05000286/FIN-2015010-01
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Finding | |
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| Title | Failure to Correct a Degraded Condition of Fire Protection System Solenoid Valve SOV-230-1 |
| Description | The inspectors identified a Green NCV of Condition 2.H of the Indian Point Unit 3 Facility Operating License DPR-64, Fire Protection Program, for failure to promptly identify, report, and correct a condition adverse to fire protection. Specifically, solenoid valve (SOV)-230-1, associated with the deluge valve for the 32 main transformer (MT), was documented to have opened during its 2-year deluge activation tests on April 7, 2011, April 2, 2013, and March 24, 2015, but did not close as designed after the deluge system actuated. This condition was not corrected, and recurred on May 9, 2015, when the deluge system actuated in response to a fire on the 31 MT. Entergy entered this issue into the corrective action program (CAP) (condition report (CR)-IP3-2015-02921), and determined a clogged orifice in the SOV pressure switch prevented the SOV from de-energizing and going closed. The performance deficiency was determined to be more than minor because it is associated with the Protection Against External Factors attribute of the Mitigating Systems cornerstone and adversely affected the cornerstones objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, water intrusion into the switchgear room can challenge the reliability of the safety-related electrical equipment required to respond to a reactor transient. The inspectors screened the finding for significance using the screening questions in IMC 0609, Appendix A, Exhibit 2, Mitigating Systems, and Exhibit 4, External Events, and determined that this performance deficiency required a Detailed Risk Evaluation because the potential existed for enough water leakage into the switchgear room to cause a loss of all safety-related power and station blackout (SBO) condition. The Detailed Risk Evaluation determined that this finding was of very low safety significance (Green) with an estimated increase in core damage frequency in the low E-7 per reactor year range (an increase of 1 in 10 million reactor years). The inspectors determined the finding had a cross-cutting aspect in the Human Performance cross-cutting area, Challenge the Unknown, because Entergy did not stop and fully explore an uncertain condition with SOV-230-1 when it failed to closed on three occasions since April 2011. Entergy replaced the SOV, but did not determine that the cause was a clogged pressure switch orifice until after the May 9, 2015, 31 MT fire event. |
| Site: | Indian Point  |
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| Report | IR 05000286/2015010 Section 4OA5 |
| Date counted | Jun 30, 2015 (2015Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 93812 |
| Inspectors (proximate) | T Setzer W Schmidt A Burritt R Fuhrmeister S Rich |
| Violation of: | License Condition - Fire Protection |
| CCA | H.11, Challenge the Unknown |
| INPO aspect | QA.2 |
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Finding - Indian Point - IR 05000286/2015010 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Indian Point) @ 2015Q2
Self-Identified List (Indian Point)
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