Abstract
This paper provides a refined analysis of a previous study concerning a method of stress analysis for irradiated graphite which may be used for molten salt breeder reactor (MSBR) core design. The present method includes the effect of a variable creep coefficient which is caused by the non-uniform temperature distribution. To facilitate a simple formulation, it is assumed that the temperature dependence of the elastic response of the material is approximated to be inversely proportional to the creep rate. It is shown that the problem reduces to the solution of several associated (fictitious) elastic problems which have a common elastic modulus inversely proportional to the creep rate of the irradiated graphite. Numerical examples in the previous paper were recalculated on the basis of the present theory. It shows, for large dose values, some small differences compared with the previous calculation. This method is expected to be more effective for higher dose values and more sensitive creep coefficients.
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