JPS58201089A - 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] The present invention relates to a tank-type fast breeder reactor.

I will clarify. In the figure, 1 indicates the reactor vessel. This reactor vessel 1
The upper opening 1 of the roof slab 2 is closed off by the roof slab 2. Inside the reactor vessel 1, a plurality of fuel assemblies 3A,
A reactor core 3 composed of control rods 3B and the like is housed in a predetermined position.

This core 3 is supported by a core support structure 4.

An intermediate heat exchanger 5 and a circulation pump 6 are installed in the reactor vessel 1 on the outer periphery of the core support structure 4.
It is installed through the A control rod drive mechanism 7 is installed which similarly penetrates the roof slab 2 and is supported by the roof slab 2 to drive the control rod. The core support structure 4 is suspended from the roof slab 2 via a hanging shell 8. Therefore, the core support structure 4 that supports the reactor core 3 and the control rod drive mechanism 7 are both supported by the roof slab 2, and even if vibration occurs in the vertical direction due to an earthquake or the like, relative displacement between the two will not occur. It is possible to prevent the control rods 3B from being displaced with respect to the reactor core 3 during an earthquake, thereby preventing control from becoming unstable.

A plurality of outflow ports 8A are formed in the side wall of the hanging drum 8. Further, a steady rest member 9 is provided between the core support structure 1c4 and the reactor vessel 1. This steady rest member 9 is configured to suppress horizontal swing of the reactor core 8 suspended by the suspension barrel 8. Further, this steady rest member 9 divides the inside of the reactor vessel 1 into upper and lower halves, and the upper part is an upper plenum 10. It also functions as a partition wall with the lower plenum 1 located below. Note that 12 in the figure indicates a coolant contained in the reactor vessel 1.

According to the above configuration, the coolant 12 rises from the bottom to the top of the reactor core 3, and its temperature increases at this time.

The coolant 12, which has reached a high temperature, flows into the suspension shell 8 and flows out of the suspension shell 8 through the outlet 8A. The coolant then flows into the intermediate heat exchanger 5 from the inlet of the intermediate heat exchanger 5, where it exchanges heat with a secondary coolant (not shown). The cooled coolant 12 flows into the lower plenum from the outlet of the intermediate heat exchanger 5, is pressurized by the circulation pump 6, and then flows into the core 3 again.
It is configured to be sent downward.

[Problems with background technology]

According to the above configuration, the high-temperature coolant flows into the upper solenum formed above the steady rest member 9. The reactor vessel is thus in contact with the high temperature coolant. Further, the steady rest member 9 having a partition function has its upper surface in contact with a high-temperature coolant, and its lower surface in contact with a low-temperature coolant. and,
The reactor vessel 1 is structurally strong in order to support the load of a large amount of coolant and various equipment housed inside, and the anti-sway member 9 also prevents horizontal shaking of the reactor core 3 during an earthquake. It is structurally strong to prevent this, and both have high rigidity.

For this reason, when a high-temperature coolant comes into contact with the reactor vessel 1 or the steady rest member 9, there is a problem in that excessive thermal stress is generated because there is little escape of thermal deformation.

[Purpose of the invention]

An object of the present invention is to form a high-temperature coolant flow path by providing an intermediate heat exchanger shell to surround the intermediate heat exchanger and communicating the inside of the hanging shell and the inside of the intermediate heat exchanger shell through a communication pipe. Another object of the present invention is to provide a fast breeder reactor having a structure in which high-temperature coolant does not come into direct contact with the reactor vessel or the steady rest member, and in which thermal stress is not generated in the reactor vessel or the steady rest member.

[Summary of the invention]

The fast breeder reactor according to the present invention is provided with a reactor vessel, a roof slab that closes the upper opening of the reactor vessel, a reactor core provided within the reactor vessel, and a suspension shell suspended from the slab. An intermediate heat exchanger is provided between the outer peripheral surface of the shell and the inner peripheral surface of the reactor vessel, and an intermediate heat exchanger shell is provided to surround the intermediate heat exchanger, and this intermediate heat exchanger -5-
rr This configuration includes a communication pipe that communicates the inside of the exchanger shell and the inside of the hanging barrel.

That is, the outer periphery of the intermediate heat exchanger is surrounded by an intermediate heat exchanger shell, and the inside of the suspension shell and the intermediate heat converter shell are communicated with each other through a communication pipe, so that high-temperature coolant is directly sent to the intermediate heat converter.

Therefore, the high-temperature coolant flows directly from the inside of the suspension shell into the intermediate heat exchanger shell via the communication pipe, so the high-temperature coolant does not come into direct contact with the reactor vessel or steady rest members, and No large thermal stresses occur in the stop member.

[Embodiments of the invention]

A first embodiment of the present invention will be described with reference to FIG. In the figure, 101 indicates a reactor vessel housing the coolant 100. The upper opening JOIA of this reactor vessel 101 is closed by a roof slab 102. Inside the reactor vessel 101, there are a plurality of fuel assemblies xo'th, control rods 1θ
A core (JIHψ・3) consisting of 3B, etc. is installed at a predetermined position. This core 103 is supported by a core support structure 1 H-6- relic 104. This core support structure 1θ
4. An intermediate heat exchanger 10 is located inside the reactor vessel 101 on the outer periphery.
5 and a circulation pump 106 are installed passing through the roof slab 102. Same as above roof slab 10
A control rod drive mechanism 107 is installed that passes through the roof slab 2 and is supported by the roof slab 102 to drive the control rods. Further, the core support structure 104 is a cylindrical suspension structure J.
It is suspended from the roof slab 102 via the OB. That is, the core support structure 10 that supports the core 103
4 are both supported by the roof slab 102,
Even if vibration occurs in the vertical direction due to an earthquake or the like, the relative displacement between the two is extremely small. A steady rest member 109 is provided between the core support structure 104 and the reactor vessel 101. This steady rest member 1
Core support structure 1 supporting core 103 by 09
This is a configuration that suppresses the horizontal shake of 04.

An intermediate heat exchanger shell 110 is provided on the outer peripheral side of the intermediate heat exchanger 105 so as to surround the intermediate heat exchanger 105. This intermediate heat exchanger shell 110 is supported by the steady rest member 109. The interior of the intermediate heat exchanger shell 110 and the interior of the suspension shell 10B are communicated through a communication pipe 111. That is, the configuration is such that high-temperature coolant is directly channeled from the suspension shell 108 to the intermediate heat exchanger shell 110 via the communication pipe 111. Therefore, the suspension shell 108, the intermediate heat exchanger shell 110, and the communication pipe 111 form a boundary between the high-temperature refrigerant and the low-temperature refrigerant. Therefore, the high temperature coolant in the suspension shell 108 flows into the intermediate heat exchanger shell 110 through the communication pipe 111 and does not come into contact with the reactor vessel 101.
5. Furthermore, a reactor vessel 1 is provided in the upper part of the reactor vessel 101 outside the intermediate heat exchanger shell 105.
The structure is such that low-temperature coolant flows in from below 01 to maintain the reactor vessel 101 at a low temperature.

The operation will be explained based on the above configuration. First, coolant 1
00 flows through the core 103 from the bottom to the top, raising the temperature at that time. The heated coolant 100 flows into the suspension shell 10B. Then, the communication pipe 11 is passed through the intermediate heat exchanger shell 1.
10 and flows into the intermediate heat exchanger 105 from an inlet (not shown) of the intermediate heat exchanger 105.

This high-temperature coolant exchanges heat with a secondary coolant (not shown) in the intermediate heat exchanger 105, and the low-temperature coolant flows from the outlet (not shown) of the intermediate heat exchanger 105. It flows out below the reactor vessel 101. and circulation pump 106
The structure is such that the fuel is pressurized by the reactor core 103 and sent again to the lower part of the reactor core 103.

Therefore, the reactor vessel 101 and the steady rest member 109
Only low-temperature coolant comes into contact with the tube, which prevents excessive thermal stress from occurring.

Next, a second embodiment of the present invention will be described with reference to FIG.

In this second embodiment, an intermediate heat exchanger shell 110 is supported by a suspension shell 108 via a plurality of support members 112. In the first embodiment, the intermediate heat exchanger shell 110 is supported by the steady rest part #109, but the support by the steady rest member 109 is discontinued and a supporting member 112 is provided, thereby making it possible to connect the communication pipe 111 to the hanging pipe. The installation of the connecting pipe 111 and the intermediate heat exchanger shell 110
The mounting structure is designed to relieve stress on the parts. The other configurations are the same as those of the first embodiment.

Next, a third embodiment will be described with reference to FIG.

In this third embodiment, an intermediate heat exchanger shell 110 is supported by a steady rest member 109.

A communication pipe 111 that communicates the suspension shell 108 with the intermediate heat exchanger shell 110 is made of a flexible pipe. The lower end of the casing 105 of the intermediate heat exchanger 105 is connected to the lower end of the intermediate heat exchanger shell 110 via a flexible joint 113.

And this'! In the s3 embodiment, the communication tube JJJ is made of a flexible tube having elasticity, so that the relative displacement between the hanging shell 10B and the intermediate heat exchanger 105 can be absorbed.

Although the intermediate heat exchanger shell 110 is supported by the steady rest member 109 or the hanging frame 10B in the above-described embodiments 1 to 3, it may be supported in a suspended state from the roof slab 102.

〔Effect of the invention〕

The fast breeder reactor according to the present invention includes a reactor vessel, a roof slab that closes an upper opening of the reactor vessel, a reactor core within the reactor vessel, and a reactor core that supports the reactor core within the reactor vessel. A support structure is provided, a suspension shell for suspending the core support structure from the roof slab is provided, an intermediate heat exchanger is provided between the outer circumferential surface of the suspension structure and the inner circumferential surface of the reactor vessel, and An intermediate heat exchanger shell is provided to surround the heat exchanger, and a communication pipe is provided to communicate the inside of the intermediate heat exchanger shell and the inside of the suspension shell.

That is, the outer periphery of the intermediate heat exchanger is surrounded by an intermediate heat exchanger shell, and the inside of the suspension shell and the intermediate heat exchanger shells 11-11o...intermediate heat exchanger shell, 111...communicating pipes.

The high-temperature coolant is directly sent to the intermediate heat exchanger by communicating with the intermediate heat exchanger through a communication pipe.

Therefore, the high-temperature coolant flows directly from the inside of the suspension shell into the intermediate heat exchanger shell via the communication pipe, so the high-temperature coolant does not come into direct contact with the reactor vessel or steady rest members, as in the case of conventional reactor vessels. No large thermal stress is generated in the container or the steady rest member. In addition, since the hanging body, the communicating pipe, and the intermediate heat exchanger shell also perform the conventional partition wall function, the structure can be simplified and other effects are great.

FIG.

101... Reactor vessel, 102... Roof slab,
103... Core, 104... Core support structure, 10
5... Intermediate heat exchanger, 10B... Woven cylinder, 12-

Claims (2)

[Claims] (1) A reactor vessel, a roof slab that closes the upper opening of the reactor vessel, a core provided within the reactor vessel, and a core support structure provided within the reactor vessel that supports the core. a suspension shell for suspending the core support structure from the roof slab; an intermediate heat exchanger provided between the outer peripheral surface of the suspension shell and the inner peripheral surface of the reactor vessel;
A fast breeder reactor comprising: an intermediate heat exchanger shell provided to surround the intermediate heat exchanger; and a communication pipe that communicates the inside of the intermediate heat exchanger shell with the inside of the hanging shell. (2) The fast breeder reactor according to claim 1, wherein the communication pipe has flexibility.