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Title: Importance ranking based on aging considerations of components included in probabilistic risk assessments

Abstract

This report presents a method for focusing additional research on aging phenomena that affects nuclear power plant components. Specifically, the method ranks components using a risk aging sensitivity measure that describes the change in risk due to changes in component failure rate. Describing the aging phenomena and the resulting time-dependent component failure rate changes is beyond the scope of this study. The applications use average component unavailability equations currently employed in PRAs to calculate the risk aging sensitivity. A more exact calculation is possible by using unavailability equations that include the time-dependent characteristics are not well-known. The risk aging sensitivity measure presented here is, therefore, segregated from these time-dependent effects and addresses only the time-independent portion of aging phenomena. The results identify the component types that show the most potential for risk change due to aging phenomena. Future research on the time-dependent portion of aging phenomena for these component types is needed to completely describe the risk impact due to component aging.

Authors:
; ; ;
Publication Date:
Research Org.:
Battelle Columbus Labs., OH (USA)
OSTI Identifier:
6004772
Report Number(s):
NUREG/CR-4144; PNL-5389
ON: TI85010128
DOE Contract Number:  
AC06-76RL01830
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; BWR TYPE REACTORS; REACTOR COMPONENTS; PWR TYPE REACTORS; FAILURES; RISK ASSESSMENT; AGING; PROBABILISTIC ESTIMATION; REACTOR SAFETY; RELIABILITY; STEAM GENERATORS; SYSTEM FAILURE ANALYSIS; BOILERS; REACTORS; SAFETY; SYSTEMS ANALYSIS; VAPOR GENERATORS; WATER COOLED REACTORS; WATER MODERATED REACTORS; 220900* - Nuclear Reactor Technology- Reactor Safety; 210200 - Power Reactors, Nonbreeding, Light-Water Moderated, Nonboiling Water Cooled; 210100 - Power Reactors, Nonbreeding, Light-Water Moderated, Boiling Water Cooled

Citation Formats

Davis, T, Shafaghi, A, Kurth, R, and Leverenz, F. Importance ranking based on aging considerations of components included in probabilistic risk assessments. United States: N. p., 1985. Web.
Davis, T, Shafaghi, A, Kurth, R, & Leverenz, F. Importance ranking based on aging considerations of components included in probabilistic risk assessments. United States.
Davis, T, Shafaghi, A, Kurth, R, and Leverenz, F. 1985. "Importance ranking based on aging considerations of components included in probabilistic risk assessments". United States.
@article{osti_6004772,
title = {Importance ranking based on aging considerations of components included in probabilistic risk assessments},
author = {Davis, T and Shafaghi, A and Kurth, R and Leverenz, F},
abstractNote = {This report presents a method for focusing additional research on aging phenomena that affects nuclear power plant components. Specifically, the method ranks components using a risk aging sensitivity measure that describes the change in risk due to changes in component failure rate. Describing the aging phenomena and the resulting time-dependent component failure rate changes is beyond the scope of this study. The applications use average component unavailability equations currently employed in PRAs to calculate the risk aging sensitivity. A more exact calculation is possible by using unavailability equations that include the time-dependent characteristics are not well-known. The risk aging sensitivity measure presented here is, therefore, segregated from these time-dependent effects and addresses only the time-independent portion of aging phenomena. The results identify the component types that show the most potential for risk change due to aging phenomena. Future research on the time-dependent portion of aging phenomena for these component types is needed to completely describe the risk impact due to component aging.},
doi = {},
url = {https://www.osti.gov/biblio/6004772}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Apr 01 00:00:00 EST 1985},
month = {Mon Apr 01 00:00:00 EST 1985}
}

Technical Report:
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