ULNRC-06949, Revision (Supplement) to Request to ASME Code Relief Regarding 48-Hr Hold Time When Performing Repairs Using Ambient Temperature GTAW Temper Bead Method Per ASME Code Case N-638-11 (Relief Request 15R-01)
| ML25148A290 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 05/28/2025 |
| From: | Elwood T Ameren Missouri, Union Electric Co |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| Shared Package | |
| ML25148A289 | List: |
| References | |
| ULNRC-06949 | |
| Download: ML25148A290 (1) | |
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.t Callaway Plant 8315 County Road 459 : Steedman, MO 65077 : AmerenMissouri.com
.t May 28, 2025 ULNRC-06949 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 10 CFR 50.55a Ladies and Gentlemen:
DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 UNION ELECTRIC CO.
RENEWED FACILITY OPERATING LICENSE NPF-30 REVISION (SUPPLEMENT) TO REQUEST FOR ASME CODE RELIEF REGARDING 48-HOUR HOLD TIME WHEN PERFORMING REPAIRS USING AMBIENT TEMPERATURE GTAW TEMPER BEAD METHOD PER ASME CODE CASE N-638-11 (RELIEF REQUEST I5R-01)
References:
- 1. Ameren Missouri letter ULNRC-06947, "Request for ASME Code Relief Regarding 48-Hour Hold Time When Performing Repairs Using Ambient Temperature GTAW Temper Bead Method Per ASME Code Case N-638-11 (Relief Request I5R-01)," dated May 22, 2025 (ADAMS Accession No. ML25142A386)
- 2. Enclosure 1 to Ameren Missouri letter ULNRC-06947, "Relief Request I5R-01," dated May 22, 2025 (ADAMS Accession No. ML25142A387)
- 3. NRR e-mail, "
Subject:
Callaway Plant, Unit 1 - Verbal Authorization of Request for Alternative I5R 48-Hour Non-Destructive Examination Hold - EPID: L-2025-LLR-0054," dated May 23, 2025 (ADAMS Accession No. ML25147A126)
On May 22, 2025, Ameren Missouri submitted a letter (Reference 1) proposing a request for an alternative, i.e., Relief Request I5R-01 (Reference 2), related to the implementation of a half-nozzle repair modification of three reactor vessel bottom-mounted instrument (BMI) nozzle penetrations (Nos. 48, 35, and 30). As described in the Reference 1 letter and Relief Request I5R-01, the modification of three BMI nozzle penetrations was deemed necessary following under-vessel visual and non-destructive examinations (NDE), from which indications in the J-groove welds were identified. To support the start of repair modification work, which was projected to begin on May 25 or 26, Relief Request I5R-01 was submitted prior to completing the NDE analysis of all 58 BMI nozzles. Ameren respectfully requested verbal approval of Relief Request I5R-01 on or before
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WAmeren MISSOURI
ULNRC-06949 May 28, 2025 Page 2 of 4 Saturday, May 24. On May 23, 2025, via Reference 3, the NRC verbally approved Relief Request I5R-01 for the three BMI nozzle penetration half-nozzle repair modifications.
On May 23, 2025, NDE analysis of all 58 BMI nozzles was completed. From this analysis, it was determined that one additional BMI nozzle penetration (No. 57) requires the same half-nozzle repair modification. Therefore, the enclosure to this letter serves to provide a revision to the original Relief Request I5R-0l. Updates include adding the fourth BMI nozzle penetration and removing language that the NDE analysis is preliminary. There are no other changes to the original relief request or its technical justification. Further, as stated in the original and revised Relief Request l5R-01, Ameren will be proposing an additional alternative (i.e., one-cycle justification), in a separate relief request, related to ASME Section XI Code requirements on flaw indications identified in the J-groove welds.
Verbal approval of that request will be sought prior to heat-up and pressurization of the reactor in preparation for restart from the current outage.
It should be noted that Callaway's Inservice Inspection (ISI) Program complies with the 2019 Edition of the ASME Boiler and Pressure Vessel Code (BPVC),Section XI. Callaway's fifth ISI interval began December 19, 2024, and ends on December 18, 2036, as a result of Callaway moving from the ten-year to the twelve-year ISI interval as allowed by ASME Code Case N-921.
In regard to Ameren Missouri's request for approval of the revised Relief Request I5R-01, verbal approval is desired ahead of the modification repair of the fourth BMI nozzle penetration. As this repair is projected to begin on June 6 (2025), verbal approval is respectfully requested on or before Tuesday, June 4 (2025).
For any questions concerning this submittal, please contact the undersigned at (314) 225-1905.
This letter does not contain new commitments.
ESS, "Relief Request I5R-01" to Enclosure 1 Sincerely, Thomas B. Elwood Regulatory Affairs Manager
ULNRC-06949 May 28, 2025 Page 3 of 4 cc:
Mr. John Monninger Regional Administrator U. S. Nuclear Regulatory Commission Region IV 1600 East Lamar Boulevard Arlington, TX 76011-4511 Senior Resident Inspector Callaway Resident Office U.S. Nuclear Regulatory Commission 8201 NRC Road Steedman, MO 65077 Mr. M. Chawla Project Manager, Callaway Plant Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop O8B1A Washington, DC 20555-0001
ULNRC-06949 May 28, 2025 Page 4 of 4 Index and send hardcopy to QA File A160.0761 Hardcopy:
Certrec Corporation 6500 West Freeway, Suite 400 Fort Worth, TX 76116 (Certrec receives ALL attachments as long as they are non-safeguards and may be publicly disclosed.)
Electronic distribution for the following can be made via Responses and Reports ULNRC Distribution:
F. M. Diya K. C. Scott T. M. Hart J. G. Beck T. A. Witt T. B. Elwood NSRB Secretary STARS Regulatory Affairs Mr. Jay Silberg (Pillsbury Winthrop Shaw Pittman LLP)