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Thermal analysis on shipping cask for JSFR fresh fuel

Kato, Atsushi ; Chikazawa, Yoshitaka ; Uto, Nariaki ; Hirata, Shingo; Obata, Hiroyuki*

A basic feasibility of the helium gas cask has been evaluated by thermal analyses. There have been conducted two analyses: whole cask and detail inside subassembly analyses. The detail inside subassembly analysis has shown that the temperature distribution is mainly governed by thermal conductivity and natural convection of coolant helium hardly contributes heat removal. In the case of a cask with five subassemblies with 2.2 kW decay heat per each, the maximum cladding temperature is evaluated to be 361 $$^{circ}$$C satisfying cladding temperature limit of 395 $$^{circ}$$C. Those results have shown the basic feasibility of the helium gas fresh fuel shipping cask.

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