ML20092J557
| ML20092J557 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 01/31/1992 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20092J561 | List: |
| References | |
| NUDOCS 9202240318 | |
| Download: ML20092J557 (4) | |
Text
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3/4.8 ELECTRICAL POWER SYSTEMS BASES 3/4.8.1 3/4.8.2, and 3/4.8.3 LT5TRH6 TION A.C. SOURCES, D.C. SOURCES, and ONSITE POWER The OPERABILITY of the A.C. and D.C power sources and associated distribution systems during operation ensures that sufficient power will be available to supply the safety-related equipment required for (1) the safe shutdown of the facility, and (2) the mitigation and control of accident condi-tions within the facility.
The minimum specified independent and redundant A.C. and D.C. power sources and distribution systems satisfy the requirements of General Design Criterion 17 of Appendix A to 10 CFR Part 50.
The ACTION rN oirements specified for the levels of degradation of ths power sources provide restriction upon continued facility operation commensurate with the level of degradation.
The OPERABILITY of the power sources are consistent with the initial condition assumptions of the safety analyses and are based upon maintaining at least one redundant set of onsite A.C. and D.C.
power sources and associated distribution s conditions coincident wi',h an assumed loss ystems OPERABLE during accident of offsite power and single failure of the other onsite A.C. source.
The A.C. and D.C. f.ource allowable out-of-service times are based on Regulatory Guide 1.93, " Availability of Electrical Power Sources," December 1974. When one diesel generator is inoperable, there is an additional AC110N requirement to verif subsystems, trains, com:onents and devices, y that all required systems, that depend on the remaining OPERABLE diesel generato as a source of emergency power, are also OPERABLE, and that the steam-driven auxiliary feedwater pump is OPERABLE.
This require-ment is intended to provide assurance that a loss-of offsite power event will not result in a complete loss of safety function of critical systems during the period one of the diesel generators is inoperable.
The term verify as used in this context means to administrative 1y check by examining logs or other information to determine if certain components are out-of service for maintenance or other reasons.
It does not mean to perform the Surveillance Requirements needed to demonstrate the OPERABILITY of the component.
The OFERABILITY of the minimum specified A.C. and D.C. power sources and associated distribution systems during shutdown and refueling ensures that:
(1) the f acility can be maintained in the shutdown or refueling condition for extended time periods, and (2) sufficient instrumentation and control capability are available for monitoring and maintaining *,he unit status.
l The Surveillance Requirements for demonstrating the OPERABILITY of the diesel generators are in accordance with the recommendations of Regulatory Guides 1.9, " Selection of Diesel Generator Set Capacity for Standby Power Supplies," Revision 1. November 1978; 1.108, " Periodic Testing of Diesel l
Generator Units Used as Onsite Electric Power Systems at Nuclear Power Plants " Revision 1, August 1977 as modified by Amendment No. 21, issued May 1, 1987; and 1.137, " Fuel-011 Systems for Standby Diesel Generators,"
Revision 1. October 1979.
Each diesel generator (DG) is provided with an l
CALLAWAY - UNIT 1 B 3/4 8 1 Amendment No. W 65 9202240318 920131 PDR ADOCK 05000403 P
ELECTRIC POBER SYSTEMS BASES A.C. SOURCES, D.C. SOURCES, and ONSUT.E POWER DISTRIBUTION (Continued) engine overspeed trip to prevent damage to the engine.
Recovery from the transient caused by the loss of a large load could cause diesel engine over-speed, which, if excessive, might result in a trip of the engine. Surveil-lance Requirement 4.8.1.1.?.f(2) demonstrates the DG load response :.haracter-istics and capability to reject the largest single load without exceeding predetemined voltage and frequency and while maintaining a specified margin to the overspeed trip as required by Regulatory Guide 1.9, Position C.4.
The Surveillance Requirements for demonstrating the OPERABILITY of the station batteries are based on the recommendations of Regulatory Guide 1.129,
" Maintenance Testing and Replacement of Large Lead Storage Batteries for Nuclear Power Plants," February 1978; and ILEE Std 450-1980, "!EEE Recommended Practice for Maintenance, Testing, and Replacement of Large Lead Storage Batteries for Generating Stations and Substations."
Verifying.verage electrolyte temperature above the minimum for which the battery was sized, total battery terminal voltage on float charge, connection resistance values and the performance of battery service and discharge tests ensures the effectiveness of the charging system, the ability to handle high discharge rates and compares the battery capacity at that time with the rated capacity.
Table 4.8-2 specifies the nc+ mal limits for each designated pilot cell and each connected cell for electrolyte level, float voltage and specific gravity.
The limits for the designated pilot cells float voltage and specific gravity, greater than 2.13 volts and 0.015 below the manufacturer's full charge specific gravity or a battery charger current that had stabilized at a low value, is characteristic of a charged cell with adequate capacity.
The normal limitsforeachconnectedcellforfloatvoltageandspecificgravity greater than 2.13 volts and not more than 0.020 below the manufacturer s full, charge specificgravitywithanaveragespecificgravityofalltheconnectedcells not more than 0.010 below the manuf acturer s full charge specific gravity, ensures the OPERABILITY and capability of the battery.
Operation with a battery cell's parameter outside the normal limit but within the Allowable Value specified in Table 4.8-2 is permitted for up to 7 days.
During this 7-day period:
(1) the Allowable Value for electrolyte level ensures no physical damage to the plates with an adequate electron transfer capability; (2) the Allowable Value for the average specific gravity of all th9 cells, not more than 0.020 below the manufacturer's recommended full charge specific gravity, ensures that the decrease in rating will be less than the safety margin provided in sizing; (3) the Allowable Value for an individual cell's specific gravity, ensures that an individual cell's specific gravity will not be more than 0.040 below the manufacturer's full charge specific gravity and that the overall capability of the battery will be maintained 5'
within an acceptable limit; and (4) the Allowable Value for an individual cell's float voltage, greater than 2.07 volts, ensures the battery's capability to perform its design function.
CALLAWAY - UNIT 1 B 3/4 8-2 Amendment No. 65
i e
Mr. D. F. Schnell Callaway Plant Union Electric Company Unit No. 1 cc:
Cermak fletcher Associates Mr. Dart D. Withers
)
18225 flower Hill Way #A President and Chief i
Gaithersburg, Maryland 20879-5334 Executive Officer Wolf Creek Nuclear Operating Corporation Gerald Charnoff, Esq.
P. O. Box 411 i
lhomas A. Baxter, Esq.
Burlington, Kansas 66839 Shaw, Pittman, Potts & Trowbridge 2300 N Street, N. W.
Mr. Dan 1. Bolef, President Washington, D. C.
20037 Kay Drey, Representative Board of Ditectors Coalition Mr. T. P. Sharkey for the Environment Supervising Engineer,
- r. o? n lmar Boulevard e
Site Licensing
- r> "y City, Mit souri 65130 Union Electric Company Post Office Box 620 fulton, Missouri 65251 U. S. Nuclear Regulatory Commission Resident Inspectors Office RR#1 Steedman, Missouri 65077 Mr. Alan C. Passwater, Manager Licensing and Fuels Union Electric Company Post Office Box 149 St. Louis, Missouri 63166 Manager - Electric 9epartment Missouri Public Ser ice Commission 301 W.
High Post Ottice Box 360 Jefferson City, Missouri 65102 Regional Administrator U
- 5. NRC, Region 111 799 Roosevelt Road Glen Ellyn, Illinois 60137 Mr. Ronald A. Kucera, Deputy Director Department of Natural Resources P. O. Box 176 Jefferson City, Missouri 65102
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