05000390/FIN-2012002-03
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Finding | |
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| Title | Failure to Comply with Technical Specification 3.8.4, 3.8.5 and 3.0.3 by Failing to Recognize Vital Batteries Iii and Iv Degradation |
| Description | A Green, NRC-identified NCV of TS 3.8.4, DC Sources Operating, was identified. The licensees failure maintain TS operability by accurately identifying that vital battery III was approaching end-of-life was a performance deficiency. It is more than minor because, if left uncorrected, it could lead to a more serious safety concern, that of loss of functionality. Additionally, the finding was associated with the equipment performance attribute of the Mitigating Systems cornerstone and affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). Using IMC 0609, Significance Determination Process, Attachment 4, Phase 1 - Initial Screening and Characterization of Findings, the finding was determined to be of very low safety significance (Green), because subsequent functional testing by the licensee, witnessed by the inspectors, showed that vital batteries III and IV would meet all design basis analysis requirements. This finding was determined to have a cross-cutting aspect in the area of human performance associated with the decision-making component. The licensee failed to use conservative assumptions in decision making and to adopt a requirement to demonstrate that the proposed action is safe in order to proceed rather than a requirement to demonstrate that it is unsafe in order to disapprove the action. |
| Site: | Watts Bar  |
|---|---|
| Report | IR 05000390/2012002 Section 4OA3 |
| Date counted | Mar 31, 2012 (2012Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | R Monk S Shaeffer K Miller |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Watts Bar - IR 05000390/2012002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Watts Bar) @ 2012Q1
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