The strain criterion of the liner material of the secondary coolant system of Monju

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Based on the lower limit of high temperature tensile and bending test results of SM400B, a criterion of strain for the Monju liner was proposed: Membrane and bending strain : m + b m+ b 15% RTT350C m+ b 30% 350CT1000C This criterion must be applied with considering the following reference value for membrane strain, in order to prevent instable fracture arising from necking. This reference value was determined based on uniform elongation obtained by high temperature tensile tests. Membrane strain : m m 5% RTT350C m 10% 350CT1000C The liner is subject to multiaxial stress state under temperature history due to heating by contacting to high temperature sodium and subsequent cooling. It was shown that the above strain criterion was valid under such circumstances, including other factors that could affect material properties.