JPH08105987A - Intermediate heat exchanger device for fast reactor - Google Patents

Abstract

PURPOSE: To restrain a liquid level fluctuation or rippling in an intermediate heat exchanger vessel, prevent the entrainment of cover gases and reduce thermal stress. CONSTITUTION: A division 9 is horizontally laid in an intermediate heat exchanger vessel 7, and an intermediate heat exchanger 8 is erected on the division 9. A flow shroud 14 is provided, so as to enclose the upper section of the intermediate heat exchanger 8 and a barrel 31 is suspended from a cover 12, so as to surround the outer side of the shroud 14. Also, the lower end of the barrel 31 is fitted with a plate 32 directed outside, and a cylinder 33 is erected on the center of the plate 32. In addition, hot leg piping 6 is inserted in the cylinder 33 through the cover 12. The lower side of the division 9 forms a low temperature plenum 10. Furthermore, secondary sodium piping 17 is connected to the upper end of the intermediate heat exchanger 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loop type intermediate heat exchanger device for a fast reactor in which fluctuations and ripples of a coolant in an intermediate heat exchanger container are controlled to prevent gas entrainment.

[0002]

2. Description of the Related Art As shown in FIG. 8, a loop type fast reactor comprises a reactor vessel 1 containing a core 4 and a core upper structure 26,
An intermediate heat exchanger container 7 containing an intermediate heat exchanger 8 into which the liquid metal sodium 2 from the reactor container 1 flows,
It is composed of a pump container 21 provided between the intermediate heat exchanger container 7 and the reactor container 1 and containing a pump 22. Each of the containers 1, 21 and 7 is an inverted U-shaped hot-leg pipe 6, They are connected by a cold leg pipe 24 and a middle leg pipe 11.

Liquid metal sodium 2 is used as a coolant for the fast reactor, and the core 4 in the reactor vessel 1 is cooled by the low temperature sodium 2b sent by the pump 22 in the pump vessel 21 to form a core. The sodium 2a that has become hot after cooling 4 flows through the hot leg pipe 6, flows into the intermediate heat exchanger container 7 and exchanges heat with the secondary system sodium in the intermediate heat exchanger 8, and then the middle leg pipe 11 Flows into the pump container 21 and is sent again to the core 4 in the reactor container 1 via the pump 22.

A reactor core 1 contains a liquid metal sodium 2 as a coolant and a cover gas 3, and a reactor core 4 is arranged therein. The reactor vessel 1 is inverted U from the upper core plenum 5.
It is connected to the intermediate heat exchanger container 7 by a hot-leg pipe 6 of a letter tube.

The intermediate heat exchanger container 7 has a low temperature plenum 10 partitioned by a partition wall 9, and is connected from the low temperature plenum 10 to a pump container 21 by an inverted U-shaped middle leg pipe 11. The pump container 21 is an inverted U-shaped cold leg pipe 24
It is configured to return to the lower core plenum 25 in the reactor vessel 1 via the.

The coolant flow in such a fast reactor is
The low temperature sodium 2b sent from the pump vessel 21 to the lower core plenum 25 in the reactor vessel 1 via the cold leg pipe 24 cools the core 4. The sodium 2a that has become hot due to cooling of the core 4 flows from the core upper plenum to the hot leg piping 6 through the flow paths shown by the arrows in FIGS. 9 to 11.
Through the intermediate heat exchanger container 7 through the intermediate heat exchanger 8
Be led to.

The high temperature sodium 2a flowing into the intermediate heat exchanger 8 exchanges heat with secondary sodium through a large number of heat transfer tubes (not shown) to become low temperature sodium 2b. This low-temperature sodium 2b flows from the low-temperature plenum 10 into the pump container 21 via the middle leg pipe 11 by the pump 22, and is fed into the reactor container 1 again via the cold leg pipe 24. In this way, the heat of the core 4 is reduced to 2 by the intermediate heat exchanger 8.
It is transmitted to the next sodium.

Next, the flow of the liquid sodium sodium 2 as a coolant in the intermediate heat exchanger container 7 will be described with reference to FIGS. 9 and 10. 9A and 9B show the intermediate heat exchanger container 7 in FIG. 8, and FIG. 9A is a perspective view showing from the upper surface of the partition wall 9 shown in FIG. 8 to the lower surface portion of the lid 12, Figure 9 (b)
FIG. 9 is a transverse sectional view of FIG. The hot sodium 2a flowing into the upper part of the partition wall 9 of the intermediate heat exchanger container 7 from the hot leg pipe (inflow pipe) 6 flows through the gap between the flow shroud 14 and the intermediate heat exchanger 8 as shown in FIGS. 10 to 11. It flows into the intermediate heat exchanger 8 through the window 13.

After the heat exchange with the low temperature secondary sodium flowing from the secondary sodium pipe 17 inside the intermediate heat exchanger 8, the low temperature sodium 2b which has become low temperature is the intermediate heat exchanger 8
From the bottom of the low temperature plenum 10
Follow the flow path system from 10 to the pump container 21.

The liquid metal sodium 2 flowing out from the hot leg pipe 6 collides with the upper surface of the partition wall 9 as is clear from FIG. 9 (a), and then flows roughly along the intermediate heat exchanger 8 on the upper surface of the partition wall 9. The flow f1 that suddenly rises and becomes an upward flow toward the liquid level, passes through the narrow gap between the cold trap 20 or the middle leg pipe 11 and the wall surface of the intermediate heat exchanger container 7 while rising at a high flow rate and reaches the liquid level. Flow f2.

Both of them form a flow of opposing horizontal components near the liquid surface and collide with each other to form a downward flow f3. While forming such a complicated flow, the liquid metal sodium 2 flows into the gap between the flow shroud 14 and the intermediate heat exchanger 8.

The flow condition as described above causes the fluctuation of the liquid surface. As shown in FIG. 10, the flows of the opposing horizontal components disturb the liquid surface and easily form vortices at the time of the collision (or even at the collision with the stagnation), and are formed when the downward flow f3 occurs. There is a risk that gas will be easily entrained from the vortex.

At the same time, the flow f2 passing through the narrow gap between the cold lap 20 or the middle leg pipe 11 and the wall surface 21 of the intermediate heat exchanger container appears as a jet flow on the liquid surface, which makes it easy to get entangled. Gas entrapment is likely to occur.

The gas entrained in the intermediate heat exchanger 8 circulates through the pump vessel 21 to the reactor vessel 1 and is carried to the reactor core 4 by the lower core plenum 25. When the gas enters the core 4, the liquid metal sodium 2 which is also a neutron moderator at the same time as the coolant is locally eliminated only in the gas portion, so that the reactivity of the reactor changes.

Generally, the core 4 of a fast reactor has a property that the reaction becomes violent when a void such as a gas is generated in the coolant. In that case, the reactor must be stopped and the operation must be interrupted. I have no choice. Furthermore, if conditions such as a large amount of gas intrusion are present, or if the reactor is not shut down, there is a possibility that it will develop into a runaway reactor, which poses a safety issue for the reactor. .

[0016]

Therefore, in order to prevent the gas from being trapped in the intermediate heat exchanger container 7, it is possible to prevent the gas from being trapped below the liquid level 15 during operation as shown in FIG. It is considered to install a board. In this case, gas entrainment from the liquid surface can be prevented, but the temperature difference between the top and bottom of the plate remains long when stopped, and the axial direction of the intermediate heat exchanger container, flow shroud, cold wrap, etc. The temperature difference may cause thermal stress, which may impair the structural integrity of the device.

This phenomenon will be described in more detail. First, during operation, the temperature of the upper surface portion is almost equal to that of the high temperature sodium 2a due to heat conduction due to the partition wall 9. When the reactor is shut down, the output of the pump is first reduced to reduce the flow rate.

This is because the decay heat from the fuel is not completely released even when the reactor is shut down, and it is necessary to flow a coolant for removing the decay heat. The system temperature is lowered for maintenance and so on.

When the output of the pump is reduced and the flow rate of the coolant is reduced, the pressure loss of the system is reduced. Therefore, first, the liquid level in the intermediate heat exchanger container 7 rises. After that, the liquid metal sodium 2 cooled in the intermediate heat exchanger 8 passes through the core 4 of the nuclear reactor 1 and returns again into the intermediate heat exchanger container 7.

At this time, since the liquid metal sodium 2 has a small heat generation in the core, it returns as low temperature sodium 2b. Therefore, the high temperature sodium in the upper portion of the partition wall 9 of the intermediate heat exchanger container 7 gradually becomes lower in temperature from the lower side.

By the way, as shown in FIG. 11, when a plate 32 for partitioning in the horizontal direction is provided in the intermediate heat exchanger container 7, the low temperature sodium flowing in from the hot leg pipe 6 interferes with the plate 32. Since it is difficult to mix with sodium on the upper surface of 32, the flow shroud does not mix on the upper surface of plate 32.
It enters the inflow window 13 from between 14 and the intermediate heat exchanger 8, passes through the intermediate heat exchanger 8, the lower temperature plenum 10, and the middle leg pipe 11 and flows out to the pump container 21. In addition, the code in the figure
15 indicates the liquid level during operation, and 16 indicates the liquid level during stop.

Therefore, the plate is removed until it is removed by heat conduction.
The upper part of 32 becomes hot and the lower part becomes cold. According to such a temperature distribution of the cooling liquid metal sodium, a steep temperature gradient is formed in the axial direction in the upper and lower portions of the plate 32 of the intermediate heat exchanger container 7 and the like, which causes a large thermal stress. become.

However, in the case where holes are simply formed in the plate 32 as a countermeasure against this, if the holes are small, the pressure loss there is large, and the force for advancing the upper and lower coolants does not work, so that the mixing is not promoted. .

Further, when the holes are formed large, the mixing of the upper and lower sides of the plate 32 at the time of stop is promoted, but the upward flow of the coolant during operation affects the liquid level through the holes, and for the original purpose. There is a problem that the effect of controlling the fluctuation of a certain liquid surface and preventing the entrainment of gas cannot be exhibited.

The present invention has been made in order to solve the above problems, and controls the above-mentioned flow condition, suppresses the liquid level fluctuation and ripple in the intermediate heat exchanger container, and prevents the entrainment of the cover gas. At the same time, by reducing the thermal stress generated by the structure that prevents gas entrapment, it is possible to prevent abnormal reactivity in the core and reduce the thermal stress that occurs in the intermediate heat exchanger container that is in contact with the sodium liquid surface. The object of the present invention is to provide a highly reliable intermediate heat exchanger device for a loop type fast reactor which is compatible with the integrity of the core and structural materials.

[0026]

According to the present invention, a container containing liquid metal heated in a nuclear reactor, a lid of the container, an inflow pipe for inflowing the liquid metal from the reactor, and an outflow of the liquid metal are provided. Outflow piping, an intermediate heat exchanger for exchanging heat between the liquid metal in the container and an external liquid metal, a device arranged to penetrate the liquid metal liquid surface other than the intermediate heat exchanger, and A cylinder that surrounds the intermediate heat exchanger and is hung from the lid and has a hole above the liquid metal liquid level during normal operation and below the liquid metal liquid level during stoppage, and below the cylinder in the liquid metal. A plate installed in the horizontal direction through which the liquid metal inflow pipe, the outflow pipe, the intermediate heat exchanger and other liquid level penetrating devices penetrate, and the pipe and the device penetrating portion of the plate to enclose the pipe and the devices in operation. Inside, the upper part projects above the liquid metal, When is characterized by comprising a cylindrical body mounted to the upper portion enters the liquid metal during.

Further, the present invention is characterized by having holes in both of the cylinder or the cylinder or above the liquid metal level during normal operation and below the liquid metal sodium level during stoppage. The invention is characterized in that, instead of the cylindrical body, the plate has a communication hole through which upper and lower coolants communicate with each other. Furthermore, the hole provided in the body or the cylinder is characterized by arranging holes of different sizes in the axial direction, and a non-perforated or porous vertical plate is attached to the upper surface of the plate. To do.

[0028]

According to the present invention, during the operation of the reactor, the plate installed in the liquid metal sodium suppresses the fluctuation of the liquid surface due to the high temperature sodium flowing from the inflow pipe. Also, due to the cylinder and the cylinder standing upright from the penetrating part of the plate, the pressure loss becomes large in the annular gap between the intermediate heat exchanger and the cylinder and the annular gap between the pipe and the device and the cylinder, so that the cover gas from the liquid surface Is suppressed.

On the other hand, when the reactor is shut down, low temperature sodium flows in from the inflow pipe, passes through the inside of the flow shroud installed on the outer periphery of the upper part of the intermediate heat exchanger, and flows into the intermediate heat exchanger from the inflow window. Therefore, the outer surface of the intermediate heat exchanger, that is, the outer surface of the flow shroud becomes cool, and the sodium in the annular gap between the outer surface of the flow shroud and the shell is cooled.

Since the cooled sodium has a large specific gravity, it flows downward. At this time, since the upper part of the cylinder is connected to the upper part of the plate, hot sodium flows in from the outside of the cylinder at the upper part of the plate, and the hot sodium is cooled again.

On the other hand, when the hot sodium at the upper part of the plate flows into the inside of the case, sodium flows into the upper part of the plate through the gap between the tubular body and the pipes and equipment. That is, due to the natural circulation flow driven by cooling in the flow shroud,
The sodium at the top of the plate is drained from between the shell and the intermediate heat exchanger and exchanged with the sodium at the bottom of the plate to promote mixing of the sodium above and below the plate.

Further, instead of the clearance between the cylindrical body and the piping and equipment, a similar natural circulation loop can be provided by providing the plate with a small hole with a large pressure loss that does not affect the liquid level fluctuation and gas entrainment. Can be configured. Furthermore, by installing a vertical plate on the upper part of the plate, it is possible to suppress the fluctuation of the liquid surface that occurs during an earthquake.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an intermediate heat exchanger device for a fast reactor according to the present invention will be described with reference to the drawings. FIG. 1 shows the invention of claim 1 as a first embodiment of the present invention, and is a longitudinal sectional view of an intermediate heat exchanger container 7.

In this embodiment, the intermediate heat exchanger container 7, the lid 12 of the intermediate heat exchanger container 7, and the hot leg pipe 6 into which liquid metal sodium flows from the reactor which penetrates the lid 12
An outflow pipe (not shown) for outflowing the liquid metal sodium, and an intermediate heat exchanger 8 for exchanging heat between the liquid metal sodium in the container 7 and the external liquid metal sodium.
In addition to the intermediate heat exchanger 8, a device arranged to penetrate through the liquid surface of the liquid metal sodium, and a liquid level of the liquid metal sodium during normal operation suspended from the lid 12 surrounding the intermediate heat exchanger 8. A cylinder 31 having a hole 34 above 15 and below the liquid level of liquid metal sodium at the time of stop, and a hot leg pipe 6, an outflow pipe, an intermediate heat exchanger 8 mounted in the liquid metal at a lower portion of the cylinder 31 and A plate 32 provided in the horizontal direction through which other liquid level penetrating equipment penetrates, and the pipe and equipment penetrating part of this plate 32 surround the piping and equipment, and the upper part projects above the upper surface of the liquid metal sodium during operation, and the upper part when stopped Is composed of a cylindrical body 33 mounted so as to enter the liquid metal.

Next, the operation of the first embodiment will be described. The hot sodium 2a flowing into the upper part of the partition wall 9 of the intermediate heat exchanger container 7 from the hot leg pipe (inflow pipe) 6 passes through the gap between the flow shroud 14 and the intermediate heat exchanger 8 and the inflow window.
It flows from 13 into the intermediate heat exchanger 8.

After heat exchange with the low temperature secondary sodium flowing from the secondary sodium pipe 17 inside the intermediate heat exchanger 8, the low temperature sodium 2b flows out from the lower portion of the intermediate heat exchanger 8 to the low temperature plenum 10. Then, the flow is discharged from here to the pump container 21 shown in FIG.

The sodium 2a flowing out from the hot leg pipe 6 collides with the upper surface of the partition wall 9 and then flows on the upper surface of the partition wall 9 along the intermediate heat exchanger 8 as it is and rises suddenly toward the liquid surface. And the cold trap 20 or middle leg pipe 11 shown in FIG. 9 and a narrow gap between the wall surface of the intermediate heat exchanger container 7 while passing through while rising at a high flow rate and reaching the liquid level, the flow is divided into both. Becomes a flow of opposing horizontal components near the lower surface of the plate 32 and collides with each other to form a downward flow. However, since there is no influence on the liquid surface, fluctuations in the liquid surface and gas entrainment are suppressed.

Further, due to the body 31 and the tubular body 33 which are erected from the penetrating portion of the plate 32, the body 31 is provided in the annular gap between the flow shroud 14 and the barrel 31 and the annular gap between the hot leg pipe 6 and the tubular body 33.
Further, since the pressure loss becomes larger than that in the case of the simple gap structure without the cylindrical body 33, the entrapment of the cover gas 3 from the liquid surface is suppressed.

On the other hand, when the reactor is stopped, low-temperature sodium flows from the inflow pipe 6 into the intermediate heat exchanger 8 through the inside of the flow shroud 14 installed at the outermost peripheral portion of the intermediate heat exchanger 8. Therefore, the outer surface of the intermediate heat exchanger 8, that is, the outer surface of the flow shroud 14 becomes cold, and the sodium in the annular gap between the flow shroud 14 and the outer shell 31 is cooled.

The cooled sodium has a large specific gravity and flows downward. At this time, the hole installed on the upper part of the body 31
Since 34 is below the liquid level and is connected to the upper part of the plate 32, high temperature sodium flows into the inside of the barrel 31 through the hole 34 and is cooled again. On the other hand, when the high temperature sodium in the upper part of the plate 32 flows into the inside of the case 31, the sodium flows into the upper part of the plate 32 from the gap between the tubular body 33 and the pipes and equipment.

That is, the sodium in the upper part of the plate 32 is caused to flow out between the shell 31 and the intermediate heat exchanger by the natural circulation flow driven by the cooling in the flow shroud 14 and is exchanged with the sodium in the lower part of the plate 32. This promotes the mixing of sodium in the plate 32.

As described above, it is possible to prevent the fluctuation of the liquid surface and the entrainment of gas at the time of operation, and to reduce the temperature difference between the upper and lower sides of the liquid sodium at the time of stop to reduce the thermal stress generated in the equipment.

Next, as a second embodiment, the invention of claim 2 will be described with reference to FIG. In the first embodiment, the plate 32 is covered with the lid 12.
Although the suspension support structure is connected from the lower surface of the body via the body 31, the second embodiment uses the rod 36 to connect the lid 12 and the plate 32 with the rod 36 and the body 31 and the cylinder. The structure is designed to support the body 33, and the other structure is the same as that of the first embodiment.

According to this embodiment, similarly to the cylinder 33, the body 31 may have a structure in which the upper part projects to the upper surface of the liquid metal during operation and the upper part enters the liquid metal sodium when stopped. The operation and effect of this embodiment are almost the same as those of the first embodiment, but since the plate 32 can be supported at a number of points, it is possible to improve the vertical rigidity of the plate 32. Is.

Next, the invention of claim 3 will be described with reference to FIG. 3 as a third embodiment. In this embodiment, the upper ends of the body 31 and the cylinder 33 in the second embodiment are made to project above the liquid metal liquid level even when stopped, and instead, the liquid level when stopped is above the liquid level 15 during operation. The hole 34 is provided below.

The operation and effect of this embodiment are similar to those of the second embodiment, but have the feature that the flow rate can be easily controlled by the holes 34. Further, in the case of providing the hole 34 in the body 31 and in the case of providing the hole 34 in the cylindrical body 33, it is possible to use them in combination.

Next, the invention of claim 5 will be described with reference to FIG. 4 as a fourth embodiment. In this embodiment, the cylindrical body 33 in the first embodiment is removed, and a plurality of communication holes 35 are provided in the plate 32 as a sodium flow path from below the plate 32 to above. This communication hole 35 is set so that the pressure loss is sufficiently large with respect to the upward flow of the intermediate heat exchanger container 7 during operation and the suction of sodium from the lower part of the flow shroud 14, thereby causing fluctuations in the liquid surface and gas. The area shall not cause the entrainment of

The operation is the same as that of the first embodiment except that the sodium inflow to the upper surface of the plate 32 at the time of stop is from the communication port 35. This embodiment is combined with the first embodiment having the hole 34 in the body 31, but a rod for supporting from the lid 12 is used.
The same applies to the combination with the second embodiment which has 36 and does not have the hole 34 in the body 31.

Next, as a fifth embodiment, as shown in FIG.
The invention of claim 6 will be described with reference to FIG. Note that FIG.
5A shows the overall configuration of this embodiment, and FIG.
It is an enlarged view of a small circle portion in (a).

In this embodiment, as shown in an enlarged view in FIG. 5B, the holes 34 of the body 31 in the first embodiment are replaced by a plurality of holes 34.
The areas a, 34b, and 34c are changed in the axial direction, and a plurality of them are arranged in the axial direction. The operation and effect of this embodiment are the same as those of the first embodiment, but a characteristic that enables more appropriate control of the natural circulation flow rate when the liquid level rise at the time of stop is gradual or stepwise is provided. Have.

This embodiment is a combination of the first embodiment, but the holes 34 and the cylindrical body 33 of the barrel of the other embodiments are combined.
The same applies to the combination with the holes 34 of FIG.

Next, a sixth embodiment of the invention will be described with reference to FIG. In this embodiment, as shown in FIG. 6, a steady rest 37 is provided on the inner surface of the intermediate heat exchanger container 7, and the steady rest 37 is fitted to the outer peripheral portion of a plate 32 provided horizontally. is there. The other parts are similar to those of the first embodiment shown in FIG.

According to this embodiment, the action and effect on the fluctuation of the liquid surface and the entrainment of gas are the same as those in the first embodiment, but the manufacturing tolerance of the intermediate heat exchanger container 7 and the outer peripheral portion of the plate 32 are different. The manufacturing tolerances can be made gentle, the manufacturing and assembling are easy, and the liquid level fluctuation is the same as that in the case where the intermediate heat exchanger container 7 and the plate 32 of the first embodiment are accurately assembled. ， It can exhibit the performance for preventing gas entrapment and the earthquake resistance. This embodiment is a combination with the first embodiment, but it can be implemented in a similar manner with a combination with other embodiments.

Next, as a seventh embodiment, as shown in FIG.
The inventions of claims 8 and 9 will be described with reference to (b). 7 (a) shows the present embodiment, and FIG. 7 (b) shows FIG.
(A) is a cross-sectional view taken along the line AA of FIG.

This embodiment is similar to the first embodiment shown in FIG.
As shown in (b), the vertical plate 38 is provided in the direction of the central axis of the intermediate heat exchanger container 7. According to the present embodiment,
By shaking the entire intermediate heat exchanger container 7 during an earthquake,
It is not the fluctuation of the liquid surface due to the inflow of sodium, but the suppression of the liquid surface due to the seismic force.

That is, when the entire intermediate heat exchanger container 7 containing liquid metal sodium is shaken, if the liquid surface of sodium is greatly shaken, the wave is broken and gas is entrained. At this time, if the vertical plate 38 is installed in the intermediate heat exchanger container 7, the vertical plate 38 becomes a resistance and the ripples are reduced. When the vertical plate 38 is installed in the intermediate heat exchanger container 7, the fluctuation of the liquid surface is suppressed even during an earthquake.

In the present embodiment, the number of the vertical plates 38 is one, but the effect is greater than the case of a large number, and by changing the direction, earthquakes in many directions can be dealt with. Also, this vertical plate
Since liquid metal sodium does not flow between the regions partitioned by 38, a temperature difference may occur in some cases, but this can be mitigated by forming the vertical plate 38 with a perforated plate.

The hole area when the vertical plate 38 is a perforated plate is
The area and shape are set so that the pressure loss is large for the fast flow velocity caused by the earthquake and small for the slow flow such as natural convection due to the temperature difference. This embodiment is a combination with the first embodiment, but the same applies to combinations with other embodiments.

[0059]

According to the present invention, fluctuations in liquid level and ripples in the intermediate heat exchanger container are suppressed to prevent entrapment of the cover gas, and at the same time, thermal stress caused by the structure for preventing entrapment of gas is eliminated. This reduces both the reactivity anomaly in the core and the thermal stress generated in the equipment inside the intermediate heat exchanger container that is in contact with the liquid surface of liquid metal sodium, thereby ensuring the integrity of the core and structural materials. And contribute to providing a highly reliable loop fast reactor.

[Brief description of drawings]

FIG. 1 is a first of the intermediate heat exchanger device for a fast reactor according to the present invention.
FIG. 6 is a vertical cross-sectional view showing the embodiment of FIG.

FIG. 2 is a second intermediate heat exchanger device for a fast reactor according to the present invention.
FIG. 6 is a vertical cross-sectional view showing the embodiment of FIG.

FIG. 3 is a third view of the intermediate heat exchanger device for a fast reactor according to the present invention.
FIG. 6 is a vertical cross-sectional view showing the embodiment of FIG.

FIG. 4 is a fourth example of the intermediate heat exchanger device for a fast reactor according to the present invention.
FIG. 6 is a vertical cross-sectional view showing the embodiment of FIG.

5 (a) is a vertical cross-sectional view showing a fifth embodiment of the intermediate heat exchanger device for a fast reactor according to the present invention in a side view, and FIG. 5 (b) is an enlarged cross-sectional view of a main part of (a).

FIG. 6 is a sixth intermediate heat exchanger device for a fast reactor according to the present invention.
FIG. 6 is a vertical cross-sectional view showing the embodiment of FIG.

FIG. 7A is a vertical cross-sectional view showing a partial side view of a seventh embodiment of the intermediate heat exchanger device for a fast reactor according to the present invention, and FIG. 7B is a cross-sectional view taken along the line AA of FIG. Fig.

FIG. 8 is a system diagram schematically showing an arrangement relationship of a conventional loop type fast reactor.

9 (a) is a perspective view showing the inside of the intermediate heat exchanger container in FIG. 8, and FIG. 9 (b) is a cross-sectional view of FIG. 9 (a).

FIG. 10 is a vertical cross-sectional view partially showing a side view of a conventional intermediate heat exchanger device for a fast reactor.

11 is a vertical cross-sectional view showing a part of the side surface for explaining the operation in FIG.

[Explanation of symbols]

1 ... Reactor vessel, 2 ... Liquid metal sodium, 2a ... High temperature sodium, 2b ... Low temperature sodium, 3 ... Cover gas,
4 ... Core, 5 ... Core upper plenum, 6 ... Hot leg piping (inflow piping), 7 ... Intermediate heat exchanger container, 8 ... Intermediate heat exchanger, 9 ... Partition wall, 10 ... Low temperature plenum, 11 ... Middle leg piping (outflow piping) ), 12 ... Lid, 13 ... Inflow window, 14 ... Flow shroud, 15 ... Liquid level during operation, 16 ... Liquid level during stop, 17 ... Secondary sodium piping, 20 ... Cold trap, 21 ... Pump container,
22 ... Pump, 24 ... Cold leg piping, 25 ... Lower core plenum, 26 ... Upper core structure, 31 ... Trunk, 32 ... Plate, 33 ... Cylindrical body,
34 ... hole, 35 ... communication hole, 36 ... rod, 37 ... steady rest, 38 ...
Vertical plate.

Front page continued (72) Inventor Hiroshi Hirayama 8 Shinsita-cho, Isogo-ku, Yokohama, Kanagawa Pref., Toshiba Corporation Yokohama office (72) Inventor Shigeki Maruyama 8 Shinsugita-cho, Isogo-ku, Yokohama, Kanagawa Pref. On-site (72) Inventor Toru Otsubo 1-1-1, Shibaura, Minato-ku, Tokyo Inside Toshiba Headquarters Office (72) Inventor Noriaki Hirata 1 Komukai Toshiba-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Incorporated Toshiba Research In the development center

Claims (9)

[Claims] 1. A container containing liquid metal heated in a nuclear reactor, a lid of the container, an inflow pipe for inflowing the liquid metal from the reactor, an outflow pipe for outflowing the liquid metal, and the inside of the container. An intermediate heat exchanger for exchanging heat between the liquid metal and the external liquid metal, a device arranged to penetrate the liquid metal liquid surface in addition to the intermediate heat exchanger, and surrounding the intermediate heat exchanger. A cylinder suspended from the lid and having a hole above the liquid metal level during normal operation and below the liquid metal level during stop, and the inflow of the liquid metal attached to the liquid metal at the bottom of this cylinder A horizontal plate through which pipes, outflow pipes, intermediate heat exchangers and other liquid level penetrating devices penetrate, and the pipes and device penetrating parts of this plate surround the pipes and devices and the upper part is the liquid metal upper surface during operation. To the top, and when stopped, the top is in the liquid metal. An intermediate heat exchanger device for a fast reactor, characterized by comprising a cylindrical body attached so as to enter. 2. A container for containing a liquid metal heated in a nuclear reactor, a lid of the container, an inflow pipe for inflowing the liquid metal from the reactor, an outflow pipe for outflowing the liquid metal, and the inside of the container. Intermediate heat exchanger for exchanging heat between the liquid metal and the external liquid metal, a device arranged to penetrate the liquid metal liquid surface other than the intermediate heat exchanger, and a rod supported from the lid. A plate provided in the lower part of the rod in the liquid metal and horizontally provided through which the liquid metal inflow pipe, the outflow pipe, the intermediate heat exchanger and other liquid level penetrating devices penetrate, and an intermediate heat exchange of the plate A cylinder attached to the penetrating part of the intermediate heat exchanger and surrounding the intermediate heat exchanger so that the upper part is above the liquid metal liquid level during normal operation and enters the liquid metal when stopped, and the pipe and equipment penetration of the plate Operate by enclosing piping and equipment in the section Inside, the upper part projects above the liquid metal,
An intermediate heat exchanger device for a fast reactor, characterized in that it comprises a cylindrical body mounted so that the upper part thereof enters the liquid metal when stopped. 3. The intermediate for a fast reactor according to claim 1 or 2, characterized in that the upper parts of the cylindrical body and the cylinder are projected to the upper part of the liquid metal even when the cylinder and the cylinder are stopped, and holes are provided in the cylindrical body and the cylinder. Heat exchanger equipment. 4. The liquid for normal operation such that the upper part of one of the body and the cylinder is above the liquid metal level during normal operation and enters the liquid metal when stopped, and the other is for liquid during normal operation. 3. The intermediate heat exchanger device for a fast reactor according to claim 2, wherein the intermediate heat exchanger device has a hole above the liquid metal level and below the liquid metal liquid level when stopped. 5. The plate according to claim 1, wherein the plate is not provided with the tubular body, and a plate attached to the liquid metal at a lower portion of the barrel has a communication hole for allowing the upper and lower liquid metals to communicate with each other. Intermediate heat exchanger device for fast reactors. 6. The intermediate heat exchanger device for a fast reactor according to claim 1, wherein the holes have different areas and are arranged in the axial direction. 7. The intermediate heat for a fast reactor according to claim 1, wherein the periphery of the plate is fitted with a container or a structure supported by the container or a structure supported by a lid. Exchanger device. 8. The intermediate heat exchanger device for a fast reactor according to claim 1, wherein a vertical plate is attached between the case and the vessel. 9. The intermediate heat exchanger device for a fast reactor according to claim 8, wherein the vertical plate is a porous plate.