ML19249B464
| ML19249B464 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck, Millstone File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 08/29/1979 |
| From: | Counsil W NORTHEAST NUCLEAR ENERGY CO. |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| TASK-08-03.B, TASK-8-3.B, TASK-RR NUDOCS 7909040429 | |
| Download: ML19249B464 (6) | |
Text
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0ARTFORD. CONNECTICUT 06101 (203) 666-6911 L
IJ August 29, 1979 Docket No s. 50-213 50-245 Director of Nuclear Reactor Regulation Attn:
Mr. D. L. Ziemann, Chief Operating Reactors Branch #2 U. S. Nuclear Regulatory Commission Washington, D. C.
20555
References:
(1)
D. L. Ziemann lets r to W.
- u. Counsil dated June 18, 1979, Docket No. 50-213.
(2)
D. L. Ziemann letter to W. G. Counsil dated June 18, 1979, Docket No. 50-245.
Gentlemen:
Haddam Neck Plant Millstone Nuclear Power Station, Unit No.1 SEP Topic VIII-3.B, DC Power System Bus Voltage Monitoring and Annunciation In References (1) and (2), Connecticut Yankee Atomic Power Company (CYAPCO) and Northeast Nuclear Energy Company (NNECO) respectively were requested to provide a listing of all alarms and voltage monitoring devices available for Class 1E direct current power systems to facilitate Staff review of SEP Topic VIII-3.B.
In response to References (1) and (2), Attachments (1) (Haddam Neck) and (2)
(Millstone Unit No.1) are provided.
As noted in previous discussions between the NRC Staff and NUSCO, we trust that the logistics of handling this SEP request are not indicative of future efforts and that subsequent topic reviews will be conducted in accordance with the SEP guidelines origf ally established.
Very truly yours, CONNECTICUT YANKEE ATOMIC POWER COMPANY NORTHEAST NUCLEAR ENERGY COMPANY
. JA/11 W'. G. Counsil ~
Vice President
- c. n..- y Attachments
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70090W
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DOCKET No. 50-213 ATTAC101ENT 1 ilADDAbi NECK PLANT c,
a s t f r. la t.,
,,3 AUGUST, 1979
HADDAM NECK PLAh"I DC POWER SYSTEM BUS VOLTAGE MONITORING AND ANNUNCIATION Control Room Annunciation (1) Low Voltage - A Battery, B Battery Indicates Bus voltage has dropped due to a problem with the batteries or charger.
(2)
Battery Charger Of f - Unit A, Unit B Actuated on a loss of AC voltage supply.
(3) Circuit Ground - D.C.
Bus lA, D.C. Bus 1B Actuated when a ground is sensed on the D.C. side of a battery c harger.
Control Room Monitoring (1) Voltage Meters for A and B batteries mounted on control board below annunc ia tor s.
Switchgear Room Monitoring The following information is available at each battery charger.
(1) Neutral to Ground Voltage (2) Charger D.C. Amps (3) Charger D.C. Volts (4)
Positive to Ground Voltage (5) Ground indicating lamp.
- st e u e.
DOCKET NO. 50-245 ATTACIDIENT 2 MILLSTONE NUCLEAR POWER STATION, UNIT NO. I c,;,,;-,,;
.,a..,,;.
AUGUST, 1979
MILLSTONE UNIT NO.1 DC POWER SYSTEI BUS VOLTAGE MONITORING AND ANNUNCIATION At Millstone Unit No. 1, therc are two (2) D.C. Supply Systems for station power consisting of 2 - 125VDC batteries and busses with three battery chargers. The third charger is a swing or alternate standby unit.
In addition, the neutron monitoring system is powered from two (2) D.C. Systems consisting of 4 - 24V batteries and chargers supplying 2 - 24 VDC busses.
125V D.C. System DC-i (1) Control Room Annunciators a.
Battery Charger Trouble Alarm b.
D.C.
System Ground Detection Alarm c.
Bus Voltmeter d.
Battery / Bus Undervoltage Alarm e.
Bus Parallel to DC-1A Alarm (2) Charger Monitoring Equipment Trouble Alarm monitoring lights for A.C. supply power failure a.
(three phases), High and Low D.C. output voltage and AC/DC internal
- failure, b.
Output Ammeter and Voltmeter Ground detection monitor light c.
(3)
D.C. Switchboard a.
Battery / Bus Ammeter and Voltmeter b.
Bus Undervoltage Relays c.
Bus parallel monitor light.
(4) Bus Ground Indication Panel a.
Positive and Negative ground voltmeters b.
Positive and Negative ground monitor lights 125V D.C.
System DC-1A (1) Control Room This system utilizes the alarms of DC-1.
(2) Charger Monitoring Equipment This charger is the same as DC-1.
(3)
D.C. Switchboard This board is the same as DC-1 less the bus parallel monitoring light.
- c. q q -
-c, s s o t-e m
(4) Bus Ground Indication Panel This system utilizes the equipment of DC-1.
125V D.C. Charger DC-llA (Standby-Charger)
(1) The control room is alarmed via the alare of DC-1.
(2) The charger monitoring devices are the same as those found on DC-1 and DC-1A.
24V D.C. Neutron Monitoring System lA and 1B (1) Control Room Annunciators a.
Battery / Charger lA Trouble Alarm b.
Battery / Charger 1B Trouble Alarm (2) Charger Monitoring Equipment a.
Low Voltage relays b.
Loss of Power (A.C.) relays c.
DC Ammeter and Voltmeter d.
AC/DC power monitor lights 24V D.C. Neutron Monitoring System 2A and 2B All equipment for this system is the same as lA and IB.
In addition, for the 125VDC systems, all the feeders to the D.C. Distribution Busses DC-llA-1, 2, and 3; the control room D.C. distribution panels; the 4KV A.C. Busses; the 480V Emergency Load Center Busses, and vital equipment are individually alarmed for loss of D.C. power in the control room.
Further alarming in the control room as well as local monitor lights are provided to indicate a transf er of power from the normal D.C. Switchboard source for the D.C. distribution Busses DC-llA-1, 2, and 3 to the emergency or alternate source.
On.~'o rec
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