ML20116K701

Forwards Safety Evaluation Re 831104 & 850215 Responses to Generic Ltr 83-28,Items 4.2.1 & 4.2.2 Concerning Preventative Maint Program for Reactor Trip Breakers/Maint & Trending.Positions on Items 4.2.1 & 4.2.2 Acceptable

ML20116K701
Person / Time
Site:	North Anna
Issue date:	04/24/1985
From:	John Miller Office of Nuclear Reactor Regulation
To:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
Shared Package
ML20116K706	List: ML20116K701
References
GL-83-28, NUDOCS 8505030362
Download: ML20116K701 (2)

Text

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April 24, 1985 Docket Nos. 50-338 and 50-339 y

Mr. W. L. Stewart Vice President - Nuclear Operations Virginia Electric and Power Company Post Office Box 26666 Richmond, Virginia 23261

SUBJECT:

GENERIC LETTER 83-28, ITEMS 4.2.1 AND 4.2.2 - PREVENTATIVE MAINTENANCE PROGRAM FOR REACTOR TRIP BREAKERS / MAINTENANCE AND TRENDING - NORTH ANNA POWER STATION, UNITS N0. 1 AND NO. 2 (NA-1&2)

By letters dated November 4,1983 and February 15, 1985, VEPC0 responded to Generic Letter 83-28.

The enclosed Safety Evaluation (SE) was prepared b our technical contractor, the Idaho National Engineering Laboratory (INEL)y As stated in the SE, your positions on Items 4.2.1 and 4.2.2 are acceptable.

We have reviewed the INEL SE and concur with its conclusions. Therefore, this matter is closed for NA-1&2.

Sincerely, 01shm?WgM y James R. Miller, Chief Operating Reactors Branch No. 3 Division of Licensing

Enclosure:

Safety Evaluation cc w/ enclosure:

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North Anna Nuclear Power Station Virginia Electric & Power Company Richard M. Foster, Esquire Mrs. Margaret Dietrich Musick, Williamson, Schwartz, Route 2, Box 568 Leavenworth & Cope, P.C.

Gordonsville, Virginia 22042 P. O. Box 4579 Boulder, Colorado -80306 Mr. Paul W. Purdom Environmental Studies Institute Michael W. Maupin, Esquire Drexel University Hunton, Williams, Gay and Gibson 32nd and Chestnut Streets P. O. Box 1535 Philadelphia, Pennsylvania 19104 Richmond, Virginia 23212 Atomic Safety and Licensing Appeal Mr. W. T. Lough Board Panel Virginia Corporation Commission U.S. Nuclear Regulatory Commission Division of Energy Regulation Washington, DC 20555 P. O. Box 1197 Richmond, Virginia 23209 Regional-Administrator USNRC, Region II Ellyn R. Weiss, Esquire Office of Executive Director Sheldon, Harman, Roisman and Weiss for Operations 1725 I Street, N.W., Suite 506 101 Marietta Street N.W., Suite 2900 Washington, DC 20006 Atlanta, Georgia. 30323 Mr. E. W. Harrell Mr. J. H. Ferguson P. O. Box 402 Executive Vice President - Power Virginia Electric and Power Co.

Mineral, Virginia 23117 Post Office Box 26666 Richmond, Virginia 23261 Old Dominion Electric Cooperative e/o Executive Vice President Mr. Anthony Gambardella Innsbrook Corporate Center Office of the Attorney General 4222 Cox Road, Suite 102 Supreme Court Building Glen' Allen, Virginia 23060 101 North 8th Street Richmond, Virginia 23219 Mr. Richard C. Klepper

. Resident Inspector / North Anna Board of Supervisors c/o U.S. NRC Louisa County Courthouse Senior Resident Inspector P. O. Box 27 Route 2, Box 78 Louisa, Virginia :23093 Mineral, Virginia 23117

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SAFETY EVALUATION NORTH ANNA POWER STATION, UNITS 1 AND 2 DOCKET NOS. 50-338 AND 50-339 REACTOR TRIP RELIABILITY ITEMS 4.2.1 AND 4.2.2 0F GENERIC LETTER 83-28 F. G. Farmer f

4 Published April 1985

~EG&G Idaho, Inc.

Idaho Falls, Idaho 83415' 1

Prepared for the

-U.S. Nuclear Regulatory Commission.

-Washington, D.C.

20555 Under DOE Contract No.'DE-AC07-76ID01570-FIN No. A6814 i

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-s SAFETY EVALUATION NORTH ANNA POWER STATION, UNITS 1 AND 2 DOCKET NOS. 50-338 AND 50-339 ITEMS 4.2.1 AND 4.2.2 0F GENERIC LETTER 83-28 1.

INTRODUCTION On July 8,1983, the' Nuclear Regulatory Commission-(NRC) issued Generic Letter (GL) 83-28. This letter addressed intermediate-term actions to be taken by licensees and applicants aimed at assuring that a comprehensive program of preventive maintenance and surveillance testing is implemented for'the reactor trip breakers (RTBs) in pressurized water reactors.

In particular, Item 4.2 of the letter required the licensees and applicants to submit a description of their preventive maintenance and surveillance program to ensure reliable reactor trip breaker operation.

The description of the submitted program was to include the following:

GL, Item 4.2.1 A planned program of periodic maintenance, including lubrication, housekeeping, and other items recommended.

by the equipment supplier.

GL, Item 4.'2.2 Trending of parameters affecting operation and measured during testing to forecast degradation of operation.

Virginia Electric and Power Company, the licensee for North Anna, Units 1 and 2, submitted their responses to the Generic Letter on November 4, 1983, and February 15, 1985. This report presents an evaluation of the adequacy of, those responses and of the Licensee's preventive maintenance and surveillance programs for RTBs.

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A 2.

EVALUATION CRITERIA

'2.1 Periodic Maintenance Program

-The primary source for periodic maintenance program criteria is Westinghouse Maintenance Program for 08-50 Reactor' Trip Switchgear,

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Rev. 0.'

This document is the breaker manufacturer's recommended maintenance program for'the DB-50 breaker and provides specific direction with regard to schedule, inspection and testing, cleaning, lubrication, corrective maintenance and record keeping.

The document was reviewed to

. identify those items that contribute to breaker trip reliability consistent l

.with the generic letter. Those items identified for maintenance at six month intervals that should be included in the licensee's RTB maintenance I

program are:

1.

Verification of trip bar freedom

'2.

Verification of operating mechanism alignment and freedom 3.

Retaining ring verification 4

4.

Verification of nut and bolt tightness 5.

Verification of pole bases physical condition 4

6.

Verification of arcing and main contacts physical condition 7.

Verification of insulating link's physical condition 8.

Verification of wiring insulation and termination physical-condition 9.

Verification of arc chute physical condition

10. Verification of breaker cleanliness

11. Undervoltage Trip

Attachment:

(UVTA) dropout voltage test and lubrication.

12. Shuat Trip Attachment (STA) operation verification F

13.. Verification of operation of ~ auxiliary switches 14.

Inspection of positidning lever condition 15.

Functional test of the breaker prior to returning it to service.

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... '..1 The licensee'.s RTB periodic maintenance should also include, on a refueling interval basis:

16. Verification'of cell interlock operation 17.

Examination and cleaning of breaker enclosure

18. Measurement of trip force required

19.. Functional. test of the breaker prior to returning it to service

20. Breaker response time for undervoltage trip.

All of the items listed above are recommended by t'he manufacturer except Item 20. -This item is the breaker trip response time measurement-which is implied by the-IEEE Standard 279-1971.

2.2 Trending of Parameters Generic Letter Item 4.2.2 specifies that the Licensee's preventative maintenance and surveillance program is to include trending of parameters affecting operation and measured during testing to forecast degradation of operation..The parameters measured during the maintenance program.

described above which are applicable for trending are undervoltage trip attachment' dropout voltage, trip force, and breaker response time for undervoltage trip. The staff position is that the above three parameters in addition to the breaker insulation resistance are acceptable and recommended trending parameters to forecast breaker operation degradation j

or failure.

If subsequent experience indicates.that any of thes'e parameters is not useful as a tool to anticipate failures or degradation, I

theflicenseemay,withjustificationandNRC' approval,electto.removethat parameter from those to be tracked.

3.

EVALUATIOg

~3.1 Evaluation of the Licensee Position on-Item 4.2.1 The licensee states that the twenty items detailed in Section 2.1 of

- this SER are included.in the North Anna 'l and 2 maintenance procedures, and 3-7;

that maintenance is performed on a six-month basis. The staff finds the licensee position on Item 4.2.1 to be acceptable.

3.2 Evaluation of the Licensee's Position on Item 4.2.2 The licensee-states that he will trend all four parameters recommended in Section 2.2 of this SER; he as also identified the organization which will perform' trend analysis, how often-it will be performed and how the information derived from the analysis will be used to affect periodic maintenance. _The staff finds.the licensee position on Item 4.2.2 to be acceptable.

4.

CONCLUSIONS Based on a review of the licensee responses, the staff finds the licensee positions on Items 4.2.1 and 4.2.2 of Generic Letter 83-28 to be acceptable.

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