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Report No.
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Design and assessment approach on advanced SFR safety with emphasis on the core disruptive accident issue

Nakai, Ryodai 

The concept of defense in depth (DiD) shall be applied to the safety design of advanced SFRs. Through the prevention, detection and control of accident, core disruptive accident (CDA) shall be excluded from Design Basis Events (DBEs). Considering that the SFR reactor core is not the most reactive configuration unlike in the LWRs, design measures to prevent and mitigate the consequences of CDA are being considered as provisions for beyond design basis events (BDBEs). To effectively meet the future nuclear energy system safety goals, advanced SFR designs should exploit passive safety features to increase safety margins and to enhance reliability. In particular the safety approach to eliminate the severe re-criticality will be highly desirable, because with this approach, severe accidents in SFRs can be simply regarded as similar to LWRs.

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