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| Start date | Reporting criterion | Title | Event description | System | LER | |
|---|---|---|---|---|---|---|
| ENS 56907 | 23 October 2023 06:00:00 | 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | Part 21 Report - Defect in Valcor Solenoid Valves | The following is a synopsis of information received via facsimile: Valcor Engineering Corporation (VEC) identified a defect with Valcor solenoid valves with part number V52600-5890-1 on October 23, 2023. The defect identified is that stroke matching of internal components was not performed in accordance with internal procedures causing valve flow coefficient (Cv) to be only approximately 50 percent of the minimum required Cv of 2. Substantial safety hazard could be created if the flow rate through the solenoid valve exceeded a certain threshold. VEC has identified two of these solenoid valves at LaSalle County Nuclear Generating Station (LaSalle) with serial numbers 33 and 34. For corrective actions, VEC repaired and returned the valve with serial number 34 to LaSalle. To prevent recurrence, VEC intends to improve the training program for production personnel and, if needed, review and revise the stroke matching procedure including enhancing quality assurance oversight of that process. VEC estimates it will take 30 days to complete corrective actions. Currently, LaSalle is the only known affected facility. Valcor is in the process of identifying and notifying affected customers. For additional information, please contact Mike Swirad, Valcor Engineering Quality Assurance Director (973-467-8400 x 7223), email: mikeswirad@valcor.com | ||
| ENS 55999 | 19 May 2022 04:00:00 | 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component | Part 21 Report - Potential Premature Failures of Valcor Coil Shell Assemblies | The following is a synopsis of information received via facsimile: Valcor Engineering Corporation (VEC) was notified via a letter dated 5/19/2022 that Catawba Nuclear Station (CNS) discovered two failed Coil Shell Assemblies, part number V52653-6040-7, which were removed from V70900-39-3-1 Solenoid Valves and returned to VEC for evaluation. VEC has not concluded this is a reportable condition in accordance with 10 CFR 21.22(d) and requires additional time to complete testing and evaluation. VEC is submitting this 60-day Interim Report Notification per 10 CFR 21.21(a)(2). VEC will complete the evaluation and provide a determination of reportability in accordance with Part 21 no later than 09/12/2022. Currently, Catawba Nuclear Station is the only affected facility. For additional information, please contact Mike Swirad, Valcor Engineering Quality Assurance Director (973-467-8400 x 7223)
The following is a synopsis of information received via facsimile: VEC is providing final notification with regard to defects in coil shell assemblies (part number V52653-6040-7) per 10CFR Part 21.21(d)(4). The root cause of failure of this part was determined to be an internal short in the coil shell assembly. In addition to Catawba, licensees affected are: Brunswick, Callaway Energy Center, Oconee, Braidwood, and Fitzpatrick. Root cause of the failed component is inconsistency in the coil assembly manufacturing process. VEC initiated internal and supplier corrective actions and all coil shell assemblies have been quarantined and VEC supplier was notified. All existing coil assemblies in stock will be reworked to conform to VEC drawings. Completion of rework expected within 60 days. VEC is in the process of notifying all affected customers. Defect can not be visually or electrically identified. All coil assemblies that perform safety related function must be returned to VEC for evaluation/replacement. For additional information, please contact Mike Swirad, Valcor Engineering Quality Assurance Director (973-467-8400 x 7223) Notified R1DO (Young), R2DO (Miller), R3DO (Hanna), R4DO (Drake) and via email: Part 21 Reactors. | ||
| ENS 52407 | 5 December 2016 05:00:00 | 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | Part 21 - Non-Conforming Cover Machining on Solenoid Valve | The following is a synopsis of the Part 21 report that was received via fax: Cover Machining is installed on upper section of Solenoid Valve and it allows for the electrical connection to the valve solenoid and protects inside wiring of the solenoid from environmental condition. Cover machining part number V52636-567 has 0.190 radius (Drawing V52620-50 Zone D3) which was machined too deep removing material from surface needed for proper O-ring seal. The lack of material exposes part of the sealing O-ring which could diminish the O-ring sealing capability. With O-ring sealing capability diminished, Valcor cannot ensure that valves with Cover Machining Installed on Solenoid Assembly will perform its safety function during all postulated events. This item has historically been manufactured by machining a casting. For the lot involved, castings were not available. Authorization was given to manufacture the Cover directly from suitable bar stock. To accomplish this, Valcor's vendor used the casting drawing and casting machining drawing to manufacture the finished machined part. The combination of these two drawings had insufficient control on the corner radius, resulting in this nonconformance. All defective covers in stock have been quarantined and a nonconformance report has been generated. Lack of location controlling dimension on the Cover Machining drawing for 0.190 radius was discovered to be the root cause of the defect. Valcor has created and released a new engineering drawing that properly controls the location of 0.190 radius. This action has been completed as of 11/22/2016. Engineering Manager-Nuclear was responsible to this action. Valcor is in a process of notifying all affected customers. Customers: Ameren, Valve Part Number V526-6000-16 (Stock# 7731643), S/N 9, QTY 1, Location Ameren Missouri - Callaway Bruce Power (BPC), Valve Part Number V526-6000-20 (Cat ID 142129), S/N 28-36, QTY 9, Bruce NGS Note: All 9 valves supplied to BPC have been returned to Valcor for nameplate correction and are accounted for. If you have any questions or addition information is needed regarding this matter, please contact Fran Lucano at 973-467-8400. |