ML20155K632
| ML20155K632 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 05/22/1986 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, Rubenstein L Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20155K636 | List: |
| References | |
| 86-279, NUDOCS 8605290083 | |
| Download: ML20155K632 (2) | |
Text
.
VINGINIA ELECTHIC AND POWEH COMi%NY nicuxoxn.Vinoix A 2:1201 W.L.STEWAltf v8CN I'NENIDR1rF NPCLEAM OPENATIONN May 22, 1986 Mr. Harold R. Denton, D(rector Serial No.86-279 Office of Nuclear Reactor Regulation N0/EJL/acm Attn: Mr. Lester S. Rubenstein, Director Docket Nos. 50-339 PWR Project Directorate No. 2 License Nos. NPF-7 Division of PWR Licensing-A U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNIT 2 CORE SURVEILLANCE REPORT FOR CYCLE 5 - REVISION 1 In accordance with North Anna Unit 2 Technical Specification 6.9.1.7 enclosed is Revision 1 of the Core Surveillance Report. for Cycle 5.
As discussed with members of your staff on May 9,1986 we have expanded the report to more explicitly represent the N(Z) function versus core height and burnup. N(Z) is the cycle dependent function that accounts for power distribution transients encountered during normal operation.
The previous Core Surveillance Report for Cycle 5 (which was provided in our letter dated March 4, 1986 - Serial No. 85-655B) contained N(Z) data for three burnup ranges. This Core Surveillance Report provides additional N(Z) data for a total of six burnup ranges. We have determined that this will provide additional margin for the heat flux hot channel factor, FQ, surveillance which utilizes the N(Z) function data in accordance with North Anna Unit 2 Technical Specification 4.2.2.2.
This is particularly true for burnups between the beginning and the middle of cycle life, when N(Z) changes rapidly. The Axial Flux Difference Limits, which are also part of the Core Surveillance Report, were not affected by the revised N(Z) data and remain unchanged. We wonid lika this information to become effective by June 6, 1986.
The information in the report was developed in accordance with our topical report VEP-NE-1, " Relaxed Power Distribution Control Methodology and Associated FQ Surveillance Technical Specifications," for the Cycle 5 core.
ggf188SSISShf
vimointi Es.r.craic awn Powna cowrawr To Fir Harold R. Denton Please contact us if you have any questions or require any additional information.
Very truly yours,
,\\
\\
Wh W. L. Stewart Attachment 1.
North Anna Unit 2, Cycle 5 RPDC Core Surveillance Report for
-FQ=2.20, Revision 1 cc:
Dr. J. Nelson Grace Regional Administrator NRC Region II NRC Senior Resident Inspector North Anna Power Station Mr. Leon B. Engle NRC North 1.nna Project Manager PWR Project Directorate No. 2 Division of PWR I.icensing-A Director, Office of Nuclear Reactor Regulation Attention: Chief, Reactor Systems Branch Division of PWR Licensing-A U.S. Nuclear Regulatory Commission Washington, D.C. 20555
. - - - -