ML20151Q141
| ML20151Q141 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 08/02/1988 |
| From: | BECHTEL GROUP, INC. |
| To: | |
| Shared Package | |
| ML20151Q144 | List: |
| References | |
| ST-HL-AE-2734, NUDOCS 8808110053 | |
| Download: ML20151Q141 (12) | |
Text
_ . _ . . . _ -
ATTACHMENT
..ST HL AE. /7 54 i PAGE / OF M
. ATTACHMENT I l
SUMMARY
OF UNIT 1 VOLTAGE VERIFICATION TEST RESULTS (PSB-1)
SOUTH TEXAS PROJECT
, ELECTRIC GENERATING STATION P
BY BECHTEL ENERGY CORPORATION 1
INDEX Sumary of Results Pages 1 thru 3 Test Results Sumar.y Appendix A Simplified One Line Diagrams Appendix B
, 8808110053 880802 l
POR ADOCK 05000498 P PDC
-05181/00191 l
l
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' ATTACHMENT
. . ST HL AE 3734 PAGf.g .0F AP Summary Of Results Unit i Voltage Verification Test Results (PSB-1)
South Texas Project Electric Generating 5tation As required by Branch Technical Position (BTP) PSB-1, section B.4, the project has completed a voltage verification test to confirm the adequacy of the mathematical model used for analyzing plant auxiliary power systein voltages under various plant operating conditions. The project coninitted to this effort in response to FSAR question 430.20N. This section of the BTP requires that actual measurements of bus voltages and loads be performed under the following conditions:
A. Safety related buses down to the 120 volt level are loaded to a minimum of 30 percent.
B. The existing grid and safety related bus voltages and bus loads be recorded during steady state conditions and during transient conditions with the non-concurrent starting of a large class lE motor and a large non-class lE nietor.
C. A new set of bus voltages be calculated for the voltage and load conditions measured in B above.
D. The measured ana calculated voltages be compared. The mathematical model will have been verified if good correlation exists between the measured values and the calculated values and if the actual voltages measured are not lower than 3% below the calculated values.
Voltage analyses have been performed using computer modeling techniques that studied various plant operating conditions as required by section B.3 of BTP PSB-1. These analyses have determined the steady state bus voltages under heavily loaded conditions coincident with the switchyard at a minimum anticipated voltage. Steady state light load conditions during plant shutdown and normal operating conditions were evaluated coincident with the switchyard at maximuni anticipated voltage. Transient loading conditions (e.g. during automatic load sequencing) were evaluated to confirm that adequate voltage was available to ensure the pmper starting of motor loads. The degraded voltage trip setpoint was also established in these voltage analyses. Verification of the mathematical model substantiates the validity of these other analyses.
The voltage verification test program was established in accordance with the requirements of BTP PSB-1, section B.4. Minimum required bus loads of thirty percent of the steady state bus loads evaluated in the original voltage analysis were determined and provided to the nuclear operations department.
05181/00191
ATTACHMENT
. ST HL AE #73V
&%.3.OF /J Separate tests were perfornied on train A, train B, and train C. During the tests all buses were loaded to a minimum of 30% of the maximum calculated loading, with the following exceptions; l) 480 volt motor control center E1A1 load was 28.7% (Maximum Obtainable)
- 2) 120/208 volt distribution panel DPB435 load was 26.3%. (space heaters)
In addition, during retesting of some voltage points the following two buses were less than 30% loaded. These were retests to verify results obtained during a previous test during which these buses were loaded to a minimum of 30%.
- 1) 4.16XV Bus ElB load was 20%. (Maximum available load at time of retest)
- 2) 120/208 volt distribution panel LPA435 load was 28.9% (space heaters)
Steady state voltages and loading at the necessary buses were recorded. As soon as practical, the motors selected for the transient start tests were energized, first by starting a non class lE circulating water pump motor (3500 hp) followed by (within a short period of time and after steady state conditions were again reached) a class lE high head safety injection pump motor (1000 hp) for each train. Transient voltages during these motor starts were monitored on all safety related buses except regulated 120V panels. The measured values were then analyzed using the same mathematical model used during the original voltage analysis.
The Test Results Suneary is provided in Appendix A and Simplified One Line Diagrams for the associated buses are provided in Appendix B.
Delta (A) is defined as Measured Voltage !
Calculated Voltage in % - 100% !
The worst case (most negative) A 's for the two steady state and two transient tests for each train are shown in Appendix A. The results in Appendix A are the worst case of the three supply sources to the 13.8XV bus which feeds each l train (See Appendix B). When the supply source to the 13.8XV bus is a standby '
transformer (#1 or #2), the 362.25XV switchyard bus voltage was monitored and used as the reference bus for the A 's. When the supply source is the unit auxiliary transformer, the 23XV generator bus was monitored and used as the )
reference bus for the A's, since the voltage drop thru the main step up '
transformers NT001A and NT001B is compensated for by the automatic load tap changer on the unit auxiliary transformer. As indicated in Appendix A, good correlation exists between the measured values and the calculated values for the steady state and transient portions of the test program for all trains.
The differences between the steady state measured and calculated values range from a maximum negative A of - 2.23 percent difference on bus DPB 235 and a maximum positive A of + 1.42 percent on MCC bus ElC2. Therefore, the comparison of the measured and calculated steady state values is acceptable per the criteria in BTP PSB-1.
05181/0019i
ATTACHMENT
. ST-HL AE.2739 26C4.V 0F G For the transient voltage conditions, the measured values differed from calculated values by a maximum negative 21 of - 2.99 percent on load center bus ElB2 and a maximum positive 21 of + .64 percent on 4.16KV bus EIA. This data shows good correlation between the measured and calculated values and the comparisen of the measured and calculated transient values, and is acceptable per the criteria in BTP PSB-1.
In summary, on the basis of the results of the Voltage Verification Test steady state and transient analysis, the mathematical model used in the voltage analysis is considered to have been verified as being acceptable and the original analysis did satisfactorily predict plant distribution system conditions under the various analyzed operating modes.
i I
05181/00191
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i l
ATTACHMENT
. ST HL AE #73V !
PAGE 6 0F /?
Test Results Sunenary Appendix A Page 1 of 3 Train A I
J Worst Case Worst Case Bus l Steady State A (%) Transient A (%)
13.8KV Bus IF l - .68 i - 1.18 1
I 4.16KV Bus El A + .18 + .64 l Load Center (LC) ElAl -
.97 -
.49 i (480V)
Load Center (LC) ElA2 - .21 + .33 )
(480V) i I ;
Notor Control Center -
.17 -
.62 l 1 (NCC) ElAl (480V) !
[
Notor Control Center + .48 -
.38 )
(NCC) El A3 (480V)
Notor Control Center -
.36 + .25 (MCC) ElA2 (480V) .
1 Notor Control Center -
.41 + .15 (NCC) E1 A4 (480V) l Distribution Panel - 1.87 . N/A DPA 135 (120/208V) I Distribution Panel l - 1.28 N/A l DPA 335 (120/208V) I Distribution Panel -
.68 N/A DPA 235 (120/208V) _
Distribution Panel - 1.96 N/A l DPA 435 (120/208V) l l l N/A Denotes that transient volta 9es on 120/208 volt distribution panels are not calculated and are therefore not applicable to A calculations.
05181/0019i
ATTACHMENT ST.HL.AE 913Y PAGE 6 OF /A Test Results Summary Appendix A Page 2 of 3 1 rain B Worst Case Worst Case r,u s Steady State li (%) Transient 21 (%)
13.8KV Bus 1G !
.72 -
.72 l
l 4.16KY Bus ElB - 1.02 - 1.06 i
Load Center (LC) E181 i -
.07 - 1.70 Load Center (LC) ElS2 - 1.76 - 2.59 Motor Control Center -
.52 - 2.14 (MCC) ElB1 Motor Control Center -
.67 - 2.28 (MCC) ElB3 l l
, Motor Control Center -
. 61 - 2.11 (NCC) E182 Motor Control Center -
. 61 - 1.24 (NCC) ElB4 l
Distribution Panel - 2.12 N/A DPB 135 Distribution Panel - 2.23 N/A DPB 335 1
Distribution Panel - 1.70 I h/A DPB 235 l
l Distribution Panel - 1.97 N/A l l DPB 435 l 05181/00191
-. ..-- , .,~ -. -. ..-. .
'1
. I l
ATTACHMENT
. ST HL AE #7W
. PAGE 7 OF / R Test Results Sunnary Appendix A Page 3 of 3 Train C Worst Case Worst Case j Bus Steady State A (%) Transient A(%)
13.8KV Bus lH -
.68 - 1.18 4.16KV Bus Elc -
.25 -
.79 Load Center (LC) ElCl 1.24 - 1.72 i
I Load Center (LC) ElC2 -
.54 - 1.08 l l
, Motor Control Center 1 - 1.19 - 1.66 (NCC) ElCl Motor Control Center + .63 -
.21-
, (NCC) ElC3 Motor Control Center + 1.42 + .16 (MCC) ElC2 Motor Control Center - 1.07 - 1.42 i (NCC) ElC4
( 1 Distribution Panel - 1.09 N/A j i DPC 135 l l
Distribution Panel -
.28 N/A DPC 335
[ Distribution Panel -
.60 h/A l DPC 235 l
l Distribution Panel -
. 61 N/A l DPC 435 05181/00191
. , . _, . u ._ _ _ - . , , _ . , , _ _ ~ ..-._._._._.__._.-,s.._,_.-.__-._,_.._.,_._..._._...
Simplified One Line Diagrams l
. Appendix B ATTACHMENT !
Page 1 of 5 . ST HL AE s273Y I l
PAGE.S .0F /A
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_ _ _ _ _ _ _ _ _ _ . _ _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ -_ _ _ _ _ _ _ - - _ - _ _ _ __-_m __