05000298/FIN-2010002-02
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Finding | |
|---|---|
| Title | Inadequate Service Water Pump Room Loss of Heat Calculation |
| Description | The inspectors identified a noncited violation of 10 CFR, Part 50, Appendix B, Criterion III, Design Control, for the licensees use of an incorrect post-accident service water flow rate in the design basis calculation of record. Calculation NEDC 91-232 determined the minimum service water pump room temperature following a loss of offsite power. The minimum service water flow during accident conditions is used to derive the heat input into the room by the service water pump motors. The calculation incorrectly assumed a value for the post-accident service water flow rate that was less conservative than the value defined in the updated final safety analysis report. In response to the inspectors concerns, the licensee initiated Condition Report CR-CNS-2009-10389 and revised the affected calculation. The inspectors determined that this performance deficiency was sufficiently similar to the not-minor-if description of Example 3.a, 3.l, 3.j and 3.k of Manual Chapter 0612, Appendix E, Examples of Minor Issues due to the fact the effected calculation had to be re-performed to demonstrate the operability of the service water system. As such, the inspectors determined that the finding was more than minor because it was associated with the design control attribute of the mitigating systems cornerstone, and adversely affected the cornerstone objective to ensure the availability, reliability and capability of systems that respond to mitigating events to prevent undesirable consequences. The inspectors determined that this performance deficiency was dissimilar from any other examples in Manual Chapter 0612, Appendix E. Using the Manual Chapter 0609 Exhibit 1, Initial Screening and Characterization of Findings, the issue screened as having very low safety significance because it was a design deficiency confirmed not to result in loss of operability in accordance with NRC Manual Chapter Part 9900, Technical Guidance, Operability Determination Process for Operability and Functional Assessment. The inspectors determined that no cross cutting aspect was applicable to this performance deficiency because the calculation error is not reflective of current performanc |
| Site: | Cooper  |
|---|---|
| Report | IR 05000298/2010002 Section 4OA2 |
| Date counted | Mar 31, 2010 (2010Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | N Taylor P Elkmann C Graves D Stearns V Gaddy M Chambers D Reinert |
| INPO aspect | |
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Finding - Cooper - IR 05000298/2010002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Cooper) @ 2010Q1
Self-Identified List (Cooper)
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