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Safety principles and safety approaches for next generation sodium-cooled fast reactor

次世代ナトリウム冷却高速炉の安全原則及び安全方針

岡野 靖; 堺 公明; 中井 良大 

Okano, Yasushi; Sakai, Takaaki; Nakai, Ryodai

The paper reviews historical progresses related to SFR safety, and makes proposals on safety principles and safety approaches to be built into future SFR systems. Safety principles shall be based on the Defense-in-Depth philosophy with appropriate consideration of SFR characteristics as a fast reactor. Comprehensive considerations on safety event identification and categorization, and a set of event lists of Design-Basis-Event [DBE], Design Extension Condition [DEC], and exclusive events are proposed. Probabilistic approach should be supplementary utilized to support (or enforce) deterministic one. The most important key point of the SFR safety is how to manage the core disputative accident [CDA]; prevention and mitigation features and systems should be built into the future SFR because the CDA consequences excessively enlarged with increasing reactor output, and it should be assessed to confirm that there is no cliff-edge just near the design range.

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