ML20066H670

Application for Amends to Licenses NPF-4 & NPF-7,changing Tech Specs to Allow Improvements to Monthly Auxiliary Feedwater Pump Tests,Per NRC Concerns Noted in Response to NRC Bulletin 88-004 Re Hydraulic Pump Instability

ML20066H670
Person / Time
Site:	North Anna
Issue date:	02/14/1991
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20066H678	List: ML20066H670 ML20066H692
References
91-057, 91-57, IEB-88-004, IEB-88-4, NUDOCS 9102210237
Download: ML20066H670 (3)

Text

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i ;, f Of- .- NIHOINIA ELECTIllC AND POWT lt COMPANY Ricitwoxo,VinotutA enent

, i February 14,1991 o

i LU.S. N'uclear Regulatory Commission Serial No.: 91 057

' Attention: Document Control Desk NL&P/RMN Washington, D.C. 20555 ' Docket Nos.: 50 338 q

50 339 License Nos.: NPF 4 N PF , ,

Gentlemen:

1^ '

VIRGINIA- ELECTRIC' ANu POWER COMPANY NORTH ANNA' POWER STATION UNITS 1 AND 2 '

= PROPOSED- TECHNICAL SPECIFICATION CHANGES AUXILIARY FEEDWATER PUMP TESTING Pursuant 10:10 CFRl 50.90, the Virginla= Electric and Power Company requests Lamen.dments, in the form?of changes to the Technical Specifications, to Operating

' License Numbers NPF-4 and NPF-7 for North Anna Power Station Units 1 and 2, respectively,' j 1The' proposed changes to the North Anna Units 1 and 2 Technical Specifice,tions will allow improvements to.the monthly auxiliary feedwater pump tests. These changes-are !ntended to replace our December 28,1989 request (letter serial nusbar 89-833).

NRC Bulletin 88-04 " Safety Related Pump Loss" identified uncerns with hydraulic instability in pumps operating near their shut off heads, in our August 8,1988 reply to

- that bulletin we committed to disassembling and inspecting the auxiliary feedwater '

, . pumps and to mir,!mize operation at low flow. The inspections indicated that some - ,

idegradation had occurred which was not revealed by the high pressure-low flow 4 testing. The pumps have since been overhauled and our. quarterly ASME Section XI

' testing procedures have been revised to allow full flow tests. . A new full flow recirculation line was added during the latest Unit 2 refueling outage and is being ,

installed during the current Unit 1 outage to permit full flow testing e' power without affecting the steam' generators or normal feedwater regulation. Ou, quarterly Section 4 Xl testing is now done at flow conditions near the pump's best efficiency point. This lost p,ovides early warning of degradation and is similar to conditions when the pump p Lis perfc rming its safety function. If the monthly test could be done under similar p conditions, safety we. Id be enhanced because there would be less pump wear and more effective testing.

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" '9102210237 910214 '

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This does not affect our MERITS submittal, tharefore a MERITS change is not attached.

LThe proposed; changes are provided in Attachments 1 and 2. A discussion of the

. L proposed changes:with the technical justification and safety evaluation of the

. proposed changes is provided in Attachment 3.-

Th!s requestihas 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 o_r a significant hazards consideration as defined in 10 CFR 50.92. The basis for jour determinglon that no significant hazards consideration is involved is presented in

' Attachment 4.

Because of the need .to revise procedures, please allow us 60 days to implement

these changes from the' dates of issuance. Should you have any questions or require l

' additional information, please contact us at your earliest convenience.

> Very truly ud2;rs,

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W.' L. Ste

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Senior Vich President - Nuclear

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? Attachments 4 1. . Proposed Technical Specification Change for North Anna Unit 1 i2. Proposed Technical Specification Change for. North Anna Unit 2 rt >

3. Discussion of Proposed Changes: ,

14.110 CFR 50.92 Evaluation cc:' LU.S.~ Nuclear _ Regulatory Corrmiss on

<  ; Region il

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- 101 Madetta Street, N.W. :

Suite 2900-LAtlanta, GA- 30323 Mr. M. S. Lesser

,. -NRC Senior. Resident inspector 1 North Anna Power Stdion 3

Commissioner.

-Department of Health j

Room 400 109 Governor Street

,g Richmond, Virginia .23219 I

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s E COMMONWEALTH OF VIRGINIA )

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. COUNTYOFHENRICO )

, Ths . foregoing.. document was -.. acknowledged _ before me, in -and. for the-County and; Commonwealth aforesaid, today by. E. W. Harrell, who is Vice

- President - 1 Nuclear -- Operations, for W. L. Stewart, who is Senior Vice' c

. President.- Nuclear, of xVirginia Electric and Power Company. He is duly j authorized, to executeLand file the foregoing document in behalf of that c

Company,' .andLthe. statements in the document are true to the best of his k.nowledge and belief.

' Acknowledged : before me' this. ./ day of t. //IAaat , 19_f_/

ii..y Commission ; Expires .

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