Importance ranking based on aging considerations of components included in probabilistic risk assessments
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.
- Research Organization:
- Battelle Columbus Labs., OH (USA)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 6004772
- Report Number(s):
- NUREG/CR-4144; PNL-5389; ON: TI85010128
- Country of Publication:
- United States
- Language:
- English
Similar Records
Multi-State Physics Models of Aging Passive Components in Probabilistic Risk Assessment
Coupling RAVEN to SAPHIRE for Performing Time Dependent Probabilistic Risk Assessment
Related Subjects
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