Development of a numerical simulation system for detailed thermal hydraulics in a fast reactor fuel assembly, 8; Coupling method of thermal-hydraulics with fuel deformation

Ohshima, Hiroyuki; Uwaba, Tomoyuki ; Hashimoto, Akihiko*; Imai, Yasutomo*

A numerical simulation system is being developed in order to offer methodologies to clarify thermal-hydraulic phenomena in fuel subassemblies of sodium-cooled fast reactors under various operating conditions such as normal operation, transient condition or deformed geometry condition from the viewpoint of the assessment of fuel pin structure integrity. As a part of this simulation system development, a coupling method of thermal-hydraulic analysis with fuel deformation analysis was implemented and was applied to a high burn-up fuel assembly analysis for the method verification.