ML20088A894

Final Rept of Significant Const Deficiency 95 Re Failure of HPSI Pumps to Start on Actuation Signal.Initially Reported on 840224.GE Reshimmed Spring Release Interlock Shaft Bearings to Allow Binding

ML20088A894
Person / Time
Site:	Waterford
Issue date:	03/30/1984
From:	Gerrets T LOUISIANA POWER & LIGHT CO.
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
95, W3K84-0775, W3K84-775, NUDOCS 8404130290
Download: ML20088A894 (3)

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LOUISIANA 342 onAnoNoe s1neer POWER & L1GHT P O. BOX 6008

• NEW ORLEANS. LOUISIANA 70174 * [504) 366-2345 Eui$8YS March 30, 1984 W3K84-0775 Q-3-A35.07.95 1 2@

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[W,l Mr. John T. Collins Regional Administrator, Region Iv APR - 91984 p

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U. S. Nuclear Regulatory Commission j

611 Ryan Plaza Drive, Suite 1000

__ th M Arlington, Texas 76012 l

REFERENCE:

LP&L letter W3K84-0397 dated February 24, 1984

SUBJECT:

Waterford SES Unit No. 3 Docket No. 50-382 Significant Construction Deficiency No. 95 "HPSI Pumps Failed to Start on SIAS" Final Report In accordance and with the requirement of 10CFR50.55(e), we are hereby providing two copies of the Final Report of Significant Construction Deficiency No. 95, "HPSI Pumps Failed to Start on SIAS".

If you have any questions, please advise.

Very truly yours, M

T. F. Gerrets Corporate Quality Assurance Manager TFG:CNH:VBR Attachment cc: Director Office of Inspection & Enforcement-U. S. Nuclear Regulatory Commission Washington, D.C.

20555 (15 copies) 840413029 J = - a=0 840330o=~omi 1 37,

e Mr. John'T. Collins I

March 30,'1984 W3K84-0775 Page 2 cc: Director Office of Management Information and Program Control U.'S. Nuclear Regulatory Commission Washington, D.C.

20555 Mr. E. L. Bleke Shaw, Pittman, Potts & Trowbridge 1800 M Streut, N.W.

Washington, D.C.

20036 Mr. W. M. Stevenson Monroe & Lemann 1424 Whitney Building New Orleans, Louisiana 70130 Records Center Institute of Nuclear Power: Operations 1100 Circle 75 Parkway, Suite 1500

~ Atlanta, Georgia 30339 Mr. W. A. Cross 7910 Woodmont Avenue Suite 1200 Bethasda, Maryland 20814 g-w

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FINAL REPORT OF SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 95 i

"HPSI PUMPS A/AB FAILED TO START ON SIAS" INTRODUCTION

. This report is submitted pursuant to 10CFR50.55(e).

It describes'a deficiency that existed in the 4.16 KV circuit breakers manufactured by General Electric and utilized in safety.related systems at Waterford SES Unit No. 3.

This problem is considered reportable under the requirements of 10CFR50.55(e).

4 To the best of our knowledge, this problem has not been identified to the Nuclear Regulatory Commission purauant to 10CFR21.

DESCRIPTION OF PROBLEM During preoperational testing, the 4.16 KV, 350 MVA Magna Blast breakers feeding the High Pressure Safety Injection Pumps A and AB failed to closed on command. This problem has been. attributed to the failure of the trip latch cranks to return to the neutral position which caused the breakers to remain in the tripped condition. The trip latches were found to be binding due to an

- improperly aligned spring release interlock shaft.

SAFETY ~ IMPLICATIONS If left uncorrected, failure of the 4.16 KV breakers to close could prevent operation of safety related equipment required for safe shutdown and accident mitigation.

CORRECTIVE ACTION General Electric was contacted to evaluate this design deficiency and has

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. determined it is applicable to all 4.16 KV breakers.; General Electric's recommendation is= to shim 'the spring release interlock shaf t bearings to

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eliminate binding. This work has been performed and completed using vendor.

. supplied shims.- General Electric' inspected the repairs and witnessed operation of the:HPSI breakers.. The 'other 4.16 KV General Electric breakers have been inspected and reshimmed as necessary.

4 This Report is submitted as the Final Report.-

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