ADJUSTING ROD FOR WATER-COOLED NUCLEAR REACTOR

摘要

The invention relates to a device being part of a system for the control and protection of the housing of an water-cooled nuclear reactor. It can be used in adjustment members made in the form of a rod or a combination of rods. The adjusting rod (1) consists of a sheathing (2) in which a column (3) of neutron absorber is fitted. Column (3) is made of two parts, one of which (4) is made of a material entering reaction (n,) with neutrons, e.g. boron carbide. The other part (5) which is mobile and with the facility to be introduced in the active zone of the first part is made of material based on dysprosium and has a length determined by a mathematical expression in which the length of colum (3) and the size of the effectiveness of the rod with different characteristics are used. The determination of this length allows to make a rod with a maximum effective mass considering also any changes in its absorption capability when the relative content of the material based on dysprosium is increased the density of which is higher than the density of the boron carbide. 9 claims, 4 figures