KR101644061B1 - Reactor coolant pump and nuclear power plant having the same - Google Patents

Abstract

The present invention comprises: an impeller unit which is installed to be rotated, and circulates a first fluid which flows inside a nuclear reactor coolant system by rotation; a motor driving unit which receives electricity to rotate the impeller unit with the electricity, and provides driving power rotating the impeller unit by using the rotation; and a turbine driving unit which receives a part of steam generated in a steam generating device to rotate the impeller unit by using the steam, and provides the driving power to rotate the impeller unit by the rotation. A rotation shaft of the impeller unit is connected to one of the motor driving unit and the turbine driving unit to be rotated by one of the motor driving unit and the turbine driving unit, and receives the driving power.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a reactor coolant pump,

The present invention relates to a reactor coolant pump to which a motor drive system and a turbine drive system are applied in combination, and a nuclear power plant having the same.

A nuclear reactor is composed of a separate reactor (eg Korean PWR) where major equipment (steam generator, pressurizer, pump impeller, etc.) is installed outside the reactor (eg Korean PWR) , SMART reactor).

In addition, reactors are divided into active reactors (for example, commercial reactors: Korea) and passive reactors (for example, AP1000: USA), depending on how the safety system is implemented. An active reactor is a reactor that uses active equipment such as a pump operated by an electric power such as an emergency generator to drive the safety system. The passive reactor is operated by gravity or gas pressure to drive the safety system It is a reactor that uses passive devices.

Meanwhile, the reactor is provided with a reactor coolant pump for circulating the fluid inside the reactor coolant system. The reactor coolant pump is driven by a motor drive system and a turbine drive system.

First, in the motor drive method, the reactor coolant pump is driven by using the electricity generated through the turbine and the generator. There is no energy loss in the power generation process, and when the high-pressure steam is used, the miniaturization is easy. There is a fear that the function of the pump may be lost. In addition, when a large pump power is required, the size and capacity of the motor increase together, which makes it difficult to miniaturize the reactor coolant pump and increases the structural load.

Next, the turbine driving method is a method using steam energy and has a disadvantage that it can not perform its function before steam is formed in the steam generator. As a result, the turbine drive system is disadvantageous in that it is difficult to adequately cope with various points in time required for operation of the reactor coolant pump, such as startup or cooling operation.

Therefore, in realizing the reactor coolant pump installed in the nuclear power plant, it is possible to consider the disadvantages of the conventional motor drive system and the turbine drive system.

1. Japanese Unexamined Patent Application Publication No. 11-295470 (October 29, 1999) 2. Korean Patent Registration No. 10-1513139 (April 17, 2015).

The present invention provides a reactor coolant pump driven by a combination of a motor drive system and a turbine drive system, and a nuclear power plant having the same.

According to an aspect of the present invention, there is provided a nuclear reactor coolant pump including: an impeller portion formed to be rotatable and adapted to circulate a primary fluid flowing through a reactor coolant system by rotation; And an electric motor driving unit for supplying driving force for rotating the impeller unit by being rotated by being supplied with electricity to rotate the impeller unit by using electricity, and a steam generator for rotating the impeller unit, And a turbine driving unit for supplying a driving force for rotating the impeller unit by being rotated by supplying a part of the impeller unit, wherein the rotary shaft of the impeller unit is rotated by at least one of the motor driving unit and the turbine driving unit, Among the turbine drives At least one of which is connected to receive the driving force.

According to an example of the present invention, the motor driving unit and the turbine driving unit may be respectively connected to the rotating shaft of the impeller unit so that the rotating shafts of the impeller unit are mutually shared.

According to another embodiment of the present invention, the turbine driving unit includes: a driving turbine that rotates about a rotational axis of the impeller unit using steam supplied from the steam generator; And the impeller portion is rotatably coupled to the main shaft portion by rotation of the main shaft portion and is coupled to the main shaft portion of the impeller portion by a magnetic force so as to face the main shaft portion, And a follower magnet portion which is rotated together with rotation.

The reactor coolant pump is configured to isolate the main rotor and the driven magnet from each other to maintain a pressure boundary between the primary fluid flowing inside the reactor coolant system and the secondary fluid flowing through the steam generator And may further include a diaphragm portion.

One of the motor driving portion and the turbine driving portion may share the rotation axis of the impeller portion and the other may be separated by the partition portion.

The reactor coolant pump is configured to isolate the primary fluid from the secondary fluid to maintain a pressure boundary between the primary fluid flowing through the reactor coolant system and the secondary fluid flowing through the steam generator And a sealing part installed in an area penetrating a part of the partition part so that the rotation axis of the impeller part is connected to the turbine driving part to prevent leakage of the primary fluid or the secondary fluid.

The seal may be configured to generate a flow from the secondary fluid side that forms a relatively lower pressure than the primary fluid to the primary fluid side.

According to another embodiment of the present invention, the reactor coolant pump may be in the form of a canned motor pump in which the primary fluid is sealed from the external environment.

According to another embodiment of the present invention, the motor drive unit includes a motor that converts electric energy into rotational motion, and a cooling unit that is configured to circulate cooling water along the outer surface of the motor to remove heat generated in the motor May be provided.

According to another embodiment of the present invention, the reactor coolant pump includes a steam generator for supplying steam to the steam generator, And a steam supply pipe branched from the main steam pipe connected to the outlet side and connected to the turbine driving unit.

The reactor coolant pump may further include a steam recovery pipe connecting the outlet side of the turbine drive unit through which the steam passes to the main engine so that the steam can be recovered from the steam passing through the turbine drive unit.

The reactor coolant pump may further include a steam recovery pipe connecting the outlet side of the turbine drive unit through which the steam passes and the turbine system so that the steam passing through the turbine drive unit can be recovered and utilized.

The reactor coolant pump may further include a steam recovery pipe connecting the outlet side of the turbine drive unit through which the steam passes and other steam pipes of the nuclear power plant through which the steam flows so that the steam passing through the turbine drive unit can be recovered and utilized .

At least one of the steam supply pipe and the steam recovery pipe may have a control valve configured to adjust a flow rate of steam flowing therein.

In order to achieve the above object, the present invention provides an integrated reactor in which main equipment provided in a reactor is installed inside a reactor vessel, comprising at least one of a storage portion and at least one of electricity and steam, And a nuclear reactor coolant pump configured to circulate the coolant fluid. Here, the enclosure encloses the outside of the reactor vessel so as to protect the reactor vessel, and the reactor coolant pump includes an impeller which is rotatably formed and circulates the primary fluid flowing inside the reactor coolant system by the rotation, And an electric motor driving part for supplying driving force for rotating the impeller part by being rotated by being supplied with electric power to rotate the impeller part by using electric power, and a motor driving part which is produced in the steam generator to rotate the impeller part by using steam And a turbine driving unit configured to supply a driving force to rotate the impeller unit by being rotated by receiving a part of the steam, wherein the rotating shaft of the impeller unit is rotated by at least one of the motor driving unit and the turbine driving unit, And And is connected to at least one of the turbine driving units to receive the driving force.

In order to achieve the above object, the present invention provides a separable nuclear reactor in which main equipment provided in a nuclear reactor is installed outside a reactor vessel, comprising at least one of a storage portion and at least one of electricity and steam, And a nuclear reactor coolant pump configured to circulate the coolant fluid. Here, the enclosure encloses the outside of the reactor vessel so as to protect the reactor vessel, and the reactor coolant pump includes an impeller which is rotatably formed and circulates the primary fluid flowing inside the reactor coolant system by the rotation, And an electric motor driving part for supplying driving force for rotating the impeller part by being rotated by being supplied with electric power to rotate the impeller part by using electric power, and a motor driving part which is produced in the steam generator to rotate the impeller part by using steam And a turbine driving unit configured to supply a driving force to rotate the impeller unit by being rotated by receiving a part of the steam, wherein the rotating shaft of the impeller unit is rotated by at least one of the motor driving unit and the turbine driving unit, And And is connected to at least one of the turbine driving units to receive the driving force.

According to the reactor coolant pump of the present invention and the nuclear power plant having the same, the motor drive unit and the turbine drive unit that provide driving force for rotating the impeller unit by using electricity and steam, respectively, and the impeller which is rotated by at least one of the motor drive unit and the turbine drive unit. It is possible to miniaturize the size of the reactor coolant pump which requires a high capacity. As a result, the installation space of the reactor coolant pump is minimized, and the design of the support structure is facilitated by the light weight of the reactor coolant pump.

Further, since the reactor coolant pump can be partially driven even when the steam is not smoothly formed by the motor drive unit, it is possible to appropriately cope with various situations in which operation of the reactor coolant pump is required.

In addition, since much of the energy used for driving the reactor coolant pump is steam, the energy loss generated in the electric production process can be reduced as compared with the electric motor dedicated method, and the energy loss generated in the turbine driving portion is recovered to the secondary system, Can be minimized.

In addition, it is possible to supply the steam generated during a considerable period of time in the steam generator even in the event of an accident by the turbine drive unit which operates with the steam produced by the steam generator, so that the coast down of the reactor coolant pump, Ability to improve. As a result, it is possible to maintain the core more safely in the event of an accident.

In addition, when the steam generator of a nuclear power plant is used as a means for removing residual heat, steam can be generated from the steam generator even after an accident, and the reactor coolant pump can be operated using such steam, The safety of the nuclear power plant can be further improved.

1 is a conceptual view showing a reactor coolant pump according to an embodiment of the present invention and a nuclear power plant having the same.
FIG. 2A is a conceptual view showing the reactor coolant pump shown in FIG. 1; FIG.
FIG. 2B is a conceptual diagram showing the pressure boundary of the reactor coolant pump shown in FIG. 2A. FIG.
FIG. 2C is a conceptual diagram illustrating a state in which the motor drive unit and the turbine drive unit of the reactor coolant pump shown in FIG. 2A operate together. FIG.
FIG. 2 (d) is a conceptual view showing a state in which the motor drive unit of the reactor coolant pump shown in FIG.
FIG. 2E is a conceptual diagram showing a state in which the turbine driving unit of the reactor coolant pump shown in FIG. 2A operates. FIG.
FIG. 3A is a conceptual view showing a reactor coolant pump according to another embodiment of the present invention; FIG.
FIG. 3B is a conceptual diagram showing a state in which the motor drive unit and the turbine drive unit of the reactor coolant pump shown in FIG.
4 is a conceptual view showing a reactor coolant pump according to another embodiment of the present invention.
FIG. 5 is a conceptual view illustrating a reactor coolant pump according to another embodiment of the present invention. FIG.
6 is a conceptual view showing a reactor coolant pump according to another embodiment of the present invention.

Hereinafter, a reactor coolant pump of the present invention and a nuclear power plant having the same will be described in detail with reference to the accompanying drawings. In the present specification, the same or similar components are denoted by the same or similar reference numerals in different embodiments, and the description thereof is replaced with the first explanation. As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

FIG. 1 is a conceptual diagram showing a nuclear reactor coolant pump 100 and a nuclear power plant 10 having the same according to an embodiment of the present invention. FIG. 2a is a conceptual diagram showing the reactor coolant pump 100 shown in FIG. 1, 2B is a conceptual view showing the pressure boundary of the reactor coolant pump 100 shown in FIG. 2A, FIG. 2C is a schematic view showing a state in which the motor drive unit 120 and the turbine drive unit 130 of the reactor coolant pump 100 shown in FIG. FIG. 2D is a conceptual diagram showing a state in which the motor drive unit 120 of the reactor coolant pump 100 shown in FIG. 2A is operated, FIG. 2E is a conceptual view showing a state in which the turbine drive unit of the reactor coolant pump shown in FIG. (130) is operated.

Referring to FIGS. 1 to 2E, the reactor coolant pump 100 includes an impeller 110, a motor drive 120, and a turbine drive 130.

The impeller 110 is formed to be rotatable for forming a flow in the fluid, and is configured to circulate the primary fluid flowing inside the reactor coolant system by the rotation. The reactor coolant system is a coolant system for transferring and transporting thermal energy generated by nuclear fission in a core 11a accommodated in a reactor vessel 11. Fig. 1 shows a nuclear power plant 10 having an integral nuclear reactor according to the present invention. In the integrated nuclear reactor, the main equipment provided in the reactor is installed inside the reactor vessel 11. For example, in the integrated reactor, main devices such as the steam generator 12, the pressurizer 13, and the impeller portion 110 of the reactor coolant pump 100 are installed inside the reactor vessel 11. Further, the impeller 110 can be disposed at an appropriate position inside the reactor vessel 11, such as the upper portion or the lower portion of the steam generator 12.

Further, the inside of the reactor vessel 11 is filled with the primary fluid. However, the reactor coolant pump 100 and the nuclear power plant 10 having the reactor coolant pump 100 may be applied to a separate nuclear reactor in which the main equipment provided in the reactor is installed outside the reactor vessel 11, though not shown in the figure.

The steam generator 13 is connected to the water supply system W and the turbine system T and is formed to flow a secondary fluid that is heat-exchanged with the primary fluid. Specifically, the steam generator 13 is disposed inside the reactor vessel 11, converts the water supplied from the water supply system W into steam using the heat generated in the core 11a, To the turbine system (T). Isolation valves 12a and 12b for maintenance and the like of the nuclear power plant 10 may be installed on the flow path connecting the steam generator 12 and the water supply system W and the turbine system T. [

Further, the nuclear power plant 10 may include a driven residual heat elimination system 14. The driven residual heat elimination system 14 is one of the safety systems related to the accident of the nuclear power plant 10 to remove the sensible heat of the reactor coolant system and the residual heat of the core 11a in the event of an accident of the nuclear power plant 10. For example, the driven residual heat elimination system 14 is disposed between the inflow path and the discharge path of the secondary fluid of the steam generator 12 and includes the sensible heat of the reactor coolant system and the residual heat of the core 11a The secondary fluid is condensed and cooled.

The motor driving unit 120 is provided to provide driving force for rotating the impeller unit 110 by being supplied with electricity so as to rotate the impeller unit 110 using electricity. For example, the motor driving unit 120 may include a motor 121 and a cooling unit 123.

The motor 121 is configured to convert the supplied electric energy into rotational motion. The motor 121 includes a rotor 121a and a stator 121b and may be configured to generate a rotational force in the rotor 121a by an induced current. In addition, the motor 121 may be connected to the power system 122 to receive electricity.

The cooling unit 123 may be formed to circulate the cooling water along the outer surface of the motor 121 so as to remove heat generated when the motor 121 is driven. To this end, the cooling unit 123 may be provided with a cooling water pipe 123a through which cooling water is supplied and discharged.

The turbine driving part 130 receives a part of the steam generated in the steam generator 12 shown in FIG. 1 and rotates to rotate the impeller part 110 by using the steam to rotate the impeller part 110 Thereby providing a driving force for rotating the motor. More specifically, the reactor coolant pump 100 is connected to the turbine driving part 130 by branching from a main combustion engine connected to the outlet side of the steam generator 12 to provide a flow path of the steam supplied to the turbine driving part 130 And a steam supply pipe 136 connected to the steam supply pipe 136. Although the turbine driving unit 130 is disposed at a position distant from the motor driving unit 120 with respect to the impeller unit 110, the positions of the turbine driving unit 130 and the motor driving unit 120 may be changed . That is, the turbine driving part 130 may be disposed closer to the motor driving part 120 than the impeller part 110.

Further, the reactor coolant pump 100 may further include a vapor recovery pipe 137.

1, the steam recovery pipe 137 is connected to the steam recovery unit 130, which is used for driving the turbine drive unit 130 so as to recover steam that has been supplied from the steam generator 12 and passed through the turbine drive unit 130, And may be formed to connect the outlet side of the turbine driving unit 130 through which the steam passes and the main steam pipe connected to the steam generator 12.

The steam recovery pipe 137 is connected to an outlet side of the turbine driving unit 130 through which the steam passes and an outlet side of the turbine system T (not shown), so that the steam passing through the turbine driving unit 130 can be used. As shown in FIG. The steam recovery pipe 137 may be formed so as to connect the outlet side of the turbine drive unit 130 through which the steam passes with another steam pipe of the nuclear power plant 10 through which the steam flows.

At least one of the steam supply pipe 136 and the steam return pipe 137 described above may be a control valve (not shown) configured to adjust the flow rate of the steam flowing in the steam supply pipe 136 or the steam return pipe 137 138). 1 shows an example in which the control valve 138 is installed on one section of the steam recovery pipe 137 and the control valve 138 is connected to the steam supply pipe 136 instead of the steam recovery pipe 137, Or may be installed on any one of the sections.

According to the reactor coolant pump 100 having the turbine drive unit 130, the steam supply pipe 136 and the steam recovery pipe 137 described above, a substantial part of the operation of the reactor coolant pump 100 is carried out by the steam The energy loss generated in the electric production process can be reduced and the energy loss generated in the turbine driving unit 130 can be recovered through the steam recovery pipe 137 to the secondary system, Lt; / RTI >

The rotating shaft 110a of the impeller 110 is connected to at least one of the motor driving unit 120 and the turbine driving unit 130 so as to rotate by at least one of the motor driving unit 120 and the turbine driving unit 130. [ And is connected to receive a driving force for rotating the impeller 110. 2A to 2E, the motor driving unit 110 and the turbine driving unit 120 may be configured so that the rotational axis 110a of the impeller unit 110 is shared by one of the impeller unit 110 Respectively, to the rotation axis 110a. The shaft 110a of the impeller 110 may be provided with a bearing 110b that supports the shaft and lubricates the shaft to reduce the resistance due to friction during rotation.

The turbine driving part 130 may include a driving turbine 131, a main rotor part 133 and a driven magnet part 134.

The drive turbine 131 is configured to convert fluid power into a mechanical rotational force. Specifically, the driving turbine 131 is rotated about the rotational axis 110a of the impeller 110 using steam supplied from the steam generator 12.

The main shaft portion 133 is coupled to the drive turbine 131 such that steam is supplied to the drive turbine 131 to rotate together when the drive turbine 131 is rotated. The proximal portion 133 can be rotated around the turbine shaft 130a.

The driven magnet portion 134 is disposed so as to face the magnet rotor portion 133 so as to cause the impeller portion 110 to rotate when the rotor portion 133 rotates and the rotary shaft portion 110a of the impeller portion 110 And is coupled to the main shaft portion 133 by a magnetic force. Thus, the follower magnet portion 134 is made to rotate by the magnetic force formed when the main rotor portion 133 rotates.

In addition, the reactor coolant pump 100 may further include a diaphragm 140a.

The diaphragm portion 140a is provided with a main rotor portion 133 and a driven main rotor portion 133 in order to maintain the pressure boundary between the primary fluid flowing in the reactor coolant system and the secondary fluid flowing through the steam generator 12 134 from each other. For example, as shown in FIG. 2B, the diaphragm 140a is disposed inside a casing 140 forming an outer appearance of the reactor coolant pump 100, and the motor drive unit 120 and the turbine driving unit 130 except for the driving turbine 131 and the main shaft portion 133 through which the secondary fluid flows.

Meanwhile, the reactor coolant pump 100 may be in the form of a canned motor pump in which the primary fluid is sealed from the external environment. Accordingly, the reactor coolant pump 100 eliminates the system associated with the separate sealing device for maintaining the pressure boundary of the primary fluid and the secondary fluid, thereby simplifying the structure of the reactor coolant pump 100 and reducing the size of the reactor 10 can be improved.

Hereinafter, the operation of the nuclear power plant 10 including the reactor coolant pump 100 will be described.

During normal operation of the nuclear power plant 10, the main engine and the main water supply pipe connected to the turbine system T and the water supply system W are opened by the isolation valves 12a and 12b in the opened state as shown in the figure And a safety system such as the passive residual heat removal system 14 installed for safety is closed by the isolation valve and does not operate.

When the electric power is supplied from the electric power system 122 during the normal operation of the nuclear power plant 10, the electric motor drive unit 120 operates and a part of the steam produced by the steam generator 12 is supplied to the steam supply pipe 136 And the turbine driving unit 130 is operated.

The steam supplied to the turbine driving unit 130 is then recovered as a main steam turbine connected to the outlet side of the steam generator 12 and mixed with steam of the main steam turbine and supplied to the turbine system T. [ At this time, the steam supplied to the turbine driving part 130 rotates the driving turbine 131, and as the driving turbine 131 rotates, the main rotor part 133 rotates and is rotated by the magnetic force formed by the main rotor part 133 And the follower magnet portion 134 is rotated.

The rotary shaft 110a of the impeller 110 connected to the driven magnet portion 134 rotates as the driven magnet portion 134 rotates and is rotated by the power of the motor driving portion 120 to the rotary shaft 110a The torque is added. Through the above process, the rotating shaft 110a is rotated, and the impeller 110 is rotated to circulate the primary fluid inside the reactor coolant system. In addition, in the case of the integral nuclear reactor, since the steam having a relatively high superheat is produced in the steam generator 12, even when a part of the steam is bypassed and utilized as the driving force of the turbine driving unit 130 and the steam is recovered, Can be supplied to the turbine system (T).

Even if the supply of electricity to the reactor coolant pump 100 is interrupted at the time of the accident of the nuclear power plant 10 and the motor drive unit 120 fails to operate, the sensible heat of the reactor coolant system and the residual heat generated by the core 11a Since the steam is formed in the steam generator 12 for a considerable period of time, the flow rate of the steam supplied to the turbine driving unit 130 can be sufficiently secured to operate the reactor coolant pump 100. Particularly, in the early stage of the accident of the nuclear power plant 10, since sufficient steam is produced under conditions similar to those in the normal operation, the coastal coolant (CO 2), which is abruptly reduced in its operation smoothly without interrupting the operation of the reactor coolant pump 100 ) Ability is improved. As a result, the safety of the core 12a can be further improved.

In the accident of the nuclear power plant 10, the main engine and the main water supply pipe used during normal operation of the nuclear power plant 10 are closed when the isolation valves 12a and 12b are closed, and a passive residual heat removal system (14), the isolation valve or the like connected thereto is opened and operated. Even in this case, since a considerable amount of steam is formed in the steam generator 12 for a considerable period of time, some of the steam is bypassed and supplied to the turbine driving part 130 to operate the reactor coolant pump 100 and increase the circulating flow rate of the reactor coolant. have.

Further, at the time of the accident of the nuclear power plant 10, the reactor is stopped and only the residual heat of the core 11a is formed, so that the steam produced by the steam generator 12 can be reduced more than during normal operation. However, since the heat (residual heat) generated in the reactor is greatly reduced at the time of the accident, the circulating flow rate of the reactor coolant required through the reactor coolant pump 100 also decreases. Therefore, even when the amount of steam generated in the steam generator 12 at the time of an accident decreases, a sufficient flow rate for maintaining the reactor core 11a in a safe state can be ensured.

According to the structure of the present invention described above, the motor drive unit 120, the turbine drive unit 130, the motor drive unit 120, and the turbine drive unit 130, which provide the driving force for rotating the impeller unit 110 using electricity and steam, The reactor coolant pump 100 can be miniaturized even when a high-capacity reactor coolant pump is required, because the impeller 110 is configured to be rotated by at least one of the plurality of coolant pumps 130. As a result, the installation space of the reactor coolant pump 100 occupying the nuclear power plant 10 is minimized, and the support structure of the reactor coolant pump 100 can be easily designed due to the light weight thereof.

Further, since the reactor coolant pump 100 can be partially driven even when the steam is not smoothly formed by the motor drive unit 120, it is possible to appropriately cope with various situations in which the operation of the reactor coolant pump 100 is required It is possible.

In addition, the reactor can maintain the integrity of the core 11a by maintaining the reactor coolant circulation flow rate at an appropriate level even during the stoppage of the reactor coolant pump 100 at the beginning of the accident. The steam generated by the steam generator 12 can be supplied to the turbine driving unit 130 which operates in response to the steam generated by the steam generator 12, It is possible to improve the coast down ability of the city reactor coolant pump 100. As a result, the stability of the core 11a can be maintained at the time of an accident. In addition, it is possible to exclude the installation of a structure such as a flywheel, which is provided in order to satisfy inertia slowing conditions, in a reactor coolant pump of a conventional exclusive motor type.

When the steam generator 12 of the nuclear power plant 10 is used as a residual heat eliminating means such as the driven residual heat eliminating system 14 in the event of an accident, steam is generated from the steam generator 12 even after the occurrence of an accident, Since it is possible to operate the reactor coolant pump 100, the safety of the nuclear power station 10 can be further improved by increasing the circulating capacity of the reactor coolant system.

Hereinafter, a nuclear reactor coolant pump 200 according to another embodiment of the present invention will be described with reference to FIGS. 3A and 3B.

FIG. 3A is a conceptual diagram showing a reactor coolant pump 200 according to another embodiment of the present invention. FIG. 3B is a schematic view of a reactor coolant pump 200 according to another embodiment of the present invention in which the motor drive unit 220 and the turbine drive unit 230 of the reactor coolant pump 200 shown in FIG. And FIG.

3A and 3B, the reactor coolant pump 200 includes an impeller portion 210, a motor driving portion 220, and a turbine driving portion 230. The impeller portion 210, the motor driving portion 220 and the turbine driving portion 230 function as the impeller portion 110, the motor driving portion 120 and the turbine driving portion 130 of the reactor coolant pump 100 described above, Have similar characteristics in terms of effectiveness.

The turbine drive unit 230 may include a drive turbine 231, a main rotor magnet 233, and a driven magnet 234.

The main rotor portion 233 is coupled to the drive turbine 231 so that the main rotor portion 233 is rotated together with the rotation of the drive turbine 231 rotating around the rotational axis 210a of the impeller portion 210 as the steam is supplied.

The follower magnet portion 234 is coupled to the main rotor portion 233 by magnetic force and is formed to rotate together with the main rotor portion 233 when rotated. The main rotor portion 233 and the driven pulley portion 234 are formed in such a manner that the main pulley portion 233 and the driven pulley portion 234 are formed so as to surround the main pulley portion 133, As shown in FIG.

Hereinafter, a nuclear reactor coolant pump 300 according to another embodiment of the present invention will be described with reference to FIG.

4 is a conceptual diagram showing a reactor coolant pump 300 according to another embodiment of the present invention.

4, the reactor coolant pump 300 includes an impeller part 310, a motor driving part 320, a turbine driving part 330, and a partition part 340a. The impeller portion 310, the motor driving portion 320, the turbine driving portion 330 and the partition portion 340a are connected to the impeller 110 of the reactor coolant pump 100, the motor driving portion 120, (130), and the diaphragm (140a).

The diaphragm portion 340a is disposed inside a casing 340 that forms an outer appearance of the reactor coolant pump 300 and includes a primary fluid flowing inside the reactor coolant system and a secondary fluid flowing through the steam generator 12 And is configured to isolate the main rotor portion 333 and the driven magnet portion 334 of the turbine driving portion 330 from each other so as to maintain the pressure boundary between the fluids.

One of the rotation axes of the motor driving unit 320 and the turbine driving unit 330 may be formed to share the rotation axis 310a of the impeller unit 310 and the other may be formed to be separated by the partition plate 340a. have. 4, the main shaft portion 333 and the driven magnet portion 334 are disposed opposite to each other, and the rotational shaft of the motor driving portion 320 is coupled to the driven magnet portion 334, The rotating shaft of the turbine driving part 330 is coupled to the main rotor part 333 and is separated from the rotating shaft 310a of the impeller part 310 by the partition part 340a .

Hereinafter, a nuclear reactor coolant pump 400 according to another embodiment of the present invention will be described with reference to FIG.

5 is a conceptual diagram showing a reactor coolant pump 400 according to another embodiment of the present invention.

Referring to FIG. 5, the reactor coolant pump 400 includes an impeller portion 410, a motor drive portion 420, a turbine drive portion 430, and a partition portion 440a. The impeller portion 410, the motor driving portion 420, the turbine driving portion 430 and the partition portion 440a are connected to the impeller 110 of the reactor coolant pump 100, the motor driving portion 120, (130), and the diaphragm (140a).

The diaphragm 440a is disposed inside a casing 440 forming an outer appearance of the reactor coolant pump 400 and includes a primary fluid flowing inside the reactor coolant system and a secondary fluid flowing through the steam generator 12 It may be formed to isolate the main rotor portion 433 and the driven magnet portion 434 of the turbine driving portion 430 from each other so as to maintain the pressure boundary between the fluids.

Here, the proximal magnet portion 433 and the follower magnet portion 434 are formed in a cylindrical shape, and a cylindrical prism portion 433 may be formed to surround the cylindrical prism portion 434. The thickness of the partition portion 440a (pressure boundary of the primary and secondary systems) is selectively adjusted so as to increase the transmission efficiency of the magnetic force transmitted from the main rotor portion 433 to the driven magnet portion 434 .

As described above, the shapes of the main rotor segments 133, 233, 333, 433 and the driven magnet segments 134, 234, 334, 434 can be formed in various forms according to the construction method of the reactor coolant pump.

Hereinafter, a reactor coolant pump 500 according to still another embodiment of the present invention will be described with reference to FIG.

6 is a conceptual view showing a reactor coolant pump 500 according to another embodiment of the present invention.

Referring to FIG. 6, the reactor coolant pump 500 includes an impeller portion 510, a motor drive portion 520, a turbine drive portion 530, and a partition portion 540a. The impeller portion 510, the motor driving portion 520, the turbine driving portion 530 and the partition portion 540a are connected to the impeller portion 110 of the reactor coolant pump 100, the motor driving portion 120, (130), and the diaphragm (140a).

The turbine drive unit 530 may be provided with a drive turbine 531 that is configured to receive steam from the steam generator 12 and rotate around the rotation axis 510a of the impeller unit 510 using the supplied steam. have. Unlike the turbine driving unit 130 shown in FIGS. 2A and 2E, the turbine driving unit 530 can be formed without the main rotor magnet 133 and the driven magnet 134.

The driving turbine 531 may be directly connected to the rotating shaft 510a of the impeller unit 510. 6, the motor 521 of the motor driving unit 520 and the driving turbine 531 of the turbine driving unit 530 are directly coupled to the rotating shaft 510a of the impeller unit 510 May be formed to cause rotation.

Here, the reactor coolant system 500 may further include a diaphragm portion 540a and a seal portion 550.

The diaphragm portion 540a is disposed inside a casing 540 that forms an outer appearance of the reactor coolant pump 500 and includes a primary fluid flowing inside the reactor coolant system and a secondary fluid flowing through the steam generator 12 And is configured to isolate the primary fluid from the secondary fluid to maintain a pressure boundary between the fluid.

The sealing portion 550 may be formed in a manner such that the rotational axis 510a of the impeller portion 510 is connected to the turbine driving portion 530, for example, the driving turbine 531, And may be installed in an area penetrating a part of the partition part 540a. The seal 550 is configured to prevent leakage of the primary fluid or secondary fluid thereby relieving the disadvantage that the reactor coolant pump 500 does not form a structurally completely isolated form of pressure boundary can do.

For example, the seal 550 may be configured to generate a flow from the secondary fluid side that forms a relatively lower pressure than the primary fluid to the primary fluid side. Thus, it is possible to prevent the cooling water (primary fluid) of the high-pressure system from leaking to the cooling water (secondary fluid) of the low-pressure system.

However, the scope of the present invention is not limited to the configuration and method of the embodiments described above, and all or some of the embodiments may be selectively combined so that various modifications may be made to the embodiments. In addition, the present invention can be applied to all equivalents of inventions, such as inventions that can be modified, added, deleted, or replaced at the level of those skilled in the art, It belongs to the scope is self-evident.

10: Nuclear reactor 100: Reactor coolant pump
110: impeller part 120: motor driving part
130: turbine driving part 140: casing
140a:

Claims (16)

A reactor coolant pump for circulating fluid within a reactor coolant system, the reactor coolant pump comprising:
An impeller portion rotatably formed to circulate the primary fluid flowing through the inside of the reactor coolant system by the rotation;
A motor driving unit configured to provide a driving force for rotating the impeller unit by being rotated by electricity to rotate the impeller unit using electricity; And
And a turbine driving unit for supplying a driving force to rotate the impeller unit by rotating a portion of the steam produced in the steam generator so as to rotate the impeller unit using steam,
Wherein the impeller portion is connected to at least one of the motor driving portion and the turbine driving portion so as to be rotated by at least one of the motor driving portion and the turbine driving portion to receive the driving force,
The turbine-
A driving turbine that rotates about a rotational axis of the impeller using steam supplied from the steam generator;
A main shaft portion coupled to the drive turbine to be rotated together when the drive turbine rotates; And
The impeller portion being disposed to face the proximal portion so as to rotate by the rotation of the proximal portion of the proximal portion and to be connected to the rotation axis of the impeller portion and coupled to the proximal portion by a magnetic force, And a driving magnet portion which is made to be movable,
Wherein the motor drive portion and the driven magnet portion are isolated from the main rotor portion so that the primary fluid flowing in the reactor coolant pump is sealed from the external environment so that the primary fluid can not enter and exit the reactor core portion. Pump. The method according to claim 1,
Wherein the motor driving unit and the turbine driving unit are respectively connected to the rotating shaft of the impeller unit so that the rotating shafts of the impeller unit are mutually shared. delete The method according to claim 1,
Further comprising a diaphragm portion configured to isolate the main magnet portion and the driven magnet portion from each other in order to maintain a pressure boundary between the primary fluid flowing in the reactor coolant system and the secondary fluid flowing through the steam generator, Wherein the reactor coolant pump is a reactor coolant pump. 5. The method of claim 4,
Wherein one of the motor drive unit and the turbine drive unit is formed to share a rotation axis of the impeller unit and the other one of the rotation shafts is separated by the partition plate. 3. The method of claim 2,
A diaphragm portion configured to isolate the primary fluid from the secondary fluid to maintain a pressure boundary between the primary fluid flowing in the reactor coolant system and the secondary fluid flowing through the steam generator; And
Further comprising a sealing portion installed in an area penetrating a part of the partition portion so that the rotation axis of the impeller portion is connected to the turbine driving portion to prevent leakage of the primary fluid or the secondary fluid. The method according to claim 6,
Wherein the seal is configured to generate a flow from the secondary fluid side that forms a relatively lower pressure than the primary fluid to the primary fluid side. delete The method according to claim 1,
The motor-
A motor for converting electrical energy into rotational motion; And
And a cooling unit configured to circulate cooling water along an outer surface of the motor to remove heat generated in the motor. The method according to claim 1,
Further comprising a steam supply pipe branched from the main steam pipe connected to the outlet side of the steam generator and connected to the turbine drive unit to provide a steam flow path to the turbine driving unit. 11. The method of claim 10,
Further comprising a steam recovery pipe connecting the outlet side of the turbine drive unit through which the steam passes to the main combustion engine so that the steam passing through the turbine drive unit can be recovered and utilized. 11. The method of claim 10,
Further comprising a steam recovery pipe connecting the outlet side of the turbine drive unit through which the steam passes to the turbine system so that the steam passing through the turbine drive unit can be recovered and utilized. 11. The method of claim 10,
Further comprising a steam recovery pipe connecting an outlet side of the turbine drive unit through which the steam passes and another steam pipe of a nuclear power plant through which the steam flows so that the steam passing through the turbine drive unit can be recovered and utilized. 14. The method according to any one of claims 10 to 13,
Wherein at least one of the steam supply pipe and the steam recovery pipe includes a control valve configured to adjust a flow rate of steam flowing therein. In a monolithic reactor in which main equipment provided in a reactor is installed inside a reactor vessel,
A compartment for enclosing the outside of the reactor vessel to protect the reactor vessel; And
And a reactor coolant pump configured to circulate a primary fluid within the reactor coolant system using at least one of electricity and steam,
The reactor coolant pump,
An impeller portion disposed inside the reactor vessel and rotatably formed to circulate a primary fluid flowing through the inside of the reactor coolant system by the rotation;
A motor driving unit disposed outside the reactor vessel and provided with a driving force for rotating the impeller unit by being rotated by electricity to rotate the impeller unit by electricity; And
And a turbine driving unit disposed on the outside of the reactor vessel for supplying a driving force to rotate the impeller unit by rotating a portion of the steam produced by the steam generator so as to rotate the impeller unit using steam,
Wherein the impeller portion is connected to at least one of the motor driving portion and the turbine driving portion so as to be rotated by at least one of the motor driving portion and the turbine driving portion to receive the driving force,
The turbine-
A driving turbine that rotates about a rotational axis of the impeller using steam supplied from the steam generator;
A main shaft portion coupled to the drive turbine to be rotated together when the drive turbine rotates; And
The impeller portion being disposed to face the proximal portion so as to rotate by the rotation of the proximal portion of the proximal portion to be connected to the rotation axis of the impeller portion and coupled to the proximal portion by a magnetic force, And a driving magnet portion which is made to be movable,
Wherein the motor drive portion and the driven magnet portion are isolated from the main rotor portion so that the primary fluid flowing on the reactor coolant pump is sealed from the external environment so that the primary fluid can not flow in and out. In a separate type reactor in which the main equipment provided in the reactor is installed outside the reactor vessel,
A compartment for enclosing the outside of the reactor vessel to protect the reactor vessel; And
And a reactor coolant pump configured to circulate a primary fluid within the reactor coolant system using at least one of electricity and steam,
The reactor coolant pump,
An impeller portion disposed inside the reactor vessel and rotatably formed to circulate a primary fluid flowing through the inside of the reactor coolant system by the rotation;
A motor driving unit disposed outside the reactor vessel and provided with a driving force for rotating the impeller unit by being rotated by electricity to rotate the impeller unit by electricity; And
And a turbine driving unit disposed on the outside of the reactor vessel for supplying a driving force to rotate the impeller unit by rotating a portion of the steam produced by the steam generator so as to rotate the impeller unit using steam,
Wherein the impeller portion is connected to at least one of the motor driving portion and the turbine driving portion so as to be rotated by at least one of the motor driving portion and the turbine driving portion to receive the driving force,
The turbine-
A driving turbine that rotates about a rotational axis of the impeller using steam supplied from the steam generator;
A main shaft portion coupled to the drive turbine to be rotated together when the drive turbine rotates; And
The impeller portion being disposed to face the proximal portion so as to rotate by the rotation of the proximal portion of the proximal portion to be connected to the rotation axis of the impeller portion and coupled to the proximal portion by a magnetic force, And a driving magnet portion which is made to be movable,
Wherein the motor drive portion and the driven magnet portion are isolated from the main rotor portion so that the primary fluid flowing on the reactor coolant pump is sealed from the external environment so that the primary fluid can not flow in and out.

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