05000255/FIN-2013003-01
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Finding | |
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| Title | Inadequate Control of Welding at the F-East Nozzle Reinforcement Plate |
| Description | The inspectors identified a finding of very low safety significance and an associated non-citied violation of 10 CFR 50, Appendix B, Criterion IX, Control of Special Processes, for the licensees failure to perform adequate pre-weld cleaning and control the welding process in a manner that ensured proper weld fusion of the F-East nozzle reinforcement plate weld joint within the safety injection refueling water storage tank (SIRWT). Consequently, this weld failed in service causing leakage from the SIRWT. The licensee subsequently replaced the floor of the SIRWT and included instructions in the floor replacement work order that required pre-weld cleaning with acetone or other approved solvents. The licensee entered the issue in their corrective action program (CAP) as CR- PLP-2013-03185. The finding was determined to be more than minor in accordance with IMC 0612, Appendix B, Issue Screening, because the inspectors answered yes to the More-than-Minor screening question, If left uncorrected, would the performance deficiency have the potential to lead to a more significant safety concern ? Absent NRC identification, the failure to adequately clean aluminum prior to welding and adequately control the repair welding techniques may have been repeated during future repairs to the SIRWT and resulted in lack of fusion type weld defects/cracks returned to service. Unstable cracks could propagate and create failure of the SIRWT pressure boundary resulting in loss of inventory and increase the risk for insufficient core cooling for post Loss-of-Coolant Accident (LOCA) conditions. Therefore, this finding adversely affected the mitigating systems cornerstone attribute of equipment performance (reliability). The inspectors determined this finding was of very low safety significance (Green) based on answering no to the questions in Part A of Exhibit 2, Mitigating Systems Screening Questions, in IMC 0609, Appendix A, The Significance Determination Process (SDP) for Findings At-Power. Specifically, the small amount of leakage from the SIRWT weld leak did not result in loss of a mitigating system function. Therefore, this finding screened as having very low safety significance (Green). This finding has a cross-cutting aspect in the area of human performance for the resources component because the licensee did not ensure that personnel, equipment, procedures, and other resources were available and adequate to assure nuclear safety was supported. |
| Site: | Palisades  |
|---|---|
| Report | IR 05000255/2013003 Section 1R08 |
| Date counted | Jun 30, 2013 (2013Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.08 |
| Inspectors (proximate) | M Holmberg C Zoia J Lennartz T Taylor J Gilliam A Scarbeary R Edwards |
| Violation of: | 10 CFR 50 Appendix B Criterion IX |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Palisades - IR 05000255/2013003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Palisades) @ 2013Q2
Self-Identified List (Palisades)
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