高速増殖炉の安全性に関する長期研究開発計画(案) : 炉心の安全性に関する研究開発

Long-term R&D plan on LMFBR safety research; Reactor safety R&D plan

高橋 克郎*; 田中 信夫*; 斉藤 正樹*

not registered; not registered; not registered

高速増殖炉の実用化および「もんじゅ」53項目の宿題に向けて,炉心の安全性に関する研究開発の現状を調査し,今後必要な研究開発項目を摘出した。そして炉心安全工学室が今後取組むべき研究開発項目の現状背景を分析し,立案した研究開発計画とその必要性および目的について述べている。▲それらをまとめると,高速炉の一次格納健全性の評価およびその信頼性を向上するために,実施すべき研究開発は,▲・大型解析コードSAS,SIMMERの改良,検証および整備を行なう。▲・これらに必要な炉外試験を実施する。また炉内試験については当面国際協力を有効に活用する。▲・さらに重要な問題である事故時の熱的負荷を扱う溶融炉心物質の挙動に関する実験的研究に着手する。▲・事故後の崩壊熱除去過程の評価手法の確立に努める▲・局所事故シナリオの完成を目ざし,事故早期発見終息への方策を追求する。▲等である。▲

A long-term program plan was explored by the members of Reactor Safety Section(RSS), O-arai Engineering Center, Power Reactor and Nuclear Fuel Development Corporation(PNC) for the future research and development(R&D) on the safety of liquid-metal fast breeder reactors(LMFBRs). The main objeetives of this program plan are to fulfill the requirements raised during the licensing of Monju, and to support the conceptual design and licensing of a future demonstration plant. The current program plan is restricted to R&D areas on the assessmpnt of reliability or integrity of the reactor primary system, which is the ultimate goal of PNC/RSS. Key issues are extracted based on the detailed review of the current status and understanding of the individual R&D areas. They are discussed in this report with emphasizing their needs and priorities. In summary, the future R&D in PNC/RSS should be directed toward: (1)Continuation of the developlment, improvement and verification of the large safety analysis codes such as SAS and SIMMER; (2)Continuation and initiation of out-of-pile and in-pile experimental studies to verify the above computer codes; (3)Continuation of international participation in the large code developments and in-pile experiments; (4)Initiation of an experimental study on the behavior of the molten core materials which is important in assessing the thermal consequences of an accident; (5)Method development for a mechanistic post-accident heat removal analysis; and (6)Scenario development on local-fault sequences to achieve the early detection and termination of the accidents.