The Design And Neutronics Analysis Of CFETR WCCB Experimental Mock-up

Fusion neutronics experiment plays an important role in the research of the whole fusion reactor. Blanket, as one of the key components in a fusion reactor, has significant functions of tritium breeding, energy conversion and neutron shielding. It is very important to carry out the fusion blanket neutronics experiment for the verification of the specific neutron energy spectrum、nuclear data base、tritium production performance and so on.Based on the water cooled ceramic breeding blanket basic scheme for CFETR, it conducted to design and analyze the neutronics experimental mock-up. By determining the size, composition and basic structure of blanket experiment mock-uo to carry out the preliminary scheme. The size of the whole experiment mock-up is 50cm (X) × 59.1cm (Y) × 50cm (Z). In order to maintain the characteristics of the CFETR WCCB blanket, the radial arrangement of the experimental mock-up is consistent with that of the CFETR WCCB blanket. The experimental mock-up consists of 3 tritium breeder zone,2 neutron multiplying zone and 3 cooling plate, add to first wall, tungsten armor and back plate. In addition, the local tritium production rates (TPR) from 6Li and 7Li in breeder zone were measured with Li2CO3 pellet.On the basis of the preliminary scheme, the neutron energy spectrum and the tritium production rate (TPR) of each region of the experimental mock-up were obtained. The distribution of neutron flux and the neutron spectra in each region revealed the edge effect of the experimental mock-up and the neutron spectrum in the middle region is the most representative of the neutron energy spectrum of the original blanket. Then based on this scheme, analyze the influence of reflector on experimental mock-up, it was found that the reflector can improve the TPR value. Considering the energy spectrum, TPR and the economic factors, the reflector with steel is a better choice. In addition, it was found that neutron source information had a greater impact on the results of the experiment. So it was compared to the result of using point source and non point source, the result to be turn out that using non point source can increase the TPR value, which is the percentage of about 8.8%.In conclusion, the steel reflector of the water cooled blanket neutron experiment mock-up is recommended, in addition,the middle region of the experimental module is the key focus of the blanket neutron experiment mock-up.