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I King of Prussia, Pennsylvania 19406 AUG 171973 Jarsey Central Power & Light company Docket No. 50-219
/.ttenties : Mr. I. R. Pinfrock, Jr.
Vice President - Generation 4
i Medisco Avenue at Pusch Bowl Road Morristeen, New Jersey 07960 Gestimment I
i The reports of your action in response to Regulatory Operations i
Bulletin No. 73-3, dated July 27, 1973, and other information 1-concerning Bergen-Paterson hydraulic shock absorbers, indicates that additional action is advisable.
I Paclosed is Regulatory Operations Bulletin No. 73-4 which provides you with additional information and lists certain actions that appear appropriste on a timely basis. The Directorate of Licensfag currently is evaluating the need for a i
continuing surveillance program for hydraulic shock absorbers.
You are requested to take the action shown under ACTION INDICATED in the enclosed Regulatory Operations Bulletin No. 73-4, dated Auguat 17, 1973.
4 Should you have questions concerning this matter, please contact me.
Sincerely, I
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James P. O'Reilly Director 3
hi Raciosure 30 a=11stin No. 73-4 cc: Mr. J. T. Carroll, P1 mat Sverintendent bcct PDR Local PDR NSIC h 4I h 9 960213 TIC DEKOK95-258 PDR
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Jersey Central Power & Light Company M Aol5oN AVENUE AT PUNCH BOWL Ro Ao e MoRRISToWN. N.J. 07960 e s39 6111 August 17, 1973 y
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Q AUG gO 1973-&,
N Mr. A. Giambusso Deputy Director for Reactor Projects
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United States Atomic Energy Commission
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Washington, D. C. 20545 W
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Dear Mr. Giambusso:
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Subj ect: Oyster Creek Station Docket No. 50-219 O,,
Diesel Generator The purpose of this letter is to report a failure of a component which could have caused the failure of No. I diesel generator to start. This event is considered to be an abnormal occurrence as defined in the Technical Specifications, Paragrcph 1.15D.
Notification of this event, as required by tho ' Technical i
SpeciG cations, Paragraph 6.6.2a, was made to the AEC Region 'l Directorate of Regulatory Operations on tiednesday, August 8, 1973.
While conducting - routine six-month surveillance inspection of the j
No. I diesel generator, it was discovered that one of the two stnrting motors failed to engage. This engagement failure would have prevented the unit from starting under normal conditions. Tne engagement shaft bushing at the pinion i
end of the starting motor was discovered to be rotating with the shaft.
Due to wear, the bushing had slipped out of pcsition thus preventing the pinion gear j
i from engaging the engine ring gear.
Details of the diesel generator starter are as follows:
Manuft.cturer: Delco Remy Model No.:
1109758H 3erial No.:
222 Voltage:
64VDC Prior starter failures, although all associated with failed or weak starter solenoids, are tabuinted below:
Date Dicsc1 Cencrater Problem j
10/19/69 2
Both starter pinion solenoids were burnt, causing "hard" dc }y[
systcx ground.
2/?:/70 1
No c.u"-en found.
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August 17, 1973
'd Mr( A. Giambusso
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- t-Date Diesel Generator Problem
-10/03/70 1
Starter motor pinions not en-gaging the ring gear properly.
12/04/72 2
One of the two starter motor pinions failed to engage.
Heavier duty solenoid installed.
1 Based on our review of past starter failures, this appears to be the first one associated with mechanical failure of the starting motor. To correct this situation, a new starter motor was installed and tested satisfactorily.
Control lead connections were tightened and a satisfactory operability test was then conducted.
The significance of.this event is minimal due to the fact that the difficulty was identified and corrected in conjunction with a routine six-month surveillance inspection. Had this condition gone undetected, a failu,e 'sf one diesel to start has been considered in Appendix L to the FDSAR which ecatains a probability analysis regarding the availability of standby cooling systems and includes an analysis of off-site power availability concurrent with a loss of coolant accident. The results indicated that the reliability of available power from off-site sources or from a self-contained unit -- only one diesel generator-was considered in the analysis -- was quite high. Since the station is provided with two separate diesel generator units, having one unit out of service has no offect at all upon the results of the analysis., In addition, the effects of single bus operation during a loss of coolant accident was analyzed in Amendment 32 to thc l'DSAR and the unit loading under this condition was found to bc within the normal KVA rating of the diesel generator. Thus, there is' no additional safety significance associated with this esent beyond that already analyzed.
To prevent this type of failure from reoccurring, the diesel manufacturer (General Motors) will be contacted and raquested to supply the following:
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(a) Recommendations for, a posit'.ve locking mechanism to secure the shaft bushing at the pinion end of the starting motor.
(b)
Recommendations for preventative maintenance on the diesel generator starters.
In addition, the station's semi-annual diesel generator inspection procedure will be reviewed and revised, as required, based on the experience gained from this event and possibic future recommendations from the manufacturer.
We are enclosing forty copics of this report.
Very truly yours,n b
OM4 c
Donald A. Ross
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Mananer, Nucicar Generating Stations ph cc: fir. J. P. O'i cilly, Director liirectorate of Regulatory Operations, Region 1