LUNAR ELECTRIC ROVER (LER) POWER SYSTEMS SUPPORT. TELEDYNE ENERGY SYSTEMS THE RESEARCH AND DEVELOPMENT SUPPORT THAT WILL BE PROVIDED BY TELEDYNE ENERGY SYSTEMS, INC. (TESI) WILL PROVIDE NASA WITH INSIGHT INTO THE PERFORMANCE AND OPERATING CHARACTERISTICS OF THE 72-CELL NG-2000 FUEL CELL STACK THAT IS PLANNED FOR USE IN AN ANALOG DEMONSTRATION OF HYDROGEN/OXYGEN FUEL CELL POWER SYSTEMS FOR SURFACE AND STATIONARY POWER GENERATION ON EXTRATERRESTRIAL SURFACES. IN THE RECENT PAST (2005), TESI DELIVERED AN 8-KW ENGINEERING MODEL PROTON EXCHANGE MEMBRANE FUEL CELL POWER SYSTEM TO NASA AS A DELIVERABLE UNDER THE 2ND GENERATION LAUNCH TECHNOLOGIES/ORBITAL SPACE PLANE PROGRAM. AT ABOUT THAT SAME TIME, NASA WAS DEVELOPING IN-HOUSE A FUEL CELL SYSTEM THAT WAS INTENDED AS THE PRIMARY MOTIVE POWER SOURCE FOR THE SCIENCE, CREW, OPERATIONS,&UTILITY TEST BED (SCOUT) VEHICLE. FOR THAT EFFORT, NASA PROCURED A 72-CELL NG-2000 STACK FROM TESI, BUT THAT PROJECT WAS ULTIMATELY CANCELLED. AN IN-HOUSE RESEARCH AND DEVELOPMENT EFFORT INVESTIGATING EJECTOR-BASED REACTANT CIRCULATION PUMPING WAS COMPLETED IN 2008, AND THE FINAL PRODUCT WAS A FUEL CELL OPERATIONAL VERIFICATION TEST BED, WHICH INCLUDED THE ORIGINAL SCOUT FUEL CELL STACK. THIS FUNDED EFFORT (NNJ10HB54P/ PR 4200329489/LER POWER SYSTEMS SUPPORT) IS INTENDED TO ALLOW FOR THE TEST ARTICLE EXPERTISE AVAILABLE FROM THE ORIGINAL NG-2000 STACK MANUFACTURER (TESI) TO BE AVAILABLE TO THE NASA FUEL CELL SYSTEM DEVELOPERS AS THE SYSTEM DESIGN AND TESTING PROGRESSES TOWARDS COMPLETION. THE LER (LUNAR ELECTRIC ROVER) FUEL CELL POWER SYSTEM WILL INCORPORATE EJECTOR REACTANT CIRCULATION PUMPS. THE USE OF EJECTORS FOR REACTANT CIRCULATION PROVIDES A FUNDAMENTALLY DIFFERENT FLOW REGIME OVER THAT PROVIDED BY MORE COMMONLY USED ELECTRICALLY-DRIVEN MECHANICAL CIRCULATION PUMPS (DIAPHRAGM, VANE, CENTRIFUGAL, ETC.).