A Computational Method for Equilibrium Cyclic Search in Fast Neutron Reactors

Abstract

The invention discloses a calculation method used for searching for a balanced cycle of a fast neutron reactor. The method comprises the steps of 1, representing a fuel management scheme as multiple fuel management paths; 2, making a fuel cycle process equivalent to an approximate balanced cycle; 3, for the approximate balanced cycle, performing neutron transport and burnup coupling calculation of an in-reactor cycle to obtain a transmutation matrix of each stage of each fuel management path; 4, repeating the steps 2 and 3 until a nuclear density vector of each stage of each fuel management path is converged, thereby obtaining an in-reactor cycle mode; 5, performing linear interpolation or extrapolation on cycle length, and performing a search to obtain the in-reactor cycle mode meeting discharge burnup level requirements; 6, calculating spent fuel reprocessing recovery and new fuel reproducing processes, performing burnup calculation of the in-reactor cycle on a nuclear density vector of newly loaded fuel according to the transmutation matrix, and repeating the processes until the nuclear density vector of the newly loaded fuel of each fuel management path is converged; and 7, adjusting the enrichment degree of the newly loaded fuel to realize a target effective multiplication factor of a specified time point.

Description

technical field [0001] The invention relates to the field of nuclear reactor fuel cycle, and relates to a calculation method for fast neutron reactor equilibrium cycle search. Background technique [0002] The fuel cycle of a nuclear reactor involves the complex process of nuclear fuel manufacturing, nuclear fuel burnup in the reactor, and the reprocessing and recovery cycle of spent fuel unloaded from the reactor. The fuel cycle simulation of nuclear reactors can calculate the mass flow of nuclear fuel in the process of internal and external circulation, and evaluate the effective multiplication factor k of the reactor eff , core power distribution and other parameters are the basis of nuclear reactor design analysis and economic evaluation. The equilibrium cycle of a nuclear reactor is a representative cycle of reactor operation, and the determination of parameters such as cycle length and fuel enrichment is a key step in reactor design analysis. [0003] The existing fa...

AI Technical Summary

Problems solved by technology

In the above fast neutron reactor fuel cycle calculation method, the calculation efficiency of the search balance cycle by cycle by cycle calculation is low, and it is difficult to meet the actual needs of fast neutron reactor design and analysis

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