Patent ID: 7606686

Claim:
A computer-implemented method for simulating a three dimensional radiation field distribution of neutron and gamma radiation in a nuclear reactor to calculate ex-vessel dosimetry responses, the nuclear reactor comprising a reactor vessel and a reactor core, said method comprising: generating a geometrical model of the reactor core; generating a material distribution of the reactor core; calculating the neutron and gamma radiation using a radiation transport methodology, the transport methodology comprising: calculating a distribution of particles throughout a phase space by generating a solution of the Linearized Boltzmann Equation (LBE) which includes solving discrete ordinates method (S N ) equations; generating a solution to the S N equations on 3-D Cartesian or cylindrical geometries using domain decomposition algorithm methodology, the algorithm methodology comprising: partitioning angular and spatial domains of the phase space into subsets; allocating independently the subsets to a plurality of processors; and processing the subsets on the plurality of processors.