ENS 55974
ENS Event | |
|---|---|
04:00 Feb 2, 2022 | |
| Title | Part 21 REPORT- Failure of Flowserve Solenoid Coil |
| Event Description | The following is a synopsis of information received via facsimile:
A Model 38878-8 solenoid valve failed a routine coil resistance test at Catawba Nuclear Station while installed on a feed water isolation valve actuator. The solenoid valve was returned to Flowserve where the low resistance was confirmed. The solenoid coil was then sent to the Original Equipment Manufacturer (OEM) for further evaluation. The OEM (Ohmega) completed their analysis and found the reason for failure to be associated with the magnet wire, but the exact point of failure could not be located due to the construction of the coil. Additionally, Flowserve compiled shipment data for the subject coil and found there to be at least 273 instances where the part was shipped to customers. Of those 273+, this case is the only known instance of a failure associated with the coil. Sites that Flowserve shipped the Model 38878-8 Solenoid Valve to: Comanche Peak, Catawba, Braidwood, Byron, Beaver Valley, Seabrook Due to the rigorous functional testing and the historical reliability of the coil in the field, Flowserve does not believe this incident is indicative of an issue with the manufacturing or testing of the coil and concludes that this issue does not affect other coils currently in service. Ohmega suggests a possible manufacturing improvement of winding the coil with a varnish to provide extra insulation of the magnet wire. Flowserve suggests that plant operators using these solenoid coils measure the resistance of the coil periodically, especially after the coil has been energized for testing or service. |
| 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:+3590.72 h149.613 days <br />21.373 weeks <br />4.919 months <br />) | |
| Opened: | Matt Hobbs 17:43 Jul 1, 2022 |
| NRC Officer: | Dan Livermore |
| Last Updated: | Jul 1, 2022 |
| 55974 - NRC Website
Loading map... {"minzoom":false,"maxzoom":false,"mappingservice":"leaflet","width":"350px","height":"250px","centre":false,"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"zoom":6,"defzoom":14,"layers":["OpenStreetMap"],"image layers":[],"overlays":[],"resizable":false,"fullscreen":false,"scrollwheelzoom":true,"cluster":false,"clustermaxzoom":20,"clusterzoomonclick":true,"clustermaxradius":80,"clusterspiderfy":true,"geojson":"","clicktarget":"","imageLayers":[],"locations":[],"imageoverlays":null} | |
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 | |