Abstract
A new core solver named parafish is presented for the solution of large neutron transport core calculations. The second-order even-parity form of the time-independent Boltzmann transport equation is solved using an innovative algebraic domain-decomposition method. The spatio-angular discretization is performed using non-conforming finite elements and spherical harmonic expansions ( P N method). The parafish code allows one processor to handle more than one domain. This enables proper evaluations of the speed-up. Also, this enables to show that the domain-decomposition method not only performs well in parallel calculations, but also has an inherent acceleration potential. That is, it yields acceleration even without increasing the number of processors.
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