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定常臨界実験装置STACYの更新改造と運転再開

Renovation and restart of STACY (Static Experiment Critical Facility)

曽野 浩樹 

Sono, Hiroki

定常臨界実験装置STACYは、「溶液燃料を用いる原子炉」から「棒状燃料及び軽水減速材を用いる原子炉」に更新改造され、2024年8月2日、13年8か月ぶりに運転を再開した。その間、許認可対応8年11か月、更新改造工事3年1か月、原子炉性能に係る使用前事業者検査4か月ほかがあった。STACYの生い立ちから運転再開に至るまでの軌跡と今後の利活用について報告する。

The Static Experiment Critical Facility (STACY) was renovated from a "solution fuel reactor" to a "reactor using fuel rods and light water moderator", and restarted operation on August 2, 2024, after a hiatus of 13 years and 8 months. During that time, it took 8 years and 11 months to obtain its permission and approval, 3 years and 1 month for its construction, and 4 months for pre-operation inspections on the reactor performance. This article reports on the history of STACY from its birth to its restart of operation, as well as its future utilization.

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