05000366/LER-1981-036-03, /03L-0:on 810416,diesel Generator 2C Failed to Obtain Rated Voltage Less than or Equal to 12-s Per Fsar. Caused by Field Flash Circuit Failure & Generator Being Excited by Residual Magnetism.Field Flash Relays Ordered: Difference between revisions

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{{Adams
#REDIRECT [[05000366/LER-1981-036-03, /03X-1:on 810416,while Performing Surveillance for Emergency Diesel Generator 2C,generator Failed to Obtain Rated Voltage.Caused by Failure of Field Flashing Relays Due to Binding]]
| number = ML19347E707
| issue date = 05/07/1981
| title = /03L-0:on 810416,diesel Generator 2C Failed to Obtain Rated Voltage Less than or Equal to 12-s Per Fsar. Caused by Field Flash Circuit Failure & Generator Being Excited by Residual Magnetism.Field Flash Relays Ordered
| author name = Coggin C
| author affiliation = GEORGIA POWER CO.
| addressee name =
| addressee affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
| docket = 05000366
| license number =
| contact person =
| document report number = LER-81-036-03L, LER-81-36-3L, NUDOCS 8105130253
| package number = ML19347E702
| document type = LICENSEE EVENT REPORT (SEE ALSO AO RO), TEXT-SAFETY REPORT
| page count = 2
}}
{{LER
| Title = /03L-0:on 810416,diesel Generator 2C Failed to Obtain Rated Voltage Less than or Equal to 12-s Per Fsar. Caused by Field Flash Circuit Failure & Generator Being Excited by Residual Magnetism.Field Flash Relays Ordered
| Plant =
| Reporting criterion =
| Power level =
| Mode =
| Docket = 05000366
| LER year = 1981
| LER number = 36
| LER revision = 3
| Event date =
| Report date =
| ENS =
| abstract =
}}
 
=text=
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EVENT DATE 14 75 RE POHT DATE 80 EVENT DESCnfPTION AND Pno0ABLE CoNSEoVENCES h I 'l21 lUnit 2 was operatino at rated power.
While performing surveillance for l O a l emergency diesel generator 2C, the generator failed to obtain rated l
l voltage less than or equal to 12sec as required by FSAR table 8.3.3.
Rated i
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! voltage was obtained in 18 seconds, and the-diesel was available to l
O s IOlsiIsupply emergency AC power had it been needed.
An LC0 was declared per i
O 7 lunit two Tech Specs 3/4.8.1.
The event is nonrepetitive.
There were i
10181 I no ef fects upon public sa fety and health.
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33 34 35 36 31 40 41 42 43 44 47 cAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 12101IThe field flash circuit failed and the generator excited by residual I
11111 Imaanet ism.
Followinq a maintenance inspection the surveillance proc-I fiTil ledure was success fully performed, and the di esel was returned to an j
t rial loperable status.
New field flash relays are on order and will be in-l 11141 ls tall ed upon receipt.
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LER f:
50-366/1981-036 l
Licensec:
Georgia Power Company Facility Name:
Edwin I. Ilatch Docket #:
50-366 i
i 1
 
=Narrative=
Report for LER 50-366/1981-036 i
On 4-16-81, while Unit 2
was operating at rated
: power, surveillance procedurc " Diesel Generator Manual Start," IIN P '
3801, was in progress for dicsc1 2C.
The dicsc1 was manually started, and the generator failed to reach rated voltage in less than 12 seconds as required by PSAR tabic 8.3.3, but was obtained in 18 seconds.
Two subsequent starts were performed for observation, and a
repeat of the same voltage delay occurred although the dicsc1 engine started satisfactorily each time.
Annunciator
" Generator Field Ground" did not momentarily alarm as it usually does during a dicsc1 start indicating the battery system is tied to flash the ficid.
It became apparent residual magnetism provided generator excita-tion.-
4 Diesel 2C was declared inop.
Later following a maintenance inspection, three successful troubicshoot manual starts were performed without voltage delay.
Surveillance procedure
" Diesel Generator Manual Start",
IIN P 3 8 01, was completed satisfactorily and diesel 2C was declared operabic.
This event-is nonrepetitive.
There ucre no effects upon public safety or health.
The apparent cause of field flashing relays to operate was due to effects resulting from motoring the dicsc1 generator during test runs following engine rcpair reported by LER 50-366/1980-159.
New relays arc on order and will replace those in service upon receipt.
1 1
1 l
1
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}}
 
{{LER-Nav}}

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