Investor Presentaiton
NRA, Japan
Nuclear Regulation Authority
Appendix
New Regulatory Requirements:
Basic Policy
■ Place emphasis on Defense-in-Depth (DID)
■ Prepare multi-layered protective measures and, for each layer, achieve the
objective only in that layer regardless of the measures in the other layers.
■ Eliminate common cause failures
■ Strengthen fire protection and measures against tsunami inundation.
■ Enhanced reliability of SSCs important to safety (eliminate shared use
of passive components, if relied on for a long time).
■ Assess and enhance protective measures against extreme
natural hazards
■ Introduce conservative/robust approaches in assessment of earthquake
and tsunami and measures against tsunami inundation.
Make much account of "diversity" and "independence", shifting from
"redundancy centered".
■ Define "performance/functional" requirements
■ Provide flexibility in choosing acceptable measures.
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