Decommissioning

Cavendish Nuclear Wins Monju Prototype Fast Reactor Decommissioning Contract

By Kamen Kraev
7 October 2025

JV with Amentum will build UK treatment facility for sodium coolant

Cavendish Nuclear Wins Monju Prototype Fast Reactor Decommissioning Contract
The  Monju prototype fast reactor site in Fukui Prefecture, western Japan. Courtesy Nife/Wikipedia Creative Commons Licence.
UK-based Cavendish Nuclear and its US-based partner Amentum have been awarded the next phase of work by the Japan Atomic Energy Agency (JAEA) to support the decommissioning of the Monju prototype fast reactor in Fukui Prefecture, western Japan.

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