ML19309B048

Requests Review of Alarm & Diesel Generator Circuitry to Determine How Each Condition That Prevents Generators from Responding to Automatic Emergency Start Signal Is Alarmed in Control Room

ML19309B048
Person / Time
Site:	Rancho Seco
Issue date:	03/28/1977
From:	Reid R Office of Nuclear Reactor Regulation
To:	Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT
References
NUDOCS 8004020522
Download: ML19309B048 (3)

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MAR 2 8-p77 NRC PBR

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Local PDR ORB #4 Rda.

EE Docket No. 50-312

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RWReid RIngram i= E5i L01shan

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Sacranento Municipal Utility District

.TWambach ATTt!: Mr. J. J. Mattinoe Attorney, OELD

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Assistant General Manager 0I&E--3

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and Chief Engineer DEise hut

1. f..J 6201 S Street TBAbernathy

.;;ll P. O. Box 15830 JRBuchanan Sacranento, California 95813 ACRS-16 s

Gray File Gentlemen:

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P ~. : RANCil0 SECO t1UCLEAR GENERATING STATIO!!

In our review of reports submitted by licensees concerning calfunctions

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of diesel generators, we find that in sone cases the infomation available i

to the control roor.1 operator to indicate the operational status of the M21 diesel generator may be Inprecise and could lead to nisinterpretation.

g.g. E This can be caused by the sharing of a sing;e annunciator station by-alams that indicate conditions that render a diesel generator unable to responc to an automatic emergency start signal and alams that only indicate a warning of abnormal, but not disabling, conditions. linother cause can be the use of wording on an annunicator window that does not specifically say that a diesel generator is inoperable (i.e., unable at the time to respond to an autonatic energency start signal) when in fact it is inoperable for that purpose.

We, therefore, request that you review the alam circuitry and diesel generator control circuitry for the diesel generators at your facility.

to determine how each condition that renders a diesel generator unable to respond to an autoaatic coergency start signal is alamed in the E:

control rom:.

These conditions include not only the trips that lock out the diesel cenerator start and require nanual reset, but also control switch or node switch positior.s that block autons. tic start, loss of control voltage, insufficient startine air pressure cr battery voltage, etc. This review shoulc consider all aspects of possible diesel cenerator nnerational conditions, for exanale test conditions and operation from local ' control stations. One area of narticular ccncern is the unreset condition following a nanual stop at the local = station uSich terminates a diesel generator test

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nrior to resetting the diesel generator controis for enabling 9

E sune.ecuent autonatic operation.

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Please resnond u QW f your receipt of this letter by

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(a) all conditions that render the diesel generator incapable of responding to an autonatic emergency start signal as discussed above;

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.(b) the wording on the atinunicator window in the control roon that

].[i is alarned for each of the conditions identified in (a);

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(c) any other alarm signals that also cause the same annunicator to alarn; (d) any condition tnat randers the diesel generator incanable cf responding to an autonatic emergency start signal which is not alarned in the control roon; and (e) any proposed nodifications resulting from this evaluation.

Sincerely, Original sigt.ed by Q,b -

i Robert W. Reid, Chief Operating Reactors Branch #84 Division of Operating Recctors cc:

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Sacramento Municipal Utility" District 77.;:-

cc: David S. Kaplan, Secretary and General Counsel 6201 S Street E+J Post Office Box 15830 EE Sacramento, California 95813

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Business and Municipal Department Sacramento City-County Library s

828 I Street Sacramento, California 95814 "1.."

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