Advanced Method for Calculations of Core Burn-Up, Activation of Structural Materials, and Spallation Products Accumulation in Accelerator-Driven Systems

Table 3

CPU time share between ALEPH modules to calculate one irradiation step (90 days) of MYRRHA subcritical core. The MCNP(X) calculations have been performed on 64 CPU cluster using Open MPI. The number of irradiated materials is 11 (so that the reaction rates generator and the RADAU5 solver were called 11 times). Full matrix for 𝑁=3851 nuclides is used.

	CPU wall time, s	Fraction, %
MCNPX fluxes and spectra, rsd 0.1%	3.58𝑒+6	99.988
ALEPH generation of average cross sections	19.3	5.4𝑒-4
ALEPH solving ODE by RADAU5	312.5	8.7𝑒-3
(or ALEPH solving ODE by ORIGEN-2.2)	(14.7)	(4.1𝑒-4)
Total		100