ML20236G904
| ML20236G904 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 07/24/1987 |
| From: | Estes T EIGEN ENGINEERING, INC. |
| To: | |
| Shared Package | |
| ML20236G897 | List: |
| References | |
| SMD-1035-87-004, SMD-1035-87-004-R00, SMD-1035-87-4, SMD-1035-87-4-R, TAC-56525, NUDOCS 8708040417 | |
| Download: ML20236G904 (13) | |
Text
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E GEN ENGINEERING,INC PRELIMINARY RESULTS Test Of CCU/CSU Interface Devices For Data Acquisition System (ANATEC)
Document Number SMD-103 5-87-004, Rev. O Design Record File Number:
SMD-103 5 Prepared For:-
Sacramento Municipal Utility District Rancho Seco Nuclear Generating Station Prepared By:
Timothy E. Estes Senior Engineer g*nulFah*
e P
3150 ALM DEU kXPRESSWAY, SUITE 233'. SAN JOSE, CALIFORNIA' 95118. (408) 978 8113
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0 TABLE OF CONTENTS l
PAGE
1.0 INTRODUCTION
1 2.0 TEST
SUMMARY
1 i
2.1 120 and 180 Ohm,1/4 W. Resistors 1
2.2 47 ohm, 1/4 W. Resistor 3
2.3 Transistor / Resistor Network 3
LIST OF TABLES TABLE 1 - PRELIMINARY CCR/CSU INTERFACE TEST RESULTS 120 Ohms.
5 TABLE 2 - PRELIMINARY CCR/CSU INTERFACE TEST RESULTS 180 Ohms.
6 TABLE 3 - PRELIMINARY CCR/CSU INTERFACE TEST RESULTS 47 Ohms.
7 TABLE 4 - PRELIMINARY CCR/CSU INTERFACE TEST RESULTS TRANSISTOR / RESISTOR NETWORK.
8 LIST {0FFIGURES FIGURE 1 - TEST SETUP FOR MCV TEST OF 120 & 180 OHM RESISTOR INTERFACE.
9 FIGURE 2 - TEST SETUP FOR MCV TEST OF TRANSISTOR /
RESISTOR INTERFACE.
10 FIGURE 3 - TEST SETOP FOR MCV TEST OF 47 OEM RESISTOR INTERFACE.
11
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EIGEN ENGINEERING, INC.
i SMD-103 5-87-004 REV. 0 4
1.0 INTRODUCTION
This document presents in summary form, the preliminary l
results of testing of the following Anatec. Data Acquisition System, CCU to CSU interface associated components:
l A.
120 ohm, 1/ 4 W.
resistor to +5 VDC power supply B.
180 ohm, 1/ 4 W.
resistor to +5 VDC power supply C.
47 ohm, 1/4 W.
resistor to +8.5 VDC power supply D.
Transistor / Resistor network to +8.5 VDC and +5 VDC power supplies.
i The following section will provide the Maximum credible Voltage (MCV) values, point of application, output values, functionality of the device af ter testing, for each isolation device tested.
All signals were recorded on a8 channel strip chart recorder.
Test inputs were applied for 1 to 2 seconds.
2.0 TEST
SUMMARY
2.1 120 and 180 Ohm, 1/ 4 W. Resist;.gIA (Figure 1)
Each resistor was tested using a High-Level Analog Input Multiplexer (MUX) circuit board to provide the +5 VDC for testing.
The normal DC source for the interface components comes from a power supply c~ontained on the same circuit board as these components.
The MUX circuit board was used to determine the ef fects of an applied MCV on that board 5 VDC power supply and the +8.5 VDC feeding it.
The resistor (120 or 180 ohm) was ef f ectively inserted across the +5 VDC to common gound..
The MCV of at least 120 VAC RMS was applied between the resistor and ground.
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2.1 120 and 180 ohm. 1/ 4 W. Resistors (Continued)
Test resulta show the following:
A.
When the MCV was applied between the test resistor and ground, the test resistor opened due to.overcurrent within 10 milliseconds or less.-
This resulted in sharp voltage spikes, of the same duration, being felt in the - +5 VDC and +8.5 VDC power supplies.
The on-board.+5.VDC or the +8.5 VDC power supply.were not effected by this surge.
Af ter the resistor opened, the-power supplies returned to normal levels.
A 0.1..
volt peak-to-peak ripple, 'found on strip chart traces of the +5 VDC and +8.5 VDC af terwards, is felt to be the result of induced voltages f rom ' the test leads used.
The ripple disappears when the 120 VAC MCV is turned off.-
B.
For the 120 ohm resistor test, the maximum voltage spike felt on the +5f VDC was 2.2 volts peak-to-peak-and:of 10 millisecond. duration.
For. the +8.5.VDC, the g
maximum spike was 1.2 volts peak-to-peak and of 5 millisecond ~ duration.
(see Table 1)
C.
For the 180 ohm resistor test, the. maximum voltage spike seen on +5 VDC was 2.5 volts peak-to-peak and 10 millisecond duration.
The maximum spike on the +8.5 VDC power supply was 1.3. volts peak-to-peak and of 5 millisecond duration.
(See' Table 2)
D.
A six minute. run, using a 180 ohm resistor, with MCV applied, showed no deterioration. of +5 VDC and
+8.5-VDC power supplies over the run period.
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2.2 47 ohm, ' 1/ 4 W.
Resistor (Figure 3)
For this test, a 47 ohm resistor was essentially placed across a +8.5 VDC power supply output.
A MCV of at least 120 l
VAC was input between the test resistor and common ground.
Test results show the following:
A.
When 120 VAC was applied, the 47 ohm resistor opened within 15 milliseconds.
This caused the +8.5 power supply to see a maximum 2.0 volt peak-to-peak fluctuation lasting for 0.2 seconds.
The +8.5 VDC then returned to normal level.
(See Table 3)
I B.
A 0.25 volt peak-to-peak ripple, seen on the +8.5 VDC l
level after the resistor opened, appears to'be ind'u'ced I
k into the circuit by test leads used.
It disappears when the MCV is turned off.
L 2.3 Transistor / Resistor-Network- (Figure 2) 4 A bread-board circuit was fabricated to simulate this interface circuitry.
An MCV of 120 VAC or greater was applied between the transistor collector and common ground.
The effects of the' MCV was monitored at the +5 VDC and +8.5 VDC power supplies, transistor base voltage, the voltage drop across the 47 ohm resistor, and the logic input line to the circuit inverter.
i l-1 EIGEN ENGINEERING, INC.
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2.3.
Transistor / Resistor Network (Continu@d) g s
i Test results show the follow ng:
A.
T 7 and 16 0 ohm resistors opened or fectively)
.openefwithin5millisecondsoftheMCVappihion.
LJ B.
The transistor shorted internally. between collector, emitter and base within the above 5 milliseconds.
C.
The maximum spike felt by the +5 VDC power supply was a = 0.5 volt peak-to-peak fluctuation of 5 millisecond duration.
The +8.5 VDC power supply felt a 0.7 volt peak-to-peak fluctuation of 5 millisecond duration.
Both power supplies return to normal levels af t'er the fluctuations.
(See Table 4)
D.
The 750 ohm resistor opened af ter 1.02 seconds with some signs of overheating.
E.
During this.1.02 second period, the logic input to the inverter experienced'a 1.5 volt peak-to-peak spike for 5 milliseconds and then a 0.45 volt peak-to-peak sine wave of 60 Hz for the remainder of the 1.02 seconds.
This ended when the 750 ohm resistor opened.
i EIGEN ENGINEERING, INC.
4 of 11 SMD-103 5-87-004 REV. 0 m,
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TABLE 1 Preliminary CCR/CSU Interfcca Test Results
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