JPH0894781A - Coolant circulation device for fusion reactor - Google Patents

Abstract

PURPOSE: To remove the residual heat in heat receiver block connected with a cooling loop having caused an accident even in the case of loss-of-cooling capability in a part of the cooling loop owing to the accident. CONSTITUTION: Coolant supply pipes 10 of a plurality of cooling loops 14a, 14b and 14c, 14d connected to heat receiver blocks 3a, 3b, 3c and 3d of a fusion reactor are connected to each other with supply side connection pipes 19 and 23 provided with open/close valves 18 and 22 in the vicinity of the heat receiver blocks 3a, 3b, 3c and 3d. Simultaneously, coolant return pipes 12 are connected to each other with the return side connection pipes 21 and 25 in the vicinity of the heat receiver blocks 3a, 3b, 3c and 3d. Also, at the position in a heat exchanger 13 close to the connection part of each connection pipes 19, 21, 23 and 25 in the coolant supply pipes 10 and the coolant return pipes 12, switch valves 26a, 27a, 26b, 27b, 26c, 27c, 26d and 27d are arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coolant circulating device for a fusion reactor.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a fusion reactor.
The solenoid coil 1 is provided in the center, and on the outer periphery of it,
A heat receiving device 5 including an inner blanket 2, an outer blanket 3, and a diverter 4 connected to a coolant circulating device (not shown) is arranged, and plasma is confined in a plasma space 6 on the outer periphery of the heat receiving device 5. A toroidal coil 7 and a poloidal coil 8 are provided for this purpose.

The inner blanket 2, the outer blanket 3, the diverter 4 and the like which constitute the heat receiving device 5 are designed to be cooled separately, and the inner blanket 2, the outer blanket 3 and the diverter 4 are individually cooled. As shown by taking the outer blanket 3 as an example in FIGS. 4 and 5, the heat receiving part block 3 is divided into a plurality in the circumferential direction.
a, 3b, 3c, 3d, and each of the heat receiving unit blocks 3a, 3b, 3c, 3d is provided with a coolant 11 such as cooling water or helium via a coolant supply pipe 10 by a pump 9. Supply, heat receiving block 3a, 3b, 3c,
Cooling loops 14a, 14b, 14 for returning the coolant 11 heated in 3d to the heat exchanger 13 such as a boiler or an intermediate heat exchanger via the coolant return pipe 12 and circulating the coolant.
c and 14d are provided. In the figure, 15 is a turbine generator connected to the heat exchanger 13 composed of a boiler,
Reference numeral 16 denotes a pressurizer provided in the cooling loops 14a, 14b, 14c, 14d.

The cooling loops 14a, 14b,
14c and 14d are provided with an auxiliary cooler 17 for removing the residual heat of the heat receiving device 5 after the normal shutdown of the fusion reactor. The inner blanket 2 and the diverter 4 described above are also divided into a plurality of blocks in the circumferential direction,
Similar to the outer blanket 3, each heat receiving unit block is provided with a cooling loop for cooling.

During normal operation of the fusion reactor, each cooling loop 1
The coolant 11 is supplied to the heat receiving block 3a, 3b, 3c, 3d by the operation of the pump 9 of 4a, 14b, 14c, 14d to remove the decay heat due to the plasma, and the heated coolant 11 is transferred to the heat exchanger 13. It is circulated in and cooled.

[0006] In the conventional coolant circulating device for a fusion reactor, when an accident occurs in a part of the cooling loop, for example, the heat exchanger 13 of the cooling loop 14a, and the cooling by the heat exchanger 13 becomes impossible. Will immediately stop the nuclear fusion reactor, but even if the nuclear fusion reactor is stopped, there is still a large amount of residual heat in the heat receiving device 5. Regarding the removal of the residual heat of the nuclear fusion reactor at the time of such an accident, Is not currently considered, and therefore, in the event of such an accident, removal of residual heat by using an auxiliary cooler 17 that removes the residual heat after the normal shutdown of the fusion reactor is decided. Become.

[0007]

However, in the conventional coolant circulating device of the fusion reactor, an accident such as breakage of the coolant supply pipe 10 and the coolant return pipe 12 or damage of a valve not shown occurs. The cooling loops 14a, 14b, 14
When a part of c and 14d loses the cooling capacity, there is a problem that it becomes impossible to remove the residual heat by the auxiliary cooler 17.

The present invention has been made in view of the above circumstances, and even when a part of the cooling loop loses its cooling capacity due to an accident, the heat receiving unit block connected to the cooling loop in which the accident occurred It is an object of the present invention to provide a coolant circulating device for a fusion reactor capable of removing residual heat.

[0009]

According to the present invention, a coolant is supplied through a coolant supply pipe for each heat receiving section block arranged in the circumferential direction of a fusion reactor, and the heated coolant is used as a coolant. A coolant circulation device for a fusion reactor having a cooling loop that circulates to a heat exchanger via a return pipe, wherein the coolant supply pipes of a plurality of cooling loops receive heat by a supply-side connecting pipe equipped with an on-off valve. Part of the cooling loop, the cooling material return pipes of the plurality of cooling loops are connected to each other at a position close to the heat receiving part block by a return side connecting pipe having an opening / closing valve, and the cooling material supply pipe and the cooling A coolant circulating device of a fusion reactor, characterized in that a switching valve is arranged at a position on the heat exchanger side in the material return pipe close to each connecting pipe connecting portion, and a supply side connecting pipe and a returning side connecting pipe. Fusion reactor characterized by having an annular shape Coolant circulation system, in which according to the.

[0010]

According to the first and second aspects of the invention, the coolant supply pipes of the plurality of cooling loops connected to each of the heat receiving part blocks in which the heat receiving part is divided into a plurality of parts are connected to each other on the supply side connecting pipe (opening valve). Or the connection pipe of the annular supply side)
The coolant return pipes of a plurality of cooling loops are connected to each other by a return side communication pipe (or an annular return side communication pipe) equipped with an on-off valve
Since the switching valve is arranged at the heat exchanger side position near each connecting pipe connection part in the coolant supply pipe and the coolant return pipe, the coolant supply pipe and the coolant return pipe are broken or the valve is provided. When a part of the cooling loop loses its cooling capacity due to the occurrence of an accident such as damage to the heat receiving part block connected to the cooling loop where the accident occurred to another cooling loop,
As a result, the residual heat of the heat receiving block connected to the cooling loop where the accident occurs can be shared by another cooling loop and safely removed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 3, the outer blanket 3 is shown as an example of the heat receiving device 5 including the inner blanket 2, the outer blanket 3 and the diverter 4 arranged in the circumferential direction of the fusion reactor. 1, the heat receiving section blocks 3a, 3b, 3 divided into a plurality of sections will be described.
For each of c and 3d, the coolant 11 is provided through the coolant supply pipe 10.
Cooling loops 14a, 1 for circulating the heated coolant 11 to the heat exchanger 13 via the coolant return pipe 12
4b, 14c, 14d.

Two adjacent cooling loops 14a and 14b
The coolant supply pipes 10 and 10 of the
a and 3b are connected by a supply-side communication pipe 19 equipped with an on-off valve 18, and coolant return pipes 12, 12 are provided.
The two are connected to each other by a return side connecting pipe 21 equipped with an on-off valve 20 at a position close to the heat receiving block 3a, 3b.

Two adjacent cooling loops 14c and 14d
The coolant supply pipes 10 and 10 of the
c, 3d are connected by a supply-side communication pipe 23 equipped with an on-off valve 22 at a position close to
The two are connected to each other by a return side connecting pipe 25 having an opening / closing valve 24 at a position close to the heat receiving block 3c, 3d.

Further, the connecting pipes 19, 21, 23, 25 in each of the coolant supply pipe 10 and the coolant return pipe 12 are connected.
At the heat exchanger 13 side position close to the connection part of the switching valve 26
a, 27a, 26b, 27b, 26c, 27c, 26
d and 27d are provided.

The on-off valves 18, 20, 22, 24 and the switching valves 26a, 27a, 26b, 27b, 26c, 27.
Opening and closing of c, 26d, and 27d are automatically controlled by a controller (not shown).

Next, the operation of the above embodiment will be described.

In the above embodiment, the opening / closing valves 18, 2 of the connecting pipes 19, 21, 23, 25 are operated during normal operation of the fusion reactor.
0, 22, 24 are closed, and the switching valves 26a, 27a, 2
6b, 27b, 26c, 27c, 26d, 27d are held in an open state, and the plurality of heat receiving unit blocks 3
a, 3b, 3c, 3d are cooling loops 14a, 14 respectively
It is independently cooled by b, 14c and 14d.

In the above structure, even when some cooling loops lose their cooling ability due to an accident such as breakage of the coolant supply pipe 10 and the coolant return pipe 12 or damage to the valve, they are connected to another cooling loop. By doing so, it is possible to remove the residual heat of the heat receiving portion connected to the cooling loop in which the accident has occurred by using it in another cooling loop.

That is, the case where an accident occurs in the cooling loop 14a in FIG. 1 will be described as an example. When an accident occurs, the fusion reactor is stopped, but at the same time, the switching valve 26a is operated. , 27a are closed to prevent the coolant 11 from flowing to the heat exchanger 13 side, and the open / close valve 18,
By opening 20, the coolant 11 of the coolant supply pipe 10 of the cooling loop 14b is replaced with the coolant loop 14 in which the accident has occurred.
a is supplied to the heat receiving unit block 3a connected to the heat receiving unit block 3a, and the coolant 11 heated by the heat receiving unit block 3a is returned to the coolant return pipe 12 of the cooling loop 14b.

As a result, the cooling loop 1 in which the accident has occurred
4a is connected to the heat receiving block 3a residual heat,
It can be reliably removed by another adjacent cooling loop 14b to enhance the safety of the fusion reactor.

FIG. 2 shows another embodiment of the present invention, in which the heat receiving section blocks 3a, 3b, 3 formed in an annular shape.
An annular supply-side communication pipe 28 and an annular return-side communication pipe 29, which are formed annularly along c and 3d, are arranged, and the annular supply-side communication pipe 28 is connected to the plurality of cooling loops 14a, 14b, 14 respectively.
In addition to being connected to the coolant supply pipes 10 of c and 14d, the annular return side communication pipe 29 is connected to each of the plurality of coolant return pipes 12, and the annular supply side communication pipe 28 and the annular return side communication pipe 2 are connected.
Each of the nine cooling loops 14a, 14b, 14
Open / close valves 28a, 28 so that c and 14d can communicate with each other.
b, 28c, 28d and 29a, 29b, 29c, 29
Arrange d.

In the embodiment of FIG. 2 described above, when a part of the cooling loop, for example, the cooling loop 14a loses its cooling capacity due to an accident, the cooling loop 14a in which the accident has occurred is replaced with another cooling loop 14b or 14c or 14d. Or one of two cooling loops 14b and 14c, or 14c and 14d, or 14
a to 14d, the residual heat of the heat receiving block 3a of the cooling loop 14a in which the accident has occurred is removed by another arbitrary cooling loop (or is shared by a plurality of cooling loops) and removed. The safety of the fusion reactor can be improved.

[0024]

According to the first and second aspects of the present invention, even if a part of the cooling loop loses its cooling capacity due to an accident, the heat receiving block connected to the cooling loop in which the accident has occurred is cooled separately. By connecting to the loop, the residual heat of the heat receiving block connected to the cooling loop where the accident occurred can be removed by another cooling loop as well. An excellent effect of enhancing safety can be achieved.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing another embodiment of the present invention.

FIG. 3 is a partially cutaway perspective view showing an example of a nuclear fusion reactor.

FIG. 4 is a perspective view showing a part of a coolant circulating device of a conventional fusion reactor.

FIG. 5 is a plan view showing an example of a conventional coolant circulating device for a fusion reactor.

[Explanation of symbols]

 3a Heat receiving part block 3b Heat receiving part block 3c Heat receiving part block 3d Heat receiving part block 10 Coolant supply pipe 11 Coolant 12 Coolant return pipe 13 Heat exchanger 14a Cooling loop 14b Cooling loop 14c Cooling loop 14d Cooling loop 18 Opening valve 19 Supply Side connecting pipe 20 Open / close valve 21 Return side connecting pipe 22 Open / close valve 23 Supply side connecting pipe 24 Open / close valve 25 Return side connecting pipe 26a Change valve 26b Change valve 26c Change valve 26d Change valve 27a Change valve 27b Change valve 27c Change valve 27d Change valve Valve 28 Annular supply side communication pipe 28a Open / close valve 28b Open / close valve 28c Open / close valve 28d Open / close valve 29 Return side communication pipe 29a Open / close valve 29b Open / close valve 29c Open / close valve 29d Open / close valve

Claims (2)

[Claims] 1. A coolant is supplied through a coolant supply pipe to each heat receiving unit block arranged in the circumferential direction of a fusion reactor, and the heated coolant is passed through a coolant return pipe to a heat exchanger. A coolant circulating device for a nuclear fusion reactor having a cooling loop for circulation to a plurality of cooling loops, wherein the coolant supplying pipes of a plurality of cooling loops are connected to each other at a position close to the heat receiving block by a supply side connecting pipe having an on-off valve. Along with, the coolant return pipes of the plurality of cooling loops are connected to each other at a position close to the heat receiving section block by a return side communication pipe provided with an on-off valve, and the communication pipes in the coolant supply pipe and the coolant return pipe. A coolant circulating device for a fusion reactor, wherein a switching valve is arranged at a position on the heat exchanger side near the connecting portion. 2. The coolant circulation device for a nuclear fusion reactor according to claim 1, wherein the supply-side communication pipe and the return-side communication pipe have an annular shape.