ML18219D946

Response to Request for Additional Information Diesel Generator Alarm and Control Circuitry Which Annunciate Inoperability Conditions to the Control Room Operator

ML18219D946
Person / Time
Site:	Cook
Issue date:	05/27/1977
From:	Tillinghast J Indiana Michigan Power Co, (Formerly Indiana & Michigan Power Co)
To:	Case E Office of Nuclear Reactor Regulation
References
Download: ML18219D946 (14)

Text

U.S. NUCLL'aR Rr, C ULaTOHV COMMISSION FROM; Indiana

& Michigan Pwr Company New York, N.

Yo John Tillinghast T0:

Mr. Edson GN gase NRC soriM 495 P T'AI

'RC DISTRIBUTION'Fort T 50 DOCKET MATERIAL

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II rECKNOWLFDGED DISTRIBUTD)N OF MATERIAL CONCERNING DIESEL ALARM CIRCUITRY FOR DKESEL GENERATORS.

ENCLOSUAE I

Consists. of requested information on diesel. generat'or alarm and control

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. Circuitry.:which annunciate inoperabili".ty.

'onditions t'o the control room operatoro

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INDIANA IL MICHIGAN POWER COMPANY P, O. BOX 18 BOWLING GREEN STATION N E W YOR K, N. Y. 10004 May 27, 1977 Donald C. Cook Nuclear Plant Unit Nos.

162 Docket Nos.

50-315 and 50-316 DPR No.

58 and.

CPPR No. 61 l

Mr. Edson G. Case, Acting Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission

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"Washing ton, D.C.

20555

Dear Mr. Case:

KIRkll'(llEI.5)<I(E [III.NIPg This letter is in response to Mr. Don K. Davis'etter of April 7, 1977, which was received April 12, 1977, requesting information on diesel generator alarm and control circuitry which annunciate inoperability conditions to the control room operator.

The lettered paragraphs below correspond to the lettered items of information requested in Mr. Davis'etter.

(a)

The conditions which render the diesel generator incapable of responding to an automatic emergency start signal are classified into three categories and are detailed in the enclosed attachments.

The three categories are as follows:

Attachment X Alarms Indicating Inoperability Attachment II Alarms Xndicating Inoperability Easily Rectifiable by Corrective Action Attachment IIX Alarms Xndicating Inoperability after Diesel Generator Operation On these attachments, the condition which causes an alarm follows each annunciator description.

Xn addition, there are no alarms which only indicate a "warning of abnormal, but not disabling, conditions."

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'r. Edson G. Case May 7,

1977 (b)

The exact wording on the annunciator window in the control room is designated by the underlined part. of each annunciator on the attachments of (a) with the exception that train designations (which diesel generators AB or CD) are shown on the annunciator windows but are left off the attachments for clarity.

(c)

The alarms indicated are not shared with any other alarm signals that also cause the same annunciator to alarm.r (d)

The only condition which is not alarmed and which could render the diesel generator incapable of responding to an automatic emergency start signal is the opening of certain knife switches in the diesel generator control circuitry located in the control room.

These switches remain in the closed position except for periodic surveillance testing of diesel engines or sequence timing.

A protective cover for these switches cannot be installed unless the switches are in the closed position.

This cover is made of glass and is located on the front of the diesel generator operating panel which is in full view of the operators to sufficiently safeguard against, these switches being left in an open position.

(e)

No proposed modifications have resulted from the evaluations of the diesel generator alarm and control circuitry.

Very truly yours, JT:mam Attachments Jo llin hast ice President Sworn and subscribed to before me on the

~7 day of May, 1977 in New York County, New York Notary Public cc:

see next page

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W. Steketee R. Walsh G. Charnoff R. J. Vollen R. S. Hunter R.

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Alarms Indicating Inoperability k

1.

D.G-Control Bus Volta e Failure - Mill cause the "6" relays to drop out as if a D-G-start, but will not start engine as there is no voltage to the fuel and st arting'ir soleno ids.

. 2.

D.G-=-Air Com Receiver Press L'ow There

'are two receivers per diesel.

The alarm set point is 200 psi.

A successful start can -be= obtained with one receiver at 170 psi.

There is no indication in the control room of this pressure, therefore'e will assume that upon an alarm condition, our pressure. is down to "0" psi and we are unable to start.

3.

D-G. 100 si Sup 1

Air Pressure Low - Alarm point,set

't 90 psi.

Operation of the diesels is -good to approximately.

80 psi.

Below this -operation of the

-'ctuators is dubious.

Me will again assume

"'0" pressure and inoperability of the diesels.

.4.

D.G. Fuel Oil Da Tank -Level Low - Alarm point is set at 99'-3 'hich corresponds

-to approximately 15 minutes of operation, again we will assume "0" minutes of operation and inoperability.

5.

CO Fire System D-G. Trip - Operates the D.G.

HEA, locking out the diesel completely.

6.

Diesel Gen Diff Operated

.Can be operated at engine standstill by emergency trip pushbutton.

Also classified under Category III.

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ATTACHMENT II II.

Alarms Indicating Inoperability Easily Rectifiable By Corrective Action 1.

D-G. Volta e Re in Manual - If left in this position, diesel gen will not build up to proper voltage level in specified time.

Alternative is to place switch in "Auto" position.

2.

D-G. Inverter Fai'lure - Alarm indicates no voltage to " "

-=D.G. electric governor.

Alternative is manual throwove'r which gets power from generator PT's.

3 0 D.G.

Gen ACB Locked Out - This indicates the position of'he ACB control switches.

Both control switches are.in parallel on one alarm.-- Alternative is to take switch(s)-

out of lockout position.

D.G. Control S'W Status Incom lete - Will alarm when, the, following switches are not in the automatic mode:

Vent

, fans and auto dampers, crank case breather centrifugal ---- -- ----

blower, aux. jacket water pump (not in run),

aux. jacket water heater, air intake filter-heater and drive, by 'pass lube oil filter heater, by-pass lube oil-.filter pimp'-

-'not in run'),

one of twomo jacket water pumps, one of two starting air compressors, lube oil before and after pump, lube oil heater pump, lube oil circulating heater, voltage failure to air filter drive, one of two F-O.

transfer pump.

Alternative is to place the switch in.

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the correct position required by the proper operating mode.

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ATTACIIHEHT III III. Alarms Indicating Inoperability After Diesel Generator operation 1

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D.G. Incom lete Start - Caused by diesel not reaching 9

speed 10 seconds after, a start-"signal..'- Must--be="

'anually reset.

If not-reset,--.will--lockout-engine-" ---

from starting.

. 2.

D.G'.

4 kVA ACB - Overload=-'Trio-Mus't"'-be.; manually.'eset.'

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,Xf not reset, will lockout breaker and lockout engine from.

star ting.

. 3.

Diesel Gen Diff 0 crated - Caused by engine overspeed, extreme low fuel oil-pressure,--extreme low lube o'il

pressure, air'hest press 'extreiiie high plus electrical trips.

Yiust be manually reset.

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