KR200439485Y1 - Extension tube for sagging measurement instrument in heavy water nuclear reactor - Google Patents

Abstract

The present invention relates to equipment for measuring the position of a reactor tube installed in a heavy water reactor.

The present invention includes a first extension tube and a second extension tube connected to each other, one end of the first extension tube is formed with an extension tube is inserted into the second extension tube, one end of the second extension tube is inserted into the extension tube An extension tube end portion is formed, and the airtight retaining member interposed between the extension tube inner portion and the extension tube end portion and the extension tube inner portion and the extension tube end portion in a state where the extension tube inner portion is inserted into the extension tube end portion and maintained airtight. It characterized in that it further comprises.

Connecting Joint, Extension Pipe, Ball Screw

Description

EXTENSION TUBE FOR SAGGING MEASUREMENT INSTRUMENT IN HEAVY WATER NUCLEAR REACTOR}

1 is a view showing the configuration of the extension tube for nuclear reactor tube deflection inspection equipment according to an embodiment of the present invention.

Figure 2 is a cross-sectional view showing a cross-sectional view of the II 'of Figure 1 showing the configuration and coupling of the subject innovation.

3 is an enlarged cross-sectional view of the connection joint according to the present invention.

Figure 4 is a block diagram showing a first extension pipe according to the present invention.

<Description of the symbols for the main parts of the drawings>

1: connection joint 3: ball screw

5: Breakaway prevention hole 7: O-ring

9: Extension tube end 11: Extension tube inner part

13: hall 15: hinge

17: extension tube connection 21: connector insertion

23: second extension pipe 25: first extension pipe

29: connecting groove 31: connector

33: jacket

The present invention relates to equipment for measuring a reactor tube installed in a heavy water reactor, in particular to an extension pipe for inspection equipment for inspecting the deflection of the reactor tube in the heavy water reactor.

Nuclear power generation is divided into Pressurized Water Reactor (PWR), Boiling Water Reactor (BWR) and Pressurized Heavy Water Reactor (PHWR).

One of the reactors used in nuclear power plants is the heavy water reactor. This dehydrogen reactor has a cube-shaped structure in which a reactor is installed on top. Inside the structure, a Calandria shell, dimples, and a Calandria end are installed. In addition, a plurality of circular tubes, such as a feeder pipe and a calandria tube, are installed vertically or horizontally in the reactor. In addition, many of the pipes present in the heavy water reactor reactor installed in the nuclear power plant is radiated in a cylindrical reactor, which is not accessible to humans, so there is a problem in that the location of each pipe cannot be accurately inspected.

Due to these problems, an inspection method using ultrasonic waves has been proposed, but the measurement distance using ultrasonic waves is short and measurement in water is limited due to the attenuation of ultrasonic waves. In addition, the distance to be measured along the water pipe in the front of the heavy water reactor, which is a high-radiation zone, is 14m away from the work space above the heavy water reactor, which cannot be measured using conventional ultrasonic measurement methods. Various inspection apparatuses are placed in front of the tubes, and these tubes are connected to each other to insert the inspection apparatus into the reactor and measure it. To do this, it is necessary to continuously connect the extension pipes of about 2 m in the upper working space and to move the inspection apparatus to the reactor tube to be measured. However, because the inspection location is a high radiation area and the operator approaches the front of the reactor and inspects it by hand, the method of connecting and measuring the connecting tube should be made quickly. However, due to the worker's uncomfortable radiation work clothes and the surrounding situation, the connection between the connection tubes is difficult, so that the working time is delayed and the worker is exposed to radiation.

Therefore, the technical problem to be achieved by the present invention is to use the equipment for measuring the position of the reactor tubes installed in the heavy water reactor, and to the measurement position that takes the most time, so that the field personnel can conveniently use and minimize the radiation exposure. In order to maximize the work convenience and speed of the connection of the moving tube, the reactor tube deflection in the water reactor also provides an extension pipe device for inspection equipment.

And a first extension tube and a second extension tube connected to each other, one end of the first extension tube having an extension tube inner portion inserted into the second extension tube, and one end of the second extension tube with an extension tube end portion inserted into the extension tube. And an airtight holding member interposed between the extension tube inner part and the extension tube end part and the airtight holding member interposed between the extension tube inner part and the extension tube end part while the extension tube inner part is inserted into the extension tube end part. It is characterized by.

And it is preferable that the second extension tube is provided with a connector for transmitting a signal, the first extension tube is further provided with a connector insertion portion connected to the connector to receive a signal.
Preferably, the coupling part includes a ball screw coupled to a hole located inside the extension tube and a connection joint protruding by the ball screw.

In addition, it is preferable that the connection joint has a fan shape having a screw surface corresponding to the thread of the ball screw.

The hermetic holding member is preferably an O-ring.

The hermetic holding member is preferably arranged in two layers.

In addition, it is preferable that grease is filled between the hermetic holding members.

Other objects and advantages of the present invention in addition to the above object will become apparent from the detailed description of the following embodiments with reference to the accompanying drawings.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

1 is a view showing the configuration of the extension tube for nuclear reactor tube deflection inspection equipment according to an embodiment of the present invention, Figure 2 is a cross-sectional view showing a cross-sectional view of I 'of FIG.

1 and 2, the extension pipe for the reactor pipe deflection inspection equipment of the present invention is formed by the combination of the first extension pipe 25 and the second extension pipe (23).

The first extension tube 25 is formed of the extension tube inner portion 11 and the connector insertion portion 21.

Extension tube inner portion 11 is in contact with the inner side of the extension tube end portion 9 of the second extension tube 23 is coupled. In addition, the inner diameter of the second extension pipe 23 has the same shape as the cross-section, which is slightly smaller, and is connected to the extension pipe end portion 9 of the second extension pipe 23 by a fitting method. In addition, there is formed a hole (13) in which the ball screw (3) and the connection joint (1) are mounted to secure the coupling of the extension pipe. It is preferable that one or more of these holes 13 are formed at positions facing each other.

The connector inserting portion 21 is located in the center of the extension tube and is composed of a plurality of grooves into which the connector pins of the second extension tube 23 can be inserted, and are connected to various signal lines such as a camera, an illumination, an ultrasonic wave, and the like. In addition, the signal line in the extension pipe is made of radiation-resistant rubber, which is a radiation-resistant material, to prevent deterioration by radiation.

The second extension pipe 23 is composed of an extension pipe end portion 9 surrounding the extension pipe inner portion 11 of the first extension pipe and two O-rings 7 and a connector 31 to prevent the inflow of heavy water.

Extension tube end 9 is formed with a separation prevention hole (5) so that the connecting joint (1) protrudes and engages the extension tube end.

The separation prevention hole 5 is formed in the position which faces the hole 13 located in the extension pipe inner part 11 of the 1st extension pipe 25, respectively. Accordingly, when the first extension tube 25 and the second extension tube 23 are coupled, the connection joint 1 protrudes, and the protruding connection joint 1 is combined with the release preventing hole 5 to prevent the extension of the extension tube and to prevent twisting. Prevent it.

O-ring (7) is located at each of the two boundary surfaces that the extension tube end portion 9 and the extension tube inner portion 11 abut each one and has a round band shape. Therefore, when the extension pipe inner portion 11 is coupled while sliding, the rubber O-ring 7 is compressed to completely block the external material. This O-ring 7 blocks the heavy water flowing into the connector located in the extension pipe of the heavy water in the heavy water reactor with a high content of radiation. And between the two O-ring (7) and O-ring (7) is filled with grease to block the inflow of heavy water.

The connector 31 is formed with a connector pin that can be inserted into the connector inserting portion 21 of the first extension pipe 25. Therefore, the signal line is connected to the signal line by combining with the connector inserting portion 21.

3 is an enlarged cross-sectional view of the connection joint according to the present invention.

Referring to FIG. 3, the ball screw 3 has one side coupled to the hole 13, and the other side of which is formed with a triangular thread on the outside in the shape of a cylinder. The thread here may have a rectangular or trapezoidal shape.

The connecting joint 1 has a fan shape, and a circumferential surface of the connecting joint 1 has a triangular, square or trapezoidal screw surface engaging with the outer thread of the ball screw 3, and the other end is connected to the hinge 15. The connection joint 1 acts on the hinge 15 as an axis. The thread of the circumferential surface is engaged with the thread formed on the outer side of the ball screw 3. Therefore, the connection joint 1 transmits the rotational motion of the ball screw 3 to the screw of the connection joint 1 engaged with the ball screw 3 and acts as a worm gear that converts the linear motion into a linear motion. Therefore, when the ball screw 3 is turned clockwise, a part of the connection joint 1 comes out of the hole 13, and when the ball screw 3 is turned counterclockwise, the connection joint 1 which protrudes out is connected again. Will enter the hole (13). In addition, the rotation direction and the movement direction of the ball screw 3 may change. The connection joint 1 protruding in such a structure fixes the separation prevention hole 5 so that the connection between the extension tube and the extension tube is made more firm.

4 is a view showing a first extension pipe according to the present invention.

Referring to FIG. 4, the first extension tube 25 has a connector inserting portion 21 connected to various signal lines, a connecting groove 29 having a groove formed around the connector inserting portion, and an outer shell 33 protecting the outer portion of the extension tube. It consists of).

The connector inserting portion 21 is formed at the tip of the first extension tube, and a plurality of holes are formed like honeycombs.

The connection groove 29 is formed outside the connector insertion portion 21 to facilitate the coupling when the first extension pipe 25 and the second extension pipe 23 are coupled to each other.

The outer shell 33 is formed of aluminum to surround the outer tube and protect the radiation-resistant rubber surrounding the signal line connected to the connector inserting portion 21 and to withstand heavy water, which is high radiation.

Thus, the various measuring lines are located in the extension tube and are configured to connect them at once, and the connection between the extension tubes makes it easy to connect at once by using the connection joint (1).

According to the device of the present invention having the above configuration and action, it is the most time-consuming to use the equipment for measuring the position of the reactor tubes installed in the deuterium reactor to minimize the radiation exposure. It maximizes the speed and convenience of work on the connection part of the extension pipe that moves to the measuring position.

Although the present invention has been illustrated and described with respect to certain preferred embodiments, the present invention is not limited to these embodiments, and the present invention claims in the utility model registration claims of a person having ordinary knowledge in the technical field to which the present invention belongs. It includes all the various forms of modifications that can be carried out without departing from the spirit of the invention.

Claims (7)

A first extension pipe and a second extension pipe connected to each other, One end of the first extension tube is formed with an extension tube inner portion to be inserted into the second extension tube, One end of the second extension tube is formed with an extension tube end portion into which the extension tube inner portion is inserted, And an airtight retaining member interposed between the extension tube inner part and the extension tube end part while the extension tube inner part is inserted into the extension tube end part and interposed between the extension tube inner part and the extension tube end part to maintain airtightness. Extension tube for inspection equipment. The method of claim 1, The second extension pipe is provided with a connector for transmitting a signal, the first extension pipe is an extension pipe for the inspection equipment, characterized in that the connector is further provided with a connector connected to receive the signal. The method of claim 2, The coupling part is an extension pipe for the inspection equipment, characterized in that it comprises a ball screw coupled to the hole located in the inner portion of the extension pipe and a connection joint protruding by the ball screw. The method of claim 3, The connection joint, the extension pipe for inspection equipment, characterized in that it has a fan shape having a screw surface corresponding to the thread of the ball screw. The method of claim 4, wherein The hermetic holding member is an extension pipe for inspection equipment, characterized in that the O-ring. The method of claim 5, The hermetic holding member is an extension pipe for inspection equipment, characterized in that arranged in two layers. The method of claim 6, Extension pipe for inspection equipment, characterized in that the grease is filled between the hermetic holding member.

Images