JPS635299A - Core water tank for critical experiment with rotary type bottom plate - 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 [Technical Field of the Invention] The present invention relates to a core water tank for criticality experiments having a rotating bottom plate.

[Traditional technique]

As shown in FIG. 5, when performing a pρ field experiment with two first and second core vessels 2 and 3 housed in a core water tank l, conventionally one of the second core vessels 3 is placed in a straight line. to adjust the inter-core distance between the first core vessel 2 and the second core vessel 3 along a straight line within the range of inter-core distance = installation distance - soil movement distance S. It had become.

However, in the case where the distance between the cores is adjusted by moving along a straight line, there are the following problems.

In other words, if the bellows structure 4 is adopted for the movable part of the bottom plate as shown in Fig. 5, the structure will be complicated and expensive, and if the core water tank 1 becomes large, the stored water 6 will be used as a reflector. There was a problem in that the bellows structure 4 was deformed due to the increased hydrostatic pressure. ■Reactor core water P! ! It is necessary to provide an elongated slit-shaped opening corresponding to the travel distance S in the bottom plate of I, but with such an opening, the sealing structure becomes extremely difficult and the water in the core water tank L tends to leak. There was a point. (2) When the moving distance S becomes large, the flexible part of the drain line 5 of the core vessel 3 becomes long, and there is a problem that it is necessary to provide a large margin between it and the fixed piping side.

[Purpose of the invention]

The present invention was devised in view of the above-mentioned conventional circumstances and to solve these problems, and the distance between the cores of the two reactor core vessels can be adjusted by rotating the rotary bottom plate. The object of the present invention is to provide a core water tank for critical experiments that has a rotating bottom plate.

[Structure of the invention]

A critical experimental reactor core water tank having a rotary bottom plate according to the present invention which achieves the above object is provided with two rotary bottom plates arranged at a predetermined distance apart at the bottom of the reactor core water tank, each of which can be rotated and fixed. The core vessels are disposed at positions eccentric to the rotational axis, and the distance between the core vessels can be continuously adjusted and fixed by rotating the rotating bottom plate.

[Example] Hereinafter, drawings showing the present invention as an example will be described.

As shown in FIGS. 1A and 1B, a predetermined amount of water 11 is stored as a reflector in the core water tank 10, and this stored water 11 contains the first reactor core in which nuclear fuel solution is stored. A vessel 12 and a second core vessel 13 are installed, respectively, so that mutual interference experiments between these two core vessels can be carried out.

In this mutual interference experiment of the two core vessels, it is necessary to change the inter-core distance between the first core vessel 12 and the second core vessel 13 and conduct the experiment under various conditions. In the present invention, the distance between the cores can be adjusted by rotating the rotary bottom plate.

That is, the first core vessel 12 is provided with a drain line 14 below its center, and a fixing flange 15 is fixed around this drain line 14. 12 is the rotating bottom plate 1
6, and this rotary bottom plate 16 is fixed to a water tank bottom plate 17 of the core water tank 10 by a fixing device 40, which will be described later.

Further, a drain line 18 is provided below the center of the second core vessel 13, and 19 fixing flanges are fixed around this drain line 18. is fixed to a rotating bottom plate 16, and this rotating bottom plate 16 is connected to a fixing device 40, which will be described later.
It is fixed to the water tank bottom plate 17 of the core water tank 10.

And the drain line 1 which is the center of the first core vessel 12
4 and the drain line 1 which is the center of the second core vessel 13
8 is supported at a position offset from the rotation axis of the rotary bottom plate 16 by a distance #H.

Therefore, by rotating the - side (or both sides) of the rotating bottom plate 16, the first core vessel 12 and the second core vessel 1 can be rotated.
The inter-core distance between the two cores can be continuously changed and adjusted, thereby making it possible to obtain any desired inter-core distance within a predetermined range.

As shown in FIG.
A bottom plate gear 20, which shares the rotation axis K with the rotating bottom plate 16, is fixed below the rotating bottom plate 16. Further, in a gear box 21 fixed below the bottom plate 17 of the water tank, a transmission gear 22 that meshes with the bottom plate gear 20 is rotatably supported on a vertical shaft 23, and a drive gear that meshes with the transmission gear 22. 14 is fixed to a rotatably supported vertical shaft 25, and a rotating handle 26 is fixed to the protruding end of this vertical shaft 25.

Further, as shown in FIG. 3, a plurality of push-up devices 30 fixed to the lower surface of the aquarium bottom plate 17 are installed around the lower part of the rotary bottom plate 16, and the push-up devices 30 are configured as follows. It is composed of

That is, a bracket 32 is fixed to a pedestal 31 fixed to the lower surface of the aquarium bottom plate 17, and this bracket 32 has a push-up handle 33 that can be selectively switched between a solid line position and a chain line position, and a rotatable roller 34 at the tip. A push-up arm 35 is provided, and this push-up handle 33
By this operation, the push-up arm 35 is moved to the chain line position where it pushes up the bottom plate gear 20 and the solid line position where it hangs downward. Therefore, the upward movement of the push-up handle 33 moves the push-up arm 35 to the chain line position, and the roller 34, which has moved to the chain line position, can push up the rotary bottom plate 16 by the height T. ing.

Furthermore, as shown in FIG. 4, a plurality of fixing devices 40 are installed around the lower part of the rotating bottom plate 16 for crimping the rotating bottom plate 16 to the aquarium bottom plate 17. It is configured.

That is, a bracket 42 is fixed below a pedestal 41 fixed inside the bottom plate gear 20.
2 is provided with a clamp handle 43 and a clamp arm 44, and at the tip of the clamp arm 44, the overlapping surface 45 of the aquarium bottom plate 17 and the rotary bottom plate 16 is formed into a circular opening from below on the outside of the bottom plate gear 20. A crimping tool 48 is provided for crimping via a seal 46 such as an O-ring provided along the line, and this crimping tool 48 is connected to the clamp arm 44 via an adjustment screw portion that can adjust and fix the vertical position of the crimping tool 48. Further, a seat 47 corresponding to a crimping tool 48 is fixed to the bottom plate 17 of the aquarium. Therefore, the rotary bottom plate 16 after rotation can be crimped onto the water tank bottom plate 17 by this fixing device 40.

When changing and adjusting the inter-core distance between the first core vessel 12 and the second core vessel 13, the following procedure is performed. That is, after draining the water 11 in the core water tank 10 to the drain line 49, the clamp handles 43 of each of the plurality of fixing devices 40 are operated to press the rotary bottom plate 16 and the water tank bottom plate 17 together. Release.

Next, the push-up handles 33 of each of the plurality of push-up devices 30 are operated, and the rotary bottom plate 16 is pushed up by a height T from the tank bottom plate 17, as shown in FIG.

The rotating bottom plate 16 in this pushed-up state is supported by a plurality of rollers 34, so that it is in a rotatable state.

Therefore, by operating the rotation handle 26, the drive gear 24 and the transmission gear 22 are rotated, and the bottom plate gear 16 is rotated. Since it is rotated to the position, one of the second core vessels 13 in the eccentric position or both the first core vessel 12 and the second core vessel 13 can be easily moved and adjusted to a predetermined position.

After moving to a predetermined position, the rotating bottom plate 16 is lowered by reversely operating the push-up handles 33 of each pushing-up device 30, and the joint surface 45 of the lowered rotating bottom +ff116 is connected to the aquarium bottom plate 1.
7, the clamp handles 43 of each fixing device 40 are operated, and the overlapping surface 45 of the rotary bottom plate 16 is crimped to the water tank bottom plate 17 using the crimping tool 48, thereby completing the setting of the inter-core distance. At this point, the experiment can be started by storing water 11 in the core vessel 10 again.

Then, by rotating only the second core vessel 13, which is installed at a distance as shown in FIG. 1A, by 180 degrees as shown in FIG. 1B, distance between cores = installation path igL + eccentricity. An inter-core distance of distance H can be obtained, and both the first core vessel 12 and the second core vessel 13, which are installed at a distance from each other, can be
By rotating by 80 degrees, it is possible to obtain an inter-core distance of: inter-core distance = installation distance - earth core distance HX2.

In addition, when performing experiments on the core vessel base, a blind flange with the same dimensions as the fixing flange 15 or 19 is attached to the rotating bottom Vi.
It is sufficient to fix it to 16.

Therefore, in the present invention, by rotating the rotary bottom plate 16, one of the first core vessels 12 supported at a position offset by a distance H from the rotation axis of the rotary bottom plate 16, or both first cores The vessel 12 and the second core vessel 13 can be moved, so that the distance between the core vessels 12 and 13 facing each other can be continuously changed and adjusted with a simple structure and simple operation.

Moreover, when adjusting the distance between the cores, the core vessel 12
Alternatively, by moving the drain line 13 around the rotation axis of the rotating bottom plate 16, the moving distance of the drain line 14 or 18 can be reduced, so the flexible part connected to this can be shortened, and the fixed piping Reduce the space between the sides (can be done).

Since the opening of the aquarium bottom plate 17 can be opened circularly as the rotating bottom plate 16 rotates, an O-ring or the like can be used as the seal 46 provided along the opening, thereby making the aquarium bottom plate 17 and the rotating bottom plate 16 can be easily and reliably formed.

〔Effect of the invention〕

In short, the core water tank for critical experiments having a rotary bottom plate according to the present invention has a predetermined path at the bottom of the core water tank.

Two rotary bottom plates placed apart are provided so that they can be rotated and fixed, and a core vessel is placed in a position eccentric to the axis of rotation of each of the rotary bottom plates. Since the distance between the cores can be continuously adjusted and fixed, by rotating the rotary bottom plate around its rotation axis, it is possible to move the core vessel placed at an eccentric position on the rotary bottom plate. It has a structure that makes it easy to reduce the distance between cores.
And it can be changed continuously with simple operations.

Moreover, since the rotating bottom plate rotates, the opening at the bottom of the aquarium can be opened in a circular shape, so the seal provided along the opening can be
A ring or the like can be used, and thereby the sealing structure between the aquarium bottom plate and the rotating bottom plate can be easily and reliably achieved.

Furthermore, by moving the reactor core vessel around the rotation axis of the rotating bottom plate, the moving distance of the drain line can be reduced, so the flexible part connected to it can be shortened, and the fixed piping side can be shortened. You can reduce the margin in between.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG.
1B is a longitudinal sectional view showing the inside of the core water tank, FIG. 1B is an explanatory diagram showing the operation of one rotating bottom plate rotated 180 degrees, FIG. 2 is an enlarged longitudinal sectional view showing the rotation device of the rotating bottom plate, and FIG. 3 FIG. 4 is an enlarged longitudinal sectional view showing a pushing up device, FIG. 4 is an enlarged longitudinal sectional view showing a fixing device, and FIG. 5 is a longitudinal sectional view showing the inside of a conventional reactor core water tank. DESCRIPTION OF SYMBOLS 10... Core vessel, II... Water, 12... First core vessel, 13... Second core vessel, 14... Drain line, 16... Rotating bottom plate, 17... Water tank Bottom plate, 18
...Drain line, 30...Pushing device, 40...
・Fixing device, K...Rotation axis center.

Claims (1)

[Claims] Two rotating bottom plates are installed at a predetermined distance from each other at the bottom of the reactor core water tank so that they can be rotated and fixed, and a core vessel is placed eccentrically from the rotational axis of each rotating bottom plate. 1. A reactor core water tank for critical experiments having a rotary bottom plate, characterized in that the distance between the cores of the core vessel can be continuously adjusted and fixed by rotating the bottom plate.