ENS 56219
ENS Event | |
|---|---|
04:00 Sep 11, 2022 | |
| Title | Part 21 - Flowserve Solenoid Valve Deficiency Report |
| Event Description | The following is a synopsis of information provided by Flowserve via fax:
Flowserve Corporation hereby submits the enclosed written notification of the identification of a defect, in accordance with the requirements of 10 CFR 21.21(d)(3)(ii). This notification pertains to the failure of a solenoid valve (model 38878-8) at Catawba Nuclear Station. List of plants / customers potentially impacted: Duke - Catawba Luminant - Comanche Peak Exelon - Byron Exelon - Braidwood NextEra Energy - Seabrook The solenoid valve received by Duke Energy failed to shift position when the coil was initially energized. This solenoid valve is part of the feedwater isolation valve assembly and failure to shift will prevent the feedwater isolation valve from closing on demand. Flowserve was initially notified on September 11, 2022. Flowserve provided response to Duke on September 15, 2022 to confirm that Flowserve would perform the evaluation within 45 days upon receipt of the solenoid valve. Flowserve received the solenoid valve for evaluation on October 5, 2022. During Flowserve's investigation into the root cause of the solenoid valve failure, Flowserve was unable to replicate the failure. Based on examination of the solenoid valve components, excess thread lock compound had been applied to the set screw and nut on the coil cap. The excess thread lock compound then ran down the coil cap and wicked between the coil cap outside diameter and the end cap inside diameter. Once this excess thread lock compound cured, the coil cap was locked in the de-energized position, preventing the coil cap from shifting. After the customer left the solenoid valve energized for 10 minutes, the coil cap broke free from de-energized position and was able to shift freely. In the procedure for assembly and testing of this solenoid valve, the solenoid valve is not energized after application of the thread lock compound. Flowserve will (1) revise the assembly and test procedure for the Model 38878 solenoid valve to add a final test after the thread lock component has been applied and been allowed to cure to verify the solenoid valve shifts when energized, and (2) provide training to assembly and test personnel on the importance of ensuring that excess thread lock compound has not been applied. These actions will be completed by December 15, 2022. Nuclear power plants with model 38878 solenoid valves that have not undergone acceptance testing should verify that these suspect solenoid valves will shift on demand when energized. For additional information, please contact Kayn Dills, Flowserve Corp Quality Manager (800-225-6989) |
| Where | |
|---|---|
| Flowserve Raleigh, North Carolina (NRC Region 1) | |
| Organization: | Flowserve |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+1473 h61.375 days <br />8.768 weeks <br />2.018 months <br />) | |
| Opened: | Kayn Dills 14:00 Nov 11, 2022 |
| NRC Officer: | Ian Howard |
| Last Updated: | Nov 11, 2022 |
| 56219 - NRC Website | |
Flowserve with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 571672024-06-07T04:00:0007 June 2024 04:00:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Check Valve Fails Bench Test ENS 562192022-09-11T04:00:00011 September 2022 04:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Flowserve Solenoid Valve Deficiency Report ENS 559742022-02-02T04:00:0002 February 2022 04:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 REPORT- Failure of Flowserve Solenoid Coil ENS 555052021-08-04T04:00:0004 August 2021 04:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Actuator Failure ENS 538912019-02-20T05:00:00020 February 2019 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Flowserve Valve Assist Springs May Prevent Full Closure ENS 522122016-08-31T04:00:00031 August 2016 04:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Notification - Flowserve Swing Check Valves ENS 481572012-08-03T04:00:0003 August 2012 04:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Defective Valve Seal Cap ENS 480042012-05-25T04:00:00025 May 2012 04:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Published Flow Coefficients for Pilot Operated Relief Valves Greater than Actual 2024-06-07T04:00:00 | |