Joint Assessment of Cable Damage and Quantification of Effects from Fire (JACQUE-FIRE): Technical Resolution to Open Issues On Nuclear Power Plant Fire-Induced Circuit Failure, Final Report (NUREG/CR-7150, Volume 3, BNL-NUREG-98204-2012, EPRI 3002009214)

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Publication Information

Final Report: November 2017

Prepared By:
M. Subudhi
Brookhaven National Laboratory

G. Taylor, NRC Technical Project Manager
Office of Nuclear Regulatory Research U.S. Nuclear Regulatory Commission Washington DC 20555-0001	Electric Power Research Institute 3420 Hillview Avenue Palo Alto, CA 94304-1338
U.S. NRC/RES Project Manager M.H. Salley	EPRI Project Manager A. Lindeman

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Abstract

This report builds upon two previous reports, titled Joint Assessment of Cable Damage and Quantification of Effects from Fire (JACQUE-FIRE), Volume 1 and Volume 2. This work aims at providing a better understanding of failure modes in electrical control circuits that might occur in nuclear power plants as a result of fire damage to electric cables. This research was conducted by the United States Nuclear Regulatory Commission (NRC) and the Electric Power Research Institute (EPRI) under a Memorandum of Understanding using a balanced team of experts from the regulator and the industry. The objectives of this report are to present technical recommendations on a number of circuit analysis issues and to update or clarify positions developed in earlier research. The recommendations for resolution of these issues in a technical setting are intended to facilitate development of a solid technical foundation and a stable framework to support a consistent approach for conducting and reviewing post-fire safe-shutdown analyses.

This working group was convened to address several remaining circuit analysis issues related to deterministic post-fire safe-shutdown analysis. The working group findings are presented as clarifications and recommendations. Clarifications are presented on circuit failure modes and terminology. Recommendations are provided on: design considerations for shorting switches, hot short-induced multiple spurious operations in DC and AC control circuits, and secondary fire risk due to fire-induced open-circuited current transformers. Risk-insights, developed from the PRA expert panel (JACQUE-FIRE Volume 2), have been used to revise earlier PIRT panel findings from JACQUE-FIRE Volume 1.