05000456/FIN-2016001-05
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Finding | |
|---|---|
| Title | Failure to Ensure Unit 2 Startup Feedwater Pump Availability |
| Description | The inspectors identified a finding of very low safety significance when licensee personnel failed to ensure that the Unit 2 startup feedwater pump (SUFWP) was available during an 18 month operating cycle. Specifically, the licensee had failed to ensure that the pump oil pressure regulator was properly adjusted, and had failed to perform a post-maintenance test following on-line work in a manner to ensure that no new deficiency was introduced. The license entered this issue into their CAP as IR 2565442. Corrective actions consisted of updating the station SUFWP model work orders (WOs) to ensure that interlock continuity checks were performed as a part of the post-maintenance testing when necessary, and to include procedural steps to verify lube oil pressure when starting a SUFWP. The inspectors determined that the performance deficiency was more than minor because the issue was associated with the Procedural Quality attribute of the Mitigating Systems cornerstone and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the Unit 2 SUFWP is a backup method of decay heat removal following a reactor trip, and is utilized in plant startup and shutdown procedures. A detail risk evaluation was performed and the performance deficiency was determined to be of very low safety significance based upon an evaluation bounding the risk to a Delta Core Damage Frequency (CDF) of 2.9E7/year. No cross-cutting aspect was identified because the cause of the failure were probable causes and not confirmed to be the actual cause. |
| Site: | Braidwood  |
|---|---|
| Report | IR 05000456/2016001 Section 4OA5 |
| Date counted | Mar 31, 2016 (2016Q1) |
| Type: | Finding: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71150 |
| Inspectors (proximate) | C Hunt D Betancourt E Duncan G Hausman J Benjamin M Doyle N Feliz-Adorno T Go D Sargis |
| INPO aspect | |
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Finding - Braidwood - IR 05000456/2016001 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Braidwood) @ 2016Q1
Self-Identified List (Braidwood)
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