05000298/FIN-2013002-02
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Finding | |
|---|---|
| Title | Failure to Maintain Design Control of the Internal Flooding Analysis |
| Description | The inspectors identified a Green non-cited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, associated with the licensees failure to assure that the applicable design basis requirements, associated with the stations internal flooding analysis in response to a medium energy line break, were correctly translated into the plant design. Specifically, the licensee used incorrect assumptions for a time critical operator action, and this resulted in a nonconservative analysis for a moderate energy line break in the 903 feet control building corridor. The licensee entered this deficiency into their corrective action program for resolution as Condition Reports CR-CNS-2013-00579, CR-CNS-2013-00619, and CR-CNS-2013-01553. The failure to maintain design control with respect to the internal flooding analysis was a performance deficiency. This performance deficiency was more than minor, and therefore a finding, because it was associated with the design control attribute of the Mitigating Systems Cornerstone. Specifically,the licensees failure to use correct assumptions for time-critical operator actions resulted in a nonconservative analysis for a moderate energy line break in the 903-foot control building corridor, thereby affecting the associated cornerstone objective to ensure availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Using Inspection Manual Chapter 0609, Appendix A, The Significance Determination Process for Findings At-Power, the inspectors determined that the finding was of very low safety significance (Green) because the finding: (1) was not a deficiency affecting the design or qualification of a mitigating structure, system, or component, and did not result in a loss of operability or functionality; (2) did not represent a loss of system and/or function; (3) did not represent an actual loss of function of at least a single train for longer than its technical specification allowed outage time, or two separate safety systems out-of-service for longer than their technical specification allowed outage time; and (4) did not represent an actual loss of function of one or more nontechnical specification trains of equipment designated as high safety-significance in accordance with the licensees maintenance rule program. The finding has a cross-cutting aspect in the area of problem identification and resolution associated with the corrective action program component because the licensee failed to thoroughly evaluate problems such that the resolutions address the causes. |
| Site: | Cooper  |
|---|---|
| Report | IR 05000298/2013002 Section 1R06 |
| Date counted | Mar 31, 2013 (2013Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.06 |
| Inspectors (proximate) | C Henderson C Hale J Josey J Laughlin D Proulx E Uribe J Gilliam |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control Technical Specification |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - Cooper - IR 05000298/2013002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Cooper) @ 2013Q1
Self-Identified List (Cooper)
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