05000390/FIN-2015002-03
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Finding | |
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| Title | Failure To Consider The Effects Of A Break In Non- Seismic ERCW Piping |
| Description | The NRC identified a NCV of 10 CFR Part 50, Appendix B, Criterion III, "Design Control," for the licensees failure to consider the effects of a break in the non-seismic portion of the essential raw cooling water (ERCW) discharge flow path to the cooling tower basin in the calculation used to determine the net positive suction head available to the auxiliary feedwater pumps. The licensee entered the issue into their corrective action program as problem evaluation report 97923 and has planned corrective actions to seismically qualify portions of the ERCW discharge path to the cooling towers. The performance deficiency was determined to be more than minor because it was associated with the mitigating systems cornerstone attribute of design control and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences by potentially reducing the Net Posittive Suction Head (NPSH) available to the Auxillary Feedwater (AFW) pumps. The inspectors determined the finding to be of very low safety significance (Green) because the finding was a deficiency affecting the design or qualification of a mitigating structure, system, or component (SSC), and the SSC maintained its operability. The inspectors determined that no cross-cutting aspect was applicable because the finding was not indicative of current licensee performance. |
| Site: | Watts Bar  |
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| Report | IR 05000390/2015002 Section 1R21 |
| Date counted | Jun 30, 2015 (2015Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | A Blarney C Cheung J Eargle J Hamman J Nadel J Rivera-Ortiz P Cooper R Egli R Hickok T Palmer W Russell |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| INPO aspect | |
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Finding - Watts Bar - IR 05000390/2015002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Watts Bar) @ 2015Q2
Self-Identified List (Watts Bar)
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