JPS6276499A - Irradiation cylinder 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 The present invention relates to the improvement of irradiation tubes for nuclear reactors, and more specifically, the present invention relates to the improvement of irradiation tubes for nuclear reactors. or,
This invention relates to the improvement of an irradiation tube that serves as a sample irradiation site within a nuclear reactor in order to prevent changes in physical properties, etc., and to produce radioisotopes.

The irradiation tube according to the present invention has a container (hereinafter referred to as rabbit) containing a plurality of samples by attaching all dedicated flow channels for providing a flow of gas or liquid in the sample extraction direction.
All features allow for individual removal of all.

As shown in Fig. 1, the conventional irradiation tube has a rabbit (inner tube (4) with a guide tube (1) that guides the rabbit (1, 01) into the irradiation tube, Rabbit). A seat (2) provided at the bottom of the inner cylinder with porous holes through which gas or liquid can freely pass, an outer cylinder (3) surrounding the inner cylinder 4 to form a complete outer flow path, and an outer cylinder. It is composed of a conduit (5) etc. that are connected and guide the fluid between the inner cylinder and the outer cylinder to the outside.

This irradiation tube is installed in the nuclear reactor 60).

The rabbit is sent into the irradiation cylinder through the guide tube by the transport fluid. If you insert multiple rabbits, the rabbits will be stacked.

Rabbits) When taking out k, the flow of fluid is reversed, but all rabbits stacked in stacks are taken out at the same time. In such an irradiation tube, it is required to irradiate the sample at various times, but in the conventional technology described above, because the irradiation tube has the structure described above, it is possible to irradiate the sample individually by changing the insertion time of the rabbit. The irradiation time of the sample was adjusted. However, since all the rabbits can only be taken out at the same time, the number of irradiations even for samples with short irradiation times is dominated by the number of samples with long irradiation times, which has the disadvantage that efficient irradiation cannot be performed.Improvement is desired. was.

Purpose of the Invention The purpose of the present invention is to improve the drawbacks of the prior art as described above by making it possible to insert and take out a sample with a short irradiation time into the irradiation tube independently of a sample with a long irradiation time, and to increase the number of irradiation times. The aim is to provide all the irradiation cylinders of nuclear reactors that contribute to the improvement of nuclear power generation.

In the present invention, the inner cylinder and the outer cylinder are divided into a plurality of partition chambers, and the inner cylinder is provided with holes, thereby forming a plurality of flow paths.

Example An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 01) indicates the entire inner cylinder, and this inner cylinder is located at the center of the irradiation cylinder. A receiving seat (2) of the rabbit 00) is arranged at the bottom of the inner cylinder αD. This seat is provided with many holes (Fig. 8) to allow fluid to flow freely.

The upper part (8) of the inner cylinder OI) is connected to external piping, allows fluid to enter and exit, and at the same time serves as a guide cylinder for the rabbit.

An outer cylinder 02 is disposed on the outside of the inner cylinder qυ, and between the inner cylinder Ql) and the outer cylinder 02) are three ribs 05) (the ribs 05) arranged so as to be equally divided into three in the circumferential direction. 6) into three partitions (20, 21, 22). In the illustrated embodiment, the three ribs 05) are integrally molded with the inner cylinder (11) and the outer cylinder (IZ).
21) is provided with a bottom plate (7). Therefore, the partitions (20, 21, 22) are formed as completely independent partitions from each other.

There are three continuous pipes (6A, 6B and 6) at the top of the outer cylinder 02).
c) are connected, and these continuous pipes are connected to external piping for fluid inflow and outflow. 3 connecting pipes (6A.

6B and 6C) each have three partitions (20, 2L).
, 22). The partition chambers 20, 2r communicate with the inside of the inner cylinder through holes (30, 31) provided in the inner cylinder Oυ, respectively.

FIG. 3 shows the removal of the top rabbit. First, connecting pipe (6A)' (through r to partition room 00)
Introduce all the fluid to the The introduced fluid flows into the inner cylinder through the hole raised in the inner cylinder (11). This hole (3
0) is the position between the top rabbit and the middle rabbit.
In addition, the fluid from the hole (30) is divided into upper and lower parts and flows here. The upward flow passes by the top rabbit, passes through the guide tube (8) at the top of the inner cylinder, and exits the irradiation cylinder.

This flow creates a pressure difference in the top rabbit where the pressure above is υ lower than the pressure below.

As a result, the rabbit rises under pressure from below and is taken out of the irradiation tube through the guide tube (8).

On the other hand, when the downward flow passes by the side of the rabbit that was left behind (((The inside fl
It flows into the partition chamber through the porous hole 03) of the seat (2) of 1, 1) and exits from the connecting pipe (6C).

The intermediate rabbit can be removed in the same manner as described above by tying the partitions (21, 22) together, so a description thereof will be omitted. The rabbit at the bottom can be taken out by connecting the flow path that is introduced from the connecting pipe (6C) and flows out from the guide pipe (8) at the upper part of the inner cylinder. This is similar to the conventional method.

In FIG. 11, the entire formation of the conduit for the rabbit removal mentioned above will be explained. Take out the top rabbit.

Directional switching valve 160i' (c-take out position), line (46) and t40 are fully connected. Next, the valve (6υ) is opened to allow the fluid to flow into the partition chamber (20), and the upward flow of the cylinder is returned from the line (41) to the line (47). Similarly, the downward flow is caused by opening the valve 164Jk. Returns from partition 0 to line (41-) to line (shun).

However, in this case, the valves t6Zl and (cry) are closed.

To take out the middle rabbit, open the box tb21'i and open the partition +
21), and the flow toward the same upper part of the cylinder is through the line (
・From 1υ it returns to the line (phrase. Similarly, the downward flow is caused by opening valve t671) and connecting it from partition 9FCδ to line (i
J Go back to the line (I7) with M. However, the square (bυ and (6
3) is closed.

To take out the rabbit at the bottom, open the valve +631"x to send all the fluid to the partition chamber 03, and open the valves (6υ, i6Z and (shi4)
) is closed.

Incidentally, reference numeral 70 is a device for fully inserting or removing the rabbit.

Effects of the Invention According to the present invention, as described above, since the upper rabbit can be inserted and removed at will without affecting the lower rabbit, the total number of irradiation times for the sample can be increased. In addition to improving the utilization efficiency of the irradiation tube, by forming individual extraction channels between the inner and outer tubes, the irradiation tube does not have a complicated external shape, making it easier to install and replace in nuclear reactors, etc. . Furthermore, there are many practical benefits such as the fact that the remaining rabbits are not sufficiently cooled while the rabbits are being removed.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view of a conventional irradiation tube, Fig. 2 is a schematic sectional view of an irradiation tube according to the present invention, Fig. 3 is a partial sectional view showing the state in which the rabbit gold at the top is taken out, and Fig. Figure 4 is a partial cross-sectional view showing the state in which the middle rabbit gold is being taken out, Figure 5 is a cross-sectional view of the E-E cut 1 in Figure 1, Figure 6 is a cross-sectional view taken along the line A-A in Figure 1, Figure 7 is a sectional view taken along line B-B in Figure 1, Figure 8 is a sectional view taken along line C-C in Figure 1, Figure 9 is a sectional view taken along line D-D in Figure 7, and Figure 10 is a sectional view taken along line D-D in Figure 7. FIG. 11 is a developed view of the cylinder, FIG. 11 is a flow path system diagram, and FIG. 12 is an explanatory diagram showing one operating state of the directional control valve. 10... Rabbit 11... Inner cylinder L2... Outer cylinder 20.21, 22... Partition chamber 30.31... Hole (
(5 people outside) Drawing dispute D (no change in -'F) Figure 1 Construction Figure 7 Figure 8 η Figure 10 Procedural amendment (method) 6. Relationship with the case of the person making the amendment Applicant address name♀! p (+7.O?) Japan Atomic Energy Research Institute (Tato
Ig) 4. Agent

Claims (1)

[Claims] an outer cylinder, an inner cylinder inserted into the outer cylinder and in which a plurality of rabbits are arranged one on top of the other, a plurality of independent partitions provided between the outer cylinder and the inner cylinder, and a plurality of independent partitions in the inner cylinder. An irradiation tube for a nuclear reactor, comprising a plurality of holes provided, the plurality of holes being arranged between the rabbits.