ML021300556
| ML021300556 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 01/28/2002 |
| From: | TXU Generation Co, LP |
| To: | Mortensen K Office of Nuclear Reactor Regulation |
| References | |
| Download: ML021300556 (5) | |
Text
COMANCHE PEAK STEAM ELECTRIC STATION UNITS 1 AND 2 DOCKET NOS. 50-445 AND 50-446 TXU GENERATION COMPANY LP FAX RECEIVED BY K. MORTENSEN (NRC STAFF)
JANUARY 28, 2002
JAN-28-2002 MON 03:16 PM LICENSING P. 02/05 Test Report for ARD & AR Relays TXU - CPSES TR-032009-1, Rev.1 TABLE OF CONTENTS 1.0
SUMMARY
OF RESULTS 2.0 IDENTIFICATION OF TEST SPECIMENS & TEST LOADS 2.1 TEST SPECIMENS 2.2 TEST LOADS 3.0 TEST SET-UP AND TEST RESULTS 4.0 ANOMALIES 5.0 MEASUREMENT & TEST EQUIPMENT 6.0 QUALITY ASSURANCE
7.0 REFERENCES
APPENDICES APPENDIX A:
Test Data Sheets for Test #1 and Test #2 APPENDIX B:
Contact Resistance Test Data, Plots & Test Set-up Pictures APPENDIX C:
Temperature Test Data APPENDIX D:
Anomalies APPENDIX E:
Test Plan TP-032009-1, Rev.5.
FAX NO, 2548976573
JAN-28-2002 MON 03:16 PM LICENSING P. 03/05 Test Report for ARD & AR Relays TR-032009-1, Rev. I TXU - CPSES Page 1 1.0
SUMMARY
OF RESULTS The relays as identified in Section 2.1 provided by TXU - CPSES were cycled under the loads identified in Section 2.2 for a period of 1000 cycles each. The test results for each of the contacts on each relay showed little degradation of the contacts after 1000 cycles. This is evident from the contact resistance readings calculated from the voltage and current readings recorded at cycle number 1,100, 200, 300, 500 and 1000. The loads are shown in Appendix B.
Anomaly #1 is written on Load 5 for Test #1 using the DC relay (ARD88OUR) during the 300t" cycle. Due to the bad plot from the oscilloscope, the plot was not readable and the reading was not taken. However, the readings from the other cycles showed no inconsistencies in the contact resistance for Load 5. The anomaly is contained in Appendix C.
Anomaly #2 is written for the different torque values used instead the stipulated torque value in the test plan. This was due to the different size of screws on the termination points. The anomaly is contained in Appendix C.
Based on the positive test results, the ARD and AR relays can properly operate the specific loads identified in Section 2.2 for a minimum of 1000 cycles. Although it was not a purpose of the test, the contact resistance readings supported a conclusion that the loads could be properly operated for a significantly more operations.
2.0 IDENTIFICATION OF TEST SPECIMENS & TEST LOADS 2.1 Test Specimens The following test specimens are provided by TXU - CPSES. The testing was conducted at the NLI Fort Worth facility:
Relay, 8 NO, 120Vac coil, with screw terminals 2.2 Test Loads There are six test loads applied using the ARD relay and five test loads using the AR relay. The first five test loads are the same for both relays. The test loads are as follows:
LOAD#
Test Load Description Manufacturer Part #
1 Solenoid Valve GE 128C298AA-1 TXU TSN: 150562 "2
6.9kV Breaker Close/Trip coil ITE Siemens RP 6.2.2.8-2/7 Energy TXU TSN: 157070 3
480V SWGR Spring Release Westinghouse 3752A03G02 Device, 125Vdc TXU TSN: 291745 4
480V SWGR Shunt Trip Westinghouse 1A33593G04 TXU TSN: 381153 5
480V MCC Breaker Shunt Trip Coil GE TEDST12LS TXU TSN: 290567 6
AR880AR Relay Coil Westinghouse Coil on AR880AR Relay See Note 1 FA NO, 2548976573
JAN-28-2002 LION 03:17 Pli LICENSING FAX NO. 2548976573 P. 04/05 I
S Test Report for ARD & AR Relays TR-032009-1, Rev.1 ITXU - CPSES Page 2 Note 1:
This load is applicable only for Test #1 using the ARD88OUR relay.
2.0 TEST SET-UP AND TEST RESULTS The test set-up for each relay was performed in accordance with the electrical wiring diagram as described in the test plan.
All interface hardware such as cables and terminal lugs were per the test plan.
All terminations were torqued to values for the size of the termination screw and recorded in the test data sheets in Appendix A. See anomaly for torque values.
Pictures of the test set-up are contained in Appendix B.
Calibrated multimeters were used to monitor the ttoltage across each contact-and voltage across the resistor for each load. The resistance of the resistor was pre-determined based on the load current required for each load.
The resistor values are shown in Appendix B for each load. The relays were energized at 125Vdc for the DC relay and 120Vac for the AC relay.
The contact resistance for each load using each of the relays were determined by computing the current through the resistor and using Ohm's law.
Contact resistance = Voltage across contact / Current through resistor As for loads 2,3 & 4, the loads are DC coils which show voltage readings from the time it is energized and the plots shown in Appendix B are consistent with this type of loads. As for the rest of the loads, they are described as follows:
Load 1:
The solenoid valve contains two coils; a starting coil and holding coil. The coils are wired in parallel to each other. In addition, there is capacitor and contact circuit in between these two coils. When voltage is first applied to the solenoid, the starting coil picks up and charges the capacitor. The starting coil drops out when the contacts opens and the holding coil is energized and remained energized. This may explain the voltage readings during the cycling test and the plot in Appendix B for Load 1.
Load 5: As the voltage is applied to the shunt trip in the circuit breaker, the current is cut-off due to the presence of a build-in contact in series with the shunt trip. This is consistent with the voltage readings recorded during the cycling test. See the plot in Appendix B for Load 5.
Load 6: This load is only applicable to the DC relay. The AC relay 120Vac coil was energized through the contact on the DC relay. The plot shows AC sinusoidal voltage waveforms for both the voltage across the contact and the voltage across the resistor. The contact resistance was computed using the Vrms/Irms values. The rms values were calculated by determining the peak values of the sinusoidal waveforms and multiplying the values by 0.7071.
The values that are out of scale or with polarity conflicts are not considered in the computation of the contact resistance values.
JAN-28-2002 MON 03:18 PH LICENSING FAX NO, 2548976573 r Test Report for ARD & AR Relays TR-032009-1, Rev. I TXU - CPSES Page 3 Below is the summary table of the average contact resistance values for each relay contact using the loads as specified in Section 2.2.
DC Relay ARD88OUR Contact Resistance ((I)
No. of Cycles Load I Load 2 Load 3 Load 4 Load 5 Load 6 1
0.127 0.237 0.534 0.541 1.330 0.064 100 0.131 0.271 0.532 0.555 0.984 0.067 200 0.136 0.250 0.550
&.552 1.050 0.024 300 0.133 0.253 0.543 0.589 Bad plot 0.029 500 0.134 0.278 0.596 0.553 1.070 0.031 1000 0.129 0.243 0.568 0.553 1.080 0.035 AC Relay AR880AR
_Contact Resistance (0)
No. of*Cycles Load I Load 2 Load 3 Load 4 Load 5 1
0.140 0.260 0.535 0.538 1.080 100 0.133 0.221 0.555 0.610 1.030 200 0.127 0.250 0.588 0.577 1.040 300 0.137 0.250 0.620 0.631 1.040 500 0.130 0.295 0.598 0.552 1.050 1000
- 0. 124 0.266 0.585 0.603 1.060 In addition, temperature readings were taken to ensure that the contacts do not overheat during each cycle. The relays were energized for at least 1 second and de-energized for a period of 90 seconds.
The delay period of 90 seconds before energizing the relay for the next cycle is sufficient since the temperature readings showed no significant change.
A copy of the temperature readings are contained in Appendix C.
4.0 ANOMALIES Two anomalies were recorded for this test program. Details of each anomaly are contained in Appendix D.
5.0 QUALITY ASSURANCE All activities have been performed in accordance with the NLI Quality Assurance program, which is in compliance with 10CFR50 Appendix B, 10CFR21 and ASME NQA-1 [7.3].
6.0 MEASUREMENT & TEST EQUIPMENT All measurement and test equipment used to record the test data are documented in the test data contained in Appendix A.
7.0 REFERENCES
7.1 TXU Electric Purchase Order S 0334543 6D1 and attached test requirements.
7.2 NLI Test Plan TP-032009-1, Rev.5.
P. 05/05 7.3 NLI Quality Assurance Manual, Rev. I dated 7/23/91.