JPH0795109B2 - Reactor structure of fast breeder reactor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a reactor structure of a tank type fast breeder reactor, and more particularly to a technology capable of providing a small and economical reactor structure.

[Conventional technology]

As one of the conventional techniques close to the present invention, there is one disclosed in JP-A-60-57289. This example is shown in FIG.

In FIG. 6, the core 44 and the primary coolant 4 are placed in the primary container 35.
2, Primary cooling system circulation pump for forced circulation of primary coolant 42
38 and an intermediate heat exchanger 40 for exchanging heat between the primary coolant 42 and the secondary coolant 43. Further, a secondary container 36 is installed outside the primary container 35 and is hung from a roof slab 37 like the primary container 35. A secondary cooling system circulation pump 39 and a steam generator are provided between the primary container 35 and the secondary container 36.
41 and 41, and a secondary coolant 43 is filled between them.
Then, many long pipes 45, 4 are provided between the pump 39 and the intermediate heat exchanger 40 and between the intermediate heat exchanger 40 and the steam generator 41.
Connected at 6.

According to this conventional example, the steam generation system and the secondary cooling system of the fast breeder reactor are closely integrated around the primary cooling system to form a highly intensive reactor. However, the configuration in the primary container 35 including the primary cooling system is, as described above, configured such that the primary cooling system circulation pump 38 and the intermediate heat exchanger 40 are alternately arranged along the inner wall of the primary container. As a result, the integration did not extend into the primary container.

Further, as one of the conventional techniques close to the present invention, Japanese Patent Laid-Open No. 61-
There is one disclosed in Japanese Patent No. 54495. An example of this is shown in FIGS. 7 and 8.

7 and 8, when the secondary coolant in the secondary cooling system 55 is circulated by the pumping force of the secondary coolant circulating pump 52, the secondary coolant in the secondary cooling system 55 is pipe 53a. Enters the inlet Hedsah pipe 53, splits and flows into each inlet pipe 54,
Ascends in the secondary cooling flow path 70 along the heat transfer plate and
It flows out to 56, merges in the outlet header pipe 57, is sent to the steam generator 58 through the pipe 57a, is sucked by the pump 52 again, and circulates. When the circulation of the secondary cooling material in the secondary cooling system 55 occurs, the secondary cooling material of the secondary cooling system 55 becomes the secondary cooling system flow path 70.
When ascending, the interaction between the magnetic fields of the inner and outer magnets 65, 66 and the induced annular electromotive force 71 in the primary coolant in the primary cooling system channel 69 induces a downward flow force. . Therefore, the primary coolant in the upper plenum 59 in the main container 51 flows downward from the inlet 60 of the electromagnetic flow coupler type intermediate heat exchanger 64 in the primary cooling system flow passage 69 and in the primary coolant outlet pipe 61. Is discharged into the high pressure plenum chamber 62 through the core 63
Is heated and returned to the upper plenum 59. When the primary coolant in the main container 51 and the secondary coolant in the secondary cooling system 55 are in contact with the heat transfer plate 68 and flow in opposite directions, the heat transfer plate 68 causes the main coolant inside the main container 51 to flow. From primary coolant to secondary cooling system
The secondary coolant within 55 receives the heat and transports it to the steam generator 58.

In this conventional example, an annular electromagnetic flow coupler type intermediate heat exchanger 64 is arranged in the upper plenum 59, and the heat exchange action between the primary coolant and the secondary coolant and the non-mechanical pump action are provided in the same device. This was achieved, and by removing the mechanical primary coolant circulation pump, it became an integrated reactor for the primary cooling system.

However, the structure of the secondary coolant is such that the secondary coolant circulation pump and the steam generator are arranged outside the reactor, and the integration has not been extended to the secondary cooling system.

From the viewpoint of the present invention, the basic principle of the operation of an electromagnetic flow coupler having a heat transfer surface is described in Japanese Patent Laid-Open No.
-29688.

[Problems to be solved by the invention]

The prior art described above does not consider the point of simultaneous integration of the primary cooling system and the secondary cooling system, and further integration is desired.

An object of the present invention is to provide a simpler nuclear reactor plant that is more integrated than before.

[Means for solving problems]

The basic configuration of the present invention is that a primary coolant in a reactor vessel including a core, a secondary coolant driven by a pump and passing through a steam generator, and an electromagnetic wave that performs heat exchange between the two coolants. In a fast breeder reactor comprising a flow coupler type intermediate heat exchanger, the electromagnetic flow coupler type intermediate heat exchanger provided in the reactor vessel in an arrangement surrounding the core and the primary coolant, and the electromagnetic flow. The reactor vessel including a coupler type intermediate heat exchanger and the secondary coolant around the outer periphery thereof, the pump for the secondary coolant contained in the secondary coolant in the reactor vessel, and the Primary cooling material inlet hole through a steam generator, the electromagnetic flow coupler type intermediate heat exchanger, a primary flow path, and a hot plenum above the core, and primary cooling through the primary flow path and a cold plenum below the core Material exit hole and A secondary coolant inlet hole connected to the secondary flow path of the electromagnetic flow coupler type intermediate heat exchanger and passing through the discharge secondary coolant of the pump, and a secondary coolant connected to the secondary flow path to the steam generator. It is a reactor structure of a fast breeder reactor characterized by comprising a secondary coolant outlet hole through which a material is discharged.

[Action]

In the above configuration, when the secondary coolant is put into the steam generator through the secondary flow path of the electromagnetic flow coupler by the circulation pump and then returned from the steam generator into the container, the function of the electromagnetic flow coupler causes the flow inside the primary flow path. It is possible to apply a flow force to the primary coolant, and even if there is no circulation pump for the primary coolant flow, the flow from the primary coolant cold plenum to the hot plenum through the core and from the hot plenum to the cold plenum through the primary flow path Can be established. Further, the heat transfer wall of the electromagnetic flow coupler is used to perform heat exchange between the primary and secondary fluids, and the heat of the core can be taken out to the steam generator by the secondary coolant.

Furthermore, when the flow path of the secondary coolant is configured as described above,
Since it is not necessary to use pipes or use them for a long time, the reactor structure can be downsized. Furthermore, by making the heat transfer wall of the electromagnetic flow coupler the boundary of the separating partition wall of the secondary coolant of the primary coolant, the primary vessel can be eliminated, which contributes to downsizing of the reactor structure.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, 4, and 5.

As shown in the longitudinal sectional view of the nuclear reactor of FIG. 1, the electromagnetic flow coupler 5 is installed in such a manner as to surround the outer periphery of the core 1. In the electromagnetic flow coupler type intermediate heat exchanger 5 provided with the magnets 6 in the upper and lower stages, liquid metal sodium is put in as a primary coolant. The primary coolant is divided by a horizontal partition 28 into an upper hot plenum 11 and a lower cold plenum 10. The space between the liquid surface 29 of the primary coolant and the roof slab 4 in the electromagnetic flow coupler type intermediate heat exchanger 5 is filled with an inert primary cover gas 31.

An electromagnetic flow coupler 5 including a core 1 inside is contained in a reactor vessel 2 in a guard bet cell 3, and this reactor vessel 2 is fixed to a roof slab 4 at an upper portion thereof. A heat shield 67 is fixed to the lower surface of the roof slab 4.

A secondary coolant is placed in the gap between the electromagnetic flow coupler type intermediate heat exchanger 5 and the reactor vessel 2. The secondary coolant is divided into three regions by a partition plate, that is, an inlet tank 19 of the steam generator 7, an inlet plenum 20 of the circulation pump 8 and an outlet plenum 14 of the circulation pump 8. The space between the liquid surface 30 of the secondary coolant and the roof slab 4 is also filled with an inert secondary cover gas 32.

In addition, between the electromagnetic flow coupler 5 and the reactor vessel 2, a circulation pump 8 that applies a fluid force to the secondary coolant, and a steam generator 7 that performs heat exchange between the secondary coolant and water. Is suspended and supported from the roof slab 4. The reactor vessel 2, the circulation pump 8 and the steam generator 7 are arranged in the second plane.
It is as shown in the figure.

The electromagnetic flow coupler 5 will be described with reference to FIG.

A plurality of heat transfer walls 24 form an annular flow path space surrounded by an inner peripheral wall 23 and an outer peripheral wall 25, and primary flow paths 26 and secondary flow paths 27 are alternately formed.

Of both flow paths, the lower end opening of the primary flow path 26 is closed with a plate,
The primary coolant inlet hole 12 and the primary coolant outlet hole 13 communicate only with the primary coolant hot plenum 11 and the cold flenum 10 in the electromagnetic flow coupler 5 for the purpose of separating from the secondary coolant. On the other hand, the secondary flow path 27 is formed by the secondary coolant inlet hole 15 and the secondary coolant outlet hole 16 so that the secondary coolant circulation pump outlet plenum 14 and the secondary coolant steam generator inlet outside the electromagnetic flow coupler 5 are connected. It communicates with tank 19.

According to the fast breeder reactor having such a configuration, the following actions can be obtained.

That is, when the circulation pump 8 is operated, the secondary coolant discharged at high pressure causes the circulation pump outlet plenum as indicated by the solid black arrow.
The fluid flows from 14 through the secondary coolant inlet hole 15 into the secondary flow passage 27 and rises and flows in the secondary flow passage 27. Secondary coolant is the secondary flow path 27
When flowing upward, the secondary coolant crosses the magnetic field generated by the magnet 6. Therefore, an annular current is induced along both walls 23, 25 in an annular region surrounded by the inner peripheral wall 23 and the outer peripheral wall 25. When this current is received by the primary coolant in the primary flow path 26 under the environment of the vertical radial magnetic field on both walls 23, 25, the primary coolant is in the downward direction which is the direction opposite to the flow of the secondary coolant. It flows as shown by the arrow. These principles are established by Fleming's right-hand and left-hand rules.

When the primary coolant flows in the electromagnetic flow coupler 5 without a circulation pump, the primary coolant flows from the primary flow path 26 to the primary coolant outlet hole 13 as shown by the white thick arrow 21 in FIG. Through the cold plenum 10 to the core 1, heated in the core 1 and discharged into the hot plenum 11.
The circulation is repeated from the primary coolant inlet hole 12 into the primary flow path 26 again. The primary coolant heated by this circulation transfers heat to the secondary coolant flowing in the secondary flow path 27 through the heat transfer wall 25 while passing through the primary flow path 26.

The secondary coolant in the secondary flow path 27, which has become high temperature due to the heat transfer, is driven by the circulation pump 8 to generate a secondary coolant outlet hole 16
Flows out from the steam generator into the steam generator inlet tank, and is sucked into the steam generator 7. Then, it escapes from the lower part of the steam generator 7 to the circulation pump inlet plenum and is sucked into the circulation pump 8 again. The secondary coolant thus repeats circulation as indicated by the thick black arrow 22 in FIG.

During this circulation, in the steam generator 7 that has received the secondary coolant having a high temperature, heat of the secondary coolant is transferred to water, and the water is converted into steam. The steam thus produced from the nuclear reactor is sent to a steam turbine or the like that drives a generator and consumed as a power source.

Incidentally, FIG. 4 is a diagram showing an outline of the primary coolant inlet hole 12 and the secondary coolant outlet hole 16 above the inner peripheral wall 23 and the outer peripheral wall 25 for forming the primary flow passage 26 and the secondary flow passage 27. FIG. 5 is a horizontal conceptual view of the inlet structure of the secondary coolant to the steam generator 7.

These concretely show a flow path in which the secondary coolant flowing out from the secondary flow path 27 through the secondary coolant outlet hole 16 enters the steam generator 7 through the steam generator inlet tank 19. .

According to the embodiment described above, the circulation of the primary coolant and the secondary coolant can be performed with almost no use of piping, so that there is an effect that the reactor vessel can be downsized.

Further, since the piping inside the reactor vessel can be deleted, the boundary between the primary cooling system and the secondary cooling system can be reduced, and the safety inside the reactor can be improved.

Furthermore, since the piping inside the reactor is deleted, the circulation pump head can be reduced, which can also contribute to downsizing of the reactor vessel.

Further, by making the heat transfer wall of the electromagnetic flow coupler the boundary of the partition wall separating the primary coolant and the secondary coolant, the primary vessel can be eliminated, which contributes to downsizing of the reactor structure.

〔The invention's effect〕

According to the present invention, since the heat transfer surface wall of the electromagnetic flow coupler is used as an isolation boundary between the primary coolant and the secondary cooling, the primary container intended only for the isolation of the primary coolant and the secondary coolant can be deleted. The furnace structure can be downsized.

In addition, since the flow path of the secondary coolant can be formed without using any pipes or using many pipes, the reactor structure can be downsized.

As described above, it is possible to achieve a further integrated reactor structure of a fast breeder reactor.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a reactor according to an embodiment of the present invention, FIG. 2 is a conceptual view of a horizontal arrangement of a circulation pump of a steam generator shown in FIG. 1, and FIG. 3 is A of FIG. -A schematic view of section A,
FIG. 4 is a bird's-eye view in partial cross-section showing an outline of the upper structure of the electromagnetic flow coupler type intermediate heat exchanger of FIG. 1, FIG. 5 is a horizontal schematic view showing the sodium inlet of the steam generator, and FIG. 6 is FIG. 7 is a skeleton view showing a cross section of a conventional centralized reactor, and FIG. 7 is a skeleton diagram showing a cross section of a conventional nuclear flow reactor type intermediate heat exchanger.
The drawing is a cross-sectional view showing only half of the BB cross section of FIG. 7. 1 ... Core, 2 ... Reactor vessel, 3 ... Electromagnetic flow coupler type intermediate heat exchanger, 7 ... Steam generator, 8 ... Drive pump, 10 ... Cold plenum, 11 ... Hot plenum,
12 …… Primary coolant inlet hole, 13 …… Primary coolant outlet hole, 15
…… Secondary coolant inlet hole, 16 …… Secondary coolant outlet hole, 18…
… Steam generator inlet nozzle, 21 …… Primary coolant flow, 22
...... Secondary coolant flow.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location G21C 15/14 (72) Inventor Yoji Shibata 3-1-1, Saiwaicho, Hitachi, Ibaraki Stock Association Company Hitachi, Ltd. Hitachi factory (72) Inventor Tatsuo Amada 3-1-1, Saiwaicho, Hitachi-shi, Ibaraki Hitachi Ltd. Hitachi factory (72) Inventor Noboru Nakao 3-1-1, Saiwaicho, Hitachi, Ibaraki No. 1 Stock company Hitachi Ltd. Hitachi factory (72) Inventor Sadao Hattori 1-6-1, Otemachi, Chiyoda-ku, Tokyo Inside Central Research Institute of Electric Power Industry (56) Reference Japanese Patent Publication No. 5-79156 (JP, B2)

Claims (1)

[Claims] 1. A primary coolant in a reactor vessel containing a core, a secondary coolant driven by a pump and passing through a steam generator, and an electromagnetic flow coupler for heat exchange between the two coolants. -Type intermediate heat exchanger in a fast breeder reactor, the electromagnetic flow coupler type intermediate heat exchanger provided in the reactor vessel in an arrangement surrounding the core and the primary coolant, and the electromagnetic flow coupler type The reactor vessel including an intermediate heat exchanger and the secondary coolant around the periphery thereof, the pump of the secondary coolant contained in the secondary coolant in the reactor vessel, and the steam generation. Reactor, a primary coolant inlet hole through the electromagnetic flow coupler type intermediate heat exchanger and the hot plenum above the core, and a primary coolant outlet through the primary flow passage and the cold plenum below the core Holes and the electromagnetic flow A secondary coolant inlet hole which is connected to the secondary flow path of the plastic intermediate heat exchanger and through which the discharge secondary coolant of the pump is passed, and a secondary coolant flow path which is connected to the secondary flow path and outputs the secondary coolant to the steam generator A reactor structure of a fast breeder reactor characterized by comprising a secondary coolant outlet hole.