ML20085F744

AO AO-12-74:on 740702,diesel Generator 1-1 Failed to Be Ready to Load within Required Time After Start,During Monthly Tech Spec Test Run.Caused by Impurities in Governor Oil.Governor Drained & Flushed W/Fuel & Clean Oil

ML20085F744
Person / Time
Site:	Palisades
Issue date:	07/15/1974
From:	Sewell R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085F748	List: ML20085F744 ML20085F759
References
AO-12-74, NUDOCS 8308230167
Download: ML20085F744 (3)

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Mr. John F. O' Leary, Director -j h' ~ h{

, l Docket 50-255

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A7)Re: License DPR-20

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US Atomic Energy Commission , Palisader Plant Washington, DC 20545 ( ,Q < -,,,

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Dear Mr. O' Leary:

Attached is Abnormal Occurrence Report A0-12-74 coverin6 the excessive starting time for 1-1 diesel generator.

Yours very truly, Ralph B. Sewell (Signed)

RBS/ map Ralph B. Sewell CC: JGKeppler, USAEC P .__ .

COPY SENT REGION t .,

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8308230167 740715 PDR ADOCK 05000255 S PDR t i

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O O ABNORMAL OCCURRENCE REPORT Palisades Plant

1. Report No: 12-74 2.a Report Date: July 15, 1974 2.b Occurrence Date: July 2, 1974 3 Facilfty: Palisades Plant

h. Identification of Occurrence: 1-1 Diesel Generator - Excessive starting time.

5 Conditions Prior to Occurrence: Refueling Outage - Plant in cold shutdovn.

6. Description of Occurrence: The Monthly Technical Specifications test run of diesel generator was conducted in accordance with Test Procedure MO-7 The diesel failed the test in that it was not ready for loading until eleven seconds after start signal. Technical ,

Specifications Section h.71A requires diesel ready for loading within ten seconds.

7 Designation of Cause: Impurities in governor oil.

8. Analysis of Occurrence: The failure of this diesel generator to be ~

ready for loading within ten seconds voald not have resulted in the failure of necessary safety equipment to respond in the time re-quired under postulated accident conditions. The redundaat diesel generator, which was test started at the same time, was ready for ,

loading within ten seconds.

A special plant ruriev committee meeting was convened to evaluate the problem. It was concluded that this was most likely inadequate fuel oil priming in that the unit functioned properly in all other aspects. The committee assigned the problem to plant engineering j for further investigation. This investigation resulted in the con-l clusions that the governor was responding in a sluggish manner and -

was not getting fuel to the engine in time for engine to start in l required time.

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9 Corrective Action: In accordance with tech manual instructions (Woodward Bulletin 37708E), the governor oil was drained and the governor flushed with fuel oil and then clean oil. The governor was then filled with oil and the diesel generator test started satisfactorily. This restored the unit to a fully operational condition and corrective action is considered complete.

Consideration was given to a preventative maintenance schedule whereby the governor oil could be changed and/or the governor flushed periedically, but it was concluded that this would not contribute to the prevention of recurrence, even though it appears there was an impurity or dirt in the governor oil which was causing the problem, Introduction of impurities to this oil system has no cumulative nature due to length of operation. The likelihood of impurities is probably increased with an in-creased oil change frequency.

10. Failure Data: No previous similar failures experienced.

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