ML17277B148
| ML17277B148 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 12/02/1983 |
| From: | Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| GO2-83-1110, NUDOCS 8312130134 | |
| Download: ML17277B148 (8) | |
Text
REGULATORY ORMATION DISTRIBUTION SY M (RIDS)
ACCESSION NBR:8312130134 DOC ~ DATE: 83/12/02 NOTARIZED!
NO DOCKET PACIL;50-307 NPPSS Nuclear Pr cjectr Unit Er Naatrlngtcn Public Pcwe.
05000397 AUTH BYNAME AUTHOR AFFILIATION SORENSENiGSC, Washington Public Power Supply System RE'CIP, NAME REC IPIENT AFFILIATION SCHNENCEREA ~
Licensing Branch 2
SUBJECT:
Forwards marked<<up Page 8,3 70 to FSAREAmend 23<deleting ref to battery charger output breaker trip 5 battery charger blown fuse indication alarmsras redundanta DISTRIBUTION CODE:
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TITLE; Licensing Submittal:
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ELD/HDS2 IE/DEPER/EPB 36 IE/DEQA/QAB 21 NRR/DE/CEB 11 NRR/DE/EQB 13 NRR/DE/MEB 1S NRR/DE/SAB 24 NRA/DHFS/HFE840 NRR/DHFS/PSRB NRR/DS I/AEB 26 NRR/DS I/CP 8 1O NRR/DSI/ICSB 16 NRR/DSI/PSB 19 NRR/DSI/RSB 23 RGN5 EXTFRNAI.:
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Washington Public Power Supply System P.O. Box 968 3000George Washington Way Richland, Washington 99352 (509) 372-5000 December 2, 1983 G02-83-1110 Docket No. 50-397 Director of Nuclear Reactor Regulation Attention:
Mr. A. Schwencer, Chief Licensing Branch No.
2 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Dear Mr. Schwencer:
Subject:
NUCLEAR PROJECT NO.
2 BATTERY CHARGER ANNUNCIATION CHANGES In a telephone conversation on November 30, 1983, with Mr. Sang Rhow (NRC) and Mr. P.
Powell and Mr.
W. Gilles (SS),
Mr. Rhow agreed that the "Battery Charger Output Breaker Tripped" and "Battery Charger Blown Fuse Indication" alarms are redundant and therefore could be deleted.
The following formally documents the reason for the deletion.
In the Control
- Room, we presently alarm as "Battery Charger Trouble" fort AC Failure - internal AC failure within the charger Charger High Yoltage - charger output above 139v or 282v Charger Low Yoltage - charger output below 124v or 235v We alarm as "Battery Failure" for:
Battery Fuse Blown Battery Bus Undervoltage - battery bus below 120v or 240v In the Control Room,.meters indicate battery bus voltage, battery charger current and battery charge/discharge current.
A Under normal conditions, the battery is in the "float" mode at 130.5v or 261.0v (for..l25v and 250v battery, respectively).
In the event of an output failure of the charger (due to tripped charger output breaker, blown charger fuse or other internal charger failure), the battery bus voltage drops to about.117v or,234v immediately as the battery supplies the load.
This ches the charger low voltage relay to alarm and (with the 120v present setting) the bus undervoltage to alarm.
Both "Charger Trouble" and "Battery Failure" annunciators alarm in the Control Room.
A blown fuse indicator or charger breaker trip indication is redundant since charger low voltage occurs for either of the two.
83i2i30i34 83i202 PDR ADOCK 05000397 8
@(9
A. Schwencer Page Two G02-83-1110 BATTERY CHARGER ANNUNCIATION CHANGES In addition, the panel meters will show no charger current, battery discharge current and the battery below float voltage.
From all of this panel and annunicator information, it is clear to the Operator that something in the battery charging circuit has failed and the battery is supplying the load.
The attachment is a markup of the FSAR to reflect deletion of the charger blown fuse indicator and the charger output breaker tripped indication.
If you have any further questions, please contact Mr. P. L. Powell,
- Manager, WNP-2 Licensing.
Very truly yours, G.
C. Sor nsen, Manager Regulatory Programs WPG/tmh Attachment cc:
R Auluck -
NRC WS Chin
- BPA S
Rhow NRC AD Toth NRC Site
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WNP-2 A
DMENT NO.
23 February 1982 The DC power systems are, designed to permit periodic inspec-tion and test of important aieas such as wiring, insulation, connections, and switchboards, and thus comply with General Design Criterion 18.
Control room instrumentation and alarms are provided for each battery and battery charger to monitor the status of each power supply in accordance with IEEE Standard 308-1974 and Regulatory Guide 1.47.
This instrumentation includes indica-tion of the main bus 'voltage, battery current (charge and discharge),
and battery charger
<Recharge current.
Alarms through the'control room annunciator and computer are provided for the following abnormal conditions:
Bus undervoltage, DC system ground fault (for ungrounded systems),
battery, fuse blown, ~~Jr
~~qfplbpfp, battery charger
/
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battery charger AC failure.
Charger and battery disconnect switches are provided with position indication and group alarm in the control room.
Battery high discharge rate is not separately alarmed.
In the absence of an electrical fault and with battery charger available, all normal and emergency steady state loads are carried by the battery charger.
At 125% of its full load
- rating, the battery charger operates in a current-limiting mode and any overcurrent..in excess is supplied by the battery.
However, the feeder circuit fuses are sized to trip on over-currents of this magnitude, thereby preventing battery high discharge current to continue to the point of degrading the system.
Annunciation of the isolated Class 1E circuit is made for each connected load.
Failure of the battery charger
'also causes a battery high discharge, but this condition is moni-tored as discussed above.
8.3.2.2.1.3 HPCS (Division 3) 125 Volt DC System The 480 V AC feed to the HPCS battery charger is from the HPCS motor control center via the engine generator control panel.
. Separation between Division 3 and other independent systems is maintained and the power provided to the chargers can be from either offsite or onsite sources.
The HPCS DC system is arranqed so that the probability of a system failure resulting in loss of DC power is extremely low.
Important system com-ponents are either self-alarming on failure or capable of being tested during service to detect faults.
All abnormal conditions of selected system parameters important to sur-veillance of the system annunciate in the main control room.
Cross connections with'ther independent 125 V DC systems do not exist.
8.3-70
W