SU1220014A1 - Device for checking control circuit of nuclear reactor - Google Patents

Description

122001A

2. The device according to claim, i, characterized in that the electronic model is made in the form of two series-connected resistors, connected between the input and output of the electronic model, and two condensations 1

The invention relates to the field of nuclear technology, to the means of automatic control and protection of nuclear reactors and can be used in regulators of neutron power of nuclear reactors.

The purpose of the invention is to increase the efficiency of control loop control by reducing the possibility of false alarms about failure.

FIG. A block diagram of the Control I device in FIG. 2 is a schematic diagram of an electronic model; in fig. 3 is a diagram of the sample-storage block i in FIG. 4 is a scheme of a controlled integrator; in FIG. 3, temporary diagrams e “d of operation of the device.

The control unit for the control of the nuclear reactor (FIG. 1) contains an electronic model I, the output of which is connected to the input of the relay unit 2, the output of which is connected to the first input of the first comparison element 3, the control input of the controlled integrator A and the control input of sampling unit 5 storage. The input and output of the sampling-storage unit are connected respectively to the first and second inputs of the second comparison element 6, the output 2 of which is connected through the amplifier 7 to the second input of the first comparison element 3. The output of the first comparison element 3 is connected to the controlled integrator 4, the output of which through the threshold element 8 is connected to the input of the detector 9. The electronic model i input and the input of the sampling-storage unit 5 are the first 10 and second P inputs, respectively which are connected respectively to the output of the control relay circuit

tori, first: from between the point of the first and the second and the common bus, and between the common bus of the electronic model.

control of the nuclear reactor and the output of the reverse period meter (not shown).

The electronic model models the inertial units located in the control loop, which includes a servo drive, a control rod, a reactor, a neutron flux detector, a logyrifmic amplifier, and a reverse period meter. The most significant influence on the delay of the response in the output signal of the inverse period meter is provided by the inertia of the drive and the inverse period meter. Therefore, the model has a transfer fraction of the form

20

W "(S)

one

(T, S + 1) ()

where T, is the drive time constant; Tj is the time constant of the inverse period meter.

The electronic model (FIG. 2) is made as a series connection of the first 12 and second 13 resistors connected between the input 1A and the output 15 of the electronic model, two capacitors, with the first capacitor 16 connected between the connection point of the first 12 and second 3 resistors and the common bus 17 and the second capacitor 18 is connected between the common bus 17 and the output 15 of the electronic model.

The device operates as follows (Fig. 5).

The relay control signal acts on the input of the electronic model I. From the output signal of the model 1, the relay unit 2 generates a pulse signal that controls the keys of the sample-storage unit 5 and the controlled integrator 4. When a pulse appears at the output of the relay unit 2, the unit key

3

Sample storage 5 is opened and at its output the voltage remains constant throughout the duration of the pulse. This voltage is equal to the voltage at the input of the sample-storage unit 5 at the time of the appearance of a pulse. At the output of the second comparison element 6, a signal is generated that deviates the current value of the inverse period from the random value, which was equal to the signal of the inverse period meter at the instant of occurrence at the output of the relay block 2. Sign (polarity) of the signal at the output of the second element 6 comparisons in case of control loop health will coincide with the sign (polarity) of the signal of the relay unit 2,

From the output of the second comparison element 6, the amplifier 7 generates a pulse signal that is subtracted from the output signal of the relay unit 2 in the first comparison element 3. Limit level (saturation

14L

neither) amplifier 7 is equal to the limit level of the relay unit 2. The unbalance signal at the output of the first comparison element 3 is integrated by the controlled integrator 4, which has a reset control input zero. If the change in the signal of the inverse period meter does not correspond to the signal of the control relay, the device generates a fault signal taken from the output of the threshold element 8.

The use of the invention improves the control efficiency of the nuclear reactor control circuit by eliminating the false positives of the threshold element associated with the effects of noise and other disturbing factors. The control is provided even with short duration control pulses, the response to which is comparable to the noise component at the output of the period meter, while the frequency of the control (the number of confirmed light reactions per unit time) is sharply increased.

/ e.

Claims (2)

1. DEVICE FOR CONTROL OF A NUCLEAR REACTOR CONTROL CIRCUIT, containing an electronic model, the input of which is the first input of the device, the first comparison element, a threshold element and a signaling device, the input of which is connected to the output of the threshold element, characterized in that, in order to increase the efficiency of the loop control control by reducing the possibility of false alarms about failure, a relay block, a fetch-storage block, a second comparison element, an amplifier and a controlled integrator are introduced into it, and the relay input is n of the second block is connected to the output of the electronic model, and the output is to the first input of the first comparison element, the control input of the sample-storage unit and the control input of the managed integrator, the input of the sample-storage unit is the second input of the device and connected to the first input of the second comparison element, the second input which is connected to the output of the sample-storage unit, and the output through the amplifier to the second input of the first comparison element, the input of the controlled integrator connected to the output of the first comparison element, and the output to the threshold input marketing item. SU. „, 1220014 2. The device according to π. 1, characterized in that the electronic model is made in the form of two series-connected resistors connected between the input and output of the electronic model, and two capacitors, the first of which is between the point of the first and second and the common bus, and between the common bus of the electronic model. which include connecting resistors to the second and output