Table 4.34 Side-by-Side Comparative Assessments: Resources Land Materials Energy Water Labor Requirements Small plant requirements Mining impacts are the main problem Good supply of coal Payback about on year Contaminat ion due to coal mining Skills available today Small plant requirements Some mining impacts Uranium supply is limited Payback about one year Small cooling losses Small but highly-skilled operations and maintenance force Small plant requirements Slightly less mining impacts than conventional coal Good supply of coal Payback about one year Mining impacts smaller than those of conventional coal Small cooling losses Skills available today Smaller impacts than LWR due to smaller mining requirements More efficient use of uranium supply than LWR Payback about one year Small cooling losses Small but highly-skilled operations and ma intenance force Large land areas required for solar collectors Seven potential problem materials identified Payback3 for Si system about 19 years High energy intensity of cell product ion No impact Negligible water use Skills readily available Large, contiguous rectenna sites Three problem materials identified (mercury, tungsten, gallium) Payback for Si about six years; Ga about one year Less sensitive to energy intensity of cells No impac t Negligible water use Space construction requires new and highly-skilled work force Small plant requirements Lithium supply could be a constraint Not evaluated Comparable to LWR Construction requirements similar to LMFBR
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