JPS5931479A - Tank type fast breeder - 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 [Technical Field of the Invention] The present invention relates to a tank-type fast breeder reactor that uses liquid sodium as a coolant.

[Technical background of the invention]

In general, tank-type fast breeder reactors use atoms! Since the P valley has a large diameter, the roof slab also has a large diameter. Therefore, during an earthquake, this roof slab may vibrate in a different mode than the reactor vessel. For this reason, the fti! installed on the roof slab 111j! I go 4! I! The drive mechanism vibrates in a mode different from that of the reactor core, and the control rods gripped by the control rod drive mechanism are displaced relative to the core, raising the possibility that reactor control may become unstable. .

In order to prevent such problems, a fast breeder reactor as shown in FIG. 1 was developed. That is, in the figure, reference numeral 1 denotes a reactor vessel, in which a primary coolant A is accommodated, and its upper end is closed by a roof slab 3 having a fixed plug 2a and a rotating plug 2b. Further, a reactor core 4 is housed within the reactor vessel 1 . A cylindrical suspension shell 5 suspended from the lower surface of the roof slab 3 by a flange portion 5a is missing, and the reactor core 4 is suspended by the suspension shell 5. Secondary cooling pipes 6a, 6 are provided between the outer periphery of the suspension shell 5 and the inner periphery of the reactor vessel 1.
An intermediate heat exchanger 6 for exchanging heat between the secondary coolant and the primary coolant flowing through the pipe b, and a circulation bong 7''7 provided with a drive section 7a are provided. Heat exchanger 6 and circulation, JR engine 07 is casing 8
..., 9... is housed within.

In addition, a partition wall 10 made of stacked plates is installed horizontally in the center of the reactor vessel.This partition wall 10 divides the inside of the reactor vessel 1 into upper and lower parts, and the upper part is a thermal plenum. 11. The lower part is formed into a cold plenum 12.

Further, 13... is a steady rest member, and the core 4 is supported in the horizontal direction by this steady rest member 13...
It prevents pregnancy.

In addition, a plurality of 70-holes 1 are provided on the peripheral wall of the body 5 (for the above).
4... is provided. Then, the high-temperature coolant flowing out from the upper end of the core 4 passes through the suspension shell 5 and flows out from 9.70-hole 14... to the high-temperature plenum 1, and from this high-temperature plenum 11 to the intermediate fA9:i! l! ! The coolant that flows into the reactor 6, undergoes heat exchange with the secondary coolant, and becomes low temperature flows into the low temperature plenum I2, and is further sent into the reactor core 4 via the artificial pipe 15 by the circulation bong 7°7. has been done. In this case, the core 4 is suspended from the roof slab 3 by the suspension shell 5, so in the event of an earthquake, the core 4 vibrates in the same mode as the roof slab 3, and therefore the control rods and the core 4 vibrate in the same mode. Select one that does not cause relative displacement.

[Problems with background technology]

In the conventional tank-type fast breeder reactor, high-temperature coolant flows in the high-temperature plenum 1, so the high-temperature coolant comes into contact with the reactor vessel 1, causing excessive thermal stress to the reactor vessel 1. There was a problem that occurred. Furthermore, since the entire interior of the cylindrical lunium 1 is filled with high-temperature coolant, this high-temperature coolant accumulates in large quantities, making it troublesome to remove heat when the reactor is shut down.

In addition, in this conventional tank-type fast breeder reactor, one partition wall 10 divides the interior of the reactor vessel 1 into a 16-temperature glenum 11 and a low-temperature solenoid 2. Because it comes into contact with the coolant and the low-temperature coolant, thermal deformation is large, and a complicated structure is required to release this thermal deformation.

[Purpose of the invention]

The present invention was developed based on the above gradient S, ff4, and its purpose is to reduce the thermal stress generated in the reactor vessel,
It is an object of the present invention to provide a tank-type fast breeder reactor which can reduce the amount of high-ffC coolant, facilitate heat removal during shutdown, and further simplify the structure.

[Summary of the invention]

The present invention communicates the inside of the suspension j with the intermediate heat exchanger through a communication pipe,
The structure is such that high-temperature cooling water is sent directly to the intermediate heat exchanger via this communication pipe. Therefore, the high-temperature coolant does not come into contact with the reactor vessel, and the thermal stress on the reactor vessel can be significantly reduced.Also, since the high-temperature cooling material exists only in the suspension shell, the high-temperature coolant does not come into contact with the reactor vessel. The amount of coolant 141 is small, making it easier to remove heat during shutdown.

In addition, it is necessary to partition the inside of the reactor vessel with complex partition walls.
Since there is no t and this partition wall becomes unstable, the structure becomes simpler.

[Embodiments of the invention]

An embodiment of the present invention will be explained below with reference to FIG.

In the figure, reference numeral 101 denotes a reactor vessel, in which primary coolant A is accommodated, and its upper end is fixed slab 102 &
and a roof slab 103 with a rotation lug 102b. Further, a reactor core 104 is housed within the reactor vessel 101 . A cylindrical suspension shell 105 is suspended from the bottom surface of the roof slab 103 by a flange portion 105a, and the reactor core 104 is suspended by this suspension shell 105. Between the outer periphery of the shell 105 and the inner periphery of the reactor vessel 10, a medium U heat exchanger 106 and a circulation pump 1 are installed.
07... is provided.

In addition, these intermediate heat exchanger 106 and circulation bong 7''1
07 is housed in the casings 108...1109... Further, reference numeral 113 is a steady rest member that supports the reactor core 104 in the horizontal direction and serves as a steady rest.

A communication pipe 114 connects the inside of the suspension barrel 105 and the inside of the casing 108 of the intermediate heat exchanger 106 . The high-temperature coolant inside the hanging barrel 105 is connected to this communication pipe 114...
The heat exchanger 106 is configured to be sent directly to the intermediate heat exchanger 106 through the.

Note that the communication pipe 114 is provided above the reactor core 104 and is configured so as not to impede the natural convection of the coolant during shutdown. In addition, this communication pipe 114...
is combustible, and the hanging shell 10 may be damaged during earthquakes or due to thermal expansion.
5 and the casing 108 of the intermediate heat exchanger 106...
・It is configured to allow relative displacement with. In addition, heat insulating materials 1 and 5 are provided on the inner surfaces of the hanging barrel 105 and the communication pipes 114 to limit heat conduction from high-temperature cooling and reduce thermal stress. It is configured. The primary coolant A sent to the intermediate heat exchanger 106 exchanges heat with the secondary coolant sent through the secondary coolant pipes 106h and 106b, and becomes low temperature and outputs "1.θ
106C and flows into the reactor vessel 101. The primary coolant flowing into the reactor vessel 101 is driven by f:;! 107
The inlet 1 of the circulation pump 107 driven by a
07b and enters the reactor core 104 through the 11°
is configured to be sent to.

Next, the operation of this embodiment will be explained.

The coolant that has reached a high temperature after passing through the reactor core 104 flows out into the suspension shell 105. The high-temperature coolant is then sent to the intermediate heat exchanger 106 through the communication pipes 114 and exchanged heat with the secondary coolant.

Then, the coolant that has become low temperature flows into the reactor vessel 10 and is sent to the reactor core 104 by the circulation bombs f107.

In this case, the high-temperature coolant is directly sent from inside the suspension shell 1θ5 to the intermediate heat exchanger 106 through the communication pipe 114, so the high-temperature coolant does not come into contact with the reactor vessel 101. Thermal stresses in the reactor vessel 10 are significantly reduced. Furthermore, since the high-temperature cooling system exists only in the suspension shell 105, its amount is small, and the amount of heat removed when the reactor is shut down is 8'A. Also, this one is reactor vessel 101
There is no need to partition the inside, and there is no need for partition walls, so the structure is simple.

[Effects of the Invention] As described above, the present invention is configured such that the inside of the suspension shell is communicated with the intermediate heat exchanger through a communication pipe, and the high-temperature coolant is sent directly to the intermediate heat exchanger via the communication pipe. It is. therefore,
The high-temperature coolant does not come into contact with the reactor vessel, which can significantly reduce the thermal stress on the reactor vessel, and since the high-temperature coolant is only present in the suspension shell, this high-temperature coolant is The amount of coolant is small, making it easier to remove heat during shutdown. In addition, there is no need to partition the inside of the reactor vessel with complicated partition walls, and since this partition wall is no longer necessary, the structure is simplified, and other advantages are obtained.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a conventional example. FIG. 2 is a longitudinal sectional view of an embodiment of the present invention. 101... Reactor vessel, 103... Roof slab,
104... Core, 105... Hanging shell, "10'6...
・Intermediate heat exchanger, 107...Circulation pump, 114...
Connecting pipe, 115...insulation material.

Claims (3)

[Claims] (1) A reactor vessel, a roof slab that closes the upper end of the reactor vessel, a reactor core housed in the reactor vessel, and a cylindrical shape that projects from the lower surface of the roof slab and suspends the core. a hanging shell, an intermediate heat exchanger and a lump pump 0 disposed between the outer periphery of the hanging shell and the inner periphery of the reactor vessel, and communication for communicating the inside of the hanging shell and the intermediate heat exchanger; A tank-type high-speed ship reactor characterized by being equipped with a pipe. (2) A patented tank-type fast increase reactor characterized in that the communication pipe has no flexibility. (3) Claim 1, characterized in that a heat insulating material is pasted on the inner surface of the front hα hanging body and the communicating pipe.
Tank-type Hatake Breeder Reactor as described in .