ML20029A105
| ML20029A105 | |
| Person / Time | |
|---|---|
| Issue date: | 05/15/1989 |
| From: | Baker E, Naidu K Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20029A104 | List: |
| References | |
| REF-QA-99901024 99901024-89-01, 99901024-89-1, NUDOCS 9102040083 | |
| Download: ML20029A105 (6) | |
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ORGANIZATION: GENERAL ELECTRIC APPARATUS SERVICE SHOP CHAMBLEE, GEORGIA REPORT INSPECTION INSPECTION NO.: 99901024/89-01 DATE: April 21, 1989 ON-SITE HOURS: 6 CORRESPONDENCE ADDRESS: General Electric Apparatus Service Shop S134 Petch Tree Road Chamblec, Georgia 30341 ORGANIZATIONAL CONTACT: Mr. J. Rider TFLEPHONE NUMBER:
(404) 452-4800 NUCLEAR INDUSTRY ACTIVITY: Maintenance on electrical switchgear.
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ASSIGNED INSPECT 0P,:
K. R. Naidu, Reactive Inspection Section No. 1 Uaf D (RISNo.1)
OTHER INSPECTOR (5):
T. J. O'Connor, Inspector, Region 111 J. H. Neisler, Inspector, Region 111 K,fierriweather, inspector, Region 11
. B. Ruf,f Inspector, Region II g
APPROVED BY:
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jf.J. T. Baker, Chief, RIS No.1, Vendor Inspection Branch
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INSPECTICH BASES AND SCOPE:
A.
BASES:
10 CFR Part 21; 10 CFR Part 50, Appendix D.
B.
SCOPE: Witness the disassembly of three THEf 136050 molded case circuit breakers purchased by Northern States Power Corporation for use in Prairie
-Island nuclear power station;-and review the results of-electrical tests performed on eight THEF 136050 molded case circuit breakers.
PLANT SITE APPLICABILITY: Prairie Island Units 1 and 2, 50-282 and 306.
l 9102040003 910130 PDR GA999 ENVCENE 99901024 PDR
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s ORGANIZA110N: GENERAL ELECTRIC APPARATUS SERVICE SHOP CHAMBLEE, GEORGIA 4
REPORT INSPECTION NO.: 99901024/89-01 RESULTS:
PAGE 2 of 5 A.
VIOLATIONS:
No violations were identified during this inspection.
B.
NONCONFORMANCES:
No nonconfornances were identified during this inspection.
C.
UNRESOLVED ITEMS:
No unresolved items were identified during this inspection.
O, INSPECTION FINDINGS AhD OTHER COMMENTS:
1.
Background Information This inspection was conducted to witness the disassembly of selected 480 volt, THEF 136050 molded case circuit breakers (CB) manufactured by the General Electric Company (GE). These CBs had been procured i
by Prairie Island nuclear power plant (PI).
During_an NRC inspec-tion at PI conducted during October-24 through November 4,1988, NRC inspectors identified that PI had purchased 16 THEF 136050 CBs from Lakeland Engineering Equipment Company (LEEC located in Minneapolis.
It was subsequently determined that LEEC obtained the circuit breakers from B. Ferguson Industrial Control Supply, incor-porated (FISC) located in Whittier, California. The results of the Pl inspection are documented in NRC Inspection Report 50-282/88-201; 50-306/88-201.
FISC, who is not an original manufacturer of-the CBs, supplied the CBs marked "used." The status of the CBs is as follows:
One of the 16 CBs failed a preliminary electrical test during a.
receipt inspection testing conducted by the licensee and the CD was discarded, Ei ht of the CBs were installed after being dedicated by b.
0 the licensee and are reported-to be in service.
c.
The remaining 7 CBs, which were being stored-as spares, were delivered to General Electric's Apparatus Service Shop (GEASS) in Chamblee, Georgia, for tests and examination,
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1 ORGAH12AT10N: GENERAL ELECTRIC APPARATUS SERVICE SHOP 4
CHAMBLEE, GEORGIA INSPECTION REPORT PAGE 3 of 5 11 0. : 99901024/B9-01 RESULTS:
P1 arranged to conduct selected electrical tests at GEASS on the P1 CBs, including the disassembly of at least three of them.
included with this batch of seven CDs to be tested, an eighth CB which had been supplied to P1 and installed as part of the The licensee representative stated that the original equipment.CB had been in operation since early 1970 and was expressly remo from service for the purpose of these tests.
2.
Details of Tests Performed The tests performed included external inspection of the seven shipping containers in which the CBs arrived at PI from FISC, external visual inspection of the CBs, selected electrical tests, and disassembly of three CDs and inspection of their The details of these activities are described below; internals.
External inspection of the shipping contan."
a.
This visual inspection included verifying attributes, such as, condition of the shipping container and the authenticity of the various labels. The inspection determined that several GE shipping labels were counterfeit and appeared to have been made by spraying red paint over a stencil made from an original GE shipping label, b.
External inspection of the CBs The visual external inspection of the CBS included attributes such as missing or altered labels, damaged surf aces or cracks, The inspection and inconsistencies in the terminal hardware.
identified that five of the eight CBs were af fixed with GE labels xeroxed using original GE labels.
Similarly, the Under-writers Laboratories (UL) labels on seven of the eight CBs were observed to be xerox copies of original UL labels. There was no visible indication that any of the CBs were opened.
c.
Electrical tests The electr m l tests, which were conducted on the CBs on April 20, 1989, included measurement of contact resistance The contact and trip time at 200 percent of rated current.
resistances on CB identified as number seven were determined to be higher than the rest of the CBs.
As a result of this observation, the heat rise at each set of contacts was measured on this CB after thermal stabilization.
The heat rise on the I
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ORGANIZATION: GENERAL ELECTRIC APPARATUS SERVICE SHOP CHAMBLEE, GEORGIA
' REPORT INSPECTION NO.: 99901024/89-01 RESULTS:
PAGE 4 of 5 center phase was measured to be 25-degrees centiC' de.
The acceptable heat rise is 50-degrees centigrade accorsing to GE.
To test the insulation resistance, a Hipot test voltage of 2500 volts ac was applied for one minute between the line and load terminals of each phase of the CB, with the CB open.
The same voltage was applied between the phases and between one phase and the CB case, for each CB, for one minute with the CB closed. The results on six of the eight CBs tested were normal and met the manufacturer's specifications. The trip time at 200 percent of rated current on phase A of the CB identified as number five was 256.86 seconds instead of 100-250 seconds.
It was decided to disassemble the CBs identified as number five and nunter seven and com)are the internals with the CB identified as number three, w1ich is the CB known to have been supplied with the original plant equipment.. The inspec-tors observed that instruments with current calibration stickers were used to test the CBs.
d.
Visual inspection of the internal parts
'ina NRC inspectors observed the disassently of the three CBs identified above. A special tool was used to remove the rivets which held the two halves of the CB together.
Visual inspec-tion of the internal parts of the CBs, such as, the moving contacts, stationary contacts, arc chutes, handle, and operating mechanist.1, indicated that they were genuine parts and that the internal mechanism had not been tampered with.
Information on the inside cover of CB number three indicated that the mold date was 1965 and the CB was assembled in 1969. The contacts in this CB exhibited some oxidation iiidicating that it had interrupted current during its life
~ time. The inside case cover of CB number five indicated that it was molded in 1966 and had no manufacturing date code.
The internals of this CB were observed to be very clean.
It was concluded that either the CB was preserved well over the years during storage, or the CB was subjected to degreasing operations. The contacts of CB. number seven exhibited oxidation indicating that it interrupted current at.least-once during its life time, substantiating that it was a used breaker. The mold date on the CB cover was 1956 and the manufacturing date was 1965.
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ORGANIZATION: GENERAL ELECTRIC APPARATUS SERVICE SHOP CHAMBLEE, GEORG1A REPORT INSPECTION NO.: 99901024/89-01 RESULTS:
PAGE 5 of 5 f.
PERSONS CONTACTED:
Prairie Island Nuclear Power Plant K. Beadell, Superintendent, Technical Engineering General Electric Company P. M. Briggs, Manager Quality Assurance, Nuclear Plant Services Department, Norcross, Georgia W. J. Heerline, Manager Production & Quality Engineering, Plainville, Connecticut N. Luria Materials Services Engineer, San Jose, California R. Rider Quality Control, GEASS Chamblee, Georgia
kERVICESHOPRPT.
4 E PPARA U Requestor's ID:
HOWARD Author's Name:
Kamal Naidu Document Coments:
Docket No. 99901024/89-01 l