Risk-significant functional dependencies in PWRs: Final report
This report was inspired by the informal observation that functional dependencies among plant systems, particularly those between frontline safety systems and support systems, are often major contributors to the risks calculated in completed PRAs. This study provides evidence that this is indeed the case and seeks to determine how the risk impact of functional dependencies can be reduced in future nuclear power plant designs. Our insights have been summarized by a set of nine design principles that are not new to the nuclear industry and, indeed, have generally been implemented. Their risk significance, however, may not have been fully appreciated in the design process because of the usual practice of not emphasizing the beyond-design basis accidents. It is in pointing out the dependencies that are important to risk that both PRAs and this study make a contribution. 1 fig., 6 tabs.
- Research Organization:
- Pickard, Lowe and Garrick, Inc., Newport Beach, CA (USA)
- OSTI ID:
- 5625193
- Report Number(s):
- EPRI-NP-5536; ON: TI88920137
- Country of Publication:
- United States
- Language:
- English
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21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
PWR TYPE REACTORS
REACTOR ACCIDENTS
RISK ASSESSMENT
BLACKOUTS
PROBABILISTIC ESTIMATION
REACTOR CORE DISRUPTION
ACCIDENTS
REACTORS
WATER COOLED REACTORS
WATER MODERATED REACTORS
220900* - Nuclear Reactor Technology- Reactor Safety
210200 - Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled