8. 61 during or after colony construction, since the machine tools used in manufacturing are sized to the work piece rather than to their output. This is a necessary inefficiency. 5. Assembly using threaded fasteners (bolts) is necessary due to the difficulty in maintaining the alignment of large surfaces of complex curvature in free space during welding. 6. The high power requirements of the construction process (60 MW) suggest that the construction site have its own temporary power plant. 7. The long lifetime and high safety requirements of the prototype colony necessitate strenuous inspection requirements during manufacture and assembly and continuous monitoring of the structure during use. 8. Existing inspection methods should be adequate to meet the design requirements. This study concentrated on ultrasonics because of its proven industrial flexibility and capability of being readily modified for use in the space construction environment. 9. The compartmented hull design is highly advantageous for structural monitoring and repair. Detection of leaks and structural failures can be accomplished by an extremely simple pressure monitoring system. Since damage can be confined to a single compartment, repair requires no special equipment except for a simple portable air lock.
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