KR101744475B1 - Capsule bottom assembly for a long period irradiation testing in research reactor - Google Patents

Abstract

The present invention relates to a capsular lower end assembly for a long term irradiation test using an irradiation hole in a study, and is characterized in that a capsule end portion assembly for a long term irradiation test using an irradiation hole is formed in a hollow cylindrical shape, A locking groove is formed in the lower side of the irradiation hole to receive the fixing device installed at the lower end of the irradiation hole and is formed in a hollow cylindrical shape so as to form a passage through which the cooling water flowing from the lower side of the irradiation hole passes. A washer which is fitted to the outer circumferential surface of the body part and is installed adjacent to the bottom surface of the body part, an elastic spring which is fitted to the outer circumferential surface of the body part and fixed to the washer at the lower side thereof, And is slid to the inner side of the lower end of the irradiation hole And a bushing fixed to the head to support the washer so that the washer is disposed adjacent to the bottom of the head. Thus, the fatigue caused by the fluid induced vibration due to the rapid flow velocity in the irradiation hole during the long period irradiation test Thereby remarkably reducing the possibility of destruction.

Description

Technical Field [0001] The present invention relates to a capsule bottom assembly for a long term irradiation test using an irradiation ball,

[0001] The present invention relates to a capsule lower end assembly for a long term irradiation test using an irradiation hole in a research field, more specifically, a structure replacing a conventional rod tip is proposed and the possibility of fatigue failure due to fluid induced vibration in the irradiation hole is remarkably reduced The present invention relates to a lower end capsule assembly for a long term irradiation test using an irradiation hole in a research field.

Facilities for conducting research tests of nuclear fuel and nuclear materials using research furnaces include non-instrumented capsules, instrumented capsules and loops.

In particular, the in-furnace survey data of pressure vessel materials related to the extension of the life of commercial nuclear reactors, in-house survey data of core materials for pressure vessels for the development of new materials, furnace survey data on the development of new fuel materials and cladding materials for pressurized water reactors, In order to acquire in-situ survey data related to the development of nuclear fuel and new cladding material, research tests using research furnaces have become active.

Among these, the instrument capsule is a capsule in which various measuring devices are installed to secure the characteristics (fuel temperature, nuclear fuel pressure, nuclear fuel transformation, etc.) and history data (cooling water temperature, flow rate and flow rate) The instrument capsule is a capsule in which a separate measuring device is not installed.

Hereinafter, the meaning of a capsule in an apparatus according to the present invention is defined as a concept including both a instrument capsule and a non-instrument capsule.

In this regard, Korean Patent Registration No. 0435226 (Patent Document 1) and Korean Patent Registration No. 0613581 (Patent Document 2) have been disclosed as prior art related to the capsule assembly.

In the conventional capsule assembly including the patent documents 1 and 2, when the user inserts the rod tip constituting the lower end of the capsule into the insertion hole formed in the fixing device provided on the bottom of the irradiation hole, .

That is, the conventional rod tip includes a body lower end portion having a sharp shape as a whole, a body stop portion having a wing portion projected outward from the center of the body, and a rod-shaped body upper portion as a whole, The capsule mounting function is performed by inserting the bottom portion of the body and the body stopper integrally through the insertion hole formed in the fixing device and then rotating the body to hang the wing portion on one side of the back surface of the fixing device.

However, since the rod tip constituting the conventional capsule lower end assembly includes a lower portion having a sharp shape similar to the end portion of the pencil and a wing portion protruding outward from the center of the body, the sectional area of the rod tip is smaller than that of the capsule upper end assembly, There is a problem that fatigue failure occurs due to fluid induced vibration due to a rapid flow velocity in the irradiation hole.

That is, the rod tip constituting the lower end portion of the capsule has a problem that the upper end portion of the rod tip body is broken by the fluid induced vibration during the long term irradiation test using the irradiation hole in the study.

Korean Patent No. 0435226 Korea Patent No. 0613581

It is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to provide a structure in which a lock groove is formed in a lower end of a hollow cylindrical body having an outer diameter substantially similar to that of the capsule upper end assembly, The present invention also provides a capsule bottom end assembly for a long term irradiation test using an irradiation hole in a study in which a conventional rod tip is removed.

It is also an object of the present invention to provide a capsule bottom assembly for a long term irradiation test using an irradiation hole in which the possibility of fatigue failure due to fluid induced vibration due to a rapid flow velocity in the irradiation hole is remarkably reduced during a long term irradiation test.

It is another object of the present invention to provide a capsule lower end assembly for a long term irradiation test using an irradiation hole in which a flow path for supplying cooling water is formed inside and / or outside the capsule upper end assembly according to the purpose of irradiation test.

The capsule bottom end assembly for a long term irradiation test using the irradiation hole according to the embodiment of the present invention is characterized in that the capsule upper end assembly using the irradiation hole of the research furnace is formed into a hollow cylinder- A lock groove is formed to extend downward from the head to a structure having an outer diameter smaller than that of the head, and a fixing device provided at the lower end of the irradiation hole is inserted and inserted into the cavity, and a hollow cylindrical shape A washer which is fitted to the outer circumferential surface of the body portion and is provided adjacent to the bottom surface of the head portion, an elastic spring which is fitted to the outer circumferential surface of the body portion and is fixed to the washer at the lower side thereof, And slide on the inner side of the lower part of the irradiation hole The guide bushing is a slope is formed, and the support washer so that the washer installed adjacent to the bottom surface of the head and is configured to include a bushing that is fixed to the head.

In this case, the head portion may include at least one cooling water flow path for transmitting the cooling water delivered from the body portion to the outside of the capsule upper end portion.

In this case, the cooling water flow path portion may include a first flow path formed on the inner circumferential surface of the head portion and a second flow path formed on the outer peripheral surface of the head portion to communicate with the first flow path.

In addition, the head portion may further include a cooling water flow path blocking portion formed to extend from the center of the toe along the inner circumferential surface of the inner surface of the first passage air side to block the flow path of the cooling water transferred from the body portion to the inside of the capsule upper end assembly .

Further, it is preferable that the first flow hole is formed at a position higher than the second flow hole.

In particular, it is preferable that the cooling water flow path portion is provided radially with five radial lines along the circumference of the head portion, when the irradiation hole of the study is provided by a hexagonal flow tube.

On the other hand, it is preferable that the fixing device is formed in a bar shape and installed at the lower end of the irradiation hole.

In addition, the locking grooves include a pair of first grooves symmetrically provided so that both ends of the fixing device are accommodated when the body is pressed downward, and both ends of the fixing device when the body is rotated in the downward direction, A pair of second grooves formed to extend in a first groove so as to be movable along the inner side of the upper side and symmetrically provided to each other, and a pair of second grooves which are symmetrically provided on both ends of the fixing device, when the pressing force applied to the body is released, And a pair of third grooves formed to extend in the second groove so as to be accommodated in the first groove and symmetrically provided in the second groove.

In this case, it is preferable that the first groove is formed in the vertical direction, the second groove is formed in the first groove in the horizontal direction, and the third groove is formed in the second groove in the lower vertical direction.

On the other hand, it is preferable that the washer is interposed with a predetermined clearance space between the head and the bushing.

In addition, the washer has a first step groove along its circumference at the lower part of its outer circumference, and a bushing has a second step groove along the circumference thereof at the upper part of the inner circumference thereof so that the top face of the first step groove and the bottom face of the second step groove It is preferred that the bushing be in contact with and support the washer.

At this time, it is preferable that the inner wall of the second step groove and the upper surface of the outer circumference of the washer are spaced apart from each other by a predetermined distance.

In this case, it is preferable that the height of the inner wall of the first step groove is larger than the height of the inner peripheral surface of the bushing.

On the other hand, the elastic spring can be fixed to the washer by welding.

In addition, the guide bushing preferably comprises a hollow cylindrical body and a flange portion provided along the periphery of the outer peripheral surface of the body.

At this time, it is preferable that the flange portion is formed with a spring receiving groove in which the elastic spring is received and seated on the upper surface.

Further, it is preferable that the flange portion is formed so as to be gradually thinner in thickness downward, and has a sloped surface.

On the other hand, the guide bushing can be fixed to the elastic spring by a welding method.

In addition, the bushing can be fixed to the head by welding.

As described above, the capsule bottom end assembly for the long term irradiation test using the irradiation hole according to the present invention has a lock groove formed at the lower end of the hollow cylindrical body having an outer diameter substantially similar to that of the capsule upper end assembly, A structure in which a fixing device in an irradiation hole is fastened is proposed in which a conventional rod tip is not required.

In addition, the lower end capsule assembly for a long term irradiation test using the irradiation hole according to the present invention remarkably reduces the possibility of fatigue failure due to fluid induced vibration due to a rapid flow velocity in the irradiation hole during the long term irradiation test.

In addition, according to the present invention, the lower end capsule assembly for a long term irradiation test using the irradiation hole enables the cooling water to be supplied to the inside and / or outside of the capsule upper end assembly according to the purpose of the irradiation test.

1 is an exploded perspective view of a capsule lower end assembly for a long term irradiation test using an irradiation hole according to a first embodiment of the present invention.
Figure 2 is an assembled perspective view of the capsule lower end assembly shown in Figure 1;
3 is an AA cross-sectional view of the capsule lower end assembly shown in FIG.
Fig. 4 is a perspective view of a fixing device installed at the lower end of the irradiation head of the study. Fig.
FIG. 5 is a cross-sectional view illustrating a coupling method of the lock mechanism shown in FIGS. 1 to 3 and the lock device shown in FIG.
6 is an exploded perspective view of a capsule lower end assembly for a long term irradiation test using an irradiation hole according to a second embodiment of the present invention.
Figure 7 is an assembled perspective view of the capsule lower end assembly shown in Figure 6;
8 is a BB sectional view of the capsule lower end assembly shown in FIG.
FIG. 9 is an exploded perspective view of a capsule lower end assembly for a long term irradiation test using an irradiation hole according to a third embodiment of the present invention. FIG.
10 is an assembled perspective view of the capsule lower end assembly shown in FIG.
11 is a CC sectional view of the capsule lower end assembly shown in FIG.

The accompanying drawings in the present invention may be exaggerated for clarity, clarity, and descriptive convenience. In addition, since the following terms are defined in consideration of the functions of the present invention, they may vary depending on the intention or custom of the user or the operator, and therefore the definition of these terms should be based on the technical contents throughout this specification will be. On the contrary, the embodiments are merely illustrative of the constituent elements set forth in the claims of the present invention and do not limit the scope of the present invention, and the scope of the rights should be interpreted on the basis of technical ideas throughout the specification of the present invention .

1st Example

FIG. 1 is an exploded perspective view of a capsule lower end assembly for a long term irradiation test using an irradiation hole according to a first embodiment of the present invention, FIG. 2 is an assembled perspective view of the capsule lower end assembly shown in FIG. 1, 4 is a perspective view of a fixation device installed at the lower end of the irradiation field of the study, Fig. 5 is a perspective view of the capsule lower end shown in Figs. 1 to 3 and the fixation device shown in Fig. 4, Sectional view showing a coupling method of the apparatus.

1 to 5, a capsule bottom end assembly 100 for a long term irradiation test using an irradiation hole according to a first embodiment of the present invention includes a head 110, a body 120, a washer 130, An elastic spring 140, a guide bushing 150, and a bushing 160.

The head 110 has a hollow cylindrical shape in which a seating groove 111 is formed in which a capsule upper end assembly 400 for a long term irradiation test using an irradiation hole in a study is seated and supported.

The head 110 forms a flow path for transferring the cooling water flowing from the lower side of the irradiation hole through the hollow portion to the inside of the capsule upper end assembly 400 along the direction of the arrow in FIG.

The body portion 120 is formed in a hollow cylindrical shape so as to extend from the lower portion of the head portion 110 to have a smaller outer diameter than the head portion 110 and to form a passage through which the cooling water flowing from the lower side of the irradiation hole passes.

The body 120 has a locking groove 121 formed therein at a lower portion thereof to receive and accommodate a fixing device 500 installed at a lower end of the irradiation hole.

4, the fixing device 500 preferably has a rough bar shape and is preferably installed at the lower end of the irradiation hole.

The center portion of the fixing device 500 protrudes from a portion where the lower end of the conventional rod tip and the body stop are integrally inserted and press-fitted so as to be rotated so that the wing portion is attached to one side of the back face. The capsule bottom end assembly according to the embodiment of the present invention does not require such a processing step and thus can reduce manufacturing costs and has an advantage that a manufactured product can be used.

In addition, as shown in FIG. 4, the examination hole of the study is provided with a hexagonal flow pipe 600, and a tapered inner side surface 601 for guiding the capsule lower end assembly according to the embodiment of the present invention at its lower end . However, it is assumed that the irradiation holes in the study are not limited to the hexagonal flow pipe 600, but may be formed in various shapes.

The locking groove 121 includes a pair of first grooves 121a symmetrically provided to receive both ends of the fixing device 500 when the body 120 is pressed downward, Symmetrically formed in the first groove 121a so that both ends of the fixing device 500 can be moved along the upper inner side surface thereof, The body 120 is upwardly bent so that both ends of the fixing device 500 are accommodated in the second groove 121b when the pressing force applied to the body 120 is downwardly released And a pair of third grooves 121c symmetrically provided.

In this case, the first groove 121a is formed in a vertical direction, the second groove 121b extends horizontally in the first groove 121a, the third groove 121c is formed in the second groove 121b, It is preferable to extend the lower side in the vertical direction.

In this case, since the fluid induced vibration in the irradiation hole communicated to the inner wall of the lock groove 121 is dispersed throughout the body portion 120 having an inner diameter similar to that of the capsule upper end assembly, .

The washer 130 is fitted to the outer circumferential surface of the body portion 120 and is installed adjacent to the bottom surface of the toe 110.

In this case, the washer 130 is preferably interposed between the head 110 and the bushing 160 with a predetermined clearance space. That is, as described later, when the body portion 130 is rotated to draw the fixing device 500 into the lock groove 130 or the fixing device 500 is inserted into the lock groove 130, The washer 130 rotates together with the guide bushing 150 and the resilient spring 140 while rotating in the clearance space and rotates together with the bottom surface of the guide bushing 150 and the fixing device 500, The elastic force applied to the elastic spring 140 is minimized.

For example, the washer 130 is provided with a first end groove 131 at a lower portion of the outer circumference thereof and a second end groove 161 at an upper portion of the inner circumference of the bushing 160 And the bottom surface of the second end groove 161 is in contact with the ceiling face of the first end groove 131 and the bushing 160 supports the washer 130, The side wall and the upper portion of the outer circumference of the washer 130 may be spaced apart from each other by a predetermined distance to form a clearance space.

In this case, in order to easily attach the elastic spring 140 to the bottom surface of the washer 130, it is preferable that the height of the inner side wall of the first step groove 131 is larger than the height of the inner lower surface of the bushing 160 Do.

The elastic spring 140 is fitted to the outer circumferential surface of the body portion 120 and is fixed to the bottom surface of the washer 130 downward.

The elastic spring 140 serves to elastically support the load of the capsule assembly and can be fixed to the washer 130 by welding.

When the locking groove 130 and the fixing device 500 are engaged with each other, the elastic spring 140 is contracted by a reaction force generated by the pressing of the bottom surface of the guide bushing 150 against the fixing device 500 When the user releases the pressing force, the body portion 120 is relatively raised by the restoring force so that the locking groove 130 and the fixing device 500 are coupled.

The guide bushing 150 is fitted to the outer circumferential surface of the body 120 and is fixed to the elastic spring 140 to support the elastic spring 140.

In addition, the guide bushing 150 is preferably provided with an inclined surface 152b, which is slidably moved around the inner side surface 601 of the lower end of the irradiation hole.

For example, it is preferable that the guide bushing 150 includes a hollow cylindrical body 151 and a flange 152 provided along the periphery of the outer circumferential surface of the body 151.

At this time, it is preferable that the flange portion 152 is formed with a spring receiving groove 152a on which an elastic spring 140 is received and seated.

Further, it is preferable that the flange portion 152 is formed to be gradually thinner in the downward direction and has the inclined surface 152b.

Meanwhile, the guide bushing 150 may be fixed to the elastic spring 140 by a welding method.

The bushing 160 includes a bushing that supports the washer 130 and is fixed to the head 110 so that the washer 130 is adjacent to the bottom of the head 110.

In this case, as described above, the bushing 160 is provided with the second end groove 161 at the upper portion of the inner circumferential surface thereof along the circumference thereof, so that the top surface of the first end groove 131 and the end surface of the second end groove 161 The inner surface of the second step groove 161 and the upper surface of the outer peripheral surface of the washer 130 are spaced apart from each other by a predetermined distance so as to form a clearance space while the bottom surface is in contact with the bushing 160 to support the washer 130. [ can do.

In order to easily attach the elastic spring 140 to the bottom surface of the washer 130 as described above, the height of the inner wall of the first step groove 131 is set to be larger than the height of the inner peripheral surface of the bushing 160 .

In addition, the bushing 160 may be fixed to the head 110 by welding.

Referring to FIG. 5, a description will be made of a coupling method of the lock groove 121 and the fixing device 500. A user can use a capsule assembly (a capsule upper end assembly and a capsule lower end assembly 100) for a long term irradiation test using an irradiation hole, And then both ends of the fixing device 500a are drawn into the first groove 121a through the rotation of the fixing device 500 in the left and right directions.

In this case, the guide bushing 150 serves to correct the mounting position of the capsule lower end assembly 100 while sliding the slope 152b along the inner side surface 601 of the irradiation hole, And collides with the fixing device 500 to contract the elastic spring 150 through the reaction force.

In addition, the guide bushing 150, the resilient spring 140, and the washer 130 are idle while integrally fixed to each other, and in spite of friction between the bottom surface of the guide bushing 150 and the fixing device 500, Thereby minimizing the deformation force exerted on the spring 140.

When the fixing device 500b reaches the upper wall of the second groove 121b by the continued press-fitting of the user, the user simultaneously applies the pressing force and the rotational force so that the fixing device 500c is moved in the upper portion of the second groove 121b And moves to the opposite inner side wall.

In this case, the guide bushing 150, the resilient spring 140, and the washer 130 are integrally fixedly coupled to each other while being idle while being in contact with the bottom surface of the guide bushing 150 and the fixing device 500, Thereby minimizing the deformation force applied to the spring 140.

The user completes the engagement between the lock groove 121 and the fixing device 500 while simultaneously releasing the pressing force and the rotational force. That is, when the pressing force and the rotational force are released, the body portion 120 is raised by the restoring force of the elastic spring 140, and the fixing device 500d is received in the third groove 121c to complete the coupling.

Second Example

FIG. 6 is an exploded perspective view of a capsule lower end assembly for a long term irradiation test using an irradiation hole according to a second embodiment of the present invention, FIG. 7 is an assembled perspective view of the capsule lower end assembly shown in FIG. 6, 7 is a BB sectional view of the capsule lower end assembly shown in FIG.

The capsule bottom end assembly 200 for a long term irradiation test using the irradiation hole according to the second embodiment of the present invention includes a head 210, a body 220, a washer 230, an elastic spring 240, (250), and a bushing (260).

Since this configuration is substantially the same as the configuration described in the first embodiment of the present invention, the description thereof will be omitted for the sake of simplicity of the present invention.

The mounting groove 211, the lock grooves 221, 221a, 221b and 221c, the first end groove 231, the body 251, the flange 252, the spring seat 251a, the inclined surface 252b, The configuration of the second stage trench 261, the capsule upper end assembly 400, the fixing device 500, the hexagonal flow pipe 600 and the inner surface 601 is substantially the same as the configuration described in the first embodiment, And a description thereof will be omitted for the sake of simplicity.

6 to 8, a capsule bottom end assembly 200 for a long term irradiation test using an irradiation hole according to a second embodiment of the present invention is configured such that, unlike the first embodiment, And a cooling water channel part 270 for transmitting the cooling water transferred from the cooling part 220 to the outside of the capsule upper part.

At this time, the cooling water passage portion 270 includes a first passage hole 271 formed in the inner peripheral surface of the head 210 and a second passage hole 271 formed in the outer peripheral surface of the toe 210 so as to communicate with the first passage hole 271. [ 272).

In this case, it is preferable that the first flow hole 271 is formed at a position higher than the second flow hole 272 so that the flow of the cooling water is maintained at the upper side.

8, the capsule bottom end assembly 200 according to the second embodiment of the present invention is configured such that the cooling water flowing from the lower side of the irradiation hole in the direction of the center arrow through the hollow portion of the head 210, And a flow path for transferring the cooling water flowing from the lower side of the irradiation hole in the direction of both arrows through the cooling water flow path portion 270 to the outside of the capsule upper end assembly 400 is formed at the same time.

In this case, it is preferable that five cooling water passage portions 270 are provided radially along the circumference of the head portion 110 when the irradiation hole of the research furnace is provided with the hexagonal flow pipe 600. In other words, as compared with the case where six cooling water flow path portions 270 are radially provided along the periphery of the head portion 110, the inner surface of the hexagonal flow pipe 600 and the outer peripheral surface of the capsule upper end assembly 400 It is experimentally confirmed that the flow of the cooling water formed in the space of the water tank is more smooth.

Third Example

FIG. 9 is an exploded perspective view of a capsule lower end assembly for a long term irradiation test using an irradiation hole according to a third embodiment of the present invention, FIG. 10 is an assembled perspective view of the capsule lower end assembly shown in FIG. 9, 10 is a CC sectional view of the capsule bottom assembly shown in Fig.

The capsule bottom end assembly 300 for a long term irradiation test using the irradiation hole according to the third embodiment of the present invention includes a head 310, a body 320, a washer 330, an elastic spring 340, (350), and a bushing (360).

Since this configuration is substantially the same as the configuration described in the first and second embodiments of the present invention, the description thereof will be omitted for the sake of simplicity of the present invention.

The first recess 331, the body 351, the flange 352, the spring seat 351a, the inclined surface 352b, the second recess 351b, the first recess 361a, the first recess 361b, The configuration of the second stage trench 361, the capsule upper end assembly 400, the fixing device 500, the hexagonal flow pipe 600, and the inner surface 601 is substantially the same as the configuration described in the first and second embodiments The description thereof will be omitted for the sake of simplicity of explanation of the present invention.

In addition, since the structure of the cooling water channel portion 370, the first flow hole 371, and the second flow hole 372 is substantially the same as the structure described in the second embodiment, The description will be omitted.

9 to 11, a capsule bottom end assembly 300 for a long term irradiation test using an irradiation hole according to a third embodiment of the present invention is different from the capsule endoscope 300 according to the second embodiment in that a head 310, The cooling water that is extended from the center of the head 310 along the inner peripheral surface of the inner side of the head 310 on the upper side of the first flow hole 371 and the cooling water delivered from the body 320 is transmitted to the inside of the capsule upper end assembly 400 A cooling water flow blocking portion 380 for blocking the flow path may be further provided.

11, the capsule bottom end assembly 300 according to the third embodiment of the present invention is configured to inject the cooling water flowing from the lower side of the irradiation hole in the direction of both arrows through the hollow portion of the head 310, Only the flow path for transmitting the fluid to the outside of the upper end assembly 400 is formed.

As described above, according to the present invention, the lower end capsule assembly for a long term irradiation test using the irradiation hole shows a structure in which a conventional rod tip is unnecessary, and in the long term irradiation test, according to the fluid induced vibration Significantly reduces the likelihood of fatigue failure and allows cooling water to be supplied to the inside and / or outside of the capsule top assembly for purposes of the irradiation test.

As described above, the present invention has been described with reference to the embodiments shown in the drawings. However, it should be understood that the present invention is by way of example only and that various modifications and equivalent embodiments are possible on the basis of common knowledge in the art . Therefore, the true technical protection scope of the present invention should be determined based on the specific contents of the above-mentioned invention in accordance with the claims to be described below.

The present invention relates to a capsule bottom assembly for a long term irradiation test using an irradiation hole in a research field and is applicable to industrial fields related to design, maintenance and maintenance of a reactor.

100, 200, 300: Capsule bottom assembly
110, 210, 310: Tofu
111, 211, 311:
120, 220, 320:
121, 221, 321: Locking groove
130, 230, 330: Washers
131, 231, 331: first end groove
140, 240, 340: elastic spring
150, 250, 350: Guide bushing
151, 251, 351: Body
152, 252, 352: flange
152a, 252a, 352a: spring seat groove
152b, 252b, and 352b:
160, 260, 360: Bushing
161, 261, 361: second stage clip
270, 370: cooling water flow path portion
271 and 371:
272, 372:
380: cooling water flow passage blocking portion
400: Capsule upper assembly
500: Fixing device
600: Hexagonal flow tube
601: My side

Claims (19)

A head having a hollow cylindrical shape in which a seating groove is formed in which a capsule upper end assembly for a long term irradiation test using an irradiation hole is seated and supported;
A locking groove is formed in the lower portion of the head portion so as to extend in a structure having an outer diameter smaller than that of the head portion and is fitted in and fixed to a lower end of the irradiation hole, A body portion having a hollow cylindrical shape to be formed;
A washer which is fitted to an outer circumferential surface of the body and is installed adjacent to a bottom surface of the toe;
An elastic spring fitted to an outer circumferential surface of the body portion and fixed to the washer at a lower side thereof;
A guide bushing fitted to an outer circumferential surface of the body part and fixed to the elastic spring to support the elastic spring and having an inclined surface slidable on an inner surface of a lower end of the irradiation hole; And
A bushing supporting the washer so that the washer is installed adjacent to a bottom surface of the head and fixed to the head;
A capsule bottom assembly for a long term test using an irradiation ball.
[2] The apparatus according to claim 1,
Wherein at least one cooling water channel for delivering the cooling water transferred from the body part to an outer side of the capsule upper end is provided.
The cooling device according to claim 2,
And a second flow path formed on an outer circumferential surface of the tofu so as to communicate with the first flow path. The capsule bottom end assembly for a long term irradiation test according to claim 1, wherein the first flow path is formed on an inner circumferential surface of the head.
4. The apparatus according to claim 3,
A cooling water flow cutoff portion extending from the center of the head portion along the inner circumferential surface of the inner surface of the head portion on the first flow path hole to block the flow path of the cooling water delivered from the body portion to the inside of the capsule upper end assembly Wherein the capsule bottom lower end assembly for a long term irradiation test using an irradiation hole is provided.
The method according to claim 3 or 4,
Wherein the first flow hole is formed at a position higher than the second flow hole. The capsule bottom end assembly for a long term irradiation test using an irradiation hole.
The cooling device according to claim 3 or 4,
Wherein when the irradiation hole is formed as a hexagonal flow tube, five radial holes are provided along the circumference of the head portion. The capsule bottom end assembly for a long term irradiation test using the irradiation hole.
2. The apparatus according to claim 1,
Wherein the lower end of the capsule is formed in a bar shape and is provided at the lower end of the irradiation hole.
8. The locking device according to claim 7,
A pair of first grooves symmetrically provided to receive both ends of the fixing device when the body is pressed downward and a pair of first grooves provided symmetrically to receive both ends of the fixing device when the body is pressed downward, A pair of second grooves formed to extend symmetrically with respect to the first groove so as to be able to move along the side surface of the body, And a pair of third grooves formed to extend in the second groove so as to accommodate both ends of the apparatus and symmetrically provided to each other.
9. The method of claim 8,
Wherein the first groove is formed in a vertical direction, the second groove is formed to extend in a horizontal direction in the first groove, and the third groove is formed to extend in a downward vertical direction in the second groove. A lower end assembly of a capsule for a long term irradiation test using an irradiation hole.
The apparatus according to claim 1,
Wherein the bushing has a predetermined clearance space between the head and the bushing, and is interposed between the head and the bushing.
The method according to claim 1,
The washer is provided with a first step groove along its circumference at the lower part of its outer circumference. The bushing has a second step groove along the circumference at the upper part of the inner circumference thereof, and the top face of the first step groove and the second step groove And the bushing supports the washer. The bottom end assembly of a capsule for a long term irradiation test using an irradiation hole.
12. The method of claim 11,
Wherein an inner wall of the second end groove and an upper portion of an outer circumferential surface of the washer are spaced apart from each other by a predetermined distance.
12. The method of claim 11,
Wherein a height of the inner wall of the first step groove is larger than a height of a lower portion of the inner circumferential surface of the bushing.
2. The spring according to claim 1,
Wherein the washer is fixed to the washer by a welding method, and the lower end assembly of the capsule for a long term irradiation test is used.
2. The apparatus as claimed in claim 1,
Wherein the body has a hollow cylindrical body and a flange portion provided along the periphery of the body at a lower portion of the outer circumferential surface of the body, wherein the capsule bottom end assembly for a long term irradiation test is used.
16. The apparatus of claim 15,
And a spring receiving groove on which the elastic spring is received and seated is formed on an upper surface of the capsule bottom end assembly.
16. The apparatus of claim 15,
And the inclined surface is configured to be gradually thinned downward. The capsule lower end assembly for a long term irradiation test using an irradiation hole.
2. The apparatus as claimed in claim 1,
Wherein the elastic spring is fixed by welding to the lower end assembly of the capsule for a long term irradiation test.
The bushing of claim 1,
Wherein the cap is fixed to the head part by a welding method.

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