On the Monte Carlo evaluations of the Ksub(eff) derivative and perturbations

Evaluations of the derivative and nonlocal perturbations of Ksub(eff) which are employed in the Monte Carlo calculations of nuclear reactors are systematized and discussed. The evaluations for neutron collisions, range and absorption are considered. The evaluations are based on the neutron importance determination as asymptotic power of a critical reactor at a certain point of which a neutron has been initially placed