Experimental Research on Mixing Coefficient of Fuel Assembly in Single-Phase

The mixing coefficient test of the fuel assembly with French X type space grids was performed in the Large Scale Thermo-Hydraulic Experiment Facility. The special temperature measurement element was designed and exit temperatures of subchannels were measured accurately. The mixing coefficient obtained from the test, in conjunction with FLICAⅢF subchannel analysis code, is 0.065, which is closed to French designed data 0.066. The experimental results also show that the mixing coefficient is affected by the structure of fuel assembly rather than by thermal parameters.