ML20205A830
| ML20205A830 | |
| Person / Time | |
|---|---|
| Site: | La Crosse File:Dairyland Power Cooperative icon.png |
| Issue date: | 07/29/1986 |
| From: | Taylor J DAIRYLAND POWER COOPERATIVE |
| To: | Zwolinski J Office of Nuclear Reactor Regulation |
| References | |
| LAC-11749, NUDOCS 8608110457 | |
| Download: ML20205A830 (4) | |
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17f>[QlR1dl)4 AIL >[M[ COOPERATIVE
- P O BO (608) 788-4000 JAMES W. TAYLOR G:neral Manager July 29, 1986 In response, please refer to LAC 11749 Docket No. 50-409 Mr. John A.
Zwolinski, Director BWR Project Directorate #1 Division of Licensing U.S.
Nuclear Regulatory Commission Washington, D.C.
20555
SUBJECT:
DAIRYLAND POWER COOPERATIVE LA CROSSE BOILING WATER REACTOR (LACBWR)
PROVISIONAL OPERATING LICENSE NO. DPR-45 REVISION TO TECHNICAL SPECIFICATION BASES REF:
(1) DPC Letter, Taylor to Zwolinski, LAC 11430, Dated February 21, 1986 Gentlemen:
Please substitute the enclosed Electrical Power Systems Bases for the bases previously proposed in Reference 1.
This revision incorporates a minor change to the discussion of the 1A Static Inverter.
Dairyland Power Cooperative plans to replace the existing 1A Static Inverter with an upgraded inverter, which has a static transfer switch instead of an electro-mechanical transfer switch.
Therefore, the word " electro-mechanical" needs to be removed from the transfer switch description.
DPC will be performing an internal 50.59 review of the inverter replacement.
If there are any questions, please contact us.
Sincerely, JWT/LSG/ lam
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Enclosure 1
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Mr. John A. Zwolinski, Chief July 29, 1986 Page Two cc:
J.G. Keppler, Regional Administrator John Stang, LACBWR Project Manager NRC Resident Inspector Mr. L.L. Smith Wisconsin Public Service Commission P.O. Box 7854 Madison, WI 53707 STATE OF WISCONSIN )
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COUNTY OF LA CROSSE )
e me this / M day of
, 1986, the gs allg f}
M o me known to be the person wp executed the abo nam
,J foregoing instY.ument and acknowledged the same.
Wf' Notary Puby'c, La Crosse County Wisconsin My commission expires February 21, 1986.
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BASES 4.2.3 ELECTRICAL POWER SYSTEMS The OPERABILITY of the normal and backup electrical power systems ensures that sufficient power will be available to supply necesary plant equipment during normal operation and following a loss of offsite power event.
For normal operation, all power for reactor and turbine auxiliary equipment is supplied by the main generator through the unit auxiliary transformer or the reserve auxiliary transformer. During startup or shutdown, or in the event of failure of power from the unit auxiliary transformer, power is supplied by a connection to the external grid via the reserve auxiliary transformer.
The onsite power distribution system is divided between two independent 2400 volt buses, and each component of duplicated equipment is supplied by a different bus. The duplicated equipment includes the primary system forced circulation pumps, the reactor feedwater pumps, the condensate pumps, and the condenser circulating water pumps. Each 2400 volt bus also supplies power to a 480 volt bus. If the supply to either 480 volt bus fails, a connection may be manually made'from the other 480 volt bus using a control switch in the control room. Duplicate equipment is also supplied by the 480 volt buses.
Each 480 volt bus normally supplies power to its associated essential bus.
The 480 volt Bus lA supplies the 480 volt Essential Switchgear Bus lA.
The 480 volt Essential Switchgear Bus lA supplies high pressure core spray pump 1A and Turbine Building Motor Control center lA which supplies the Turbine Building 120 volt Bus which in turn supplies the Turbine Building 120 volt Regulated Bus. Diesel Generator lA serves as the backup power supply for the 480 volt Essential Switchgear Bus lA.
Turbine Building Motor Control Center lA supplies power for the Reactor Plant Battery Charger. The Reactor Plant Battery Charger carries the load and charges the batteries on the Reactor Plant 125 volt DC Bus. The Reactor Plant 125 volt DC Bus normally supplies power for Static Inverter lA which supplies power to essential reactor instrumentation and control circuits connected to 120 volt AC Non-Interruptible Bus lA.
In case of Static Inverter 1A trouble, a transfer switch located in Static Inverter 1A automatically transfers to its alternate power supply which is Turbine Building 120 volt Regulated Bus.
The 480 volt Bus 1B supplies power to the 480 volt Turbine Building Motor Control Center ID.
Turbine Building Motor Control Center ID is the normal supply for the Generator Plant 125 volt DC Bus through the Generator Plant Battery Charger.
The Generator Plant 125 Volt DC Bus normally supplies power to a Generator Plant 125 Volt DC distribution panel which supplies power to essential reactor instrumentation and control circuits connected to 120 Volt AC'Non-Interruptible Bus IC.
The static switch of the Static Inverter 1C is capable of supplying power from Static Inverter 1C or its reserve 120 Volt AC power source.
In case of Static Inverter 1C trouble, the static switch will 32r(6)
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The Reactor Plant 125 Volt DC Bus is capable of providing power to the Generator Plant 125 Volt DC Bus through a normally open tie breaker.
The Diesel Building 480 volt Essential Switchgear Bus 1B supplies high pressure core spray pump 1B, seal injection pump 1B, Reactor Building Motor Control Center lA and Diesel Building 480 volt Motor Control Center. Diesel Generator 1B is the emergency power supply for the Diesel Building 480 volt Essential Switchgear Bus 1B.
The Diesel Building 480 volt Motor Control Center supplies power for the Diesel Building Battery Charger. The Diesel Building Battery Charger carries the load of and charges the batteries on the Diesel Building 125 volt DC Bus.
The Diesel Building 125 Volt DC Bus is the normal power supply for Static Inverter 1B which supplies power to essential reactor instrumentation and control circuits connected to 120 Volt AC Non-Interruptible Bus 1B.
In case of Static Inverter 1B trouble, its static switch can automatically transfer from the output of Static Inverter 1B to the output of its reserve transformer which is supplied by the Diesel Building 480 volt Motor Control Center. The Turbine Building 120 volt Regulated Bus is the reserve feed for the 120 Volt AC Non-Interruptible Bus 1B.
The normally open reserve tie breaker is administratively controlled as are other tie breakers.
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