ML18045A382
| ML18045A382 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 07/18/1980 |
| From: | Frost S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| TASK-08-01.A, TASK-8-1.A, TASK-RR NUDOCS 8007230473 | |
| Download: ML18045A382 (4) | |
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~.. 1 consumers Power company General Offices: 212 West Michigan Avenue, Jackson, Michigan 49201
- Area Code 517 788-0550 July 18, 1980 Director~ Nuclear Reactor Regulation Att Mr Dennis*M Crutchfield, Chief Operating Reactors Branch No 5 US Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT - RESPONSE TO VERIFICATION OF ANALYTICAL MODELS FOR ADEQUACY OF STATION POWER NRC letter ~ated August 8, 1979, Adequacy of Station Electric Distributicn System Voltages, required the adequacy of the on-site distribution of power
- from the off-site* circu~ts to b'e verified by a t:est to assure that the analysis results are valid.
Results This test was performed on May 18, 1980. at our Palisades Plane Due to the condition of the plant when the test was run, it was not possible to simulate the worst case conditions that have been previously analyzed; therefore, an analytical model to simulate the test was prepared.
The computer s~mulation deviated from the test results by only -1.07% on the 2400 volt Bus.1D and
-0. 80~~ on the 480 volt Bus 12.
These results are in excellent correlation given the volume of computer input data that was used and t.he complexity of*
the test setup.
Consumers Power considers these results to.be completely acceptable and concludes no further testing is necessary.
J Method of Testing In order to verify the analytical model of the Palisades Plant, the Refueling Outage Test*8 (loss of off-site power) was run. 'This test consisted of starting 2300 volt. and 440 volt emergency motors off the lC and 1D 2400 volt buse.s whi.le being fed from the off-site power supply.
(See one-line diagram of the f>alisades Plant, Attachment 1.)
To test the on-site.supply (diesel generators), an SIS signal was purposely. initiated, the off-site power supply was tripped and the emergency motors.started sequentially on the diesel oc0780-0308a-48
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2 generators.
Precision oscillographs were installed to monitor the 2400 volt Bus lD voltage and current and 480 volt Bus 12 voltage, current and watts during both off-site and diesel generator.start-ups.
Description of Analytical Model The analytical tool used to model the Palisades.Plant was the Pll61 computer program (ASDOP) obtained from Duke Power Company and.adapted to Consumers Power Company's Time Sharing Option (TSO) network.
This program is also used extensively on all other Consumers Power Company power plants, fossil as well as nuclear.
The program has load flow, motor starting and 3-phase short cfrcuit analytical capability for various plant operating contingencies.
All induction motor and static loads are modeled down to the 480 volt power level.
Computer Simulation of R0-8 Test (Loss of Off-Site Power Test)
Prestart conditions were first* inputted into the Pll61 computer model of the plant.
Table 1 (attached) is a summary of the meter read.ings and computer simulated prestart.voltages and currents.
(Also, refer to attached one-line diagram.)
Once the prestart conditions were properly inputted, simulation of the emergency motor start..;ups. (R0-8 test) was executed.
Comparison of the monitored 2400 volt and-480 volt bus voltages is summarized as follows:
Oscillograph P1161 Simulation
+/-%
Bus lD (2400 Volt) 2,057.
2,035
-22
-1.07 Bus 12 (480 Volt) 373 370
-3
-.80 Comparison of* the oscillograph arid computer simulated values of the Bus lD and Bus 12 voltages indicate. only a small difference.
This verifies the accuracy and validity of the computer model for both load flow and motor start-up conditions for the Palisades Plant.
Steven R Frost Palisade~ Licensing Engineer CC JGKeppler, USNRC NRC Resident Inspector-Palisades Attachment, 2 Pages oc0780-0308a-48 i1 I
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- e COMPARISON OF METER AND P1161 PRESTART VALUES From Bus KEY/fz 6/16/80 oc0780-0308a-48 SU 102 Bus lE Bus lE Bus lE SU 1-2 Bus 1D Bus 1D SU 1-2 Bus lC Bus lC Bus lC Bus Bus lE Bus 1D Bus lC Bus 12
- To Bus
- Bus
- Bus
- Bus
- Bus
- Bus
- Bus
- Bus
- Bus
- Bus
- Bus Current Bus
- Meter
- P1161 lE 310 A 303 14 110 107 15 20 19 78 190 178 1D 313 326 12 91 103 16 72 69 lC 465 457 11 88 86 13 80 76 77 24 20 Voltage 2440 2437 2434 2435 2450 2434 468 474 TABLE 1
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1-1 U60V 1A JM50Y
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79 77 IU60Y 1B 81 TALLMADGE 10 1 ARGEITA 10 1 COOK 10 2 BUS F BUS R 2400V 11 "80V 11 801 IM50Y 78 82 1-2 TALLMADGE 10 2 21JOOY lD ARGENTA*
10 2 MAii STEP-UP ~
TRAISFORMER
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12 1 F 80 COOK 10 1 PALISADES SUBSTATIO~
3ij5KV MW MYAR
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PALISADES PLANT STATION POWER DIAGRAM POWER RESOURCES & SYSTEM PLANNING I!
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