Disturbance Search Method for Reactor Core Power Reconstruction Based on Out-core Detection

A method for reconstructing the core power by searching disturbance variable based on the out-core detection data was proposed. The influence of various disturbance factors on core power was studied. The relationship between disturbance factors and core power distribution and out-core detection data was established. The diffusion equation and optimization algorithm coupling program was used to calculate the distributions of power disturbances and disturbance factors. The techniques and methods were analyzed to improve the search efficiency of disturbances. Single-variable and double-variable examples were set up to verify this problem. The bivariate calculation results show that the root mean square of the deviation between the data provided by the out-core detector and the theoretical calculation data before and after the core power disturbance can be reduced by two orders of magnitude. The relative deviation of the maximum power can be reduced from 6.78% to 0.08%. The method can successfully reconstruct the power distribution and find out the power influence factors.