Lucens reactor, Former experimental nuclear reactor in Lucens, Switzerland.
The Lucens reactor was an underground experimental facility built within three separate cavities beneath a hillside. The system used heavy water as a moderator and enriched uranium fuel to generate power at a scale of approximately 6 MW.
Construction began in 1962 as a joint effort between Reactor Ltd and private industry groups, with the facility completed by 1967. Operations started in early 1968 but ended within a year after a cooling system malfunction forced permanent shutdown.
The reactor reflected Switzerland's postwar ambition to develop its own nuclear power technology and stand as an independent industrial nation. This reflected a widespread belief that nuclear energy would become central to Europe's future.
The site is located in a hillside setting and remains closed to public access due to its contaminated status. Visitors interested in the facility can view historical photographs and documents at regional museums or research archives.
A partial core meltdown in 1969 resulted in radioactive contamination that was contained within the underground cavern structure. This made it one of the first cases where geological isolation served as a safety feature during a nuclear incident.
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