ML20205B047

Forwards Rev 1 to Annual Diesel Generator Reliability Data Rept for 1986 Re Invalid Failures

ML20205B047
Person / Time
Site:	Farley
Issue date:	10/19/1988
From:	Hairston W ALABAMA POWER CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
NUDOCS 8810260171
Download: ML20205B047 (2)

Text

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t e ag Alsbar:.a Power Company 600 North 18th Street hst OfIee Box 2641 i

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t.,4ingham, Alabarna 35291440o 7

ToleSSone 205250a837 W.O Maltston,Ill se,s. Vice President Nuclear Operates AlabamalDWCf October 19, 1988 the southern ekttrc systern J

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t Docket Nos. 50-348 50-364 l

U. S. Nuclear Repilatory Commission ATTN: Document C.;nt 4 Desk Vashington, D.C.

2C U Gentlemen:

Joseph H. Far y Nuclear Plant - Units 1 and 2 Revision 1 to the Annual Diesel Generator Reliability Data Report for 1986 l

1 By letter of July 6,1987 the Annual Diesel Generator Reliability Data Report for 1986 was submitted in accordance with Technical Specification 6.9.1.12.

This report pre"ided ths number o'. tests (valid or invalid) i and the number of f ailures for esch diesel generator at Far1r:y Nuciear r

Plant for 1986.

Also provided was the information identified in Ragulatory Pesition C.3.b of Regulatory Guide 1.108. Revision 1, 1977 1

for each failure. During an inspection of November 2-6, 1987, the NRC stated that both valid and invalid emergency diesel generator tests and f-\\ lures should be included in test data logs.

Attached is Revision 1 i

L the Annual Diesel Generator Reliability Report for 1986 in which the information pertaining to invalid failures is provided.

l Respectfully submitted, 1

k.k.r

^A " #

V. G. Hairr, ton, III VGH,III/ JAR: dst-V8.9 Attachment cci Mr. L. B. Long Dr. J. N. Grace Mr. E. A. Reeves Mr. G. F. Maxwell JO W260171 881019 d006 480 0 ADOCK 0500034e R

Pm ll [

.s ANNUAL DIESEL GENERATOR RELIABILITY DATA REPORT FOR 1986 This diesel generator (DG) reliability report for the year 1986 is submitted in accordance with Technical Specification 6.9.1.12.

Table 1 shows the number of tests (valid or invalid) and the number of failures for each of the five DGs at Farley Nuclear Plant.

TABLE 1 Diesel Generator 1-2A 1B 2B 1C 2C TOTAL Valid successful 35 33 35 34 30 169 Tests Invalid Tests 20 21 23 21 19 103 l

Valid Failures 0

0 0

0 1

1 Invalid Failures 0

0 0

0 0

0 The following paragraph provides the information identified in Regulatory Position C.3.b of Regulatory Guide 1.108. Revision 1, 1977 for the valid l

failure identified above.

2C DG Failure on 5-12-86 l

t At 1350 on 5-12-86, the 2C DG.as started to perform an operability test.

Upon starting, the plant operator noticed that no frequency or voltage was indicated.

However, speed indication and DG status lights functioned correctly. The control power fuses and control circuits vere check-d and no problem vas found.

The DG vas restarted and it tripped due to overspeed. No cause for the trip was discovered. The overspeed trip switch was reset. The field flashing circuit was checked and the K1 field flashing relay was manually operated. The DG vas restarted and proper Indications were received locally and on the eaergency power board. The DG t

va-returned to service at 1955 on 5-12-86.

The K1 relay was checked again late. in the shift and was verified to be operating properly. No correlation between the overspeed trip and loss of indication could be found.

This was the first failure in the last 100 starts for this type of DG, Na change in the surveillance schedule was necessary. The surveillance interval remaine' at fourteen days in accordance with Technical Specification Table 4.8.1.

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