Top 3 Longest-Operating Nuclear Reactors

The detection of a reactor's afterglow underscores the enduring presence and operational longevity of these complex facilities, with some maintaining service for decades.

The top 3

1. Longest-Operating Reactor Globally: Beznau 1: The Beznau Nuclear Power Plant Unit 1 in Switzerland, which began producing power on September 1, 1969, holds the record as the world's oldest nuclear power reactor still in operation.
2. Longest-Operating US Reactor: Nine Mile Point Unit 1: Nine Mile Point Unit 1 in New York State, which entered commercial service in December 1969, is the oldest operating nuclear reactor in the United States.
3. Record for Continuous Operation: Heysham II Unit 2: Heysham II Unit 2 in the UK set a world record for continuous operation of a commercial nuclear power reactor, running for 895 days (projected to be 941 days) without interruption before a scheduled maintenance outage in 2016.

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