ML17252A713
| ML17252A713 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 06/26/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Abel J COMMONWEALTH EDISON CO. |
| References | |
| TASK-08-03.B, TASK-8-3.B, TASK-RR LSO5-81-06-121, LSO5-81-6-121, NUDOCS 8107020300 | |
| Download: ML17252A713 (4) | |
Text
Docket No. 50-237 LS05 06-121 Mr; J. S. Abel Director of Nuclear Lf censfng Commonwealth Edison Company
- Post Office Box 767 Chicago, Illfnofs 60690
Dear Mr. Abel:
June 26, 1981
SUBJECT:
SEP TOPIC VIII-3.B, DC POWER SYSTEM BUS VOLTAGE MONITORING AND ANNUNCIATION, SAFETY EVALUATION FOR DRESDEN UNIT 2 o**
The enclosed staff safety evaluation fs based on a contractor's document that has been made available to you previously. Thfs document supports the ffndfngs of the staff safety evaluation of Topfc VIII-3.B and reconmends modfffcatfons to the de systems.
The need to actually implement these changes will be determined during the integrated safety assessment. Thf s safety evaluation may be revised fn the future ff your facflfty design fs changed or ff NRC criteria relating to this topf c are modified before the integrated assessment f s completed.
Enclosure:
As stated cc w/enclosure:
See nex-e page 8107020300 Sincerely,
'Dennis M. Crutchfield, Chief Operating Reactors Branch #5 Division of Licensing
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NRC FORM 31811E>/80l.NRCM 02-4i>
OFFICIAL RECORD,COPY
- USGPO: 1980-329*824
UNITED STATES NUCLEAR REGULATORY COMMISSION
'Docket No. 50-237 LS05-8l- 06-121 Mr. J. S. Abel WASHINGTON, D. C. 20555 June 26, 1981 Director of Nuclear Licensing Commonwealth Edison Company Post Office Box 767 Chicago, Illinois 60690
Dear Mr. Abel:
SUBJECT:
SEP TOPIC VIII-3.B, DC POWER SYSTEM BUS VOLTAGE MONITORING AND ANNUNCIATION, SAFETY EVALUATION FOR DRESDEN UNIT 2 The enclosed staff safety evaluation is based on a contractoris document that has been made available to you previously. This document supports the findings of the staff safety evaluation of Topic VI,II-3.B and recommends modifications to the de systems.
The need to actually implement these changes will be determined during the integrated safety assessment.
This safety evaluation. may be revised in the future if you~ facility design is changed or if NRC criteria relating to this topic are modified before the integrated assessment is completed.*
Enclosure:
As stated cc w/enclosure:
See next page
- 'ii 1
,)
~
- .Mr. J. S. Abel cc Isham, Lincoln & Beale c*ounselors at Law One First National Plaza, 42nd Floor Chicago, Illinois 60603
- Mr. B. B. Stephenson Plant Superintendent Dresden Nuclear.Power Station Rura 1 Route #1 Morris, Illinois *60450 Natural Resources Defense Council 917 15th Street, N. W.
Washington, D. c. 20005 U. s.* Nuclear Regulatory Conmission Resident Inspectors Office Dresden Station RR #1 Morri~, Illinois 60450 Mary Jo Murra,Y Assistant Attorney General Environm~ntal Control Division 188 w. Randolph Street Suite 2315 Chicago, Illinois 60601
- Morris Public Library
- 604 Liberty Street Morris, Illinois 60451 Chairman Board of Supervisors of Grundy County Grundy County Courthouse
- Morris, Illinois 60450 John F. Wolfe, Esquire 3409 Shepherd Street Chevy Chase, Maryland 20015 Or. Linda w. Little 500 Hermitage* Drive Ra 1 ei gh, No.rth Caro 1 i na 27612 DRESDEN 2 Docket No. 50-237 Illinois Department of Nuclear Safety 1035 Outer Park Drive, 5th Floor Springfield, Illinois 62704
- u. s. Environmental Protection Agency Federal Activities Branch Region V Office ATTN:
EIS COORDINATOR 230 South Dearborn Street Chicago, Illinois 60604 Dr. Forrest j*. Remick 304 East Hamilton Avenue Chicago, Illinois 60604
ENCLOSURE TOPIC:
VIII-3.B, DC POWER SYSTEM BUS VOLTAGE MONITORING AND ANNUNCIATION I.
Introduction To assure the design adequacy of the de power system battery and bus voltage monitoring and annunciation schemes such that the operator can (1) prevent the loss of an emergency de bus; or (2) take timely corrective action in the event of loss of an emergency de bus, we reviewed the de power system battery, battery charger, and bus voltage monitoring and annunciation design with respect to de power system operability status indication to the operator.
II.
Review Criteria The review criteria are presented in Section 2 of EG&G Report 1338F, "DC Power System Bus Voltage Monitoring and Annunciation.
11 III. Related Safety Topics and Interfaces None IV.
Review Guidelines.
None V.
Evaluation As noted in EG&G Report 1338F, the Dresden Unit 2 control room has no indication of battery voltage, battery current, battery charger current, or break~r/fuse status. Therefore, the Dresden 2 de ~ower system monitoring is not *in compliance with current licensing criteria.
VI.
Conclusion The staff proposes that as a m1n1mum, the following additional indications and alarms of the Class lE de power system(s) status shall b~. provided in the control room.
Battery voltage Battery current (ammeter-charge/discharge}
Battery charger output current (ammeter)
DC bus ground alarm (for ungrounded system)
Battery breaker(s) or fuse(s) open alarm Battery charger output breaker(s) or fuse(s) open alarm
.*'