JPS61794A - Cooling device for liquid-metal cooling type reactor - 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 1] The present invention relates to a cooling device for a secondary cooling IJI system installed outside a reactor vessel as cooling equipment for a liquid gold rFh-cooled nuclear reactor. .

[Technical background of the invention and its problems] In fast breeder reactors that use liquid metal coolant, the reactor coolant, that is, the primary coolant, has a high level of radioactivity. It is necessary to separate the system from the steam generation system. In addition, heat exchange between liquid metal and water is essential in the process of generating steam to be supplied to a turbine generator. Since the chemical reaction heat generated by contact between the two is enormous, it is necessary to dissipate this heat, so a secondary cooling system is roughly installed between the primary cooling system and the steam generation system. There is. A secondary cooling system in a conventional liquid metal cooled nuclear reactor will be explained with reference to FIG. A reactor core 2 is disposed within the reactor vessel 1, and a primary main circulation pump 4 that circulates a liquid metal coolant 3 for cooling the reactor core 2 within the reactor vessel 1.

A primary cooling system is arranged, which includes an intermediate heat exchanger 5 that performs heat exchange between the primary coolant and the secondary coolant.

The secondary cooling system includes an intermediate heat exchanger 3, a steam generator 6 that generates steam to be supplied to a turbine generator (not shown), and a vertical mechanical type 2 for circulating the secondary cooling system. It consists of a secondary main circulation pump 8 and piping 7 that connects these devices. In the above conventional example, 2
In rearranging the secondary cooling system, the steam generator 6 and the secondary main circulation pump 8 were placed in separate rooms by a wall 9. In addition, since both the steam generator 6 and the secondary main circulation pump 8 serve as a single anchor point for the connecting piping 7, the piping installed between each device must be meandering to absorb thermal expansion, which requires a long piping length. There was a problem with the length of time.

[Objective of the Invention 1 The present invention has been made in view of the above circumstances, and its purpose is to simplify the equipment arrangement, shorten the piping length, and reduce the space volume of the reactor building and reactor auxiliary building. The present invention provides a cooling device for a liquid metal cooled nuclear reactor.

[Summary of the Invention] In order to achieve the above objects, the present invention comprises a system in which an intermediate heat exchanger disposed inside a nuclear reactor vessel and a steam generator disposed outside the reactor vessel are connected by piping. In the secondary cooling system of a liquid metal cooled nuclear reactor, a liquid metal inlet distribution pipe is provided at the upper part of the body shell of the steam valve/l-reactor, and a liquid metal inlet distribution pipe is provided approximately in the center of the body shell of the steam generator. A metal L110 upper E pipe is provided, an electromagnetic pump is disposed inside the outlet riser pipe, and a liquid metal level is provided inside the main body of the steam generator. Further, an electromagnetic pump has a stator spirally wound around a coated cable and a cylindrical external iron core disposed outside the stator.

[Embodiments of the invention] An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a secondary cooling system diagram of a liquid metal cooled nuclear reactor according to an embodiment of the present invention. In the figure, a primary main circulation pump 1 is installed in a reactor vessel 10 that includes a reactor core 11.
A primary cooling system for the nuclear reactor is provided, which includes a reactor 2 and an intermediate heat exchanger 13. The secondary cooling system includes an intermediate heat exchanger 13,
It consists of a steam generator 17 and a pipe 16 that penetrates the wall 15 to connect the intermediate heat exchanger 13 and the steam generator 17, and an electromagnetic pump 18 is disposed inside the steam generator 17. has been done.

FIG. 2 is a longitudinal sectional view showing details of the steam generator 17. As shown in the figure, the steam generator 17 includes a main body shell 19 and main body support scars 1 to 20, including heat transfer tubes 21. Contains structures. The liquid metal inlet section is composed of the liquid metal pipe 16, the liquid metal inlet header 24, and the liquid metal one-way pipe 25.

Incidentally, a liquid surface 28 is formed inside the upper part of the main body shell 19 for absorbing changes in the volume of the liquid metal.

□In addition, a nozzle 22 for liquid metal 1 to 2 is provided at the bottom of the main body WA19, and a steam generator 17 is also provided.
In the central part of the interior, a gastric tube 26 is placed in the eye of the liquid metal.
Further, a heat exchanger tube bundle inner shroud 27 is disposed outside the outlet riser pipe 26.

On the other hand, a water inlet pipe 29 into which water flows from a water supply pump (not shown), a water inlet header 30, a water inlet [1-section pipe 31], and a water inlet [] water chamber 32 constitute a water inlet part. Further, the outlet steam chamber 33, the outlet steam distribution pipe 34, the outlet steam header 35, and the outlet steam piping 36 constitute a steam outlet section.

The electromagnetic pump 18 is inserted into the upper part of the liquid metal outlet riser pipe 26 via the installation flange 43, and is converted from a three-phase power cable 41 into a coated cable 40 such as an Ml cable at a terminal box 42 and then into the liquid metal. The part of the existing stator 38 is covered with the above-mentioned covered cable 40 installed in a spiral shape, and an annulus space 37 in which liquid metal flows is arranged outside, and a cylindrical outer 1% r639 is arranged. This is what I did.

The outlet portion of the liquid metal is mainly constituted by the annulus space 37 in the epigastric tube 26 and the electromagnetic pump 18 portion, and the ascending tube 26.

Next, the operation of the embodiment described in -F will be explained.

By circulating the primary coolant that cools the heat generated in the reactor core 11 using the primary main pump 12, the intermediate heat exchanger 13
to the secondary cooling system. The liquid metal as a secondary coolant is circulated by the electromagnetic pump 18 built in the steam generator 1 1γ, and the high-temperature liquid metal heated in the intermediate heat exchanger 13 passes through the pipe 16 and then enters the liquid metal inlet header 24. Then, the liquid metal is distributed into the first distribution pipe 25, and then flows into the upper inner side of the main body 19 of the steam generator 17. The high quality liquid metal then flows down the outside of the heat transfer tube 21 and cools down by applying heat to water and steam, becoming a low-temperature liquid metal. Such low-temperature liquid metal flows into the lower chain part 23 of the main body 1j119 (the flow direction is reversed and the outlet upper back pipe 26
- inspect the inside of the The pressurized liquid metal flows through the annulus space 37 between the external iron core 39 and the stator 38 due to the electromagnetic induction of the electromagnetic pump 18, and then flows out again. Then, color scheme 16 is reached.

On the other hand, on the water/steam side, water is fed from the water supply bottle 1'h1 (not shown) through the water inlet piping 29 to the water inlet header 3.
0, after being distributed in the water inlet distribution pipe 31,
It is divided into a plurality of parts and reaches the water inlet water chamber 32.

The water distributed into the heat exchanger tube 21 from the water inlet water chamber 32 absorbs heat while moving up and down inside the heat exchanger tube 21, becomes steam, and then reaches the outlet steam chamber 33, where it enters the outlet steam distribution tube. 3
After passing through the inside of the steam pipe 4 and merging at the outlet steam header 35, the steam flows out from the outlet steam pipe 36 and reaches a turbine (not shown).

In addition, in the electromagnetic pump 18, the stator 38 applies a "linear movement J of the magnetic field to the anicolas space 37 containing the liquid metal, and the liquid metal This takes advantage of the fact that a driving force is generated.

As explained above, according to this embodiment, there is no need to install a mechanical pump for the secondary cooling system, which is required in conventional reactor cooling systems, resulting in a significant reduction in piping length. became possible. Furthermore, it is also possible to reduce the volume of 1-lium in the secondary cooling system, and therefore the capacity of the 1-lene tank, etc. can be reduced.

Furthermore, the number of rooms and space volume of the reactor building can be reduced by reducing the number of mechanical pumps, and the space volume of the reactor auxiliary building can be reduced by shortening the piping length.

[Effects of the Invention] According to the present invention, liquid metal cooling7. Type II reactor d month J
It has become possible to reduce the number of cold N1 devices in the secondary cooling system, that is, to reduce the number of mechanical pumps, which has made it possible to shorten the piping length, and further reduce the drain tank capacity and reduce the number of mechanical pumps. This has the remarkable effect of making it possible to reduce the space volume of the reactor building and reactor auxiliary building.

[Brief explanation of drawings]

Fig. 1 is a liquid metal cooled port according to an embodiment of the present invention; a schematic diagram of the secondary cooling system of the sub-reactor; Fig. 2 is a vertical sectional view of the steam generator shown in Fig. 1; Fig. 3 is a conventional liquid metal cooled nuclear reactor 2
It is a schematic diagram of a secondary cooling system. DESCRIPTION OF SYMBOLS 10... Reactor vessel, 11... Core 12... Primary main circulation pump 13... Intermediate heat exchanger 14... Roof slab, 16... Piping 17... Steam generator, 18
...Electromagnetic pump 19...Main body shell, 21...Heat transfer tube 24...Liquid metal inlet header 26...Liquid metal outlet riser pipe

Claims (2)

[Claims] (1) In a secondary cooling system for a liquid metal cooled reactor, which is configured by piping connecting an intermediate heat exchanger disposed inside the reactor vessel and a steam generator disposed outside the reactor vessel, the steam A liquid metal inlet distribution pipe is provided in the upper part of the main body of the generator, and a liquid metal outlet rising pipe is provided approximately in the center of the main body of the steam generator, and an electromagnetic pump is disposed inside the outlet rising pipe. A cooling device for a liquid metal cooled nuclear reactor, characterized in that the steam generator is configured to have a liquid level inside the body shell of the steam generator. (2) The liquid metal cooled nuclear reactor according to claim 1, wherein the electromagnetic pump has a stator spirally wound around a coated cable and a cylindrical external iron core disposed outside the stator. Cooling system.