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This paper describes the experimental results and discussions on the changes in dimension, volume and thermal expansion coefficient of five nuclear grade graphites which were made from petroleum coke or gilsonite coke and irradiated in the JMTR a t 670--1,26O0C UP to the maximum neutron fluence 3.3 x lo2' n/cm2 (E>0.18 MeV).Dimensional or volume shrinkages for all samples were observed after irradiation and their changes depended on the kind of graphite studied. T h e changes in thermal expansion coefficient were also observed for three of five samples.The relations between the changes in dimension or volume and thermal expansion coefficient were obtained, and it was clarified that both the rates of irradiation shrinkage in dimension and volume of the sample having larger thermal expansion coefficient were smaller than for the sample having smaller thermal expansion coefficient.

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