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Greece's lone nuclear reactor faces final shutdown after 43 years of scientific breakthroughs

From cancer treatments to seismic risks, this reactor shaped Greece's science—and its closure may yet influence the country's nuclear future. A museum will soon tell its story.

The image shows a diagram of a very high-temperature reactor, with text accompanying it. The...
The image shows a diagram of a very high-temperature reactor, with text accompanying it. The reactor is composed of a large, cylindrical structure with a series of pipes and valves, and a large tank at the bottom. The text accompanying the diagram provides further information about the reactor, such as its purpose and how it works.

Greece's lone nuclear reactor faces final shutdown after 43 years of scientific breakthroughs

Greece's only nuclear reactor, located at the Demokritos National Center for Scientific Research, has remained inactive since 2004. Originally built under the US-led Atoms for Peace programme, it operated for 43 years before closing due to safety concerns ahead of the Athens Olympics. The reactor began operations in 1961 as a research facility. Over its lifespan, it produced radioisotopes for cancer treatments, tested material durability, and supported scientific innovation. It was permanently shut down in 2004, marking the end of Greece's brief experience with nuclear energy.

Decommissioning is now underway, with completion expected by 2032. Plans include converting part of the site into a museum to document its history and contributions. George Katsoulas, the reactor's operations supervisor, has worked at the facility for over half his life, overseeing its final years. The reactor's closure followed Greece's 1983 decision to abandon nuclear power plans due to seismic risks. However, the expertise gained from its operation remains relevant today. With Greece now exploring modular nuclear reactors to boost energy independence, past experience could inform future discussions.

The Demokritos reactor's legacy spans scientific research, medical applications, and energy policy debates. Its decommissioning will take another eight years, while a planned museum aims to preserve its role in Greek science. Meanwhile, the country's renewed interest in nuclear technology may draw on lessons from its only operational reactor.

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