ML20070F800
| ML20070F800 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 12/06/1982 |
| From: | Root R WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Sternberg D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, GO1-82-0792, GO1-82-792, NUDOCS 8212210251 | |
| Download: ML20070F800 (2) | |
Text
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Dockat nn. 50.460/513 f
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- 50. 55,(e) R:: port g
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r Washington Public Power Supply System P.O. Box 968 3000 GeorgeWashingtonWay Richland, Washington 99352 (509)372 5000 December 6, 1982
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Responds to: -
G01-82-0792 Response required by: NA j Nuclear Regulatory Condiission Region V M
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C 1450 Maria Land, Suite 210
g' Walnut Creek, California 94596
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Attention:
Mr. D. M. Sternberg
,1 2o Chief, Reactor, Construction
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b Projects Dr anch No.1 y
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Subject:
NUCLEAR PROJECTS 1 AND 4 o>
DOCKET NOS. 50-460 AND 50-513
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POTENTIALLY REPORTABLE CONDITION 10CFR50.55(e)
GENERAL ELECTRIC CIRCUIT BREAKERS AKR-30 AND AKR-50
Reference:
Telecon CR Edwards, Sup' ply System to 3
A. D'Angelo dated Nov. 15, 1982 In th above reference the Supply System informed your office of a Potentially Reportable Condition.under the provisions of 10CFR50.55(e).
Attachment A to this letter, includes a statement of the identified con-dition and a brief description of our planned corrective a: tion.
It has been concluded by the Project that the subject condition is reportable under the provision of 10CFR50.55(e) in that the circuit breakers are being utilized in Class lE safety related applications.
It is anticipated that the corrective action will be fully implemented and verified by the end of April 1983.
If circumstances change during the interim, we will promptly inform your office of the change (s).
If you have any questions or desire further information, please advise.
R. W. Root g
Acting Progra Director - WNP-1 1
RWR:CRE:pm Attachment cc: JP Laspa - Bechtel Power Corporation V Mani - United Engineers & Constructors, Inc.
JD Bateman - United Engineers & Constructors, Inc.
A Toth, NRC - WNP-2 V Stello, Director of Inspection, NRC E2m 8212210251 821206 I
PDRADOCK05000g S
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ATTACHMENT A WNP-1/4 DOCKET NOS:
50-460 and 50-513 REPORTABLE CONDITION 10CFR50.55(e)
GENERAL ELECTRIC CIRCUIT BREAKERS TYPES AKR30 AND AKR50, SERVICE ADVICE NO *?c-9.11 A
BACKGROUND in its letter of September.3,1982, the General Electric Company informed the Supply System that other potential problems exist in their electrically operated low voltage circuit breaker types AKR30 and AKR50. This report provides the corrective action being taken to rectify the identified problems and appraises the NRC of the current status.
DESCRIPTION OF DEFICIENCY The General Electric Company (GE) Service Advict No. 175-9.11 indicates Oat GE electrically operated low voltage circuit breaker types AKR30 and AKR50 manufac-tured before May 1980 may contain a defective switch and an improperly heat treated part which, under certain conditions, could result in failure of the cir-cuit breaker to close upon command. The defective switch is part of the breaker rack-out circuitry which has no safety function. The other part is a spring which is part of the breaker latching assembly.
GE is not aware of any such failures but advises that both parts should be replaced.
SAFETY IMPLICATIONS The potential failure of the improperly heat treated spring identified in GE Ser-vice Advice 175-9.11 could result in failure of the circuit breaker to latch closed on command. This could result in safety related equipment not starting, when required, for lack of power. As we have experienced no breaker failures due to this ccncern, the actual safety implications of this condition on our plant are indeterminate.
CORRECTIVE ACTION PLANNED The architect-engineer for WNP-1/4, United Engineers & Constructors, Inc. performed a review of all low voltage breakers being used in the WNP-1/4 plant and determined that seventy-five (75) GE type AKR30 and AKR50 breakers are being used for Class 1E applications. These are the same units previously reported in our letter of April 2, 1982 (G01-82-0120) which are now being repaired in the local GE facility. Arrange-ments have been made for GE to also correct the breakers for this reported condition.
The defective safety -related spring and the non-safety-related switch will both be replaced and the corrective action conipleted by the end of April 1983.
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