05000336/FIN-2011003-03
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Finding | |
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| Title | Inadequate Corrective Action Results in Loss of Enclosure Building\'s Safety Function |
| Description | A self-revealing Green NCV of 10 CFR 50, Appendix B, Criterion XVl, Corrective Action, was identified for Dominion\'s failure to take prompt corrective action to address the cause of main steam safety valve (MSSV) exhaust pipe bushings not seating, which resulted in a loss of the Enclosure Building\'s safety function to control the release of radioactive material. Dominion took corrective action to clean and lubricate the MSSV exhaust pipe and also implemented a modification to upgrade the MSSV outlet boot and qualify it as part of the Enclosure Building filtration boundary (cR420485). The finding was more than minor because it was associated with the Procedure Quality attribute of the Barrier Integrity cornerstone and affected the cornerstone objective to provide reasonable assurance that physical design barriers protect the public from radionuclide releases caused by accidents or events. Specifically, the failure of the MSSV sliding bushings to seat properly caused the Enclosure Building Filtration System (EBFS) to fail its surveillance test, and its safety function to control the release of radioactive material could not be assured. The inspectors conducted a Phase 1 screening in accordance with NRC Inspection Manual Chapter (lMC) Attachment 0609.04, Phase 1 - Initial Screening and Characterization of Findings, and determined that the finding was of very low safety significance (Green) because it only represents a degradation of the radiological barrier function provided for the auxiliary building. The inspectors determined that this finding had a cross-cutting aspect in the Problem ldentification and Resolution cross-cutting area, Corrective Action Program component, because Dominion did not take appropriate corrective action to address the Enclosure Building surveillance test failure in 2009. |
| Site: | Millstone  |
|---|---|
| Report | IR 05000336/2011003 Section 4OA3 |
| Date counted | Jun 30, 2011 (2011Q2) |
| Type: | NCV: Green |
| cornerstone | Barrier Integrity |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | T Moslak D Jackson M Modes B Haagensen J Krafty S Shaffer |
| CCA | P.3, Resolution |
| INPO aspect | PI.3 |
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Finding - Millstone - IR 05000336/2011003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Millstone) @ 2011Q2
Self-Identified List (Millstone)
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