Abstract To respond to seismic and other natural hazard events, designers of the Japan Sodium-cooled Fast Reactor (JSFR), an advanced loop-type reactor, are planning to adopt a steel-plate reinforced concrete structure reactor building and an advanced seismic isolation system to strengthen this building. The design changes have been initiated by lessons learned from the Fukushima Daiichi nuclear power plant (Fukushima I NPP) accident. These enhancements to the design are to ensure that the JSFR structure can withstand external hazards and a severe accident. This evaluation and countermeasure study of external hazards and severe accident response by JSFR are based on the JSFR design before the Fukushima I NPP accident (2010 JSFR design). The method to evaluate the influence of external hazards on the JSFR design has applied Japanese codes and standards to show that the 2010 JSFR design of the building can withstand external hazards without additional countermeasures. And, for extreme conditions, few countermeasures are needed; however, the countermeasures considered have limited impact on the JSFR design because they do not significantly change the reactor building design. This paper gives a detailed evaluation of the countermeasures for the external hazards and severe accidents that could impact the JSFR building.

中文翻译：

---

JSFR反应堆厂房外部危害的安全增强方法

摘要 为应对地震和其他自然灾害事件，日本钠冷快堆（JSFR）这一先进的环型反应堆的设计者正计划采用钢板钢筋混凝土结构的反应堆建筑和先进的隔震系统。加强这座建筑。从福岛第一核电站 (Fukushima I NPP) 事故中吸取的经验教训启动了设计变更。这些对设计的改进是为了确保 JSFR 结构能够承受外部危险和严重事故。JSFR 对外部危害和严重事故响应的评估和对策研究基于福岛 I 核电厂事故前的 JSFR 设计（2010 JSFR 设计）。评估外部危害对JSFR设计影响的方法应用了日本的规范和标准，表明2010年JSFR设计的建筑物可以在不采取额外对策的情况下承受外部危害。而且，对于极端条件，几乎不需要采取对策；然而，所考虑的对策对 JSFR 设计的影响有限，因为它们不会显着改变反应堆建筑设计。本文对可能影响JSFR建筑的外部危害和严重事故的对策进行了详细评估。所考虑的对策对 JSFR 设计的影响有限，因为它们不会显着改变反应堆建筑设计。本文对可能影响JSFR建筑的外部危害和严重事故的对策进行了详细评估。所考虑的对策对 JSFR 设计的影响有限，因为它们不会显着改变反应堆建筑设计。本文对可能影响JSFR建筑的外部危害和严重事故的对策进行了详细评估。