STUDY ON TECHNOLOGY OF HIGH DECAY HEAT FUEL HANDLING -MANUFACTURE OF DOUBLE WALL VESSEL BY THE RING HEAT SHRINK METHOD

摘要

For the stage of commercial utilization of FBRs, the decayrnheat of spent fuels to be handled is expected to be higher due tornMA containing and the higher burn up of fuel. The fuel storagernvessel with high heat transfer (f0.2m3m) and vessel integrityrnfeatures a double wall and passive air-cooling on the outsidernsurface. In order to achieve the high heat transfer performancernand the smooth carrier gas flow for checking of the vessel wallrnintegrity, the vessel is designed to have the constant and smallrngap between the double wall.rnThe vessel is manufactured by the ring heat shrink methodrn(RHS method). This method : the local area is heated annularlyrnand the adjacent sections are cooled can be applied to reducernthe diameter of outer vessel.rnThe objectives of the present study is to evaluate thernfeasibility of the fuel storage vessel with double wallrnmanufactured by the RHS method for future practical FBRrnplant.rnIn this study, the following items were studied. As a result,rnit is prospected that the concept of the fuel storage vessel withrndouble wall by the RHS method will be feasible for the stage ofrncommercial utilization of FBRs.rn(1) Vessel Manufacturbilityrn(2) Carrier Gas Flow Characteristicsrn(3) Evaluating the Economy of the Double Wall Vessel