05000373/FIN-2015001-02
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Finding | |
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| Title | Failure to Measure Interpass Temperature |
| Description | The inspectors identified a Green NCV of Title 10, CFR Part 50, Appendix B, Criterion IX, Control of Special Processes, for a failure of the licensee on February 12, 2015, to measure the interpass temperature while performing welding on the 2 diesel generator cooling water (DGCW) piping system. Consequently, welding was performed without the Code-and procedure-required interpass temperature being monitored on a number of welds, a parameter, which could have affected the mechanical properties of the material being welded. To restore compliance, the welders proceeded to measure the interpass temperatures on the balance of the welds, and verified that the interpass temperature did not exceed that allowed by procedure. The licensee entered this issue into its CAP as AR 02451583. The inspectors determined that this issue was a performance deficiency that was more than minor because it had the potential to lead to a more significant safety concern. Specifically, absent NRC inspector intervention, the welders would have completed all of the welds without having measured the interpass temperature, a welding parameter which can affect the mechanical properties (e.g., impact properties) of some materials being welded, and, if left uncorrected could lead to a potential failure of the weld in service. The inspectors determined this finding was of very low safety significance (Green) because the DGCW system maintained its operability or functionality. The welders proceeded to measure the interpass temperatures on the balance of the welds, and verified that the interpass temperature did not exceed that allowed by procedure, and the issue did not result in the actual loss of the operability or functionality of a safety system. The inspectors determined that the primary cause of the failure to measure the interpass temperature while performing a manual welding process was related to the cross-cutting area of Human Performance, Procedure Adherence aspect (H.8). Specifically, the welders failed to follow procedures. |
| Site: | LaSalle  |
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| Report | IR 05000373/2015001 Section 1R08 |
| Date counted | Mar 31, 2015 (2015Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.08 |
| Inspectors (proximate) | A Mcmurtray G Hansen J Cassidy J Robbins M Kunowski N Valos R Ruiz R Zuffa T Bilik D Krause |
| Violation of: | 10 CFR 50 Appendix B Criterion IX |
| CCA | H.8, Procedure Adherence |
| INPO aspect | WP.4 |
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Finding - LaSalle - IR 05000373/2015001 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (LaSalle) @ 2015Q1
Self-Identified List (LaSalle)
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