05000269/FIN-2010005-04
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Finding | |
|---|---|
| Title | Potential Inoperability of the Unit 3 Standby Shutdown Facility Reactor Coolant Makeup Pump |
| Description | During the performance of a quarterly In-service Testing surveillance test of the Unit 3 SSF RCM pump on August 24, 2010, the licensee observed an increase in the normal reactor building sump level and subsequently found to have been caused by seat leakage in relief valve 3HP-404. It was identified that while leakage during the test was less than 0.5 gpm, a gradual increase in leakage through the relief valve had occurred during tests performed over the preceding 13 months. The SSF RCM Pump was used to provide makeup to the reactor coolant system (RCS) and RCP seal cooling during an SSF-design basis event. Leakage through the relief valve would reduce the amount of water that would reach the RCS and could result in RCP seal failure or the inability of operators to control RCS inventory if the relieve valve leakage continued to increase. The licensee will conduct testing to determine if the leakage rate would degrade enough over the 72-hour mission time of the SSF to prevent the SSF RCM pump from performing its safety function. The licensee has replaced the relief valve. This issue is identified as URI 05000287/2010005-04: Potential Inoperability of the Unit 3 Standby Shutdown Facility Reactor Coolant Makeup Pump. |
| Site: | Oconee  |
|---|---|
| Report | IR 05000269/2010005 Section 1R22 |
| Date counted | Dec 31, 2010 (2010Q4) |
| Type: | URI: |
| cornerstone | No Cornerstone |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.22 |
| Inspectors (proximate) | A Sabisch A Vargas B Collins C Rapp G Ottenberg J Bartley J Hamman K Ellis R Carriona Sabischg Ottenberg C Even J Hamman M Coursey K Ellis J Bartley J Rivera-Ortiz |
| INPO aspect | |
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Finding - Oconee - IR 05000269/2010005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Oconee) @ 2010Q4
Self-Identified List (Oconee)
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