High-temperature gas cooled reactor primary loop instrument pipe isolation valve control circuit and power supply circuit

Abstract

The embodiment of the utility model provides a high-temperature gas cooled reactor primary loop instrument pipe isolation valve control and power supply circuit. The control circuit comprises an isolation control loop; the isolation control loop comprises a leakage protection switch and an isolation valve control module which are connected in series; the leakage protection switch is used for being closed when an instrument pipe leakage signal is received. The isolation valve control module is used for being electrically connected with an instrument pipe isolation valve, and when the isolation valve control module is powered on, the instrument pipe isolation valve is controlled to be closed. According to the embodiment of the invention, through serial arrangement of the valves and protection signal expansion of the relays, equipment investment of the protection system is reduced, meanwhile, certain redundancy is achieved, through independent design of a power supply of the isolation valves, electrical isolation of the isolation valves of all channels is achieved, enough redundancy is achieved for faults of a single instrument pipe, and the reliability of the system is improved. And the isolation function of the primary loop instrument pipe can be reliably realized.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the field of electrical technology, and specifically relate to a control circuit and a power supply circuit for a primary-loop instrument pipe isolation valve of a high-temperature gas-cooled reactor. Background Art

[0002] The high-temperature gas-cooled reactor uses helium as the primary coolant. The cold helium is driven by the primary main helium fan into the reactor pressure vessel, flows through the core and takes away the heat generated by the reactor. The helium heats the secondary feed water through the steam generator to generate steam, which drives the steam turbine to generate electricity. The cooled cold helium is sent back to the core by the main helium fan to form a closed cycle.

[0003] During the circulation of the primary helium coolant, the primary pressure, flow, humidity and other parameters must be monitored to prevent the change of parameters from endangering the safety of the reactor operation. The working process of the primary measuring instrument is to lead the primary helium coolant through the instrument pipe to the measuring instrument, and then return to the primary loop through the instrument pipe after passing through the measuring instrument. When the reactor has an instrument pipe damage and leakage accident, due to the small rupture, the coolant leaks slowly, and the negative change rate of the primary pressure is lower than the protection set value, resulting in the primary isolation function not being triggered. As the coolant leaks, the radioactivity in the instrument room will be abnormal, the instrument indication will be abnormal, the instrument parameters will be inaccurate and it will easily cause safety accidents. Utility Model Content

[0004] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide a control circuit and a power supply circuit for a primary-loop instrument pipe isolation valve of a high-temperature gas-cooled reactor.

[0005] One aspect of the present disclosure provides a control circuit for a primary-loop instrument pipe isolation valve of a high-temperature gas-cooled reactor, the control circuit comprising an isolation control circuit; the isolation control circuit comprising a leakage protection switch and an isolation valve control module connected in series;

[0006] The leakage protection switch is used to close when receiving an instrument pipe leakage signal; the isolation valve control module is used to be electrically connected to the instrument pipe isolation valve, and when the isolation valve control module is powered, the instrument pipe isolation valve is controlled to close; wherein,

[0007] The isolation valve control module includes a first control relay and a second control relay connected in parallel with each other; the first control relay is used to be electrically connected to the instrument pipe inlet isolation valve, and the second control relay is used to be electrically connected to the instrument pipe outlet isolation valve.

[0008] Furthermore, the control circuit further comprises a pressure loss alarm circuit; the pressure loss alarm circuit is connected in parallel with the isolation control circuit;

[0009] The pressure loss alarm circuit includes an alarm relay; the alarm relay is used to be electrically connected to the pressure loss alarm module, and when the alarm relay loses power, the pressure loss alarm module sends out an alarm.

[0010] Optionally, the pressure loss alarm module is a DCS.

[0011] Further, the control circuit also includes an instrument tube isolation indicator light;

[0012] The instrument tube isolation indicator light is connected in parallel with the first control relay and the second control relay respectively.

[0013] Furthermore, the control circuit also includes a pressure loss indicator light;

[0014] The pressure loss indicator light is connected in parallel to both ends of the isolation control loop.

[0015] Furthermore, the control circuit also includes a fuse;

[0016] The fuse is connected in series with the isolation control circuit.

[0017] Another aspect of the present disclosure provides a power supply circuit for a primary circuit instrument pipe isolation valve of a high temperature gas-cooled reactor, wherein the instrument pipe isolation valve comprises a first inlet isolation valve and a second inlet isolation valve arranged on an instrument inlet pipeline, and a first outlet isolation valve and a second outlet isolation valve arranged on an instrument outlet pipeline. The power supply circuit comprises a first safety bus, a second safety bus, a third safety bus, a fourth safety bus, and a first protection cabinet expansion drawer and a second protection cabinet expansion drawer;

[0018] The first inlet isolation valve is arranged on the first safety bus, the second inlet isolation valve is arranged on the second safety bus, the first outlet isolation valve is arranged on the third safety bus, and the second outlet isolation valve is arranged on the fourth safety bus; the first protection cabinet expansion drawer is arranged on the first safety bus or the third safety bus, and the second protection cabinet expansion drawer is arranged on the second safety bus or the fourth safety bus;

[0019] Each of the protection cabinet expansion drawers includes the control circuit described above; wherein, the control circuit in the first protection cabinet expansion drawer is electrically connected to the first inlet isolation valve and the first outlet isolation valve, respectively, and the control circuit in the second protection cabinet expansion drawer is electrically connected to the second inlet isolation valve and the second outlet isolation valve, respectively.

[0020] Furthermore, the power supply circuit also includes a first protection trigger cabinet and a second protection trigger cabinet;

[0021] The first protection cabinet extension drawer is arranged in the first protection trigger cabinet to receive the instrument tube leakage signal sent by the first protection trigger cabinet; the second protection cabinet extension drawer is arranged in the second protection trigger cabinet to receive the instrument tube leakage signal sent by the second protection trigger cabinet.

[0022] Furthermore, the power supply circuit further includes a first emergency bus and a second emergency bus;

[0023] The first emergency bus is used to supply power to the first safety bus and the third safety bus respectively; the second emergency bus is used to supply power to the second safety bus and the fourth safety bus respectively.

[0024] Further, the power supply circuit also includes a first uninterruptible power supply, a second uninterruptible power supply, a third uninterruptible power supply and a fourth uninterruptible power supply;

[0025] The first uninterruptible power supply is electrically connected to the first emergency bus and the first safety bus, respectively, the second uninterruptible power supply is electrically connected to the second emergency bus and the second safety bus, respectively, the third uninterruptible power supply is electrically connected to the first emergency bus and the third safety bus, respectively, and the fourth uninterruptible power supply is electrically connected to the second emergency bus and the fourth safety bus, respectively.

[0026] A control circuit and power supply circuit for a primary-loop instrument pipe isolation valve of a high-temperature gas-cooled reactor in an embodiment of the present disclosure reduces the investment in protection system equipment through the series arrangement of valves and the protection signal expansion of relays, and at the same time has a certain redundancy. In addition, through the independent design of the isolation valve power supply, the electrical isolation of the isolation valves of each channel is achieved, and there is sufficient redundancy for a single instrument pipe failure, so that the primary-loop instrument pipe isolation function can be reliably achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural schematic diagram of a control circuit for a primary-loop instrument pipe isolation valve of a high-temperature gas-cooled reactor according to an embodiment of the present disclosure;

[0028] Figure 2 This is a schematic structural diagram of a primary loop instrument tube for a high temperature gas-cooled reactor according to another embodiment of the present disclosure;

[0029] Figure 3 This is a structural schematic diagram of a power supply circuit for a primary-loop instrument pipe isolation valve of a high-temperature gas-cooled reactor according to another embodiment of the present disclosure;

[0030] Figure 4 This is a schematic diagram of the electrical connection relationship of the expansion drawers of each protection cabinet according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0031] The high-temperature gas-cooled reactor uses helium as the primary coolant. The cold helium is driven by the primary main helium fan into the reactor pressure vessel, flows through the core and takes away the heat generated by the reactor. The helium heats the secondary feed water through the steam generator to generate steam, which drives the steam turbine to generate electricity. The cooled cold helium is sent back to the core by the main helium fan to form a closed cycle.

[0032] During the circulation of the primary helium coolant, the primary pressure, flow, humidity and other parameters must be monitored to prevent the change of parameters from endangering the safety of the reactor operation. The working process of the primary measuring instrument is to lead the primary helium coolant through the instrument pipe to the measuring instrument, and then return to the primary loop through the instrument pipe after passing through the measuring instrument. When the reactor has an instrument pipe damage and leakage accident, the negative change rate of the primary pressure is lower than the protection set value. Since the breach is small, the coolant leaks slowly, and the primary isolation function will not be triggered. As the coolant leaks, some rooms have abnormal radioactivity and the instrument indication is abnormal. Therefore, when the instrument pipe leak is detected, it must be isolated in a timely and reliable manner to avoid leakage of the primary coolant.

[0033] In an existing high-temperature gas-cooled reactor, two series-connected electric isolation valves are respectively arranged on the inlet and outlet pipelines between the primary circuit measuring instruments, specifically including two inlet isolation valves and two outlet isolation valves. During normal operation, the isolation valve is opened to ensure the normal measurement function of the instrument. When the instrument pipe leaks, the isolation valve needs to be reliably closed to stop the coolant leakage and ensure the safety of the reactor.

[0034] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0035] In addition, the described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the present disclosure.

[0036] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0037] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another component. Therefore, the first component discussed below can be referred to as the second component without departing from the teachings of the concepts of the present disclosure. As used in this disclosure, the term "and / or" includes any one of the associated listed items and all combinations of one or more.

[0038] Those skilled in the art will appreciate that the drawings are merely schematic diagrams of example embodiments, and the modules or processes in the drawings are not necessarily necessary for implementing the present disclosure, and therefore cannot be used to limit the protection scope of the present disclosure.

[0039] like Figure 1 As shown, an embodiment of the present disclosure provides a control circuit for an instrument pipe isolation valve of a primary loop of a high-temperature gas-cooled reactor, the control circuit comprising an isolation control circuit 110. The isolation control circuit 110 comprises a leakage protection switch ST and an isolation valve control module 111 connected in series. The leakage protection switch ST is used to close when an instrument pipe leakage signal is received. The isolation valve control module 111 is used to be electrically connected to the instrument pipe isolation valve, and when the isolation valve control module 111 is powered, the instrument pipe isolation valve is controlled to be closed; wherein, the isolation valve control module 111 comprises a first control relay KA1 and a second control relay KA2 connected in parallel. The first control relay KA1 is used to be electrically connected to the instrument pipe inlet isolation valve, and the second control relay KA2 is used to be electrically connected to the instrument pipe outlet isolation valve.

[0040] Specifically, Figure 1 As shown, the main contact KA1-1 of the first control relay KA1 is connected in series to the power supply circuit 120 of the inlet isolation valve, and the main contact KA2-1 of the second control relay KA2 is connected in series to the power supply circuit 130 of the outlet isolation valve. The above main contacts are all normally open contacts. The primary instrument pipe isolation protection signal sent by the reactor protection system is connected to the leakage protection switch ST. When the instrument pipe leakage signal is received, the leakage protection switch ST is closed, and the isolation control circuit 110 is turned on. The first control relay KA1 and the second control relay KA2 are energized. After the instrument pipe leakage signal is expanded by relays KA1 and KA2, the corresponding normally open contacts respectively control the corresponding inlet and outlet isolation valves to close, thereby isolating the instrument pipe and blocking the leakage of the coolant.

[0041] It can be understood that the first control relay KA1 and the second control relay KA2 are only different in name or number. In some embodiments, the second control relay KA2 can be electrically connected to the inlet isolation valve of the instrument pipe, and the first control relay KA1 can be electrically connected to the outlet isolation valve of the instrument pipe. In addition, when there are two pairs of inlet isolation valves and outlet isolation valves at the two end pipelines of the instrument room (one inlet isolation valve and one outlet isolation valve are a pair), two identical control circuits can be set to control each pair of isolation valves respectively, providing sufficient redundancy and reliability to ensure that when the instrument pipe leaks, at least one of the isolation valves on the inlet and outlet instrument pipes can be closed, so as to reliably isolate the leak.

[0042] For example, Figure 1 As shown, the control circuit also includes a pressure loss alarm circuit 140. The pressure loss alarm circuit 140 is connected in parallel with the isolation control circuit 110. The pressure loss alarm circuit 140 includes an alarm relay KA3. The alarm relay KA3 is used to be electrically connected to a pressure loss alarm module such as a DCS, specifically to send its main contact KA3-1 to the power supply circuit 150 of the pressure loss alarm module. When the alarm relay KA3 loses power, it indicates that the control circuit of the isolation valve of the instrument pipe of the first circuit of the high-temperature gas-cooled reactor loses power (i.e., loses pressure). The pressure loss alarm module issues an alarm to remind the operating personnel to take measures to realize power supply monitoring of the isolation control circuit 110 to prevent the isolation function from being unavailable due to power failure.

[0043] For example, Figure 1 As shown, the control circuit also includes an instrument pipe isolation indicator light PG1. The instrument pipe isolation indicator light PG1 is connected in parallel with the first control relay KA1 and the second control relay KA2 respectively. When the instrument pipe is operating normally without leakage, the leakage protection switch ST is disconnected, the relays KA1 and KA2 lose power, and the isolation indicator light PG1 is not lit; when a leakage occurs in the instrument pipe of a circuit, the leakage protection switch ST is closed, the relays KA1 and KA2 are energized to control the isolation valve to close, and the isolation indicator light PG1 lights up, reminding the on-site operating personnel to start the isolation control circuit 110 and the instrument pipe of a circuit leaks.

[0044] For example, Figure 1 As shown, the control circuit also includes a pressure loss indicator light PG2. The pressure loss indicator light PG2 is connected in parallel to the two ends of the isolation control circuit 110. During normal operation, the isolation control circuit 110 is energized and the pressure loss indicator light PG2 is always on; when the isolation control circuit 110 loses power, the pressure loss indicator light PG2 goes out, reminding the on-site personnel that the power supply of the isolation valve control circuit of the primary instrument pipe of the high-temperature gas-cooled reactor is faulty.

[0045] For example, Figure 1As shown, the control circuit also includes a fuse FU. The fuse FU is connected in series with the isolation control circuit 110. Specifically, the fuse FU is connected in series to one end of the live wire of the instrument tube isolation valve control circuit of the first circuit of the high-temperature gas-cooled reactor. When the control circuit also includes the underpressure alarm circuit 140 or the instrument tube isolation indicator light PG2 in the above embodiment, the fuse FU is also connected in series with the above branches. According to the specific load conditions in the circuit, the fuse FU can be made of aluminum wire, copper wire, etc. When the circuit is overloaded or short-circuited, if the current in the circuit exceeds the rated current of the fuse FU, the fuse FU will be blown, thereby quickly cutting off the circuit to protect electrical components and personal safety.

[0046] A control circuit for a primary-loop instrument pipe isolation valve of a high-temperature gas-cooled reactor in an embodiment of the present disclosure reduces the investment in protection system equipment through the series arrangement of valves and the expansion of protection signals of relays. The system has a certain redundancy and can reliably implement the primary-loop instrument pipe isolation function. By monitoring the depressurization state of the control circuit, the isolation function is prevented from being unavailable due to power failure, thereby improving system reliability. The system has the advantages of good reliability, easy implementation, and low cost.

[0047] Another embodiment of the present disclosure provides a power supply circuit for a primary instrument pipe isolation valve of a high temperature gas-cooled reactor. Figure 2 As shown, taking the example of a high-temperature gas-cooled reactor 200 having four instrument rooms in one circuit, each of the instrument pipe isolation valves includes a first inlet isolation valve and a second inlet isolation valve arranged on the instrument inlet pipeline, and a first outlet isolation valve and a second outlet isolation valve arranged on the instrument outlet pipeline. Specifically, the four instrument rooms in one circuit are A, B, C, and D, respectively, wherein the inlet pipeline of instrument room A is connected in series with the first inlet isolation valve A1 and the second inlet isolation valve A2, and the outlet pipeline of instrument room A is connected in series with the first outlet isolation valve A3 and the second outlet isolation valve A4. Similarly, Figure 2 As shown, instrument rooms B, C, and D have the same inlet and outlet isolation valve settings.

[0048] like Figure 3As shown, the power supply circuit includes a first safety bus OBSA, a second safety bus OBSB, a third safety bus OBSC, a fourth safety bus OBSD, and a plurality of first protection cabinet extension drawers X and a plurality of second protection cabinet extension drawers Y. Each of the first inlet isolation valves A1, B1, C1, and D1 is arranged on the first safety bus OBSA, each of the second inlet isolation valves A2, B2, C2, and D2 is arranged on the second safety bus OBSB, each of the first outlet isolation valves A3, B3, C3, and D3 is arranged on the third safety bus OBSC, and each of the second outlet isolation valves A4, B4, C4, and D4 is arranged on the fourth safety bus OBSD. The first protection cabinet extension drawer X is arranged on the first safety bus OBSA or the third safety bus OBSC, and the second protection cabinet extension drawer Y is arranged on the second safety bus OBSB or the fourth safety bus OBSD.

[0049] Among them, Figure 4 As shown, the control circuit in each of the first protection cabinet expansion drawers X is electrically connected to the corresponding first inlet isolation valve and the corresponding first outlet isolation valve, and the control circuit in each of the second protection cabinet expansion drawers Y is electrically connected to the corresponding second inlet isolation valve and the corresponding second outlet isolation valve. For example, the control circuit in the first protection cabinet expansion drawer XA is electrically connected to the inlet isolation valve A1 and the outlet isolation valve A3, and the control circuit in the second protection cabinet expansion drawer YA is electrically connected to the inlet isolation valve A2 and the outlet isolation valve A4, and similarly, the control circuits in the remaining first protection cabinet expansion drawers XB, XC, XD and second protection cabinet expansion drawers YB, YC, YD are electrically connected. Figure 4 And so on for settings.

[0050] Obviously, the above-mentioned setting method can ensure that when any safety bus fails, there is at least one isolation valve and its control circuit on the pipelines at both ends of the inlet and outlet of each instrument room respectively, which are normally powered, so that when a leak occurs in the instrument pipe of a circuit, the valve can be reliably closed to isolate the leak from the rest of the circuit.

[0051] For example, Figure 4 As shown, the power supply circuit further includes a first protection trigger cabinet G1 and a second protection trigger cabinet G2. Each of the first protection cabinet extension drawers X is arranged in the first protection trigger cabinet G1 to receive the instrument tube leakage signal sent by the first protection trigger cabinet G1; each of the second protection cabinet extension drawers Y is arranged in the second protection trigger cabinet G2 to receive the instrument tube leakage signal sent by the second protection trigger cabinet G2.

[0052] Specifically, the leakage signal of the primary circuit instrument pipe of the high temperature gas-cooled reactor protection system is sent through two independent protection trigger cabinets G1 and G2. Each protection trigger cabinet sends protection signals of four channels a, b, c, and d. The protection signal of each channel drives a pair of isolation valves (one inlet isolation valve and one outlet isolation valve) through the corresponding extension drawer to ensure reliable isolation of the instrument pipe. When a leakage occurs in an instrument pipe of the primary circuit of the high temperature gas-cooled reactor, the first protection trigger cabinet G1 and the second protection trigger cabinet G2 simultaneously send leakage signals of the instrument pipe of the corresponding channel. The signal is sent to the isolation valve after being extended by the corresponding extension drawer, and the isolation valve is driven to close, so as to realize the isolation function of the leaking instrument pipe. For example, when a leakage occurs in the instrument pipe of the instrument room A, the a channel signal sent by the safety trigger cabinet G1 is extended by the protection cabinet extension drawer XA to control the isolation valves A1 and A3 to close, and the a channel signal sent by the safety trigger cabinet G2 is extended by the extension drawer YA to control the isolation valves A2 and A4 to close. Similarly, when the instrument pipes in the instrument rooms B, C, and D leak, the first protection trigger cabinet G1 and the second protection trigger cabinet G2 simultaneously send out protection signals for the b, c, and d channels respectively, driving the corresponding pair of isolation valves to close.

[0053] For example, Figure 3 As shown, the power supply circuit further includes a first emergency bus OBNA and a second emergency bus OBNB. The first emergency bus OBNA is used to supply power to the first safety bus OBSA and the third safety bus OBSC respectively; the second emergency bus OBNB is used to supply power to the second safety bus OBSB and the fourth safety bus OBSD respectively.

[0054] Specifically, the first safety bus OBSA and the third safety bus OBSC are connected to the first emergency bus OBNA, and are both powered by the first emergency bus OBNA; the second safety bus OBSB and the fourth safety bus OBSD are connected to the second emergency bus OBNB, and are both powered by the second emergency bus OBNB. The first safety bus OBSA and the third safety bus OBSC supply power to the expansion drawer X of each of the first protection cabinets, and the second safety bus OBSB and the fourth safety bus OBSD supply power to the expansion drawer Y of each of the second protection cabinets. Specifically, Figure 3 The first safety bus OBSA supplies power to the expansion drawers XA and XB, the third safety bus OBSC supplies power to the expansion drawers XC and XD, the second safety bus OBSB supplies power to the expansion drawers YA and YB, and the fourth safety bus OBSD supplies power to the expansion drawers YC and YD.

[0055] According to the power supply circuit arranged in the above manner, when any emergency bus fails, the other emergency bus that has not failed can ensure that there is still a pair of controllable isolation valves at both ends of the inlet and outlet of each primary circuit instrument pipe to complete the isolation operation in case of leakage.

[0056] For example, Figure 3 As shown, the power supply circuit also includes a first uninterruptible power supply UPS1, a second uninterruptible power supply UPS2, a third uninterruptible power supply UPS3 and a fourth uninterruptible power supply UPS4. The first uninterruptible power supply UPS1 is electrically connected to the first emergency bus OBNA and the first safety bus OBSA respectively, the second uninterruptible power supply UPS2 is electrically connected to the second emergency bus OBNB and the second safety bus OBSB respectively, the third uninterruptible power supply UPS3 is electrically connected to the first emergency bus OBNA and the third safety bus OBSC respectively, and the fourth uninterruptible power supply UPS4 is electrically connected to the second emergency bus OBNB and the fourth safety bus OBSD respectively.

[0057] An uninterruptible power supply is installed between each safety bus and its upstream emergency bus, so that each safety bus can maintain power supply for a certain period of time after the corresponding upstream emergency bus fails, ensuring that electrical equipment can continue to operate for a period of time during a power outage, preventing damage to load electrical equipment caused by sudden power outages, and protecting electrical equipment from overcurrent, overvoltage and other hazards. At the same time, a stable voltage output is maintained through rectifiers and inverters, avoiding the impact of power fluctuations on equipment, improving power quality, and enhancing the reliability of the power system.

[0058] A power supply circuit for a primary-loop instrument pipe isolation valve of a high-temperature gas-cooled reactor in an embodiment of the present disclosure realizes electrical isolation of isolation valves of each channel by independently designing a power supply for the isolation valve, has sufficient redundancy for a single instrument pipe failure, and can reliably realize the primary-loop instrument pipe isolation function; by monitoring the depressurization state of the protection cabinet extension drawer control circuit, the isolation function is prevented from being unavailable due to power failure, thereby improving system reliability, and having the advantages of good reliability, easy implementation, and low cost.

[0059] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A control circuit for a primary-loop instrument pipe isolation valve of a high-temperature gas-cooled reactor, characterized in that: The control circuit includes an isolation control loop; the isolation control loop includes a leakage protection switch and an isolation valve control module connected in series; The leakage protection switch is used to close when receiving an instrument pipe leakage signal; the isolation valve control module is used to be electrically connected to the instrument pipe isolation valve, and when the isolation valve control module is powered, the instrument pipe isolation valve is controlled to close; wherein, The isolation valve control module includes a first control relay and a second control relay connected in parallel with each other; the first control relay is used to be electrically connected to the instrument pipe inlet isolation valve, and the second control relay is used to be electrically connected to the instrument pipe outlet isolation valve.

2. The control circuit according to claim 1, characterized in that: The control circuit also includes a pressure loss alarm circuit; the pressure loss alarm circuit is connected in parallel with the isolation control circuit; The pressure loss alarm circuit includes an alarm relay; the alarm relay is used to be electrically connected to the pressure loss alarm module, and when the alarm relay loses power, the pressure loss alarm module sends out an alarm.

3. The control circuit according to claim 2, characterized in that: The decompression alarm module is a DCS.

4. The control circuit according to any one of claims 1 to 3, characterized in that: The control circuit also includes an instrument tube isolation indicator light; The instrument tube isolation indicator light is connected in parallel with the first control relay and the second control relay respectively.

5. The control circuit according to any one of claims 1 to 3, characterized in that: The control circuit also includes a pressure loss indicator light; The pressure loss indicator light is connected in parallel to both ends of the isolation control loop.

6. The control circuit according to any one of claims 1 to 3, characterized in that: The control circuit also includes a fuse; The fuse is connected in series with the isolation control circuit.

7. A power supply circuit for a primary-loop instrument pipe isolation valve of a high-temperature gas-cooled reactor, wherein the instrument pipe isolation valve comprises a first inlet isolation valve and a second inlet isolation valve arranged on an instrument inlet pipeline and a first outlet isolation valve and a second outlet isolation valve arranged on an instrument outlet pipeline, characterized in that: The power supply circuit includes a first safety bus, a second safety bus, a third safety bus, a fourth safety bus, and a first protection cabinet expansion drawer and a second protection cabinet expansion drawer; The first inlet isolation valve is arranged on the first safety bus, the second inlet isolation valve is arranged on the second safety bus, the first outlet isolation valve is arranged on the third safety bus, and the second outlet isolation valve is arranged on the fourth safety bus; the first protection cabinet expansion drawer is arranged on the first safety bus or the third safety bus, and the second protection cabinet expansion drawer is arranged on the second safety bus or the fourth safety bus; Each of the protection cabinet expansion drawers includes the control circuit described in any one of claims 1 to 6; wherein the control circuit in the first protection cabinet expansion drawer is electrically connected to the first inlet isolation valve and the first outlet isolation valve, respectively, and the control circuit in the second protection cabinet expansion drawer is electrically connected to the second inlet isolation valve and the second outlet isolation valve, respectively.

8. The power supply circuit according to claim 7, characterized in that: The power supply circuit also includes a first protection trigger cabinet and a second protection trigger cabinet; The first protection cabinet extension drawer is arranged in the first protection trigger cabinet to receive the instrument tube leakage signal sent by the first protection trigger cabinet; the second protection cabinet extension drawer is arranged in the second protection trigger cabinet to receive the instrument tube leakage signal sent by the second protection trigger cabinet.

9. The power supply circuit according to claim 7 or 8, characterized in that: The power supply circuit also includes a first emergency bus and a second emergency bus; The first emergency bus is used to supply power to the first safety bus and the third safety bus respectively; the second emergency bus is used to supply power to the second safety bus and the fourth safety bus respectively.

10. The power supply circuit according to claim 9, characterized in that: The power supply circuit also includes a first uninterruptible power supply, a second uninterruptible power supply, a third uninterruptible power supply and a fourth uninterruptible power supply; The first uninterruptible power supply is electrically connected to the first emergency bus and the first safety bus, respectively, the second uninterruptible power supply is electrically connected to the second emergency bus and the second safety bus, respectively, the third uninterruptible power supply is electrically connected to the first emergency bus and the third safety bus, respectively, and the fourth uninterruptible power supply is electrically connected to the second emergency bus and the fourth safety bus, respectively.

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