ML19317F935
| ML19317F935 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 10/14/1976 |
| From: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| Shared Package | |
| ML19317F936 | List: |
| References | |
| NUDOCS 8002210648 | |
| Download: ML19317F935 (2) | |
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' SACRAMtNTO MUNICIPAL UTILITY DISTRICT C 1708 59th Street. Oox 15820. Sacramento. Cahfornia 95813;(916) 452 3211
%J October 14, 1976 8
,9 Mr. R. 11. Engelken g8 Director of Regulatory Operations to 6
NRC Operationn Office,-' Region V 007 2G 1976 I 1990 N. California Boulevard g
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Walnut Creek Plaza, Suite 202
'g g Walnut Creek, California 94596 g
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Re: Operating License DPR-54 C
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Docket No. 50-312 Reportable Occurrence 76-14
Dear Mr. Engelken:
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vi In accordance with Technical Specifications for Rancho Seco Nuclear Generating Station, Section 6.9.1, and Regulatory Guide 1.16, Revision 4, Section C.2.b.(2), the Sacramento Municipal Utility District is herchy reporting the following Reportable Occurrence as RO 76-14.
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An unsuccassful attempt was made to start the "B" Diesel Generator
( jfrom the Control Roon start pushbutton on September 26, 1976.
Following this failure, further attempts were made to start the diesel, four of which were successful and three of which failed.
Electrical technicians investi-gating the trouble discovered a defective microswitch in the speed increaser and replaced it.
Iloweve r, the increaser appeared to be working properly and
,7; later failures showed this not to be the prob 1cm.
It was observed that while the speed increaser was operating, the fuel racks were not opening; therefore isolating the problem to the governor.
On October 1 technicians discovered the governor oil level was above
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the high level narh and drained it to the proper level. Overfilling would
'l not have caused the failures unless it was excessive, which was not the case.
'A representative f rom a diesel service company investigated the problem and found no abnormalities, af ter checking the governor booster oil pump.
j The next day it was decided to drain the governor oil and replace it,
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. assuming the possibility that dirty oil and deposits caused the failures.
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Af ter the oil change,~ the dienc1 started four times, had one failure, then started'four more tinas. On October 4, the diesel started five times without a failure and cotr.pleted ~a two-hour run.
On October 6 a representative f rom the governar manufacturer inspected the system and agreed that the oil and
--deposits might be the probica. While starting t he diesel successfully eight 2.
times, the oil was drained and replaced three times (running the governor up g
and 'doen between oil changes).
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,s Mr.
R. H.
Engelken October 14, 1976 Based on the seventeen successful starts without a failure and the marked decrease in failure rate following the initial governor oil replacement, the "B" diesel generator was declared operable. A periodic maintenance schedule will be fj established for replacing the governor oil.
Throughout the period that the "B" diesel generator was out of service, the "A" generator was available and operable.
The plant was in a cold shutdown for main generator repairs during this, period.
It was previously reported (A0 76-9)
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that the "B" diesel generator experienced similar start failures for which no cause could be determined. As in this instance, the cause might have been the governor oil, but this cannot be verified.
The diesel generator is a Bruce, G.M, Diesel, Type G 886B rated at 2750 KW.
j The governor is manufactured by Woodward Governor Company, Fort Collins < Colorado. rd Respectfully submitted, f
b. ". fmtY I
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J. J. Mattimoe
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Assistant Genral Manager and Chief Engineer m
9 JJM:RWC: sal Attachment es: !!IPC (3)
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