05000259/FIN-2009005-04
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Finding | |
|---|---|
| Title | Unit 2 RCIC System Inoperable Beyond the Technical Specification Allowed Outage Time |
| Description | A Green self-revealing non-cited violation of Unit 2 Technical Specifications (TS) Limiting Condition for Operation 3.5.3, Reactor Core Isolation Cooling (RCIC) System, was identified for the licensees failure to comply with the TS required actions for an inoperable RCIC system. The RCIC system was inoperable for approximately 33 days due to an internal failure of the electric governor - magnetic (EG-M) controller, which exceeded the TS allowed outage time (AOT) of 14 days. This issue was entered into the corrective action program as Problem Evaluation Report 203537. The EG-M was replaced and the RCIC system was restored to an operable condition. This finding was determined to be of greater than minor significance because it was associated with the Equipment Performance attribute of the Mitigating Systems Cornerstone and adversely affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events. Specifically, the unresolved failure of the RCIC EG-M resulted in the RCIC system being unable to perform its intended function for an extended period of time (i.e., 33 days). In accordance with IMC 0609, Significance Determination Process (SDP), Attachment 4, Phase 1 - Initial Screening and Characterization of Findings, this finding required a Phase 2 analysis since it represented an actual loss of a single train for greater than its TS AOT. The Phase 2 SDP analysis determined that the finding was potentially greater than Green (i.e., greater than very low safety significance). A regional Senior Reactor Analyst then performed a Phase 3 SDP analysis which subsequently concluded the finding was of very low safety significance or Green. The cause of this finding was directly related to the crosscutting aspect of Prompt Identification of Issues in the Corrective Action Program in the Problem Identification and Resolution area, because the licensee failed to enter the identified problem regarding abnormal EG-M voltage into their corrective action program in order to evaluate and resolve the adverse impact of the abnormal EG-M voltage on RCIC system operability P.1(a) |
| Site: | Browns Ferry  |
|---|---|
| Report | IR 05000259/2009005 Section 4OA3 |
| Date counted | Dec 31, 2009 (2009Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | C Stancil T Ross H Gepford E Guthrie L Miller K Korth |
| CCA | P.1, Identification |
| INPO aspect | PI.1 |
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Finding - Browns Ferry - IR 05000259/2009005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Browns Ferry) @ 2009Q4
Self-Identified List (Browns Ferry)
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