SU1552032A1 - Device for detecting leakage - Google Patents

Abstract

This invention relates to the investigation and analysis of objects emitting acoustic energy. The purpose of the invention is to improve the noise immunity and reliability of leak detection in the steam generators of nuclear reactors by maintaining a predetermined average value of the informative parameter. The device comprises a control unit 1, a unit 2 acoustic transducers, a switching unit 3, a amplification, filtering and shaping unit 4, a correlation function determining unit 5 and an informative parameter associated with it, an alarm generation unit 6 and an alarm signaling unit 7. The block 5 for determining the correlation function and the informative parameter associated with it contains a block for generating a sign signal, a temporal node of the shift register, blocks for comparing characters, a block for determining the direction of counting, reversible counters, multiplexers, comparison nodes, a decoder, elements AND, elements OR , trigger and delay node. The device corrects the values of the time shifts used to determine the informative parameter. 2 Il.

Description

The invention relates to the field of research and analysis of objects emitting acoustic energy, and the model can be used to detect the emergency condition of the pipes of steam reactors of nuclear reactors with a liquid-metal coolant that occurs when water flows into sodium.

The aim of the invention is to improve ™ the noise immunity and reliability of leak detection by maintaining a predetermined average value of the informative parameter.

FIG. 1 is a block diagram of a leak detection device; in fig. 2 is a block diagram of a block for determining a correlation function and an informative parameter associated with it.

The device for detecting a leakage comprises a control unit 1, a series of acoustic transducer unit 2, a switching unit 3, a gain unit 4, filtering and shaping, a correlation function determining unit 5 and an informative parameter associated with it, a signal generation unit 6 alarms and alarm block 7.

Block 5 for determining the correlation function and the informative parameter associated with it contains serially connected block 8 of generating a sign signal, time sampling unit 9, the second input of which is connected to the first output of control unit 1, and the shift register 10, the second input of which is connected to the second output block 1 control, first 11

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and the second 12 character comparison blocks, the first inputs of which are connected to the first output of the shift register 10, the counting direction determination unit 13, the first and second inputs of which are connected respectively to the outputs of the first 1 1 and second 12 character comparison blocks, and the first reversible counter 14, the first and the second inputs of which are connected respectively to the first and second outputs of the counting direction determination unit 13, the third input of which is connected to the third output of the control unit 1, the first multiplexer 15, the first, second, third and fourth inputs which are connected respectively to the second, third, fourth and fifth outputs of the shift register 10, and the output to the second input of the first character comparison unit 11, the second multiplexer 16, the first, second, third and fourth inputs of which are connected respectively to the sixth, seventh , the eighth and ninth outputs of the shift register 10, and the output to the second input of the second character comparison unit 12, the first 17 and second 18 comparison nodes, the first inputs of which are the inputs of the reference values of the informative parameter, and the second connected to the output of the first reverse counter 14, the decoder 19, the address input of which is connected to the eighth output of the control unit 1, and the control input to the ninth output of the control unit 1, the first 20 and second 21 And elements, the first of which are connected respectively to the outputs of the first 17 and second 18 knots

51552032

comparison, the first element OR 22, the first and second inputs of which are connected respectively to the outputs of the first 17 and second 18 comparison nodes, the first 23, second 24, third 25, fourth 27 and sixth 28 triggers, informational D-inputs of which are connected to the output of the first the element OR 22, and the synchronization inputs C, respectively, with the first, second, third, fourth, fifth and sixth outputs of the decoder 19, the delay node 29, whose input is connected to the sixth output of the decrypt 10

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The unit for determining the correlation function and the associated parameter associated with it works as follows.

Formed by block 8, the sign signal arrives at node 9 of time sampling, from the output of which the selection of a sign signal with a period T having a rigidly fixed value is fed to the input of the shift register 10. On the first inputs of the first 11 and second 12 blocks of comparison of characters from the first output of the register 10 shift

rator 19, the second element OR 30, per- | 5 comes the value of the shift at the point

20

the left input of which is connected to the output of the delay node 29, the second input Reset to the ninth output of the control unit 1, and the output to the R inputs of the flip-flop triggers 23-28, the third element And 31, the first, second, third, fourth, fifth and The sixth inputs of which are connected respectively to the outputs of the flip-flops 23-28, and the output to the second inputs of the first 20 and second 21 elements And, the second 25 reversible counter 32, the direct and inverse inputs of which are connected respectively to the outputs of the first 20 and second 21 elements And, input Reset with the ninth output of control block 1 and the second input m second OR gate 30, and output - with address inputs, respectively the first 15 and second 16 multiplexers.

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G 0 axis of time shifts. From the outputs of the first 15 and second 16 multiplexers, the time inputs of the autocorrelation function at two points arrive at the second inputs of the first and second 12 comparison blocks and are used to determine a value proportional to the tangent of the angle of the sign carrelation function. This value is determined using the block 13 for determining the counting direction and the first reversible counter 14, from the output of which is also the output of the block 5 for determining the correlation function and the information parameter associated with it, it goes to the left inputs of the first 17 and the second 18 comparison nodes, to the first inputs to which the reference values of the informative parameter are received, which specify the limits of variation of this parameter in the nominal operation mode of the steam generator. The reference value codes are set with the help of supplying logic levels O (earth potential) and 1 (by connecting via a resistor with a + 5V source). By the first comparison node 17, the current value of the informative parameter is compared with the lower limit. If the parameter value of the standard is less than the specified lower limit value, the output of the Less first comparison node 17, made 50 for example, on 555C series microcircuits, receives a signal at the first input of the element 20 and the first input of the element 22 the current value of the informative meter pair is compared with the upper limit If the parameter value becomes greater than the specified upper limit value, from the output of the More than the second comparison node 18 to the first input

The device works as follows.

Acoustic noise of the steam generator is converted into electrical signals using acoustic transducers of block 2. In block 3, the electrical signals of the high-frequency spectrum are switched from acoustic transducers and in block 4 they are amplified and shaped. In block 8, a sign signal is formed, the value of the sign autocorrelation function of the acoustic noise converted into electrical signals is determined at two given points and the value of the tangent of the angle of inclination of the sign autocorrelation function in block 5 is determined, the value of the tangent of the angle of inclination of the sign autocorrelation function is determined with the specified settings in block 6 and when the monitored parameter goes beyond the limits of the settings, turn on the alarm in block 7 and conclude that there is a leak.

| 5 comes the value of the shift at the point

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G 0 axis of time shifts. From the outputs of the first 15 and second 16 multiplexers, the time inputs of the autocorrelation function at two points arrive at the second inputs of the first 11 and second 12 character comparison blocks and are used to determine a value proportional to the slope of the sign autocorrelation function. This value is determined using the counting direction determination unit 13 and the first reversible counter 14, from the output of which is also the output of the correlation function determining unit 5 and the informative parameter associated with it, it goes to the second inputs of the first 17 and second 18 comparison nodes, the first inputs of which receive the reference values of the informative parameter, which define the limits of variation of this parameter in the nominal operation mode of the steam generator. Reference value codes are set by supplying logic levels O (Earth potential) and 1 (by connecting through a resistor to a + 5V source). The first comparison node 17 compares the current value of the informative parameter with the lower limit. If the parameter value becomes less than the specified lower limit value, the output Less than the first comparison node 17, made, for example, on 555SP1 series microcircuits, receives a signal at the first input of the AND 20 element and at the first input of the OR 22 element, the second comparison node 18 of the current value the informative parameter is compared with the upper limit. If the parameter value becomes greater than the specified upper limit value, from the output More than the second comparison node 18 to the first input

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the second element And 21 and the second input of the first element OR 22 receives a signal. When a logical 1 signal arrives at any of the inputs of the first element OR 22, indicating the output of the informative parameter beyond the specified limits, the signal of logical 1 is output from the output of the first element OR 22 to the informative inputs of D-flip-flops 23-28, which are reset Reset, coming from the ninth output of control block 1. During the sequential polling of the acoustic transducers, the address to the decoder code | 19 A signal is received from the eighth output of the control unit 1, which is decrypted. From the outputs of the decoder 19 to the C-inputs of the synchronizer-flip-flops 23-28, signals are received sequentially in time allowing the recording of the logical 1, which is sent to the informative inputs of the D-trigger 23-28. Thus, on the trigger 23-28, an event is recorded that is beyond the specified F & i.e., the limits of the current value of the information parameter, which determines the average for each sensor during the cycle-30 of a polling of acoustic transducers.

The decoder 19 is supplied with the addresses of the sensors in the same way reacting to non-stationary changes in the modes of the steam generator, accompanied by a decrease or increase in the noise level, leading to a change in the shape of the spectrum and, therefore, to a change in the 4Q slope of the initial portion of the correlation function and a change an informative parameter depending on the correlation function. If during the polling cycle of all sensors on 45 all triggers 23-28, the informative parameter was set to exceed the limits set for the nominal mode of operation of the steam generator, this means that the reboot mode of the steam generator has changed. At the same time, the inputs of the third element I 31 from the outputs of the flip-flops 23-28 receive signals of logic level 1, and from the output of the third element 31, the second inputs of the first 20 and second 21 elements receive a signal of logic 1. If the state 1 is not set all triggers are 23-28, then it can serv51520328

There is evidence of the reaction of the informative parameter to short-term unsteady variations in the noise of steam generators associated with various unsteady technological disturbances. In the process of sequential polling of sensors when a signal appears at the sixth output of the decoder 19, this signal, passing through the delay node 29, goes to the first input of the second element OR 30 and from its output to the R-inputs of resetting the flip-flops 23-28, sets them to their original state the

The signal level of logical 1, which arrives at the second inputs of the first 20 and second 21 elements And, allows the passage of signals to their first inputs. Then, these signals come from the outputs of the first 20 and second 21 elements AND, respectively, to the direct and inverse inputs of the second reversible counter 32, increasing or decreasing its contents by one. The initial state of the counter 32 is set by the Reset signal received at its input from the ninth output of the control unit 1. The code from the output of the second reversible counter 32 is supplied to the address inputs of the first 15 and second 16 multiplexers. Address sets the multiplexer channels

15 and 16. Depending on the address to one of the inputs of the multiplexers 15 and

16 are received from the shift register 10 and pass to the outputs of the multiplexers 15 and 16 the corresponding delay values, which ensure the determination of the informative parameter

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such is its value, which does not go beyond the specified limits in all modes of operation of the steam generator.

The proposed device provides the ability to detect non-stationary changes in the noise of a steam generator when their operating modes change, resulting in a decrease or increase in noise power and a change in the shape of the spectrum and the slope of the initial portion of the sign autocorrelation function, and also allows the correlation of the time shift values used to determine informative parameter.

Form, L and Invention 1

A leak detection device comprising a control unit, subsequently

such is its value, which does not go beyond the specified limits in all modes of operation of the steam generator.

The proposed device provides the ability to detect non-stationary changes in the noise of a steam generator when their operating modes change, resulting in a decrease or increase in noise power and a change in the shape of the spectrum and the slope of the initial portion of the sign autocorrelation function, and also allows the correlation of the time shift values used to determine informative parameter.

Form, L and Invention 1

A device for detecting a leak containing a control unit, a series-connected acoustic transducer unit, a switching unit, a gain, filtering and shaping unit, a correlation function determining unit and an associated parameter associated with it, including a serially forming sign-forming unit, a time discretization unit , the second input of which is connected to the first output of the control unit, and the shift register, the second input of which is connected to the second output of the control unit, the first and The second is a symbol comparison unit, the first inputs of which are connected to the first output of the shift register, the counting direction determination unit, the first and second inputs of which are connected respectively

Respectively with the outputs of the first and second character comparison units, and the first reversible counter, the first and second inputs of which are connected respectively to the first and second outputs of the counting direction determination unit, and the third input of which is connected to the third output of the control unit, the alarm generation unit, whose inputs connected to the fourth, fifth, sixth and seventh outputs of the control unit, and an alarm unit, and the second input of the switching unit is connected to the seventh output of the control unit, characterized in that to improve noise immunity and reliability, the block for determining the correlation function and the informative parameter associated with it includes the first

35 output of the second element OR, and outputs (the outputs are connected respectively to the first, second, third, fourth, fifth and sixth inputs of the third element I, the output of which is connected to the second second multiplexers, the first and second inputs the first and second aleroi comparison nodes, the decoder, the first, second and third elements AND, the first and second elements OR, the first, second, third, fourth, fifth and sixth triggers, the delay node and the second reversible counter, and the first, second , the third and fourth inputs of the first multiplexer are connected respectively correspondingly with the second, third, and And outputs, the outputs of which are connected respectively to the direct and inverse inputs of the second reversible counter, the reset input of which is connected to the 45th tenth output of the control unit and the second input of the second OR element, the first input of which is connected to the output 1 the delay node, the input of which is connected to the sixth output of the decoder

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The twist and fifth shifts of the shift register; the first, second, third and fourth inputs of the second multiplexer are connected to the sixth, seventh, eighth and ninth outputs of the shift register, respectively; the outputs of the first and second multiplexers are connected to the second inputs of the first and second blocks, respectively comparison, and the address inputs are connected to the output of the second reversible counter, the first inputs of the first and second comparison nodes are the inputs of the reference values of the informative parameter, and the second inputs are connected to the output of the first second down counter, comparing the first output node connected to first inputs of the first AND element and the first

0 of the OR element, the second input of which is connected to the output of the second comparison node and the first input of the second element AND, the address input of the decoder is connected to the eighth output of the control unit, the control input of the decoder is connected to the ninth output of the control unit, and the first, second, third, the fourth, fifth and sixth outputs are connected respectively to the inputs

0 synchronization of the first, second, third, fourth, fifth, and sixth triggers, whose information inputs are connected to the output of the first OR element, the reset inputs are connected to

5 output of the second element OR, and outputs (the turns are connected respectively to the first, second, third, fourth, fifth and sixth inputs of the third element AND, the output of which is connected to the second inputs of the first and second elements AND, the outputs of which are connected correspondingly with the direct and inverse inputs of the second reversible counter, the reset input of which is connected to the tenth output of the control unit and the second input of the second OR element, the first input of which is connected to the output of the delay unit whose input is connected to the sixth output of the decoder.

Claims (1)

A leak detection device comprising a control unit, subsequently connected ⁹ acoustic transducers block, a switching unit, a gain, filtering and generating unit, a correlation function determination unit and an informative parameter associated with it, including a sign signal generating unit connected in series, a sampling unit in time, the second input jq of which is connected to the first output of the control unit, and the shift register, the second input of which is connected to the second output of the control unit, the first the first and second character comparison units, the first 15 inputs of which are connected to the first output of the shift register, the counter direction determination unit, the first and second inputs of which are connected respectively to the outputs of the first and second to 20th character comparison units, and the first reversible counter, the first and the second inputs of which are connected respectively to the first and second outputs of the yapod direction determination unit 25 of the account, and the third input of which is connected to the third output of the control unit, an alarm generating unit, the inputs of which are connected to the four the fifth, fifth, sixth and seventh outputs of the control unit, and an alarm signaling unit, and the second input of the switching unit is connected to the seventh output of the control unit, characterized in that, in order to increase the noise immunity and reliability, the correlation determination unit function and associated informative parameter includes the first and second multiplexers, the first and second ed nodes of comparison, the decoder, the first, second and third elements of AND, the first and second elements of OR, the first, second, third, fourth, fifth and < sixth triggers, bonds There were delays and a second reverse counter, moreover, the first, second, third and fourth inputs of the first multiplexer are connected respectively to the second, third, fourth and fifth outputs of the shift register, the first, second, third and fourth inputs of the second multiplexer are connected respectively the sixth, seventh, eighth and ninth re outputs; . shift shear, the outputs of the first and second multiplexers are connected respectively to the second inputs of the first and second character comparison units, and the address inputs are connected to the output of the second reversible counter, the first inputs of the first and second comparison nodes are inputs of the reference values of the informative parameter, and the second inputs are connected to the output the first reversible counter, the output of the first comparison node is connected to the first inputs of the first AND element and the first OR element, the second input of which is connected to the output of the second node the first input of the second element AND, the address input of the decoder is connected to the eighth output of the control unit, the control input of the decoder is connected to the ninth output of the control unit, and the first, second, third, fourth, fifth and sixth outputs are connected respectively to the synchronization inputs of the first, second, third, fourth, fifth and sixth triggers, the information inputs of which are connected to the output of the first OR element, the reset inputs are connected to the ^ output of the second OR element, and the outputs are connected respectively to the first, second, tr the fourth, fifth and sixth inputs of the third AND element, the output of which is connected to the second inputs of the first and second AND elements, the outputs of which are connected respectively to the direct and inverse inputs of the second reversible counter, the reset input of which is connected to the tenth output of the control unit and the second input of the second element OR 'the first input of which is connected to the output' of the delay node, the input of which is connected to the sixth output of the decoder.