Abstract
A simulation for the time evolution of the MYRRHA conceptual reactor was developed. The SERPENT code was used to simulate the nuclear fuel depletion and the spallation source which drives the system was simulated using both MCNPX and GEANT4 packages. The obtained results for the neutron energy spectrum from the spallation are coherent with each other and were used as input for the SERPENT code which simulated a constant power operation regime. The obtained results show that the criticality of the system is not sensitive to the spallation models employed and only relative small deviations with respect to the inverse kinetic model coming from the point kinetic equations proposed by Gandini were observed.
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