ML19319B372
| ML19319B372 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 10/27/1977 |
| From: | Roe L TOLEDO EDISON CO. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| 395, NUDOCS 8001150954 | |
| Download: ML19319B372 (5) | |
Text
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Mr. John F. Stolz Toledo, Ohio
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DISTRIBUTION OF MATERIAL CONCERNING ONSITE EMERGENCY POWER SYSTEMS i
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October 27, 1977 (4191 259 *242 Serial No. 395
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j Director of Nuclear Reactor Regulation
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Attn: Mr. John F. Stolz, Chief I
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Division of Project Management 9
3 United States Nuclear Regulatory Commission
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Dear Mr. Stol:
j leS Your letter of September 2, 197~/ & couested information concerning the possibility of diesel generator lockout
't the Davis-Besse Nuclear Power Station Unit No. 1.
The following are our responses to the info rmation requested in that letter:
Item (a) All conditions that render the diesel generator incapable of responding to an automatic emergency start signal as discussed in the letter referenced above Response: The following is a list of conditions that render the Diesel Generator incapable of responding to an automatic emergency start signal:
1.
Diesel generator has been tripped due to trouble and operator has failed to reset the lockout relay.
2.
Voltage Regulator Switch in the off position.
3.
Fuses blown in control circuits.
4.
Starting air pressure less than 91 psig in both air receiver tanks.
5.
No fuel oil in Day Tank.
6.
Station Battery voltage at distribution panel less than 90V.
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THE TCLECO EDISCN COMPANY ECISCN PLAZA 300 MACISON AVENUE TCLECO. CHO 43652
7.
No lobe oil in engine sump-alarm actuated at less than 84 gal.
8.
High Crankcase Pressure Switch not reset.
9.
Overspeed Trip Switch not reset.
10.
Generator Differential Lockout Relay not reset.
11.
Lube oil pressure less than 10 psig.
12.
Jacket water temperature less than 110 F.
13.
Speed setpoint on engine governor adjusted wrong.
14.
Voltage setpoint on generator voltage regulator adjusted wrong.
Conditions numbered 11 and 12 do not prohibit Diesel Generator starting but could extend the Diesel Generator starting time beyond the required 10 seconds.
Item (b) The wording on the annunicator window in the Control Room that is alarmed for each of the conditions identified in (a)
Response: Conditions numbered 1 and 10 of item (a) are alarmed at annun-ciator window Q396 (Q401) which reads: "EMER DG 1 (2) TREL TRIP".
Af ter the "EMER DG 1 (2) TRBL TRIP" window is alarmed in the Control Room, the operator can go to the Diesel Generator where each Diesel Generator has its own set of local annun-ciator windows and protective relay targets to identify the exact cause of the alarm.
Conditions numbered 1, 2, 3, 7, 8, 9, 11 and 12 of item (a) are alarmed at window Q395 (Q400) which reads: "EMER DG 1 (2)
TRBL".
Af ter the "EMER DG 1 (2) TRBL" window is alarmed in the Control Room, the operator can go to the Diesel Generator where each Diesel Generator has its own set of local annunicator windows and protective relay targets to identify the exact cause of the alarm.
Condition number 4 of item (a) is alarmed at window P390 (P392) when pressure goes below 190 psig and reads:
"EMER DG 1 (2) AIR REC PRESS LO".
Condition number 5 of item (a) is alarmed at window L391 (L393) when level goes below 6'-6" and reads: "~?iER DG DAY TANK 1 (2) LVL LO".
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- Condition number 6 of item (a) is alarmed at window E083 when voltage goes below 116 V and reads "DC BUS D1 or D2 VOLTAGE LO".
When "DC BUS D1 or D2 VOLTAGE LO" window alarms in the Control Room the plant computer will alarm and print out which of four DC distribution busses has low voltage.
Conditions 13 and 14 are not alarmed in the Con' trol Room.
See response to Item (d).
Each Diesel Generator system has its own set of alarm windows in the Control Room. The window numbers and engravings shown in parentheses are for the corresponding alarm windows for the second Diesel Generator.
Item (c) Any other alarm signals that also cause the same annunciator to alarm Response: Annunciator window Q395 (Q400) (EMER DG 1 (2) TRBL) will also alarm for the following conditions not listed in Item (a):
1.
Diesel Generator fails to start.
2.
Diesel Generator fails to reach rated speed or voltage.
3.
Fuel Oil system pressure low.
4.
Exciter PT or PT fuse failure.
5.
Exciter diode failure.
6.
Starting Air Compressors locked out or overload.
7.
Diesel Generator room temperature high.
8.
Diesel Generator combustion air intake pressure low.
9.
Diesel Generator combustion air exhaust pressure high.
10.
High jacket water temperature.
11.
Generator protective relaying actuati'on.
Annunicator window Q396 (Q401) (EMER DG 1 (2) TRBL TRIP) will also alarm for the following condition not listed in Item (a):
Generator protective relaying actuation other than differ-ential relay. Actuation of these protective relays does not render the Diesel Generator incapable of responding to an automatic emergency start signal.
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l 4-Each of the Diesel Generators has its own local annunicator windows for each of the conditions listed in (c) except " Diesel Generator room temperature high" for which there is no local i
alarm.
Item (d) Any condition that renders the diesel generator incapable of i
responding to an automatic emergency start signal which is not j
alarmed in the Control Room i
Response: The setpoints for the engine governor and the generator voltage regulator are determined by a motor operated potentiometer j
i which is controlled by a " Lower-Raise" switch in the Control l
Room and in the Diesel Generator Room. There is no alarm to indicate that the potentiometer setting is not at the position i
corresponding to 4160V or 60 HZ.
However, Toledo Edison Admin-i istrative Controls dictate that the speed and voltage be confirmed before shutdown and furthermore that the Diesel Generator must be restarted following an emergency shutdown and run at rated speed and voltage before being declared operable. In addition, the speed and voltage adjustment is not operable unless the engine is running, which prevents any change prior to engine start initiation.
Item (e) Any proposed modifications resulting from this evaluation Response: We intend to add a local alarm for high temperature in the Diesel Generator Room as discussed in item (c).
Very truly yours.
l Lowell E. Roe, Vice President Facilities Development wp b/1-4 f
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