ML24039A160

Unit L & 2, Supplement to Modify the Implementation Date for License Amendment Request to Revise Alternate Source Term Dose Calculation

ML24039A160
Person / Time
Site:	South Texas
Issue date:	02/08/2024
From:	Harshaw K South Texas
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
NOC-AE-24004008, 5552059, EPID L-2023-LLA-0047
Download: ML24039A160 (1)

Text

t'l Campany U:T Sulhf<:rrs{'ft}ff,iI'!.T]t'r'{;ottritlitt.ilnlhft lldl&r.r.l.f9 tlldsvvtft.7*ras.:!:?}$.1 February 8,2024 NOC-AE-24004008 10 cFR 50.90 STI: 35552059 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 South Texas Project Unitl&2 Docket Nos. STN 50-498 and STN 50-499 Supplement to Modify the lmplementation Date for License Amendment Request to Revise Alternate Source Term Dose Calculation (EPID: L-2023-LLA-0047)

Reference

1. Letter from K. Harshaw to Document Control Desk, "South Texas Project Units 1 & 2 Docket Nos. STN 50-498, STN 50-499 License Amendment Request to Revise Alternative Source Term Dose Calculation," dated March 30,2023 (NOC-AE-23003941 ) (M1230894204)

2. Letter from K. Harshaw to Document Control Desk, "South Texas Project Units 1 & 2 Docket Nos. STN 50-498 and STN 50-499 Response to Request for Additional lnformation for License Amendment Request to Revise Alternate Source Term Dose Calculation (EPID: L-2023-LLA-0047)," dated October 19, 2023 (NOC-AE-23003990)

(ML232924311)

On March 30,2023, STP Nuclear Operating Company (STPNOC) submitted the referenced license amendment request (LAR). ln that LAR, STPNOC requested approval of the proposed change by April 4,2024, and stated that implementation of the amendment would occur within 90 days of the NRC approval date. lmplementation of the LAR will require modifications to the default release durations for the Main Steam Line Break and Locked Rotor events modeled in STPNOC's offsite dose projection model (STAMPEDE). STPNOC has a scheduled Emergency Preparedness NRC Graded Exercise scheduled for July 17,2024. The exercise scenario has been written using the current dose assessment program and procedures, has been validated on the operations simulator, and is in the approval process. Making changes to STAMPEDE prior to the exercise would be problematic in executing the exercise. Therefore, STPNOC requests a change to the implementation date for the referenced LAR. STPNOC will now implement the amendment within 90 days of the approval date or October 1,2024, whichever is later.

There are no commitments in this letter.

lf there are any questions or if additional information is needed, please contact Tim Hammons at (361) 972-7347 or me at (361) 972-4778.

I declare under peryury that the foregoing is true and correct.

Kimberly A. Harshaw Executive VP and CNO Executed on l

NOC-AE-24004008 Page 2 of 2 cc:

Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 1600 E. Lamar Boulevard Arlington, TX 76011-4511 Dennis Galvin Project Manager U.S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Division of Operating Reactor Licensing Licensing Project Branch 4 John Vera Senior Resident Inspector, South Texas Project U.S. Nuclear Regulatory Commission Leanne Flores Resident Inspector, South Texas Project U.S. Nuclear Regulatory Commission Robert Free, Texas Department of State Health Services