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France France · Saint-Paul-les-Durance · 43.688, 5.708

Marius

Marius, a research reactor (critical assembly) in Saint-Paul-les-Durance, France, with 400 W of thermal power, operated by CEN de Cadarache. Decommissioned, first critical in 1960.

It was one of the 38 research reactors France has had; 2 remain in operation today. It went critical 12 years after the first research reactor in France, ZOE (EL-1) (1948). 44 critical assemblies remain in operation today across 12 countries.

Country
France
City
Saint-Paul-les-Durance
Type
Critical assembly
Thermal power
400 W
Operator
CEN de Cadarache
Status
Decommissioned
First criticality
1960

Data: IAEA RRDB · updated on Sep 3, 2026

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