BUNDLE OF NUCLEAR FUEL FOR CANDU-PHWR TYPE

摘要

The nuclear fuel bundle (1) has 39 circular rods with 2 different diameters. 20 fuel rods (2,2') with a diameter less than the others are positioned on the outer circumference of the bundle. The other 19 rods have the structure that 18 rods (3,3',4,4') are concentrically assembled in the center of one core rod (1). This geometrical fuel bundle can use low-concentrated nuclear fission material as well as natural uranium (0.7 wt.% U- 235) and increase the average dischrge combustion ratio, the robustness and the stability rather than the conventional nuclear fuel bundle with 37 rods.