GO2-24-124, Docket No. 50-397 Interim Report of the Evaluation of a Deviation Pursuant to 10 CFR 21.21(a)(2)
| ML24326A362 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 11/21/2024 |
| From: | Hauger J Energy Northwest |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| GO2-24-124 | |
| Download: ML24326A362 (1) | |
Text
Jeremy S. Hauger Columbia Generating Station P.O. Box 968, PE30 Richland, WA 99352-0968 509.377.8727 jshauger@energy-northwest.com GO2-24-124 10 CFR 21.21(a)(2)
U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001
Subject:
COLUMBIA GENERATING STATION, DOCKET NO. 50-397 INTERIM REPORT OF THE EVALUATION OF A DEVIATION PURSUANT TO 10 CFR 21.21(a)(2)
Dear Sir or Madam:
Valcor Engineering supplied substitute environmentally qualified O-rings for Type V70900-45 valves. The justification for similarity of the new compound O-ring to the originally qualified O-ring is documented in Delta Qualification Report QRSKC296022-1 which performed aging tests on both the original compound and substitute compound to establish similarity. The review of the Delta Qualification report determined that the report provided thermal aging to achieve a qualified life that was intended to be greater than the original compound O-rings.
The report did not adequately account for temperature rise associated with continuously energized valves and was therefore lacking appropriate thermal aging time to achieve a qualified life that was equal to or greater than the original compound O-ring.
On September 26, 2024, Valcor identified to Columbia Generating Station (CGS) that the new compound O-rings were installed in a supplied valve. At that time, CGS determined that this valve was installed in an EQ application on July 3, 2024.
CGS has determined that additional time beyond the 60-day evaluation period is needed to perform testing which will determine if the new compounds thermal aging characteristics are the same as or better than the original. The testing and subsequent analysis will determine if there is an actual impact to the qualified life of the component based on the change in material.
The completion date has not yet been identified by the vendor.
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November 21, 2024 ENERGY NORTHWEST
GO2-24-124 Page 2 of 2 If you have any questions or require additional information, please contact Mr. Ian Bitner, Regulatory Compliance Supervisor, at (509) 377-4204.
Executed this ______ day of ____________, 2024.
Respectfully, Jeremy S. Hauger Vice President, Engineering cc:
NRC RIV Regional Administrator NRC NRR Project Manager NRC Senior Resident Inspector/988C CD Sonoda - BPA/1399 Matt Hopkins - Winston & Strawn
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DocuSigned by:
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