An automatic control system for multi-module atmospheric release valves in a sodium-cooled fast reactor

Abstract

This invention specifically relates to an automatic control system for a multi-module atmospheric release valve in a sodium-cooled fast reactor, comprising: a switching module for selecting either a single-unit setting mode or an overall setting mode for the atmospheric release valve in automatic control mode; an overall setting station for setting the overall pressure setting value of the atmospheric release valve; a single-unit setting station for setting the pressure setting value of the atmospheric release valve individually; a pressure setting switching module for sending the single-unit or overall setting value of the atmospheric release valve pressure to a PID controller based on the pressure setting mode selection signal; and a PID controller for controlling the opening degree of the corresponding atmospheric release valve based on the difference between the overall or single-unit setting value of the corresponding atmospheric release valve pressure and the field measurement value. This invention achieves rapid response of the atmospheric release valve and effectively leverages its overpressure protection function for the steam generator.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant commissioning and operation and maintenance technology, and in particular to an automatic control system for a multi-module atmospheric release valve of a sodium-cooled fast reactor. Background Technology

[0002] The main steam system of the sodium-cooled fast reactor (NSCRT) is responsible for overpressure protection of the steam generators. When the pressure in the main steam system rises, the turbine bypass valve, atmospheric release valve, and safety valve are opened sequentially to ensure the safety of the steam generators. The NSCRT reactor building houses 16 steam generators, each with two atmospheric release valves on its main steam pipeline. Under normal operating conditions, the atmospheric release valves are closed. When the condenser vacuum is disrupted and the turbine bypass system becomes uncontrollable, the atmospheric release valves must be opened immediately to release steam and remove residual heat from the reactor and coolant after shutdown.

[0003] The current atmospheric relief valve pressure setting mode of sodium-cooled fast reactors is a single-unit setting mode. When the turbine bypass system loses control, due to the large number of atmospheric relief valves in the sodium-cooled fast reactor, modifying the pressure setting value of each atmospheric relief valve is inefficient and will cause the atmospheric relief valves to fail to respond quickly, thus failing to effectively play the role of atmospheric relief valves in protecting the steam generator from overpressure. Summary of the Invention

[0004] To address the issue that the atmospheric release valve pressure setting mode in sodium-cooled fast reactors (NSCRs) uses a single-valve setting mode, which is inefficient and results in slow response times for the numerous atmospheric release valves when the turbine bypass system loses control, thus failing to effectively protect the steam generator from overpressure, a multi-module automatic control system for atmospheric release valves in NCRs is proposed. This system retains the original single-valve setting mode but adds an overall setting mode. When the turbine bypass system loses control, the system switches to overall setting mode to set the pressure of multiple atmospheric release valves collectively, improving the efficiency of pressure setting and enabling rapid response, thereby effectively protecting the steam generator from overpressure. After the atmospheric release valve pressure stabilizes at the overall set value, the system switches back to single-valve setting mode. The switching between single-valve and overall setting modes is seamless.

[0005] To address the aforementioned issues, this invention provides an automatic control system for multi-module atmospheric release valves in a sodium-cooled fast reactor, comprising a switching module, an individual setpoint station, an overall setpoint station, a pressure setting switching module, and a PID controller. The atmospheric release valves are divided into one or more groups, with one group of atmospheric release valves corresponding to one switching module and one overall setpoint station, and one atmospheric release valve corresponding to one individual setpoint station, one pressure setting switching module, and one PID controller.

[0006] The switching module is equipped with a switching button. When the corresponding group of atmospheric relief valves is in automatic control mode, the pressure setting mode selection signal of the corresponding group of atmospheric relief valves is generated and sent to the pressure setting switching module of each atmospheric relief valve in the corresponding group according to the operator's selection of the pressure setting mode of the corresponding group of atmospheric relief valves, which is either individual setting mode or overall setting mode.

[0007] The overall setting station is used by the operator to set the pressure setting value of each atmospheric relief valve in the corresponding group as a whole, obtain the overall pressure setting value of each atmospheric relief valve in the corresponding group and send it to the pressure setting switching module of each atmospheric relief valve in the corresponding group.

[0008] The individual setting station is used by the operator to set the pressure setting value of the corresponding atmospheric relief valve, obtain the individual setting value of the corresponding atmospheric relief valve pressure, and send it to the pressure setting switching module of the corresponding atmospheric relief valve.

[0009] The pressure setting switching module is used to send the individual or overall pressure setting value of the corresponding atmospheric relief valve to the PID of the corresponding atmospheric relief valve according to the pressure setting mode selection signal of the corresponding group of atmospheric relief valves.

[0010] PID is used to control the opening degree of the corresponding atmospheric relief valve based on the difference between the overall set value or individual set value of the corresponding atmospheric relief valve pressure and the field measurement value.

[0011] In this invention, the switching module is equipped with a switching button and an RS trigger connected to the output of the switching button. The switching button is equipped with a single-unit setting mode and an overall setting mode.

[0012] When the operator clicks the overall setting mode on the switch button, the S terminal of the RS trigger connected to the switch button is set, and the RS trigger sends a signal that the pressure setting mode of the corresponding group of atmospheric relief valves is the overall setting mode to the pressure setting switching module of each atmospheric relief valve in the corresponding group.

[0013] When the operator clicks the individual setting mode on the switch button, the R terminal of the RS trigger connected to the switch button is set, and the RS trigger sends a signal that the pressure setting mode of the corresponding group of atmospheric relief valves is the individual setting mode to the pressure setting switching module of each atmospheric relief valve in the corresponding group.

[0014] In this invention, the pressure setting switching module is provided with IN1 pin, IN2 pin, OUT pin and SET pin. The SET pin receives the pressure setting mode selection signal of the corresponding group of atmospheric relief valves, the IN1 pin receives the individual setting value of the pressure of the corresponding atmospheric relief valve, and the IN2 pin receives the overall setting value of the pressure of the corresponding atmospheric relief valve.

[0015] When the pressure setting switching module receives a signal from the SET pin that the pressure setting mode of the corresponding group of atmospheric relief valves is the individual setting mode, it sends the individual setting value of the corresponding atmospheric relief valve pressure received from the IN1 pin to the PID of the corresponding atmospheric relief valve through the OUT pin.

[0016] When the pressure setting switching module receives a message from the SET pin indicating that the pressure setting mode of the corresponding atmospheric relief valve is the overall setting mode, it sends the overall pressure setting value of the corresponding atmospheric relief valve received from the IN2 pin to the PID of the corresponding atmospheric relief valve via the OUT pin.

[0017] In this invention, the PID is equipped with an SP pin; the pressure setting switching module sends the overall setting value or individual setting value of the corresponding atmospheric relief valve pressure received by the IN1 pin or IN2 pin to the SP pin of the PID of the corresponding atmospheric relief valve through the OUT pin.

[0018] In this invention, the overall setting station is also used to allow the operator to modify the overall setting value of the pressure of each atmospheric release valve in the corresponding group to the individual setting value before the pressure control mode of the corresponding group of atmospheric release valves is switched from the individual setting mode to the overall setting mode.

[0019] In this invention, the individual setpoint station is equipped with AM pin, PV pin and OUT pin; the automatic control system for the multi-module atmospheric release valve of the sodium-cooled fast reactor also includes a handheld device, with one handheld device corresponding to one group of atmospheric release valves;

[0020] The handheld device is used to manually select the individual setting station of each atmospheric release valve in the corresponding group as manual or automatic when the pressure setting mode of the corresponding group atmospheric release valve is the individual setting mode. It automatically generates the manual / automatic mode selection signal of the individual setting station of each atmospheric release valve in the corresponding group and sends it to the AM pin of the individual setting station of each atmospheric release valve in the corresponding group.

[0021] When the pressure setting mode of the corresponding atmospheric relief valve is set to individual setting mode, the AM pin value of the individual setting station follows the input value of the handheld controller, the PV pin value follows the field measurement value of the corresponding atmospheric relief valve pressure, and the OUT pin value follows the PV pin value.

[0022] In this invention, the automatic control system for multi-module atmospheric release valves of sodium-cooled fast reactor also includes an analog quantity switching module, with one group of atmospheric release valves corresponding to one analog quantity switching module;

[0023] The switching module is also used to send the pressure setting mode selection signal of the corresponding group of atmospheric relief valves to the analog quantity switching module of the corresponding group of atmospheric relief valves.

[0024] The analog quantity switching module is used to send the pressure setting mode selection signal of the corresponding group of atmospheric relief valves to the AM pin of the individual setting value station of each atmospheric relief valve in the corresponding group when the pressure setting mode of the corresponding group of atmospheric relief valves is the overall setting mode, obtain the overall setting value of the pressure of each atmospheric relief valve in the corresponding group and send it to the PV pin of the individual setting value station of each atmospheric relief valve in the corresponding group.

[0025] When the pressure setting mode of the corresponding atmospheric relief valve is in the overall setting mode, the AM pin value of the individual setting station is 0, the OUT pin value follows the PV pin value, and the PV pin value follows the overall setting value of the corresponding atmospheric relief valve pressure.

[0026] Beneficial technical effects of the present invention:

[0027] The automatic control system for multi-module atmospheric release valves in the sodium-cooled fast reactor of this invention has two pressure setting modes: individual setting mode and overall setting mode. When the turbine bypass system loses control, it switches to the overall setting mode to set the pressure of multiple atmospheric release valves as a whole, improving the working efficiency of atmospheric release valve pressure setting and enabling the atmospheric release valves to respond quickly, thereby effectively exerting the overpressure protection function of the atmospheric release valves for the steam generator. After the atmospheric release valve pressure stabilizes at the overall set pressure value, it switches back to the individual setting mode. The individual setting mode and the overall setting mode achieve seamless switching. This ensures a rapid response of the atmospheric release valve protection function in emergency situations, guaranteeing the automated, safe, and reliable control and operation of the sodium-cooled fast reactor. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of an embodiment of the automatic control system for the multi-module atmospheric release valve of the sodium-cooled fast reactor of the present invention. Detailed Implementation

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “equivalent to”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0030] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments.

[0032] refer to Figure 1 This embodiment provides an automatic control system for multi-module atmospheric release valves of a sodium-cooled fast reactor, including a switching module, a single-unit setpoint station, an overall setpoint station, a pressure setting switching module, and a PID controller. The atmospheric release valves are divided into one or more groups. One group of atmospheric release valves corresponds to one switching module and one overall setpoint station, and one atmospheric release valve corresponds to one single-unit setpoint station, one pressure setting switching module, and one PID controller.

[0033] The switching module is equipped with a switching button. When all atmospheric relief valves in the corresponding group are in automatic control mode, the pressure setting mode selection signal for each atmospheric relief valve in the corresponding group is generated and sent to the pressure setting switching module of each atmospheric relief valve in the corresponding group according to the operator's selection of the pressure setting mode for each atmospheric relief valve in the corresponding group, which is either the individual setting mode or the overall setting mode.

[0034] The overall setting station is used by the operator to set the pressure setting value of each atmospheric relief valve in the corresponding group as a whole, obtain the overall pressure setting value of each atmospheric relief valve in the corresponding group and send it to the pressure setting switching module of each atmospheric relief valve in the corresponding group.

[0035] The individual setting station is used by the operator to set the pressure setting value of the corresponding atmospheric relief valve, obtain the individual setting value of the corresponding atmospheric relief valve pressure, and send it to the pressure setting switching module of the corresponding atmospheric relief valve.

[0036] The pressure setting switching module is used to send the individual or overall pressure setting value of the corresponding atmospheric relief valve to the PID of the corresponding atmospheric relief valve according to the pressure setting mode selection signal of the corresponding group of atmospheric relief valves.

[0037] PID is used to control the opening degree of the corresponding atmospheric relief valve based on the difference between the overall set value or individual set value of the corresponding atmospheric relief valve pressure and the field measurement value.

[0038] In this embodiment, the switching module is provided with a switching button and an RS trigger connected to the output of the switching button. The switching button is provided with a single-unit setting mode and an overall setting mode.

[0039] When the operator clicks the overall setting mode on the switch button, the S terminal of the RS trigger connected to the switch button is set, and the RS trigger sends a signal that the pressure setting mode of the corresponding group of atmospheric relief valves is the overall setting mode to the pressure setting switching module of each atmospheric relief valve in the corresponding group.

[0040] When the operator clicks the individual setting mode on the switch button, the R terminal of the RS trigger connected to the switch button is set, and the RS trigger sends a signal that the pressure setting mode of the corresponding group of atmospheric relief valves is the individual setting mode to the pressure setting switching module of each atmospheric relief valve in the corresponding group.

[0041] In this embodiment, the pressure setting switching module is provided with IN1 pin, IN2 pin, OUT pin and SET pin. The SET pin receives the pressure setting mode selection signal of the corresponding group of atmospheric relief valves, the IN1 pin receives the individual setting value of the pressure of the corresponding atmospheric relief valve, and the IN2 pin receives the overall setting value of the pressure of the corresponding atmospheric relief valve.

[0042] When the pressure setting switching module receives a signal from the SET pin that the pressure setting mode of the corresponding group of atmospheric relief valves is the individual setting mode, it sends the individual setting value of the corresponding atmospheric relief valve pressure received from the IN1 pin to the PID of the corresponding atmospheric relief valve through the OUT pin.

[0043] When the pressure setting switching module receives a message from the SET pin indicating that the pressure setting mode of the corresponding atmospheric relief valve is the overall setting mode, it sends the overall pressure setting value of the corresponding atmospheric relief valve received from the IN2 pin to the PID of the corresponding atmospheric relief valve via the OUT pin.

[0044] In this embodiment, the PID is equipped with an SP pin; the pressure setting switching module sends the overall setting value or individual setting value of the corresponding atmospheric relief valve pressure received by the IN1 pin or IN2 pin to the SP pin of the PID corresponding to the atmospheric relief valve through the OUT pin.

[0045] In this embodiment, the overall setting station is also used to allow the operator to modify the overall setting value of the pressure of each atmospheric release valve in the corresponding group to the individual setting value before the pressure control mode of the corresponding group of atmospheric release valves is switched from the individual setting mode to the overall setting mode, so as to ensure that the pressure setting mode of the corresponding group of atmospheric release valves is switched smoothly from the individual setting mode to the overall setting mode.

[0046] In this embodiment, the individual setting station is equipped with an AM pin, a PV pin, and an OUT pin; when the AM pin value of the individual setting station is 0, it indicates that the individual setting station is in manual mode; when the AM pin value of the individual setting station is 1, it indicates that the individual setting station is in automatic mode.

[0047] The automatic control system for multi-module atmospheric release valves of sodium-cooled fast reactor also includes a handheld device, with one handheld device corresponding to one set of atmospheric release valves;

[0048] The handheld device is used to manually select the individual setting station of each atmospheric release valve in the corresponding group as manual or automatic when the pressure setting mode of the corresponding group atmospheric release valve is the individual setting mode. It automatically generates the manual / automatic mode selection signal of the individual setting station of each atmospheric release valve in the corresponding group and sends it to the AM pin of the individual setting station of each atmospheric release valve in the corresponding group.

[0049] When the pressure setting mode of the corresponding atmospheric relief valve is set to individual setting mode, the AM pin value of the individual setting station follows the input value of the handheld controller, the PV pin value follows the field measurement value of the corresponding atmospheric relief valve pressure, and the OUT pin value follows the PV pin value.

[0050] In this embodiment, the automatic control system for the multi-module atmospheric release valve of the sodium-cooled fast reactor also includes an analog quantity switching module, with one group of atmospheric release valves corresponding to one analog quantity switching module.

[0051] The switching module is also used to send the pressure setting mode selection signal of the corresponding group of atmospheric relief valves to the analog quantity switching module of the corresponding group of atmospheric relief valves.

[0052] The analog quantity switching module is used to send the pressure setting mode selection signal of the corresponding group of atmospheric relief valves to the AM pin of the individual setting value station of each atmospheric relief valve in the corresponding group when the pressure setting mode of the corresponding group of atmospheric relief valves is the overall setting mode, obtain the overall setting value of the pressure of each atmospheric relief valve in the corresponding group and send it to the PV pin of the individual setting value station of each atmospheric relief valve in the corresponding group.

[0053] When the pressure setting mode of the corresponding atmospheric relief valve is in the overall setting mode, the AM pin value of the individual setting station is 0, the OUT pin value follows the PV pin value, and the PV pin value follows the overall setting value of the corresponding atmospheric relief valve pressure, ensuring a seamless switching of the pressure control mode of the corresponding atmospheric relief valve from the overall setting mode to the individual setting mode.

[0054] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An automatic control system for a multi-module atmospheric release valve in a sodium-cooled fast reactor, characterized in that, It includes a switching module, a single-unit setpoint station, an overall setpoint station, a pressure setting switching module, and a PID controller; the atmospheric relief valve is divided into one or more groups, with one group of atmospheric relief valves corresponding to one switching module and one overall setpoint station, and one atmospheric relief valve corresponding to one single-unit setpoint station, one pressure setting switching module, and one PID controller. The switching module is equipped with a switching button. When the corresponding group of atmospheric relief valves is in automatic control mode, the pressure setting mode selection signal of the corresponding group of atmospheric relief valves is generated and sent to the pressure setting switching module of each atmospheric relief valve in the corresponding group according to the operator's selection of the pressure setting mode of the corresponding group of atmospheric relief valves, which is either individual setting mode or overall setting mode. The overall setting station is used by the operator to set the pressure setting value of each atmospheric relief valve in the corresponding group as a whole, obtain the overall pressure setting value of each atmospheric relief valve in the corresponding group and send it to the pressure setting switching module of each atmospheric relief valve in the corresponding group. The individual setting station is used by the operator to set the pressure setting value of the corresponding atmospheric relief valve, obtain the individual setting value of the corresponding atmospheric relief valve pressure, and send it to the pressure setting switching module of the corresponding atmospheric relief valve. The pressure setting switching module is used to send the individual or overall pressure setting value of the corresponding atmospheric relief valve to the PID of the corresponding atmospheric relief valve according to the pressure setting mode selection signal of the corresponding group of atmospheric relief valves. PID is used to control the opening degree of the corresponding atmospheric relief valve based on the difference between the overall set value or individual set value of the corresponding atmospheric relief valve pressure and the field measurement value.

2. The automatic control system for the multi-module atmospheric release valve of the sodium-cooled fast reactor according to claim 1, characterized in that, The switching module is equipped with a switching button and an RS trigger connected to the output of the switching button. The switching button has a single-unit setting mode and an overall setting mode. When the operator clicks the overall setting mode on the switch button, the S terminal of the RS trigger connected to the switch button is set, and the RS trigger sends a signal that the pressure setting mode of the corresponding group of atmospheric relief valves is the overall setting mode to the pressure setting switching module of each atmospheric relief valve in the corresponding group. When the operator clicks the individual setting mode on the switch button, the R terminal of the RS trigger connected to the switch button is set, and the RS trigger sends a signal that the pressure setting mode of the corresponding group of atmospheric relief valves is the individual setting mode to the pressure setting switching module of each atmospheric relief valve in the corresponding group.

3. The automatic control system for the multi-module atmospheric release valve of the sodium-cooled fast reactor according to claim 1, characterized in that, The pressure setting switching module has an IN1 pin, an IN2 pin, an OUT pin, and a SET pin. The SET pin receives the pressure setting mode selection signal for the corresponding group of atmospheric relief valves, the IN1 pin receives the individual setting value of the corresponding atmospheric relief valve pressure, and the IN2 pin receives the overall setting value of the corresponding atmospheric relief valve pressure. When the pressure setting switching module receives a signal from the SET pin that the pressure setting mode of the corresponding group of atmospheric relief valves is the individual setting mode, it sends the individual setting value of the corresponding atmospheric relief valve pressure received from the IN1 pin to the PID of the corresponding atmospheric relief valve through the OUT pin. When the pressure setting switching module receives a message from the SET pin indicating that the pressure setting mode of the corresponding atmospheric relief valve is the overall setting mode, it sends the overall pressure setting value of the corresponding atmospheric relief valve received from the IN2 pin to the PID of the corresponding atmospheric relief valve via the OUT pin.

4. The automatic control system for the multi-module atmospheric release valve of the sodium-cooled fast reactor according to claim 3, characterized in that, The PID has an SP pin; the pressure setting switching module sends the overall or individual pressure setting value of the corresponding atmospheric relief valve received by the IN1 or IN2 pin to the SP pin of the PID of the corresponding atmospheric relief valve through the OUT pin.

5. The automatic control system for the multi-module atmospheric release valve of the sodium-cooled fast reactor according to claim 1, characterized in that, It also includes a handheld controller, with one handheld controller corresponding to one set of atmospheric release valves; the individual setpoint station is equipped with AM pin, PV pin and OUT pin; The handheld device is used to manually select the individual setting station of each atmospheric release valve in the corresponding group as manual or automatic when the pressure setting mode of the corresponding group atmospheric release valve is the individual setting mode. It automatically generates the manual / automatic mode selection signal of the individual setting station of each atmospheric release valve in the corresponding group and sends it to the AM pin of the individual setting station of each atmospheric release valve in the corresponding group. When the pressure setting mode of the corresponding atmospheric relief valve is set to individual setting mode, the AM pin value of the individual setting station follows the input value of the handheld controller, the PV pin value follows the field measurement value of the corresponding atmospheric relief valve pressure, and the OUT pin value follows the PV pin value.

6. The automatic control system for the multi-module atmospheric release valve of the sodium-cooled fast reactor according to claim 5, characterized in that, The overall setting station is also used to allow the operator to modify the overall setting value of the pressure of each atmospheric relief valve in the corresponding group to the individual setting value before the pressure control mode of the corresponding group of atmospheric relief valves is switched from the individual setting mode to the overall setting mode.

7. The automatic control system for the multi-module atmospheric release valve of the sodium-cooled fast reactor according to claim 6, characterized in that, It also includes an analog quantity switching module, with one analog quantity switching module corresponding to one set of atmospheric release valves; The switching module is also used to send the pressure setting mode selection signal of the corresponding group of atmospheric relief valves to the analog quantity switching module of the corresponding group of atmospheric relief valves. The analog quantity switching module is used to send the pressure setting mode selection signal of the corresponding group of atmospheric relief valves to the AM pin of the individual setting value station of each atmospheric relief valve in the corresponding group when the pressure setting mode of the corresponding group of atmospheric relief valves is the overall setting mode, obtain the overall setting value of the pressure of each atmospheric relief valve in the corresponding group and send it to the PV pin of the individual setting value station of each atmospheric relief valve in the corresponding group. When the pressure setting mode of the corresponding atmospheric relief valve is in the overall setting mode, the AM pin value of the individual setting station is 0, the OUT pin value follows the PV pin value, and the PV pin value follows the overall setting value of the corresponding atmospheric relief valve pressure.

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