Author(s)

M. Itagaki

Abstract

The matrix-type multiple reciprocity method has been reformulated to analyse the modified Helmholtz neutron flux mode in a domain which has a strong neutron absorption. The fundamental solutions for the modified Helmholtz mode can be given simply by replacing the imaginary quantity IB^ in the conventional Helmholtz-type solutions by a real quantity A,. Test calculations demonstrate the validity of the present reformulation and the usefulness when applied to the nuclear criticality analysis. 1. Introduction The asymptotic mode of the neutron flux distribution in a nuclear criticality system can be usually modeled using the Helmholtz equation. With this assumption, the author previously applied the multiple reciprocity

Keywords