*Plenum Gas Effect on Fuel Temperature DOI: http://dx.doi.org/10.5772/intechopen.101098*

characteristics evaluation. Computing the effect of fission gas products on the overall fuel temperature is presented with the rod irradiation phenomena. From the analysis, it is clear that the code FCCAL can be used for the calculation of fuel centerline temperature, fuel surface temperature, and average coolant temperature of the Pressurized Heavy Water Reactor (PHWR). A better approximation can be obtained by incorporating the fuel cracking and deformation. The effect of fuel heat loss due to irradiation although negligible in steady-state assumes significance in severe transients.
