Abstract: A tool is disclosed for assembling or disassembling an endcap into or out of a housing. The housing includes a distal end, an intermediate portion, and a receptacle disposed in the distal end. The tool includes a hook removably joinable to the endcap, and a clamp removably joinable to the housing intermediate portion. The hook is jacked relative to the clamp for translating the endcap relative to the receptacle for either assembling or disassembling the endcap into or out of the housing.

Abstract: A brake assembly is disclosed for selectively preventing rotation of a shaft, such as a shaft used in a control rod drive for a nuclear reactor. The brake assembly includes a stationary base, a rotor disc fixedly connected to the shaft for rotation therewith, and a brake member disposed adjacent to the rotor disc. The rotor disc includes at least one rotor tooth and the brake member includes at least one braking tooth. The member is selectively positionable in a deployed position for allowing the braking tooth to contact the rotor tooth for preventing rotation of the shaft in a first direction while permitting roation in the opposite direction, and in a retracted position for allowing the rotor disc and shaft to rotate in either direction without restraint from the brake member.

Abstract: An apparatus is disclosed which measures forces resisting the movement of pistons in a control rod drive mechanism in a nuclear reactor and which includes pressure sensing means and further includes hydraulic circuitry to divert pressurized fluid from a normal operating conduit to a selected shunt conduit containing a valve having a particular fluid control characteristic, said shunt conduit directing the fluid to a selected piston to move said piston and said pressure sensing means measuring the pressure of the fluid during the motion of said piston to give an indication of the force needed to achieve such motion.

Abstract: Braking of the motion of a fluid-actuated drive is provided by a buffer arrangement which is normally sealed to prevent vaporization of the fluid in a buffer cylinder and which isolates the drive piston rings from braking pressures.