ML20085F838

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AO AO-09-74:on 740604,plugging Occurred on Intake Filter on Emergency Diesel Generator 1-1.Possibly Caused by Exhaust Fumes Blowing Back Into Open Adjacent Area Due to Wind Condition
ML20085F838
Person / Time
Site: Palisades Entergy icon.png
Issue date: 06/14/1974
From: Sewell R
CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To: Oleary J
US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085F843 List:
References
AO-09-74, AO-9-74, NUDOCS 8308230505
Download: ML20085F838 (2)


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\d A Lf concrai ort.ces. 2 2 west u.cn.9an Avenue, Jackson, Michigan 4Q201. Area Code 517 788-0550 June 14, 1974 Mr. John F. O' Leary, Director Re: Docket 50-255 Directorate of Licensing License DPR-20 US Atomic Energy Commission Palisades Plant Washington, DC 20545 A0-09-74

Dear Mr. O' Leary:

The attached abnormal occurrence report A0-09-74 describes the plugging of the intake filter on the emergency diesel generator.

Yours very truly, Ralph B. Sewell (Signed)

RBG/ce Ralph B. Sewell Nuclear Licensing Administrator CC: JGKeppler, USAEC

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l 8309230505 740614 PDR ADOCK 05000 COPY SENT REGION N

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O O ABNOINAL OCCURRENCE REPORT Palisades Plant l

1. Report No: A0-09-74
2. a. Report Date: June 14, 1974
b. Occurrence Date: June 4, 1974 3 Facility: Palisades Plant, Docket 50-255
4. Identification of Occurrence: Emergency diesel intake filter plugging.
5. Conditions Prior to occurrence: Refueling outage - plant in cold shutdown.
6. Description of Occurrence: During the monthly test run, diesel 1-1 would attain a stable load of 2.4 MW, which is 95% of rated. Investi-gation revealed no obvious governor or other control problems. However, the intake manifold pressure was low and exhaust fumes were dark. The intake filter canister was opened and revealed excessive black deposits on the filter element. This element was changed and a subsequent 2-hour full-load test run was completed successfully.
7. & 8. Designation of Cause and Anc. lysis of Occurrence: Both diesel intake ,

filters were cleaned about one year ago and at that time showed no l significant plugging. The other diesel intake filter still appears l to be clean and therefore raises the question of why this one plugged  !

more rapidly. The only plausible explanation seems to be that exhaust fumes blew back into the open adjacent area due to wind conditions dur-ing past running periods. This condition can easily exict and could have contributed to the premature plugging of the intake filter.

Since these filters are enclosed in a metal canister and are quite inaccessible, they have not received frequent inspection in the past.

9 Corrective Action:

a. A low limit has been placed on the manifold pressure readings taken during monthly runs. A reading of <l5 psi (the incident reading was 11 psi) will initiate changing of the filter.
b. A 3-month inspection interval has been established via the plant preventive maintenance program. This will provide in-spection after every 6- to 10-hours of diesel running.
10. Failure Data: None

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