ML18043A845

Forwards List of Alarms & Voltage Monitoring Devices Associated W/Class IE Batteries,In Response to NRC 790618 Request

ML18043A845
Person / Time
Site:	Palisades, Big Rock Point  File:Consumers Energy icon.png
Issue date:	07/23/1979
From:	Bixel D CAROLINA POWER & LIGHT CO.
To:	Ziemann D Office of Nuclear Reactor Regulation
References
TASK-08-03.B, TASK-8-3.B, TASK-RR NUDOCS 7907260727
Download: ML18043A845 (4)

Text

General Offices: .212 West Michigan Avenue, Jackson, Michigan 49201 * (517) 788-0550 July 23, 1979

.REGULATORY DOCKET FILE COPY Director, Nuclear Reactor -Regulation

• Att Mr Dennis L Ziemann, Chief Operating Reactors Branch N.o 2 US Nuclear Regulator'J.Com:nission Washington, DC 20555 DOCKETS 50-155 AlID 50-255 - LICENSES DPR-6 A.ND DPR-20 :- BIG ROCK POINT AMD PALISADES PLA.J.'ITS:

SEP TOPIC VIII-3.B, "DC POWER SYSTEM BUS VOLTAGE MONITORING A.ND ANNUNCIATION" Consumers Power Company was requested by NRC letter dated June 18, 1979. to*

provide a list of a11

• alarrils and voltage monitcririg devices associated with Class IE batteries. The NRC letter stated this information was needed to support revie:;r of the subject SEP topic.

• The requested information for Big Rock Point and Palisades. is attac!led.

?

David A Bixel Nuclear Licensing Administrator CC .JGKeppler; USNRC .*

.* ~

.~o\\'

1 BIG ROCK POEJ'I' PL.ANT Question: To complete the evaluation of topic VIII-3.B, a list of all alarms and voltage monitoring devices available to provide operability status indication to the operator for Class IE batteries, associated chargers and direct:--current buses is required.

Response

The following alarms and devices are available at Big Rock Point for the Class IE batteries, chargers and buses.

A. Station Battery - 125 V D-C Battery Charger - Indicators *and Alarms

1. Ammeter (current output) local indicat.or.

2. Voltmeter (voltage output) - local indicator.

3. Loss of a.-c to battery charger - control room alarm.*

4. Ground detector - control room alarm.*

5. Undervol tage relay on charger output - control room alarm.*

125 V D-C Bus - Indicator and Alarms

1. Battery overcur:rent - control room alarm.*

2. Ammeter - local indicator.

• Common alarm in control* room, "125 V D-C System Trouble."

B. Uninterruptible Power Supnlies (UPS) for the Reactor Depressurizin~ Svstem

1. Positive and negative ground detector lites. **

2. Battery charger output undervoltage lite. **

3. Battery charger output. ammeter.

4. Battery charger output voltmeter.

5. Battery output ammeter.

6 .. Battery output discharge alarm.**

• • Common alarm in the control room indicating "UPS abnormal." After reaching the UPS, the operator has the remaining indicators to ascertain the trouble with the d-c portion of the UPS.*

• Note that the Technical Specification 11.3.5.3-7 perin.its one of the four U?Ss to be out of service for up to seven days.

2 C. Emergency Diesel Generator Battery A common alarm sounds in the control room indicating "::2nergency Generator

~ngine Trouble." In accordance with procedure, the operator is required, in part, to inspect the batteries and to check that the battery charger is on.

D. Diesel Fire Pumo Batteryr

.. ,A :;c.ommon alarm sounds in the control, .~o.pm. indica,ting 1'.D.ies*el ':f.lj_'.:ne :*Pump Trouble." In accordance with procedure, the operator is required, in part, to inspect the bat_tery and equipment.

. (J PALISADES PLrUifT Question: . To complete the evaluation of. topic VIII-3.B, a list of all alar.n.s and voltage monitoring devices available to provide operability status indication to the operator for Class IE batteries, associated chargers and direct:...Current.buses is required.

Response .*

The following ala._"r"!:lS and deviqes are available for Class I.E .batteries, chargers and associated equipment at the Palisades Plant.* For Palisades this consists of two station batteries, four battery chargers and two d~c buses~ Indicators and alarms for this equipment are desc:dbed below.

Battery Charger - Indicators and _l\.la._"'"m.S

l. Ammeter - local indicator~.

2. Voltmeter - local indicator.

3. Charger undervoltage - control room alarin.

• 125 V D-C Bus - Indicator and Alarms

l. Ground detector - control room alarm.*

2 . .* GroUI1d recorder - local. indicator.

J. Bus undervoltage - control room alarm.*

4 .. A.mm.et er. - local . iridi cator.

5. Voltmeter - loc?;l indicator.~

• A common alarm sounds in the control room indicating "125 V D-C Bus Trouble.

In addition to the above d-c *bus monitoring devices, *there are alarms and indi.-

cators associated with the 120 V a-c preferred* power panels. Since the pre-

. ferred power panels* take *their* normal* power supply from the* d;...c buses; the** *

• following alarms could be a further indication of d""'.c bus failure.

l. Preferred bus underwitage ~ cor,itrol room alarm.**

2. Ammeter (ctirrent input to inverter) - local indicator.

3. Ammeter (current out of. inverte!") - local indicator.

4. *F.requ~ncy meter. - local indicator.

5. Ground detector ,.. control room alarm.*

6.

• Voltage meter - local. indicator.

• A common alarm. sounds indicating "preferred a-c bus trouble."