Research on Alternative Method of Fast Reactor Fuel Assembly

In order to shorten the process-cycle of the fuel assembly, it is necessary to search a new method to simplify the structure of fuel assemblies which are used for the fast reactor core flow distribution test. The CTS theoretical algorithm was adopted to calculate the influence of structural parameter for fuel assembly on the hydraulic characteristics of assembly. The method using a alternative assembly which has less fuel rod to complete the experiment was proposed. The method keeps the same external structure and test environment of the assembly, and decreases the amount of fuel rod to obtain the same hydraulic characteristics of the multi-rod fuel assemblies. The calculation results show that the alternative assembly conforms to the hydraulic curve of the original assembly, and the method can meet requirements.