ML20137G555

Requests Addl Info Re Generic Ltr 83-28,Items 4.1,4.2.1 & 4.2.2 Concerning Reactor Trip Sys Reliability & Preventive Maint Program for Reactor Trip Breakers/Maint & Trending

ML20137G555
Person / Time
Site:	Beaver Valley
Issue date:	08/08/1985
From:	Knighton G Office of Nuclear Reactor Regulation
To:	Carey J DUQUESNE LIGHT CO.
References
GL-83-28, TAC-62948, TAC-62949, NUDOCS 8508270334
Download: ML20137G555 (7)

Text

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. AUG 8 1985

~* Docket No.: 50-412 Distribution

Docket File JPartlow NRC PDR BGrimes LPDR EJordan PRC System Mr. John J. Carey NSIC Vice President, Nuclear LB#3 Reading Duquesne Light Company JLee Robinson Plaza Building, No. 2, Suite 10 BKSingh PA Route 60 OELD, Attorney Pittsburgh, Pennsylvania 15205 ACRS (16)

Subject:

REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING GL 83-28 ITEMS - BEAVER VALLEY UNIT 2

' Enclosed please find the RAI relating to items 4.1, 4.2.1, and 4.2.2 of Generic Letter 83-28. These items are also referred to as Reactor Trip System Reliability and Preventive Maintenance Program for Reactor Trip Breakers / Maintenance and Trending. Your prompt response to these requests will expedite the resolution of this issue.

Should you have any questions concerning the enclosed requests, please contact the Project Manager, B. K. Singh at 301-492-8423.

Sincerely, Orig!nalsf aed by:

George W.6Knightca George W. Knighton, Chief Licensing Branch No. 3 Division of Licensing

Enclosure:

As stated cc: See next page

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Concurrence: LB#3/DL L fDL BKSingh 4W' ighton 8/ 6 /85 8/ 7 /85 8508270334 850808 PDR ADOCK 05000412 PDR

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Beaver Valley Mr. John J. Carey Vice President, Nuclear Duquesne Light Company Robinson Plaza Building, No. 2, Suite 110 ,

PA Route 60 t Pittsburgh,-Pennsylvania 15205 Gerald Charnoff, Esq. Mr. R. E. Martin, Manager Engineerinq  !

Jay E. Silberg, Esa. Beaver Valley Two Pro.iect Shaw, Pittman, Potts & Trowbridge Duquesne Light Company .

1800 M Street, N.W. Robinson Plaza Buildina No. 2, Suite 110 Washington, DC 20036 PA Route 60 Pittsburgh, Pennsylvania .-15205 Mr. C. W. Ewing, Quality Assurance Zori Ferkin Manager Assistant Counsel Quality Assurance Department Governor Energy Council Duquense Light Company 1625 N. Front Street -

P. O. Box 186 Harrisburg, PA 15105' Shippingport, Pennsylvania 15077 '

Mr. John J. Carey Vice President, Nuclear L Duquense Light Company Director, Pennsylvania Emergency P. O. Box 4 Management Agency Shippingport, Pennsylvania 15077 Room B-151 Transportation & Safety Building Harrisburg, Pennsylvania 17120 Mr. T. J. Lex _ Mr. Thomas Gerusky Westinghouse Electric Corporation Bureau of Radiation Protection Power Systems PA Department of Environmental P. O. Box 355 Resources Pittsburgh, Pennsylvania 15230 P, O. Box 2063 Harrisburg, Pennsylvania 17120 Mr. P. RaySircar Stone & Webster Engineering Corporation BVPS-2 Records Management Supervisor P. O. Box 2325 Duquesne Light Company Boston, Massachusetts 02107 Post Of fice Box 4 Shippingport, Pennsylvania 15077 Mr. Glenn Walton U. S. NRC John A. Lee, Esq.

P . O. 181 Duauesne Light Company Shippingport, Pennsylvania 15077 1 0xford Centre 301 Grant Street Mr. Thomas E. Murley, Regional Admin. Pittsburgh, Pennsylvania 15279 U. S. NRC, Region I 631 Park Avenue King of Prussia, Pennsylvania 15229

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l . Mr. E. F. Kurtz , Jr. , Manager Regulatory Affairs Beaver Valley Two Pro.iect Duquense Light Company Robinson Plaza Buidling No. 2 Suite #210 PA Route 60 Pittsburgh, Pennsylvania 15205 l

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BEAVER VALLEY POWER STATION, UNIT 2 REQUEST FOR ADDITIONAL INFORMATION

. GL 83-28, ITEMS 4.1, 4.2.1 AND 4.2.2'.' -

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r INTRODUCTION Duquesne Light, the applicant for Beaver Valley Power Station, Unit 2, submitted their response to Generic Letter 83-28 on March 30, 1984. The response has been reviewed with respect to Items 4.1, 4.2.1 and 4.2.2 of the Generic Letter. The applicant's response was not sufficiently detailed to permit an evaluation of the adequacy of the periodic maintenance and trending programs for the breakers. The following additional information is required to evaluate compliance with Items 4.2.1 and 4.2.2.

I. Item 4.2.1 - Periodic Maintenance Program for Reactor Trip Breakers.

Criteria for Evaluatine Comoliance with Item 4.2.1 The Beaver Valley. Unit 2 Reactor Trip System utilizes Westinghouse 05-416 circuit' breakers. The primary criteria for an acceptable maintenance program for the DS-416 Reactor Trip Breaker (RTB) are contained in Westinchouse Maintenance Manual for the 05-416 Reactor Trip Circuit Breaker, Revision 0, October 1984. The NRC staff, Equipment Qualification Branch, has reviewed this document and endorsed the maintenance program described in it. More specifically, the criteria used to evaluate compliance include those items in this document that relate to the safety function of the breaker, supplemented by those measures that must be taken to accumulate data for trending. -

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, Issues Relatino to Item 4.2.1

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.. Theapplicant'sresponsestatesthatheUill'reviewthe Westinghous'e program and adopt the preventive maintenance recommendations determile'd necessary to maintain the reactor trip breakers.

The Beaver Valley Unit 2 periodic maintenance program for the reactor trip breakers should include, on a six-month basis (or when 500 breaker operations have been co0nted, whichever comes first):

1. The retaining rings inspection, including those on the under-voltage trip attachment (UVTA) and shunt trip attachment (STA);

2. Arcing and main contacts inspection as specified by the Westinghcuse Maintenance Manual;

3. UVTA check as specified by the Westinghouse Maintenance Manual, including replacement of UVTA if dropout voltage is greater than 60% or less than 30% of rated UVTA coil voltage;

4. STA check as specified by the Westinghouse Maintenance Manual; s 5. Lubrication as specified by the Westinghouse Maintenance Manual; The applicant should confirm that his Periodic Maintenance Program for the reactor trip breakers includes, on a refueling interval basis (or when 500 breaker operations have been counted, whichever comes first):

1. Pre-cleaning insulation resistance measurement and recording;

2. Post-cleaning insulation resistance measurement and recording, as

.specified by the Westinghouse Maintenance Manual; 2

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3. Inspection of main and secondary disconnecting contacts, bolt tightness, secondary wiring, mechanical parts, cell switches, '

. instruments, relays and other panel mounted de vices;.

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4. UVTA trip force and breaker P6ad check as specified by the Westinghouse Maintenance Manual;

5. Functional test of the breaker prior to returning to service as specified by the Westinghouse Maintenance Manual.

The maintenance procedure should include a caution to the maintenance personnel against undocumented adjustments or modifications to RT8s.

The applicant is to confirm that the periodic maintenance program includes these ten items at the specified intervals or commit to their inclusion.

II. Item 4.2.2 - Trending of Reactor Trip Breaker Parameters to Forecast Degracilion of Operability.

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Criteria for Evaluatino Compliance with Item 4.2.2 Four parameters have been identified as trendable and are included in the criteria for evaluation. These are (a) undervoltage trip attachment dropout voltage, (b) trip force, (c) breaker response time for undervoltage trip, and (d) breaker insulation resistance.

Issues Relatino to Item 4.2.2 The applicant states that he will trend the " breakers operational response time." Any significant degradations -

found will be' identified to Operations, Maintenance, and Upper Management for corrective action.

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It is not clear what the applicant means by " breakers operational response time" The hpplicant is to commit to inclusion of trip force, breaker response' tiTne for

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undervoltage trip, dropout voltage for undervoltage trip and

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breaker insulation resistance as trending parameters.

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