ML20236R048

Requests Review of Alarm Circuitry & Diesel Generator Control Circuitry for Diesel Generators.Response Requested Per Listed Criteria within 45 Days of Ltr Receipt

ML20236R048
Person / Time
Site:	Farley
Issue date:	10/31/1977
From:	Stolz J Office of Nuclear Reactor Regulation
To:	Barton A ALABAMA POWER CO.
References
TAC-1228C, NUDOCS 8711230050
Download: ML20236R048 (2)

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. ' Distribution

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• Docket Files o IE (3) c e 4 NRC PDR D. Crutchfield,-

Local PDR V. Stello LWR 1 File K. Goller '2 OCT 31 W77 R. S. Boyd D.Davisj/ f R. C. DeYoung F. J. Williams E. Reeves W. Haass mV, p/0 ll J. Stolz Docket Nos. 50-348 R. Martin bec: JRBuchanan, NSIC and 50-364 E. Hylton TBAbernath R. J. Mattson ACRS (16) y, TIC D. Ross Alabama Power Ccrapany J. P. Knight

} ATIN: Mr. Alan R. Barton R. Tedesco J Senior Vice President H. Denton 600 North 18th Street V. A. Moore Birmingham, Alabama 35291 R. H. Vollmer M. L. Ernst Gentlemen: W. P. Gammill ELD 5

SJ32fI2: DIESEI, GmETMCR CPDATING 5LHUS INDICL"ICU JCSEPH M. FAMZY NGCIIAR PLANT GNIT 1 MD 2 In our review of reports subnitted by licensees concerning malfunctions of diesel generators, we find tnat in some cases the information availacle to the contral roco operator to irxlicate the operational status of the diesel generator =ay te inerecise and could lead to misinterpretation. '

This can be caused by the sharing of a single annunciator station by alarms that indicate corditions that render a diesel generator unanle to' respond to an automatic emergency start signal anri alarms that only indicate a warning of abnormal, but not disabling, conditions. Another.'

cause can te the use of wordirs on an annunciator window that does not specifically say that a diesel generator in inoperable (i.e., unacle s at the time to respcod to an automatic emergency start signal) wnen in i fact it is inoperacle .for that purpose. .l de, therefore, request that yco review tne alarm circuitry and diecel I.

generator control circuitry for the diesel generators at your facility ,

to determine how each ecodition that renders a diesel generator unable to respond to an sutomatic emergency start signal is alarmed in tne control roca. These corditions include not only the trips that lock ..,

out tne diesel generatDr start and reqJire manual reset, but also i centrol switch or made switen ;mitions that block autcmatic start,. s less of control voltage, insufficient starting air pressure of battery voltage, etc. This review should consider all aspects of possible diesel generator cgerational condit1cns, for example test conditions am! cperaticn fram local control stations. One area of particular concern is the unreset condition followirq a manual stop at the local station which terminates a diesel generster test prior to resetting the diesel generator controls for enacling succequent automatic operation.

Please respond within 45 days of your receipt of this letter by

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eroviding tne following information i i e ric =

• 8711230050 771031 _

PDR ADOCK 05000348

.u...-.* P PDR _

am * . l . l .. . .. ...

NRC TORM 310 (946) NRCM 0240 "A us e. oovsmanam .nemme ormese teve - ene.esa

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gim power ccznpany OCT 31 1977 (a) all conditions that render the diesel generator incapable of respcoding to an automatic esergency start signal as discussed aDove; (b) the wording on the annunicator window in the control room that is alarned for each of the cecx51tiora identified in (a);

} (c) any other alarm signals that also cause the saw annunicator to alarm;

.(d) any conditicri that renders the diesel generator incapable of .

responding to an autocatic erergency start signal which is not alarmed in the control room; and

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(e) any proposed :: modifications resulting from this evaluation.

Sincerely, Origical Slgued by,'

d # r." feelz, chief Light Water Reactors Branch No.1 Division of Project Managenoent cct George F. Trewbridge, TJg.

Shaw, Pittman, Potts & Trowbridge 1800 M Street, N. W.

Wasnington, D. C. 2003G Mr. auble A. Thomas Vice President Southern Ccmpany Services P. O. Ecx 2625 ,'

Birmingham, Alamma 35202

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