ML19206A791
| ML19206A791 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/30/1978 |
| From: | Herbein J Metropolitan Edison Co |
| To: | Varga S Office of Nuclear Reactor Regulation |
| References | |
| GQL-0564, GQL-564, NUDOCS 7904210379 | |
| Download: ML19206A791 (12) | |
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Decket :Ic. SC-320 License :Tc. OF3-73 Attached please find a repcrt.-hich prcvides the ice =enta~ a A confi__.ation cf ccrrect voltage tap settings required 'cv Ccndition D.1 cf attac'=ent 2 tc Cperating License DPE-72
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Three Mile Island Nuclear Pcwer Plant Unit 2 Optini:ation and Verification of Bus Voltages On March 23, 1978 a bus voltage measurement test program was implemented for the Th ae Mile Island Unit 2 electrical dis-tribution system.
The purpose of these measurements was to gather sufficient #ield data which could then be compared with the analytical results for similar conditions, and thus establish a level of confidence on the ability of the analytical program to predict bus voltage behavior during different plant load conditions.
Voltage measurements were taken on various buses while observing the operating leads on these buses.
Since the plant was essentially in a shutdown mcde the varicus pumps which were allowed to run on the different buses were not operating at full load, and thus pump horse power nameplate rat-ing could not be used as an indication of the actual electrical load.
Bus voltage and current =easurements were taken instead, on the various buses in order to arrive at a KVA load for each bus which would more closely resemble the actual load.
For the purpose of these tests and in order to confine the person-nel involved and the areas to be covered to a manageable number, the plant electrical distribution system was divided inte four major areas, to coincide closely with the physical laycut of the equipment.
Area 1:
Centrol Recm and Centrol Building Elevation 351' (Bus 2-12E and Bus 2-22E)
Area 2:
Turbine Building Elevation 3^5' (Buses :
2-1, 2-3, and 2-4)
Elevacien 331' (Centrol Pane _ 316) and "cntrol Bldg.
Area Elevation 280' (Control Panel 317)
Area 3:
River Water pump Ecuse (Buses :
2-3E, 2-4E, 2-31E, and 2-41E)
Area 4:
Auxiliary Bldg. Elevation 328' (Bus 2-lE and 2-2E) and Elevation 305' (Bus 2-llE and 2-21E)
In order to take readings on all buses at essentially the same time, one test group was sent to each of these areas.
As part of the Test procedure, data sheets for each area were prepared in advance, which cutlined what :easurements were to be taken, where they neMed tobe taken, and hcw to take them.
Tc reduce the snount of time required to ccmolete the entire test precedure, a number of meters were set up in advance.
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O Page 2 Digital portable meters were used to measure valvues of currents Pcwer factor meters were also used on some buses.
and voltages.
Coordination among the various crews was established via a common channel of the existing paging system.
At 8:00 p.m., March 23, 1978, the bus voltage measurement program started.
It concluded at S:45 p.m.
The results of the tests are shown on Table 1 as well as on Figure 1.
In order to correlate the measured values with the analytical a computer program was prepared which recreated the
- results, The computer was then asked plant conditions during the test.
to print out expected bus voltage values for these same con-ditions.
2 and on The results of the ccmputer analysis are shown on Table Figure 1.
Comparison of the actual measured valu 5~ahd the ccmputer analysis, as shown on Figure 1, indicates that the analytical results are within 2% of the measured values in most cases.
The ability of the ccmputer analysis to predict bus voltage values at dif ferent plant operating conditions can thus be established.
By using the same analycical approach, it has been determined that in order to optimize the voltages at the various buses, the transformer taps at all the Unit Substations buses must he set at -2.5%,
as currently exists.
Table 3 below shcws the expected voltages at the different buses curing the normal operating grid voltage range of the plant.
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Page 3 TABLE 3
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VOLTAGES PROFILES AT THE SAFETY RELATED BUSES I)
No Lead Full Load Bus Min. Normal Max. Normal Min. Normal Max. Normal 230KV GRID 232KV 238KV 232KV 238KV 4.16KV 2-lE 4.196KV 4.305KV 3.889KV 4.007KV 4.16KV 2-2E 4.196KV
. 305KV 3.871KV 3.989KV 4.16KV 2-3E 4.196KV 4.305KV 3.886KV 4.004KV 4.16KV 2-4E 4.196KV 4.305KV 3.871KV 3.989KV 480V 2-llE 496V 509V 452V 466V 480V 2-21E 496V 509V 449V 463V 480V 2-12E 496V 509V 460V 474V 480V 2-22E 496V 509V 454V 468V 480V 2-31E 496V 509V 460V 474V 480V 2-41E 496V 509V 453V 466V 120V 2-11EB 124V 127V 113V ll7V (1)
Based on tap settings of -2.5% at USS Transformers and nominal tap at the Aux. Transformers.
(2)
No Load Condition is assumed when the unit is shutdown ard only the essential services are fed from the corresponding buses.
VGLTAGE RANGE FOR SAFE EQUIPMENT OPERATION Safe Operating Range Design Minimum Maximum Device Value Voltage 57oltage Mctors 4000V 4000V 3600V 4400V Motors 460V 460V 414V 506V Macnetic Starters 480V 384V 523V Solenoid Valves 120V 102V 140V Instruments ll8V 106V 130V It can thus be concluded that the equipment should operate safely within the normal operating grid voltage range.
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sE 1 Page 1 of 6 Area 1 Centrol Rocm and Control Building Elevation 351' CONTRCL RCCM Measured CT or Value at PT
= Actual Component Location CT/PT x
Patio Value Grid Voltage System 238KV Dispatcher 2A Aux. Transf. Pri. Amps Panel 6A
.4 60 24 2B Aux. Transf. Pri. Amps Panel 6A
.7 60 42 Bus 2-5 volts Panel 6A 68.6[3 35 4158.5 Bus 2-6 Volts Panel 6A 69.5 [3 35 4213.1 Bus 2-5 Amps Panel 6A
.7 400 280 Bus 2-6 Ampa Panel 6A
.34 400 336 Bus 2-5 Power Factor Panel 6A 41
(.75)
Bus 2-6 Pcwer Factor Panel 6A 39.5
(.77)
Bus 2-2 tw Meter Panel 6A 6.5 MW Bus 2-3 kw Meter Panel 6A 2.5 FM Bus 2-4 kw Meter Panel 6A 0
MU Bus 2-5 kw Meter Panel 6A 3.0 MW Bus 2-6 kw Meter Panel 6A 3.8 MW Bus 2-2E kw Meter Panel GC
.7 MW' Bus 2-lE kw Meter Panel 6B 1.0 MW CCNTRCL BUILDING ELEVATION 351' Measured CT or Value at PT
= Actual Ccmponent Unit 4 CT/PT Ratio value USS 1-12E Volts 33C 120.4 4
481.6 USS _-12E Amps 323
.6 600 163 CSS 2-22E Volts 41C 122.6 4
488 USS 2-22E Amps 423
.3 600 1PO
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TABLE 1 Page 2 of 6 AREA 2 Turbine Bldg. Elev. 305 (Bus 2-1 and 2-2)
Measured PT or Value at CT Actual Equipment Unit No.
CT/PT Ratio Value Bkr. 2A-12 Amps 1-5 NA 400 0
Skr. 23-12 Amps 1-2 2.5 400 1000 Bus Volts 1-1 116.7 60 7002 RC-P-1A Amps 1-3 1.9 240 456 RC-P-13 Amps 1-4 2.3 240 552 Bkr. 2A-22 Amps 2-2 1.4 400 560 Bkr. 2B-22 Amps 2-5 NA 400 0
Bus Volts 2-1 118.2 60 7092 RC-P-2A Amps 2-4 NA 240 0
RC-P-2B Amps 2-3 2.3 240 552 Bus 2-3 Volts 120.2 35 4207 Jus 2-3 Amps
.8 600 480 Bus 2-4 Volts 121.2 35 4242 Bus 2-4 Amps
.2 600 120 Bus 2-3 Power Factor 34.5o (0.82)
Bus 2-4 Power Factor 32-350 (.84-82) f sg%
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TABLE 1 Page 3 of 6 AREA 3 River Wat.er Pump House Bus 2-3E Measured CT or Value at PT Actual Component Unit No.
CT/PT Ratio Value NR-P-1A Amps 3E-3 NA 20 NA NR-P-13 Amps 3E-4 2.3 20 46 Bus Volts 3E-5 118.65 35 4152.7 Bus 2-4E NR-P-lD Amps 4E-2 2.3 20 46 NR-P-lc Arr.p s 4E-3 NA 20 NA Bus Volts 4E-5 120.55 35 4217.5 Bus 2-31E Bus Amps FTl 0.2 60 12 Bus Volts llc 123.08 4
492.3 Bus 2-41E Bus Amps 21C 0.3 60 18 Bus Volts 22C 124.25 4
497 Component Location On/off SW-P-1A Control Panel 326 CFF SW-P-13 Control Panel 326 OFF
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TABLE 1 Page 4 of 6 AREA 4 Auxiliary Building 328 Measured CT or Value at PT Actual Equipment Unit No.
CT/PT Ratio Value Bus 2-lE Bkr. 2A-lE2 Amps lE-10 NA 400 0
Bkr. 23-lE2 Amps 1E-13
.5 400 200 Bus Volts 1E-1 118.6 35 4151 BS-P-1A Amps lE-4 NA 20 0
MU-P-1A Amps 1E-5 30 0
MU-P-13 Amps lE-6 2.1 30 63 Skr. T1E-3E
-2 Amps 1E-7
.6 80 48 EF-P-2A Amps lE-8 NA 20 0
Bkr. lE-12E-2 Amps
.5 30 DH-P-1A Amps lE-9 NA 20 0
Power Factor 370 (.798)
Brk. lE-llE
-2 Amps
.9 60 54 C'g t' gs.
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TABLE 1 Page 5 of 6 AREA 4 Aaxiliary Building 329 Measured CT or Value at PT Actual Equipment Unj t No.
CT/PT Ratio Value Bus 2-2E Skr. 2A-2E2 Amps 2E-15
.3 400 120 Bkr. 2B-2E2 Amps 2E-12 NA 400 0
BS-P-13 Amps 2F-5 NA 20 0
MU-P-lC Amps 2E-6 NA 30 0
MU-P-13 Amps 2E-7 NA 30 0
.6 80 18 Bus Volts 2E-9 120.5 35 4217.5 EF-P-2B Amps 2E-10 NA 20 0
CH-P-13 Amps 2 E - l '.
NA 20 0
Phase Angle 440(.719) 2E-22E Amps
.4 24 2E-21?
Amps
.9 54 ng u.s
TABLE 1 Page 6 of 6 AREA 4 Auxiliary Building 305 1.
Continued Bus 2-llE CT or Measured PT Actual Cor.penents Unit No.
Value Factor Value Bus volts 13C 119.6 4
473.4 Amps 123
.8 600 480 Bus 2-21E Bus Volts 21C 121.1 4
484.4 Bus Amps 223
.7 600 420 g/;- C:29
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