A stylized approach for evaluation of incremental change in CANDU ROP/NOP trip functional failure probability under aging conditions

Abstract of a technical presentation presented at:
The 19th Pacific Basin Nuclear Conference (PBNC 2014)
Vancouver, British Columbia, Canada,
August 24–28, 2014.

Prepared by:
Dumitru Serghiuta and John Tholammakkil
Canadian Nuclear Safety Commission (CNSC)
Ottawa, Ontario, Canada

Abstract

This paper discusses a stylized approach to evaluation of incremental change in the CANDU ROP/NOP trip functional failure probability under aging conditions and its use for evaluation of incremental change in risk for a postulated slow LOR event and independent risk-informed verification of adequacy of ROP/NOP trip setpoint value under aging conditions. The proposed stylized method is not a substitute for the design ROP/NOP methodology for calculation of ROP/NOP required trip setpoint.