05000260/FIN-2010005-01
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Finding | |
|---|---|
| Title | RHR Subsystem Inoperable Beyond the TS Allowed Outage Time |
| Description | A self-revealing Apparent Violation (AV) of Unit 1 Technical Specifications (TS) Limiting Condition for Operations (LCO) 3.5.1, Emergency Core Cooling System (ECCS) - Operating, was identified for the licensees failure to comply with the TS LCO required actions for an inoperable Residual Heat Removal (RHR) and Low Pressure Coolant Injection (LPCI) subsystem due to a failure of the RHR Loop II LPCI Outboard Injection Valve (1-FCV-74-66) to open. The licensee entered this issue into their corrective action program as problem evaluation report (PER) 271338. The 1-FCV-74-66 was subsequently repaired and returned to service during the Unit 1 outage prior to restart. This finding has potential safety significance greater than very low safety significance (Green) and will remain indeterminate pending completion of the significance determination process. The inspectors determined that the licensees failure to establish adequate design control and perform adequate maintenance on the Unit1 outboard LPCI injection valve, 1-FCV-74-66, which resulted in the valve being left in a significantly degraded condition and RHR loop II unable to fulfill its safety function, was a performance deficiency. This finding was considered more than minor because it was associated with the Protection Against External Factors attribute of the Reactor Safety/ Mitigating Systems Cornerstone and adversely affected the cornerstone objective of ensuring availability and reliability of systems designed to respond to initiating events to prevent undesirable consequences. Specifically, the RHR subsystem was rendered incapable of being aligned to perform its safe shutdown function due to the failure of 1-FCV-74-66. The safety characterization of this finding is not yet finalized and is currently characterized as To Be Determined (TBD). This finding does not have a cross-cutting aspect because it is not reflective of current licensee performance in the last three years. |
| Site: | Browns Ferry  |
|---|---|
| Report | IR 05000260/2010005 Section 1R20 |
| Date counted | Dec 31, 2010 (2010Q4) |
| Type: | Finding: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.2 |
| Inspectors (proximate) | H Campbell R Zimmermana Rogersc Kontz C Stancil E Guthrie E Lea G Johnson J Wray L Jarriel L Pressley M King P Niebaum R Baldwin T Ross |
| INPO aspect | |
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Finding - Browns Ferry - IR 05000260/2010005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Browns Ferry) @ 2010Q4
Self-Identified List (Browns Ferry)
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