Yes, definitely. With deterministic methods you have to make all sorts of approximations to discretize the spatial details of the fuel assemblies, the energy sp

Yes, definitely. With deterministic methods you have to make all sorts of approximations to discretize the spatial details of the fuel assemblies, the energy space of the neutrons, the angular directions of the neutrons, and so on. The approximations are complex and sensitive. With monte carlo methods you can treat all those things without approximations. Under the hood, both deterministic and monte carlo nucleonics methods are depending on the same measured/interpolated nuclear interaction probability tables (aka nuclear cross sections).