ML20127D807

Forwards Request for Addl Info Re Response to Generic Ltr 83-28,Items 4.1,4.2.1 & 4.2.2.Response Requested within 60 Days of Ltr Receipt

ML20127D807
Person / Time
Site:	Wolf Creek
Issue date:	05/09/1985
From:	Youngblood B Office of Nuclear Reactor Regulation
To:	Koester G KANSAS GAS & ELECTRIC CO.
References
GL-83-28, TAC-57380, NUDOCS 8505170044
Download: ML20127D807 (9)

Text

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NAY 0 91985 Docket No.: STN 50-482 Mr. Glenn L. Koester Vice President - Nuclear Kansas Gas and Electric Company 201 North Market Street Post Office Box 208 Wichita, Kansas 67201 "

Subject:

Request for Additional Information Regarding Generic Letter 83-28 (Items 4.1, 4.2.1, and 4.2.2)

The NRC staff is continuing its review of KG8E's response to Generic Letter 83-28. The information requested in the enclosure to this letter is neces-sary to permit the staff to complete its review.

Please provide the requested information within 60 days of your receipt of this letter.

Sincerely, B. JI Y ungblood, Chief Licensing Branch 1 Divisinn of Licensing

Enclosure:

As stated cc: See next page t

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....../ NAY 0 S 1985 Docket No.: STN 50-482 Mr. Glenn L. Koester Vice President - Nuclear Kansas Gas and. Electric Company 201 North Market Street.

Post Office Box'208 Wichita, Kansas 67201

Subject:

Request for Additional Information Regarding Generic Letter 83-28-(Items 4.1, 4.2.1, and 4.2.2)

The NRC staff is continuing its review of KG&E's response to Generic Letter 83-28. The information requested in the enclosure to this letter is neces-sary to permit the staff to complete its review.

Please provide the requested information within 60 days of your receipt of this letter.

Sincerely, -

, ,W B .' . oungblohd, Chi 6f Li n ing Branj.h 1 Di is on of Licensing

Enclosure:

As stated cc: See next page

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. . MAY 0 91985 WOLF CREEK Mr. Glenn L. Koester Vice President - Nuclear Kansas Gas and Electric Company 201 North Market Street Post Office Box 208 Wichita, Kansas 67201 cc: Mr. Nicholas A. Petrick Ms. Wanda Christy Executive Director, SNUPPS 515 N.1st Street 5 Choke Cherry Road Burlington, Kansas Rockville, Maryland 20850 C. Edward Peterson, Esq.

Jay Silberg, Esq. Legal Division Shaw, Pittman, Potts & Trowbridge Kansas Corporation Commission 1800 M Street, N. W. State Office Building, Fourth Floor Washington, D. C. 20036 Topeka, Kansas 66612 Mr. Donald T. McPhee John M. Simpson, Esq.

Vice President - Production Attorney for Intervenors Kansas City Power & Light Company 4350 Johnson Drive, Suite 120 1330 Baltimore Avenue Shawnee Missinn, Kansas 66205 Kansas City, Missouri 64141 Regional ~ Administrator Ms. Mary Ellen Salava U. S. NRC, Region IV Route 1, Box 56- 611 Ryan Plaza Burlington, Kansas 66839 Suite 1000 Arlington, Texas 76011 A. Scott Cauger Assistant General Counsel Mr. Allan Mee Public Service Commission Project Coordinator

, P. O. Box 360 Kansas Electric Power Cooperative, Inc.

Jefferson City, Missouri 65101 Post Office Box 4877 Gage Center Station Mr. Howard Bundy Topeka, Kansas 66604 Resident Inspector / Wolf Creek NPS c/o U.S.N.R.C Regional Administrator Post Office Box 311. U.S.N.R.C. - Region III Burlington, Kansas 65839 799 Roosevelt Road

. Glen Ellyn, Illinois 60137 Mr. Robert M. Fillmore State-Corporation Commission Brian P. Cassidy, Regional Counsel State of Kansas Federal Emergency Management Agency Fourth Floor, State Office Bldg. Region I Topeka, Kansas 66612 J. W. McCormack P0CH Boston, Massachusetts 02109 l

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MAY 09 E85 WOLF CREEK cc: Terri Sculley, Director Special Projects Division Kansas Corporation Commission State Office Building, Fourth Floor Topeka, Kansas 66612 Mr. Gerald Allen Public Health Physicist Bureau of Air Quality & Radiation Control Division of Environment Kansas Dept.sof Health & Environment Forbes Field Bldg. 321 Topeka, Kansas 66620 Mr. Bruce Bartlett Resident Inspector / Wolf Creek NPS c/o U.S.N.R.C Post Office Box 311 Burlington, Kansas 66839

ENCLOSURE WOLF CREEK GENERATING STATION REQUEST FOR ADDITIONAL INFORMATION GL 83-28, ITEMS 4.1, 4.2.1 AND 4.

2.2 INTRODUCTION

~ Kansas Gas and Electric Company, the applicant for Wolf Creek Generating Station, submitted their response to Generic Letter 83-28 on' November 15, 1983. 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 4.1, 4.2.1 and 4.2.2.

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1. Item 4.1 - Reactor Trip System Reliability (Vendor-Related Modifications).

The applicant states that " Reactor trip breaker modifications are scheduled to be implemented by fuel load."

The applicant did not commit that all vendor-recommended reactor trip breaker modifications will be implemented. The applicant is to either:

1. Verify that each modification has been implemented; or

2. Provide a written evaluation of the technical reasons for not implementing any vendor recommended modification.

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

2.1 Criteria for Evaluating Compliance with Item 4.2.1 The Wolf Creek Generating Station Reactor Trip System utilizes Westinghouse 05-416 circuit breakers. The primary criteria for an acceptable maintenance program for the D5-416 Reactor Trip B.reaker (RTB) are contained in Westinghouse Maintenance Manual for the DS-416 Reactor Trip Circuit Breaker, Revision 0, October 1984. The NRC staff, Equipment Qualification Branch, has reviewed this document

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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.

2.2 Issues Relating to Item 4.2.1 The applicant's response states that "the preventive maintenance and surveillance programs to ensure reliable

, reactor trip b.reaker operation will be defined for the DS-416 (Wolf Creek) breakers in the Westinghouse Maintenance Manual. This manual will be issued to Westinghouse Owners shortly after completion of life-cycle testing under a WOG program. Life-cycle testing is currently scheduled for completion in June 1984."

The Wolf Creek Generating Station periodic maintenance program for the reactor-trip breakers should include, on a six-month basis (or when 500 breaker operations have been counted, whichever comes first):

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1. General inspection to include checking of breaker's cleanliness, all bolts and nuts, pole bases, arc chutes, insulating link, wiring and auxiliary switches;

2. The retaining rings inspection, including those on the undervoltage trip attachment (UVTA) and shunt trip attachment (STA);

3. Arcing and main contacts inspection as specified by the Westinghouse Maintenance Manual;

4. UVTA check as specified by the Westinghouse Maintenance Mantal, J:- including replacement of UVTA if dropout voltage is greater than 60% or less than 30% of rated UVTA coil voltage;

5. STA check as specified by the Westinghouse Maintenance Manual;

6. Lubrication as specified by the Westinghouse Maintenance Manual;

7. Functional check of the breaker's operation prior to returning it

-to service.

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The Wolf Creek Generatin'g Station Periodic Maintenance Program for the reactor trip breakers should include, 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. RTB dusting and cleaning;

3. Post-cleaning. insulation resistance measurement and recording, as specified by the Westinghouse Maintenance Manual; 3

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4. Inspection of main and secondary disconnecting contacts, bolt tightness, secondary wiring, mechanical parts, cell switches, instruments,_ relays and other panel mounted devices;

5. UVTA trip force and breaker load check as specified by the Westinghouse Maintenance Manual;

6. Measurement and recording RTB response time for the undervoltage trip;

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

Themdinten'anceprocedureshouldincludeacautiontothemaintenance personnel against undocumented adjustments or modifications to RTBs.

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

3. Item 4.2.2 - Trending of Reactor Trip Breaker Parameters to Forecast Degradation of Operability.

3.1 Criteria for Evaluating Compliance with Item 4.2.2 Four parameters have been identified as trendable and are included in the criteria for evaluation. These are r

(a) undervoltage trip attachment dropout voltage, (b) trip force, (c) breaker response time for undervoltage trip, and (d) breaker insulation resistance.

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3.2 Issues Relating to Item 4.2.2 The applicant did not commit to trend the four parameters identified in the criteria for evaluating compliance with Item 4.2.2. At the present time, the NRC requires this trending data to forecast the reactor trip breakers degradation of operability. The applicant is to commit to inclusion of trip force, breaker response time and dropout voltage for undervoltage trip and breaker insulation resistance as trending parameters. The applicant should also identify the organization which will perform the trend analysis how often the analysis will be performed and how

_ - _ the information derived from the analysis will be used to affect periodic maintenance.

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