ML20126B646

Forwards Request for Addl Info Re Generic Ltr 83-28,Items 4.1,4.2.1 & 4.2.2 Addressing Reactor Trip Sys Reliability, Including Periodic Maint & Trending Aspects of Preventative Maint Program.Info Needed within 60 Days

ML20126B646
Person / Time
Site:	Catawba
Issue date:	06/04/1985
From:	Adensam E Office of Nuclear Reactor Regulation
To:	Tucker H DUKE POWER CO.
References
GL-83-28, NUDOCS 8506140165
Download: ML20126B646 (7)

Text

. . - _ . -_ -- - _ - . -- - . _ - --

.~

• i

June 4, 1985 DISTRIBUTION

Docket'Nos.c50-413/414 _

Docket Nos: 50-413 NRC PDR 4

and 50-414 Local PDR i PRC System 1

LB #4 r/f EAdensam

.Mr. H. B. Tucker, Vice President MDuncan Nuclear Production Department KJabbour Duke Power Company RHeischman 422 South Church Street NRomney Attorney, OELD Charlotte, North Carolina 28242 KJabbour JPartlow 1

RPerch BGrimes

Dear Mr. Tucker:

GBagchi EJordan

Subject:

Catawba Nuclear Station, Units 1 and 2 - Request for Additional Information Regarding Items 4.1, 4.2.1 and 4.2.2 of Generic ~

Letter (GL) 83-28 The NRC staff and its consultants from Idaho National Engineering Laboratory have reviered your responses to Items 4.1, 4.2.1 and 4.2.2 of GL 83-28. These 4

items address the reactor trip system reliability including the periodic

- maintenance and trending aspects of the preventative maintenance program for reactor trip breakers. Your responses were not sufficiently detailed to permit an evaluation of the items reviewed. Thus, we find that additional

, information, as identified in the enclosure, is needed for the completion of.

our review.

Your reply within 60 days of this letter is requested. Should you have i questions regarding the enclosure or be unable to meet the requested response j date, contact our Licensing Project Manager, Kahtan Jabbour at (301) 492-9789.

l The reporting and/or recordkeeping requirements contained in this letter affect fewer than ten respondents; therefore, OMB clearance is not required under P.L.

,96-511.

Sincerely, L. L. i ner

; Elf r Adensam, Chief ensing Branch No. 4 k Division of Licensing i

Enclosure:

L 4

. As stated cc: See next page DL:LB #4[ 3 1,A;QLhl8 #4 L:LB #4 K)abbour/hmc $Dddcan Adensam 6/ 3 /85 g/ji/85 / 3/85

$5000413 PDR x ..

CATAWBA Mr. H. B. Tucker, Vice President Nuclear Production Department Duke Power Company 422 South Church Street Charlotte, North Carolina 28242 cc: William L. Porter, Esq. North Carolina Electric Membership Duke Power Company Corp.

P.O. Box 33189 3333 North Boulevard Charlotte, North Carolina 28242 P.O. Box 27306 Raleigh, North Carolina 27611 J. Michael McGarry, III, Esq.

Bishop, Liberman, Cook, Purcell Saluda River Electric Cooperative, and Reynolds Inc.

1200 Seventeenth Street, N.W. P.O. Box 929 Washington, D. C. 20036 Laurens, South Carolina 29360 North Carolina MPA-1 Senior Resident Inspector Suite 600 Route 2, Box 179N 3100 fmoketree Ct. York, South Carolina 29745 P.O. Box 29513 Raleigh, North Carolina 27626-0513 Regional Administrator U.S. Nuclear Regulatory Comission, a Mr. C. D. Markham Region II Power Systems Division 101 Marietta Street, N.W., Suite 2900 Westinghouse Electric Corp. Atlanta, Georgia 30323 P.O. Box 355 Pittsburgh, Pennsylvania 15230 Robert Guild, Esq.

P.O. Box 12097 NUS Corporation Charleston, South Carolina 29412 2536 Countryside Boulevard '

Clearwater, Florida 33515 Palmetto Alliance 2135 i Devine Street Mr. Jesse L. Riley, President Columbia, South Carolina 29205 Carolina Environmental Study Group 854 Henley Place Karen E. Long Charlotte, North Carolina 28208 Assistant Attorney General N.C. Department of Justice Richard P. Wilson, Esq. P.O. Box 629 Assistant Attorney General Raleigh, North Carolina 27602 S.C. Attorney General's Office P.O. Box 11549 Columbia, South Carolina 29211 Piedmont Municipal Power Agency 100 Memorial Drive Greer, South Carolina 29651 l

l L l

CATAWBA cc: Spence Perry, Esquire Associate General Counsel Federal Emergency Management Agency Room 840 500 C Street, S.W.

Washington, D. C. 20472 Mark S. Calvert, Esq.

Bishop, Liberman, Cook, Purcell & Reynolds 1200 17th Street, N.W.

Washington, D. C. 20036 Mr. Michael Hirsch

. Federal Emergency Management Agency Office of the General Counsel Room 840 500 C Street, S.W.

Washington, DC 20472 Brian P. Cassidy, Regional Counsel Federal Emergency Management Agency, Region I J. W. McCormach P0CH Boston, Massachusetts 02109

ENCLOSURE CATAWBA NUCLEAR STATION, UNITS 1 AND 2 REQUEST FOR ADDITIONAL INFORMATION GL 83-28, ITEMS 4.1, 4.2.1 AND 4.2.2 INTRODUCTION Duke Power Company, the applicant for Catawba Nuclear Station Units 1 and 2, submitted their response to Generic Letter 83-28 on November 4, 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 4.2.1 and 4.2.2.

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

I.1 Criteria for Evaluating Compliance with Item 4.2.1

, The Catawba Nuclear Station Units I and 2 Reactor Trip Systems utilize Westinghouse DS-416 circuit breakers.

The primary criteria for an acceptable maintenance program for the 0S-416 Reactor Trip Breaker (RTB) are contained in Westinghouse Maintenance Manual for the D5-416 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.

I

I.2 Issues Relating to Item 4.2.1 The applicant response states that the preventive maintenance is performed on the Catawba Reactor Trip Breakers in accordance with the current manufacturer's recommendations as described in the technical manual.

This maintenance is currently performed once per 6 months. This frequency is under review and changes may be proposed later. The maintenance procedure is not included as a part of the submittal.

The Catawba Nuclear Station Units 1 and 2 periodic maintenance program for the reactor trip breakers should include, on a six-month basis (or when 500 breaker operation have been counted, whichever comes first):

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 under voltage 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 Manual, including replacement of UVTA if dropout voltage is greater than 60% or less than 32% 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. -

2

The Catawba Nuclear Station Units 1 and 2 Periodic Maintenance Program for the reactor trip breakers should include, on a refueling interval basis (or when 500 breaker operation 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;

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.

I Functional test of the breaker prior to returning to service as specified by the Westinghouse Paintenance Manual.

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

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

I l II. Item 4.2.2 - Trending of Reactor Trip Breaker Parameters to Forecast Degradation of Operability.

i 3

~

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

II.2 Issues Relating to Item 4.2.2 The applicant states that trending of parameters is not ,

currently recommended by the manufacturer. The cyclic life testing program (described -in the applicant's response) "will provide information to determine the need for trending of parameters."

At the present time the NRC requires recording the four identified parameters to forecast 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 trend analysis, how often the analysis will be performed and how the information derived from the analysis will be used to affect periodic maintenance. ,

i

{

37214 4

_. - . _ - _ _ _ __ _. _ . _ . . - _ . . _ ._ _ . _ _ _ _ _ _ _ _ _ - _ _ __