JPS6333194Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a nuclear reactor well differential user device provided on the wall surface of a nuclear reactor well.

[Technical background of the invention and its problems]

The reactor well def user tube is installed on the wall of the reactor well, and discharges water to keep the temperature of the water stretched to the top of the reactor well constant in each layer during fuel exchange, etc. It is installed for the purpose of circulating water.

Conventionally, as shown in FIG. 1, a reactor well differential user device has a pair of differential user tubes 2 facing each other and protruding from a reactor well wall 1, and the differential user tubes 2 are buried in the reactor well wall 1. It is connected to the water guide pipe 3.

Note that the reference numeral 5 in the figure shows the state in which the upper cover of the reactor pressure vessel has been removed, and the reactor core 6 is inside the pressure vessel 5.
is located.

The differential user pipe 2 is provided with a plurality of discharge holes 4 as shown in FIG. 2, and the flow of spray water from the discharge holes 4 is made uniform.

By the way, with automatic reactor well wall 1 cleaning equipment or cleaning work performed by workers,
When cleaning and decontaminating one side of the reactor well wall, the defuser tube 2 protruding from the first side of the reactor well wall became an obstacle, and there was a drawback that the reactor well wall could not be sufficiently decontaminated and cleaned. .

[Purpose of invention]

The present invention was made to eliminate the above-mentioned drawbacks, and its purpose is to provide a differential user device for a boiling water reactor well that can uniformly and easily clean and decontaminate the wall surface of a reactor well. It is about providing.

[Summary of the idea]

In order to achieve the above object, the present invention embeds the defuser tube, which is provided protruding from the reactor well wall, into the reactor well wall.
This is a boiling water well defuser device that removes protrusions from the reactor well wall and facilitates cleaning and decontamination of the reactor well wall.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 3 to 7.

In FIG. 3, the same parts as in FIG. 1 are denoted by the same reference numerals, and explanations of overlapping parts will be omitted.

That is, a water guide pipe 3 is embedded in the reactor well wall 1, and a flat water guide container 10 is connected to the tip of the water guide pipe 3.

As shown in FIG. 4, four water guide containers 10 are provided on the inner surface of the well wall 1 flush with each other and spaced at approximately equal intervals.

Further, as shown in FIG. 5, a current plate 11 is disposed approximately at the center of the water guide container 10. Furthermore, as shown in FIG. 6, a flat plate 12 is provided on the surface of the water guide container 10, and a large number of discharge holes 13 are provided in the flat plate 12.

The flat plate 12 is fixed to the current plate 11 with bolts 14, as partially shown in FIG.

As mentioned above, the present invention embeds water guide pipes 3 in the reactor well wall from all sides, and in order to direct the flow of water from side to side just before the reactor well wall, the pipes 3
A rectifier plate 11 is attached to a flat plate 12 at the outlet of the outlet.

A plurality of discharge holes 1 having a configuration similar to the surface of the differential user pipe 2 shown in FIG.
3 are bored in the flat plate 12.

This flat plate 12 is formed to be detachable so that work such as decontamination and internal inspection inside the water guide vessel 10 can be easily performed, and has a structure that can be fixed to one surface of the reactor well wall with fasteners such as bolts 14. It's summery.

Furthermore, the structure is such that fasteners such as bolts 14 do not protrude beyond one surface of the reactor well wall.

The flow of water in the device described above takes place in the following manner.

During fuel exchange work, water is poured into the reactor well wall 1.
Stretch it to the top.

Water is supplied from water guide pipes 3 on all sides of the reactor well wall 1 toward a water guide container 10 .

The water that has reached the outlet of the water guide pipe 3 passes through the rectifier plate 11
The water spreads to the left and right and is guided to the water guide container 10.

The water is discharged from the water guide vessel 10 into the reactor well through a flat plate 12 having discharge holes 13.

The water circulates within the reactor well to maintain a constant water temperature in each layer within the reactor well.

[Effect of idea]

As explained above, according to the present invention, by configuring the flat water guide container 10 corresponding to the reactor well def user tube 2, which conventionally protrudes from the reactor well wall 1, to be embedded in the reactor well wall,
There are no protruding parts from the reactor well wall, making it flush. Therefore, there is an effect that the reactor well wall surface cleaning equipment or the workers can clean and decontaminate the reactor well wall surface evenly and easily.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view for explaining a conventional reactor well differential user device, FIG. 2 is a perspective view showing the differential user tube in FIG. 1, and FIG. 3 is a reactor well differential user device according to the present invention. A schematic sectional view for explaining one embodiment, FIG. 4 is a top view of FIG. 3, FIG. 5 is a side view showing the differential user tube in FIG. 3, and the sixth surface is a front view of FIG. 5. FIG. 7 is a partially sectional view showing an enlarged main part in FIG. 5. FIG. 1... Reactor well wall, 2... Defuser tube,
3... Water guide pipe, 4... Discharge hole, 5... Reactor pressure vessel, 6... Reactor core, 10... Flat water guide vessel,
11... Rectifying plate, 12... Flat plate, 13...
Discharge hole, 14... bolt.

Claims (1)

[Scope of utility model registration request] A water guide container is installed in connection with the water guide pipe buried in the reactor well wall, and the surface of this water guide container is closed with a smooth plate with many ejection holes, and the water is rectified on the inner surface of the approximately central part of the flat surface of this smooth plate. A differential user device for a boiling water reactor well, characterized in that a plate is arranged.