NUCLEAR FUEL ELEMENT FOR LIGHT WATER REACTOR

摘要

PROBLEM TO BE SOLVED: To provide a nuclear fuel element which is not disturbed in axial movement of fission product gas and can ensure the inventory of fission product material such as uranium identical to solid pellets even if fusion layer is formed at a high burnup between uranium oxide or mixed oxide-sintered pellets and zircaloy clad tube. SOLUTION: Nuclear fuel elements for light water reactor filled with uranium oxide or mixed oxide-sintered pellets 1 inside a zircaloy clad tube 3 is provided with a thin center hole 2 in the center of the uranium oxide or mixed oxide- sintered pellets 1 and the sintering density of the sintered oxide pellets 1 is made high. A plenum spring 6 is provided via the press plate 4 on the upper end of the pellets 1.