ML20082F456

Application for Amend to Licenses NPF-4 & NPF-7,revising Tech Spec Limits for Quadrant Power Tilt Ratio to Allow full-core Flux Mapping

ML20082F456
Person / Time
Site:	North Anna
Issue date:	11/18/1983
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	Harold Denton, John Miller Office of Nuclear Reactor Regulation
Shared Package
ML20082F459	List: ML20082F456 ML20082F461
References
555, NUDOCS 8311290046
Download: ML20082F456 (4)

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VINGINIA ELECTRIC AND POWER CO)1PANY RicnMoxo,VruoINIA 20261 W.L. STEWART Vaca Pum.innut xects.. o,..mos. November 18, 1983 Mr. Harold R. Denton, Director Serial No: 555 Office of Nuclear Reactor Regulation N0/ CTS:ceh Attn: Mr. James R. Miller, Chief Docket Nos.: 50-338 Operating Reactors Branch No. 3 50-339 Division of Licensing U. S. Nuclear Regulatory Commission License Nos.: NPF-4 Washington, D. C. 20555 NPF-7 Gentlemen:

AMENDMENT TO OPERATING LICENSES NPF-4 AND NPF-7 NORTH ANNA POWER STATION UNIT NOS. 1 AND 2 PROPOSED TECHNICAL SPECIFICATIONS CHANGES Pursuant to 10CFR50.90, the Virginia Electric and Power Company requests an amendment, in the form of changes to the Technical Specifications, to Operating License Nos. NPF-4 and NPF-7 for the North Anna Power Station Unit Nos. I and 2.

The Technical Specifications limits for quadrant power tilt ratio provide linear heat rate and DNBR protection for the reactor fuel.

However, the reduction of 3 percent reactor power for each 1% by which quadrant tilt exceeds its limit, which is required by Technical Specification 3.2.4, could provide excessive margin between the actual hot channel factor values, and the limits identified in Specifications 3.2.2 and 3.2.3. The additional provision to perform full-core flux mapping, in order to measure the explicit values for the Fgand FAH hot channel factors, will identify the margin available with respect to the

! Technical Specifications limits for these hot channel factors. Flux mapping and the associated power level adjustment would be applicable l only during the first 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the quadrant power tilt ratio exceeds 1.02. If the quadrant tilt cannot be returned within its limit within the first 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, then the power reduction to 50% power would be required.

This request has been reviewed and approved by the Station Nuclear Safety and Operating Committee and the Safety Evaluation and Control Staff. It has been determined that this request does not involve an unreviewed safety question as defined in 10CFR50.59.

These proposed changes do not pose a significant hazards consideration as defined in 10CFR50.92. Example iv in the Federal Register dated April 6, 1983, Page 14870, partially states, "A relief granted upon demonstration of acceptable ope ~ation from an operating 1

8311290046 831118 $6 PDR ADOCK 05000338 P PDR 9 f* 00 i

restriction that was imposed because acceptable operation was not yet demonstrated." The additional flux mapping provided in this proposed change, in lieu of power reductions, in the presence of a quadrant power tilt above 1.02, will provide the necessary linear heat rate and DNBR protection for the reactor core. Thus, the proposed change does not pose a significant hazards consideration.

We have reviewed this request in accordance with the criteria in 10CFR170.22. Since this request involves a safety issue which the Staff should be able to determine does not involve a significant hazards consideration for Unit 1 and a duplicate safety issue for Unit 2, a Class III. license amendment fee and a Class I license amendment fee are required for Unit 1 and Unit 2, respectively. A voucher check in the amount of $4,400'i.s enclosed in. payment of the required fees.

Very truly yours, W. L. Stewart Attachments

1. Proposed Technical Specification Changes-Unit 1

2. Proposed Technical Specification Changes-Unit 2

3. Discussion of Proposed Technical Specification Changes

4. Voucher Check for $4,400.00 cc: Mr. James P. O'Reilly Regional Aministrator Region II Mr. M. B. Shymlock NRC Resident Inspector North Anna Power Station Mr. Charlie Price Department of Health 109 Governor Street Richmond, Virginia 23219

COMMONWEALTH OF VIRGINIA )

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CITY OF RICHMOND )

The foregoing documer.t was acknowledged before me, in and for the City and Consonwealth aforesaid, today by W. L. Stewart who is Vice President -

Nuclear Operations, of the Virginia Electric and Power Company. He is duly authorized to execute and file the foregoing document in behalf of that Company, and the statements in the document are true to the best of his knowledge and belief.

TL Acknowledged before me this /f day of Ne A - ,19 P1 .

My Commission expires: 4-A# , 19 2I .

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