ML20245C305

Requests That Util Review Alarm Circuitry & Diesel Generator Control Circuitry for Diesel Generators at Plant.Response to Request Should Be Submitted within 45 Days of Ltr Receipt

ML20245C305
Person / Time
Site:	Beaver Valley
Issue date:	03/28/1977
From:	Reid R Office of Nuclear Reactor Regulation
To:	Dunn C DUQUESNE LIGHT CO.
References
TAC-1228, NUDOCS 8710220114
Download: ML20245C305 (3)

Text

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.. og a joO # .e .j utdTED STATES  %/

p !g NUCLEAP ff AGULATORY COMMISSION g WASHINGTON, D. C. 205S5 \

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'%, V...../~ March 28,1977 Docket No.: 50-334 Duquesne Light Company -

ATTN: Mr. C. N. Dunn, Vice President Operations Division 435 Sixth Avenue Pittsburgh, Pennsylvania 15219 Gentlemen:

i RE: BEAVER VALLEY UNIT NO.1 In our review of reports submitted by licensees concerning malfunctions of diesel generators, we find that in some cases the information available to the control room operator to indicate the operational status of the diesel generator may be imprecise and could lead to misinterpretation.

This can be caused by the sharing of a single annunciator station by alarms that indicate conditions that render a diesel generator unable

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to respond to an automatic emergency start signal and alarms that only t indicate a warning of abnomal, but not disabling, conditions. Another '

cause on 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 automatic emergency start signal) when in fact it is inoperable for that purpose.

We, therefore, request that you review the alarm 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 automatic emergency start signal is alarmed in the control room. These conditions include not only the trips that lock out the diesel generator start and require manual reset, but also control switch or mode switch positions that block automatic start, loss of control voltage, insufficient starting air pressure or battery voltage, etc. This review should consider all aspects of possible diesel generator operational conditions, for example test conditions and opera +. ion from local control stations. One area of particular concern is the unreset condition following a manual stop at the local station which teminates a diesel generator test prior to resetting the diesel generator controls for enabling subsequent automatic operation.

j Please respond within 45 days of your receipt of this letter by providing the following information:

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8710220114 770318 DR ADOCK 05000334 (.

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. Duquesne Light Company '

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8 (a) all conditions that render the diesel generator incapable of '

responding to an automatic emergency start signal as discussed

• above;  !

(b) the wording on the annunicator window in the control room. that ,

is alarmed for each of the conditions identified in (a);

(c) any other alarm' signals that also cause the same'annunicator to alarm; (d) any condition that renders the diesel generator incapable of-  !

responding to an automatic emergency start signal which is not  ;

alarmed in the control room; and 5 l

i (e) ' any proposed modifications resulting from this evaluation.

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.. Sincerely, Db h  ;

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Robert W. Reid, Chief l

, I. Operating Reactors Branch #4 Division of Operating Reactors cc: See next page

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,e j Duquesne Light Company '

cc: Gerald Charnoff, Esq. Mr. Jack Carey Jay E. Silberg, Esq. Technical Assistant -

Shaw, Pittman, Potts & Trowbridge Duquesne Light Company.

910 17th Street, H.W. P. O. Box 4 Wa shingto,n, D.C. 20006 Shippingport, Pennsylvania

/ 15077 Karin Carter, Esq. '

Special Assistant Attorney General Bureau of Administrative Enforcement

, 5th Floor, Executive House s

Harrisburg, Pennsylvania 17120 -

Joseph A. Fricker, Jr.

Utility Counsel City of Pittsburgh ,

313 City-County Building Pittsburgh, Pennsylvania 15219 Mr. J. M. Cumiskey Stone & Webster Engineering Cor P. O.poration Box 2325 Boston, Massachusetts 02107 y

' Mr. R. Stokes Westinghouse Electric Corporation P. O. Box 355 Pittsburgh, Pennsylvania 15230 Beaver Area Memorial Library 100 College Avenue Beaver, Pennsylvania 15009

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