ML19253B816
| ML19253B816 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 10/16/1979 |
| From: | Bixel D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| TASK-08-01, TASK-8-1, TASK-RR NUDOCS 7910220273 | |
| Download: ML19253B816 (3) | |
Text
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s Consumers Power Company g i g General Othces: 212 Wett Michigan Avenue, Jackson, Michigan 49201 e Area Code S17 788-0550 October 16, 1979 Director,:iuclear Reactor Regulation Att Mr Dennis L Ziemann, Chief Operating Reactors Branch :Io 2 US IIuclear Regulatory Cc==ission
'4ashington, DC 20555 DOCKET 50-155 - LICE:ISE DPR BIG ROCK PCI IT PLA iT - ALDITIC:iAL I:IFORMATIC I RELATIVE TO SEP TOPIC VIII-1, "O:ISI~'E E1ERGE' ICY PC'4ER SYSTDIS - DIESEL GE:ERATCES" Consuners Power Company was requested in a September 23, 1979 telephone conversation with :IRC staff members to provide additional information rela-tive to the subject Systematic Evaluation Program (SEP) topic.
The requested information was telecopied to J Knight (:IRC) on October 2,1979 and is provided as Enclosure (1) to this letter.
David A Bixel (Signed)
Eavid A Bixel
- Iuclear Licensing Ad=inistrator CC JGKeppler, US:IRC l'l50 iDi 79102202 7 3
s RESPONSE TO QUESTIONS ASKED IN CP C0/NRC TELEPHONE CONVERSATION OF SEPTIM3ER 28, 1979 QUESTION 1 - Daring routine testing, is the electric fire pu=p started by power from the e=ergency diesel generator (EDG) only or is 23 bus paralleled in some manner?
RESPONSE
- The electric fire pu=p is started solely by the EDG on semi-monthly intervals in order to de=onstrate the availability of the EDG as an emergency source of pcver. The test also provides 8 functional test of initiating sensors.
The method used to load the fire pump on the EDG is as follows:
1.
23 bus tie breaker 1A-23 is checked open.
2.
23 bus tie breaker 2A-23 is opened.
3.
Loss of voltage on 23 bus is sensed and the diesel generator receives a start signal.
k.
The diesel generator starts and energizes bus 23.
5 Pressure is bled off the sensing line at the electric fire pump discharge, simulating a lov fire syste= pressure, and the " ire pu=p starts.
QUESTION 2 - What are the voltage and frequency transients during the electric fire pump start?
RESPONSE
- During the last surveillance test of the EDG auto start and loading of the electric fire pump (EFP), the following instruments were connected in parallel to the input of the EDG voltmeter:
an Esterline-Angus recording voltmeter, a Leeds and Northrup frequency recorder, and a 3 rush recorder (chart speed 125:=/sec).
The intent of this effort was to gain coarse data in a timely
=anner to respond to this question.
DE from the recording voltmeter indicated the =axi=um and
=1
- voltage was 501 V a-c and kh1 V a-c, respectively, from a. a.c.al h90 V a-c.
The time interval for the voltage transient was taken from the 3 rush recorder which indicated that the voltage returned to its original level in approximately 0.75 second.
The frequency data was taken from both the Brush recorder and the frequency recorder. Due to the slow chart speed of the frequency recorder, only a maximu=-minimum frequency was obtained; ie, ol.6 c/s and Sh.6 c/s. Frequency versus time is listed below.
The data was obtained by dividing the Brush recorder chart into 30== intervals (corresponding to 0.2h second), counting the cycles in the interval and extrapolating the data to a one-second interval.
(The fire pump was started at the start of the third interval tabu-lated below; thus, Intervals 1 and 2 provide infor:stion regarding the frequency before application of this 1 cad. )
Enclosure (1) iiSLO i06
2 Interval Cycles Counted Frequency-c/s 1
14.5 60.h 2
14.5 60.h 3
1h.0 58.3 h
13.h5 56.0 5
13.09 5h 5 6
13.h3 56.0 7
1h.0 58.3 8
14.17 99.0 9
14.68 61.2 10 14.9 62.1 11 1h.92 62.2 12 14.94 60.2 13 14.77 61 5 1h 14.86 61 9 15 1h.85 61.9 1150 107~
Enclosure (1)