05000528/FIN-2013002-06
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | Title 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, requires, in part, that activities affecting quality be prescribed by documented instructions, procedures, or drawings, of a type appropriate to the circumstances and be accomplished in accordance with these instructions, procedures, or drawings. Contrary to the above, prior to November 8, 2012, the licensee failed to prescribe heat exchanger visual inspection procedures of a type appropriate to the circumstances. Specifically, on November 8, 2012, during a scheduled occupational safety area walkdown, the licensee identified through-wall leakage on the outside of a Unit 3 spray pond system drain line on the train A essential cooling water heat exchanger. The licensee declared the Unit 3 train A spray pond system inoperable and began actions to make immediate repairs. The licensees subsequent apparent cause investigation determined that pre-existing coating defects were likely present and the corrosion process had begun prior to the most recent visual inspection. The investigation also concluded that procedures for visual inspection of heat exchangers were inadequate in that they did not explicitly mentioned the need to inspect nozzles as potential areas subject to localized corrosion. Therefore, the pre-existing flaw in the Unit 3 drain nozzle had gone undetected during previous visual inspections. The licensee revised their heat exchanger visual inspection procedure to identify small heat exchanger nozzles as an area requiring additional emphasis and requiring documentation of nozzle inspection results. The inspectors concluded that the finding is of very low safety-significance (Green) because the as-found nozzle wall flaw would not have prevented the spray pond system from performing its safety function and the issue has been entered into the licensees corrective action program as PVAR 4285944. |
| Site: | Palo Verde  |
|---|---|
| Report | IR 05000528/2013002 Section 4OA7 |
| Date counted | Mar 31, 2013 (2013Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | L Ricketson G Guerra M Brown P Elkmann L Carson D Allen J Melfi J Laughlin B Larson M Baquera D Reinert N Greene |
| Violation of: | 10 CFR 50 Appendix B Criterion V |
| INPO aspect | |
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Finding - Palo Verde - IR 05000528/2013002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Palo Verde) @ 2013Q1
Self-Identified List (Palo Verde)
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