Reactor with pressure water cooling

FIELD: power industry.

SUBSTANCE: invention relates to internals of a reactor with pressure water cooling. The reactor includes high-pressure cylindrical housing (1) with inlet branch pipes connected to it; fuel assemblies installed inside high-pressure housing (1); cylindrical core barrel (3) enveloping the fuel assemblies and forming annular downcomer (6) between core barrel (3) and the inner surface of high-pressure housing (1); and radial supports. Radial supports represent supports installed under downcomer (6) at some distance from each other in a circumferential direction, in each of which there is a vertical heat carrier passage duct formed inside it, by means of which positioning of core barrel (3) and high-pressure housing (1) is performed. For example each radial support can have radial key (21) with the heat carrier passage duct and element (40) with a key groove.

EFFECT: uniform distribution of a heat carrier flow in a circumferential direction.

5 cl, 6 dwg

 

The scope of the invention

The object of this invention is a nuclear reactor cooled by water under pressure.

The level of technology

In a nuclear reactor cooled by water under pressure supplied to the reactor the primary coolant is heated by heat energy from fuel assemblies of the reactor and then enters the steam generator. In the steam generator heated by the primary coolant and the secondary coolant undergoes heat exchange process and the vapor emitted by the boiling point of the coolant of the second circuit, is fed to a turbine to generate electricity.

Fig.6 schematically shows a vertical sectional view of a conventional reactor cooled by water under pressure. The high-pressure reservoir 1 of the reactor, essentially, is a cylindrical vessel with a vertical longitudinal axis. The high-pressure reservoir 1 reactor has inlets 4 through which flows the primary coolant, and outlet 5, through which the heated coolant. Inside of the pressure vessel 1 of the reactor are a large number of fuel assemblies 2, a cylindrical basket 3 active zone surrounding the fuel assemblies 2, and the lower support plate 8 of the core, supportive�sort of fuel assemblies 2. Between the high pressure casing 1 and 3 basket active zone are provided with an annular surge chamber 5 nuclear reactor. In the lower part of the movable chamber 6 nuclear reactor installed radial pins 9 to provide support in radial directions of the pressure vessel 1.

The primary coolant enters the pressure housing 1 of a nuclear reactor on the input pipe 4 and flows down into the surge chamber 6. Flushed the coolant collected in the lower Plenum 7 that is installed under the fuel assemblies 2. Then flushed the coolant system is rotated 180° and goes up through the lower support plate 8 reactor core and the fuel assemblies 2 in the basket 3 of the active zone. The primary coolant heated in the fuel assemblies 2, reaches the upper part of the pressure vessel 1 of the reactor, stirred and flows out through outlet 5, and then enters the steam generator (not shown).

In such a reactor cooled by water under pressure in the case, if you are in normal mode, the flow or pressure of the primary coolant becomes unevenly distributed, the fuel assemblies 2 are cooled unevenly. Thus, it is important to ensure an evenly distributed flow of primary coolant to the�lovejesus assemblies 2.

In order to make uniform around the circumference of the coolant flow entering through the inlet nozzles, offered to install intersticialny element in a streamlined shape in the surge chamber and do radial bearings (radial tabs) streamlined shape (see patent document 1).

The patent document 1. Publication laid patent application of Japan No. 2005-24383.

The essence of the invention

As mentioned above, there is known a configuration in which the flow of primary coolant flowing down the downcomer chamber, was proposed to be done evenly distributed to ensure uniform distribution of flow of the primary coolant passing through the fuel assemblies of a nuclear reactor. However, the conventional method in which in the surge chamber set intersticialny item or give a streamlined shape radial supports, indeed, able to eliminate flow separation in the local area, but are unable to make the flow of primary coolant is evenly distributed around the circumference of the movable camera.

The present invention is proposed to solve the foregoing problems; the objective is to create an in-core device that can make the flow of the primary coolant flowing down in the surge chamber, RA�dimensional distributed over the circumference, and to provide an evenly distributed flow of primary coolant to fuel assemblies.

To solve this problem is proposed reactor cooled by water under pressure, comprising: a cylindrical pressure housing with a vertically oriented axis having a certain number of inlets on the side surface; a plurality of fuel assemblies arranged in the housing of a high pressure reactor; a cylindrical basket of the active zone with a vertical axis, surrounding the specified set of fuel assemblies, and an annular surge chamber between the cylindrical basket of the active zone and the inner side surface of the pressure vessel; and also a certain amount of radial bearings spaced from each other in the circumferential direction, are installed in the surge chamber near the inlet nozzles, to accommodate basket reactor core and the pressure vessel so as to form a vertical channel for the passage of coolant flow through each specified radial support.

The present invention can provide a uniform distribution around the circumference of the flow of primary coolant, as well as an evenly distributed flow of the primary coolant flowing to the heat�delaysin assemblies.

Brief description of the drawings

Fig.1 shows a horizontal sectional view showing the core device of a nuclear reactor cooled by water under pressure according to the first embodiment of the present invention.

Fig.2 shows a vertical section along the line II-II in Fig.1 (in the direction of the arrows illustrating the configuration installed in the coolant flow radial dowels in accordance with the first embodiment of the invention.

Fig.3 shows a horizontal section showing the core device according to the second embodiment of the implementation.

Fig.4 shows a vertical section along the line IV-IV in Fig.3 (in the direction of the arrow).

Fig.5 shows a horizontal section showing a modification of the core device according to the second embodiment of the implementation.

Fig.6 schematically shows a vertical sectional view of a conventional reactor cooled by water under pressure.

Embodiments of the invention

The following is a description of embodiments of the reactor with cooling water under pressure according to the present invention with reference to the accompanying drawings.

The first variant of implementation

The first variant implementation of the present invention is described with reference to Fig.1 and 2.

One and t� same or similar elements (elements, similar to that used in conventional in-core device) designated by the same numbers, and repeated description of such elements is omitted.

In this embodiment, the implementation as radial bearings are radial keys 21 with the channel for the passage of coolant and the elements 40 with keyways. Within each of the radial pins 21 channel 22 is provided for the passage of coolant.

Four radial pins 21 with a channel for passing coolant installed on the outside of the basket 3 of the active zone in its lower part to separate them from each other circumferentially. Each of the radial pins 21 with a channel for passage of coolant has a projection of a certain height. Each of the elements 40 with keyways installed in the position in which it is opposite one of the radial pins 21 with the channel for the passage of coolant. Each of the elements 40 with keyways 40 has a vertically positioned keyway groove 41. The shape of each of the radial protrusions of the pins 21 with a channel for passing coolant conforms to the shape of one of the keyed grooves 41 that is made to allow the installation of the basket 3 of the active zone in the pressure housing 1.

In the center of each radial keys 21 is formed with a channel 22 for prochoiceamerica, through which the heat medium passes vertically upwards.

The design of all other elements is similar to the design of a conventional variant of the reactor described above (see Fig.6).

In this embodiment, the basket 3 of the active zone is placed in position with a gap relative to the pressure vessel 1 of the reactor by means of a radial keys 21 with the channel for the passage of coolant and elements 40 with keyways. Thread 12 of the primary coolant flowing down in the surge chamber 6, while passing through the radial keys 21 with a channel for passage of the coolant is divided into left and right streams. In addition, part of the flow of the primary coolant passes through the channels 22 formed in the Central part of the radial keys 21. This prevents separation of the coolant flow, which can occur when the fluid passes through the radial keys 21 with the channel for the passage of coolant. As a result, it becomes possible to prevent a local decrease of the flow rate of the coolant supplied to the fuel assemblies 2 are disposed at a radial keys 21 with the channel for the passage of coolant.

Although in this embodiment of the radial keys 21 with a channel for passage of heat�of osites installed in four places around the circumference, if necessary, the amount of data of radial keys 21 can be increased or decreased. Further, although in the above described embodiment of the channels 22 for the passage of coolant is made in the lateral elements of the basket 3 of the active zone, the channels 22 for the passage of coolant can be made in the components of the pressure vessel 1, and simultaneously in the lateral elements of the basket 3 of the active zone and lateral components of the pressure vessel 1.

In addition, in the present method the implementation of the radial keys 21 with a channel for passing coolant installed from the outside of the basket 3 of the active zone, and the elements 40 with keyways installed inside the pressure vessel 1. However, the elements 40 with keyways can be installed, on the contrary, from the outside of the basket 3 of the active zone, and radial keys 21 with a channel for passing coolant can be installed inside the pressure vessel 1 of the reactor.

The second variant of implementation

The second variant implementation of the present invention shown in Fig.3-5. The same or similar elements (elements similar to those used in the first embodiment) are denoted by the same numbers of positions, and repeated description of such elements is omitted.

In the second embodiment is p�effect instead of radial bearings, containing radial keys 21 with the channel for the passage of coolant and the elements 40 with keyways, each radial bearing 23 comprises two magnetic elements 24 and 25. Each radial bearing 23 includes a magnetic element 24 attached to the basket 3 of the core, and the magnetic member 25 fixed to the pressure housing 1 of the reactor opposite the magnetic member 24. Several radial bearings 23 are arranged around the circumference of the basket 3 of the active zone. Magnetic elements 24 and 25 located opposite each other, are magnetized so that they are attracted to each other or repelled from each other.

Between the magnetic elements 24 and 25 are formed channels 26 for the passage of coolant. As shown in Fig.4, with the aim of reducing the hydrodynamic resistance of the flow of the coolant on the lower and upper vertical portions of the magnetic elements 24 and 25 can be made bevels 27.

In a variant implementation with this configuration, the basket 3 of the active zone set in the desired position in the radial direction with the strength of the electromagnetic interaction, the magnetic elements to each other (or repelling each other) in a contactless manner. Positioning a non-contact method allows to increase the clearance of channels 26 for the passage of coolant and �to bespecial the same cross-sectional data channels on the circumference, what prevents the likelihood of local reduction of the flow rate of the coolant.

Although in this embodiment, the implementation uses four radial bearings 23, the number of radial bearings can be arbitrarily changed. For example, in the modification shown in Fig.5, a large number of radial bearings 23 are distributed around the entire circumference of the basket 3 of the active zone.

Other options for carrying out the invention

Despite the fact that these are preferred embodiments of the invention, they are illustrative and do not limit the scope of the present invention. Data with the novelty of the options for implementation may be implemented in various other forms, with the exception of the various elements, in various combinations, with various substitutions and modifications without departing from the scope of the invention. Implementation options and modifications of the present invention are covered by the scope or essence of the present invention and defined by the attached claims and their equivalents.

For example, the distinctive features of the respective embodiments can be combined in one reactor cooled by water under pressure.

The position numbers

1: Body high pressure reactor

2: Fuel collection�and

3: Basket active zones

4: Inlet

5: outlet;

6: drop camera

7: Lower Plenum

8: the lower base plate of the active zone

9: Radial dowel

21: Radial key with a channel for passing coolant

22: a Channel for passing coolant

23: Radial bearing

24, 25: Magnetic

26: a Channel for passing coolant

27: Bevel

40: the Element with keyway

41: Keyway

1. The reactor is cooled with water under pressure containing
a cylindrical pressure housing with a vertically oriented axis on the lateral surface of which there are several of inlets,
many fuel assemblies installed in the pressure housing,
cylindrical basket active zone with a vertical longitudinal axis, covering many fuel assemblies, wherein between the cylindrical basket of the active zone and the inner side surface of the pressure vessel is an annular surge chamber, and
several radial bearings spaced from each other circumferentially in the surge chamber, under input connections for the positioning of the basket of the active zone and the pressure vessel,
each radial bearing includes
element in�rikaline oriented keyway, secured to the inner side surface of the pressure vessel or to the outer surface of the basket of the active zone,
a key having a vertically oriented channel for the passage of coolant and fixed to the inner side surface of the pressure vessel or to the outer surface of the basket of the active zone, which is not the anchor member with a vertically oriented keyway,
when this key is included in the element with vertically oriented keyway, contacting with the pin slot.

2. The reactor is cooled with water under pressure according to claim 1, characterized in that
elements with vertically oriented keyway is fixed to the inner surface of the pressure vessel and key speakers from the recycle bin the active zone and are at least partially in the keyway.

3. The reactor is cooled with water under pressure according to claim 1, characterized in that
elements with vertically oriented keyway fixed to the outer surface of the basket of the active zone, and dowels protrude from the inner side surface of the pressure vessel and includes at least partially in the keyway.

4. The reactor is cooled with water under pressure containing
a cylindrical pressure housing with a vertically oriented� axis, on the lateral surface of which there are several of inlets,
many fuel assemblies installed in the pressure housing,
cylindrical basket active zone with a vertical longitudinal axis, covering many fuel assemblies, wherein between the cylindrical basket of the active zone and the inner side surface of the pressure vessel is an annular surge chamber, and
several radial bearings spaced from each other circumferentially in the surge chamber near the inlet nozzles so that the basket of the active zone and the pressure housing were located with the formation in each of the radial bearings of a channel for passage of a coolant, in this case,
each radial bearing comprises a first magnetic element attached to the inner surface of the pressure vessel, and a second magnetic element attached to the outer surface of the basket of the active zone, so that the second magnetic element is located opposite the first magnetic element.

5. The reactor is cooled with water under pressure according to claim 4, characterized in that the radial bearing mounted around the entire circumference of the basket of the active zone.



 

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