ML20009F155

Forwards Completed Questionnaire Re Standby Diesel Generator Units,In Response to NRC 771215 Request

ML20009F155
Person / Time
Site:	Palisades, Fort Calhoun
Issue date:	01/20/1978
From:	Short T OMAHA PUBLIC POWER DISTRICT
To:	Goller K Office of Nuclear Reactor Regulation
Shared Package
ML20009F154	List: ML20009F153 ML20009F155
References
NUDOCS 8107290255
Download: ML20009F155 (4)

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Omaha Public Power District -

e OndAMA. NgsmasMA 68102 e TELEPMONE 536 4000 AREA CODE 402 1623 MANNEY January 20, 1978 N -

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Assistant Director for Operating Reactors g ,

ATTN: Mr. Karl R. Goller (p Z

(D, u ,. j'ppf9, .E-Division of Operating Reactors U. S. Nuclear Regulatory Commission .g. %Q' "

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Washington, D. C. 205S s f),, *-

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Reference:

Docket No, 50 ~35 M, Q ..~. M. ..-

- Gentlemen:

The Omaha Public Power District received a letter from the Commission, dated December 15, 1977, request-ing that the District complete a questionnaire in regard to standby diesel generator units. Accordingly, please find attached, a completed questionnaire and supporting materials.

Informal follow-up communications in regard to the questionnaire should be addressed to Mr. 3. J. Hickle; telephone. number. 402-536-4413. Written commuzacations should continue to be addressed to the .tndersigned.

Sincerely, M

@ T. E. Short Division Manager a Production Operations TES/KJM/BJH : jmm Attach.

h l Yf 8107290255 810720 1 PDR ADOCK 05000285 F PDR 730270032-

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. 4 S. . Are any forcinn nases such as propane, freon, halon, carbon dioxide, etc. storca in the: Diesel Engine room? No x Yes No x or adjacent buildings? Yes If yes, (other than hand pcrtable fire extinguishers), then identify gases and give approximate tank si:c.

3 Gases Volume (ft ) ,

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- T. Does control system autcmatically bypass, in emergency

• starting, any engine temporarily cut of service for maintenance?' Yes No x If yes, then how many failures to bypass have occured?

U. Does the control system autcmatically overrice tne test mode under emergency conditions? Yes No x Have rapetitive mechanical failures occurred in any ccm:c .or? ut Y.

or subsystem of the er.gine, generator, or switch gear, e::.'

Yes x No If yes, then whith part or subsystem? air-start system

How many failures? 14 Give nature. of failure. Moisture in system clocced motors. This problem has been alleviated by blowing down the system more frequently.

W. Would periodic (yearly or other) evaluation and/cr testinc -

i by "outside experts" contribute significantly to the diesel-generator reliability? Yes No x -

Give brief reasons for the answer. Sufficient expertise exists within the District for normal maintenance and testing. ~

The manufacturer is ava11acle snouldsar.y assistance be required.

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1. Giv? the accumulated tice-load operating record for each X. diesel-generator unit from installation tu the present (Running flours): .

Preoperational test Date 4/73 Emergency  : Total  :

i Engine  : Sury. Test:nq &  :

Hours  :

itaintenance firs. : and Other

Serial no, . :  :. Service Hrs. ::

: No Load : Loaded  :

48  : 62  : 112  :

, : 70-Cl-10 5 2 2  :  :

: 115 -

65  :

2  : 48  :

70-Cl-10 6 9  :  :

1 l  :  :  :

100%

2. Surveillance test load (percent of continuous rating)

3. Give the proj cted er clanned time-load coeration for each diesel-generator unit curing the next 12 ?,cntns.

Emergency  : Total  :

iSurveillance 4 Hours  :  :

ftaintenance Hrs  : and other :  :  :

: Service Hrs. :  :  :

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2  : 28

26  :  :

4. Provide the follcuing surcary of the periodic surveillance testing expe ri ence..

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a. Starting date of surveillance testing (0L date) minor monthly;

[ b. Periodic test interval 52 *Q i

c. Total numoer of surveili6nce tests acrrormea 9 __

d. Total nuncer of test failures 7 failure to accept load 1

• failure to start i

1 failure to carry loac failures cue to ocerator error l'

failure due to equipnent not Deing operative curing ettergency 0

condi tions

.e. Supply a copy 'of the surveillan'cc test prececures wi:h this ccmoleted cuestionnaire.

'This includes failure to start within prescribed 10 seconds.

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Addi tional Cc:- .e- .-

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Y. General Succestions .l:'

- i; Briefly give constructive cri tici s :- su;---- --- ~ ' -

f improvement in reliability of the -i:se' r0 -

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,s remarks may cover tests, nontenanc2.

policy, adjustments, etc. ,i. 7 .

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Initial problems with the diesel generators were du_ 3.3:er. l marily to moisture accumulating in the air-s tar:  ;,

These dif ficulties were cc= pounded by the fac: cha: :.n eC n-ductwork for the radiators was open to the catside.

the temperature near the

'C-sequently, during cold weather,  ;,

diesels was low enough to promote free::ing of the water In the air system.

problems by :.ct- ..

The District has corrected the air-start stalling automatic dampers in the radiator duc wcrk and

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3 initiating frecuent blowdown of the moisture in the air d system.

In addition, comprehensive maintenance and sur- Q veillance procedures have been developed. .

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As a result of these measures, reliability of the andemer:ency this T.j diesel generators has improved dramatically, . .

lacle. .g system is now considered to be very re3 , . ,

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