ML20082E590
| ML20082E590 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 11/16/1983 |
| 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, 86, W3K83-1783, NUDOCS 8311280245 | |
| Download: ML20082E590 (3) | |
Text
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W LOUISIANA POW ER & LIG HT /Waterford 3 SES/P. O. Box B/Killona, LA 70066
$1UkNSYS November 16, 1983 W3K83-1783 Q-3-A35.07.86 f
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Mr. John T. Collins f
Regional Administrator, Region IV J4
[igf 7 l U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 UU.
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f Arlington, Texas 76012
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REFERENCE:
LP&L letter W3K83-1590 dated October 19, 1983
Dear Mr. Collins:
SUBJECT:
Waterford SES Unit No. 3 Docket No. 50-382 Significant Construction Deficiency No. 86 "3A-S Safety Inverter Output Capacitor Wiring Burned" Final Report In accordance with the requirements of 10CFR50.55(e), we are hereby providing two copies of the Final Report of Significant Construction Deficiency No. 86, "3A-S Safety Inverter Output Capacitor Wiring Burned."
If you have any questions, please advise.
Very truly yours, M
T. F. Gerrets Quality Assurance Manager TFG:CNH:SSTG l
Enclosures l
i cc: Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D.C.
20555 (15 copies) 8311280245 831116
{DRADOCK 05000382 l
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- Mr. John T. Collins November 16, 1983 W3K83-1783 -
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 Menroe & Lemann 1424 Whitney Building New Orleans, Louisiana 70130
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'i FINAL REPORT OF SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 86 "3A-S SAFEIY INVERTER OUTPUT CAPACITOR WIRING BURNED" INTRODUCTION This report is submitted pursuant to 10CFR50.55(e).
It describes a deficiency
-that existed in the output capacitor wiring of the 10 KVA inverters supplied by the Elgar Corporation. The problem is considered reportable under the requirements of 10CFR50.55(e). To the best of our knowledge, this problem has not been' identified to the Nuclear Regulatory Commission pursuant to 10CFR21.
sDESCRIPTION OF PROBLEM During periodic inspection by LP&L start-up personnel it was discovered that the output capacitor wiring of the 3A-S inverter (supplied by Elgar) was burned. This problem was traced to the use of push-on connectors at the capacitors resulting in a high resistance connection and subsequent heating.
~The 3B-S~ inverter was subsequently inspected and the same problem was identified.
The 3A-S and 3B-S inverters supplied by Elgar are part of the 120 volt uninterruptable AC system described.by FSAR section 8.3.
They supply power to safety related loads including solenoid valve operators, radiation monitors and auxiliary isolation relay panels. The four Plant Protection System inverters are manufactured by a different vendor and not involved in this deficiency.
SAFETY IMPLICATION
~If left uncorrected, loss of the 3A-S or 3B-S inverter would lead to loss of its respective safety related loads until an operator was able to perform a local manual transfer to the bypass supply (480V Motor Control Center 3A-313-S or 3B-313-S).
This deficiency would, therefore, have resulted in delay or inoperability of safety related functions in an accident situation.
CORRECTIVE ACTION The vendor determined that the resolution was to solder the output leads directly to the capacitors, thereby eliminating the high resistance push-on connectors. Nonconformance Report W3-6510 was generated to document and track corrective action. Corrective action was performed in accordance with the vendor's recommendation.
This report is submitted as the Final Report.
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