ML17173B004
| ML17173B004 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 07/25/1979 |
| From: | Janecek R COMMONWEALTH EDISON CO. |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| TASK-08-03.B, TASK-8-3.B, TASK-RR NUDOCS 7908010445 | |
| Download: ML17173B004 (3) | |
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Commonwee Edison One First National Plaza, Chicago, Illinois Address Reply to: Post Office Box 767 Chicago, Illinois 60690 July 25, 1979 Mr. D. L. Ziemann, Chief Operating Reactors - Branch 2
! REGULATORY DO&K[1f f~lE COPY Division of Operating Reactors U.S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Dresden Station Units 1 and 2 Systematic Evaluation Program Topic VIII-3.B NRC Docket Nos. 50-10/237 Reference (a) :
D. L. Ziemann letter to c. Reed dated June 18, 1979
Dear Mr. Ziemann:
Reference (a) re*quested additional information for Dresden Station Units 1 and 2 concerning Topic VIII-3.B pertaining to on-site D.C. battery systems.
The information you requested is provided in the attachment to this letter.
Please address any additional questions concerning this matter to this office.
attachment 7908010'{'{.:>
Very truly yours, r:P~r~
Robert F. Janecek Nuclear Licensing Administrator Boiling Water Reactors Ao~5 1
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Commonwealth Edison e NRC Docket Nos. 50-10/237 ATTACHMENT Unit 1 - Dresden I.
Information available in control room.
A.
125 Volt DC system (trouble) alarm on Panel 13, which provides alarm of DC ground.
II.
Information available in charger room A..
One Voltmeter present (with a selector switch that can be turned to read voltage on each charger and total battery voltage.)
B.
One Ampmeter present on each of the 2.chargers.
C.
Ground detection alarm, this alarm has two lights which gives the magnitude of the ground by the intensity of lights, and relays the alarm to control room.
Unit 2 - Dresden IV.
Information available in control room for 250 volt DC system.
A.
Present,. on Panel No. 902-8: are the following alarms:
- 1.
250V Battery Charger 2 Trip
- 2.
250V Battery Charger 2/3 Trip
- 3.
250V Rx Building Bus Feed ACB Trip
- 4.
250V Battery 2 Ground
- 5.
250V Turbine Building Bus Feed ACB Trip V.
250 Volt information available in charger room.
A.
Ampmeter present on each of the 2 chargers.
B.
Voltmeter present on each of the 2 chargers.
C.
Ground Detection Alarm
. i Commonwealth Edison NR~Docket Nos. 50-10/237 2 -
VI.
Information available in control room for 125 DC System.
A.
Present, on Panel No. 902-8 are the following alarms:
- 1.
125V Battery Charger 2 Trip
- 2.
125V Battery-Charger Charger 2A Trip
- 3.
125V Battery 2 Ground
- 4.
125V Rx Building Bus Feed ACB Trip 5~ - 125V Turbine Building Bus Feed ACB Trip VII.
125 Volt information: available in charger and battery room.
A.
Ampmeter present on each o-f the 2 chargers, B.
Voltmeter -present on each of the 2 chargers.
C-. -- Grounc;l-Detection: Alarm present~
VIII.
Information available in control room for 48/24 Volt DC System.
A.
Present on Panel No. 902-5 are the following alarms:
- 1.
48/24 Battery Charger 2A AC/DC Ckt. Fail
- 2.
48/24V Battery Charg.er 2B AC/DC Ckt. Fail
-3..
- 48/24V Neutron Monitor for A Sply Hi/Lo Voltage,
- 4.
4S/24V Neutron Monitor for B Sply Hi/Lo Voltage IX.
48/24 Volt information available in charger room.
A.
Voltmeter present on each of the 4 chargers.
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