Status of the Advanced Oxygen Generation Assembly

Future Exploration missions will require an Oxygen Generation Assembly (OGA) to electrolyze water to supply oxygen for crew metabolic consumption. The system design will be based on the International Space Station (ISS) OGA but with added improvements based on lessons learned during ISS operations and technological advances since the original OGA was designed and built. The goal of these improvements will be to reduce spares mass and crew maintenance time while increasing reliability. These improvements will be incorporated into the Advanced OGA (AOGA), which will be launched to ISS in 2026 and its operation demonstrated in a relevant flight environment for at least 3 years. AOGA upgrades include: redesign of the electrolysis cell stack, redesign of the hydrogen dome, replacement of the hydrogen sensors, redesign of the recirculation loop deionizing bed, and incorporation of recirculation loop nitrogen purging and water flushing. AOGA design reviews, analyses, and development tests are now complete. Currently, AOGA flight hardware components are being manufactured. The design, build and plans for the AOGA will be reviewed in this paper.