Direct Discrete Method (DDM) and its Application to Neutron Transport Problems

The objective of this paper is to introduce a new direct method for neutronic calculations.this method, called direct discrete method (ddm), is simpler than the neutron transportequation and more compatible with the physical meanings of the problem. the method, basedon the physics of the problem, initially runs through meshing of the desired geometry. next,the balance equation for each mesh interval is written. considering the connection between ~hemesh intervals, the final discrete equation series are directly obtained without the need to firstpass through the set-up of the neutron transport differential equation. in this paper, a single andmultigroup neutron transport discrete equation has been produced for a cylindrical shape fuelelement with and without the associated clad and the coolant regions, each with two differentexternal boundary conditions. the validity of the results from this new method are tested againstthe results obtained by the mcnp-4b and the anisn codes