Rotational Apparatus Usable With Control Drum Apparatus In Nuclear Environment

A rotation apparatus usable with a control drum in a nuclear environment, the control drum having a shaft that is rotatable about an axis of rotation that is horizontal, a reflector portion situated on the shaft, an absorber portion situated on the shaft, and a motor which, when powered, is operable to move the shaft between an operational position wherein the reflector portion faces toward a core of the nuclear environment and a shutdown position wherein the absorber portion faces toward the core, the rotation apparatus comprising:

• a rotation mechanism which is structured to apply to the shaft in the operational position a force that is structured to rotate the shaft toward the shutdown position, the force being resisted by the motor to retain the shaft in the operational position when the motor is powered, the force not being resisted when the motor is unpowered;
• and
• a rotation management system that is structured to resist rotation of the shaft when the shaft is in the shutdown position.