ML19350A645

Application to Amend License NPF-4,changing App a Tech Spec Table 3.7-4 to Reflect multi-structure Amplified Response Spectrum Reanalysis.Changes Delete Four Snubbers & Add One. Class III Fee Encl

ML19350A645
Person / Time
Site:	North Anna
Issue date:	03/12/1981
From:	Ferguson J VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	Clark R, Harold Denton Office of Nuclear Reactor Regulation
Shared Package
ML19350A646	List: ML19350A645 ML19350A655
References
119, NUDOCS 8103160602
Download: ML19350A645 (3)

Text

I VIMUINIA ELEcrHIC ANI) I'OWEH COM IWNY -

Hacuxoxn. Vruoix A 2020 Q

, ~

March 12, 1981 / 6

. . . . n. . - -

Esecurrava Vars Pmmesesst g 4

'g.

Mr. Harold R. Denton, Director Serial No. - '

Office of Nuclear Reactor Regulation N0/DCW:ms Attn: Mr. Robert A. Clark, Chief Docket No. 50-338 Operating Reactors Branch No. 3 License No. NPF-4 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Gentlemen:

AMENDMENT TO OPERATING LICENSE NPF-4 NORTH ANNA POWER STATION UNIT NO. 1 Pursuant to 10 CFR 50.90, the Virginia Electric and Power Cowpany requests an amendment, in the form of changes to the Technical Specifications, to Operat-ing License No. NPF-4 for the North Anna Power Station, Unit No. 1. The proposed changes are enclosed.

As a result of the Multi Structure Amplified Response Spectrum (ARS) reanaly-sis presently underway for North Anna Unit 1 it has been determined that an existing snubber at location WFPD-H-225, outside the crane wall, be moved to location WFPD-H-600, inside the crane wall. This requires the deietion of snubber 225 and the addition of snubber 600 in Table 3.7-4 of North Anna Unit 1 Technical Specification 3/4.7.10.

The relocation of this snubber does not decrease the margin of safety, in that at the new location the snubber will provide greater support for the piping for applicable loads to be expected during a seismic event or during accident conditions as determined in the continuing reanalysis.

Also, as a result of the ARS reanalysis additional modifications were made to the supports for feed water piping to accommodate pipe stress and loading.

Consequently, snubbers WFPD-HSS-232, 233, and 234 are no longer necessary and will be removed. This requires the deletion of snubbers 232, 233, and 234, at location FW-300-SB, from Table 3.7-4 of North Anna Unit 1 Technical Specifi-cations 3/4.7.10.

The combination of the piping support modifications and the deletion of these snubbers does not decrease the margin of safety in that the stress and applicable loads on the piping expected during a seismic event or during accident conditions will be reduced.

The removal of additional snubbers, if there bc any, will be processed as a supplement to this amendment request. It is our intent at this time to incor-porate any snubbers to be added to Table 3.7-4 in our response to Revision 1 of the Inservice Surveillance Requirements for snubbers as addressed in your letter of November 20, 1980.

8108160 M P

Va moin A EtscTaic Amp Powen COMPAMT TO 2 This request has been reviewed and approved by the Station Nuclear Safety and Operating Committee and the System Nuclear Safety and Operating Committee.

It has been determined that this request does not involve an unreviewed safety question.

We have reviewed this request in accordance with the criteria in 10 CFR 170.22. It has been determined that this request involves a single safety issue, therefore a Class III license amendment fee is required. Accordingly, a voucher check in the amount of $4,000.00 is enclosed in payment of the required fee.

Since approval of this request is required in order for North Anna Unit I to resume power operation, we would appreciate your prompt review of this request.

Very truly yours, 44J d J. H. Ferguson Executive Vice President Power Attachments:

1. Proposed Technical Specification Change

2. Voucher Check No. 9918 for $4,000.00 cc: Mr. James P. O'Reilly, Director Office of Inspection and Enforcement Region II

COMMONWEALTH OF VIRGINIA )

) s. s.

CITY OF RICHMOND )

Before me, a Notary Public, in and for the City and Common-wealth aforesaid, today personally appeared J. H. Ferguson, who being duly sworn, made oath and said (1) that he is Executive Vice President-Power, of the Virginia Electric and Power Company, (2) that he is duly authorized to execute and file the foregoing Amendment in behalf of that Company, and (3) that the statements in the Amendment are true to the best of his knowledge and belief.

Given under my hand and notarial seal this 11 % day of match , .L%L.

!!y Commission expires ha4tAULt% /4, /9k} .

V U '

AAf 4L

• L) NotaryPglic, (L arv> CennlacuA &> E DLuw a) l (SEAL) i u_