05000354/FIN-2011004-03
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | In Modes 1, 2, and 3, Hope Creek TS 3.4.2.1 , Safety Relief Valves, requires that 13 of the 14 SRVs open within +/-3 percent of the specified code safety valve function lift settings or else be in Mode 3 within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in Mode 4 within the next 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Contrary to this requirement, PSEG identified between November 2 and November 29,2010, that six of the 14 SRVs were determined to have their as-found set points in excess of the TS allowable tolerance, thus leaving eight operable SRVs. PSEG replaced the pilot assembly for each of the 14 SRVs with a fully tested spare assembly. ln addition as discussed in Section 4OA3, PSEG determined that the apparent cause for 5 of the 6 SRV setpoint failures was corrosion bonding/sticking of the pilot disc. Therefore PSEG is also currently evaluating replacing the SRVs with a design not susceptible to corrosion bonding through the plant modification process. PSEG entered this issue into their CAP as notifications 20483383 and 20525076. This TS violation was associated with the Mitigating Systems cornerstone but PSEG determined, through engineering analyses that, given a design bases event, postulated piping stresses would not have exceeded allowable limits with 6 of 14 SRVs inoperable and the SRVs would have functioned to prevent a reactor vessel over-pressurization. Therefore, this finding was of very low safety significance (Green) based on a Phase 1 SDP screening, because it did not represent an actual loss of system safety function, and was not potentially risk significant for external events. The LERs associated with the event are documented in Section |
| Site: | Hope Creek  |
|---|---|
| Report | IR 05000354/2011004 Section 4OA7 |
| Date counted | Sep 30, 2011 (2011Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | A Patel F Bower A Burritt J Hawkins C Douglas P Kaufman J Schoppy J Furia |
| INPO aspect | |
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Finding - Hope Creek - IR 05000354/2011004 | |||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Hope Creek) @ 2011Q3
Self-Identified List (Hope Creek)
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