ML26048A161
| ML26048A161 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 08/15/2024 |
| From: | Morris J Pacific Gas & Electric Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| EN 57271 | |
| Download: ML26048A161 (0) | |
Text
02-12-2026 07:03:41 U.S. Nuclear Regulatory Commission Operations Center Report 14 02-12-2026 07:03:41 U.S. Nuclear Regulatory Commission Operations Center Report Event #:
57271 Event Type:
Part 21 Reporting Org:
Diablo Canyon Notify Date/Time:
2024-08-15 13:25 (EDT)
Licensee:
Diablo Canyon Event Date/Time:
2024-08-13 00:00 (PDT)
Modify Date/Time:
2024-08-15 13:52 Region:
4 City:
Avila Beach Agreement State:
Yes County:
San Luis Obispo License #:
State:
CA Notified by:
Jim Morris Notifications:
Agrawal, Ami R4DO HOO:
Sam Colvard Part 21/50.55 Reactors, - EMAIL Emergency Class:
Non Emergency 10 CFR Sections:
21.21(d)(3)(i)
Defects And Noncompliance PART 21 - COMMERCIALLY SOURCED PART NOT PROPERLY HEAT TREATED 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 Companys (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.
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