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<br />17 <br /> <br /> <br />~ average conditions over the period. Also, in view of the long-time <br />00 <br />00 period and the attending uncertainties involved, further refinements <br />"',) <br /> <br />reflecting different levels of technology for various specific <br /> <br />installations would not be expected to enhance the accuracy of <br /> <br />the projections at this time. <br />The nuclear reactors are assumed to be of the fast breeder <br /> <br />type. This reactor concept is an advanced type and will require <br /> <br />'further development, testing, and demonstration. The Atomic Energy <br /> <br />COlnmission, American industry, and forei~n countries have extensive <br /> <br />programs for the development of fast breeder power reactors using <br /> <br />various designs. Emphasis is being directed toward development of <br /> <br />thls type of reactor because it is predicted that its use will be <br /> <br />essential to permit the nuclear industry to achieve the expansion <br /> <br />projected by the end of this century. <br /> <br />Development of high-gain breeder reactors will increase the <br /> <br />efficiency of fuel utilization. This wi 11 have the effect of <br /> <br />permit;ting the economic use of lower grade uranium ores) and will <br /> <br />thereby extend the available resources. The breeding feature <br /> <br />results in very low fuel cycle costs, and hence these reactors <br /> <br />have a potential for producing low cost heat and power. <br /> <br />The design used for cost estimates in this report is based <br /> <br />upon those developed by the Argonne National Laboratory in 1966 <br /> <br />for a sodium-cooled, fast breeder reactor. The Atomic Energy <br /> <br />CDllli1lission provided base estimates for two 5,OOO-megawatt thermal <br /> <br />(mwt) reactors at a single station. Because of the time period <br /> <br />involved, the individual sizes may be smaller Dr larger. The use <br />