Channel box

Abstract

PURPOSE: To improve insertion ability of control rods by allowing a part of each side wall of rectangularly cylindrical channel box, to have a tapered thin thickness part by grinding its outside in a manner that the wall thickness decreases gradually counterclockwisely from a corner part to the adjacent corner. CONSTITUTION: This channel box has a cylindrical shape of which horizontal cross-section is rectangularily shaped, and a thin thickness part A that an outside of each side wall 2... 2 of channel box is ground in a manner that the wall thickness decreases gradually counterclockwisely from a corner part to the adjacent corner, and another reversely tapered thin thickness part B that an outside of each side wall is ground in a manner that the wall thickness decreases gradually clockwisely from a corner part to the adjacent corner, are piled alternatively and vertically side by side, and forms multiply staged shape, as a whole. The tapered thin thickness part A and the reversely taped thin thickness part B are placed alternatively and vertically side by side and therewith a thin thickness part which is tend to deform easily is placed adjacently to a thick part which is hard to deform. With this procedure, even if difference between inner and outer pressures is generated accompanyingly to burn-up of a fuel rod, deformation of the thin thickness parts is so small and insertion ability of control rod is much improved. COPYRIGHT: (C)1991,JPO&Japio

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