05000528/FIN-2005012-06
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Finding | |
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| Title | Summary Finding. 95002 Inspectors Assessment of Ir2004-14 (YELLOW) 10CFR50, App B, Criterion Iii Violation |
| Description | The NRC performed this supplemental inspection, in part, to assess the licensee's evaluation and corrective actions associated with potential air entrainment into the emergency core cooling system. The licensee failed to incorporate original design requirements into the plant to maintain piping between the containment sump isolation valves filled with water. This performance issue was previously characterized as a 10 CFR 50, Appendix B, Criterion III, violation having substantial safety significance (Yellow), and was originally identified in NRC Inspection Report 05000528; 529; 530/2004014. The inspectors determined that the licensee's evaluation identified a direct cause, nine root causes, and nine contributing causes of the performance issue. The evaluation was also used to develop an extensive list of corrective actions. The inspectors found the licensee's methods of evaluation to be appropriate.
The NRC concluded that, while the licensee performed an adequate root cause evaluation of the Design Control violation, certain corrective actions were incomplete at the time of this inspection. Specifically, the team determined that for each of the root and contributing causes, not all corrective actions were sufficiently developed to ensure that the identified performance deficiencies were adequately addressed. In addition, some of the corrective actions were narrowly focused, or the implementation of those actions was not fully effective. Also, the team concluded that criteria and reviews were not established, for auditing or followup, to ensure that corrective actions were effective in improving performance in the affected areas. Consequently, the team did not have assurance that the planned corrective actions were sufficient to address the causes for the performance deficiencies associated with the violation. Therefore, the (Yellow) violation (VIO 2004/014-01) will remain open for further NRC review. |
| Site: | Palo Verde  |
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| Report | IR 05000528/2005012 Section 4OA5 |
| Date counted | Dec 31, 2005 (2005Q4) |
| Type: | Finding: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | B Mallett C Baron D Proulx J Clark J Groom M Hay M Sitek S Sheldon |
| INPO aspect | |
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Finding - Palo Verde - IR 05000528/2005012 | |||||||||||||||||||||||||
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Finding List (Palo Verde) @ 2005Q4
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