ML19260C734

LER 79-101/03L-0:on 791212 & 13,w/reactor in Run Mode & on 791216,w/reactor in Cold Shutdown,Diesel Generator C Failed to Start.Apparently Caused by Particles of Rust in Governor Booster Servo.Servo Cleaned & Reinstalled

ML19260C734
Person / Time
Site:	Hatch
Issue date:	01/03/1980
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19260C728	List: ML19260C727 ML19260C734
References
LER-79-101-03L-01, LER-79-101-3L-1, NUDOCS 8001080530
Download: ML19260C734 (3)

Text

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DATE 14 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 l With the reactor in the run mode, on December 12, 1979 and again on December 13, 1979.l o 3 l the 'C' Diesel Generator, IR43-S001C, failed to start within 7 seconds while perform- l o 4 l ing procedure HNP-1-3801, Diesel Generator Manual Start. The 'C' Diesel was being l

[o isl l run to comply with Technical Specifications 4.5.B.2 and 4.5.J.2. This Diesel also l g I failed on December 16 with the reactor in cold shutdown. The 'C' Diesel was declared l lo l 7 l l inoperable af ter each incident and preparations made to comply with Technical Specifi-l o 8 l cations 3.5.B.3 and 3.5.J.2 after the first two incidents. Reference Reportable (cont)I

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44 47 CAUSL DESCRIPTION AND CORRECTIVE ACTIONS h l s l o l l Af ter the start failure on December 12, 1979, the Diesel was started from the local l

li li j l station which bypasses the 7 second control circuit. After 1R43-S001C was shutdown, i i , [ it was successfully restarted from the remote station and HNP-1-3801 performed satis i i 3 l factorily. When the Diesel failed on December 13,1979, the Governor Booster Servo  ;

13 j a j l was disassembled, cleaned and reinstalled. HNP-1-3801 was then performed and (cont) ;

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Georgia Power Company Plant E. I. Hatch '

Baxley, Georgia 31513 Reportable Occurence Report No. 50-321/1979-101.

Event Description and Probable Consequences (Cont).

Occurrence No. 50-366/1978-60 for a similar incident of this type. Public health and safety were not effected by this incident. ,

Cause Description and Corrective Actions (Cont).

found acceptable. After the 'C' Diesel failed again. on December 16, 1979,

- the vendor was consulted as to the availability of a spare servo. The vendor advised swapping the servo with one of a newer design. A new type Governor Booster Servo was installed and Procedure HNP-1-3301 performed satisfactorily on December 18, 1979.

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NARRATIVE REPORT D D F

Dh Georgia Power Company Plant E. I. Hatch Baxley, Georgia 31513 Reportable Occurrence Report No. 50-321/1979-101.

With the reactor in the run mode, on December 12, 1979, and again on December 13, 1979, the 'C' Diesel Generator,1R43-5001C, failed to start from the remote

- .. station within 7 seconds while performing procedure HNP-1-3801, Diesel Generator

'fianual Start. The reactor power was at 83'; during the first incident and at 16% power when the second incident occurred. 1R43-5001C also failed to start, on December 16, 1979, with the reactor in cold shutdown. The 'C' Diesel was being run due to a Plant Service Water Pump and a Low Pressure Coolant Injection Subsystem being inoperable, Technical Specifications 4.5.J.2 and 4.5.B.2.

After each failure the 'C' Diesel was declared inoperable and following the -

first two incidents preparations were made to comply with Technical Specifications 3.5.B.2 and 3.5.J.3, cold shutdown within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

._ After the start failure on December 12, 1979, the Diesel was started from the local station which typasses the 7 second, timed,, centrol circuit. After 1R43-S001C was shutdown, it was successfully restarted from the remote station, llNP-1-3801 was then performed satisfactorily and the Diesel declared operable.

When the second failure occurred, on December 13., L979, particles of rust were found in the Governor Booster Servo which prevented the piston from operating freely. This was the apparent cause of the firsit failure also, as the Diesel

.could be started and shutdown locally, it would then start from the remote station.

The piston and all internal parts were cleaned and the servo reassembled.

}{NP-1-3801 was then performed satisfactorily.

When the final failure occurred, on December 16, 1979, the vendor was consulted as to the availability of a spare servo. It was advised that the type of Governor Booster Servo, presently installed, be repT. aced with one of a newer design.  ;

After acquiring and installing the new type of Serve, HNP-1-3801 was performed and the 'C' Diesel placed back in operation on December 18, 1979.

Due to the possibility of there being a re-occurrence. to one of the remaining

- Unit I Diesels, the new type Governor Booster Servo is being ' installed. The Unit II Diesel Servo's will not be changed as the Diesels were initially equipped with the newer type.

A similar incident in which a dirty Servo was a contributing factor to the failure of a Unit II Diesel Generator was reported.on Reportable Occurrence No. 50-366/

1979-60. The maintenance procedures were revised in 1978 to include cleaning of the Servo periodically.

._ _ _ .Pmbl.ic _hnalthand ufety were not effected by thiis incident. 17D4 107 e