Nuclear reactor control rod

摘要

A control rod for nuclear reactor having a lower section that contains an annular neutron absorber wrapped in a metal sleeve. The sleeve rests on a lower spacer which is seated on the control rod lower end cap. The upper portion of the sleeve extends above the annular neutron absorber of this lower section and is capped by an upper spacer. The standard neutron absorber is supported above this upper spacer which rests on the upper end of the metal sleeve to define a gap between the upper spacer and the annular neutron absorber to accommodate axial expansion.