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Title: Risk-informed snubber inservice testing guidelines: Pilot project studies. Final report

Abstract

Most plant snubber examination and test program requirements are based on the NRC Standard Technical Specifications, or the ASME OM Code Subsection ISTD. Recently the NRC has allowed these snubber requirements to be removed from the plant Technical Specifications to a licensee controlled document, which can be modified via the 10CFR50.59 process. This EPRI research project is providing the technical basis for a risk-informed change to the snubber requirements. This project builds on previous EPRI and ASME work to develop this risk-informed (RI) methodology for inservice testing IST of safety-related snubbers. The NRC has already embarked on RI-IST, as well as other risk-informed initiatives. This methodology consists of applying the new standard risk-informed IST process which consists of: risk ranking the IST components utilizing plant specific PRA; blending the probabilistic and deterministic information; making a safety categorization decision for each IST component as either HSSC or LSSC; and identifying different testing strategies for HSSC versus LSSC components. Since snubbers are not modeled in the PRA, system functional risk was deemed to be an adequate surrogate measure of snubber risk. The methodology developed in this research study was applied to seven pilot plants (eleven units) to determine the impact on plantmore » safety, outage costs, and snubber failures. Three of those plants applied the methodology to all safety-related snubbers.« less

Publication Date:
Research Org.:
Electric Power Research Inst., Palo Alto, CA (United States); Wesley Corp., Tulsa, OK (United States); Palmer Group International, Hixson, TN (United States)
Sponsoring Org.:
Electric Power Research Inst., Palo Alto, CA (United States)
OSTI Identifier:
354922
Report Number(s):
EPRI-TR-110381
TRN: AHC29924%%126
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Mar 1998
Country of Publication:
United States
Language:
English
Subject:
22 NUCLEAR REACTOR TECHNOLOGY; 21 NUCLEAR POWER REACTORS AND ASSOCIATED PLANTS; IN-SERVICE INSPECTION; REACTOR MAINTENANCE; PIPES; NUCLEAR POWER PLANTS; SHOCK ABSORBERS; ENGINEERED SAFETY SYSTEMS; PWR TYPE REACTORS; BWR TYPE REACTORS

Citation Formats

. Risk-informed snubber inservice testing guidelines: Pilot project studies. Final report. United States: N. p., 1998. Web.
. Risk-informed snubber inservice testing guidelines: Pilot project studies. Final report. United States.
. Sun . "Risk-informed snubber inservice testing guidelines: Pilot project studies. Final report". United States.
@article{osti_354922,
title = {Risk-informed snubber inservice testing guidelines: Pilot project studies. Final report},
author = {},
abstractNote = {Most plant snubber examination and test program requirements are based on the NRC Standard Technical Specifications, or the ASME OM Code Subsection ISTD. Recently the NRC has allowed these snubber requirements to be removed from the plant Technical Specifications to a licensee controlled document, which can be modified via the 10CFR50.59 process. This EPRI research project is providing the technical basis for a risk-informed change to the snubber requirements. This project builds on previous EPRI and ASME work to develop this risk-informed (RI) methodology for inservice testing IST of safety-related snubbers. The NRC has already embarked on RI-IST, as well as other risk-informed initiatives. This methodology consists of applying the new standard risk-informed IST process which consists of: risk ranking the IST components utilizing plant specific PRA; blending the probabilistic and deterministic information; making a safety categorization decision for each IST component as either HSSC or LSSC; and identifying different testing strategies for HSSC versus LSSC components. Since snubbers are not modeled in the PRA, system functional risk was deemed to be an adequate surrogate measure of snubber risk. The methodology developed in this research study was applied to seven pilot plants (eleven units) to determine the impact on plant safety, outage costs, and snubber failures. Three of those plants applied the methodology to all safety-related snubbers.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {3}
}

Technical Report:
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