ENS Event | |
|---|---|
07:00 Aug 13, 2024 | |
| Title | Part 21 - Commercially Sourced Part Not Properly Heat Treated |
| Event Description | The following information was provided by the licensee via phone and email:
On August 13, 2024, Diablo Canyon Power Plant (DCPP) determined that a manufacturing non-conformance associated with snubber valve assemblies identified with ALCO part number 2402466 is reportable under 10 CFR Part 21. Pacific Gas and Electric Company's (PGE) evaluation has determined the upper body of these valves did not meet material and heat treatment requirements (AISI 1117 resulfurized carbon steel vs. AISI 8620/8630 low alloy steel). Similar Part 21 reports regarding issues associated with the material and heat treatment requirements of ALCO snubber valves have been previously reported by others. The subject parts were procured as commercial grade items and dedicated by PGE solely for use at DCPP. Therefore, although previously reported, and potentially not required per the provisions of Part 21.21 (d)(2), DCPP is conservatively making this notification. There is no impact to the operability of any safety related systems or impact to the health and safety of the public. All spare valve assemblies have been removed from PGE's warehouse. The NRC senior resident inspector has been notified, and a written report will be submitted within 30 days. The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance: No other nuclear power plants were affected. |
| Where | |
|---|---|
Diablo Canyon  Avila Beach, California (NRC Region 4) | |
| Organization: | Diablo Canyon |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+54.42 h2.268 days <br />0.324 weeks <br />0.0745 months <br />) | |
| Opened: | Jim Morris 13:25 Aug 15, 2024 |
| NRC Officer: | Sam Colvard |
| Last Updated: | Aug 15, 2024 |
| 57271 - NRC Website
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WEEKMONTHYEARENS 572712024-08-13T07:00:00013 August 2024 07:00:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Commercially Sourced Part Not Properly Heat Treated ENS 547212020-05-18T18:57:00018 May 2020 18:57:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Inadequate Dedication of Replacement Thermocouples ENS 478722012-04-29T07:00:00029 April 2012 07:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Controllers Did Not Meet Emi / Rfi Guidelines 2024-08-13T07:00:00 | |