ULNRC-06787, Response to Request for Additional Information Regarding License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications (LDCN 21-0015)

Response to Request for Additional Information Regarding License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications (LDCN 21-0015)

ML22342B265
Person / Time
Site:	Callaway
Issue date:	12/08/2022
From:	Witt T Ameren Missouri, Union Electric Co
To:	Office of Nuclear Reactor Regulation, Document Control Desk
Shared Package
ML22342B264	List: ML22342B266 ULNRC-06787, Response to Request for Additional Information Regarding License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications (LDCN 21-0015)
References
ULNRC-06787, LDCN 21-0015
Download: ML22342B265 (1)

Text

Callaway Plant MISSOURI December 8, 2022 ULNRC-06787 U. S Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 10 CFR 50.90 Ladies and Gentlemen:

DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 UNION ELECTRIC CO.

RENEWED FACILITY OPERATING LICENSE NPF-30 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION REGARDING LICENSE AMENDMENT REQUEST FOR ADOPTION OF ALTERNATE SOURCE TERM AND REVISION OF TECHNICAL SPECIFICATIONS (LDCN 21-0015) on September 28, 2021 and per Reference 1 included in the list of references on page 3 of this letter, Ameren Missouri submitted a license amendment request (LAR) for adopting the alternative source term methodology addressed in 1 0 CFR 50.67 and Regulatory Guide 1 1 83 Rev 0, Alternative Radiological Source Terms for Evaluating Design Basis Accidents at Nuclear Power Reactors.

Following several letters related to the NRCs acceptance review ofthe LAR (including LAR supplements submitted by Ameren Missouri), a request for additional information (RAT) was electronically received (via e-mail) from the NRC on October 14, 2022 (Reference 3). The RAT identified discrepancies between the results obtained from the NRC staffs confirmatory runs of its ARCON2 dispersion model and those provided by Ameren Missouri and its contractor (in the Reference 1 LAR and the letter identified as Reference 2 on page 3) using the ARCON96-NAT model.

Those discrepancies have now been addressed.

This letter is submitted to provide corrected results to the NRC staff and respond to the staffs requests for additional information contained in the Reference 3 letter.

In accordance with 1 0 CFR 50.9 1 Notice for public comment; State consultation, Section (b)(l), a copy of this supplement to the Reference 1 LAR is being provided to the designated Missouri State official. This supplement was reviewed by the Callaway Plant Onsite Review Committee.

83 1 5 County Road 459 Steedman, MO 65077 : AmerenMissouri.com

ULNRC-06787 December 8, 2022 Page 2 of 5 This letter does not contain new commitments.

Ifthere are any questions, please contact Mr. Tom Elwood at 314-225-1905.

I declare under penalty ofperjury that the foregoing is true and correct.

Sincerely, Todd A. Witt Manager, Regulatory Affairs Executed on: f - Zt

Enclosure:

Ameren Missouri Response to NRC RATs

ULNRC-06787 December 8, 2022 Page 3 of 5

References:

1 Ameren Missouri letter ULNRC-06636, License Amendment Request for Adoption of Alternate Source Term and Revision ofTechnical Specifications, dated September 28, 2021 (ADAMS Accession No. ML21272A168)

2. Ameren Missouri letter ULNRC-06696, Supplement to License Amendment Request for Adoption of Alternative Source Term and Revision of Technical Specifications, dated December 1, 2021 (ADAMS Accession No. ML21335A452) 3 NRC letter, Final Request for Additional Information Callaway Plant, Unit 1 License Amendment Request for Adoption ofAltemate Source Term and Revision of Technical Specifications EPID L-2021-LLA-0177, transmitted via e-mail on October 14, 2022 (ADAMS Accession No. ML22287A095)

ULNRC-06787 December 8, 2022 Page 4 of 5 cc: Mr. Scott A. Morris 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-06787 December 8, 2022 Page 5 of 5 Index and send hardcopy to QA file A160.0761 Hardcopy:

Certrec Corporation 6500 West Freeway, Suite 400 FortWorth,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 B. L. Cox D. E. Farnsworth B. L. Jungmann T. A. Witt T. B. Elwood B. D. Richardson R. J. Andreasen NSRB Secretary STARS Regulatory Affairs Mr. Jay Silberg (Pillsbury Winthrop Shaw Pittrnan LLP)

Ms. Claire Eubanks (Missouri Public Service Commission)

Mr. Aaron Schmidt (DNR)