Nuclear reactor inspection and maintenance equipment

Abstract

This invention provides a reactor inspection and maintenance technology for improved boiling water reactors (ABWRs) that does not involve the disassembly and removal of the recirculation pump (RIP). [Solution] The reactor inspection and maintenance device 10 includes equipment 23 for inspecting and maintaining the area around the pump deck 3 through which multiple diffusers 16, each containing the rotor blades of a recirculation pump 15 that circulates cooling water internally in the reactor pressure vessel 1, pass; a first traveling section 11 that travels on the inner side of the upper surface of the annular horizontal plane 3a of the pump deck 3; a second traveling section 12 that travels on the outer side of the upper surface of the annular horizontal plane 3a; and a connecting section 13 that connects the first traveling section 11 and the second traveling section 12 and forms a space to avoid interference with the diffusers 16 during travel.

Claims

1. Equipment for inspecting and maintaining the area around the pump deck through which multiple diffusers containing the rotor blades of recirculation pumps that circulate cooling water internally in the reactor pressure vessel of a boiling water reactor pass, A first running section that runs along the inner upper surface of the annular horizontal plane of the pump deck, A second running section that runs along the outer upper surface of the annular horizontal plane, A reactor inspection and maintenance device comprising: a connecting portion that connects the first traveling portion and the second traveling portion, and that forms a space to avoid interference with the diffuser during travel.

2. In the reactor inspection and maintenance device according to claim 1, A reactor inspection and maintenance device comprising a biasing member that biases the outer circumferential surface to which the inner end of the pump deck is welded, or the inner circumferential surface to which its outer end is welded.

3. In the reactor inspection and maintenance device according to claim 2, The aforementioned device is provided on the side opposite to the side that the biasing member biases, An inspection and maintenance device for a nuclear reactor, comprising rolling wheels that abut the outer or inner circumferential surface in close proximity to the aforementioned equipment.

4. In the reactor inspection and maintenance device according to any one of claims 1 to 3, A reactor inspection and maintenance device that separately mounts the first and second devices and operates a plurality of them in series.

5. In the reactor inspection and maintenance device according to any one of claims 1 to 3, The connecting portion is hinge-connected to at least one of the first running portion and the second running portion. A reactor inspection and maintenance device having a link mechanism that allows the hinge connection to be freely folded by external operation.

6. In the reactor inspection and maintenance device according to any one of claims 1 to 3, The connecting portion is composed of a pair of rods that are hinge-connected to both ends of the first and second running portions. A reactor inspection and maintenance device having a link mechanism that allows the hinge connection to be freely folded by external operation.

7. Equipment for inspecting and maintaining the area around the pump deck through which multiple diffusers containing the rotor blades of recirculation pumps that circulate cooling water internally in the reactor pressure vessel of a boiling water reactor pass, A reactor inspection and maintenance device comprising: a movable unit that mounts the aforementioned equipment and moves in the space below the annular horizontal plane of the pump deck.

8. Equipment for inspecting and maintaining the area around the pump deck through which multiple diffusers containing the rotor blades of recirculation pumps that circulate cooling water internally in the reactor pressure vessel of a boiling water reactor pass, A conveying mechanism is erected inside the pump deck and transports the fitting portion in the vertical direction, A reactor inspection and maintenance device comprising: an end effector that is detachably coupled to the fitting portion and positions the mounted equipment below the annular horizontal plane of the pump deck.

9. In the reactor inspection and maintenance device according to any one of claims 1 to 3, 7 and 8, A reactor inspection and maintenance device equipped with a camera for capturing images of the area surrounding the pump deck.

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