ML20009F318

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

ML20009F318
Person / Time
Site:	Cooper
Issue date:	01/18/1978
From:	NEBRASKA PUBLIC POWER DISTRICT
To:	Goller K Office of Nuclear Reactor Regulation
Shared Package
ML20009F317	List: ML20009F316 ML20009F318
References
NUDOCS 8107300287
Download: ML20009F318 (4)

Text

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o- GENERAL OFFICE P. O. box 499, COLUMBUS, NEDR ASKA 68601

        .n           Nebraska Publ.ic Power Distric
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! January 18, 1978

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Director, Nuclear Rcactor Regulation 77 Attention: Karl R. Coller ,w d 'f - ,V Assistant Director of Operating Reactors

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Division of Operating Reactors p %. IS/ U. S. Nuclear Regulatory Cornission 19 %f,g % g -- , Washington, D. C. 20555 5'

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Subject:

Standby Diesel Generator Study -

Reference:

Letter, Karl R. Coller to All Power Reactor Licensees, dated December 15, 1977.

Dear Mr. Goller:

This letter is in response to the referenced letter which transmitted a questionnaire pertaining a reliability study of Standby Diesel Generator Units. It was requested that the questionnaire ba completed and one copy returned to your office by January 20, 1978. We have completed the question-naire and are submitting one copy, for your review and use, as an enclosure to this letter. Additionally, it was requested that we identify the individual responsible for completing the questionnaire, follow-up communications, or for arranging a reactor site visit. This individual is: Mr. L. C. Lessor Station Superintendent Cooper Nuclear Station P. O. Box 98 Brownville, Nebraska 68321 Phone (402) 825-3811 i i f0t d 8107300287 810720 I PDR ADOCK 05003298 0260o 3% F PDR i

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S. Are any foreign gases such as propane, freon, halon, carbon ' pr_. dioxide, etc. stored in the: Diesel Engine room? ' or adjacent buildings? Yes No X s Yes x No . i d,f.

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If yes, (other than hand portable fire extinguishers), then Pp identify gases and give approximate tank size. y 76 75 lb. bottles  ; Gases Carbon Dioxide Volume ti sw T. Does control system automatically bypass, in emergency starting, 2ny engine temporarily out of service for No X maintenance? Yes ' If yes, then hod many failures to bypass have occured? U. Does the control system automatically override the test mode under emergency conditions? Yes x No V. Have repetitive mechanical failures occurred in any component part or subsystem of the engine, generator, or switch gear, etc.? Yes X No If yes, then which part or subsystem? copoer tubing How many failures? Three Tubing develooed leaks, was reolaced Give nature of failure. with stainless steel and no leaks have occurred since. Would periodic (yearly or other) evaluation and/or testing U. f33

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

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Give brief reasons for the answer. ----

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/ X. 1. Give the accumulated time-load operating record for each - diesel-generator unit from installation to the present .. . .

.                                                                                                                            11 (Running Hours):

1-11-74 Y)

 -                         Preoperational test Date                .                                                         01 Sury. Testing & :               Emergency     :    Total   :              7      .

Engine  :  : Hours  : . !1 Maintenanca Hrs. : and Other

Seria! Ho  :

Service Hrs. :  :

                         -                  :    No Load        Loaded

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0 336 . 7103 UN 336 . 0 320 l UN { 320 j l

l. 7102  :  :  :

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2. Surveillance test load (percent of continuous rating)

3. Give the projected or planned time-load operation for each diesel-generator unit during the next 12 months.

Total  :  :

Emergency  :

Surveillance & Hours  :  : .

llaintenance Hrs. : and other  :

: Service Hrs. :  :  :

0 40  :  :

40  :  :

4. Provide the follceing sunmary of the periodic surveillance testing experience:

1974 #

a. Starting date of surveillance testing (0L date) Jan. .

monthly I

b. Periodic test interval l j

c. d. Total number of surveilTance tests performed Total number of test failures 7 210 (1i:  ! l* 3

  ;                                                                               failure to accept load _ o failure to start _ 4 failures due to operator error        o               ;ft'g
   ,'                                 failure to carry load           3                                                                     E' failure due to equipment not being operative during emergency                                     N'     ,

conditions 0 L. .

e. Supply a copy of the surveillance test procedures with this completed questionnaire. See attached.

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   ,-                                         -2 2-Additional Comments      ,

We have listed UN on several frome- tco k n 1 4 n m, 4"~~~ t4 the requested information does not warrant additinnni ', [,l , 2. effort to obtain the information. If there is dis- (, agreement on this matter, we will revaluate if contacted. [

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Y. General Suggestions Briefly give conetructive criticism or suggestions as to improvement in reliability of the diesel generators. These remarks may cover tests, naintenance, orattices, orders, policy, adjustmenti, etc. yc - i ,

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