05000346/FIN-2010002-03
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Finding | |
|---|---|
| Title | Inoperability of Steam-Feedwater Rupture Control System |
| Description | The inspectors reviewed the licensees determination that the failure of the of steam-feedwater rupture control system (SFRCS) channel 4, which also was determined to affect channel 3, was not reportable under 10 CFR 50.72 because the issue was found during a mode in which the equipment was not required to be operable. The inspectors did not complete their review of the licensees notification determination. Additionally, the inspectors did not complete their review of the consequences of the reported failure. The issues are considered a URI pending further review by the licensees staff and the inspectors. On March 2, 2010, after performance of the integrated safety features actuation system test, the licensee identified that SFRCS channel 4 had energized in a blocked condition. With such a condition existing, the licensee stated the channel could fail to operate correctly after a loss of offsite power. Subsequently, the licensee also determined that SFRCS channel 3 could also experience this condition and potentially result in auxiliary feedwater being supplied to a ruptured steam generator. In CR 10-73067 the licensee determined that the condition resulted in an unanalyzed condition that significantly degraded plant safety but that no 10 CFR 50.72 report was required because at the time of discovery the plant was in Mode 5 and SFRCS was not required to be operable. The licensee additionally documented the equipment conditions in CR 10-72446 and CR 10-72688. A root cause report was prepared as part of CR 10-73076. The root cause was issued for final site review on March 31, 2010. At the end of the inspection period the inspectors had not completed their review of the licensees reportability determination and the root cause report. Pending further review of the licensees evaluation and supporting documentation by the inspectors, the issue is considered an unresolved item (URI) 05000346/20100002-03, Inoperability of Steam-Feedwater Rupture Control System |
| Site: | Davis Besse  |
|---|---|
| Report | IR 05000346/2010002 Section 1R15 |
| Date counted | Mar 31, 2010 (2010Q1) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | J Cassidy D Melendez-Colon J Rutkowski D Jones A Wilson T Go J Cameron P Vossb Palagij Rutkowski D Passehl A Wilson R Walton R Russell J Cameron E Stamm |
| INPO aspect | |
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Finding - Davis Besse - IR 05000346/2010002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Davis Besse) @ 2010Q1
Self-Identified List (Davis Besse)
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