Snubber reduction program at LaSalle County Station, Units 1 and 2
The snubber reduction program at LaSalle County Station, units 1 and 2, is one of the largest in the industry today. On unit 2, snubber reduction were performed on 36 subsystems that originally contained 374 snubbers. The field work was completed for 24 of the 36 subsystems during unit 2's first refueling outage in the spring of 1987. On unit 1, 155 subsystems containing 1167 snubbers are currently being reanalyzed to reduce snubbers. Field removal of snubbers from the unit 1 plant will occur during unit 1's second refueling outage in the spring of 1988. The driving force behind snubber reduction has been the high cost of functional testing. During the unit 1 and unit 2 first refueling outages, all snubbers required testing. The overall failure rate was 8.3% for the 1250 unit 1 snubbers and 4.3% for the 1140 unit 2 snubbers. The major cost component of functional testing was the craft labor to remove, transport, and reinstall snubbers, averaging $1460 per snubber. Radiation exposure due to snubbers was almost 160 person-rem per outage. Other costs resulted from the testing contractor, failed snubber evaluations, and actions to prevent repeated snubber failures. Snubber-related problems also indirectly extended the outages by diverting limited station manpower from critical path projects.
- OSTI ID:
- 6866985
- Report Number(s):
- CONF-8711195-
- Journal Information:
- Trans. Am. Nucl. Soc.; (United States), Journal Name: Trans. Am. Nucl. Soc.; (United States) Vol. 55; ISSN TANSA
- Country of Publication:
- United States
- Language:
- English
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