor instantly went critical, super heated the cooling water to steam, and the steam expolded. It was NOT a nuclear explosion. Three Naval personnel were killed. Two died of radiation before they could leave the building, the third was pinned to the roof by a control rod and apparently died immediately.

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Where and when did the most serious us nuclear power plant accident occur?

Regarding human life, the worst nuclear power plant accident in the US was an explosion in Idaho Falls in 1961 at an experimental Army reactor that killed 3 people. Regarding monetary cost, the worst disaster was the Three Mile Island incident, in which a reactor had a partial meltdown and released a small amount of radiation into the atmosphere. Although very expensive to clean up, no one was harmed by the incident. (For comparison, coal power plants release the same amount of radioactive material into the atmosphere every few days.)


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