05000336/FIN-2013002-01
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Finding | |
|---|---|
| Title | Inadequate Post Maintenance Testing Following PORV Maintenance |
| Description | The inspectors identified a Green NCV of 10 CFR 50 Appendix B, Criterion XI, Test Control, for Dominions failure to perform an adequate post maintenance test (PMT) on 2-RC- 404, the Unit 2 B power operated relief valve (PORV). Specifically, a stroke test of the valve under hot conditions was not performed prior to entering Mode 3. Since the valve was observed to be leaking, Dominion cooled down the plant to repair the PORV and performed the specified PMTs including the valve stroke under hot conditions. Dominion entered the issue into their corrective action program (CAP), CR506539. The finding is more than minor because it is associated with the Human Performance attribute of the Mitigating Systems cornerstone and affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, Dominions PMT of the PORV did not adequately demonstrate the valves capability to stroke under all operating conditions. The finding was of very low safety significance (Green) because the finding did not represent an actual loss of system safety function, did not represent an actual loss of safety function of a single train for greater than its technical specification (TS) allowed outage time, did not represent an actual loss of function of one or more non-technical specification trains of equipment designated as high safety-significant in accordance with Dominions maintenance rule program for greater than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, and did not involve a loss or degradation of equipment designed to mitigate a seismic, flooding, or severe weather initiating event. The finding had a cross-cutting aspect in Human Performance, Work Control, because Dominion did not adequately incorporate actions to address the impact of work activities on plant operation. Specifically, Dominion incorrectly concluded that the PORV functional test was not required prior to entering Mode 3. |
| Site: | Millstone  |
|---|---|
| Report | IR 05000336/2013002 Section 4OA2 |
| Date counted | Mar 31, 2013 (2013Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | B Haagensen J Krafty J Laughlin R Bellamy J Ambrosini |
| Violation of: | Technical Specification 10 CFR 50 Appendix B Criterion XI |
| CCA | H.5, Work Management |
| INPO aspect | WP.1 |
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Finding - Millstone - IR 05000336/2013002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Millstone) @ 2013Q1
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