(Studi Kasus untuk Pengambilan Kalor Peluruhan Secara Pasit) Alexander Agung; email: a.agung(@gmail.com. and Danny liathouwers, Tim van der Hagen, Hugo van Dam. Numerical simulations have been performed to investigate the possibility of passivedecay heat removal in a fluidized bed nuclear reactor. The conduction, convection andradiative heat transfer were included arid the high Reynolds number k-e turbulencemodel was applied for the flow calculations. The Pj and SN approximation methods forparticipating media were used for the radiation model. The reactor was modeled as a2D axisymmetric cylinder. Calculations were performed for an initial operating powerof 60 MW. The results show that P j method is quite good to be applied in the particlebed' but it fails in the freeboard. The high order SN method can be applied extremelygood both in the particle bed and the freeboard. The drawback of the SN method is itslong computational time. The invalidity of Pj method leads to a high fuel particletemperature, exceeding its allowable maximum value. Such situation, however, does notoccur in the SN method.Kevwords: decay heat, fluidized bed l'!uclear reactor, passive heat removal, numericalsimulation, PN methods, SN methods
