Leading fuel assembly mixing reactor core loading method

The invention belongs to the field of reactor engineering design and operation, particularly relates to a leading fuel assembly mixing reactor core loading method, and provides a leading fuel assembly mixing reactor core loading method for ensuring the reactor operation safety and reliability during a TVS-2M type fuel assembly and AFA type fuel assembly mixing reactor core transition process by verifying the compatibility of the two types of the fuel assemblies in the reactor core. The leading fuel assembly mixing reactor core loading method comprises: using a fuel circulation tube, loading six groups of TVS-2M leading fuel assemblies into the tube, forming a mixing reactor core with an AFA fuel assembly, and carrying out four fuel cycles of testing, wherein the six groups of the TVS-2M fuel assemblies are loaded into six quadrants according to 1/6 symmetry; monitoring the operation condition of the TVS-2M fuel assemblies in the most non-uniform neutron flux condition; monitoring the operation conditions of the TVS-2M fuel assemblies at different positions of the reactor core; and at least arranging a neutron temperature measurement channel inside a leading assembly in each fuel cycle so as to be real-timely monitored.