ML20085C898

AO 50-254/74-31:on 740929,during Monthly Surveillance Test, Diesel Generator 1/2 Failed to Start.Caused by Operator Error.Valves Re Air Start Motor Air Supply for Generators Chained

ML20085C898
Person / Time
Site:	Quad Cities
Issue date:	10/09/1974
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085C901	List: ML20085C898 ML20085C902
References
AO-50-254-74-31, NJK-74-324, NUDOCS 8307130193
Download: ML20085C898 (3)

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11r . John F. O ' Le ary , Director -.',7 _ _ _ .c < s -

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Washington, D. C. 20545 REFERE!!CE: Quad-Citien !!uclear Power Station Docket !!o. 50-254, DPR-29 Appendix A, Sections 1.0.A.2, 3.9.E.1, and 6.6.B.I.a

Dear Mr. O' Leary:

Enclosed pleane find Abnorr.ial Occurrence Report No. AO 50-25h/

74-31 for Quad-Cities tiuelear Po<:er Stacion. This occurrence was previously reporced to Recien III, Directorate of Regula-tory Operations by telepnone on September 30, 1974 and to you and Her. ion III, Directorate of Hegulatory Operations by telecep

on September 30, 1974.

Thic report in submitted to you in accordance with the require-ments of Technical Specification 6.6.B.l.a. ,

.Very truly youra, COMMONWEALTH EDISON COMPANY QUAD-CITIES NUCLEAR POWER STATIO:i

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N.J. Kalivianakic Station Superintendent

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UJK/LLH/1k cc: Region III, Directorate of Regulatory Operationa J.S. Abel I.

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8307130193 741009 ,

PDR ADOCK 05000254 f g PDR CQPY SENT REGION y

O O REPORT NUMBER: A0 50-254/74-31 HEPORT DATE: October 8, 1974 OCCURRENCE DATE: September 29, 1974 FACILITY: Quad-Cities Huclear Power Station IDENTIFICATION OF OCCURRENCE:

Unit 1/2 Diesel Generator failed to start during monthly surveillance test.

CONDITIONS PRIOR TO OCCURRENCE:

Unit 1 operating steady state at 610 MWe.

Unit 2 operating at 300 MWe and increasing.

DESCRIPTION OF OCCURRENCE:

On September 29, 1974 the Unit 1/2 Diesel Generator monthly operability test was going to be performed. The diesel failed to start when the operator attempted to start it. The "l/2 DG FAIL TO START" alarm annunciated. An operator was imme-diately dispatched to the diocol generator room to investi-Gate. He found both air valves coming from the two sets of starting air accumulators closed. He opened the valves after which the diesel was started and tested successfully. Tech-

,nical Specification 3 9.E.1 was thus violated as a result of this occurrence.

DESIONATION OF APPARENT CAUSE OF OCCURRENCE:

Operator Error The apparent cause of this occurrence is designated as operator ;

crror. Both accumulator air valves were closed, thus prevent-ing air from being supplied P) the air start motors. On Sep-tember 19, 1974 the monthly maintenance department preventative maintenance inspection was performed. During this inspection, the normal practice is to have an operator close these two valves and standby in the diesel room during the course of the inspection. Apparently, the valves were either left closed i

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,. A0 50-254 October 8, 1974 o

) following this inspection or were inadvertently closed at come time between the incpection date and the date of the operability tout. There were no jobs performed or other reasons that required the air valves to be closed during the period between the two dates.

AHALYSIS OF OCCURRENCE:

The safety implications of this occurrence are minimized by the fact that the remaining; two diesels were operable at the t.ime. Additionally, all Emergency Core Cooling Systems and other Engineered Safeguard Eculpment ~ van also completely operable at the time of the occurrence. All 345 KV lines and both units' auxilliary transformers were also operable.

The health and safety of the public was not affected by this occurrence; nor were there any adverse effects on plant per-connel or equipment related to this occurrence.

CORRECTIVE ACTION:

The immediate corrective action in response to this occurrence was to immediately open the air valves and to run the diesel to demonstrate its operability.

The corrective action taken to prevent repetition of this occurrence was to chain the valves associated with the air start motor air supply for all three diesel generators and enter these valves in the 'S' lock log maintained by the Shift Engineer. Future operations of these valves uill thus be controlled by the Shift Engineer via the 'S' lock log.

. Additionally, the check sheet used during the preventative maintenance inspection will be revised to include verification that the air supply valves are closed and opened prior to and following the inspection respectively. '

i PAILURE DATA:

h There were no equipment failures associated with this occur-rence, thus there is no failure data to report. There have  !

been no similar occurrences in the past and it is felt that the  ;

corrective actions taken should preclude any similar failures  ;

in the future.

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