A critical aspect of the MPALSS system is to provide life supporting atmosphere
for a stranded astronaut for the extended mission time frame. Life supporting
atmosphere consists of 2 primary components: supply of oxygen and removal of
carbon dioxide.

The Mars Habitat provides atmosphere through the Oxygenator. The Oxygenator
functions by separating the gas atmosphere in a chemical reaction to multiple
components including carbon dioxide, water vapor, and other trace components.
The water vapor is then condensed to liquid water, filtered, and then separated
into hydrogen and oxygen through electrolysis. The gaseous oxygen is then
crygenically cooled to liquid form before being stored in tanks for later use.

The Oxygenator system diagram is show below:
Oxygenator System Diagram

The current Oxygenator system is designed with singular components for each
item in the diagram. Each of the Oxygenator components is manufactured to meet
a specific failure rate. The overall system system is designed to meet the
standard Mars Surface Mission duration time with a 2 - 3 time buffer.
The MTBFs for each component is provided in the following table:

Component MTBF
Atmospheric Sensor 50,000 hours
Pump 20,000 hours
Valve 40,000 hours
Hydrogen Tank 100,000 hours
Reactor Chamber 30,000 hours
Condenser 30,000 hours
Gas Membrane 40,000 hours
Coolant Lines 100,000 hours
Coolant Radiator 100,000 hours
Water Filter 30,000 hours
Water Electrolyzer 30,000 hours
Crygenic Cooler 30,000 hours
Liquid Oxygen Tank 100,000 hours


As part of the MPALSS system proposal, provide a full RMA analysis of the
Oxygenator system. The RMA analysis shall show the statistical analysis
to determine the MTBF for the current system design.
The analysis shall propose a redesigned Oxygenator system to achieve the MTBF
required for the MPALSS extended mission duration.
The redesigned system shall contain the same system components as the original