ML20083A647

Final Significant Const Deficiency Rept 66 Re Defective GE Type Akr Breakers Where C-clips May Fall Off.Ge Supplied Predrilled Closure Pins W/Cotter Pin Retainers as Replacements for C-clips

ML20083A647
Person / Time
Site:	Waterford
Issue date:	12/07/1983
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, 66, W3K83-1902, NUDOCS 8312200357
Download: ML20083A647 (3)

Text

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4' Louisiama P OW E R & LIG H T /Waterford 3 SES/P. O. Box B/Killona, LA 70066

$1NNSY December 7, 1983 W3K83-1902 Q-3-A35.07.66 Mr. John T. Collins 1 Regional Administrator, Region IV Ul i U. S. Nuclear Regulatory Commission DEC & 2 2 611 Ryan Plaza Drive, Suite 1000 , }@

H-Arlington, Texas 76012 -

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REFERENCE:

LP&L letter W3K83-1698 dated November 2, 1983

SUBJECT:

Waterford SES Unit No. 3 Docket No. 50-382 Significant Construction Deficiency No. 66

" Defective GE Type AKR Breakers, C-Clips Fall Of f" Fina! 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. 66,

" Defective GE Type AKR Breakers, C-Clips Fall Of f".

If you have any questions, please advise. ,

Very truly yours, putt %

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)

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8312200357 831207 PDR ADOCK 05000382 S PDR

.4 Mr. John T. Collins

' December'7."1983

.03K83-1902 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

t. Monroe & Lemann 1424 Whitney Building New Orleans, Louisiana 70130 i

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r FINAL REPORT OF SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 66 DEFECTIVE GE TYPE AKR BREAKERS, C-CLIPS FALL OFF INTRODUCTION This report is submitted pursuant to 10CFR50.55(e). It describes a condition that existed relative to the operation of 480 volt switchgear breakers encountered during startup testing. A breaker failed to close thereby preventing the shield building vent fan E-17 (3A-SA) from operating as required. This 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.

DESCRIPTION During startup testing, the 480 volt switchgear breaker in 3A31S compartment 5B feeding the Shield Building Vent Fan did not close as required. Upon inspection of the breaker, it was found that a "C"-Clip, which retains a pin in the closing mechanism, had fallen off, thereby preventing the breaker from closing.

SAFETY IMPLICATIONS A check has been made on 88 circuit breakers in both safety and non-safety related systems, and four had "C"-Clips missing and five had loose clips. On these nine, the pins were still in place; however, with additional operations, if left uncorrected these pins may have fallen out and prevented breaker closure. Energization of switchgear breaker vent fans and other safety related loads fed by these breakers is required for the safe operation and shut down of the plant.

CORRECTIVE ACTION NCR W3-4835-S1 was initiated to track and document corrective action.

"C"-Clips of the type described above are used on all 480V breakers and had previously been considered an acceptable retaining means. General Electric (GE) was contacted to determine if the installation of the "C"-Clips required more specific installation instructions (e.g., do not reuse clip after removal; install with special tool, etc.). In response GE supplied predrilled slosure pins with cotter pin retainers as replacements for the subject C-Clips.

In addition to the above, all 480V safety and non-safety related switchgear assemblics have been reinspected for damaged, missing or incorrect retainers and, where needed, replacements were installed. LP&L maintenance procedures were revised to include the correct part identification for replacement installation, and to provide for periodic reinspection of pin integrity.

NCR-W3-4835-S1 has been closed and verified.

This report is submitted as the Final Report.