1. Introduction
These benchmark specifications are designed
to provide a simple calculational benchmark problem for a mixed-oxide lattice
that is typical of that for fissile materials disposition. The model chosen
was that of a pressurized water reactor (PWR) in a 1717 assembly lattice
of pins all of which have the same initial composition. The assembly contains
24 control rod guide tubes, some of which may contain annular burnable
poison rods at various times during the assembly irradiation. A central
instrumentation channel is also present
Several calculations are to be performed
at beginning of life (BOL) to provide keff, the pin power distribution,
and isotopic reaction rates. BOL calculations will be performed at cold
zero power (CZP), hot zero power (HZP) and hot full power (HFP) with various
soluble boron concentrations. A three cycle irradiation is performed to
a discharge burnup of 45 GWD/MTHM. The keff, pin power distribution,
reaction rates, and isotopic concentrations are to be provided at the middle
and end of each cycle.