ML19321A854

Forwards Evaluation of SEP Topic VIII-3,DC Power Sys Bus Voltage Monitoring & Annunciation. Requests That NRC Be Informed If as-built Facility Differs from Basis Assumed in Assessment

ML19321A854
Person / Time
Site:	Dresden
Issue date:	07/01/1980
From:	Crutchfield D Office of Nuclear Reactor Regulation
To:	Peoples D COMMONWEALTH EDISON CO.
References
NUDOCS 8007240295
Download: ML19321A854 (5)

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UNITED STATES 5 \\ l v.( ( k NUCLEAR REGULATORY COMMISSION 3%* "

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July 1, 1980 Docke+, No. 50-10 Mr..D. Louis Peoples Director of Nuclear Licensing Comonwealth Edison Company Post Office Box 767 Chicago, Illinois 60690

Dear Mr. Peoples:

RE: SEP TOPIC VIII-3.B D C POWER SYSTEM BUS VOLTAGE MONIIDRING AND ANNUNCIATION Enclosed is a copy of our evaluation of Systematic Evaluation Program Topic VIII-3.B. D C Power System Bus Voltage Monitoring and Annunciation. This assessment compares your facility, as described in Docket No. 50-10 with the criteria currently used by the regulatory staff for licensing new facilities. Please inform us if your as-built facility differs from the licensing basis assumed in our assessment.

We have discussed this assessment with your staff and believe the facts concerning your plant are correct. Therefore, our review of this topic is conplete and this evaluation will be a basic input to the integrated safety assessment for your facility unless you identify changes needed to reflect the as-bui't conditions at your facility.

This topic assess-ment may be revised in the future if your facility design is changed or if NRC criteria relating to this topic are modified before the integrated assessment is conpleted.

Si cerely, Dennis M. Crutchfield, ief Operating Reactors Branch #5 Division of Licensing

Enclosure:

Congleted SEP Topic VIII-3.B cc w/ enclosure:

See next page a

8 00 7 2 40.2M '

Mr. D. Louis Peoples July 1, 1980 cc w/ enclosure:

Isham, Lincoln & Beale Director, Technical Assessment Counselors at Law Division One First National Plaza, 42nd Floor Office of Radiation Programs Chicago, Illinois 60603 (AW-459)

U. S. Environmental Protection Mr. B. B. Stephenson Agency Plant Superintendent _

Crystal Mall #2 Dresden Nuclear Power Station Arlington, Virginia 20460 Rural Route #1 Morris, Illinois 60450 U. S. Environmental Protection Agency U. S. Nuclear Regulatory Commission Federal Activities Branch Resident Inspectors Office Region V Office Dresden Station ATTN: EIS C0ORDINATOR RR #1 230 South Dearborn Street Morris, Illinois 60450 Chicago, Illinois 60604 Susan N. Sekuler Mr. Richard E. Schaffstall Assistant Attorney General KMC, Incorporated.

Environmental Control Division 1747 Pennsylvania Avenue, NW 188 W. Randolph Street Washington, D. C.

20006 Suite 2315 Chicago, Illinois 60601 Morris Public Library 604 Liberty Street Morris, Illinois 60451 Chairnan Board of Supervisors of Grundy County Grundy County Courthouse Morris, Illinois 60450 Department of Public Health ATTN: Chief, Division of Nuclear Safety 535 West Jefferson Springfield, Illinois 62761 I

SE? TECHNICAL EVALUATION TOPIC VIII-3.3 DC POWER SYSTEM 3US VOLTAGE MONITORING AND ANNUNCIATION DRESDEN UNIT 1

1.0 INTRODUCTION

The objective of this review is to determine if the DC power sys-tem bus voltage monitoring and annunciation are in compliance with current licensing criteria for Class II DC power systems.

,The specific requirements for DC power system monitoring derive from the general requirements embodied in Sections 5.3.2(4), 5.3.3(5),

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and 5.3.4(5) of IEEE Standard 308-1974, and in Regulatory Guide 1.47,

In sunmaary, these general requirements simply state that the DC system (batteries, distribution systems, and chargers) shall be monitored to the extent that it is shown to be ready to perform its intended function.

2.0 CRITERIA 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 (anumecer-charge / discharge) e Battery charger output current (ammeter) e DC bus r)~iage (voltmeter) e Battery charger output voltage (voltmeter) e Battery high discharge face alarm e

DC bus undervoltage and overvoltage alarm e

i DC bus ground alarm (for ungrounded system) e 3attery breaker (s) or fuse (s) open alarm 9

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Battery charger output breaker (s) or fuse (s) open e

alarm Bactery charger trouble alarm (one alarm for a number e

of abnormal conditions which are usually indicated locally).

3.0 DISCUSSION AND EVALUATION 3.1 Discussion. Dresden Unit I has three Class IE DC power sys-tems. The oldest system is composed of one 125 V battery, two chargers, and a DC bus; the two new systems are each comprised of a 125 V battery, a charger, and a DC bus. Control room indication for the old system consists of a "125 Volt DC System" trouble alarm which provides an alarm of DC ground; local (charger room) indication consists of charger current anuneters and a switchable voltmeter which can read battery voltage or either charger voltage.4 Control room indication for the new systems consist of bus voltmeters, battery and charger breaker open alarms, and charger trouble alarms; local indication consists of battery and charger voltmeters and ansneters.5,6,7 3.2 Evaluation. The Dresden Unit I control room has no indication of battery current, charger output current, bus voltage (old system),

charger output voltage, battery high-discharge rate, bus under/over-voltage, or bactery and charger breakar/ fuse status (old system).

Therefore, the Dresden Unit i DC power system monitoring is not in compliance with current licensing criteria.

4.0

SUMMARY

Of 11 paramters required to be indicated or alarmed in the control 1

room, one is alarmed for the old system and four are indicated or alar-

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med for the new systems. Therefore, the Dresden Unic 1 DC power systems 1

are 2E monitOFed in compliance with c11Pfant II****I"$.Critaria.

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5.0 REFRENCES 1.

IEEE Standard 308-1974, " Standard Criteria for Class IE Power Systens for Nuclear Power Generating Stations."

2.

Regulatory Cuide 1.74, "3ypassed and Inoperable Status Indi-cation for Nuclear Power Plant Safety Systems."

3.

NRC Memorandum, PS3 (Rosa) to SEP3 (Crutchfield), "DC System Monitoring and Annunciation," dated October 16, 1979.

4.

Letter, Commonwealth Edison (Janecek) to DOR (Ziemann),

"Dresden Units 1 and 2, Systematic Evaluation Program, Topic VIII-3.3", dated July 25, 1979.

5.

Dresden Unit 1 drawing 12E-1396, Revision E, dated 8-6-79.

6.

Dresden Unit i drawing 12E-1397, Revision E, dated 8-6-79.

7.

Dresden Unit i drawing 12E-1485F, Revision A, dated 7-20-79.

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