05000336/FIN-2015012-03
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Finding | |
|---|---|
| Title | Procedure Failed to Direct Adequate Venting of SDC System |
| Description | A self-revealing Green NCV of Millstone Power Station Unit No. 2 TS 6.8.1, Procedures, was identified because the procedure used by Dominion to place the SDC system in service did not verify that the SDC suction line to the LPSI pumps was filled and vented prior to placing the system in service which appears to be the likely cause for opening SDC suction Relief Valve (RV) 2-SI-468. To address this issue, Dominion revised the procedure to include venting at SI-075 as part of step 4.12.2 of OP 2207. Dominion entered this issue into their corrective action program as CR1011898. The finding was more than minor because it was associated with procedure quality attribute of the Initiating Events cornerstone and affected the cornerstone objective of limiting the likelihood of events that upset plant stability and challenge critical safety functions during shutdown operations. Specifically, the finding identifies an increase in the likelihood of a loss of SDC resulting from the unexpected opening of RV 2-SI-468. Using a bounding and conservative quantitative detailed risk analysis, coupled with deterministic risk-informed defense-in-depth considerations, the finding was determined to be of very low risk significance (Green). This finding had a cross-cutting aspect in the area of Human Performance, Resources, because Dominion did not ensure procedures were adequate to support nuclear safety. Specifically, the plant cooldown procedure did not ensure that the SDC suction line to the LPSI pumps was full of water prior to placing the system in service [H.1]. |
| Site: | Millstone  |
|---|---|
| Report | IR 05000336/2015012 Section 4OA5 |
| Date counted | Dec 31, 2015 (2015Q4) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 93812 |
| Inspectors (proximate) | B Haagensen C Cahill D Jackson D Silk E Gray F Arner K Mangan P Presby T Daun W Cook |
| Violation of: | Technical Specification Technical Specification - Procedures |
| CCA | H.1, Resources |
| INPO aspect | LA.1 |
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Finding - Millstone - IR 05000336/2015012 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Millstone) @ 2015Q4
Self-Identified List (Millstone)
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