05000298/FIN-2012005-04
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Finding | |
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Title | Failure to Consider All Relevant Information and Appropriately Assess Operability when a Degraded Nonconforming Condition was Identified |
Description | The inspectors identified a non-citied violation of 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, associated with the licensees failure to follow the requirements of Station Procedure 0.5OPS, Operations Review of Condition Reports/Operability Determination, Revision 38, and properly document the basis for operability when a degraded or nonconforming condition is identified. Specifically, the inspectors identified that the licensee had failed to consider all relevant information when assessing operability of diesel generator 2, supported by service water system Division II, with service water system Division I hatches removed for Zurn strainer A replacement during design basis cold weather temperature of -5 degrees Fahrenheit with a loss of off-site power. The licensee entered these issues into their corrective action program for resolution as Condition Reports CR-CNS-2012-08148 and CR-CNS-2012-08292. The licensees failure to consider all relevant information and appropriately assess operability when a nonconforming condition was identified was a performance deficiency. This performance deficiency was determined to be more than minor, and is therefore a finding, because it was associated with the equipment performance attribute of the Mitigating Systems Cornerstone, in that the inadequate operability determination failed to identify the number of temporary heaters and their power supplies that would be necessary to maintain Division II of the service water system functional to support operability of diesel generator 2, during a loss of offsite power coincident with the licensing basis cold weather conditions, and thereby affecting the associated cornerstone objective to ensure availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The inspectors evaluated the finding using Inspection Manual Chapter 0609, Appendix G, Shutdown Operations Significance Determination Process, Checklist 7, BWR Refueling Operation with RCS Level > 23\\\', and determined that the finding is of very low safety significance (Green) because the finding did not require a quantitative risk assessment because adequate mitigating equipment remained available and the finding did not constitute a loss of the diesel generator capable of supplying one division of the onsite safety related power distribution subsystems, as defined in Appendix G. The inspectors determined that the apparent cause of this finding was that operators had failed to verify their assumptions associated with the compensatory measures to maintain service water system Division II function and support operability of diesel generator 2. Therefore, the finding has a crosscutting aspect in the area of human performance associated with the decision-making component because the licensee failed to use conservative assumptions in decision-making and adopt a requirement to demonstrate that the proposed action is safe in order to proceed rather than a requirement to demonstrate it is unsafe in order to disapprove the action. |
Site: | Cooper |
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Report | IR 05000298/2012005 Section 1R15 |
Date counted | Dec 31, 2012 (2012Q4) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.15 |
Inspectors (proximate) | J Melfi J Josey J Laughlin D Proulx T Buchanan N Greene T Farina C Henderson S Garchow |
CCA | H.14, Conservative Bias |
INPO aspect | DM.2 |
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Finding - Cooper - IR 05000298/2012005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Cooper) @ 2012Q4
Self-Identified List (Cooper)
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