ML20010E128
| ML20010E128 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 08/28/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Counsil W CONNECTICUT YANKEE ATOMIC POWER CO. |
| References | |
| TASK-08-03.B, TASK-8-3.B, TASK-RR LSO5-81-80-084, LSO5-81-80-84, NUDOCS 8109030124 | |
| Download: ML20010E128 (4) | |
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August 28, 1981
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Docket flo. 50-213 f( v '
N LS05 08-084
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N ffr. W. G. Counsil, Vice President D
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D Connecticut Yankee Atonic Power Co.
x Post Office Box 270 g
{(P Hartford, Connecticut 06101
Dear fir. Counsil:
SUBJECT:
SEP TOPIC VIII-3.B DC POWER SYSTEM BUS VOLTAGE M0flITORIllG Af!D AtmuNCIATI0ri, SAFETY EVALUATIO:1 FOR HADDA't NECK The enclosed staff safety evaluation is based on a contractor's document that has been nade available to you previously. This document supports the findings of the staff safety evaluation of Topic VIII-3.B and recomends rodifications to the de systems.
The need to actually implement these changes will be detemined during the integrated safety assessrent. This safety evaluation may be revised in the future if your facility design is changed or if fiRC criteria relating to this topic are modified before the integrated assessment is completed.
Sincerely, Dennis li. Crutchfield, Chief Operating Reactors Brarch fio. 5 Division of Licensing
Enclosure:
As stated cc w/ enclosure:
dp See next page
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August 28, 1981 f
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Docket No. 50-213 I
LS05 08-084 d
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f Mr. W. G. Counsil, Vice President Nuclear Engineering ai d Operations i
Connecticut Yankee Atomic Power Co.
Post Office Box 270 l
Hartford, Connecticut 06101 2
Dear Mr. Counsil:
4 SUB1rCT: SEP TOPIC VIII-3.B. DC POWER SYSTEM BUS VOLTAGE MONITORING AND ANNUNCIATION, SAFETY EVALUATION FOR HADDAM NECK The enclosed staff safety evaluation is based on a contractor's document that has been made available te you previously.
This document supports the findine,s of the staff safety evaluation of Topic VIII-3.B and recommends modificat'.ons 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 your facility design is changed or if NRC criteria relating to j
this topic are modified before the integrated assessment is completed.
Sincerely, bggb4 Dennis M. Crutchfield, C ef
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Operating Reactors Branch No. 5 Division of Licensing l
Enclosure:
As stated cc w/ enclosure:
See next page l
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HADDAM NECK Docket No. 50-213 Mr. W. G. Counsil cc Day, Berry & Howard Counselors at Law One Constitution Plaza Hartford, Connecticut 06103 Superintendent Haddam Neck Plant RFD #1 Post Office Box 127E East Hampton, Connecticut 06424 Mr. Richard R. Laudenat Manager, Generation Facilities Licensing Northeast Utilities Service Company P. O. Box 270 Hartford, Connecticut 06101 Russell Library 119 Broad Street Middletown, Connecticut 06457 Board of Selectmen Town Hall Haddam, Connecticut 06103 Connecticut Energy Agency ATTN: Assistant Director Research and Policy Development Department of Planning and Energy Policy 20 Grand Street Hartford, Connecticut 06106 U. S. Environmental Protection Agency Region 1 Office ATTN: EIS COORDINATOR JFK Federal Building Boston, Massachusetts 02203 Resident Inspector Haddam Neck Nuclear Power Station c/o U. S. NRC East Haddam Post Office East Haddam, Connecticut 06423
SYSTEMATIC EVALUATION PROGRAM TOPIC VIII-3.B HADDAM NECK TOPIC:
VIII -3.B, DC POWER SYSTEM BUS VOLTAGE MONITORING AND ANNUNICATION I.
INTRODUCTION To assure the design adequacy of the dc power system battery and bus voltage monitoring and annunciation schemes such that the operator can (1) prevent the loss of an emergency dc bus; or (2) take timely corrective action in the event of loss of an energency dc bus, we reviewed the dc power system battery, battery charger, and bus voltage monitoring and annunciation design with respect to dc power system operability status I
indication to the operator.
II.
REVIEW CRITERIA The review criteria are presented in Section 2 of EG&G Report, "DC Power Systen Bus Voltage Monitoring and Annunciation Firal Draf t Haddam Neck".
III.
RELATED SAFETY TOPICS AND INTERFACES None IV.
REVIEW GUIDELINES None V.
, EVALUATION As noted in EG&G Report tne Haddam Neck control room has no indication of battery current or charger output breaker / fuse status. Therefore, the Haddam Neck dc power system monitoring is not in comoliance with current licensing criteria.
VI.
CONCLUSION The staff proposes that as a minimum, the following indications and alarms of the Class IE dc power system (s) status shall be provided in the control room.
Battery current (ammeter-charge / discharge)
Battery charger output current (ammeter)
DC bus voltage (voltmeter)
DC bus ground alarm (for ungrounded system)
Battery breaker (s) cr fust (s) open alarm Battery charger ootput breaker (s) or fuse (s) open alarn i