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of this pump, it was noted that the pump housing endplate was constructed of thin aluminum protected only by a Teflon washer. This endplate was changed to stainless steel, thereby eliminating a cause of corrosion and a structural weakness in the coolant pump. This pump is now undergoing testing in the OGS. Control and Sequencing Improvements The following control and sequencing problems were evaluated and improved * Current control modifications * OGS water tank fill sequence Current Control Modifications The SFWEM test system electronic Control and Monitor Instrumentation (C/M I) was thoroughly bench-checked to determine the (5) causes of occasional current drift observed during previous endurance testing The following problems were identified 1. Acompensatingcapacitorhadbeguntoleakcausingagainchangein the current control amplifier. This resulted in a slow downward drift of the current 2. Anintegratedcircuitoperationalamplifierwasfoundtobeexcessively temperature sensitive which resulted in current fluctuations 3. Thecurrentcontrolpotentiometerwasfoundtohaveworncontacts resulting in erratic settings. 4. Theleadscarryingthehighcurrentfromthegroundsupportpower supply to the power converter had to be shielded to reduce the 60 Hz noise coupling to low level control circuits. S The low level signal leads from the system transducers had to be shielded to reduce potential 60 Hz noise pickup These problems were corrected and the C/M I package was than operated for 90 days using a simulated OGS complete with resistors to simulate controlled and monitored parameters Tables 6 and 7 list the controlled and monitored param eters, respectively, simulated for the checkout tests. Following the testing, the C/M I was returned for operation in the test system with a high level of assurance that no system shutdowns would originate from the C/M I package OGS Water Feed Tank Fill Sequence After studying the results of the 90-day endurance test, (b)and other tests run on the OGS, a slight SFWBM performance degradation was noted after each water fill sequence. To determine the cause, the three module outlet pressure levels (points 1, 2 and 3 in Figure 8) were monitored during a fill sequence using a chart recorder. Figure 8 5hows the observed pressure levels versus time while op2rating at 1089 kN/m (158 psia). As can be seen in the figure, a 158 kN/m (23 psi) 23 Lie Systems. Inc.PDF Image | STATIC FEED WATER ELECTROLYSIS PROCESS
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