ML16341D092
| ML16341D092 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 01/16/1985 |
| From: | Knighton G Office of Nuclear Reactor Regulation |
| To: | Shiffer J PACIFIC GAS & ELECTRIC CO. |
| References | |
| GL-83-28, NUDOCS 8502010815 | |
| Download: ML16341D092 (12) | |
Text
Docket Nos.:
50-275 and 50-323 Mr. J.
D. Shiffer, Vice President Nuclear Power Generation c/o Nuclear Power Generation, Licensing Pacific Gas and Electric Company 77 Beale Street, Room 1451 San Francisco, California 94106
Dear Mr. Shiffer:
SUBJECT:
GENERIC LETTER 83-28, ITEMS 4.2.1 AND 4.2.2 The staff has reviewed your submittals with regard to Generic Letter 83-28, Items 4.2. 1 and 4.4.2 on your preventive maintenance program for reactor trip breakers/maintenance and trending.
In its review the staff was assisted by Idaho National Engineering Laboratory (INEL).
Based on our review we find that the information provided is not sufficiently detailed to permit an evaluation of the adequacy of the periodic maintenance and trending programs for the breakers.
Therefore, the information identified in the enclosure is requested for our evaluation for compliance with Items 4.2. 1 and 4.2.2.
We request that you provide the information within 90 days of receipt of this letter.
Sincerely, original sign6d by Q66pg6 g gQj.ghCOD
Enclosure:
As stated George W. Knighton, Chief Licensing Branch No.
3 Division of Licensing cc w/enclosure See next page DISTRIBUTION:
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Mr. J.
D. Shiffer, Vice President Nuclear Power Generation c/o Nuclear Power Generation, Licensing Pacific Gas and Electric Company 77 Beale Street, Room 1451 San Francisco, California 94106 Philip A. Crane, Jr.,
Esq.
Pacific Gas
& Electric Company Post Office Box 7442 San Francisco, California 94120 Mr. Malcolm H. Furbush Vice President - General Counsel Pacific Gas
& Electric Company Post Office Box 7442 San Francisco, California 94120 Janice E. Kerr, Esq.
California Public Utilities Commission 350 McAllister Street San Francisco, California 94102 Mr. Frederick Eissler, President Scenic Shoreline Preservation Conference, Inc..
4623 More Mesa Drive Santa Barbara, California 93105 Ms. Elizabeth Apfelberg 1415 Cozadero San Luis Obispo, California 93401 Mr. Gordon A. Silver Ms. Sandra A. Silver 1760 Alisal Street San Luis Obispo, California 93401 Harry M. Willis, Esq.
Seymour
& Willis
'01 California Street, Suite 2100 San Francisco, California 94108 Mr. Richard Hubbard MHB Technical Associates Suite K
1725 Hamilton Avenue San Jose, California 95125 Mr. John Marrs, Managing Editor San Luis Obis o Count Teleqram Tribune 3
1 Jo nson venue P. 0.
Box 112 San Luis Obispo, California 93406 Diablo Canyon Resident Inspector/Diablo Canyon NPS c/o US Nuclear Regulatory Commission P. 0.
Box 369 Avila Beach, California 93424 Ms.
Raye Fleming 1920 Mattie Road Shell Beach, California 93440 Joel
- Reynolds, Esq.
John R. Phillips, Esq.
Center for Law in the Public Interest 10951 West Pico Boulevard Third Floor Los Angeles, California 90064 Mr. Dick Blankenburg Editor
& Co-Publisher South County Publishing Company P. 0.
Box 460 Arroyo Grande, California 93420 Bruce Norton, Esq.
Norton, Burke, Berry & French, P.C.
202 E. Osborn Road P. 0.
Box 10569 Phoenix, Arizona 85064 Mr. W.
C. Gangloff Westinghouse Electric Corporation P. 0.
Box 355 Pittsburgh, Pennsylvania 15230 David F. Fleischaker, Esq.
P. 0.
Box 1178 Oklahoma City, Oklahoma 73101
0 0
E Arthur C. Gehr, Esq.
Snell 5 Wilmer 3100 Valley Center Phoenix, Arizona 85073 Mr. Lee M. Gustafson, Director
'ederal Agency Relations Pacific Gas 5 Electric Company
'050 17th Street,. N.W.
Suite 1180 Washington, DC 20036 Mr. Thomas Devine Government Accountability Project
'nstitute for Policy Studies
'901 gue Street, NW Washington DC 20009 I
Regional Administrator - Region V
US Nuclear Regulatory Commission 1450 Maria Lane Suite 210 Walnut Creek, California 94596 t
Michael J. Strumwasser, Esq.
Special Counsel to the Attorney General State of California 3580 Wilshire Boulevard, Suite 800 Los Angeles, California 90010 Mr. Tom Harris Sacremanto Bee 21st and 0 Streets Sacramento, Cali fornia 95814 Mr.'. Daniel Nix California Energy Commission 1516 9th Street, MS 18 Sacramento, California 95814 Lewis Shollenberger, Esq.
US Nuclear Regulatory Commission Region V
1450 Maria Lane Suite 210 Walnut Creek, California 94596
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ENCL'OSURE DIABLO CANYON UNITS 1 and 2
REQUEST FOR ADDITIONAL INFORMATION GENERIC LETTER 83-28 1.
Item 4.2. 1 - Periodic Maintenance Program for Reactor Trip Breakers.
- 1. 1 Criteria for Evaluatin Com liance with Item 4.2. 1 The Diablo Canyon Units 1 and 2 Reactor Trip, Systems utilize Westinghouse DB-50 circuit breakers.
The primary criteria for an acceptable maintenance program for this breaker are contained in Maintenance Pro ram for DB-50 Reactor Tri
~Switch ear, Rev. 0, dated October la,
- 1983, by Westinghouse.
The NRC Staff, Equipment Qualification
- Branch, has reviewed and endorsed the Westinghouse Ma,intenance Program for DB-50 Switchgear.
Specifically, the criteria used to evaluate compliance include. those items in the Westinghouse program that relate to the safety function of the breaker, supplemented by those measures that.must be taken to accumulate data for trending.
1.2 'Issues Relatin to Item 4.2. 1 The licensee response states that a
new maintenance procedure, E-.51.7, has been implemented which "incorporates the latest Westinghouse information and will be performed on a yearly basis."
The licensee's submittal did not include a
copy of. procedure E-51.7; also, the Westinghouse recommendations for a periodic maintenance program identify six-month and refueling outage maintenance intervals, rather than annual intervals.
Does the Diablo Canyon Units 1 and 2 periodic maintenance program for the reactor trip breakers
- include, on a six month basis:
1.
Verification of trip bar freedom; 2.
Verification of operating mechanism alignment and
- freedom, using the procedure identified in the Westinghouse program; 3.
Retaining ring verification, 33 places; 4.
Verification of nut and bolt tightness 5.
Verification of pole bases physi'cal condition;
0 C
.6..
Verificatio'n of arcing and main contacts physical condition, using t:he procedure ideatified in the Westinghouse program; 7.
Verification of ins'ulating link's physical condition; I
8.
Verification of wiring insulation and termination physical condition; 1
9.
Verification of;arc chute physical condition; I
10.
Verification of breaker cleanliness; 11.
Undervoltage Trip Attachment (UVTA) dropout voltage test and lubrication, using the procedure identified in the Westinghouse program; 12.
Shunt Trip Attachment (STA) operation verification; 13.
Verification of operation of auxiliary switches; 14.
Inspection of positioning lever condition, using the procedure identified in Westinghouse program; 15.
Functional test of the breaker prior to retur'ning it to
- service, using the procedure identified in the Westinghouse program.
Does the Diablo Canyon Units 1 and 2 periodic maintenance program for the reactor trip breakers
- include, on a
refueling interval basis:
l.
Verification of cell interlock operation; I
2.
Examination and cleaning of breaker enclosure; 3.
Measurement of trip force required, using the procedure identified in the Westinghouse program; 4.
Breaker response time for undervoltage trip; 5.
Functional test of'he breaker prior to returning it to
- service, using the procedure identified in the Westinghouse program.
The licensee is to 'confirm that the periodic maintenance program includes these 20 items at the specified intervals or commit to their inclusion.
~ 4
2..
Item 4.2.2 Trending of Reactor Trip Breaker Parameters to Forecast Degradation of Operability; 2.1 Criteria for Evaluatin Com liance with Items 4.2.2 Four parameter s have been identified as trendable and are included in the criteria for evaluation.
These are (1) undervol tage trip attachment dropout voltage, (2) trip force, (3) breaker response time for undervoltage trip, and (4) breaker'nsulation resistance.
2.2 Issues Relatin to Item 4.2.2 The licensee indicates that development of a program to trend "parameters affecting operation to forecast degradation of operability" would be complete by December 1983.
The licensee is to commit to inclusion of trip force, breaker response time and dropout voltage for undervoltage trip and breaker insulati'on resistance as trending parameters.
The licensee should also identify the organization which will perform trend analysis, how often the analysis will be performed ard how the information derived from.the analysis will be used to affect periodic mai.ntenance.