JPS63157099A - Fuel taking-in-out device for nuclear reactor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention targets, for example, a sodium-cooled fast breeder reactor, and relates to a reactor vessel and an external reactor on the side of fuel handling equipment built adjacent to the reactor vessel. The present invention relates to a fuel inlet/output device that transfers fuel to and from a relay tank.

[Conventional technology]

As this type of fuel inlet/output device, a mobile intra-cell fuel transfer device is installed in a hot cell constructed between the reactor vessel and the fuel handling equipment outside the reactor, and the fuel is transferred to the reactor vessel via the fuel transfer device. and the removal of spent fuel between the
A transfer cell system that transports new fuel is
For example, it is known from Japanese Utility Model Application Publication No. 58-57800.

[Problem that the invention seeks to solve]

By the way, in the above-mentioned transfer cell type fuel inlet/output device,
There are the following disadvantages in fuel handling.

That is, (1) a large-volume hot cell with an inert gas atmosphere inside and a device for adjusting the atmosphere inside the cell are required, which increases the size of the device and increases equipment costs.

(2) Furthermore, since the mobile fuel transfer device is installed inside the hot cell, it is not easy to access the fuel transfer device from the outside, and for this reason, it is difficult to house the manipulator and fuel transfer device in terms of maintenance. This requires additional equipment such as a maintenance cask for transporting the fuel to equipment cleaning equipment outside the hot cell, and repair work for the fuel transfer machine will also be a major loss.

The purpose of this invention is to simplify and downsize the device and improve maintainability by installing it in the air atmosphere outside the furnace and allowing fuel to be taken in, out, and delivered without the need for a large hot cell. It is an object of the present invention to provide a fuel inlet/output device which can also be used.

[Means for solving problems]

In order to solve the above-mentioned problems, according to the present invention, the container is equipped with a door valve at the lower end and the inside thereof is used as a real cell area, and the top of the container is pivotally supported on a support frame to swing in a pendulum manner. A movably supported shielding tube for storing fuel, a fuel lifting device installed on the top of the FA shielding tube, and a transfer chute on the furnace vessel side and a transfer shade on the outside relay tank side that connect the shielding tube with respect to the support frame. and a swing drive device that swings between the fuel inlet and outlet device.

[Effect]

In the above configuration, when transferring fuel between the reactor vessel and the reactor vessel, the shield cylinder is first swung by the swing drive device to a position facing the transfer chute on the reactor vessel side, and then the shield cylinder is moved to a position opposite to the transfer chute on the other side. After connecting the door valve to the furnace, operate the fuel lifting device to transfer fuel to and from the furnace, or to transfer fuel to and from the external relay tank. By performing the same operation as described above with the external relay tank, the shielding tube that serves as a fuel receiver is swung between the reactor vessel side and the external relay tank side. By operating the fuel lift device mounted on the shield tube, fuel can be taken in, taken out, and delivered.

〔Example〕

Figures 1 and 2 show the configuration of a fuel inlet/output device according to an embodiment of the present invention when it is installed in a nuclear reactor. In the figures, 1 is a reactor vessel housing a reactor core 2, and 3 is a reactor vessel. An extra-core relay tank 5 installed on the fuel handling cell 3 side constructed adjacent to the reactor vessel 1 is a fuel inlet/output device that transfers fuel between the reactor vessel 1 and the extra-core relay tank 3.

Here, the fuel inlet/output device 5 includes a shielding cylinder 7 for containing fuel, which is a closed container equipped with a door valve 6 at its lower end and whose interior is a hot cell area with an inert gas atmosphere.
A horizontal support frame 8 that pivotally supports the top of the shielding cylinder 7 and suspends it so that it can swing in a pendulum manner, and the shielding cylinder 7
The reactor vessel is constructed as an assembly of a fuel lifting device 9 installed at the top of the reactor vessel, and a swing drive device 10 that swings the shield cylinder 7 in the direction of arrow A on the support frame about the top pivot point. It is installed on the floor above. The shield cylinder 7 is removably pivotally connected to the support frame 8 via a trunnion 81 attached to the support frame 8, as shown in FIG. It is a chain elevator mechanism that suspends a stored fuel bucket 91 and lifts and lowers it in the direction of arrow B, and one swing drive device 10 includes a rack disposed on the support frame side along a shielding tube swinging path in the direction of arrow A. A pinion is provided on a shielding tube that engages with the rack, and the pinion is driven from the shielding tube.

Furthermore, the furnace vessel 1. The fuel inlet/output device 5 is installed in the relay tank 3 outside the reactor, respectively, with a transfer chute 11.31 in an inclined arrangement pulled out toward the floor side, and a movable guide cylinder 12.32 at the upper end of the transfer chute 11.31.
It is equipped with a door valve 13°33 attached through the door.

Next, the fuel loading/unloading and delivery operations with the above configuration will be explained. First, as a fuel transfer route, new fuel is delivered to the fuel loading/unloading device 5 in the external relay tank 3, and is carried into the reactor vessel 1 from here via the fuel loading/unloading device 5. On the other hand, spent fuel taken out from the reactor core 2 by the fuel exchanger inside the reactor is delivered to the fuel loading/unloading device 5 within the reactor vessel 1, and from there is carried out to the external relay tank 3 via the fuel loading/unloading device. An intra-cell transfer device is provided inside the fuel handling cell 4, and fuel is transferred between the external relay tank 3 and various fuel handling equipment (not shown) via the transfer device.

Here, the fuel cost due to the fuel loading/unloading rIt5 will be explained in detail. To convey the spent fuel to the external relay tank 3, first the shield cylinder 7 is moved to the right side by the swing drive device 10 as shown in the figure. A swinging operation is performed to make the door pulp 6 face the door pulp 13 of the transfer chute 11 on the other side. Here, the door pulps 6 and 13 are connected and opened,
By operating the fuel lifting device 9, the fuel bucket 91 is lowered through the transfer shade 11 to the position shown by the chain line in the reactor vessel l. Next, the spent fuel taken out from the core by the fuel exchanger inside the reactor is inserted into the fuel bucket 91. death,
Subsequently, the fuel bucket 91 is lifted together with the spent fuel and collected into the shield tube 7. Here door pulp 6 and 1
3 is closed, the two are separated, and the shield tube 7 is swung toward the outside relay tank 3 side by the swing drive device 10, and the door pulp 33 of the other side transfer chute 31 and the door pulp 6 of the shield tube are connected. Connect and open between. Next, the fuel bucket 91 containing spent fuel is lowered by operating the fuel lifting device 9 and transferred to the transfer chute 31.
The fuel bucket 9 is landed in the outside relay tank 3 through the fuel bucket 9 by operating the gripper of the intra-cell transfer machine (not shown).
The spent fuel is taken out from the reactor 1. In contrast, new fuel is carried into the reactor through the reverse procedure of the spent fuel removal described above, from the external relay tank 3 to the reactor vessel via the fuel inlet/output device 5. It is carried into 1.

Although the illustrated embodiment shows that the fuel lifting device 9 is equipped with a fuel bucket 91, it is also possible to lift the fuel by directly gripping the fuel with a gripper without using a fuel bucket.

〔Effect of the invention〕

As described above, according to the present invention, the container is equipped with a door pulp at the lower end and has a hot cell area inside, and the top of the container is pivotally supported on a support frame so as to be swingable in a pendulum manner. A shield cylinder for storing fuel,
A fuel lifting device mounted on the top of the shielding tube, and a swing drive device for swinging the shielding tube between the transfer chute on the furnace vessel side and the transfer chute on the outside relay tank side with respect to the support frame. By configuring the fuel inlet/output device, it is no longer necessary to construct a large hot cell like in the conventional intra-cell transfer method, and the hot cell area inside the shielding cylinder is minimized.

Therefore, it becomes easy to adjust and manage the inert gas atmosphere within the hot cell. In addition, since the shielding tube itself constitutes a hot cell area, the fuel inlet/output device can be installed in the air atmosphere outside the reactor, making it easy for maintenance personnel to access it. By removably supporting the structure, there are advantages such as being able to easily handle repair work without requiring additional equipment such as a mani break or maintenance cask.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the configuration of a fuel inlet/output device according to an embodiment of the present invention showing the installation state in a nuclear reactor, and FIG. 2 is a top side view of the fuel inlet/output device in FIG. 1. In each figure, l: reactor vessel, 3: external relay tank, 5: fuel inlet/out device,
6; door pulp, 7: shielding tube, 8: support frame, 9
: Fuel lifting device, 10: Swing drive device, 11.3x
: ) Lance Fa Chute, 91: Fuel Bucket, A:
Direction of swing operation of the shield cylinder, B: Direction of fuel lifting/lowering operation.

Claims (1)

[Scope of Claims] 1) A fuel inlet/output device that transfers fuel between a reactor vessel and an external relay tank on the side of fuel handling equipment adjacent to the reactor vessel, which is equipped with a door valve at the lower end. A shielding tube for storing fuel, which is a sealed container with a hot cell area inside, and whose top is pivoted on a support frame so that it can swing freely in a pendulum manner, and a fuel storage tube equipped at the top of the shielding tube. A nuclear reactor comprising: an elevating device; and a swing drive device that swings the shield cylinder between the transfer chute on the reactor vessel side and the transfer chute on the external relay tank side with respect to the support frame. Fuel inlet/output device. 2) A fuel inlet/output device for a nuclear reactor as claimed in claim 1, wherein the shielding tube is removably pivoted via a support frame trunnion. 3) A fuel inlet/output device for a nuclear reactor according to claim 1, wherein the fuel lifting device is a chain elevator mechanism that suspends a fuel bucket and lifts and lowers the fuel bucket.