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The Electron-VM Oxygen Generation System (OGS) is a main source of oxygen for crew breathing on the International Space Station (ISS) and the result of updating the Electron-V OGS that has been in successful operation for 17 years on Mir Space Station. The successful accomplishment of a manned flight program primarily has resulted in the stable operation of the system. The paper deals with analysis of off-normal situations related to the operation of the Electron-VM on board ISS. The system switching-off analysis based on the telemetry information processing and the results of the additional tests conducted under flight and ground conditions is performed. A principal cause of system switching-offs is a reduction in the pressure built by the circulating pumps due to ingress of gas bubbles into the suction pipeline. The results of the Electron-VM OGS switching-off analysis and the practical recommendations regarding its prevention are reviewed.

The report addresses the actions that are to be taken to assure complete safety of oxygen supply systems operation along with electrolysis units. The paper is based on over the 30-year experience gained in design, development, testing and flight operational use of the Russian space vehicles that currently made it possible to develop and successfully operate the long-duration service life oxygen supply systems.

The report is based on the activities conducted at S.P.Korolev RSC Energia supporting to the Mir space station. Mir has been flying since February 1986, with more than 8,5 years being in the manned mode of operation. The report addresses the gas composition requirements of the Gas Composition Support Aids (GCSA), operational data on the atmospheric composition and information about individual gas composition support aids.