ML17251A683
| ML17251A683 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 05/14/1986 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML17251A682 | List: |
| References | |
| GL-83-28, NUDOCS 8605210549 | |
| Download: ML17251A683 (7) | |
Text
Enclosure SAFETY EVALUATION REPORT R.
E.
GINNA POWER PLANT REACTOR TRIP SYSTEM RELIABILITY ITEMS 4.2.1 ANO 4.2.2 OF GENERIC LETTER 83-28 l.
INTRODUCTION On July 8, l983, 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 ma1ntenance and surve1llance test1ng is implemented for the reactor trip breakers (RTBs) in pressurized water reactors.
In part1cular, Item 4.2 of the letter requ1red the licensees and applicants to submit a description of their prevent1ve maintenance and surveillance program to ensure reliable reactor trip breaker operation..
The description of the subm1tted program was to include the following:
GL, Item 4.2.1 A planned program of periodic maintenance, including lubr1cation, 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.
Rochester Gas and Electric Corporation, the licensee for Ginna, submitted responses to the Gener1c Letter on November 4, l983, February 28,
- 1985, and April 7, l986.
This report presents an evaluation of the adequacy of those responses and of the licensee's preventive maintenance and surveillance programs for RTBs.
8605210549 860514 PDR'DOCK 05000244 I
i PDR
2.
EVALUATION CRITERIA 2.l Periodic Haintenance Pro ram The primary source for periodic ma1ntenance program criteria is Westin house Maintenance Pro ram for DB-50 Reactor Tri Switch ear, Rev.
0.
This document is the breaker manufacturer's recommended maintenance program for the DB-50 breaker and provides specific direction w1th regard to schedule, 1nspection and testing, cleaning, lubrication, corrective maintenance and record keep1ng.
The document was reviewed to identify those 1tems that contribute to breaker tr1p reliab111ty cons1stent with the generic letter.
Those items identified for maintenance at six month intervals that should be included in the licensee's RTB maintenance program are:
l.
Verification of trip bar freedom 2.
Verification of operating mechan1sm al1gnment and freedom 3.
Retaining ring verification 4.
Verification of nut and bolt tightness 5.
Verification of pole bases physical condition 6.
Verification of arc1ng and main contacts physical cond1tion 7.
Verification of insulating link's physical condition 8.
Verification of wiring 1nsulation and termination physical condition 9.
Verification of arc chute physical condition 10.
Verification of breaker cleanliness ll.
Undervoltage Trip Attachment (UVTA) dropout voltage test and lubrication l2.
Shunt Trip Attachment (STA) operat1on verification 13.
Verification of operation of auxiliary switches 14.
Inspection of positioning lever condition 15.
Functional test of the breaker prior to returning it to serv1ce.
The licensee's RTB per1odic maintenance should also include, on a
r'efueling interval basis:
16.
Veri f 1 ca t1on of cel 1 inter lock opera t 1 on 17.
Examinat1on and cleaning of breaker enclosure l8.
Heasurement of trip force required 19.
Functional test of the breaker prior to returning it to service 20.
Breaker response time for undervoltage tr1p.
All of the items listed above are recommended by the manufacturer except Item 20.
This item is the breaker trip response time measurement which is implied by the IEEE Standard 279-1971.
'.2 Trendin of Parameters Generic Letter Item 4.2.2 spec1fies that the licensee's preventative maintenance and surveillance program is to include trending of parameters affecting operat1on and measured during testing to forecast degradation of operation.
The parameters measured during the maintenance program described above which are appl1cable for trending are undervoltage trip attachment dropout voltage, trip force, and breaker response time for undervoltage trip.
The staff pos1tion 1s that the above three parameters 1n addition to the breaker 1nsulat1on res1stance are acceptable and recommended trend1ng parameters to forecast breaker operation degradation or failure. If subsequent experience ind1cates that any of these parameters is not useful as a tool to anticipate failures or degradation, the licensee may, with )ustification and NRC approval, elect to remove that parameter from those to be tracked, 3.
EVALUATION 3.l Evaluation of the Licensee Position on Item 4.2.1 The licensee states that his preventative maintenance program for RTB's has been revised and w1ll have been approved and 1mplemented by the completion of the scheduled l985 refuel1ng outage.
He further states that
1
his procedures will conform in intent to the referenced Westinghouse maintenance program; the licensee's most-recent response has included his revised procedures.
The staff finds that the 11censee has prov1ded a
reviewable description of his preventative maintenance
- program, which program 1ncludes the elements detailed in Section 2.l of this SER.
The licensee performs RTB preventative maintenance on a l2-month
- 1nterval, based on prior acceptable RTB ma1ntenance performance.
The staff finds that the licensee's extended maintenance 1nterval 1s acceptable.
This acceptance is based on the RTB vendor's recommendation that maintenance on RTBs located in mild environments should be performed annually.
The vendor recommendation that RTBs located in harsh env1ronments or experiencing severe load conditions be ma1ntained more frequently is not applicable to these RTBs because of their location in a mild environment and reduced service duty at Ginna (fewer than 200 RTB cycles annually).
3.2 Evaluation of the L1censee's Position on Item 4.2.2 The licensee has committed to performance of trend analysis of trip force, undervoltage trip dropout voltage and insulation resistance; the licensee performs response time testing, but does not trend breaker response time.
The licensee has identified the organization which will perform trend analysis, how often it will be performed and how the 1nformation derived from the analysis w1ll 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 responses on Items 4.2.l and 4.2.2 of Generic Letter 83-28 to be acceptable.
E Distribution Co ies:
oc et No 5 -3 5
NRC PDR Local PDR TNovak, Actg.
DD ELD EJordan BGrimes JPartlow GLear HFairtile ACRS (10)
FRosa (w/o enclosure)
JKnight (w/o enclosure)
PAD r.'1 r/f PAD>1 s/f i ~ en
<<k i -
~---