FUEL ELEMENT FOR RESEARCH REACTORS (OPTIONS)

摘要

1. A fuel element for research reactors in the form of a thin-walled tubular shell made of zirconium alloy sealed at the ends, made in cross-section in the form of a four-pointed star, the rounded protrusions of which form spirally twisted spacer ribs, in the center of the shell there is a fuel core in the form of a cylindrical rod made of alloy of uranium and 1.5-9 wt.% molybdenum, the diameter of which is from 0.85 to 0.95 of the diameter of the inscribed circle in the shell, a contact material is placed between the shell and the rod. ! 2. The heat-generating element according to claim 1, characterized in that the contact material is made in the form of an aluminum powder in a silumin matrix. ! 3. The fuel element according to claim 1 or 2, characterized in that the outer spacer and inner centering ribs are wound with a pitch of 200-400 mm, preferably 300-340. ! 4. The fuel element according to claim 1, characterized in that the shell is made with a thickness of 0.15 to 0.3 mm. ! 5. A fuel element for research reactors in the form of a thin-walled tubular shell made of zirconium alloy sealed at the ends, made in cross-section in the form of a four-pointed star, the rounded protrusions of which form spirally twisted spacer ribs, in the center of the shell there is a fuel core in the form of a cylindrical rod made of alloy of uranium and 1.5-9 wt.% molybdenum, a coating with a thickness of 0.08-0.15 mm is applied to the surface of the core, made, for example, of alloys of zirconium or zirconium nitride, a contact material is placed between the shell and the rod. ! 6. The fuel element according to claim 5, characterized in that the coating is made