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ESA Document - Emits - ESA

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HMM<br />

Assessment Study<br />

Report: CDF-20(A)<br />

February 2004<br />

page 148 of 422<br />

The overall compound of the module and the two nodes can be divided into the three basic<br />

habitation zones, as shown in of Figure 3-23. The main translation movement is visible through<br />

the red arrows.<br />

Two main aspects have been taken into consideration with regard to safety:<br />

The overall configuration is based on a fail-safe main module. Only the stormshelter has airtight<br />

hatches. The main cylinder is already partitioned into three zones, which can be used<br />

independently in case of emergency. Furthermore the use of the MEV and the ERC nodes<br />

provides additional safe compartments.<br />

Special precautions have to be taken with respect to fire, toxic contamination etc. It is therefore<br />

assumed that a fire detection system, a fail-safe isolation and recovery system is implemented.<br />

Batteries should be positioned outside, adjacent to the solar panels, and the oxygen/nitrogen<br />

tanks should be also positioned outside the pressurised volume.<br />

© LIQUIFER<br />

Figure 3-23: Baseline design overview – drawing of measurements<br />

The back node is mainly a translation space to the ERC and the airlock where three space suits<br />

are stored. This habitable space is considered as more isolated than other spaces therefore the<br />

hygiene facilities are located in the personal zone. There are two hygiene facilities, one for backup<br />

and the other one for daily use. The space towards the propulsion is used as storage space<br />

although all AOCS systems, batteries, and the propulsion tanks are positioned outside to prevent<br />

the inhabited space from being polluted by dangerous fluids or gases. The tanks are positioned<br />

around the EVA hatch for easy access in case of an emergency. The ISS-type orientation allows<br />

a maximum use of the space with these dimensions of the node. Additionally the complex<br />

hygiene facilities used on the ISS today can easily be improved without applying the latest<br />

technology on the basic volume and hardware on the existing structure. See Figure 3-24 :

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