ML20084D191

AO 50-237/75-37:on 750604,diesel Generator Failed to Start on First Attempt.Cause Undetermined.Suitable Action Will Be Taken When Cause Determined

ML20084D191
Person / Time
Site:	Dresden
Issue date:	06/13/1975
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
370-75, 6538, AO-50-237-75-37, NUDOCS 8304080490
Download: ML20084D191 (3)

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BBS Ltr. #370-75 Dresden Nuclear Power Station l R. R. #1 '

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June 13,1975

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Mr. James G. Keppler, Regional Director j(jjjly I',f[3 ~

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SUBJECT:

REPORT OF AF'!OPl4AL OCCURRE!OE PER SECTIO'I 6.6. A 0F THE TIL f, SFFCIFICATIQ:S_

FAILU;ii'. OF THE UNIT-2 DIESEL GE'!ERATOR TO START

References:

1) Regulatory Guide 1.16 Rev. 1 Appendix A

2) Notificatica of Region III of U. S. Nuclear Regulatory Co=ission Telephone: P. Johnson,1645 hours0.019 days <br />0.457 hours <br />0.00272 weeks <br />6.259225e-4 months <br /> on June 5,1975 Telegram: J. Keppler,1055 hours0.0122 days <br />0.293 hours <br />0.00174 weeks <br />4.014275e-4 months <br /> on . Tune 5,1975

3) Drawing Number M173

4) Letters from B. B. Stcphenson to J. Keppler, report numbers 50-237/1975-16 and 50-237/1975-26 Report Nu=ber: 50-237/1975-37 Report Da'e: t June 13,1975 Occurrence Date: June 4, 1975 Facility: Drecden Nuclear Pouer Station,l'. orris, Illinois IDE.TIFICATIO:! 0F C001P.RP 0E The Unit-2 dicsc1 generator failed to start following a mont'ly h inspection.

CO!DITIC:!S PRICR TO OCCL?ar:0E Unit-2 was in the run mode at 165o Iut and 525 Wo.

DESCRIITIC'! OP OCCL?ROCOE At approxicately 1830 hours0.0212 days <br />0.508 hours <br />0.00303 weeks <br />6.96315e-4 months <br /> on June 4, 1975 the Unit-2 dican1 generator failed to start on the first attempt.

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Mr. Jam a G. K ppler Juna 13, 1975 O O -

DESIG?!ATION OF APPARE.7 CAUSE OP OCCURRD:CE Thi ; 'ct cause for the starting failure of the Unit- 2 diesel generator cannot be determined at this time.

ANALYSIS OF OCCURRD*CE The Unit 2/3 diesel generator was available as a backup and could have provided the necessary e=crgency power for a safe chutdown if required. The health and safety of the public were not jeopardized by this occurrence.

CORRETIVE ACTION .

Ic:nediately followin6. the initial failure, several additional starts were performed.

The diesel failed to start one additional time. The next day the diesel was started six times in an attempt to duplicate the. failure; however, it started successfully each time. Q1 June 10, 1975 another test was conducted and the dicsel again started six times out of six attc= pts. At.approximately 0100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> on June 11, 1975 the Unit-2 diesel failed to start twice in four attempts. A factory representative was called that morning to observe the start-ups. All six starts were successful.

Close surveillance of the diesel will be continued until the problcn can be pinpointed. 'w* hen the cause has been determined, suitable action will be taken and a follow-up letter will be submitted.

FAILURE DATA The Unit-2 diesel generator has had a series of recent starting failures of a similar nature. Previous failures occurred on April 15,1975 (Report No. 50-237/

1975-26) and en March 17, 1975 (R port No. 50-237/1975-16).

The diesel generator was manufactured by Electro-!~otive Division, General Motors Corporation. It is rated at 2500 k'.7, 4160 V and 900 RFM.

Sincerely, FP - z ~ ?i,sy.

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