05000400/FIN-2011008-05
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Finding | |
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Title | Failure to Control Design Limits for ESCW Flow Balancing |
Description | The team identified a Green, NCV of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the licensees failure to control design limits for Essential Services Chilled Water System (ESCW) flow balancing. Immediate corrective actions included flow balance testing to address operability concerns. Permanent corrective actions are still being evaluated by the licensee. The licensee entered this issue into the CAP as NCR 458046. The failure to control design limits for ESCW System flow balancing was a performance deficiency. This finding was more than minor because it affected the Mitigating Systems Cornerstone objective of ensuring the availability, reliability, and capability of the safety-related ventilation system to respond to initiating events to prevent undesirable consequences. Specifically, an operability limit was added to the ESCW flow balance procedure, based on information from a previous operability evaluation for an identified degraded/nonconforming condition. However, the operability limits established were not integrated into the plants design basis prior to being incorporated into the procedure and resulted in loss of margin and potentially affected the operability of the system. The finding was of very low safety significance because the finding did not result in a loss of safety function. The team determined that no cross cutting aspect was applicable to this performance deficiency because this finding was not indicative of current licensee performance. |
Site: | Harris ![]() |
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Report | IR 05000400/2011008 Section 1R21 |
Date counted | Jun 30, 2011 (2011Q2) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.21 |
Inspectors (proximate) | S Walker C Baron G Skinner P Higgins D Mas-Penaranda R Patterson B Desai D Terri-Ward |
INPO aspect | |
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Finding - Harris - IR 05000400/2011008 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Harris) @ 2011Q2
Self-Identified List (Harris)
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