CONTROL ROD SUPPORT

摘要

PURPOSE: To extend the durability of a control rod by making flat a control rod surface and the friction surface of a support on a contact surface. CONSTITUTION: A passage hole for a control rod 30a is provided on a cylindrical inner wall surface 102 that is interrupted by a groove or a slot 103 that is demarcated by inner wall surfaces 103a and 103b being separated in a support 100. Flat friction surfaces 105a and 105b that spread at an equal angle from a cross point between the inner wall surfaces 113a and 103b of the slot 103 toward a side are provided and friction marks 131a and 131b that are not in wedge shape are formed uniformly on a projecting friction surface of the control rod 30a that contact the flat friction surfaces 105a and 105b. The friction surfaces 105a and 105b are formed in parallel with the axial line of the inner wall surface 102 of the support 100' and the parallel plane is orthogonally crossed a line that crosses at a contact point between the parallel plane and the cylindrical surface of the control rod 30a with the axial line as a starting point, since Hertz contact stress is thereby reduced, the durability of the control rod is extended, and a maintenance interval can also be extended.