Comparisons of Fission Rate Distributions with Experimental Data

The BFS-75-1 experimental program was carried out and the comparison between calculation and experiment was performed. In case of BFS-75-1 critical experiment core, there exists a strong heterogeneity because the core is composed of a lot of plate type pellet to simulate the reactor core instead of fuel pins used in the actual core. The core design is commonly performed based on the homogeneous model and differences with the actual core calculations scheme happen, so that the heterogeneity corrections are needed to correct these differences. In this paper, the calculation results on the fission reaction rate distribution which shows a large heterogeneity effect are analyzed. To analyze the heterogeneity of the fission reaction distribution, homogeneous and heterogeneous model calculations were performed