Patent Number: 
Section: claims

1. A modular submersible repairing system comprising: a working unit; and  a base unit;  wherein the working unit includes:  at least one type of tool module repairing structures in a reactor,  a scanning/pitching module being selectively connected to or disconnected from the tool module, and provided with a scanning/pitching shaft for scanning or pitching the tool module,  a submersible fan module being selectively connected to or disconnected from the scanning/pitching module, and  a first buoyant module for keeping an orientation of the tool module;  the base unit includes:  a manipulator module internally provided with an actuator driving mechanism,  an adsorbing module being detachably mounted on the manipulator module and a wall, and  a second buoyant module for keeping an orientation of the manipulator module;  each of at least the scanning/pitching module and the manipulator module is provided with a submersible connecting device being operated in water for engagement and disengagement;  configuration and functions of the modular submersible repairing system can be changed or modified according to various purposes of work in the reactor by properly combining those modules; and  the modules can be connected together in the reactor by remotely operating the submersible connecting devices. 2. The modular submersible repairing system according to  claim 1 , wherein the submersible connecting device includes a male connecting unit provided with a taper member, and a female connecting unit provided with a taper hole complementary to the taper member. claim 1 3. The modular submersible repairing system according to  claim 2 , wherein the submersible connecting device is provided with an ultrasonic distance measuring device measuring distance between the modules to be connected in a noncontact measuring mode, and a locking mechanism for preventing disengagement of the male connecting unit and the female connecting unit. claim 2 4. The modular submersible repairing system according to  claim 1 , further including a hoisting device for suspending and submerging a desired module in water, the hoisting device comprising a gripper for gripping the module, and an engaging/disengaging device adapted to draw a first module to be connected to a second module toward the second module and to push the first module away from the second module. claim 1 5. The modular submersible repairing system according to  claim 4 , wherein the engaging/disengaging device includes an axially movable arm, and a claw which engages the first module to draw the first module toward the second module or to push the first module away from the second module. claim 4 6. The modular submersible repairing system according to  claim 1 , wherein the manipulator module is provided with an extension mechanism which is expandable, and the scanning/pitching module is connected to an extremity of the extension mechanism. claim 1