Abstract
In the "Feasibility Study on Commercialized Fast Reactor Cycle Systems", an innovative concept of a sodium-cooled loop-type reactor to pursue high economic competitiveness has been developed by adopting several innovative concepts. For one of the concepts, 12Cr-steel with high strength and low thermal expansion rate has been employed as a structural material of the primary piping. As a result, the diameter is enlarged and length is shortening and the cooling system has been remarkably simplified. For the design concept of the hot leg piping, it is designed as a simple L-shaped top-entry type piping selected on the view point of economical and technical issues. And the structural integrity against a thermal stress and the instability of the vibrations of primary piping are evaluated.
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