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Figure 1: Spent fuel tube bundle, CFD model.

Figure 1 shows the geometry of a spent fuel tube bundle inside a wet transport flask. This was analysed in order to assess fuel cladding temperatures during a standard IAEA fire event. The heat transfer mechanisms considered in this particular analysis included conduction, convection, radiation, evaporation and condensation. Studies were performed with both the CFX and Fluent codes for verification purposes.

[1] Burt, D.J., Cory, A.R., Graham, S.J and Myszko, M.
Ullage Temperatures in Wet Spent Fuel Transport Flasks, Proc Inst Nuc Eng, Vol 13, No 3-4, 2002.