05000255/FIN-2011002-05
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Finding | |
|---|---|
| Title | None |
| Description | In July of 2010, the licensee identified that the neutron fluence limit for the reactor vessel would be reached as soon as May 2011. Previously, the licensee believed that the limit would be reached in 2014. The licensee determined that the change resulted from the incorrect determination of fluence limits in the governing document for reactor vessel monitoring. The inspectors concluded that the failure to include correct limits for vessel fluence in governing procedures was a violation of 10 CFR 50 Appendix B, Criterion V. Criterion V requires, in part, that activities affecting quality be prescribed by procedures appropriate to the circumstances. Contrary to this requirement, the site procedure was not appropriate to the circumstances in that it contained incorrect fluence limits. Based on corrected fluence limits, the licensee determined that the curves were valid until May 2011. Further analysis by the licensee provided sufficient basis to extend applicability of the pressure-temperature curves until March 2012. The licensee has submitted a license amendment that uses recent changes to American Society of Mechanical Engineering code to revise the pressure temperature curves to extend the time further. The inspectors determined that the failure to properly monitor vessel fluence was a performance deficiency that warranted a significance determination. The inspectors concluded that the issue was more than minor because, if left uncorrected, the licensee would have operated without a valid analysis to support the pressure/temperature limits. Since the licensee identified and corrected the analysis before invalidating the existing analysis, the inspectors concluded the finding was not of more than very low safety significance. The licensee entered this condition into their CAP as CR-PLP-2010-3252. |
| Site: | Palisades  |
|---|---|
| Report | IR 05000255/2011002 Section 4OA7 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | J Cassidy J Ellegood T Taylor |
| INPO aspect | |
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Finding - Palisades - IR 05000255/2011002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Palisades) @ 2011Q1
Self-Identified List (Palisades)
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