out the various types of occupational health hazards and discuss their associated impacts, instead of estimating PDLs for occupational injuries and illnesses. The types of work unique to the SPS are space fabrication and construction in LEO and GEO. and space operations and maintenance in both LEO and GEO. The total estimated manpower for such unique occupations amounts to 62.5 thousand man-years, while the total estimated manpower for the overall SPS Scenario A is 44.579 million man-years. Thus only 0.14% of the total SPS system manpower encounters unusual health hazards because of the unique working environment. The potential hazards are described in more detail in Section V.
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