05000305/FIN-2012004-02
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Finding | |
|---|---|
| Title | Inadequate Degradation Evaluation of Leaking Refueling Water Storage Tank |
| Description | The inspectors identified a finding of very low safety significance and associated NCV of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the licensees failure to adequately evaluate a through-wall flaw in the refueling water storage tank (RWST). Specifically, the licensee failed to perform a degradation growth evaluation as required by ASME Code Case (CC) N-705, Section 2.5, and failed to use the appropriate acceptance criteria as required by CC N-705, Section 5, in their operability determination (OD) of the leaking RWST. The licensee subsequently took corrective actions to revise the RWST OD 492 to include the CC N-705, Section 2.5-required calculation of the degradation growth considering all the appropriate acceptance criteria described in CC N-705, Section 5. The licensees final revision to the POD adequately calculated the allowable time (Tallow) for RWST operation per CC N-705 to be ~25 months. This issue was entered into the licensees CAP as CR482703. The finding was determined to be more than minor, and determined to be a performance deficiency, because if left uncorrected, it could become a more significant safety concern. This finding was associated with the Mitigating Systems Cornerstone attribute of Equipment Performance (reliability), and adversely affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The inspectors determined the finding could be evaluated using the SDP in accordance with IMC 0609, Significance Determination Process, Attachment 0609.04, Initial Characterization of Findings, dated June 19, 2012 and Appendix A, The Significance Determination Process (SDP) for Findings At-Power Exhibit 2, Mitigating Systems Screening Questions, dated June 19, 2012. Because the licensee intended to repair/replace the RWST weld during the next RFO, the inspectors answered No to all of the Mitigating Systems Screening questions, and screened the finding screened as having very low safety significance (Green). This finding has a cross-cutting aspect in the area of human performance, resources, because the licensee did not ensure that personnel, equipment, procedures, and other resources were available and adequate to assure nuclear safety, particularly those necessary for maintaining long-term plant safety by maintenance of design margins. Specifically, the licensee failed to provide adequate resources to verify the adequacy of the RWST degradation evaluation and supporting calculations. The inspectors determined the primary cause of this finding based upon discussions with the licensees engineering staff. |
| Site: | Kewaunee  |
|---|---|
| Report | IR 05000305/2012004 Section 1R15 |
| Date counted | Sep 30, 2012 (2012Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | R Winter K Riemer J Jandovitz R Krsek V Meghani K Barclay A Shaikh V Myers |
| CCA | H.6, Design Margins |
| INPO aspect | WP.2 |
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Finding - Kewaunee - IR 05000305/2012004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Kewaunee) @ 2012Q3
Self-Identified List (Kewaunee)
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