05000334/FIN-2010005-01
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Finding | |
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| Title | Premature Lifting of ECCS Relief Valve RV-1 SI-8458 |
| Description | An unresolved item (URI) was identified because additional information regarding the existence of adverse nozzle loads affecting, and the as-found testing and inspection results of, the set point of Unit 1 relief valve RV-1-SI-8456 is required to determine whether a performance deficiency existed which contributed to its premature lifting. The inspectors will review the additional information after the relief valve is removed and the valve and associated pipe alignment is inspected. As reported by FENOC on November 16, 2010 (Event Notification 46421), and LER 05-334/2010-003-00, Unit 1 Low Head Safety Injection (LHSI) system relief valve RV- 1SI-8456 unexpectedly lifted during planned testing of the \\\'A\\\' LHSI pump. The relief valve properly reseated and cycled open only during pump operation. The condition revealed itself during surveillance testing by an unexpected sump alarm and lowering of the refueling water storage tank level. FENOC evaluated the impact to the LHSI safety function and the control room envelope. FENOC also determined that the relief valve could be gagged closed and still maintain LHSI system protection and testing capability with the remaining two relief valves and additional compensatory measures. This relief valve had been installed during the most recent refueling outage and post-maintenance tested satisfactorily. FENOC entered the issue into their CAP as CR 10-85863 and conducted a root cause analysis and concluded the most probable cause was nozzle loading effects from possible LHSI piping misalignment. FENOC plans to remove the valve and inspect it and the piping alignment at the earliest acceptable plant condition to continue its investigation. The inspectors will review the additional information of the as-found condition of the relief valve and the associated LHSI piping alignment to determine if a performance deficiency exists. |
| Site: | Beaver Valley  |
|---|---|
| Report | IR 05000334/2010005 Section 1R15 |
| Date counted | Dec 31, 2010 (2010Q4) |
| Type: | NCV: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | D Werkheiser E Bonney P Kaufman R Bellamy T Moslaka Dugandzicc Crisden D Spindler E Bonney G Hunegs J Laughlin P Kaufman S Barber S Barr T Moslak T Ziev |
| INPO aspect | |
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Finding - Beaver Valley - IR 05000334/2010005 | |||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Beaver Valley) @ 2010Q4
Self-Identified List (Beaver Valley)
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