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Safety improvement in building layout design to meet the safety design criteria for the Generation IV SFR

第4世代ナトリウム高速炉の安全設計クライテリアに適合する建屋配置の安全性向上

加藤 篤志; 近澤 佳隆; 鍋島 邦彦; 岩崎 幹典*; 秋山 洋*; 大矢 武明*

Kato, Atsushi; Chikazawa, Yoshitaka; Nabeshima, Kunihiko; Iwasaki, Mikinori*; Akiyama, Yo*; Oya, Takeaki*

JSFRは先進ループ型ナトリウム冷却高速炉である。福島事故後、安全対策の強化が、主に崩壊熱除去系、使用済燃料プール、非常用電源設備などにおいて実施された。本稿は、これらの安全強化策と整合した建屋配置設計における基本的考え方を示す。シビアアクシデントに対する耐性強化の観点から、航空機衝突と続く火災、地震と続く津波などを想定し、これらを起因とする安全設備の喪失を防ぐための検討が実施された。この結果、崩壊熱除去系のうち少なくとも1系統は生き残り、非常用電源も使用可能とでき得る概念が示された。

Japan sodium cooled fast reactor is the advanced loop type reactor developing in Japan. After the Fukushima-Dai-ichi NPP accident, system enhancement against severe accident have been investigated mainly for residual decay heat removal system, spent fuel storage system and emergency power sources in order to satisfy the safety design criteria for Generation IV SFR. This paper describes principle of the building layout design and the actual approach to be consistent with the recent design enhancement in JSFR. From the perspective of greater ability to withstand severe events, the principles of the building layout design as the measures against aircraft attack and the consequential fire, and tsunami are introduced in order to avoid local event initiating and simultaneous redundant failure of the safety grade facilities and could achieve lowering risk of the loss of all stuck and maintaining the essential power supply.

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