JPS6273191A - Magneto hydrodynamic stop and liquid metal cooling tank typefast reactor using said stop - 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] [Field of Application of the Invention] The present invention is directed to a fluid stop that separates two fluids having a static pressure difference without any pressure between them.
draulic 1ock), and furthermore, a liquid that uses the fluid stop to separate high-temperature liquid metal in the reactor primary system from low-temperature liquid metal in the tank storing the primary system. It concerns metal cooled tank fast reactors.

[Background of the invention]

The operating rate of nuclear power generation using light water reactors has increased in recent years, and the proportion of nuclear power generation in total power generation has been increasing over the years. By the way, since the Three Mile Island accident in the United States, there has been a movement to dramatically improve the safety of nuclear reactors. As one of them, the PIUS has been proposed (Reference 1.2).
Rent Ultimate 5afety), and hereinafter, the Guias furnace will be referred to as an ultra-safe furnace.

In ultra-safe reactors, the entire primary system is housed in a high-pressure pool of water in order to prevent loss of coolant due to coolant pipe rupture, which is considered to have the highest probability of reactor core damage among light water reactor accidents. A method is adopted. The primary system and pool water are connected through a fluid stop without any physical partitions, and in the event of an accident, the pool water flows into the primary system through the fluid stop, so in any case, the core fuel will be removed from the coolant. It has a fail-safe configuration that prevents any exposure.

Figure i10 shows its configuration and static pressure distribution on the primary side and pool side. The ultra-safe reactor shown in Fig. 10 includes a container 10 for storing pool water, a reactor core 11, a primary system cooling water drive bomb f13,
Pressurizer 16. Lower fluid stop 14' and upper fluid stop 1
It consists of 5'.

The heat generated in the reactor core 11 is transferred to the
The cooling water on the next side is sent to the heat exchanger 12 and reaches the second side. Pool water consisting of low-temperature high-concentration boron water is connected to high-temperature primary cooling water and fluid stopper 14'.

15', they are separated and held during steady operation.

The lower fluid stop 14' in FIG. 10 consists of a group of tubes as shown in FIG. 11, in which the primary cooling water 18 and the pool water 19 are in direct contact with each other at the boundary surface 17 without a partition wall. . The upper fluid stop 15' has a similar configuration.

The right half of Figure 10 shows the static pressure distribution. In the figure, PO indicates the pressure inside the pressurizer 16, and the dashed line indicates the static pressure distribution when the primary high temperature water is stationary. The chain line indicates high temperature water.
The static pressure distribution is shown in a hypothetical case where the pressure is increased by '13 (pressure increase amount ΔPpump) and there is no pressure loss (ΔPrrictj.n) in the core. During steady operation, as shown in the figure, the static pressures of the low-temperature pool water (solid line) and the high-temperature primary cooling water (broken, 4) at the upper and lower fluid stops 14' and 15' are equal, and the pipe group consists of By guiding the high temperature water through the upper part and the lower part of the low temperature water during the fluid stop (10th
), a stable Q''C boundary surface 17 can be maintained.On the other hand, in the event of an accident in which the pressurizing steam supply piping to the pressurizer 16 or the secondary side piping of the heat exchanger is damaged, the upper and lower fluid stops 1
4′.

The pressure balance at the upper fluid stop 15' is disrupted, and high concentration boron water in the pool flows in from the fluid stop 14', shutting down the reactor 11 and dissipating the decay heat after the accident to the upper fluid stop 15'.
It is removed by natural circulation cooling, which takes the outflow path from the

For liquid metal cooled fast breeder reactors, which have been proposed as the next generation of nuclear reactors after light water reactors, so-called tank-type reactors have been developed for safety reasons as well (the liquid metal coolant in the tank is Functionally the same as pool water in an ultra-safe reactor). In tank-type fast reactors with a high core heat generation density (thermal power density), if the primary coolant drive source (pump, etc.) fails, a large natural circulation flow rate is required in the flow path through the core in the tank. becomes. Therefore, in addition to the heat exchange path with large flow resistance through which the primary coolant flows during steady operation, and the flow path through which the coolant flows through pumps, etc., there is a flow resistance that allows the coolant in the reactor to flow into the core through natural circulation. It is desirable to secure a small flow path.

Therefore, using the same concept as the ultra-safe reactor mentioned above as a light water reactor,
In a liquid metal cooled tank type fast reactor, it is conceivable to separate the primary coolant and the coolant in the tank during steady operation using the conventional fluid stop shown in FIGS. 10 and 11. However, as can be seen from the static pressure distribution in Fig. 10, in the conventional fluid stop, in order to maintain the liquid interface 17 during steady state, the pressure drop ΔPyriction in the core must be equal to the low temperature coolant in the pool. Static pressure difference (ρ) with the high temperature coolant in the next system.

-ρhIgh1. Here,
ρ. , ρh is the density of the cold coolant and hot coolant (subscript c, h stands for cold * hot), g is the gravitational acceleration, and hl is the height between the upper and lower fluid stops.

In the case of the light water ultra-safe reactor, the pressure drop ΔPyrl in the core
The above requirements are achievable because ctioyu is relatively small and the density difference (ρ.−ρh) between high temperature water and low temperature water is relatively large.

On the other hand, in a liquid metal cooled tank type fast reactor, the fuel pitch in the core is denser than that in a light water reactor, and the core flow velocity of the coolant is faster, so the core is overwhelmed by ΔPyrietl.
on is approximately 10 times larger than that of a light water reactor, and the difference in density between high-temperature and low-temperature coolants is smaller in a fast reactor. .-ρh) In order to increase the ghl, the pool height of the light water reactor should be 40 m in the ultra-safe reactor shown in Figure 10).
This would require a height more than 10 times that of the actual height, which would be practically impossible to realize.

In this way, it can be said that it is necessary to develop a new fluid stop mechanism in liquid metal cooled fast reactors in order to fully realize the tank-type reactor with an open primary system, which is desirable for natural circulation cooling in the event of an accident. Therefore, from the standpoint of achieving inherent safety, this fluid stopper is suitable for equipment without mechanically moving parts.
It is necessary to develop the device as a passive component (hereinafter referred to as a passive device).

Passive devices based on electromagnetic force have been developed using the high conductivity of liquid metals (Reference 3).

FIG. 12 shows an example of this, in which a magnetic brake is used to suppress or block the flow of liquid metal, and an annular flow path is made up of an annular magnet (hereinafter referred to as a magnet) 2 and a magnetic material 3.
When the liquid metal l flows in the direction of the arrow 0), a current j is induced as shown in FIG. The induced current interacts with the magnetic field of the magnet, and a force in the opposite direction to the flow acts on the liquid metal 1. As shown in Figure 2, if the length of the magnetic pole part in the flow direction is L, the magnetic field is completely uniform, and its strength is B, then the pressure increase ΔP in the fluid due to electromagnetic force is ΔP=σuB L (1) In equation (1), σ represents the electrical α conductivity of the liquid metal, and U represents the average flow velocity of the liquid metal.If ΔP is larger than the pressure increase of the liquid metal on the upstream side due to a pump, etc., the fluid flow will be However, the flow rate of this electromagnetic brake can be controlled by a control device such as changing the strength of the magnetic field or by manual operation, so the electromagnetic brake can be used as a flow rate controller as a fluid stop. When applied, there are aspects in which it cannot be considered a completely passive device.

FIG. 13 is a cross-sectional view showing an example of a device called an electromagnetic flow coupler that uses the flow energy of the liquid metal on the driving side to flow with the liquid metal on the driven side (Reference 3). In the annular space between the magnets 5.6, there are passages 7 and 8 that extend in the axial direction and are partitioned by a conductive partition wall 9, and the passages 7 and 8 communicate with each other. The flow path 7 is for the liquid metal on the driving side, and the flow path 8 is for the liquid metal on the driven side.

A flow path 7 is formed in the axial direction across the magnetic field generated between the magnets 5 and 6.
In the driving side liquid metal flowing therein, an induced current is generated in the direction of the arrow in FIG. 13, as in the case of an electromagnetic brake. Since the flow path 7 and the flow path 8 for the liquid metal on the driven side are separated by a conductor 9, the above-mentioned induced current becomes a loop current, which also flows in the liquid metal on the driven side as shown by the arrow. Due to this induced current and the uniform magnetic field, the liquid metal on the driven side receives a force in the opposite direction to the flow of the liquid metal on the driving side, and flows in the opposite direction.

However, in this electromagnetic 70-canola, in order to control the flow on the driven side while maintaining the flow on the driving side,
This is not possible unless the strength of the magnetic field is controlled manually or by installing a separate control device, or unless a valve or the like is installed in the flow path on the driven side, so it cannot be called a completely passive device. Further, since two independent flow paths are provided that are partitioned off from each other, it cannot be used as it is as a type of fluid stopper that separates two fluids that are in direct contact with each other.

Reference 1) K, Hann@rtz: “App11ngPi
u+3topowarHenerat1on:the
5ecure-PLWR', Nuclear E
ngineering International
+ Nov, 1983 (vol, 28
r)% 348) rpp, 4l-46 2) Hiroaki Wakabayashi'"Overview of PIUS Reactor", UTNL-
R.

0172 (Atomic Crab Science Research Facility, Faculty of Engineering, University of Tokyo) 1985
March 3) D, F, Davidaon r E, Du
ncomba * G, Thatchar: @5oi
1+, a eleatro-technology a
t the R15ley NuclearPower
Development@nt Laboratories
', NuclearEner'+r)'+19
81 * vol, 20, Feb-*A1 t
pp, 79-90 [Object of the Invention] One object of the present invention is to bring two liquid metals with different static pressures into direct contact, to maintain the interface between them in normal conditions, and to allow one fluid to flow in in abnormal situations. The other purpose is to provide a suitable fluid stop, and the other purpose is natural circulation using the same fluid stop! 4I
This electromagnetic fluid stopper is for stopping the flow of highly resistant liquid metal cooling fluids when they are in direct contact with each other, and includes a first flow path through which a fluid with a higher static pressure flows between the two fluids, and a conductor. [A second flow path that is adjacent to the first flow path in parallel through a male partition wall, communicates with the @X flow path at one end, and maintains a direct contact interface between the two fluids inside; and means for generating a magnetic field across the first and second flow paths.

Furthermore, according to the present invention, the first flow path through which the primary liquid metal flows into the reactor core is provided below the reactor core, and communicates with the tank side liquid metal at the upper end and communicates with the first flow path at the lower end. The communicating second flow path is adjacent to the first flow path through a four-sided partition wall, and means for generating a magnetic field across the first and second flow paths is provided, and within the second flow path. A liquid metal cooled tank type fast breeder reactor is provided, characterized in that it is configured to maintain a direct contact interface between a primary liquid metal and a tank side liquid metal.

The principle of the present invention will be explained below.

Figure 14 shows the static pressure distribution in the depth direction of a liquid metal cooled tank type fast reactor with a primary system open to the tank side.

The solid line represents the static pressure distribution of the low temperature liquid metal on the tank side, the dashed line represents the static pressure distribution of the primary thread when the high temperature liquid metal in the primary system is virtually stationary, and the dashed line represents the static pressure distribution when it flows. This shows the static pressure distribution of the primary system when When Figure 14 is compared with Figure 1Q, ΔPrietion > (ρ.-ρh)g)i
That is, the difference is that the pressure drop in the core is larger than the static pressure difference between the primary system and the tank side.

If we consider the case where a fluid stop 14' consisting of a conventional tube group as shown in FIG. Considering the pressure balance at the interface 17 in the fluid stop 14', the pressure on the high temperature coolant 18 side is as shown in Fig. 14.
P0+ρhgh+ΔP, yes.

On the other hand, the pressure on the low temperature coolant 19 side becomes P0+ρcgh.

Unless this difference ΔPKXtar□11 is corrected, the primary system high temperature coolant 18 will flow out from the lower fluid stop 14' to the tank side. This ΔPmxternal
'ir: As a way to correct M, it is possible to apply an electromagnetic brake by applying a magnetic field to the high-temperature coolant that is about to flow downward through the fluid stop 14' in Figures 1 and 1, as shown in Figure 12. It will be done. However, with this method, even if the low-temperature coolant 19 in the tank flows back through the fluid stop l4' and naturally circulates to the reactor core 11 in the event of an accident, it will function as an electromagnetic brake, so functions such as cutting off the magnetic field will not work in the event of an accident. It requires a control circuit and operation, and the inherent safety is not perfect.

Therefore, in the case of a liquid metal cooled tank fast reactor,
A new fluid stop that can correct the static pressure difference ΔP internal shown in FIG. 14 is required. The same fluid stop is set to ΔPixturn when the inlet pump is activated (lPP, pressure is increased).
The flow resistance of the lower fluid stop must be reduced in order to correct the Al and allow the reactor core to be cooled by the natural flow of liquid metal in the tank when the pumps are stopped (in the event of an accident, etc.).

The wcs diagram is the ninth diagram illustrating the basic configuration of the present invention, in which the fluid path 14 is arranged around the lower end of the cylinder 20 that partitions the tank side and the primary system of a tank-type liquid metal cooled fast reactor. .

At the lower end of the cylinder 20, the tank side and the primary system side are in communication as shown in the figure, and the high temperature coolant 18 on the primary system side and the low temperature coolant 19 (both liquid metal) on the tank side are in flow path 14. In the configuration shown in FIG. 5, the partition cylinder 2 o
The coolant on the primary system side flows upward in 18. Channel 14
In order to maintain the boundary surface 17 within the Δ
It is necessary to apply a flow or force to the low temperature coolant in the flow path 14 that can correct Pgxternal.

The present invention is similar to the electromagnetic flow coupler described above, by applying a horizontal magnetic field to the flow path 14 in FIG. Using this principle, an induced current is generated in the liquid metal on the tank side in the flow path 14 downward in the electromagnetic metal (dotted line arrow in the figure), and as a result, during steady operation of the furnace, the above-mentioned ΔPIXt
6r□l is corrected. If the above-mentioned upward flow weakens due to a pump accident, etc., the balance of forces at the interface 17 will collapse, and the liquid metal on the tank side will flow into the primary system, cooling the reactor core 11 through natural circulation 1. I can do it.

[Embodiments of the invention]

FIG. 1 is a schematic sectional view of a part of an embodiment of the fluid stop of the present invention and an embodiment of a tank-type liquid metal cooled fast reactor in which the same is incorporated. Magnets 21 are provided inside the partition tube 20 at the bottom of the core 11 and around the parallel flow path 14 surrounding the bottom of the partition tube 20. Flow path 14 parallel to the vertical direction
is the 1st
As shown in Figure (b) K, the upper part is partitioned into four sections in the circumferential direction by conductive partition walls 23. FIG. 1 (&) is a sectional view taken along line B-0-B' in FIG. It is connected to the. On the other hand, the upper part of the flow passage 14 partitioned by the partition wall 23 is divided into a flow passage connected to the lower part of the core 11 (flow passage) and a flow passage opened to the tank side. .

Figure 2 shows the lines of magnetic force of the magnetic field created by the magnet 21 during steady operation (
The direction of the outflow of the primary 1JIIl coolant (liquid metal) during operation of the cylinder 7'13) and the direction of the dielectric 4'rIL flow are shown. The high-temperature primary liquid metal 18 that has received driving pressure from a pump or the like flows upward through every other channel 14 . The magnet 21 also creates a radial magnetic field within the horizontal section. Since the conductive liquid gold PAis flows perpendicularly (in the vertical direction) to the magnetic field (in the horizontal plane), an induced solder flow in the circumferential direction is generated in the liquid metal 18. Direction, [the flow passes through the bulkhead 23 of proprietary material;
The low-temperature liquid metal 19 on the tank side flows to form a rf current as shown by the solid arrow in FIG. 2(b). The liquid metal 19 on the tank side receives a vertically downward electromagnetic force due to the same Roug trial flow and a radial magnetic field, and is different from the primary side. ! It tries to flow downward. The pressure increase ΔPgmf K caused by this *magnetic force cancels out the pressure pressure ΔPgxternal (see Figure 14) on the tank side, and the liquid metal interface 17 between the primary side and the tank side remains constant throughout the entire flow path 14. Can be held in position.

Figure 3 shows the flow of coolant at the time of an accident when the primary system pump etc. stopped and when it started up. If the pump stops, pipe 22
The driving pressure of the liquid metal inside disappears.

The pressure balance at the boundary surface 17 is disrupted, and the tank side liquid metal 19 comes to flow into the primary side through the flow path 14. In this way, after the reactor scram, due to the generation of decay heat in the reactor core 11, a natural circulation is formed in which a pump, a heat exchanger, etc. are not needed, and the flow path is on the tank side where the flow resistance is small.

The parallel flow path 141 in the magnetic field only functions as a U-shaped electromagnetic flow coupler that circulates the liquid metal 19 on the tank side into the reactor core 11, and there is no substantial increase in flow resistance.

At startup, the natural circulation that takes the flow path on the tank side (the flow shown in figure M3) is started. After startup, the primary side pump '4 is activated and the entire flow from the distribution outlet connected to the tank side is started. Stop and shift to the flow state shown in Figure 2.

FIG. 4 shows the overall configuration of a fast breeder reactor employing the fluid stop (magnetic fluid stop) of this embodiment and the flow of liquid metal during steady state and accident. In the figure, 10 is a pool container, 11 is a reactor core,
12 is a heat exchanger, 13 is a primary system pump, 15 is an upper fluid stop (similar structure to that shown in Fig. 11),
20 is a partition cylinder, 22 is a primary system channel wall, 28 is a free liquid surface of liquid metal, 29 is a heat exchanger secondary side piping, 14 and 21 are the above-mentioned fluid stop channel and magnet, respectively. It is. The core pressure drop ΔPyriction is IMPa, and the four-electric constant σ of sodium at 400°C as a liquid metal is 4.
．． 5 x 10 S/m, and the flow velocity inside the partition tube 20 is u = 2 m/s, and the strength B of the magnetic field required for a magnetic fluid stop of height L = 1 m is calculated from the above formula (1). 0.33 Wb/m2, which is quite achievable.

FIG. 6 shows another embodiment of the liquid metal cooled fast reactor of the present invention. In this embodiment, in the embodiment shown in FIG. 4, the boule 10 is filled with a liquid metal 35 uniformly mixed with a non-fissile material having a large absorption cross section for fast neutrons and thermal neutrons. In addition, the primary system piping is provided with g34, which does not purify the contaminated substances. As in the previous embodiment, in the event of a failure of the pump 13, natural circulation occurs through the boule lO;
The liquid metal containing the neutron absorber that has flowed into the reactor core 11 is
Stop the nuclear fission reaction in step 1. When restarting, the purification system is activated to reduce the concentration of neutron absorbing material in the liquid metal in the primary system, and operation begins. According to this embodiment, the reactor core 1 at the time of an accident
Not only can the decay heat of No. 1 be removed, but the reactor can be shut down without using active equipment such as control rod insertion.

Figure 8g7 shows a liquid metal cooled tank type fast breeder reactor which is a third embodiment of the nuclear reactor of the present invention. A reactor core 11, a heat exchanger 12, and a pump flE are arranged in the tank 10, and magnets 21. A fluid stop consisting of an electromagnetic flow path 14 is provided. The upper and lower parts of the tank are separated by a partition plate 33. When the pump 113 is activated, the liquid metal leaving the pump 13 is heated in the reactor core 11 and flows into the heat exchanger 12 via the upper blemish 100, as shown by the solid arrow. The high temperature primary liquid metal is transferred to heat exchanger 1.
At step 2, the heat is transferred to the low temperature secondary coolant, the temperature is lowered, and the coolant flows out to the lower blenheim 101. The liquid metal in the lower blenheim flows into pump 13 through inlet 131;
It receives a driving pressure and flows back into the reactor core 11 through the primary flow path 22. At the fluid stop, this driving pressure is offset by electromagnetic force, and the liquid metal flows directly from the lower brenum 101 through the flow path 14 into the primary system? It's stopped. When the pump 13 is stopped, the fluid metal in the lower plenum can flow back to the core 11 through the same fluid stop flow path 14 with low flow resistance. According to this embodiment, since a flow path with low flow resistance can be secured when the pump is stopped, the reactor core flow rate is large when the pump is stopped, which improves safety even in conventional tank-type fast reactors.

Another embodiment of the fluid stopper of the present invention will be described with reference to FIG. Two parallel channels 25 and 26 are provided in the magnetic field created by the magnet 210 in a direction perpendicular to the magnetic field (dashed arrow). The flow channel wall 24 and the flow channel separation wall 23 are made of a conductive material 9, and the inner surface of the flow channel perpendicular to the magnetic field is lined with an insulating material 36. There is a gap at the bottom end of the differential flow path! 23 has been removed, so that both channels 25 and 26 are connected at their lower ends. One channel 26
The lower end of is closed by a baffle plate 27.

FIG. 9 shows a structure in which the fluid stop of the embodiment shown in FIG. 8 is installed below the core 11 of a tank-type liquid metal cooled nuclear reactor, and its operation. The illustration of the fluid stops in FIG. 9 has the same correspondence as in FIG. 8(b), and the magnetic field in the flow channels 25, 26 is applied in a direction perpendicular to the plane of the paper. The driving pressure of the pump 13 causes an upward flow in the flow path 25 where the static pressure at the end of the flow path is small. Since the liquid metal, which is a conductive fluid, crosses the magnetic field, an induced current is generated in the liquid metal in a direction perpendicular to the plane formed by the magnetic lines of force and the flow velocity vector, as shown in FIG.

This induced current flows through the separating wall 23 into the liquid metal in the channel 26 and interacts with the magnetic field to produce a downward electromagnetic force in the liquid metal. This force is the strength of the magnetic field and can be set to any strength depending on the region of the magnetic field (ie in the flow path). This downward force cancels out the force caused by the driving pressure of the I pump 13, and the liquid metal in the flow path 26 becomes stationary. On the other hand, when the pump 13 stops, the driving pressure disappears almost instantly because it propagates through the liquid metal at the speed of sound. Therefore, the liquid metal in the flow path 26 flows downward, and then flows through the flow path 25f! : An upward U-shaped flow. As described above, according to this embodiment, the flow between two fluids having an arbitrary magnitude of static pressure difference can be stopped without providing a physical barrier between the two fluids.

〔Effect of the invention〕

According to the electromagnetic fluid stop of the present invention, two conductive fluids with different static pressures are brought into direct contact, and during normal conditions, the static pressure difference is compensated for and the interface is maintained, and during abnormal conditions, the fluid in one flow path is can flow into the other channel. Moreover, the electromagnetic fluid stop of the present invention does not require any changes in operation or function when changing from a steady state to an accident state, and has inherent safety that does not require any control circuitry or operator intervention for changes. have

Further, according to the liquid metal cooled tank type fast reactor of the present invention, during steady operation, the static pressure difference between the high temperature primary liquid metal and the low temperature tank side liquid metal is compensated for, and the latter is kept in direct contact with the latter. Stop the flow to the former, and in the event of a primary system pon f accident (C
The liquid metal flows into the entire core on the tank side, ensuring a natural circulation cooling channel with low flow resistance. Furthermore, when the operation is switched from a steady state of operation to an accident state, there is no need for any movement of moving parts, control circuits, or operator intervention, thereby providing inherent safety.

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) are B-0-B' cross-sectional views and A-A' cross-sectional views of one embodiment of the fluid stopper of the present invention, respectively;
Figures 2 (a) and (b) are B-0-B' and A-A' cross-sectional views, respectively, showing the state of this embodiment during steady operation, and Figure 3 is a diagram showing the state of this embodiment during pump failure. condition, cold B
-0-B' sectional view; FIG. 4 is a sectional view of the tank-type liquid metal cooled fast reactor of the present invention using the above fluid stop; FIG. 5 is a sectional view for explaining the principle of the present invention; FIG. , 'd is a cross-sectional view showing another embodiment of the tank-type liquid metal cooled nuclear reactor of the present invention; FIG. 7 is a cross-sectional view showing still another embodiment of the tank-type liquid metal cooled reactor of the present invention; Figures (a,), (b)
11i and 11i respectively show other embodiments of the fluid stopper of the present invention.
Cross section and A-A' sectional view, Figure 9 is Figure 8 (a)
, (b) is a partial cross-sectional view showing an embodiment of a tank-type liquid metal cooled reactor using a fluid stop; FIG.
A diagram showing the configuration and static pressure distribution of the IAS light water reactor, Figure 11 is a cross-sectional view showing the conventional fluid stop in Figure 10, and Figures 12 (a) and (b) are cross-sectional views showing the conventional electromagnetic brake. 13 is a cross-sectional view of a conventional electromagnetic 70-coupler, and FIG. 14 is a static pressure distribution in a tank-type liquid metal cooled fast reactor. FIG. ■...Liquid metal 2...Magnet 3...Ferromagnetic material 4...Channel wall 5.6...
Magnet 7...Liquid metal on the base side 48...Liquid metal on the driven side 9...Metal conductor partition 10...Pool volume iGl 1...Reactor core 12...Heat exchanger 13 ... Primary system pump 14 ... Lower fluid stop 15 ... Upper fluid stop 16 ... Pressurizer 17 ... Boundary surface of high and low temperature coolant 18
...High temperature coolant 19...Low temperature coolant 20...
・Partition tube 21... Magnet 22... Channel wall
23... Separation 111 Umbrella 24... e Edge plate
25, 26... Channel 27... Obstruction board
28...Free liquid level 29...Next piping to heat exchange 2
30... Heat shield plate 31... Roof nullap 32
... Furnace upper mechanism 33 ... Partition walls are also made of w 34.
...Purification system piping 35...Liquid metal containing neutron absorbing material. :,+-,-"+ Kota Tani Figure 1 (0) Figure 2 (α) Flow between time and start-up Fig. 6 (N=-ko Flow during the accident - 1 sho of the opening of the bonbuoy. Ph< P,, p, Power [11H y King Sword) 1st
Figure 2 (α) (-1 magnetic field = ko) Grasping O Laid flat on a flat surface, flow from the back side towards the front side

Claims (1)

[Claims] 1. An electromagnetic fluid stop for stopping the flow of two conductive fluids with a static pressure difference in direct contact with each other, which of the two fluids has a greater static pressure. A first flow path through which a fluid flows, and is adjacent to the first flow path in parallel with the first flow path through a conductive partition wall and communicates with the first flow path at one end, and has a direct contact interface between the two fluids inside. A magnetic fluid stop comprising: a second flow path for holding; and means for generating a magnetic field across the first and second flow paths. 2. A first channel through which the primary liquid metal flows to the reactor core is provided below the reactor core, and a second channel communicates with the liquid metal on the tank side at the upper end and the first channel at the lower end. disposing the flow channel parallel to and adjacent to the first flow channel via a conductive partition, and providing means for generating a magnetic field across the first and second flow channels;
A liquid metal cooled tank type fast reactor characterized in that it is configured to maintain a direct contact interface between the primary liquid metal and the tank side liquid metal in the second flow path.