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| Start date | Reporting criterion | Title | Event description | System | LER | |
|---|---|---|---|---|---|---|
| ENS 50888 | 13 March 2015 04:00:00 | 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | Improper Weld Used on Gate Valve Cover | The following was received from the licensee via email: This notification is being submitted pursuant to the guidelines of 10 CFR Part 21 to report that, during the manufacturing of a replacement cover for a 24 inch gate valve on the reactor recirc line at Exelon LaSalle, Weir Valves and Controls used a weld that was not compliant to ASME Ill Subsection NB requirements. During review of the weld at site, the question was raised based on site procedures required a 2:1 profile in accordance to EPRI guidelines. During review of the documentation to determine if the 2:1 profile was required in this case, Weir Valves and Controls determined that improper weld call out was used on the design prints. The weld was corrected at site to meet the both ASME Ill Subsection NB requirements and EPRI guidelines. Weir Valves and Controls has performed an extent condition review and has concluded that no other undersized welds were made and delivered to any other operating sites. The root-cause of the issue was the improper call-out of the weld by design engineering. Weir Valves and Controls is performing corrective actions to ensure future re-occurrences cannot occur in design engineering. |