ML20083H703

Final Significant Const Deficiency Rept 89 Re GE AK50/AK30 Switchgear Breakers Camshaft Bearings Retaining Rings.Ge Provided Modified Procedure.Nonconformance Rept W3-6766 Initiated to Track Deficiency

ML20083H703
Person / Time
Site:	Waterford
Issue date:	01/03/1984
From:	Gerrets T LOUISIANA POWER & LIGHT CO.
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
89, Q-3-A35.07.89, W3K84-0003, W3K84-3, NUDOCS 8401130316
Download: ML20083H703 (3)

Text

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LOUISIANA 24a ouAnoNot sincer POWER & LIGHT e o Box 6000

• NEW OnLEANS. LOU:SIANA 70174 . (504] 366 2345 NuSYsESS$

January 3, 1984 W3K84-0003

, Q-3-A35.07.89

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Mr. John T. Collins i Regional Administrator. Region IP U. S. Nuclear Regulatory Commission V{k '! g _. g (98l.

I 611 Ryan Plaza Drive, Suite 1000 fjlg\,\

Arlington, Texas 76012

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REFERENCE:

LP&L letter W3K83-1510 dated de'tober 7, 1983

SUBJECT:

Waterford SES Unit No. 3 Docket No. 50-332 Significant Construction Deficiency No. 89 "G.E. AK50/AK30 Switchgear Breakers Camshaf t Bearing Retaining Ring." "

Final Report ,

In accordance with the' requirement of 10CFR50.55(e), we are hereby providing two copies of the Final Report of SJRufficcat Construction Deficiency No. 89, "G.E. AK50/AK30 Switchgear Breakers Carshaft Bearings Retaining Pings". -

If you have any questions, please adv,ise.

Very truly yours, '

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V T. F. Gerrets D

Quality Assurance Manager

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TFG:CNH:VBR cc: Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555 (15 copies) ,

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g'.c INTERIM REPORT OF SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 89 "G.E. AK50/AK30 SWITCHGEAR BREAKERS CAMSHAFT BEARING RETAINING RING" INTRODUCTION This report is submitted pursuant to 100FR50.55(e). It describes a deficiency that existed in the 480 volt switchgear breakers supplied by General Electric.

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 routine operation of a safety-related 480 volt switchgear breaker it failed to close when required. The problem was traced to bearings on the closing spring camshaf t which slid out of the breaker housing and caused shaft misalignment. The misaligned shaft placed the closing spring in a position which prevented it from pulling the breaker closed. Subsequent inspection revealed other breakers with the same deficiency.

SAFETY IMPLICATIONS ,

If left uncorrected, failure of the 480 volt breakers to close could prevent operation of safety related equipment required for safe shutdown of the plant.

CORRECTIVE ACTION Nonconformance Report No. W3-6766 was initiated to track and document this deficiency.

Gereral Electric has provided a modification procedure and parts for permanent corrective action. This consisted of a steel collar-type plate bolted to the breaker housing which keeps the bearing from moving out. This corrective action has been performed on all breakers. NCR-W3-6766 has been closed and verified.

This report is submitted as the Final Report.

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