「常陽」の安全確保に係る報告 別冊;安全確保に係る設備点検結果

The Report on JOYO plant safety for sodium leak and fire protection; The result of checks of equipment

佐竹 秀和; 冨田 直樹; 礒崎 和則 ; 川原 啓孝 ; 小川 徹; 長井 秋則; 坂井 茂

not registered; not registered; Isozaki, Kazunori; not registered; not registered; Nagai, Akinori; not registered

平成7年12月8日、高速増殖原型炉「もんじゅ」のナトリウム漏洩事故が発生した。当時、高速実験炉「常陽」では第11回定期検査を実施中であったが、安全確認のため、施設の点検、マニュアル類の再確認とその周知徹底、ナトリウム漏洩を想定した総合防災訓練等を実施し、当核事故に係る安全性の再点検・再評価を行った。また、必要に応じて漏洩ナトリウムに係るプラント運転管理の見直しを実施してきた。これらの点検・評価、設備改造等の結果、「常陽」は1年10ヶ月ぶりに原子炉を起動し、3月24日の定期検査合格証の受託をもって、運転を再開した。本報告書は、「もんじゅ」事故発生から運転再開に至るまで「常陽」が実施してきた安全確保に係る諸施策についてまとめたものである。

On the 8th in December 1995, the secondary sodium leak accident occurred at Prototype Fast Breeder Reactor MONJU. Experimental Fast Reactor JOYO was under the 11th periodical inspection then. Total review of the JOYO plant for check of the sodium leak related equipment, check of manuals, and a practice of disaster prevention for sodium leak, and so on were made to have assurance of plant safety, which was required based on official report of MONJU sodium leak accident. Moreover, we properly improved the equipment and reinvestigated the plant management. As the result of these checks, evaluations and improvements, plant safety for sodium leak and fire was secured, and JOYO was started reactor operation on the 3rd in March 1997 after the confirmation by Science and Technology Agency (STA) and Ibaraki prefecture, and on 24th, JOYO passed the 11th periodical inspection, and began to operate the JOYO plant duty cycle. This report describes about the result of those checks of equipment.