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SUMMARY TheNASA-U4LMSCElectrolyticOxygenGeneratorwhichwasprovidedby 2LMSC as the back-up water electrolysis system for the NASA-McDonnell Douglas (MDAC) 90-Day Manned Test was refurbished, improved and subjected to a 182-day bench test at the MDAC facility in Huntington Beach, California. Prior to delivery of the system to the test site, a program effort was accomplishedwhich consisted of re-assembly and installation of components (all componentswiththeexceptionoftheelectronicshadbeendisassembledforpost- test evaluation after the 90-Day Test), incorporation of design improvements indicated by the results of the 90-Day Test, performance of a 50-hour checkout and 100-hour acceptance test, and documentation of the system configuration, operating instructions and test results. The test plan for the 182-Day Test at MDAC required system operation at the nominal design point (3.63 kg/day (8 lb/day) oxygen output) except for a one week period of orbital simulation and a five-week period at the maximum design oxygen output rate of 4.55 kg/day (10 lb/day). All of these test condi- tions were successfully met by the system. The system operated for 160 cumulative days of the 182-Day Test period (88 percent on time) and was shut down on weekends or awaiting replacement parts for 10 days. The remaining 12 days of normal working shift (96 hours) were required for fault diagnosis and repairs. The system was shut down a total of24times,13timesbecauseofprimaryfailuresormalfunctions,andll times fordiagnosticpurposes. Overhalfofthetotalnumberofshutdownsandtwo- thirds of the primary shutdowns were related to an intermittent malfunction of a single electronic component. No cell or module failures of any kind occurred, and no shutdowns were caused by interface problems or operator error. The performance of the system during the test demonstrated the soundness of the basic electrolysis concept, the high development status of the automatic controls which allowed completely hands-off operation, and the capability for orbitaloperation. Thefollowingdesignimprovementswereindicatedbythe test experience: xiPDF Image | WATER ELECTROLYSIS SYSTEM REFURBISHMENT
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