ENS 56764
ENS Event | |
|---|---|
04:00 Sep 29, 2023 | |
| Title | Part 21 Interim Report - Deviation Associated with an SMB-1 Geared Limit Switch Assembly |
| Event Description | The following information was provided by Flowserve via phone and email:
The purpose of this letter is to provide written notification of an evaluation of a deviation in a basic component in accordance with 10 CFR21.21(a)(2). This interim report pertains to actuator geared limit switch assemblies contained in SMB-1 actuators supplied to Bopp & Reuther Valves for use in safety related applications at Bruce Nuclear Generating Station. Flowserve - Limitorque was contacted by Bruce Power who reported a malfunction of an actuator geared limit switch (GLS) assembly which occurred while attempting to set the valve travel position limits prior to placing the actuator into service. Site inspections of the GLS assembly revealed damage to the GLS drive pinion which engages with the actuator drive train. Site photos and dimensional measurements of the drive pinion requested by Flowserve indicate that the GLS was assembled with an incorrect drive pinion resulting in the malfunction. Use of an incorrect subcomponent in the assembly constitutes the deviation to the design being evaluated. The actuator GLS assembly is a safety related component. A malfunction of the GLS in service has the potential to affect the safety function of the actuator. The assembly containing the deviation is a 4-train geared limit switch (GLS) assembly part number 10168 supplied in SMB-1 actuators manufactured on Flowserve order 175377.001 Three actuators (serial numbers L1226986, L1226987, & L1226988) were shipped to Bopp & Reuther Valves on 2/4/2020. Flowserve's evaluation of this issue is ongoing and will not be completed within 60 days. The evaluation is expected to be completed by 11/17/2023 pending return of the affected components to Flowserve for inspection. Questions concerning this notification can be directed to Chris Shaffer, Quality Manager." The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance: This issue was identified at a Canadian reactor plant owned by Bruce Power. The Quality Manager at Flowserve is not currently aware of any affected US reactor plants.
Flowserve Quality Assurance Manager submitted the Final Part 21 Report pertaining to a deviation in a basic component in accordance with 10 CFR 21.21(a)(2). The report concluded that the evaluated deviation constitutes a reportable defect affecting three actuators listed in the final report. Notified R1DO (Defrancisco), R2DO (Miller), R3DO (Feliz-Adorno), R4DO (Vossmar), and Part 21 Reactors (email). |
| Where | |
|---|---|
| Flowserve Lynchburg, Virginia (NRC Region 1) | |
| Organization: | Flowserve |
| Reporting | |
| 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component | |
| Time - Person (Reporting Time:+4.6 h0.192 days <br />0.0274 weeks <br />0.0063 months <br />) | |
| Opened: | Christopher Shaffer 08:36 Sep 29, 2023 |
| NRC Officer: | Lawrence Criscione |
| Last Updated: | Nov 17, 2023 |
| 56764 - NRC Website
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Flowserve with 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component | |
WEEKMONTHYEARENS 567642023-09-29T04:00:00029 September 2023 04:00:00
[Table view]10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component Part 21 Interim Report - Deviation Associated with an SMB-1 Geared Limit Switch Assembly ENS 562522022-10-05T05:00:0005 October 2022 05:00:00 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component Part 21 - Deviation to Qualified Design ENS 550952020-12-09T05:00:0009 December 2020 05:00:00 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component Part 21 Report - Actuator Failure Due to Loose Cam Pins ENS 545842020-03-12T04:00:00012 March 2020 04:00:00 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component ENS 506102014-11-13T05:00:00013 November 2014 05:00:00 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component Part 21 - Miller Air Cylinder Seals Dedication Issue 2023-09-29T04:00:00 | |