ML18153C861

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Forwards VEP-NAF-2, Reactor Power Distribution Analysis Using Moveable In-Core Detection Sys & Tip/Cecor Computer Code Package.
ML18153C861
Person / Time
Site: Surry, North Anna  Dominion icon.png
Issue date: 12/20/1991
From: Stewart W
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML18151A895 List:
References
91-746, NUDOCS 9201060268
Download: ML18153C861 (2)


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VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 December 20, l99l U.S. Nuclear Regulatory Commission Serial No.91-746 Attention: Document Control Desk NL&P/JYR Washington, D.C. 20555 Docket Nos. 50-280 50-281 50-338 50-339 License Nos. DPR-32 DPR-37 NPF-4 NPF-7 Gentlemen:

VIRGINIA ELECTRIC AND POWER COMPANY SURRY POWER STATION UNITS 1 AND 2 NORTH ANNA POWER STATION UNITS 1 AND 2 TIP/CECOR TOPICAL REPORT VEP-NAF-2 Enclosed for your review and approval is the Virginia Electric and Power Company's Topical Report VEP-NAF-2, "Reactor Power Distribution Analysis Using A Moveable In-Core Detector System and The TIP/CECOR Computer Code Package," November, 1991.

The attached report describes Virginia Electric and Power Company's TIP/CECOR computer code package as an alternative methodology to synthesize three-dimensional core power distributions. We currently use the INCORE code to perform this function .. However, INCORE does not have the ability to model the number of core axial regions that are required by the use of part-length flux suppression inserts. These inserts are planned for use in Surry Unit 1, Cycle 13 which is currently scheduled for Spring 1994. It is our intention to use TIP/CECOR for core power distribution monitoring and surveillance, core follow and methods development verification for both Surry and North Anna Power Stations.

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e The attached report has been reviewed by the Station Nuclear Safety and*

Operating Committee at each station. If you have any questions on the material in the report, please contact us.

Very truly yqurs,

'\\ (CL_\

W.l-~*

W. L. Stewart Senior Vice President - Nuclear Enclosure cc: U.S. Nuclear Regulatory Commission 101 Marietta Street, N.W.

Suite 2900 Atlanta, GA. 30323 Mr. M. S. Lesser NRC Senior Resident Inspector North Anna Power Station Mr. M. W. Branch N RC Senior Resident Inspector Surry Power Station