05000416/FIN-2010005-01
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Finding | |
|---|---|
| Title | Inadequate Operability Evaluation Following a Spurious Actuation of the Standby Service Water Pump House Ventilation Fan |
| Description | The inspectors identified a noncited violation of 10 CFR 50 Appendix B, Criterion V, involving a failure to follow procedures, which resulted in an inadequate operability evaluation. On December 5, 2010, a spurious actuation of the standby service water pump house ventilation system occurred, resulting in the pump house temperatures dropping below the design limit. In their operability evaluation, the licensee failed to consider the impact of the actual freezing conditions occurring at the site at that time, and operations did not secure the fan after the spurious actuation until questioned by the inspectors. The licensee subsequently revised the operability evaluation to properly account for environmental conditions in the pump house. The licensee entered this issue into their corrective action program as Condition Report CR-GGN-2011-00151. This performance deficiency is more than minor because it is associated with the mitigating systems cornerstone attribute of equipment performance as it adversely affected the cornerstone objective to ensure the availability, reliability and capability of systems that respond to initiating events to prevent undesirable consequences. Using the Phase 1 Worksheet in attachment 4 of Manual Chapter 0609, Significance Determination Process, the inspectors determined that this finding was of very-low safety significance (Green) because in Table 4a of the Phase 1 Screening Worksheet, all of the questions for the Mitigating Cornerstone were answered in the negative. This finding has a crosscutting aspect in the area of problem identification and resolution associated with the corrective actions component because the licensee did not thoroughly evaluate problems such that the resolutions address causes and extent of condition. |
| Site: | Grand Gulf  |
|---|---|
| Report | IR 05000416/2010005 Section 1R15 |
| Date counted | Dec 31, 2010 (2010Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | P Elkman G Guerra R Smith D Jones A Barrett T Burns D Overland V Gaddy R Latta J Draper S Hedger B Hagar R Kumana P Prescott D Norwood |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - Grand Gulf - IR 05000416/2010005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Grand Gulf) @ 2010Q4
Self-Identified List (Grand Gulf)
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