ML20147A939

/03L-0 on 780811:During Change of Engine Sump Lube Oil on 1A Diesel Generator,Lube Oil Was Diluted with Diesel Fuel oil.1B Diesel Generator & Other AC Sources Provided Required Elec Pwr.(Encl to 7809270110)

ML20147A939
Person / Time
Site:	La Crosse File:Dairyland Power Cooperative icon.png
Issue date:	09/15/1978
From:	Shimshak R DAIRYLAND POWER COOPERATIVE
To:
References
LER-78-010-03L-0, LER-78-10-3L, NUDOCS 7809270116
Download: ML20147A939 (1)

Text

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CONT ROL BLOCK: l l l l l l l (PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATIONI 1 ti 10 l1 7 H 9 ] l W l Il L l B l R l 1l@lbl0l0l-10l0l0l0l0l-l0l0l@l4l1l1l1l1l@l LICEN5EE CODE 14 LICE NSE. NUMU E R 26 2b LICENSE TYPE JO l

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CON'T 10l11 "7 [ l L60 l@l 610 l 5 l 0DOCKET l - 10 l 4 l 0 l 689 @l 01811 l1 l 718 l@l019REPORT 14 7$ l1 l 5DATEl 7 I RB0 l@

7 8 NUMBER 69 EVENT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l

lo l2l l1A DIESEL GENERATOR WAS TAKEN OUT OF SERVICE FOR ONE HOUR AND TWELVE MIN

[o l3 l lUTES DURING REACTOR OPERATION TO CHANGE ENGINE SUMP LU% OIL. LUBE OIL l lo l4 } i WAS DILUTED WITH DIESEL FUEL OIL. 'B DIESEL GENERATOR AND OTHER A.C. S I lolsl l OURCES REMAINED OPERABLE TO PROVI' ', REQUIRED BACKUP A.C. ELECTRICAL POW j lo lo ] l ER. I 10 l 71 l _j I

l o 181 l 80 7 8 9 C DE CODE SUBC DE COMPONENT CODE SUBC DE SUS E 10191 l E l E lh l X lh [Z j @ LZ,l Z I Z l Z l Z l Z l@ l Z lh [Zj 18 19 20 7 8 9 10 11 12 12 SEQUENTI AL OCCURRf NCE REPORT R E VISION EVENT YEAR REPORT NO. CODE TYPE N O.

Ogg LEP 40 17181 L-J 1011101 1-1 10131 IL I l-l 101

_ 21 22 23 24 26 27 26 29 30 31 32 ThKE A T ON ON PL ANT ' MET HOURS SJB IT F OR Ai h 8. SU PLIER MAN F CTURER IX l@l2 l@ lM Z l@ l36Zl@ l0 10 l 0 l O_j [Y_j @

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33 34 3 40 42 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS ,

l i j o l l PARTIAL DILUTION OF LUBE OIL ATTRIBUTED TO RESIDUAL FUEL OIL IN INJECTOR l l

li l1 l lS. FOLLOWING OIL CHANGE. TECHNICAL SPECIFICATION SURVEILLANCE TESTING W 1

l i l 71 l AS PERFORMED ON BOTH DIESEL GENERATORS TO VERIFY OPERABILITY. ADDITIONA gii3l l L SAMPLING BY IMPROVED PROCEDURES WILL BE PERFORMED TO PROVIDE FURTHER B]

g ASIS FOR ACCEPTANCE CRITERIA AND DETERMINATION ( RATE OF DILUTION. l gii4i 7 8 9 80 ST S  % POWER OTHE R ST ATUS ISCO RY DISCOVERY DESCRIPTION NA l l I1 I 5 l [ E_ J @ l 0 l 8 l 1 l @ l lBl@l LUBE OIL SAMPLE RESULTS A TIVI T Y CONTENT RELE ASED OF PELE ASE AMOUNT OF ACTIVITY LOCATION OF RELEASE l

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NA l l 46 NA 60 1 e 9 to 11 44 PERSONNEL F *POSURES NUMPER TYPE DESCRIPTION NA l li l 71 l 0 l 0101@l Z l@l *

' " ' NJ',N;URES n R NU,m R oE SCn, nO~ @

NA l li l aHl 91010101@l 1 11 12 80 LOh5 Of OH DAMAGE TO F ACILI TY TYPE DE SCRIPTION NA l I i I 9 I Lz_J@l 80 7 M 9 10 Pub t lCI T ' N RC USE ON L Y

, e gg["'"'"' ~ y, No D 7 o / K i 68 69 i , , i i i i i , , i i ii 80 5

/ MU fu R. E. SHIMSHAK pn og g . 608-689-2331 {

N AYE Of PHEPAHER __ . _

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.- .V ATTACHMENT TO LER. 78-010-030L-0 LAC-5459 DAIRYLAND POWER COOPERATIVE LA CROSSE BOILING WATER REACTOR (LACBWR)

DOCKET NO. 50-409 On July 21, 1978, samples of lubricating oil were taken.from the respective-sumps (crank-cases) of emergency diesel generators lA and 1B. The sampling had been initiated as part of an improvement in the overall preventive maintenance program for mechanical equipment. .

On. August 11, 1978, a representative of the oil company laboratory performing the analysis informed the LACBWR Mechanical Engineer by telephone and later by telegraph that the lubricating oil sample from emergency diesel generator LA indicated 9.8% dilution with fuel oil. .Since this represented a gross dilution according to oil company standards, the representative recommended that the lube oil ,

be changed. The oil sample from emergency diesel generator.lB '

indicated moderate dilution with fuel oil, but a recommendation for oil change was not presented.

The reported results and recommendations were discussed by plant management personnel and it was decided to take the 1A emergency .

diesel out of service for a temporary period of time sufficient to changa the engine oil. This was done with the diesel generator being out of service for only one hour and twelve minutes. The reactor was being operated at approximately 81% with the generator connected to the Dairyland Power Cooperative grid at 39 MWe gross.

Following the oil change, emergency diesel generator lA was re-turned to service and test run satisfactorily. Surveillance requirements specified in Reference 2 were accomplished. Emergency diesel generator 1B was test run satisfactorily.

The engine lubricating oil for the diesel engines is normally changed on an annual basis. Experienced diesel engine service personnel have  ;

indicated that the presence of fuel oil in the lubricating oil does not pose a problem unless the volume of the mixture in the crank- i case increases noticeably. Operating the engines at least twelve i continuous hours is regarded as a sufficient length of time to permit evaporation of the fuel oil' diluent.

Since no prior samples of lubricating oil had been taken-for analysis, a comparision basis had not been established. . Improvements in samp-ling procedures will better guarantee representative samples and a program offincreased sampling will enable a determination of the rate of dilution-and provide advisory information for preventive maintenance.

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