ML20079P892

Application for Amend to License NPF-4,revising Tech Specs to Ensure Correct Measurement Range of Trixial Response Spectrum Recorders Is Reflected in Appropriate Table

ML20079P892
Person / Time
Site:	North Anna
Issue date:	11/07/1991
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20079P896	List: ML20079P892 ML20079P899
References
91-658, NUDOCS 9111140142
Download: ML20079P892 (5)

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i' VIRGINIA ELI:cTule AND Powrn CosteANY RICil%1oND, Yll:GINIA 23261 November 7, 1991 U.S. Nuclear Regulatory Commission Serial No. 91- 658

- Attention: Document Control Desk NAPS /JYR Washington, D.C. 20555 Docket Nos. 50 338 License Nos. NPF-4 Gentlemen:

VIRGINIA ELECTRIC AND POWER COMPANY NORTH AN.NA POWER STATION UNIT 1 PROPOSED TECHNICAL SPECIFICATION CHANGES Pursuant to 10 CFR_50.90, the Virginia Electric and Power Company requests amendments, in the form of changes to the Technical Specifications, to Operating License Number NPF-4 for North Anna Power Station Unit 1. The

_ proposed _ changes will revise the current Technica! Specifications to ensure the correct measurement range of the triaxial response spectrum recorders is reflected in the appropriate Technical Specification table.

A discussion of-the proposed changes is provided in Attachment 1. The proposed changes are presented in Attachment 2 for Unit 1- .

This request has been reviewed by the Station Nuclear Safety and Operating Committee and the Management-Safety Review Committee. It has been

- determined that this request does not involve an unreviewed safety question as

. defined in 10 CFR 50.59 or a significant hazards consideration as defined in 10 CFR 50.92. The- basis for our determination.that no cignification hazards consideration is involved is presented in Attachment 3.

Should you have any questions or require additional information, please contact us at your earliest convenience.

Very truly y r;, ,

Yt w-W. L. wart Senior Vice President - Nuclear 9111140142 911107 gDM ADOCK 0300 8 g/

- Attachments

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1. Discussion of Proposed Changes

2. Proposed Technical Specification Change for North Anna Unit 1

3. 10 CFR 50.92 Evaluation cc: U.S. Nuclear Regulatory Commission Region 11 101 Marietta Street, N.W.

Suite 2900 -

Atlanta, GA 30323 Mr. M. S. Lesser NRC Senior Resident inspector North Anna Power Station Commissioner Department of Health Room 400 109 Governor Street Richmond '" qinia 23219 l-l L

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. COMMONWEALTH OF VIRGINIA )

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COUNTYOF HENRICO )

The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by E. W. Harrell, who is Vice President - Nuclear Operations, for W. L. Stewart, who is Senior Vice President -- Nuclear, of Virginia Electric and Power Company. He is duiy 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.

Acknowledged before me this "\ day of N oW Ac, , 19"\\.

My Commission Expires. b u d '6 ' _ , 1 9 M )

\(ubc u hIl\Slt.

Notary Pbblic (SEAL)

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Attachment 1 1

Discussion of Proposed Changes North Anna Unit 1 d

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j. Virginia Electric and- Power Company.

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DISCUSSION OF PROPOSED CHANGF.S Introductl9.D As previously documented by letter dated April 18,1991 (Virginia and Electric Power Company Serial No.91-205), we determined that our May 27,1986 license amendment request (issued as Amendment 80), which established the current measurement range requirements of the triaxial response spectrum recorders, was in error. This request included requirements which were inconsistent with the frequency range of the existing instrumentation as specified in the Updated Final Safety Analysis Report (UFSAR) Chapter 3, Design Crite.ria Appendix A, Comoliance With Safety Guides which confirmed our compliance, with several exceptions, to Regulatory Guide 1.12, Instrumentation for Earthauakes. One specific exception taken in that appendix is the triaxial response spectrum recorder frequency measurement range of 2-25.4 Hz instead oi the 1-30 Hz range specified in the Regulatory Guide.

Background

A seismic instrumentation program is provided to monitor and record input motion and behavior of major Seismic Class 1 structures and components of Unit 1 during a seismic event. Included in this program are four triaxial response spectrum recorders.

Technical Soecification Chanoes General The Technical Specification changes described herein apply to North Anna Unit 1 only.

Technical Soecification Table 3.3-7 The measurement range of items 4a,4b,4c, and 4d, have been changed from between 130 Hz to between 2 and 25.4 Hz. This change is necessary to reflect the range of four triaxial response spectrum recorders. Specifically, the change is being made to reflect the range of the instrumentation originally installed in the plant and excepted from Regulatory Guide 1.12, Revision 1, dated April 1974, as noted in Section 3A.12 of the UFSAR.

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