The deformation analysis of JOYO core support-plate for the fast reactor safety characteristic research

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As the factor which affects the reactivity coefficient, there is a thing by the change of the flow characteristic of the core internal structure by the mechanical deformation. This displacement of core support-plate in the JOYO reactor vessel was analyzed by using "FINAS" (Finite Element Nonlinear Structural Analysis System). This displacement is a result of the coolant loading difference between the shutdown and full operational primary flow rates. The displacement of core support-plate in the JOYO reactor vessel was analyzed by using "FINAS" (Finite Element Nonlinear Structural Analysis System). This displacement is a result of the coolant loading difference between the shutdown and full operational primary flow rates. At first, the deformation of the core support was required according to the two-dimensional axisymmetric model. These displacements were used as input in the three-dimensional models of excluding the support rib. As a result, the displacement of the upper core support-plate would be about +0.39mm in the center and the maximum would be about +0.43mm in the fifth row. Because of the displacement of the support-plate was suppressed by the support rib. The whole core support structure was displaced in the upward direction. And, core support-plate of the upper and lower was spread largest about 0.03mm in the tenth row by the high-pressure plenum coolant loading.