Development and verification of numerical study to calculate focal points of temperature in helium cooled ceramic blanket (HCCB) system in CFETR

Abstract

In this paper, a novel theoretical model has been developed to obtain focal points of temperatures in helium cooled ceramic breeder (HCCB) blanket system of China Fusion Engineering Test Reactor (CFETR). The main objective of the paper is to develop a theoretical-computational model for safety of blanket system, structure stress analysis and feasibility design. The theoretical-computational model was developed and verified by computational techniques using C++/MATLAB program and later with thermo-hydraulic system codes, i.e. RELAP5 and THEATRE. Mathematical model was developed for the thermal conductivity in HCCB blanket system and heat conduction model by using numerical technique. This model was then transferred to C++/MATLAB program and developed a program for calculating the thermal contact temperature of HCCB region. The calculated temperature values were then compared with RELAP5 and THEATRE codes for the accuracy of theoretical model. The preliminary thermal-hydraulic simulation results indicate that the maximum temperature on the first wall (FW) satisfies the design allowable limit and that the cooling channels were designed accurately. The results obtained from these analyses are very close to the experimentally defined values depicting the accuracy of theoretical and simulation results. The calculated results can be applicable to other tokamak devices like CFETR, ITER and JET as well.