ML20041C423
| ML20041C423 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 01/31/1982 |
| From: | Farmer F EG&G, INC. |
| To: | Scholl R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20041C421 | List: |
| References | |
| CON-FIN-A-6425, TASK-08-03.B, TASK-8-3.B, TASK-RR 0216J, 216J, EGG-EA-5756, NUDOCS 8203010336 | |
| Download: ML20041C423 (8) | |
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EGG-EA-5756 JANUARY 1982 SYSTEMATIC EVALUATION PROGRAM, TOPIC VIII-3.B, DC POWER SYSTEM BUS VOLTAGE MONITORING AND ANNUNCIATION, BIG ROCK POINT F. G. Farmer i
U.S. Department of Energy Idaho Operations Office
- Idaho National Engineering Laboratory bc }"'
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1 This is an informal report intended for use as a preliminary or working document Prepared for the U.S. Nuclear Regulatory Comission Under DOE Contract No. DE-AC07-761001570 g
FIN No. A6425 6 S E G io.no 8203010336 820222 PDR ADOCK 05000155 P.
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INTERIM REPORT Accession No.
Report No.
EGG-EA-5756 Centract Program or Project
Title:
Electrical, Instrumentation, and Control Systems Support for the Systematic Evaluation Program (II)
Subject of this Documents Systematic Evaluation Program, Topic VIII-3.B, DC Power System Bus Voltage Monitoring and Annunciation, Big Rock Point Type of Document:
Informal Report Author (s):
F. G. Farmer Date of Document:
January 1982 Responsible NRCIDOE Individual and NRCIDOE Office or Division:
R. F. Scholl, Division of Licensing, NRC This document was prepared primarily for preliminary orinternat use. it has not received f ull review and approval. Since there may be substantive changes, this document should not be considered final.
EG&G Idaho. Inc-Idaho Falls. Idaho 83415 Prepared for the U.S. Nuclear Regulatory Commission Washington, D.C.
Under DOE Contract No. DE-AC07-761001570 NRC FIN No.
A6425 INTERIM REPORT
0216J SYSTEMATIC EVALUATION PROGRAM TOPIC VIII-3.B DC POWER SYSTEM BUS VOLTAGE MONITORING AND ANNUNCIATION BIG ROCK F0 INT Docket No. 50-155 January 1982 F. G. Farmer EG&G Idaho, Inc.
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- p ABSTRACT This SEP technical evaluation, for Big Rock Point, compares the Class lE DC power system bus voltage monitoring and annunciation with current licensing criteria.
FOREWORD This report is supplied as part of the " Electrical, Instrumentation, and Control Systems Support for the Systematic Evaluation Program (II) being conducted for the U.S. Nuclear' Resalatory Commissicn, Office of Nuclear Reactor Regulation, Division of Licneing by EG&G Idaho, Inc.,
Reliability & Statistics Branch.-
The'U.S. Nuclear Regulatory Commission funded the work under the authorization B&R 20-10-02-05, FIN A6425.
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SYSTEMATIC EVALUATION PROGRAM TOPIC VIII-3.B N DC POWER SYSTEM BUS VOLTAGE
' MONITORING AND ANNUNCIATION blGROCKPOINT l.0 INTRdDUCTION s
s l1)
The objective of this review is' to determine if the DC power system
-bus voltage monitoring and annunciation are in compliance with current licensing' criteria for Class lE 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),gnd I
5.3.4(5) of IEEE Standard 308-1974, and in Regulatory Guide 1.47.
In summary, these general requirements simply state that the DC system (bn-teries, 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 lE DC power system (s) status shall be provided in the control room:3 I
o Battery current (ameter-charge / discharge)-
o Battery charger output current (ammeter)'
y o DC bus voltage (voltmeter)
DC bus ground alarm (for ungrounded syst'm) o.
e o Battery breaker (s) or fusc(s) open alarm o Battery charger output breaker (s) or fuse (s) open alarm 3.0 DISCUSSION AND EVALUATION 3.1 Discussion.
Big Rock Point utilizes seven Class lE DC power sys-tems:
one 125 V DC system comprised of one battery and ' 2 cm rgers; four Uninterruptible Power Supplies (UPS), each comprised o' a i.ttery and charger; a diesel gegerator battery and charger; arf ; :lir el fire pump battery and charger.
Control room monitoring of tis Y D' system s
consists of a "125.V D-C System Trouble" alarm whim ack.a?ts on battery / battery charger overcurrent, positive or negative bus ground, loss of charger input supply voltage, or 125V DC bus undervoltage; local indica-tion consists of charger output current and bus voltage, current, and ground.
Control room monitoring of the UPS consists of a "UPS Abnormal" alarm; loc'al indication consists of battery output current, charger output current and voltage, inverter input current, and inverter output current, 1
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O te voltage and frequency.
Control room monitoring of the Diesel Generator and Diesel Fire Pump systems consists of an " Emergency Generator Engine Trouble" alarm and a " Diesel Fire Pump Trouble" alarm, respectively.
3.2 Evaluation.
The Big Rock Point control room has no indication of battery current, charger output current, bus voltage, battery breaker / fuse status, or charger breaker / fuse status for any of the Class 1E DC power systems; it also has no indication for battery high discharge rate or bus ground for the two diesel battery systems. Therefore, Big Rock Point DC power systems monitoring is not in compliance with current licensing criteria:
4.0
SUMMARY
Of six parameters currently required to be indicated or alarmed in the control room, only two are alarmed for the 125 V DC and UPS systems and none are indicated or alarmed for the two diesel battery systems. There-fore, the Big Rock Point DC power systems are not monitored in compliance with current licensing criteria.
5.0 REFRENCES 1.
IEEE Standard 308-1974, " Standard Criteria for Class lE Power Systems for Nuclear Power Generating Stations."
2.
Regulatory Guide 1.47, " Bypassed and Inoperable Status Indication for Nuclear Power Plant Safety Systems."
3.
Letter, NRC (Crutchfield) to Consumers Power (Hoffman), "SEP Topic VIII-3.8, DC Power System Bus Voltage Monitoring and Annunciation, Safety Evaluation for Big Rock Point," dated August 15, 1981.
4 Letter, Consumers Power (Hoffman) to NRR (Crutchfield), "SEP Topic VIII-3.8, DC Power System Bus Voltage Monitoring and Annunciation," dated January 7,1982.
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9 SYSTEMATIC EVALUATION PROGRAM TOPIC VII-3.B BIG ROCK POINT TOPIC:
VII-2.B, DC Power System Bus Voltage Monitoring and Annu~nciation I.
. INTRODUCTION To assure the design adequacy of the de power system battery and bus voltage monitcring 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 dc power system bat,tery, battery charger, and bus volt-age monitoring and annunciation design with respect to de power sys-tem operability status indication to the operator.
II.
REVIEW CRITERIA The review criteria are presented in Section 2 of EG&G Report EGG-EA-5756, "DC Power System Bus Voltage Monitoring and Annunciation".
III.
RELATED SAFETY TOPICS AND INTERFACES None IV.
REVIEW GUIDELINES None V.
EVALUATION j
As noted in the report, the Big Rock Point control room has no indica-tion of de bus voltage, battery current, battery charger current, or i
breaker / fuse status.
Therefore, the Big Rock Point dc power system monitoring is not in compliance with current licensing criteria.
VI.
CONCLUSION
-s The staff proposes that as a minimum, the following additional indica-tions and alarms of the Class lE de power system (s) status shall be provided in the control room:
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 l
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Battery charger output breaker (s) or fuse (s) open alarm de bus voltage i
The purpose of these changes is to bring the de systems into compliance with Section 4.20.f IEEE Std. 279-1971.
Section 4.20 states:
"4.20 Information Read-Out.
The protection system shall-be designed to provide the operator with accurate, com-plete, and timely information pertinent to its own status and to generating station safety.
The design shall min-imize the development of conditions which would cause meters, annunciators, recorders, alarms, etc, to give anomalous indications confusing to the operator."
The capability of the battery charger to supply the normal loads pre-cludes timely detection of high resistance connections in the battery circuit.
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