05000315/FIN-2017002-01
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Finding | |
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| Title | Failure to Ensure the Unit 2 CCW Heat E xchanger Monitoring Program Could Demonstrate Its Continued Operability Between Maintenance Intervals |
| Description | Green . The inspectors identified a finding of very -low safety significance (Green) and associated NCV of Title 10 of the Code of Federal Regulations , (CFR) Part 50, Appendix B, Criterion XI, Test Control, for the licensees failure to establish a heat exchanger monitoring program for the Unit 2 east component cooling water (CCW) heat exchanger that demonstrated it would perform satisfactorily in service and remain operable within its required range of physical conditions for the entire interval between heat exchanger maintenance inspections and c leanings. The licensee entered this finding into their Corrective Action Program (CAP) and, after a review of the Ultimate Heat Sink temperatures, determined the Unit 2 East CCW heat exchanger remained operable because the Ultimate Heat Sink temperatures had remained below the point where operability of the heat exchanger could be challenged. The performance deficiency was determined to be more- than- minor because it was associated with the Mitigating Systems cornerstone attribute of Equipment Performance and it adversely affected the associated cornerstone objective to ensure the availability, reliability, and capability of the CCW system to respond to initiating events to prevent undesirable consequences. Specifically, the monitoring program established for the Unit 2 East CCW heat exchanger did not ensure its availability, reliability, and capability for the entire interval between heat exchanger maintenance inspections and cleanings. The finding screened as of very -low safety significance (Green) because although it affected the design or qualification of the Unit 2 East CCW heat exchanger, it did not result in the loss of operability or functionality of the heat exchanger . The inspectors determined this finding had an associated cross -cutting aspect, Design Margins, in the Human Performance cross -cutting area [H.6] because the licensee did not ensure the Unit 2 East CCW heat exchanger s heat transfer margin was carefully guarded after discovering excessive tube plugging above the acceptance criteria i n 2016. Specifically, special attention was not placed on maintaining the safety -related heat exchanger to ensure it would remain capable of performing its specified safety function within the required range of physical conditions during the entire interval between heat exchanger maintenance inspections and cleanings. |
| Site: | Cook  |
|---|---|
| Report | IR 05000315/2017002 Section 1R07 |
| Date counted | Jun 30, 2017 (2017Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.07 |
| Inspectors (proximate) | J Ellegood T Taylor T Go V Petrella L Rodriguez B Dickson |
| Violation of: | 10 CFR 50 Appendix B 10 CFR 50 Appendix B Criterion XI |
| CCA | H.6, Design Margins |
| INPO aspect | WP.2 |
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Finding - Cook - IR 05000315/2017002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Cook) @ 2017Q2
Self-Identified List (Cook)
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