JPS61164187A - Controller for movable coil type control rod driving device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a method of controlling a moving coil type control rod drive device for a nuclear reactor.

[Conventional technology]

Diagram M3 is a configuration diagram showing an example of a moving coil type control rod drive device for a nuclear reactor. (1) is a pressure pipe, and (2) is the pressure pipe (1).
(3) is a coil drive device consisting of a motor, gear mechanism, etc.; (4) is a roller housing.

(5) is a roller, (6) is a rising coil, (7) is a descending coil, (8) is an electromagnetic plunger, (9) is a ball bearing, Ql is a differential transformer coil, (11) is a differential This is a core for transformers.

As shown in the figure, there is a rising coil (6) and a descending coil (6).
7), a roller housing (4), and a differential transformer coil a.

It is arranged around the outer periphery of the pressure pipe (1) and is connected to the coil drive device (3), and the coil drive device 1i (
3), it is configured to move up and down along the outer periphery of the pressure pipe (1). It is also fixed to the lower part of the drive shaft (2), and includes an electromagnetic plunger (8) and a pole bearing (9).
An electromagnetic plunger assembly (b) consisting of a differential transformer core αυ is magnetically coupled to the electromagnetic coil assembly via a pressure pipe (1), and follows the movement of the magnetic coil assembly. and move. As a result, the drive shaft (2) that fixes the electromagnetic plunger assembly moves up and down, and the control rod (not shown) connected to the upper part of the drive shaft (2) has a fuel shielding effect in the reactor. changes, which in turn controls the reactor's output.

When the above-mentioned electromagnetic coil assembly (21) is raised and lowered, as shown in FIG.
) and set the current of lowering coil (7) to 8.
The current is set to Df to generate a force that pulls the electromagnetic plunger (2) upward. Conversely, when descending, the current is set to the descending coil (7), and the '1 current of the ascending coil (6) is set to B, so as to generate a force for pulling the electromagnetic plunger c21) downward. There is.

In addition, the ascending coil (6) and descending coil (
The number of forces is determined to be the optimum number depending on the load.

By the way, a control device is provided to correct an error in the displacement of the electromagnetic plunger assembly (2) that moves following the electromagnetic coil assembly (phase) with respect to the electromagnetic coil assembly [phase]. FIG. 4 is a configuration diagram showing an example of the control device, and (30) is a motor drive circuit.

01) is a rising coil control circuit, (3 old is a descending coil control circuit, C3 East is a coil by a differential transformer, a plunger relative position detector, and K is a rising and falling signal.

A positional shift between the electromagnetic coil and the electromagnetic plunger is detected by the detector 031, and if the electromagnetic plunger, that is, the drive shaft is lowered, the signal is sent to the rising coil control circuit (3).
I), the descending coil control circuit IJ21 feeds back to increase the current in the ascending coil (6) and decrease the current in the descending coil (7), thereby increasing the electromagnetic plunger (
8), and conversely, if the electromagnetic plunger (8) rises too far, it functions in the opposite way to pull down the electromagnetic plunger (8). Setting current values A, B in Fig. 5,
The interval Δi between the upper and lower points of C and D indicates the control range. In addition, when controlling, do not always raise and lower the current of both the ascending coil and descending coil at the same time.
Sometimes the current in one coil is kept constant.

[Problem that the invention seeks to solve]

The control device for the control rod drive device of a nuclear reactor is configured as described above. By the way, the forces acting on the drive shaft (2) of the control rod drive device are usually the dead weight of the drive shaft (2) body,
In addition to the magnetic force and frictional force acting between the electromagnetic coil assembly Co., Ltd. and the electromagnetic plunger (2), the force caused by the coolant cannot be overlooked. That is, since the coolant in a nuclear reactor is subject to flow rate adjustment according to flow rate fluctuations during rated operation of the reactor or according to the reactor output, the drive shaft has a flow rate that corresponds to the flow rate change.

An upward or downward force acts, which sometimes exceeds the control range of the control device, and is a major cause of reduced accuracy of the control device, which has been a drawback of conventional devices.

The present invention was made to eliminate these drawbacks of conventional devices, and provides a control device for a control rod drive device that corrects the influence of load fluctuations on the drive shaft due to fluctuations in the flow rate of coolant in a nuclear reactor. It is something to do.

[Means to solve the problem]

In order to achieve the above purpose, a control device l of a control rod drive device is provided.
A detector for load fluctuations on the drive shaft is provided, and a signal for load fluctuations caused by changes in coolant flow rate, etc. is sent to both or one of the ascending coil control circuit and descending coil control circuit of the control device. The set current control function responds to load fluctuations by changing the set current when the coil rises or falls depending on the load situation, and feedback from the signal from the relative position detector of the coil plunger. It is intended to perform control at the same time.

[Function] Conventionally, due to fluctuations in the flow rate of the coolant in the furnace, the load on the drive shaft increases (varies), which causes phenomena that exceed the control range of the control device and make it impossible to position the drive shaft. However, by providing the above means, this phenomenon was prevented and the accuracy of the control device was improved.

[Embodiments of the invention]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, in which (1) to
(c) is the same as the conventional device. (34) is a load fluctuation detector for the drive shaft.

In the figure, load fluctuations on the drive shaft are captured by, for example, fluctuations in the flow rate of coolant, detected by the load fluctuation detector 04), and the resulting signal is sent to the control circuit (3) for the ascending and descending coils.
]), (33), and the current set value of each coil is changed according to the load.Furthermore, this current is feedback-controlled by the signal of the coil plunger relative position detector (to). The figure is a diagram showing this control situation. When the downward load on the drive shaft increases,
The set current value P(
(when ascending) and Q (when descending), and decrease the set current and current values R, (when descending) and S (when ascending) of the descending coil, and further convert this changing current into relative position detector 0. Since the control shown by the dotted line is carried out in response to the failure signal, the control range is expanded compared to the conventional device shown in Fig. 4, which controls a constant current in response to load fluctuations. It can be seen that the control accuracy will improve accordingly.

Note that in the examples shown in Figures 1 and 2, both the ascending coil and descending coil perform control of the set value current using the ascending/descending signal sound in response to load fluctuations, and feedback control using the relative position signal. .

The above control may be performed only on one of the ascending coil and descending coil.

〔Effect of the invention〕

The present invention provides a control device for a moving coil type control rod drive device for a nuclear reactor, which includes a relative position detector for an electromagnetic coil and an electromagnetic plunger, and a load variation detector for a drive shaft, and a load variation detector for a drive shaft. If a fluctuation signal is sent to the ascending coil and descending coil control circuits of the control device to vary the set current value of the coils in accordance with the load, the deviation signal of the relative position detector may be caused. Since the coil current is configured to be feedback-controlled, the control range of the control device can be expanded and the control accuracy can be improved, which is an excellent effect.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a control device for a moving coil type control rod drive device for a nuclear reactor showing an embodiment of the present invention, and FIG.
bl・ is a diagram showing the control situation, m6 diagram, and FIG. 4 are the configuration diagrams of the conventional device, and FIG. , (2) is the drive shaft, (6) is the rising coil, (force is lower + *) Cocoil (8) is the electromagnetic plunger, (Company) is the electromagnetic coil assembly, (Foundation) is the electromagnetic plunger assembly, C301 is the motor Drive circuit, 01)
0 is a coil control circuit for raising, 0 is a coil control circuit for lowering, 0→ is a coil/plunger relative position detector, and 04) is a load fluctuation detector for the drive shaft. Agent Patent Attorney Sanro Kimura 4dah-1-1 Figure 5 Kuji (b) Shinhira

Claims (1)

[Claims] A control device for a moving coil type control rod drive device for a nuclear reactor is provided with a load variation detector for the drive shaft and a relative position detector for an electromagnetic coil and an electromagnetic plunger, and the control device adjusts the control device according to changes in the load on the drive shaft. It is configured to change the current in both or one of the ascending coil and descending coil, detect a deviation in the relative position between the electromagnetic coil and the electromagnetic plunger, and perform feedback control of the coil current using the deviation signal. A control device for a moving coil type control rod drive device, characterized in that: