ML20083A590
| ML20083A590 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 12/06/1983 |
| From: | Gerrets T LOUISIANA POWER & LIGHT CO. |
| To: | Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 87, W3K83-1896, NUDOCS 8312200334 | |
| Download: ML20083A590 (3) | |
Text
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's Louisiama P OWE R & LlG H T/ Waterford 3 SES/P. O. Box B/Killona, LA 70066
$1UNSYS M
December 6, 1983 W3K83-1896
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DEC 6 2 W Mr. John T. Collins Regional Administrator, Region IV l
U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012
REFERENCE:
LP&L letter W3183-0307, dated September 9, 1983
Dear Mr. Collins:
SUBJECT:
Waterford SES Unit No. 3 Docket No. 50-362 Significant Construction Deficiency No. 87 "GE 480V Breaker AKR-4A-50, Wiring Error" Final Report In accordance with the requirement of 10CFR50.55(e), we are hereby providing two copics of Significant Construction Deficiency No. 87, "GE 480V Breaker AKR-4A-50, Wiring Error".
If you have any questions, please advise.
Very truly yours, Y
T. F. Gerrets Quality Assurance Manager TFG:CNH:VBR cc: Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D.C.
20555 (15 copies) fY) ' st 0312200334 831206 PDR ADOCK 05000382 S
sw Mr. John T. Collins December 6, 1983 W3K83-1896 Page 2 cc: Director Office of Management Information and Program Control U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Mr. E. L. Blake Shaw, Pittman, Potts, & Trowbridge 1800 M Street, N.W.
Washington, D.C.
20036 Mr. W. M. Stevenson Monroe & Lemann i
1424 Whitney Building New Orleans, Louisiana 70130 Records Center Institute of Nuclear Power Operations 1100 circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 t
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FINAL REPORT OF SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 87 "GE 480V BREAKERS AKR-4A-50, WIRING ERROR" INTRODUCTION This report is submittea pursuant to 10CFR50.55(e).
It describes a wiring error identified in GE 480V breakers.
To the best of our knowledge this deficiency hac not been reported to the USNRC pursuant to 10CFR21.
DESCRIPTION It has originally been determined that the GE factory wiring for 480V breakers (AKR-4A-50) located in safety and nonsafety related switchgear was not in accordance with the manufacturer's control wiring diagram.
It was thought that the jumper wire was installed by the vendor between the breaker's 52X contacts and the 52W coil causing the closing circuit to open prematurely by the early energization of the 52W antipump coil. However, failure of the breaker to close was not due to the viring discrepancy, but by a defective breaker switch.
SAFETY IMPLICATIONS The jumper cable was added by GE to improve the anti-pump characteristics of the closing circuit when closing under low closing voltage conditions. This condition does not exist due to the nature of the 125V system design and its' omission would not adversely affect the IE performance of the breaker.
CORRECTIVE ACTION TAKEN The breaker's internal wiring was originally checked by a GE Service Representative who verified that the jumper wire needed to be removed for proper breaker operation. NCR-W3-6566 was initiated to track and document the removal of the jumper wire.
Subsequent to the removal of the jumper wire, it became apparent that f aulcy operation of the breaker was due to a defective switch. Corrective action of the defective switch is being performed under the Engineering disposition of NCP-W3-7144 (SCD #91) which is scheduled for completion in January, 1984. NCR-W3-6566 (jumper removal) has been closed and verified.
This report is submitted as the Final Report.
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