Circulating cooling method of spent fuel transfer container of kilowatt-grade nuclear power plant

The invention belongs to the technical field of spent fuel treatment of kilowatt-grade nuclear power plants, in particular to a circulating cooling method of a spent fuel transfer container of a kilowatt-grade nuclear power plant. According to the circulating cooling method of the spent fuel transfer container of the kilowatt-grade nuclear power plant, firstly, an inner cavity of the spent fuel transfer container is filled with compressed gas until radioactivity in the inner cavity reaches a preset radioactivity value; then the spent fuel transfer container is filled with demineralized water,wherein the demineralized water can effectively avoid boric acid crystallization caused by overhigh temperature in the inner cavity of the spent fuel transfer container; and thereafter, the spent fueltransfer container is filled with boron water, wherein the spent fuel transfer container is continuously filled with the boron water for circulating and cooling, so that the inner cavity stably reaches a preset temperature, a