JPH0795110B2 - Fast breeder reactor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a reactor structure of a fast breeder reactor, and particularly to an electromagnetic flow coupler pump suitable for providing a small and economical reactor structure. Of the fast breeder reactor.

[Conventional technology]

As an example of the prior art close to the present invention, there is one disclosed in JP-A-60-57289.

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 structure in the primary container including the primary cooling system is as described above.
The primary cooling system circulation pump and the intermediate heat exchanger are arranged so as to be arranged differently from each other along the inner wall of the primary container,
The integration did not extend into the primary container.

Further, as another example of the prior art close to the present invention, there is one disclosed in JP-A-61-54495.

In this conventional example, an annular electromagnetic flow coupler pump type intermediate heat exchanger is arranged in the upper plenum, and the heat exchange action between the primary coolant and the secondary coolant and the non-mechanical pump action are made into the same device. This was achieved, and the removal of the mechanical primary coolant circulation pump has made it a centralized reactor for primary coolant.

However, the structure of the secondary cooling system 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.

As a patent related to the present invention, the basic function of an electromagnetic flow coupler pump having a heat transfer surface is disclosed in JP-A-61-2968.
It is shown in No. 8.

[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.

It is an object of the present invention to provide a simpler fast breeder reactor that is more integrated than conventional ones.

[Means for solving problems]

Means for achieving the above-mentioned object, a core of a nuclear reactor and a main container containing primary and secondary coolants, a core provided in the lower part of the core in communication with the core in the main container A lower plenum, an annular electromagnetic flow coupler pump arranged so as to communicate with the core lower plenum in the main vessel so as to surround the core, and communicate in series with the electromagnetic flow coupler pump in the main vessel. A primary coolant boundary is formed with an intermediate heat exchanger annularly arranged so as to surround the core, and in the main container, the primary coolant is from the primary coolant boundary to the primary coolant of the intermediate heat exchanger. Forming a circulation channel of the primary coolant that circulates through the primary coolant channel through the core lower plenum through the primary coolant channel through the electromagnetic flow coupler pump, A secondary circulation pump and a steam generator are provided between the primary coolant boundary and the inner wall of the main container, and the secondary circulation pump passes through the secondary coolant flow path of the electromagnetic flow coupler pump to form the intermediate It is a fast breeder reactor formed by forming a circulation passage of a secondary coolant that passes through a secondary coolant passage of a heat exchanger, passes through the steam generator, and circulates to the secondary circulation pump.

[Action]

According to the above means, in the same main container, the core lower plenum, the annular electromagnetic flow coupler pump, and the intermediate heat exchanger to form the primary coolant boundary without adopting a new container, Isolation of the primary and secondary coolant is achieved.

The secondary coolant outside the primary coolant boundary is flowed by the secondary circulation pump into the secondary coolant flow path of the electromagnetic flow coupler pump, and then into the secondary coolant flow path of the intermediate heat exchanger. It enters, where it exchanges heat with the primary coolant. The secondary coolant that has undergone heat exchange in the intermediate heat exchanger exits from the intermediate heat exchanger, enters the steam generator, and supplies heat for steam generation, and then exits from the steam generator and recirculates again. It is sucked in by the next circulation pump and forcedly circulates in the same route.

On the other hand, the primary coolant in the primary coolant boundary flows from the electromagnetic flow coupler pump when the secondary coolant flows in the electromagnetic flow coupler pump because of the principle of the electromagnetic flow coupler. It is fed into the lower core plenum, from there it is fed into the core, heated by the core, and discharged upward from the core. The primary coolant heated in the core performs heat exchange action with the secondary coolant while passing through the flow path of the primary coolant of the intermediate heat exchanger, and from the intermediate heat exchanger to the electromagnetic flow coupler pump. It follows the circulation path of returning to the flow path of the primary coolant.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a bird cage diagram of a fast breeder reactor according to the present invention.
An annular electromagnetic flow coupler pump 5 is installed so as to surround the outer periphery of the core 1, and an annular intermediate heat exchanger 3 structurally connected to the annular electromagnetic flow coupler pump 5 is installed on the annular electromagnetic flow coupler pump 5. These devices have an integral structure together with the reactor core, and this integral structure is housed in the main container 7. The main container 7 and the gear cup of this integrated structure,
Four secondary circulation pumps 11 and four steam generating groups 9 are installed alternately.

FIG. 2 is a longitudinal sectional view of the nuclear reactor structure shown in FIG. 1, and the flow of the coolant will be described with reference to this figure. The primary coolant that has flowed from the lower core plenum 12 into the core 1 and is heated flows from the hot plenum 13 into the primary side of the annular intermediate heat exchanger 3, descends the heat transfer section and flows out from the outlet, and then the annular electromagnetic It flows from the primary side inlet provided on the inner wall of the flow coupler pump 5 into the primary flow path in the pump. The primary coolant is given a driving force by the electromagnetic force of the flow coupler and flows into the lower core plenum 12 again to form a primary coolant flow path. Further, the secondary coolant is discharged to the lower part of the secondary system plenum partition 14 by the driving force of the secondary circulation pump 11, and from the secondary side inlet provided on the lower outer wall of the annular electromagnetic flow coupler pump 5. It flows into the secondary passage in the pump and rises. The secondary coolant flowing out from the annular electromagnetic flow coupler 5 flows into the secondary flow path of the annular intermediate heat exchanger 3,
It rises while exchanging heat with the primary coolant, flows out to the upper part of the tube sheet, and then flows into the steam generator 9 through the steam generator inlet. The secondary coolant that has exchanged heat with water / steam in the steam generator 9 flows out to the upper part of the secondary system plenum partition 14 and is circulated again by the secondary circulation pump 11.

FIG. 3 is a vertical sectional view showing details of the annular electromagnetic flow coupler pump 5 and the annular medium heat exchanger 3.

A ring-shaped electromagnetic flow coupler pump 5 and a ring-shaped intermediate heat exchanger 3 are installed around a core barrel 20 surrounding the core, and these structures are welded to a core support plate 21 together with a core (not shown) to form an integrated structure. Become. Annular electromagnetic flow coupler pump 5
Is composed of an outer core 22, an inner core 23, a coil 24, an inner wall 25 for forming a flow path, an outer wall 26, and a partition wall (not shown) for separating the primary coolant and the secondary coolant. Outer wall 26
Is connected to the outer wall 28 of the annular intermediate heat exchanger 3 via the plenum 27. The annular intermediate heat exchanger 3 is a straight tube heat exchanger,
The secondary coolant flows inside the heat transfer tube.

In this figure, the primary coolant heated in the core flows in from the intermediate heat exchanger primary side inlet 31 provided at the top of the core barrel 20 as shown by the white arrow 29, while being removed by the secondary coolant. It descends outside the heat transfer tube. This primary coolant flows into the primary flow passage in the pump from the pump primary side inlet 32 provided in the upper part of the inner wall 26 of the annular electromagnetic flow coupler pump, and after being given a driving force, discharged to the core lower plenum 12. To be done.

In addition, the secondary coolant is discharged from the secondary circulation pump as shown by the black-painted arrow 30, and then from the pump secondary side inlet 33 provided in the lower portion of the annular electromagnetic flow coupler pump outer wall 25 to the inside of the pump. After flowing into the next flow path and rising, it flows into the inside of the heat transfer tube of the annular intermediate heat exchanger 3 via the plenum 27. After that, the secondary coolant heated by the primary coolant while rising in the pipe flows out from the upper tube sheet 34 and is then carried to a steam generator (not shown).

FIG. 4 is a bird's eye view of the annular electromagnetic flow coupler pump body. In this figure, the same parts as those in FIG. 3 are indicated by the same numbers. When the secondary coolant driven by the secondary circulation pump rises every other one in the flow duct 19 partitioned by the partition wall 18, as shown by a black arrow 30, the outer core 22 Then, by the electromagnetic force induced by the inner core 23 and the coil 24, the primary coolant in the adjacent flow ducts is driven downward as indicated by the white arrow 29. The pump primary side inlet 32 and the pump secondary side inlet 33 are, as shown,
Every other flow duct is provided.

According to the structure and the flow of the coolant described above,
The primary coolant boundary of this plant is as shown by the thick broken line in Fig. 5.

According to the embodiment described above, the circulation of the primary coolant and the secondary coolant can be performed without using any pipes, so that there is an effect that the reactor structure can be downsized.

Furthermore, the primary vessel can be eliminated by using the flow channel wall of the annular electromagnetic flow coupler pump, the wall of the annular intermediate heat exchanger, and the core lower plenum wall as the primary coolant boundary, thus reducing the size of the reactor structure. Can contribute to.

〔The invention's effect〕

According to the present invention, the flow path length of the core → heat exchanger → pump → core can be minimized, and the primary coolant and the secondary coolant are the flow passage walls and heat of the annular electromagnetic flow coupler pump. Eliminates the primary vessel, which is isolated only by the primary and secondary coolants found in traditional dual tank reactors, as it is isolated by the walls of the exchanger and the lower plenum wall Therefore, the reactor structure can be downsized.

Further, since the flow path of the secondary coolant can be formed without using piping, the reactor structure can be further downsized.

As described above, it is possible to achieve a reactor structure of a fast breeder reactor that is more integrated than in the past.

[Brief description of drawings]

FIG. 1 is a bird's-eye view of a fast breeder reactor which is an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of FIG. 1, and FIG. 3 is an annular electromagnetic flow coupler pump and an annular intermediate heat exchanger of FIG. FIG. 4 is a vertical sectional view showing the details of FIG. 4, FIG. 4 is a bird's-eye view of the annular electromagnetic flow coupler pump body, and FIG. 5 is a primary coolant boundary diagram of the embodiment. 3 ... Annular intermediate heat exchanger, 5 ... Annular electromagnetic flow coupler pump, 18 ... Partition wall, 19 ... Flow duct, 32 ... Pump primary side inlet, 33 ... Pump secondary side inlet.

─────────────────────────────────────────────────── ─── 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 Takeshi Nitawaki 3-1-1, Saiwaicho, Hitachi-shi, Ibaraki Stock company Hitachi, Ltd. Hitachi factory (72) Inventor Takashi Ikeda 1168 Moriyama-cho, Hitachi-shi, Ibaraki (56) References Japanese Patent Publication No. 63-95389 (JP, A) Japanese Patent Publication No. 5-79156 (JP, B2)

Claims (1)

[Claims] 1. A lower core plenum, which is arranged in a lower part of the core in communication with the core in a main container containing a reactor core and primary and secondary coolants, An annular electromagnetic flow coupler pump arranged so as to communicate with the lower core plenum in the main container so as to surround the core, and to communicate in series with the electromagnetic flow coupler pump in the main container to surround the core. Forming a primary coolant boundary with the intermediate heat exchanger annularly arranged in the main container, the primary coolant from the primary coolant boundary through the primary coolant flow path of the intermediate heat exchanger A primary coolant circulation channel is formed that circulates through the primary coolant channel of the electromagnetic flow coupler pump, through the core lower plenum, through the core and into the primary coolant boundary, and the primary coolant bounce is formed. A secondary circulation pump and a steam generator are provided between the secondary wall and the inner wall of the main container, and from the secondary circulation pump through the secondary coolant flow path of the electromagnetic flow coupler pump of the intermediate heat exchanger. A fast breeder reactor formed by forming a circulation flow passage for a secondary coolant that passes through a secondary coolant passage, passes through the steam generator, and circulates to the secondary circulation pump.