ML20012B116
| ML20012B116 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 03/07/1990 |
| From: | Hairston W GEORGIA POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| HL-959, IEB-88-010, IEB-88-10, NUDOCS 9003130594 | |
| Download: ML20012B116 (5) | |
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HL-959:
000213
't March 7, 1990
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U.S. Nuclear Regulatory Commission ATTN:. Document Control Desk
' Washington, D.C. 20555 PLANT HATCH - UNITS 1, 2 t
NRC DOCKETS 50-321, 50-366 OPERATING LICENSES DPR-57, NPF-5 BULLETIN 88-10 TEST RESULTS Gentlemen:
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. Based on:recent conversations with L. P.
Crocker, NRC Project Manager for Plant-Hatch; it was-determined that it would be appropriate to forward information _related to circuit breaker (CB) testing even though only three
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CB's were tested. The requested test information related to the CB's:is enclosed'.
Should you have any questions in this regard,--please contact this office _at any. time.
I Mri :W. G. Hairston, III states-he'is. Senior Vice President-of Georgia Power -Company and is authorized to execute this oath on behalf of Georgia-Power Company. and to the best of his knowledge and belief, the facts set forth in this letter are true.
I GEORGIA POWER COMPANY-BY:
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. /Yr., Zh W W. G. Hairston, III Sworn to and subscribed before me this day of N7/Mr/ 1990.
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Enclosure:
IEB 88-10 Test Results NYCOEWiON EMlRIS 0!c.15,122 c:
(See next page.)
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U.S. Nuclear Regulatory Commission
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March-7 1990~
Page Two c:.-Georaia Power Comoany Mr. H. C. Nix, General Manager - Nuclear Plant -
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Mr. J. D. Heidt, Manager Engineering and Licensing - Hatch GO-NORMS p
U.S. Nuclear Reaulatory Commission. Washinaton. D.fi Mr. L. P. Crocker, Licensing Project Manager
. Hatch
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- U.S. Nuclear Reaulatory Commission. Reaion II Mr. S.. D. Ebneter, Regional Administrator Mr. J. E. Menning, Senior Resident Inspector - Hatch F6 i
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ENCLOSURE PLANT HATCH - UNITS 1, 2 NRC DOCKETS 50-321, 50-366 OPERATING LICENSES DPR-57, NPF-5 IEB 88-10 TEST RESULTS BACKGROUND Per Item 1 of actions requested in Bulletin 88-10, GPC determined 121 molded-case circuit breakers (MCCBs) at Plant Hatch were being maintained as stored spares for future use in safety-related applications.
Per the definition of verifiable traceability stated in the Bulletin,108 breakers were traced to the circuit breaker (CB) manufacturer by verifying the proctrement chain. The remaining 13 breakers were determined to be untraceable to the manufacturer. No installed breakers were required to be reviewed for traceability per Bulletin Item 1, since a warehouse population of 121 breakers was established. However, upon discovery of the 13 untraceable breakers in warehouse stores, a review of breakers supplied under the same purchase orders and subsequently withdrawn from the warehouse was conducted.
As a result of this review, three untraceable breakers were found to be installed in safety-related applications. These three breakers were removed from service and replaced with new breakers meeting the criteria of Bulletin Item 7.
DISCUSSION Plant E.1. Hatch policy is to replace any untraceable breakers installed in safety-related applications with new breakers rather than test the breakers asBulletin 88-10 allows. After discussing the testing issue with-NRR staff personnel, it was decided the 16 suspect breakers should-be tested only to determine whether the documentation search in Bulletin Item 4 was necessary.
The 13 breakers in the warehouse and the 3 breakers removed from the plant were shipped to a laboratory for testing.
GPC was informed by laboratory personnel that six of the breakers were damaged during shipping to the extent they could not be tested. The laboratory was directed to test the remaining 10 CBs. The first three CBs tested failed. Testing was halted at this-point, since the 10-percent failure rate was reached.
The test failure parameters for the three breakers that were tested are listed in Table 1 of this enclosure.
000213 HL-959 E-1
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., d ENCLOSURE (Continued) 1E8 88-10 TEST RESULTS TABLE 1 ($HEET 1 0F 2) j
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BREAKER TEST ID NO. 85 i
Manufacturer:
Westinghouse GPC P0 No:
E-58095 Model No:
HFB3110ML Supplier:-
Golden Isle Supply Voltage Rating:
600 VAC Sub Supplier:
HLC Electric Supply i
Trip _ Rating:-
10 amps company Test Failed: Adjustable instantaneous trip test Test carameters at which failure occurred:
Trip test amps:
35/110 Pole 1 Pole 2 Pole 3 Lowest setting (amps) 35 35 35
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Trip current (amps) 50.5 50.3 43.6 Trip time (sec) 0.025 0.031 0.031 Pole 1 Pole 2 Pole 3 Highest setting (amps) 110 110 110 Trip current (amps) 141.3 151.3 140.7 Trip time (sec) 0.080 0.037 0.044 Acceptance Criteria:
P Lowest setting 26.25 amps to 43.75 amps Highest setting 88 amps to 132 amps Failure:
'I Breaker trip current is higher than allowable.
000213 HL-959 E-2
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ENCLOSURE (Continued)
IEB 88-10 TEST RESULTS TABLE 1 (SHEET 2 0F_2) 11.. BREAKER TEST ID NO. 86 Manufacturer:
Westinghouse GPC P0 No:
B41679 Model No:
HFB3050 Supplier:
B&S Electric Voltage Rating: '600 VAC Sub Supplier: General Magnetic /
Trip Rating:
50 amps Electric Wholesale Test Failed: Time-delay overcurrent trip test Test parameters at which failure occurred:
Trip test amps: M Pole 1 Pole 2 Pole 3 Trip time at 300% (sec) 6.35 12.30 11.74 Failure:
Breaker trip times are less than minimum specified by manufacturer.
III. BREAKER TEST ID NO. 88 Manufacturer:
Westinghouse GPC P0 No:
E58095 Model No:
HFB3110ML Supplier:
Golden Isle Supply Voltage Rating: 600 VAC Sub Supplier: HLC Electric Supply Trip Rating:
'10 amps Company Test Failed:. Adjustable instantaneous trip test Test carameters at which failure occurred:
Trip test amps:
35/100 Pole 1 Pole 2 Pole 3 Lowest setting 35 35 35 Trip current (amps) 54.7 51.4 54.8 Trip time (sec) 0.029 0.049 0.051 Failure:
Testing on high setting resulted in smoke issued from breaker.
Testing was discontinued, i
000213 I
HL-959 E-3 4
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