ENS 57402
ENS Event | |
|---|---|
04:00 Aug 20, 2024 | |
| Title | Part 21 Interim Report - Potential Defect with Circuit Board |
| Event Description | The following is a summary of information provided by the licensee via email:
The licensee received two alarms due to direct current (DC) output voltage fluctuating between 127.4 to 131.3 volts. After troubleshooting, the DC output voltage fluctuations were caused by the battery charger printed circuit board. The part has been sent to the vendor, AMETEK, for evaluation. Catawba is the only plant known to have this issue at this time. The evaluation is expected to be completed on January 31, 2025. Catawba condition report number: 02526388 AMETEK Part Number: 80-921-4031-90 AMETEK failure analysis number: 24-006
AMETEK is continuing its evaluation of the circuit boards. The original evaluation completion date was January 31, 2025. AMETEK is extending the evaluation completion date to February 28, 2025. Remaining steps include completing the cause analysis, identifying all affected equipment, finalizing any corrective action measures, and determining actions required. Notified R2DO (Suggs), Part 21 Group (email)
The following is a synopsis of the information provided from AMETEK: AMETEK has submitted their final report for the evaluation of the circuit boards in question. AMETEK identified two failed capacitors on a charger control printed circuit board with part number: 80-9214031-90. The two failed capacitors are C35 (part number: 03-010003-00) and C36 (part number: 03-011006-00). These capacitors have been identified to fail prematurely prior to the 10-year replacement schedule in a few identified cases. AMETEK will be conducting further design evaluations on printed circuit board (PCB) 80-9214031-90 and considering design and/or component changes that will further enhance the reliability of the charger control board. AMETEK reviewed the last 10 years of jobs and identified the following potentially affected U.S. nuclear power plants: Farley Braidwood Byron Dresden Fitzpatrick Ginna Nine Mile Point Quad Cities Millstone North Anna Surry Catawba Robinson Harris McGuire Oconee Beaver Valley Davis Besse 3 Columbia Generating Station Arkansas Nuclear One Grand Gulf River Bend Waterford Hatch Vogtle Unit 1 and Unit 2 DC Cook Seabrook Turkey Point Point Beach Diablo Canyon Sequoyah Watts Bar Comanche Peak Prairie Island Palisades (ISFSI) Three Mile Island (ISFSI) Notified R1DO (Defrancisco), R2DO (Penmetsa), R3DO (Feliz-Adorno), R4DO (Roldan-Otero), Part 21 Group (email)
AMETEK provided an update to their final report to include additional variations of the charger control board. There is no change to the affected users, findings, or resolution. Notified R1DO (Schussler), R2DO (Pearson), R3DO (Edwards), R4DO (Warnick), Part 21 Group (email) |
| Where | |
|---|---|
| Duke Energy Nuclear Llc York, South Carolina (NRC Region 2) | |
| Organization: | Catawba |
| Reporting | |
| 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component | |
| Time - Person (Reporting Time:+1665.92 h69.413 days <br />9.916 weeks <br />2.282 months <br />) | |
| Opened: | Ari Tuckman 13:55 Oct 28, 2024 |
| NRC Officer: | Natalie Starfish |
| Last Updated: | Mar 13, 2025 |
| 57402 - 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} | |
Duke Energy with 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component | |
WEEKMONTHYEARENS 574022024-08-20T04:00:00020 August 2024 04:00:00
[Table view]10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component Part 21 Interim Report - Potential Defect with Circuit Board 2024-08-20T04:00:00 | |