05000266/FIN-2008003-03
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Finding | |
|---|---|
| Title | Failure to Adequately Manage Online Risk for Breaker 1A52-16C Work |
| Description | A finding of very low safety significance and associated NCV of 10 CFR 50.65(a)(4), Requirements for Monitoring the Effectiveness of Maintenance at Nuclear Power Plants, was identified by the inspectors when the licensee failed to adequately manage the risk associated with work on the 480-VAC breaker 1B52-16C, coincident with a large number of other out-of-service components, which resulted in an unplanned risk condition for Unit 1 without the appropriate risk management actions. Specifically, the licensee incorrectly assumed that planned work on breaker 1B52-16C did not render the breaker unavailable, and that the breaker was not utilized in Modes 1, 2, or 3. Consequently, the component was not factored into the Safety Monitor online risk model. However, breaker 1B52-16C was in fact unavailable and also utilized in abnormal operating procedures for Modes 1, 2, and 3. Therefore, unavailability of the breaker was required to have been factored into Safety Monitor with appropriate risk management actions taken. The licensee took corrective actions to perform an apparent cause evaluation that identified the apparent cause of the issue and recommended a number of corrective actions to address the procedural and human performance deficiencies that were identified. The finding was determined to be more than minor because the finding was based on incorrect assumptions that changed the outcome of the risk assessment. The inspectors evaluated this finding using the Appendix K, Maintenance Risk Assessment and Risk Management Significance Determination Process, worksheets of IMC 0609 because the finding is a maintenance risk assessment issue. Flowchart 1, Assessment of Risk Deficit, requires the inspectors to determine the risk deficit associated with this issue. This finding was determined to be of very low safety significance because the incremental core damage probability deficit was less than 1E-6. The inspectors also determined that the finding has a cross-cutting aspect in the area of human performance. Specifically, the licensee failed to use conservative assumptions in decision-making and adopt a requirement to demonstrate that the proposed action was safe in order to proceed rather than a requirement to demonstrate that it is unsafe in order to disapprove the action H.1(b). (Section 1R13.1 |
| Site: | Point Beach  |
|---|---|
| Report | IR 05000266/2008003 Section 1R13 |
| Date counted | Jun 30, 2008 (2008Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.13 |
| Inspectors (proximate) | M Kunowski R Krsek S Ghasemian M Jones R Langstaff R Ruiz R Winter J Jandovitz T Bilik W Slawinski C Brown |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Point Beach - IR 05000266/2008003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Point Beach) @ 2008Q2
Self-Identified List (Point Beach)
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