ML20012E957

Forwards Annual Diesel Generator Reliability Data Rept,Per Tech Spec 6.9.1.12.Rept Provides Number of Tests (Valid or Invalid),Number of Failures for Each Diesel Generator at Plant for 1989 & Info Identified in Reg Guide 1.108

ML20012E957
Person / Time
Site:	Farley
Issue date:	03/27/1990
From:	Hairston W ALABAMA POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
RTR-REGGD-01.108, RTR-REGGD-1.108 NUDOCS 9004090162
Download: ML20012E957 (3)

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Alabama Power Comp:ny

" 'i 40 invernese Center Parkway

. Post Office Box 1295 L Birmingham, Alabama 3520l Telephone 205 86B 5581 t-W. G, Melvston, til

.i Sonnor Vice Presloont Nuclear Operations Alabamalbwer 11 arch 27,1990 rtesourgeggm Docket Nos. 50-348 50-364 U. S. Nuclear Regulatory Commission ATTN Document Control Desk Vashington, D. C. 20555 Gentlemen Joseph M. Farley Nuclear Plant m Annual Diesel Generator Reliability Data Report Attached is the Annual Diesel Generator Reliability Data Report which is submitted in accordance with Technical Specification 6.9.1.12. This report provides the number of tests (valid or invalid) and the number of failures for each diesel generator at Farley Nuclear Plant for 1989. Also provided is the information identified in Regulatory Position C.3.b of Regulatory Guide 1.108, Revision 1, 1977 for each failure.

Respectfully submitted,

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. + airs on, III VGil,III/JARimgd 17.04 Attachment cc Mr. S. D. Ebneter Mr. E. A. Reeves Mr. G. F. Maxwell l

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L ANNUAL DIESEL GENERATOR' RELIABILITY DATA REPORT FOR 1989 )

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i This diesel generator (DG) reliability report for the year 1989 is i r

submitted in accordance with Technical Specification 6.9.1.12. The table g

.belov shows the number of tests (valid or invalid) and the number of i failures for each of the five DGs at Farley Nuclear Plant.

TABLE Diesel Generator 1-2A IB 2B 10 2C TOTAL i

Valid Successful 47 53 48 47 41 231 Tests Invalid Tests 22 20 22 21 14 99 Valid Failures 1 1 1 0 0 3 l

I Invalid Failures 0 0 0 0 0 .0 The following paragraphs provide the information required by Regulatory l Position C.3.b of Regulatory Guide 1.108, Revision 1, 1977 for the valid failures identified above.

1-2A DG Failure on 03-08-89 At 0658 on 03-08-89, while an operability test was being performed on the 1-2A i DG, the rocker arm lubricating oil low pressure alarm came in. The rocker arm oil filters were swapped but the alarm did not clear; therefore, the DG was shut down manually. It was found that the filter swapped to was already clogged, having been in service previously. The dirty filter had been left in '

place due to personnel error. The rocker arm lubricating oil filters were replaced. The DG operated properly during subsequent testing and was returned to service at'2100 on 03-08-89.

This was the first failure in the last 100 starts for this type of DG. No change in the surveillance schedule was necessary. The surveillance schedule remained at 14 days in accordance with Technical Specifications.

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E Annual Diesel Generator Reliability Report f Page 2 j

1 1B DG Failure on 08-04-89 j i

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At 0034 on 08-04-89, the IB DG was started to perform an operability test following maintenance on the diesel. At approximately 0142 the DG load began oscillating, and load svings as large as 1.5 megawatts were noted. j Oscillations were also noted in the fuel oil pressure. The DG vas shut down  !

manually. The fuel oil filters were replaced. The internal relief valve on the fuel pump was inspected and found to be satisfactory. The DG operated properly during subsequent testing and was returned to service at 0010 on i 08-05-89. No cause for the load svings was determined. No subsequent load  ;

svings have been observed to date. l This was the second failure in the last 100 starts for this type of DG. No  !

change in the surveillance schedule was necessary. The surveillance schedule  !

remained at 14 days in accordance with Technical Specifications.

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2B DG Failure on 08-06-89 i

.i At 1550 on 08-06-89, the 2B DG was started in order to perform an operability [

test. Approximately 15 seconds after starting, the DG tripped because of lov lubricating oil pressure. A second attempted start was performed subsequently -

and the DG tripped again on lov lubricating cil pressure. Following these ,

trips, the 18 month-inspection was performed on the diesel. ,

It was found that the foot valve strainer in the fuel oil day tank vas '

partially clogged with lint-like material which was subsequently identified as '

rayon fibers. The source of the fibers was unable to be determined. It is believed that the clogged strainer caused a slowed start which allowed the low lubricating oil pressure trip to be enabled before the oil pressure increased r above the trip setpoint.

The foot valve strainer was cleaned. The DG operated properly during  ;

subsequent testing and was returned to service at 0235 on 08-07-89. A I L

quarterly inspection of the DG foot valve strainers in the fuel oil day tanks was incorporated into the preventive maintenance (PH) program. This PM has l been performed on all DGs since the event. Subsequent inspections have found l l only very small amounts of the fibers in the strainers. These inspections are continuing to be performed. ,

This was the third failure in the last 100 starts for this type of DG.

Technical Specifications require that the surveillance interval be changed to seven days when three or more failures have occurred in the last 100 starts for a particular type of DG. Therefore, the surveillance interval was changed to seven days. On 10-28-89, DG surveillance was returned to 14 days when the number of failures in the last 100 starts decreased to two.

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