BVY 04-083, Vermont Yankee Nuclear Power Station - RELAP5/MOD3 Computer Code

Vermont Yankee Nuclear Power Station - RELAP5/MOD3 Computer Code

ML042320605
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	08/12/2004
From:	Devincentis J Entergy Nuclear Northeast
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
BVY 04-083
Download: ML042320605 (3)

Text

Entergy Nuclear Northeast Entergy Nuclear Operations, Inc.

Vermont Yankee 185 Old Ferry Rd.

%-vEterg y P.O. Box 500 En gBrattleboro, VT 05302 Tel 802-257-5271 August 12, 2004 Docket No. 50-271 BVY 04-083 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

Subject:

Vermont Yankee Nuclear Power Station RELAP5lMOD3 Computer Code

Reference:

1) Entergy letter to U.S. Nuclear Regulatory Commission, "Vermont Yankee Nuclear Power Station, Technical Specification Proposed Change No. 263, Extended Power Uprate," (BVY 03-80) September 10, 2003 Through discussions with the NRC staff, Entergy understands that the NRC staff is conducting sensitivity analyses to independently confirm certain calculations and evalutions that support the extended power uprate (EPU) license amendment application for the Vermont Yankee Nuclear Power Station (VYNPS) that was submitted on September 10, 2003 (Reference 1). In this regard, the NRC staff has requested that Entergy provide a copy of the computer code RELAP5/MOD3 basedeck. Although VNPS-specific data for EPU have been added, the RELAP5/MOD3 basedeck is historical and has not been used to support the VYNPS licensing basis, including the application for EPU. Consequently, Entergy has not confirmed the accuracy or applicability of the information contained in the basedeck in accordance with Entergy's quality assurance program. Attachment 1 is a copy of the basedeck on a CD-ROM disk.

The computer codes in the RELAP5 series were developed through Idaho National Engineering Laboratory and are general purpose, thermal hydraulic system codes used primarily to simulate the response of the nuclear steam supply system to a wide variety of postulated transients and accidents.

There are no new regulatory commitments contained in this submittal.

If you have any questions or require additional information, please contact Mr. James DeVincentis at (802) 258-4236.

Sincerely, g/ames D ince ts Manager, Licensing Vermont Yankee Nuclear Power Station Attachment (1)

BVY 04-083 Docket No. 50-271 Page 2 of 2 cc: Mr. Richard B. Ennis, Project Manager (w/attachment)

Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation Mail Stop 0 8 BI Washington, DC 20555 Mr. Samuel J. Collins (w/o attachment)

Regional Administrator, Region 1 U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406-1415 USNRC Resident Inspector (w/o attachment)

Entergy Nuclear Vermont Yankee, LLC P.O. Box 157 Vernon, Vermont 05354 Mr. David O'Brien, Commissioner (w/o attachment)

VT Department of Public Service 112 State Street - Drawer 20 Montpelier, Vermont 05620-2601

BVY 04-083 Docket No. 50-271 Attachment I Vermont Yankee Nuclear Power Station RELAP5/MOD3 Computer Code Total number of pages In Attachment I (excluding this cover sheet) Is 0. The Attachment Is a CD-ROM disk.