Solution of some nonstationary problems of the prompt-neutron transport theory by the Monte-Carlo method

Presented are the numerical examples confirming the practical applicability of the algorithm of the Pade analysis of the Laplace image of the nonstationary flux calculated by the Monte Carlo method. The programmes were written in ALGOL for the M-222 computer in the TA-2M translator system. The spectrum in hydrogen program (SPEH) permits to calculate by the Monto Carlo method the time dependence of the neutron flux energy spectrum in the hydrogen-containing infinite medium with a pulse monoenergetic infinite source. The series of CODR (Characteristics of a one-dimentional reactor) programmes permits to calculate Ksub(eff) and the space asymptotic distribution of neutron flux in the multizone flat single-velocity reactor. The first two eigen values and their perturbations in the triple zone flat single-velocity system are estimated with the help of the SIMFRA programme. It is shown that the application of the algorithm of the Pade analysis of the Laplace image of the nonstationary flux F(t) permits to increase the determination accuracy of the eigen values and the F(t) description in accordance with the F(t) direct estimates