The Outpost Precursor Testbed for ISRU and Modular Architecture (OPTIMA) project is a collaboration between industry and NASA partners for development and demonstration of in-situ resource utilization (ISRU) technology. The Precursor In-Situ Lunar Oxygen Testbed (PILOT) program executed by Lockheed Martin demonstrated an end-to-end oxygen production system starting from regolith simulant and producing pressurized oxygen as part of the OPTIMA project. A field demonstration took place in November

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... 2008 at an analogue lunar field environment at the recently created Pacific International Space Center for Exploration Systems (PISCES) facility in Hawaii. This paper will discuss the design and field test results of the full scale hydrogen reduction reactor, and the lessons learned from the field demonstration. Nomenclature ISRU = In-Situ Resource Utilization kg = kilograms kW = kilowatt psia = pressure per square inch absolute sccm = standard cubic centimeters per minute slm = standard liters per minute 1 Lab Manager, Spacecraft Technology Development Laboratory, M/S P-0560 PO Box 179 Denver, CO 80201. electrolyzer subsystem in order to simulate a closed loop system. The purpose of this paper is to focus on the hydrogen reduction process using a rotating reactor with external heating and the resulting benefits and limitations of the system.