ML20084U171

Telecopy Ao:On 750408,during Surveillance Test,Electric Flash Burned Out Diode Rectifier Array of Diesel Generator Excitation Circuitry.Work Request 1259-75 Issued for Repair of Damaged Electrical Gear

ML20084U171
Person / Time
Site:	Quad Cities
Issue date:	04/09/1975
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20084U167	List: ML20084U166 ML20084U171
References
NJK-75-184, NUDOCS 8306270096
Download: ML20084U171 (1)

Text

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ll.n , #W:- Commo 1th Edison Ound.CHiegt etating S11tbn Post Office Box 216 j'i ~ .' ,

Cordova. !!!inois 61242

, ,- Tele;25one3>3/654 2241

' .! NJK-75-184

.' TELECOPY:- Regfon iII, Attention:- Mr. C. FeTerabend 0: .-

j- April 9, 1975

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!- J. Keppler, Regional Director -

l Directorate of Regulatory Operations

f. Region lli -

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[ G. S. NUCLEAR REGULATORY COMMISSION

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799 Roosevelt Road.

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- Glen Ellyn, IL 60537

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REFERENCE:

quad-Cities Nuclear Power Station, Unit 2 -  :

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h- Docket No. 50-265, DPR-30

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" AppendIt A. Sections I .O.A.Z, 3 9.A..I ,

Dear Mr. Keppler:

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The purpose of this letter is tor provide you with notification of an Abnorreal' '

Occurrence as required by Technical Specification 6.6.8.1.a within. 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of, A- the occurrence..

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,jl At 3:25 p. n. on AprII 8,1975, during nonthly surveillance testing of unit 2 .

. diesel generator, an electrical flash burned out the d ido e rectifier array of

{ ~' the generator

• s excitation circuitry. The diesel generator output breaker was -

I~ inmediately- tripped and the. generator was stopped. No damage occurred other -

I than that in the 'sectif ter cabinet. A~ work. request (1259-75) was then issued

[ for repair of the damaged electrical gear. -

Although the diesel ' generator was made dinoperable, the safety frupIIcations were ,

' minimized by the fact that the unit was in the cold shutdown condition for s refueling and off-site auxiliary power was available.

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This occurrence was discussed with Mr. Felerabend of your office on April 8,

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F 1975 Further information w111 be provided by Abnormal Occurrence Report- -

y A0 50-265/75-11 which will be submitted within 10 days of the.date of this.

[I occurrence.

Very truly yours, j..

5 CO**MONVEALTH EO f SON' COMPANY

[ QUAD-CITIES NU R POWER- STATION'.

[ N.. J. Kaiivianakis

- Station Superintendent

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[ NJK.SRH/dkp cc: Directorate of. Licensing l -

i

-J. S Abel l

8306270096 750418 PDR ADOCK 05000265 /

p?.' W p 77 , .

3 S PDR A/ 75~

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