EXECUTIVE MECHANISM OF THE CONTROL SYSTEM AND PROTECTION OF A NUCLEAR REACTOR

摘要

The invention relates to the field of nuclear engineering and can be used in nuclear reactor control and protection system actuators. An actuator of a nuclear rector control and protection system comprises: a linear stepper motor having an armature; a rod which is arranged coaxially with the armature, and which is rigidly connected to the armature to provide vertical movement and rotation about a vertical axis, and which is designed to be capable of forming an L-shaped bayonet connection with a working member; and a lock to prevent spontaneous rotation of the rod. The lock comprises a guide which is arranged inside the armature and which is provided with a flange and a longitudinal through slot; a cross-member which is rigidly connected to the armature and which is mounted in the slot such as to be capable of vertical movement therein during a working stroke; a fixed ring, on which the inside surface of the flange rests; and a vertical pin. Through slots are arranged equidistantly on the outside rim of the flange, and openings are arranged equidistantly about the circumference of the fixed ring, the vertical pin being mounted in one of said openings such as to pass through one of the through slots in the flange. The technical result of the present invention is that of preventing spontaneous disengagement of the bayonet connection, while also reducing the number of steps required to engage and disengage said connection.