**4. Results**

The thermal conductivity of the binary mixture of He-Xe and He-Kr is calculated using the code and the temperature profile is shown in **Figure 1**. The fuel assembly that is analyzed has the same power generation rate and is computed for the same fuel irradiation history.

As the yield of Kr is small as compared to Xe yield hence its effect on the total temperature is small and He dominates the equivalent heat transfer characteristics. For fuel-producing nearly equal power but different irradiation history, we observe that the assembly has a different temperature (**Figure 2**). This is attributable to poor

**Figure 1.** *The temperature profile of fuel assembly for He-Xe binary and He-Kr binary.*

**Figure 2.**

*Assembly producing similar power but different irradiation history and hence different amount of xenon gas buildup in the plenum gap.*

heat conduction properties of the He-Xe binary and relative dominance of Xe in the equivalent conductivity. The fuel parameters computed using FCCAL are compared with MATPRO-10 typical parameter values and agree with MATPRO predictions.
