JP2859486B2 - Automatic test equipment for control rod control equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic testing device for a control rod control device used for confirming the soundness of the control rod control device of a PWR type nuclear power plant.

[0002]

2. Description of the Related Art FIG. 2 shows, for example, Mitsubishi Electric Technical Report, Vol. 4
8, No. 11, P1300, is a block diagram showing a conventional control rod control device shown in "Full-length control rod control device". In the figure, reference numeral 1 denotes a logic cabinet, 2a, 2b,. A current command is input to a stationary jack gripper (hereinafter referred to as SG) coil, a movable gripper (hereinafter referred to as MG) coil and a lift (hereinafter referred to as LIFT) coil of a magnetic jack type control rod drive mechanism (hereinafter referred to as CRDM). It is a power cabinet composed of a plurality of cabinets for supplying a direct current.

Here, the SG coil functions to hold the control rod at a fixed position, and the MG coil functions to back up the control rod holding (backup of SG) and hold the control rod when driving the control rod. And the LIFT coil is M
Functions to pull up the G magnetic jack.

In the logic cabinet 1,
4n are slave cyclers provided corresponding to the power cabinets 2a, 2b,... 2n, 5a, 5b,... 5n are slave cyclers 4a, 4b,. I / OA (hereinafter referred to as I / OA)
The amplifier 6 (referred to as C) is a bank overlap for instructing which control rod group to operate.

Further, power cabinets 2a, 2b,
In 2n, 7 is a thyristor, 8 is a current detection resistor for detecting a current supplied to the CRDM coil 20, and 9 is a current control circuit for controlling the thyristor 7.

Next, the operation will be described. First, when an operation command and a speed signal from the reactor control system are input to the logic cabinet 1, the master cycler 3 starts cycling in accordance with the command and the bank overlap 6
Cycler 4 corresponding to bank select signal from
a, 4b,... 4n are generated.

[0007] These slave cyclers 4a, 4b,
4n starts cycling upon receiving the GO pulse, and the power cabinets 2a, 2b,.
5n are output through the / OAC amplifiers 5a, 5b,... 5n.

That is, FIG. 3 shows one sequence (1
SG during insertion / withdrawal operation in step 5/8 inch operation)
The current command of the coil, the MG coil, and the LIFT coil and the corresponding current waveform are shown, and the drive current, the holding current, and the zero current corresponding to the timing of {1 ′} and {0} of the 2-bit current command. Take three states, SG, MG
The control rod is driven by the gripping operation by the lift and the lifting operation by the lift of the MG.

The current control circuit 9 receives the current command pattern and sends a current control signal to the gate of the thyristor 7. Then, the current signal detected by the current detection resistor 8 is input, and feedback control is performed so that the CRDM coil current becomes constant.

[0010]

Since the conventional control rod control device is constructed as described above, the slave cyclers 4a, 4b,.
5n and the power control circuits 9 of the power cabinets 2a, 2b,... 2n fail, the current of the CRDM coil 20 becomes abnormal, the control rods fall, and the reactor stops. There was a problem.

In addition, the control rod hardly operates during normal operation, and a control rod drive test is performed once a month to check the soundness of the drive mechanism. There were problems such as the control rod falling.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. Before a control rod is actually operated, a test of a logic cabinet and a power cabinet is performed, and their soundness is safely confirmed. It is an object of the present invention to obtain an automatic test device for a control rod control device that can perform the test.

[0013]

An automatic test apparatus for a control rod control device according to the present invention starts cycling of a plurality of slave cyclers based on an operation command and a speed signal from a reactor control system by a logic cabinet.
Drives the slave cycler corresponding to bank select signals from the bank overlap, blocking the current command from the logic cabinet by a power cabinet, the timing of the current instruction for the control rod drive mechanism coil at this time to be measured, Pas current word cabinet control rod drive mechanism coil during testing to monitor whether reaches the predetermined value, the interlock circuit so as not to accept the current command from the logic cabinet by the workstation during the test logic cabinet After instructing, the slave cycler to be tested is instructed with respect to the bank overlap, the measurement data of the timing of the current command for the control rod drive mechanism coil is received, and whether or not each current command is output correctly is diagnosed. , Power cabinet trial After instructing the interlock circuit to accept a current instruction from the logic cabinet when instructs the current control rod drive mechanism coil from the holding current so as to rise to the driving current, the monitoring results of the specified value from the comparator The diagnosis is made.

[0014]

The automatic test equipment of the control rod control device according to the present invention.
The device is interlocked so that it does not actually operate during the test of the logic cabinet, and the timing of the current command to the control rod drive mechanism coil can be measured,
The soundness of the logic cabinet is automatically tested, and a comparator monitors whether or not the current of the control rod drive mechanism coil has reached a specified value when testing the power cabinet.

[0015]

【Example】

Embodiment 1 FIG. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 10 denotes an automatic test device of the control rod control device, and reference numeral 11 denotes a workstation for performing a man-machine interface, diagnosing test results, displaying and storing data, and is connected to the controller by RS-232C communication. Commands and test results are input to this controller.

Reference numeral 12 denotes the controller which controls a digital output circuit (hereinafter, referred to as D / O) 13 and an analog output circuit (hereinafter, referred to as A / O) 14 to generate a simulated input signal. In addition, an analog input circuit (hereinafter A / I
) And a digital input circuit (hereinafter referred to as D / I) 16 to input test results.

Reference numeral 17 denotes a logic analyzer connected to the workstation 11, which analyzes timing of high-speed signal data, sends data to the workstation 11 connected by GP-IB communication, and performs diagnosis. Do. In addition, power cabinet 2
In 2a, 2b,... 2n, reference numeral 18 denotes an interlock circuit which performs an interlock operation by the output of the D / O 13;
Is a comparator.

Next, the operation will be described. The logic cabinet 1 and the power cabinets 2a, 2b,... 2n are separately diagnosed according to the following procedure. First, when testing the logic cabinet 1, the workstation 1
1 based on a command to the D / O 13
2n through the interlock circuit 18 of the power cabinets 2a, 2b,... 2n, sends a command to the current control circuit 9 to block the current control circuit 9 from receiving the current command from the logic cabinet 1.

Thus, during the test of the logic cabinet 1, the current flowing through the CRDM coil 20 maintains the control rod holding state (holding current for the SG coil and MG coil, and zero current for the LIFT coil). During this time, the D / O 13 sends a bank selection signal to the bank overlap 6 to select any one of the slave cyclers 4a, 4b,.

Further, the controller 12 sends a speed signal from the A / O 14 to the master cycler 3, and the D / O
By transmitting an operation signal from the controller 13, the master cycler 3 and the slave cyclers 4a, 4b,.

At this time, the slave cyclers 4a and 4a
b,... 4n are input to the logic analyzer 17, and the SG coil, MG coil, LIF
The timing of the current command for the T coil is measured, and the measurement data is sent to the workstation 11. The workstation 11 diagnoses that each current command is output at a correct timing, and displays a diagnosis result.

Next, the power cabinets 2a, 2b,.
When diagnosing 2n, the interlock is released and a current command from the logic cabinet 1 is accepted. Next, the D / O 13 to the I / OAC amplifier 5a,
Power cabinets 2a, 2b, 5b,.
... A current command is sent to the 2n current control circuit 9 so that the currents of the SG coil and the MG coil rise from the holding current to the driving current.

At this time, the power cabinets 2a, 2
b,... 2n comparator 19 monitors the coil current of the CRDM coil 20, operates when the specified current as a reference value is reached, notifies the D / I 16 that the specified current has been reached,
Indicate that the power cabinets 2a, 2b,... 2n are sound.

The power cabinets 2a, 2b,... 2
n has a plurality of current control circuits 9 in one plane. To test all the current control circuits 9, from the D / O 13,
A bank selection signal is sent to the bank overlap 6,
Switch the current control circuit to be tested.

When a transient signal (an emergency operation request of a control rod for a sudden load change) from the reactor control system is input to the D / I 16, the automatic test apparatus 10 immediately cancels the test state and resets the reactor. Accepts operation commands from the control system.

Further, when the operator switches from automatic operation to manual operation using the bank selection switch from the reactor panel, D / D
Upon receipt of this, I16 immediately releases the test condition and allows manual control rod operation from the reactor panel.

The speed signal from the reactor control system is read by the A / I 15, the operation command is input by the D / I 16, and the logic analyzer 17 responds to the S
By measuring the timing of each current command of the G coil, the MG coil, and the LIFT coil, and inputting and monitoring the current state from the comparator 19 to the D / I 16, it is possible to diagnose the control rod controller online.

[0028]

As described above, according to the present invention, the logistics
Operation instructions from the reactor control system by the rack cabinet
And multiple slave cyclers based on speed signals
Start cycling and ban from the bank overlap
Drive the slave cycler corresponding to the
From the logic cabinet by the work cabinet
The current command is blocked and the control rod drive mechanism
The current command timing for the
Control rod drive mechanism coil
Monitors whether the current has reached the specified value.
When testing the logic cabinet,
So that it does not accept current commands from the
After instructing the interlock circuit,
Instruct the slave cycler to be tested
Measurement data of current command timing
The current command is output correctly.
Diagnosis during power cabinet testing.
Accept current command from logic cabinet
After instructing the interlock circuit, the control rod drive mechanism
So that the current of the coil rises from the holding current to the driving current
Command and diagnose the monitoring result of the specified value from the comparator.
Since it is configured such that, the test of the control rod control system, the control rods can be tested without actual operation, control before rod operation test by checking the soundness of the control circuit, the control rod There is an effect that a device that can prevent erroneous falling and improve the operation rate of the plant can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an automatic test device of a control rod control device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional control rod control device.

FIG. 3 is a timing chart showing a current pattern of the CRDM coil in FIGS. 1 and 2;

[Explanation of symbols]

 Reference Signs List 1 logic cabinet 2a, 2b,... 2n power cabinet 11 workstation 12 controller 13 D / O (digital output circuit) 14 A / O (analog output circuit) 15 A / I (analog input circuit) 16 D / I (digital input) Circuit) 17 Logic analyzer 18 Interlock circuit 19 Comparator 20 CRDM coil (Control rod drive mechanism coil)

Claims (1)

(57) [Claims] 1. A master cycler which starts cycling of a plurality of slave cyclers based on an operation command and a speed signal from a reactor control system, and drives the slave cycler corresponding to a bank selection signal from a bank overlap. Logic cabinet and multiple power supplies to supply DC current to control rod drive mechanism coils
Chromatography cabinet, blocking the current command from the logic cabinet, interlock circuit that can measure the timing of the current instruction for the control rod drive mechanism coil at this time, and the control rod in a test of the power cabinet A power cabinet having a comparator for monitoring whether or not the current of the drive mechanism coil has reached a specified value; and after instructing the interlock circuit not to accept a current command from the logic cabinet during the test of the logic cabinet, Instructing the slave cycler to be tested with respect to the bank overlap, receiving measurement data of a current command timing for the control rod driving mechanism coil, and diagnosing whether or not each of the current commands is correctly output. Along with the above power cabinet test Sometimes, after instructing the interlock circuit to accept a current command from the logic cabinet, instruct the control rod drive mechanism coil current to rise from the holding current to the driving current, and monitor the specified value from the comparator. An automatic testing device for a control rod control device comprising a workstation for diagnosing a result.