with MoRe clad UN fuel pins [3], a redundant conversion system consisting of four Brayton loops operated at a turbine inlet temperature of 1400 K [4], and a mercury/ steel heat pipe non-deployable radiator [5]. Work carried out at this stage included conceptual design studies, analysis of the reactor control system, and of normal and accidental transients [6]. Mid-1986 to 1989: establishment of the technical and economical bases for the development of nuclear SPS. This present phase comprises: —Continuation of the studies on the 200 kWe reference system for improving the preliminary design (mass optimization and sensitivity studies), investigating design alternatives and evaluating a gas-cooled reactor with direct conversion. —Comparative study of three candidate nuclear source technologies for driving 20 kWe turboelectric SPS [7, 8, 11]. This study includes: (i) conceptual design of the whole power systems (with the assistance of Aerospatiale for the general system layout, overall integration and components space qualification; (ii) preliminary design of critical components contracted to industry: turbogenerator (Alsthom/Rateau, Turbomeca, Auxilec), control drums and safety rods actuators (Sagem);
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