EVALUATION OF PERTURBATION EFFECT DUE TO FISSION-SOURCE CHANGE IN EIGENVALUE PROBLEMS BY MONTE CARLO METHODS

摘要

The formulae to evaluate the fssion-source change by the correlated and diu000berential operatorrnsampling methods have been derived. The perturbation eu000bect due to the fssion-sourcernchange has been well evaluated and the obtained change in an eu000bective multiplication factorrnare improved. The perturbation procedures based on the formulae have been incorporatedrninto a continuous-energy Monte Carlo code MVP and verifcation calculations have beenrnperformed for both fast and thermal systems.