Control rod/fuel support handling apparatus

摘要

A control rod/fuel support handling apparatus that is used in the case where a control rod and a fuel support are held, removed and lifted in a reactor and then are transported into the reactor in a periodical inspection of a BWR and in the case where the control rod and the fuel support are attached and mounted again into the reactor, the control rod/fuel support handling apparatus including: a fuel support gripper that holds the fuel support with a support gripping member; a control rod gripper that includes a vertically movable and rotatable elevating/rotating unit, holds the control rod with a control rod gripping member, disconnects and connects the control rod and a control rod drive mechanism, and allows removal and attachment of the control rod; and a control panel that controls automatically controls the control rod gripper in response to the instructions from an operation pendant.

主权项

1. A control rod/fuel support handling apparatus that removes and attaches a control rod disposed between fuel assemblies in a reactor pressure vessel and a fuel support installed on a core plate located below a upper guide in the reactor pressure vessel, the control rod having a lower end part detachably connected to a control rod drive mechanism via a bayonet coupling, the fuel support supporting a lower end part of the fuel assembly and allowing insertion of the control rod in a cruciform space,
the control rod/fuel support handling apparatus comprising: a fuel support gripper that is supported from above of the reactor pressure vessel so as to move in a vertical direction and holds the fuel support with a support gripping member so as to remove and attach the fuel support; a control rod gripper that is accommodated in the fuel support gripper, includes a vertically movable and rotatable elevating/rotating unit, holds the control rod with a control rod gripping member provided under the elevating/rotating unit, disconnects and connects the control rod and the control rod drive mechanism, and allows removal and attachment of the control rod through the cruciform space of the fuel support; a fuel support seating detector which detects seating of the lower end of the support gripping member on the core plate; a fuel support grip detector which detects that the support gripping member holds the fuel support; a load measuring instrument that is provided in the elevating/rotating unit and measures a load applied to the control rod gripping member; an operation mechanism that provides instructions on operations of the fuel support gripper and the control rod gripper, the operation mechanism configured to be operated by a first signal from said fuel support seating detector, a second signal from said fuel support grip detector, and a third signal from said load measuring instrument; and a control panel that controls the fuel support gripper in response to the instructions from the operation mechanism and automatically controls the control rod gripper.