Comparative study of actual nuclear plant transients for several plants and implications for fatigue usage
Westinghouse has completed four nuclear plant life extension studies (PLEX), which involved the counting of plant transients and fatigue assessment of critical nuclear steam supply system components. For the first time, a comparison is made among four different plants. The plants ranged in net power rating from 320 to 781 MW(electric), covered two-, three-, and four-loop Westinghouse configurations, and experienced 13 to 18 yr of actual operation. For Westinghouse-designed plants, a systems standard design criteria document is issued to the component designer that specifies the number of design transients, severity, and type. In general, fatigue should not be the most limiting degradation mechanism during the plant operating design lifetime. For life extension, selected areas in the plant will have to be reevaluated. In any event, fatigue is an irreversible degradation mechanism and should be closely monitored by a plant owner. The transient count of actual transients, as compared to the original design transients, illustrates that margins exist in some cases in the number of transient occurrences and in the severity of the transients. Optimism exists for margin available that will be useful for PLEX and/or considerations of environmental effects on the S-N curve of the American Society of Mechanical Engineers code.
- OSTI ID:
- 7148157
- Report Number(s):
- CONF-8711195-; TRN: 88-028676
- Journal Information:
- Trans. Am. Nucl. Soc.; (United States), Vol. 55; Conference: American Nuclear Society winter meeting, Los Angeles, CA, USA, 15 Nov 1987
- Country of Publication:
- United States
- Language:
- English
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FATIGUE
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TRANSIENTS
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PRESSURE VESSELS
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