JPH08122475A - Drive for control rod drive mechanism - Google Patents

Abstract

PURPOSE: To efficiently use control rod drive mechanisms by selecting many of them to drive them by a few power supply units and providing spare power supply units. CONSTITUTION: For example, a controller 9, a power supply unit 10, a spare power supply unit 11, a control rod switcher 12 and a man-machine device 5 are provided for 205 control rod drive mechanisms 1. By selecting drive electricity outputted by the power supply unit 10 on signals from the controller 9 in response to information commands from the man-machine device 5 for each of a few of the control rod drive mechanisms 1 operated simultaneously and supplying it to them with the control rod switcher 12, the control rods are moved to target positions to control the operation of a nuclear reactor. During the failure of the power supply unit 10 or the full insertion of all control rods, moreover, a net working rate is improved by actuating the spare power supply unit 11 automatically according to the increase of a load in case of the simultaneously operation of the control rod drive mechanisms 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive unit for an electric motor driven control rod drive mechanism in a nuclear power plant.

[0002]

2. Description of the Related Art A control rod drive mechanism in a nuclear power plant is a motor driven by a highly functional and simplified structure from a control rod drive mechanism that inserts and pulls out a control rod by hydraulic drive due to the recent progress in control technology. Therefore, a control rod drive mechanism driven by an electric motor has been adopted in which the control rod is inserted and pulled out and the position of the control rod is controlled by the rotation angle of the drive motor.

As shown in the system block diagram of FIG. 3 and the control block diagram of FIG. 4, a conventional drive unit for controlling a control rod drive mechanism driven by an electric motor is generally controlled by 205 electric motor driven control rod drive mechanisms 1 ( Hereinafter, 205 inverter power supplies 2 of the same number as the control rod drive mechanism) and 205 inverter controllers 3 are connected to each of the inverter power supplies 2.

Further, the inverter controller 3 is collectively controlled by one controller 4, which is a controller 4.
Is configured to be operated by an operator via the man-machine device 5.

In the man-machine device 5, the operator is
Selection control rod No. , And the control rod drive mode (step, notch, continuous), and the control rod insertion and withdrawal modes are input as information. These commands are control rod drive signal S ₁
Is output to the control device 4.

In the control device 4, the control rod drive signal S ₁ from the man-machine device 5 and the control rod position signal S ₂ from each control rod drive mechanism 1 are input, and the inverter of the predetermined control rod drive mechanism 1 is input. The drive inverter selection signal S ₃ is output to the inverter controller 3 that controls the power supply 2.

As a result, the inverter controller 3 outputs the inverter drive signal S ₄ to the inverter power supply 2, and the inverter power supply 2 supplies the control rod drive mechanism 1 with electric power for driving a drive motor (not shown). A control rod (not shown) connected to the control rod drive mechanism 1 is inserted and pulled out.

Further, as shown in FIG. 4, in the control device 4, the control rod position signal S ₂ from the control rod drive mechanism 1
A target position when the control rod is driven by the target position calculation unit 6 based on the control rod insertion / extraction signal S _{5 of} the control rod drive signal S ₁ input from the man-machine device 5 and the control rod drive mode signal S _6. To calculate.

Based on the target position signal S ₇ output from the target position calculating unit 6 and the control rod position signal S ₂ from the control rod driving mechanism 1, the drive signal creating unit 7 controls the control rod position signal S _2.
Until the inverter reaches the target position signal S ₇
A drive inverter selection signal S ₃ which is a signal for driving the drive circuit is output.

The drive inverter selection signal S ₃ output from the drive signal creating section 7 is output to the inverter controller 3, and the inverter controller 3 which is the output destination of the drive inverter selection signal S ₃ Selected control rod No. of the control rod drive signal S ₁ output from the man-machine device 5. The signal S ₈ determines the inverter controller selection signal S ₉ determined by the drive inverter determination unit 8.

That is, the inverter controller selection signal S ₉
Thus, the control rod drive mechanism 1 to be driven is selected.

In the inverter controller 3 selected by the inverter controller selection signal S ₉ from the control device 4, the drive inverter selection signal S ₃ is input and the inverter drive signal S which is a switching operation signal for driving the inverter. Create ₄ and output to the inverter power supply 2.

As a result, the inverter power supply 2 is driven by the inverter drive signal S ₄ from the inverter controller 3 and supplies the control rod drive mechanism 1 with drive power to the target position.
It should be noted that the total control rod total insertion signal S ₁₀ is transmitted to the target position calculation unit 6 and the drive inverter determination unit 9 if necessary,
All the control rod drive mechanisms 1 perform all insertion operations by the drive power supplied from the respective inverter power supplies 2.

[0014]

In the nuclear power plant having the control rod drive mechanism 1 driven by the electric motor as described above, the drive device is provided with one inverter power source 2 for each control rod drive mechanism 1. Therefore, the number of inverter power supplies 2 is 205, which is a huge number.

However, in controlling the drive of the control rods during the normal operation in the nuclear power plant, even when the control rods are automatically controlled by the computer, it is not necessary to drive a large number of motor-driven control rod drive mechanisms at a time. The maximum is to operate 26 control rods at the same time.

Further, since the control rods are inserted by hydraulic drive of the hydraulic unit during an emergency insertion, it is not necessary to operate all the control rod drive mechanisms 1 by the drive motor in an emergency and at the same time. However, when all the control rods are driven except during the emergency insertion, the operating speed will be reduced if the capacity of the inverter power supply 2 is insufficient.

From the above, one control rod drive mechanism 1 is provided.
Having the inverter power supply 2 for a table increases the number of the inverter power supplies 2 and tends to cause a problem that the noise generated from the inverter power supplies 2 increases. Further, there is a problem that the configuration of the entire drive device becomes complicated, the number of man-hours for maintenance becomes huge, and the system price becomes expensive.

The object of the present invention is to reduce the number of power supply facilities by selecting a large number of control rod drive mechanisms and driving them with one or several power supply facilities, and to provide a backup power supply facility. It is an object of the present invention to provide a drive unit for a control rod drive mechanism which is switched to a standby power source facility or used together when equipment is out of order and all control rods are driven.

[0019]

In order to achieve the above object, a control rod drive mechanism drive device according to the invention of claim 1 is a control rod drive mechanism drive device driven by an electric motor of a nuclear power plant. A power supply facility and a standby power supply facility of a number smaller than the total number of installed drive mechanisms, a control rod switching device that switches the power supply for driving the control rod drive mechanism, and a control device that controls the control rod switching device,
It is characterized by comprising a man-machine device which is an interface between the control device and an operator.

According to a second aspect of the present invention, there is provided a drive unit for a control rod drive mechanism, wherein in the drive unit for the control rod drive mechanism driven by the electric motor, the power source of the control rod drive mechanism is switched to a standby power source facility when the power source equipment fails. It is characterized by

According to a third aspect of the present invention, there is provided a drive unit for a control rod drive mechanism, wherein in the drive unit for the control rod drive mechanism driven by the electric motor, the power supply facility and the standby power supply facility are used together when all the control rods are inserted. Is characterized by.

According to a fourth aspect of the present invention, there is provided a drive device for a control rod drive mechanism, wherein in the drive device for a control rod drive mechanism driven by the electric motor, the power supply equipment and the standby power supply equipment are installed when a plurality of control rod drive mechanisms are simultaneously driven. The feature is that they are used together.

[0023]

According to the first aspect of the present invention, during normal operation of the nuclear reactor, according to the information command from the man-machine device, the drive power output from, for example, one power supply facility is simultaneously operated by a signal from the control device. For a few control rod drive mechanisms,
Each is selected and supplied by the control rod switching device, the control rod is moved to the target position, and the operation control of the reactor is performed.

According to a second aspect of the present invention, when the power supply equipment fails during the operation of the nuclear reactor, the control device which receives the power supply failure signal from the power supply equipment supplies the drive power supply to the control rod drive mechanism to the standby power supply equipment. Switch to and continue operation control of the reactor without any problems.

According to the third aspect of the present invention, when all the control rods are fully inserted when the reactor is stopped, the control device which receives the all control rods full insertion signal also drives the standby power source equipment to drive the control rods. The drive power supply to the mechanism is used together with the above-mentioned power supply equipment together with the standby power supply equipment, whereby a sufficient drive power supply capacity is secured for all the control rod drive mechanisms, and all the control rods can be fully inserted quickly.

According to a fourth aspect of the present invention, when the number of control rod drive mechanisms simultaneously driven during operation control of the nuclear reactor exceeds the capacity of the power source, the control device determines the number of control rod drive mechanisms to be driven. A standby power source facility is driven, and a sufficient drive power source capacity is secured by using the power source facility and the standby power source facility together, and operation control of the nuclear reactor is performed without any trouble.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. Note that the same components as those of the above-described related art are denoted by the same reference numerals, and detailed description thereof is omitted. FIG. 1 is a system configuration diagram, and FIG. 2 shows a control block diagram. The present invention is provided with a power supply equipment by one inverter for the control rod drive mechanism 1 driven by a large number of electric motors, and the output of the power supply equipment is appropriately switched to drive the selected control rod drive mechanism 1.

In addition, if power is supplied from a single power supply facility, a failure of the power supply facility or the like leads to a decrease in operating rate and reliability. When the control rod drive mechanism 1 is simultaneously driven when the control rod is fully inserted,
In addition to improving the operating rate and reliability by automatically starting the standby power supply facility, we are also improving the economic efficiency by reducing the single unit capacity of the power supply facility and standby power supply facility, respectively.

As shown in FIG. 1, the drive unit of the present invention has, for example, one control unit 9 and a power supply facility 10, an auxiliary power supply facility 11, and a control rod switching unit 12 for 205 control rod drive mechanisms 1. And the man-machine device 5.

The man-machine device 5 is a control rod No. selected by an operator of the power plant. When the control rod drive mode (step notch, continuous), and control rod insertion, and extraction mode, all the control rods information of the entire insert command or the like is input, the control device the respective information as a control rod drive signals S ₁ 9 Output to.

As shown in detail in FIG. 2, the controller 9 includes a target position calculator 6, a drive signal generator 7, a switching signal determiner 13 and an interlock circuit 14, and the man-machine device 5 Control rod drive signal S ₁ of control rod insertion / withdrawal signal S ₅ , control rod drive mode signal S ₆ , and selected control rod No. The signal S ₈ , the control rod position signal S ₂ from each control rod drive mechanism 1, and the power failure signal S ₁₁ from the power supply equipment 10 are input to supply the power drive signal S ₁₂ and the standby power drive signal S ₁₃ , and Output the control rod switching signal S ₁₄ ,
The power supply equipment 10, the standby power supply equipment 11, and the control rod switching device 12 are controlled respectively.

Each of the power supply equipment 10 and the standby power supply equipment 11 is a power supply device using an inverter, and is controlled by the power supply drive signal S ₁₂ and the standby power supply drive signal S ₁₃ from the control device 9 to be controlled by the control rod switching device 12. Drive power is supplied to the rod drive mechanism 1.

However, none of them has a power supply capacity for simultaneously driving all 205 control rod drive mechanisms 1 in a single machine, and the number of simultaneous operation of the control rod drive mechanisms 1 to be carried out during normal reactor power control is sufficient. Power supply with sufficient capacity
The capacity that enables the simultaneous drive of all control rod drive mechanisms 1 by using 10 and standby power supply equipment 11 together.

The control rod switching device 12 is provided with switches and the like corresponding to all the control rod driving mechanisms 1, and the control rod switching signal S ₁₄ from the control device 9 causes the switch O of the selected switch to be turned on.
Power supply equipment 10 and standby power supply equipment 11 are turned on and off.
The drive power from is supplied to a predetermined control rod drive mechanism 1.

The control rod drive mechanism 1 is a control rod switching device.
The drive power supplied from 12 is configured to perform insertion or withdrawal operation on the core of the control rods (not shown) connected thereto.

Next, the operation of the above configuration will be described. During normal reactor operation, as shown in FIG. 2, in the control device 9, the control rod drive signal S ₁ input from the man-machine device 5 is the control rod insertion / extraction signal S ₅ , and the control rod drive mode signal S ₆ And the control rod position signal S ₂ from the control rod drive mechanism 1 calculates the target position for driving the control rod in the target position calculation unit 6.

The target position signal S ₇ output from the target position calculator 6 and the control rod position signal S from the control rod drive mechanism 1
₂ , the drive signal producing section 7 produces the power supply drive signal S ₁₂ for driving the power supply equipment 10 until the control rod position signal S ₂ reaches the target position signal S ₇ . In addition, the power supply drive signal S ₁₂ from the drive signal creation unit 7 is input to the power supply equipment 10 to drive the power supply equipment 10.

Further, from the control device 9 to the control rod switching device 12
To the selection control rod No. input to the man-machine device 5.
The signal S ₈ is converted into a control rod switching signal S ₁₄ which is a signal for turning on the switch corresponding to each control rod driving mechanism 1 in the control rod switching device 12 by the switching signal determination unit 13 and output.

As a result, the control rod drive mechanism 1 of each selected control rod is supplied with predetermined drive power from the power supply facility 10 via the control rod switching device 12, and the control rod drive mechanism 1 drives the control rods. The output of the reactor is controlled by inserting or pulling it out to a target position at a predetermined speed.

The interlock circuit 14 of the control unit 9
So, we constantly monitor the condition of the power supply equipment 10,
When an abnormality occurs in 10 and the power supply failure signal S ₁₁ is output and the control rod insertion / withdrawal signal S ₈ is input from the man-machine device 5, the standby power supply is driven to the standby power supply equipment 11. The signal S ₁₃ is output and the standby power supply equipment 11 is operated to control the output of the control rod and the reactor by driving the control rod drive mechanism 1 without any trouble.

When the control device 9 receives the all-control-rods insertion signal S ₁₀ from the man-machine device 5, the switching determination unit 13
In order to supply drive power to all the control rod drive mechanisms 1, a control rod switching signal S ₁₄ for turning on the switch for each control rod in the control rod switching device 12 is created, and from the interlock circuit 14 The standby power supply drive signal S ₁₃ is output.

As a result, the power supply facility 10 and the standby power supply facility 11
Both are driven and sufficient power is supplied to drive all the control rod drive mechanisms 1 by using both power supply facilities together, so that all the control rods of all the control rod drive mechanisms 1 are fully inserted by a motor drive at high speed. Then, the reactor is safely shut down.

Further, even during normal reactor operation, if the number of drives is particularly large due to the simultaneous drive of the plurality of control rod drive mechanisms 1, the controller 9 supplies a standby power source according to the number of drive of the control rod drive mechanism 1. A drive signal is output to drive the standby power supply equipment 11.

As a result, since the control rod drive mechanism 1 uses both the power supply equipment 10 and the standby power supply equipment 11 as the drive power source, sufficient drive power is ensured and a large number of control rod drive mechanisms 1 can be driven without any trouble. You can

In the above embodiment, one power supply facility 10 and standby power supply facility are provided for many control rod drive mechanisms 1.
Although the configuration in which 11 is provided has been described, even if a plurality of power supply facilities 10 and standby power supply facilities 11 are installed, or in order to improve the efficiency of the installation location, etc., they are the same as in the above embodiment. Of course, the action and effect can be obtained.

[0046]

As described above, according to the present invention, in a nuclear power plant equipped with a control rod drive mechanism driven by an electric motor,
The number of power supply facilities by the inverter that drives the control rod drive mechanism related to control rod operation is reduced, and the configuration of the drive device is greatly simplified.

This makes it easy to secure and maintain the installation location of the equipment, reduces the influence of noise generated from the power source, improves reliability and safety in operating the nuclear power plant, and is economical. Also has an excellent effect.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a drive device of a control rod drive mechanism according to an embodiment of the present invention.

FIG. 2 is a control block diagram of an embodiment according to the present invention.

FIG. 3 is a system configuration diagram of a drive device of a conventional control rod drive mechanism.

FIG. 4 is a conventional control block diagram.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Control rod drive mechanism driven by an electric motor, 2 ... Inverter power source, 3 ... Inverter controller, 4, 9 ... Control device, 5 ...
Man-machine device, 6 ... Target position calculation unit, 7 ... Drive signal creation unit, 8 ... Drive inverter determination unit, 10 ... Power supply equipment, 11 ...
Standby power supply equipment, 12 ... control rod switching device, 13 ... switching signal determination unit, 14 ... interlock circuit, S ₁ ... control rod driving signal,
S ₂ ... Control rod position signal, S ₃ ... Drive inverter selection signal, S ₄ ... Inverter drive signal, S ₅ ... Control rod insertion / extraction signal, S ₆ ... Control rod drive mode signal, S ₇ ... Target position signal, S ₈ ... Selection control rod No. Signals, S ₉ ... inverter controller selection signals, S ₁₀ ... all the control rods fully inserted signal, S ₁₁ ... power failure signal, S ₁₂ ... Power drive signal, S ₁₃ ... standby power supply driving signals, S ₁₄ ... control rod switching signal .

Claims (4)

[Claims] 1. A drive device for a control rod drive mechanism driven by an electric motor of a nuclear power plant, wherein the number of power supply facilities and standby power supply facilities is less than the total number of control rod drive mechanisms installed, and the control rod drive mechanism is driven. Drive of a control rod drive mechanism, comprising: a control rod switching device for switching the power supply; a control device for controlling the control rod switching device; and a man-machine device which is an interface between the control device and an operator. apparatus. 2. The control rod drive mechanism according to claim 1, wherein in the drive device for the control rod drive mechanism driven by the electric motor, the power source of the control rod drive mechanism is switched to the standby power source facility when the power source equipment fails. Drive. 3. The control rod drive mechanism drive apparatus according to claim 1, wherein in the drive device for the control rod drive mechanism driven by the electric motor, the power supply facility and the standby power supply facility are used together when all the control rods are inserted. apparatus. 4. The control rod drive according to claim 3, wherein, in the drive device of the control rod drive mechanism driven by the electric motor, the power supply facility and the standby power supply facility are used together when a plurality of control rod drive mechanisms are simultaneously driven. Mechanism drive.