ML20084S669

AO 50-254/75-13:on 750508,HPCI Motor Speed Changer Declared Inoperable.Cause Unknown.Work Request 1653-75 Issued to Investigate & Repair HPCI Motor Speed Changer

ML20084S669
Person / Time
Site:	Quad Cities
Issue date:	05/13/1975
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	Office of Nuclear Reactor Regulation
Shared Package
ML20084S672	List: ML20084S669 ML20084S688
References
AO-50-254-75-13, NJK-75-275, NUDOCS 8306170158
Download: ML20084S669 (3)

Text

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j . c . ,* *o .  % Comm: Trith Edis n

, . ) Ouad-Cd, juscar Power Station Pest Offic680x 216 -

'7 Cordova. tihnois 61242

( / Telephone 309/664 2241 NJK-75-275 May 13, 1975

)

Director of Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555 .

Reference:

Quad-Cities Nuclear Power Station 4 Docket No. 50-254, DPR-29 Appendix A, Sections 3 5.E.1, 3 5.E.2, 3 5.E.3, 6.6.B. I .a Enclosed please find Abnormal Occurrence Report No. A0 50-254/75-13 for Quad-Ci ties Nuclear Power Station. Thi.s occurrence was previously reported to Region 111, Directorate of Regulatory Operations by telephone on May 8,

-1975 and to you and Region' 111, Directorate of Regulatory Operations by telecopy on May 8, 1975 This report is submitted to you in accordance with the requirements of Techni c.al Speci fication 6.6.B. I .a.

Very truly yours, COMMONWEALTH EDISON COMPANY QUAD-CITIES NUCLEAR POWER STATION

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N. 'J. Kallvianakis Station Superintendent ,

NJK/JCV/lk cc: Region t il, Directorate of Regulatory Operations .

J. S. Abel 8306170158 750513 PDR ADOCK 05000254 S PDR [g P.

O-O REPORT NUMBER: A0 50-254/75-13 REPORT DATE: May 14, 1975 OCCURRENCE DATE: May 8, 1975 FACILITY: Quad-Cities Nuclear Power Station Cordova, Illinois 61242 IDENTIFICATION OF OCCURRENCE:

Unit I HPCI system inoperable.

CONDITIONS PRIOR TO OCCURRENCE:

Unit 1 operating at 527 MWe and increasing load at 3 MWe/hr for fuel pre-conditioning. The RCIC system was out-of-service at the time.

DESCRIPTION OF OCCURRENCE:

At 5:20 a.m. on May 8,1975', during an RCIC outage survelliance test of the HPCI system, in accordance with Technical Specification 3 5.E.2, it was found that the HPCI motor speed changer would not operate. The requirements of Technical Specifications 3.5.E.1 and 3 5.E.2 could no longer be met and an order.ly shutdown of Unit I was initiated at the rate of 12 MWe/hr.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

Equipment Fai lure : The apparent cause of this occurrence is attributed to equipment failure. An investigation by the electrical maintenance de-partment yielded no obvious reason for this failure.

ANALYSIS OF OCCURRENCE:

The safety implications of this occurrence are minimized because the auto-matic blowdown system was operable and capable of reducing reactor pressure

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i so that the core spray and RHR systems could perform. There were no effects on the health and safety of the public related to this occurrence.

CORRECTIVE ACTION:

" The immediate corrective action in response to this occurrence was to in-itiate an orderly shutdown of Unit I reactor in accordance with Technical

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o A0 50-254/75-13 ,

May 14, 1975 Specification 3 5.E.3 A work request, number 1653-75, was issued to invest-Igate and repair the HPCI motor speed changer. During the investigation the motor speed changer motor was removed from its mounting, and while

still electrically connected, was found to operate. The motor speed chacger gear mechanism was manually operated and found to move freely. The motor was replaced in its mounting and was repeatedly operated without any re-occurrence of the previous problem. It was retested on May 14, 1975 and no problems were found.

. FAILURE DATA:

Occurrence A0 50-254/74-22, HPCI system inoperable due to motor speed changer -

failure, is the only other failure of the motor speed changer. The failure (motor burnup) resulted in changing the source of the 125 V DC power supply to the HPCI motor speed changers.

Motor name plate data:

MANUFACTURER: General Electric MODEL NUMBER: 5BC26AC389/ totally enclosed 0.10 HP 6 5160 RPM, 125 V DC, 0.91 AMP FULL LOAD and 18.9 AMP LOCKED ROTOR SHUNT WOUND e

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