In this study a CFD simulation of a horizontal heater rods test (CS28-2) has been performed with the CFX-10 code and it has been compared with an experiment in order to develop a post-blowdown modeling of a CANDU fuel channel during a large break loss of coolant accident (LBLOCA). The CS28-2 experiment is one of three series of experiments to simulate the fuel channel at a high temperature and a low steam flow rate which may occur in severe accident conditions such as a LBLOCA of CANDU reactors. Since radiation heat transfer is dominant in the CS28-2 experiment, a benchmark problem of radiation heat transfer for the same geometry as the CS28-2 is carried out first to assess the radiation model by CFX-10, to confirm whether CFX-10 can be applied to a complex fuel geometry or not. And, the CFD study of the CS28-2 has been performed with the aim to simulate the steady-state condition of the CS28-2. These steady-state calculation results will be used for the initial conditions of the transient simulation.
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