Effect of the nonuniformity of graphite samples on their shape change under irradiation

摘要

It is shown that the use of the initial characteristics of samples makes it possible to decrease substantially the variance and the bias in the determination of the critical neutron fluence for GR-280 RBMK graphite. It is recommended that graphite model that includes neutron fluence and the initial value of the elastic modulus be used as an approximation for dimensional changes of graphite samples. 2 figures, 2 tables, 3 references.