Which nuclear accident resulted in the US refusing to propose any new nuclear power plants for about 30 years?

The nuclear accident that caused the United States to refuse to propose any new nuclear power plants for about 30 years was the Three Mile Island accident, which occurred on March 28, 1979. This incident involved a partial meltdown of one of the reactors at the Three Mile Island Nuclear Generating Station in Pennsylvania.

The accident led to widespread public fear and concern about the safety of nuclear power, resulting in a moratorium on new nuclear plant construction as regulatory frameworks were reassessed and strengthened. Although no immediate deaths or injuries occurred as a result of the accident, it significantly impacted public perception and government policy regarding nuclear energy in the United States, effectively halting new projects until the early 2000s.

The Three Mile Island event underscored the potential risks associated with nuclear energy and spurred improvements in safety standards, reactor design, and emergency preparedness in the nuclear industry.