Unit retraction state indication method, system, device and computer readable storage medium

Abstract

The present application relates to a method, system and device for indicating the state of nuclear power unit after withdrawal, and a computer readable storage medium, wherein the method comprises the following steps: S10, collecting initial operation condition information of the nuclear power unit, collecting current state information of the nuclear steam supply system, and determining whether the condition for withdrawal is met according to the initial operation condition information of the nuclear power unit and the current state information of the nuclear steam supply system; S20, when the condition for withdrawal is met, collecting current operation condition information of the nuclear power unit, performing logical diagnosis in combination with the current state information of the nuclear steam supply system, and obtaining a diagnosis result; and S30, outputting state indication information according to the diagnosis result. The method can output indication information of the state that should be reached to ensure the safety of the nuclear power unit after withdrawal when a fault condition or a disaster accident occurs, so that the operator can quickly obtain the withdrawal path of the nuclear power unit according to the indication information, thereby shortening the time for the operator to process the accident information of the nuclear power plant.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant fault conditions or disaster response, and more particularly to methods, systems, devices and computer-readable storage media for guiding unit withdrawal status. Background Technology

[0002] When a nuclear power plant experiences a malfunction or disaster, once it is confirmed that the malfunction or disaster has actually occurred and cannot be repaired in a timely manner, the operator needs to decide on the unit's retreat status based on the current unit status and the extent to which the equipment is affected, in order to ensure the safe state of the reactor.

[0003] In related technologies, operators use manual judgment to determine the retreat state of the unit; however, this method relies on the operator's manual operation and judgment, which may not yield the optimal retreat state. At the same time, during fault conditions or disasters, a large number of unit / equipment unusable information or alarm signals are generated, resulting in a heavy workload for the operator and a significant risk of human error. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method, system, device and computer-readable storage medium for guiding the withdrawal status of a generator unit.

[0005] The technical solution adopted by this invention to solve its technical problem is: to construct a method for guiding the withdrawal status of a generator unit, comprising the following steps:

[0006] Step S10: Collect the initial operating condition information of the unit and the current status information of the nuclear steam supply system, and determine whether the withdrawal requirement conditions are met based on the initial operating condition information of the unit and the current status information of the nuclear steam supply system.

[0007] Step S20: When the withdrawal requirement condition is met, collect the current operating condition information of the unit, and perform logical diagnosis in combination with the current status information of the nuclear steam supply system to obtain the diagnosis result;

[0008] Step S30: Output status guidance information based on the diagnostic results.

[0009] Preferably, step S20 includes:

[0010] Step S21: Set the highest-level retreat state as the current retreat state;

[0011] Step S22: Determine the retreat function corresponding to the current retreat state, and determine whether the retreat function is available based on the current operating condition information of the unit. If not, proceed to step S27; if yes, proceed to step S23.

[0012] Step S23: Determine the risk item corresponding to the current retreat state, and determine whether the risk item exists based on the current operating condition information of the unit. If yes, proceed to step S27; otherwise, proceed to step S24.

[0013] Step S24: Determine whether the current retreat state is the lowest level retreat state. If yes, proceed to step S25; otherwise, proceed to step S26.

[0014] Step S25: Obtain the diagnostic result that takes the current retreat state as the final retreat state;

[0015] Step S26: Take the next retreat state of the current retreat state as the current retreat state, and execute step S22;

[0016] Step S27: Determine whether the current retreat state is the highest level retreat state. If yes, proceed to step S28; otherwise, proceed to step S29.

[0017] Step S28: Obtain the diagnostic result that the highest-level retreat state is unavailable;

[0018] Step S29: Obtain the diagnostic result that takes the previous retreat state of the current retreat state as the final retreat state.

[0019] Preferably, in step S30, outputting the status guidance information includes:

[0020] The system outputs instructions to either retreat the unit to the final retreat state or to maintain the current state.

[0021] Preferably, step S30 further includes:

[0022] Output the result of whether the backoff function is available and the result of whether the risk item exists.

[0023] Preferably, in step S22, determining the retreat function corresponding to the current retreat state includes:

[0024] Based on the current retreat state, determine the preset retreat function that corresponds to the current retreat state.

[0025] Preferably, the step of obtaining the retraction function includes:

[0026] Step S221: Determine the current status of the unit and the relocation status of the unit when it is about to be relocated;

[0027] Step S222: Based on the current state, obtain the current state conditions of the unit;

[0028] Step S223: Based on the upcoming retreat state, obtain the first state condition of the unit;

[0029] Step S224: Compare the correspondence between the first state condition and the current state condition to obtain the rollback function required to change from the current state condition to the first state condition.

[0030] Preferably, step S23 includes:

[0031] Step S231: Based on the current retreat state, and in conjunction with a preset second mapping table, obtain the corresponding risk item; the second mapping table contains the mapping relationship between the retreat state and the risk item;

[0032] Step S232: Based on the obtained risk items, determine the isolation function used to eliminate the risk items;

[0033] Step S233: Based on the current status information of the nuclear steam supply system, determine whether the isolation function is available; if yes, determine that there is no risk item and execute step S24; if no, determine that there is a risk item and execute step S27.

[0034] Preferably, step S10 includes:

[0035] S11: Collect the initial operating condition information of the unit;

[0036] S12: Based on the collected initial operating condition information and combined with a preset first mapping table, the state requirements of the nuclear steam supply system are obtained; the first mapping table contains the mapping relationship between the initial operating condition information and the state requirements of the nuclear steam supply system.

[0037] S13: Collect the current status information of the nuclear steam supply system and determine whether the current status information of the nuclear steam supply system meets the status requirements;

[0038] If not, then the conditions for retreat are met.

[0039] If so, then the conditions for retreat are not met.

[0040] Preferably, before step S10, the method further includes:

[0041] Step S09: Receive an intervention signal containing the requirements of the operating procedures for fault conditions or disaster accidents, and execute step S10.

[0042] The present invention also constructs a unit withdrawal status guidance system, comprising:

[0043] The data acquisition and judgment module is used to collect the initial operating condition information of the unit and the current status information of the nuclear steam supply system, and to determine whether the conditions for withdrawal are met based on the initial operating condition information of the unit and the current status information of the nuclear steam supply system.

[0044] The data acquisition and diagnostic module is used to collect the current operating status information of the unit when the withdrawal requirement is met; and to perform logical diagnosis in combination with the current status information of the nuclear steam supply system to obtain the diagnostic results.

[0045] The display module is used to output status guidance information based on the diagnostic results.

[0046] The present invention also constructs a unit withdrawal status guidance device, including a processor and a memory storing a computer program, wherein the processor implements the steps of the above-described unit withdrawal status guidance method when executing the computer program.

[0047] The present invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the above-described unit withdrawal status guidance method.

[0048] Implementing this invention has the following beneficial effects: When a fault occurs or a disaster occurs, the unit withdrawal status guidance method of this invention outputs guidance information on the withdrawal status that should be achieved to ensure unit safety. Operators can quickly obtain the withdrawal target based on this guidance information, making it easier to select the optimal withdrawal path. This unit withdrawal status guidance method can reduce the interference and workload of operators in manually analyzing large amounts of unusable information and alarms during fault conditions or disasters, shortening the time operators spend processing nuclear power plant accident information. It allows operators to focus more on the system configuration for controlling unit safety, contributing to further improving the intelligence level and unit safety level of nuclear power plants. Attached Figure Description

[0049] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0050] Figure 1 This is a flowchart of the unit withdrawal status guidance method of the present invention in some embodiments;

[0051] Figure 2 This is a flowchart of the unit withdrawal status guidance method of the present invention in some other embodiments;

[0052] Figure 3 This is a flowchart of the procedure for determining whether the retraction function is available based on the collected current operating condition information of the unit in the unit retraction status guidance method of the present invention.

[0053] Figure 4 This is a flowchart of the procedure in the unit withdrawal status guidance method of the present invention, which determines whether there are risk items based on the collected current operating condition information of the unit. Detailed Implementation

[0054] To provide a clearer understanding of the technical features, objectives, and effects of this invention, specific embodiments are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or element referred to must have a specific orientation; therefore, they should not be construed as limitations on this invention.

[0055] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0056] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0057] This invention constructs a method for guiding the retreat status of nuclear power plants. This method is applicable to nuclear power plants and, in the event of a fault or disaster, outputs guidance information on the retreat status that must be achieved to ensure unit safety. Operators can quickly obtain the retreat target based on this guidance information, facilitating the selection of the optimal retreat path. This method reduces the interference and workload of operators in manually analyzing large amounts of unusable information and alarms during faults or disasters, shortens the time operators spend processing nuclear power plant accident information, and allows operators to focus more on the system configuration for controlling unit safety. This contributes to further improving the intelligence level and unit safety level of nuclear power plants.

[0058] In some embodiments, such as Figure 1 As shown, the method for guiding the unit's withdrawal status includes the following steps:

[0059] Step S10: Collect the initial operating condition information of the unit and the current status information of the nuclear steam supply system, and determine whether the conditions for withdrawal are met based on the initial operating condition information of the unit and the current status information of the nuclear steam supply system.

[0060] Step S20: When the withdrawal requirement is met, collect the current operating status information of the unit, combine it with the current status information of the nuclear steam supply system to perform logical diagnosis, and obtain the diagnosis result;

[0061] Step S30: Output status guidance information based on the diagnostic results.

[0062] Understandably, the initial operating condition of a unit refers to the operating condition during normal operation of the unit. The operating conditions of the unit include power operation condition, hot standby condition, hot shutdown condition, steam generator cooling two-phase intermediate shutdown condition, residual heat removal system cooling intermediate shutdown condition, normal cold shutdown condition, maintenance cold shutdown condition, and refueling shutdown condition.

[0063] The initial operating condition information of the unit represents the operating condition information of the unit during normal operation. The operating condition information includes various state conditions such as reactor power, reactivity, primary loop average temperature and pressure.

[0064] The nuclear steam supply system is a collective term for a series of systems used in a nuclear power plant for power generation, propulsion, and heating. Based on availability, each system in the nuclear steam supply system can be classified as either usable or unusable; based on operational status, it can be classified as either operational or shut down.

[0065] In the event of a malfunction or disaster (such as a fire) at a nuclear power plant, a portion of the nuclear steam supply system may be lost. The nuclear power unit should be withdrawn to a state where the safety risks of losing the nuclear steam supply system are minimized. However, if the malfunction or disaster is not severe or can be resolved (e.g., in a non-critical fire compartment or if the fire can be extinguished), and there is no need for withdrawal due to the malfunction or disaster, then the unit withdrawal guidance system is not required.

[0066] Based on this, the operating condition information of the unit during normal operation can determine the required state of each system in the nuclear steam supply system. When a fault condition or disaster occurs, it is determined whether the current state information of the nuclear steam supply system meets the required state. If it does, the unit can be maintained in its current state; otherwise, a retreat requirement arises, and the unit needs to be controlled to retreat to the corresponding retreat state.

[0067] When a relocation requirement arises, considering that some units may have failed due to malfunctions or disasters, it is necessary to diagnose and determine whether relocation to the appropriate relocation state is possible. Furthermore, if relocation to the optimal relocation state is not possible, logical diagnostics should be used to find the relatively most suitable relocation state to minimize damage to the units.

[0068] In this invention, multiple retreat states can be pre-set based on past fault conditions or disasters of nuclear power units, so as to find the optimal retreat state when the unit needs to retreat.

[0069] In some embodiments, X retreat states are preset, where X is a positive integer; these can be divided into the highest-level retreat state, the lowest-level retreat state, and one or more retreat states arranged between the highest-level and lowest-level retreat states. Each retreat state is consistent with the nature of the unit's initial operating condition information, and the retreat state includes various state conditions such as reactor power, reactivity, primary loop average temperature, and pressure. In some embodiments, the X retreat states are arranged in descending order of physical parameters, such as temperature parameters and pressure parameters; the higher the physical parameter, the closer it is to the highest-level retreat state; conversely, the lower the physical parameter, the closer it is to the lowest-level retreat state. See also... Figure 2 The retreat state N represents the state at which the retreat state is in

[0070] One of X retreat states, where N is a positive integer and 1 ≤ N ≤ X.

[0071] After determining the final retreat state, the system can output status guidance information that the operator can execute. Upon receiving this guidance, the operator can quickly control the unit to retreat to the relatively optimal retreat state. Of course, if the fault condition or disaster is too severe, the unit cannot enter the retreat state. In this case, the guidance information instructs the operator to maintain the current state while waiting for other personnel to repair the fault condition or resolve the disaster.

[0072] In some embodiments, see Figure 2 Step S10 includes the following steps:

[0073] Step S11: Collect initial operating condition information of the unit;

[0074] Step S12: Based on the collected initial operating condition information and combined with the preset first mapping table, obtain the state requirements of the nuclear steam supply system; the first mapping table contains the mapping relationship between the initial operating condition information and the state requirements of the nuclear steam supply system.

[0075] Step S13: Collect the current status information of the nuclear steam supply system and determine whether the current status information of the nuclear steam supply system meets the status requirements;

[0076] If not, then the conditions for retreat are met.

[0077] If so, then the conditions for retreat are not met.

[0078] Understandably, the first mapping table can be pre-made according to the nuclear power plant operation specifications, and it contains the mapping relationship between the unit's operating conditions and the state of the nuclear steam supply system. When operating condition information (reactor power, reactivity, primary loop average temperature and pressure, etc.) is collected, the specific operating condition of the unit can be determined; combined with the first mapping table, the system state requirements that the nuclear steam supply system should be in can be derived.

[0079] The system status of a nuclear steam supply system can be categorized into two states: usable and unusable, or operating and shut down. Based on the system status requirements, it can be determined which systems within the nuclear steam supply system must be in an usable state for the unit. In the event of a fault or disaster, by collecting the current status information of the nuclear steam supply system, it can be determined which systems are currently usable and which are not. By comparing the current status information with the system status requirements, it can be determined whether the current status of the nuclear steam supply system meets the initial operating conditions required by the unit.

[0080] In some embodiments, prior to step S10, the following steps are included:

[0081] Step S09: Receive intervention action signals containing the requirements of the operating procedures for fault conditions or disaster accidents.

[0082] Understandably, when a nuclear power plant experiences a malfunction or disaster, after the operator confirms that the malfunction or disaster has actually occurred and executes the intervention actions required by the fire accident operation procedure, the unit withdrawal status guidance system of the present invention intervenes to determine whether a withdrawal requirement has been generated.

[0083] In some embodiments, see Figure 2 Step S20 may include the following steps:

[0084] Step S21: Set the highest-level retreat state as the current retreat state;

[0085] Step S22: Determine the back-off function corresponding to the current back-off state, and determine whether the back-off function is available based on the current operating status information of the unit. If not, proceed to step S27; if yes, proceed to step S23.

[0086] Step S23: Determine the risk item corresponding to the current retreat state, and judge whether there is a risk item based on the current operating condition information of the unit. If yes, proceed to step S27; otherwise, proceed to step S24.

[0087] Step S24: Determine whether the current retreat state is the lowest level retreat state. If yes, proceed to step S25; otherwise, proceed to step S26.

[0088] Step S25: Obtain the diagnostic result that takes the current retreat state as the final retreat state;

[0089] Step S26: Take the next retreat state of the current retreat state as the current retreat state, and execute step S22;

[0090] Step S27: Determine whether the current retreat state is the highest level retreat state. If yes, proceed to step S28; otherwise, proceed to step S29.

[0091] Step S28: Obtain the diagnostic result that the highest level of retreat state is unavailable;

[0092] Step S29: Obtain the diagnostic result that takes the previous retreat state of the current retreat state as the final retreat state.

[0093] Understandably, in step S21, during the logical judgment, the ability of the unit to retreat is determined level by level until the final retreat state is reached. In this embodiment, the unit retreats from the current operating state, starting from the highest-level retreat state. That is, it must retreat from the current operating state to the highest-level retreat state before it can retreat to the next retreat state adjacent to the highest-level retreat state, and so on, until it retreats to the lowest-level retreat state.

[0094] The fallback function refers to the requirement that when controlling a unit to fall back from its current operating state to the highest fallback state, or to fall back from one fallback state to the next adjacent fallback state, it requires the functional support of one or more specific units. However, these units may temporarily stop operating due to fault conditions, making it impossible to control the unit to enter the corresponding fallback state. Therefore, it is necessary to diagnose whether the fallback function corresponding to the fallback state is available.

[0095] For example, when a nuclear power plant transitions from withdrawal state one (power operation condition) to withdrawal state two (hot shutdown condition), one of the conditions is that the boron concentration of the primary coolant changes from the critical boron concentration to the hot shutdown boron concentration. Therefore, the transition from withdrawal state one (power operation condition) to withdrawal state two (hot shutdown condition) requires the availability of withdrawal function one (primary coolant boronizing function). This primary coolant boronizing function can include the maximum flow boronizing and emergency boronizing functions within the nuclear steam supply system. Therefore, if either maximum flow boronizing or emergency boronizing is available, withdrawal function one can be used from withdrawal state one to withdrawal state two; otherwise, withdrawal function one is unavailable. If all withdrawal functions required for the change in conditions from withdrawal state one to withdrawal state two are available, then the transition from withdrawal state one to withdrawal state two can proceed.

[0096] In step S22, determining the retreat function corresponding to the current retreat state includes: determining a preset retreat function that corresponds to the current retreat state based on the current retreat state.

[0097] This invention provides pre-set retreat functions corresponding to each retreat state. These functions are available during diagnostic processes where the unit is preparing to retreat from its current operating state to the highest-level retreat state, or during diagnostic processes where it is retreating from one retreat state to the next adjacent retreat state. Each retreat state may have one or more retreat functions.

[0098] In some embodiments, see Figure 3 As shown, the steps to obtain the rollback function include:

[0099] Step S221: Determine the current status of the unit and the relocation status of the unit when it is about to be relocated;

[0100] Step S222: Obtain the current state conditions of the unit based on the current state;

[0101] Step S223: Based on the upcoming retreat state, obtain the first state condition of the unit;

[0102] Step S224: Compare the correspondence between the first state condition and the current state condition to obtain the backoff function required to change from the current state condition to the first state condition.

[0103] Understandably, the current state of the unit can be either the current operating state or one of X retreat states. For the unit to retreat from its current operating state to the highest-level retreat state, or from one retreat state to the next adjacent retreat state, the unit's operating condition information (reactor power, reactivity, primary loop average temperature and pressure, etc.) needs to meet certain conditions; therefore, the unit needs functional support capable of changing these conditional parameters.

[0104] In determining whether the fallback function is available, some embodiments rely on fault condition reports (the monitoring system of a nuclear power plant lists equipment affected by fault conditions as failed equipment and generates fault condition reports) to determine whether the equipment has failed. If it has failed, the fallback function can be deemed unavailable. In some embodiments, a status diagnostic device provided with the equipment can be used to provide feedback on whether its own functions are available.

[0105] In step S23, a risk item refers to: when the control unit retreats from its current operating state to the highest retreat state, or from a retreat state to the next retreat state adjacent to the previous retreat state, the retreat results in unnecessary protective system actions or the introduction of unexpected transients. This risk item arises during retreat and may jeopardize the safety of the unit; it may include one or more.

[0106] For example, in the event of a fire in a safety building of a nuclear power plant, the fire will inevitably destroy the power supply or trigger an intervention operation (power cut-off), causing the electrically operated isolation valve of the safety injection tank to lose its power source. This prevents the operator from closing the valve. The safety injection tank is filled with nitrogen gas at approximately 4.7 MPa above the boric acid solution. The tank is connected to the reactor coolant system, and a check valve is installed on the connecting pipeline. During normal operation, the electrically operated isolation valve of the safety injection tank remains open, and the reactor coolant system pressure is 15.5 MPa. Because the reactor coolant system pressure is higher than the safety injection tank pressure, the safety injection tank cannot inject into the reactor coolant system. If the pressure drops below the injection pressure of the safety injection tank during the retraction process, it may cause injection into the tank, resulting in fluctuations in the primary coolant circuit pressure and level. Since the electrically operated isolation valve cannot close, nitrogen gas from the safety injection tank may even be injected into the primary coolant circuit, leading to a deterioration in the thermal conductivity between the primary and secondary circuits and endangering the safety of the unit.

[0107] In some embodiments, see Figure 4 As shown, step S23 includes the following steps:

[0108] Step S231: Based on the current retreat state, and in conjunction with the preset second mapping table, obtain the corresponding risk item; the second mapping table contains the mapping relationship between the retreat state and the risk item;

[0109] Step S232: Based on the obtained risk items, determine the isolation functions used to eliminate the risk items;

[0110] Step S233: Based on the current status information of the nuclear steam supply system, determine whether the isolation function is available; if yes, determine that there is no risk item and proceed to step S24; if no, determine that there is a risk item and proceed to step S27.

[0111] Understandably, a second mapping table can be pre-established based on the nuclear power plant's operational history data and / or unit design. This table, designed to meet withdrawal requirements, includes the correspondence between each withdrawal state and risk item. Each withdrawal state may correspond to one or more risk items. To address the risk items arising from withdrawal to a withdrawal state, isolation equipment is needed to provide functional support for eliminating the corresponding risk items. The availability of isolation functionality can be determined by referring to the above method for assessing withdrawal functionality, and will not be elaborated upon here.

[0112] Therefore, when a unit moves from its current operating state to the highest level of retreat, or moves from one retreat state to the next adjacent retreat state, it is necessary to ensure that all necessary retreat functions are available and that all risk items are absent.

[0113] In addition, steps S24 to S29 are judgment steps set to find the most suitable retreat state. Under the premise that all retreat functions are available and no risk items exist, the unit is controlled to approach or enter the lowest level of retreat state as much as possible to ensure that the harm to the safety of the unit is minimized.

[0114] For example, if a fire occurs in a safety building of a nuclear power plant during the initial power operation of the unit, and the on-site operators cut off all power to this safety building, multiple nuclear steam supply system functions will become unusable, including the primary coolant pumps, normal spraying, and the charging, high-pressure venting, and low-pressure venting functions of the chemical and volume control systems. The unavailability of the low-pressure function will also disable the depressurization function for retreating to a normal cold shutdown condition. Therefore, the retreat can only proceed to the state preceding the normal cold shutdown condition, namely, the intermediate shutdown condition with residual heat removal system cooling. Although the retreat function to the intermediate shutdown condition with residual heat removal system cooling is usable, the risk of the safety injection tank not being able to isolate it remains. Therefore, the retreat can only proceed to the state preceding the intermediate shutdown condition with residual heat removal system cooling, namely, the intermediate shutdown condition with steam generator cooling (primary loop pressure greater than 6.9 MPa.g).

[0115] In some embodiments, in step S30, the output status guidance information includes: outputting guidance information requiring the unit to retreat to the final retreat state, or outputting guidance information requiring the unit to maintain the current state.

[0116] Understandably, if the diagnostic unit is unable to enter at least the highest level of retreat state after the final retreat state is determined through step S20, it means that the unit cannot retreat to any retreat state. In this case, the operator can only be instructed to maintain the status quo.

[0117] In some embodiments, in addition to outputting guidance information, step S30 may also output information such as unit status, unit operating conditions, the result of whether the backoff function is available, and the result of whether there are risk items.

[0118] The present invention also constructs a unit withdrawal status guidance system, which can output guidance information on the withdrawal status that should be achieved to ensure the safety of the unit in the event of a fault or disaster.

[0119] The guidance system includes:

[0120] The data acquisition and judgment module is used to collect initial operating condition information of the unit and current status information of the nuclear steam supply system, and to determine whether the conditions for withdrawal are met based on the initial operating condition information of the unit and the current status information of the nuclear steam supply system.

[0121] The data acquisition and diagnostic module is used to collect the current operating status information of the unit when the withdrawal requirement is met; and to perform logical diagnosis by combining the current status information of the nuclear steam supply system to obtain the diagnostic results.

[0122] The display module is used to output status guidance information based on the diagnostic results.

[0123] In some embodiments, the data acquisition and diagnostic module includes:

[0124] The first judgment unit is used to receive the judgment result of whether the retreat requirement condition is met; and after receiving the judgment result of whether the retreat requirement condition is met, it takes the highest retreat state as the current retreat state and determines the retreat function corresponding to the current retreat state.

[0125] The first judgment unit is also used to receive the current operating condition information of the unit and determine whether the backoff function is available based on the current operating condition information of the unit. When the backoff function is available, it sends the judgment result that the backoff function is available to the second judgment unit. When the backoff function is unavailable, it sends the judgment result that the backoff function is unavailable to the third judgment unit.

[0126] The first judgment unit is also used to, based on the received signal that the next retreat state of the current retreat state is taken as the current retreat state, take the next retreat state of the current retreat state as the current retreat state, and determine again whether the retreat function corresponding to the current retreat state is available.

[0127] The second judgment unit is used to receive the judgment result that the backoff function is available and determine the risk item corresponding to the current backoff state. The second judgment unit is also used to receive the current operating condition information of the unit and judge whether there is a risk item based on the current operating condition information of the unit; if there is a risk item, it sends the judgment result of the existence of the risk item to the third judgment unit; if there is no risk item, it sends the judgment result of the non-existence of the risk item to the fourth judgment unit.

[0128] The third judgment unit is used to receive the judgment result and, based on the judgment result, determine whether the current retreat state is the highest level retreat state. If the current retreat state is the highest level retreat state, it sends a determination message containing the determination that the highest level retreat state is unavailable to the display module. If the current retreat state is not the highest level retreat state, it sends a determination message containing the determination that the previous retreat state of the current retreat state is the final retreat state to the display module.

[0129] The fourth judgment unit is used to receive the judgment result and, based on the judgment result, determine whether the current retreat state is the lowest level retreat state; when the current retreat state is the lowest level retreat state, it sends confirmation information containing the determination that the current retreat state is the final retreat state to the display module; when the current retreat state is not the lowest level retreat state, it sends a signal containing the determination that the next retreat state of the current retreat state is the current retreat state to the first judgment unit.

[0130] In some embodiments, the first determining unit includes:

[0131] The first acquisition unit is used to acquire the first state condition of the unit in the current retreat state based on the current retreat state; and to acquire the current state condition of the unit in the current operation based on the collected current operating condition information of the unit.

[0132] The first comparison unit is used to compare the first state condition with the current state condition, determine the correspondence between them, and obtain the retreat function corresponding to the current retreat state.

[0133] The first judgment unit is used to determine whether the backoff function is available based on the collected current operating status information of the unit; if the backoff function is unavailable, it sends a judgment result containing the backoff function being unavailable to the third judgment unit; if the backoff function is available, it sends a judgment result containing the backoff function being available to the second judgment unit.

[0134] In some embodiments, the second determining unit includes:

[0135] The second acquisition unit is used to obtain the corresponding risk item based on the current retreat status and a preset second mapping table.

[0136] The first determination unit is used to determine the isolation function for eliminating the risk item based on the obtained risk item.

[0137] The second judgment unit is used to determine whether the isolation function is available based on the current status information of the nuclear steam supply system; when the isolation function is available, it sends the judgment result containing the absence of risk items to the fourth judgment unit; when the isolation function is unavailable, it sends the judgment result containing the presence of risk items to the third judgment unit.

[0138] In some embodiments, the data acquisition and judgment module includes:

[0139] The data acquisition unit is used to collect initial operating condition information of the unit; and based on the collected initial operating condition information and a preset first mapping table, to obtain the system state requirements that the nuclear steam supply system should be in.

[0140] The data acquisition and judgment unit is used to acquire the current status information of the nuclear steam supply system and determine whether the current status information of the nuclear steam supply system meets the system status requirements; and send the judgment result to the data acquisition and diagnosis module to determine whether the backoff requirement conditions are met.

[0141] In some embodiments, the unit withdrawal status guidance system further includes a receiving module. This receiving module receives intervention action signals containing requirements of operating procedures for fault conditions or disasters, and sends them to the data acquisition and judgment module. The intervention action signal can serve as a start command, instructing the data acquisition and judgment module to perform its actions.

[0142] In some embodiments, the guidance screen includes guidance information requiring the crew to retreat to the final retreat state or requiring the crew to maintain the current state. In some embodiments, the guidance screen also includes information on whether the retreat function is available and / or whether there are any risk items.

[0143] The present invention also constructs a method for guiding the withdrawal status of a generator unit, including a processor and a memory storing a computer program, wherein the processor implements the steps of the above-mentioned method for guiding the withdrawal status of a generator unit when executing the computer program.

[0144] The present invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the above-described unit withdrawal status guidance method.

[0145] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A method for guiding the withdrawal status of a generating unit, characterized in that, Includes the following steps: step S10: Collect initial operating condition information of the unit and current status information of the nuclear steam supply system, and determine whether the withdrawal requirement conditions are met based on the initial operating condition information of the unit and the current status information of the nuclear steam supply system. Step S20: When the withdrawal requirement condition is met, collect the current operating condition information of the unit, and perform logical diagnosis in combination with the current status information of the nuclear steam supply system to obtain the diagnosis result; Step S30: Output status guidance information based on the diagnostic results; Step S10 includes: Step S11: Collect the initial operating condition information of the unit; Step S12: Based on the collected initial operating condition information and combined with a preset first mapping table, obtain the state requirements of the nuclear steam supply system; the first mapping table contains the mapping relationship between the initial operating condition information and the state requirements of the nuclear steam supply system. Step S13: Collect the current status information of the nuclear steam supply system and determine whether the current status information of the nuclear steam supply system meets the status requirements; If not, then the conditions for retreat are met. If so, then the conditions for retreat are not met; Step S20 includes: Step S21: Set the highest-level retreat state as the current retreat state; Step S22: Determine the retreat function corresponding to the current retreat state, and determine whether the retreat function is available based on the current operating condition information of the unit. If not, proceed to step S27; if yes, proceed to step S23. Step S23: Determine the risk item corresponding to the current retreat state, and determine whether the risk item exists based on the current operating condition information of the unit. If yes, proceed to step S27; if no, proceed to step S24. The risk item is an unnecessary protection system action or an unexpected transient introduced due to the retreat. Step S24: Determine whether the current retreat state is the lowest level retreat state. If yes, proceed to step S25; otherwise, proceed to step S26. Step S25: Obtain the diagnostic result that takes the current retreat state as the final retreat state; Step S26: Take the next retreat state of the current retreat state as the current retreat state, and execute step S22; Step S27: Determine whether the current retreat state is the highest level retreat state. If yes, proceed to step S28; otherwise, proceed to step S29. Step S28: Obtain the diagnostic result that the highest-level retreat state is unavailable; Step S29: Obtain the diagnostic result that takes the previous retreat state as the final retreat state; Steps S24 to S29 are judgment steps set to find the most suitable retreat state, so as to control the unit to approach or enter the lowest level of retreat state as much as possible under the premise that the retreat function is available and there are no risk items, so as to minimize the harm to the safety of the unit.

2. The method for guiding the withdrawal status of a generating unit according to claim 1, characterized in that, In step S30, outputting the status guidance information includes: The system outputs instructions to either retreat the unit to the final retreat state or to maintain the current state.

3. The method for guiding the unit's withdrawal status according to claim 1 or 2, characterized in that, Step S30 further includes: Output the result of whether the backoff function is available and the result of whether the risk item exists.

4. The method for guiding the unit's withdrawal status according to claim 1, characterized in that, In step S22, determining the retreat function corresponding to the current retreat state includes: Based on the current retreat state, determine the preset retreat function that corresponds to the current retreat state.

5. The method for guiding the unit's withdrawal status according to claim 4, characterized in that, The steps for obtaining the retraction function include: Step S221: Determine the current status of the unit and the relocation status of the unit when it is about to be relocated; Step S222: Based on the current state, obtain the current state conditions of the unit; Step S223: Based on the upcoming retreat state, obtain the first state condition of the unit; Step S224: Compare the correspondence between the first state condition and the current state condition to obtain the rollback function required to change from the current state condition to the first state condition.

6. The method for guiding the unit's withdrawal status according to claim 1, characterized in that, Step S23 includes: Step S231: Based on the current retreat state, and in conjunction with a preset second mapping table, obtain the corresponding risk item; the second mapping table contains the mapping relationship between the retreat state and the risk item; Step S232: Based on the obtained risk items, determine the isolation function used to eliminate the risk items; Step S233: Based on the current status information of the nuclear steam supply system, determine whether the isolation function is available; if yes, determine that there is no risk item and execute step S24; if no, determine that there is a risk item and execute step S27.

7. The method for guiding the withdrawal status of a generating unit according to claim 1, characterized in that, Before step S10, the method further includes: Step S09: Receive an intervention signal containing the requirements of the operating procedures for fault conditions or disaster accidents, and execute step S10.

8. A unit withdrawal status guidance system, characterized in that, include: The data acquisition and judgment module is used to collect the initial operating condition information of the unit and the current status information of the nuclear steam supply system, and to determine whether the conditions for withdrawal are met based on the initial operating condition information of the unit and the current status information of the nuclear steam supply system. The data acquisition and diagnostic module is used to collect the current operating status information of the unit when the withdrawal requirement is met; and to perform logical diagnosis in combination with the current status information of the nuclear steam supply system to obtain the diagnostic results. The display module is used to output status guidance information based on the diagnostic results; The acquisition and judgment module includes an acquisition unit, which is used to acquire the initial operating condition information of the unit and, based on the acquired initial operating condition information and a preset first mapping table, obtain the system state requirements that the nuclear steam supply system should be in. The data acquisition and diagnostic module includes: The first judgment unit is used to receive the judgment result of whether the withdrawal requirement conditions are met; and after receiving the judgment result of meeting the withdrawal requirement conditions, it takes the highest-level withdrawal state as the current withdrawal state and determines the withdrawal function corresponding to the current withdrawal state; the first judgment unit is also used to receive the current operating condition information of the unit, and judge whether the withdrawal function is available based on the current operating condition information of the unit, and send the judgment result of the withdrawal function being available to the second judgment unit when the withdrawal function is available, and send the judgment result of the withdrawal function being unavailable to the third judgment unit when the withdrawal function is unavailable; the first judgment unit is also used to take the next withdrawal state of the current withdrawal state as the current withdrawal state based on the received signal that the next withdrawal state of the current withdrawal state is taken as the current withdrawal state, and judge again whether the withdrawal function corresponding to the current withdrawal state is available. The second judgment unit is used to receive the judgment result that the backoff function is available and determine the risk item corresponding to the current backoff state; the second judgment unit is also used to receive the current operating condition information of the unit and judge whether there is a risk item based on the current operating condition information of the unit; when there is a risk item, it sends the judgment result of the existence of the risk item to the third judgment unit, and when there is no risk item, it sends the judgment result of the non-existence of the risk item to the fourth judgment unit; the risk item is the unnecessary protection system action or the introduction of unexpected transients due to backoff; The third judgment unit is used to receive the judgment result and, based on the judgment result, determine whether the current retreat state is the highest level retreat state; when the current retreat state is the highest level retreat state, it sends a determination message containing the highest level retreat state is unavailable to the display module; when the current retreat state is not the highest level retreat state, it sends a determination message containing the determination that the previous retreat state of the current retreat state is the final retreat state to the display module. The fourth judgment unit is used to receive the judgment result and, based on the judgment result, determine whether the current retreat state is the lowest level retreat state; when the current retreat state is the lowest level retreat state, it sends confirmation information containing the determination that the current retreat state is the final retreat state to the display module; when the current retreat state is not the lowest level retreat state, it sends a signal containing the determination that the next retreat state of the current retreat state is the current retreat state to the first judgment unit. The acquisition and diagnosis module is configured to control the unit to approach or enter the lowest level of retreat state as much as possible, provided that all retreat functions are available and no risk items exist, so as to minimize the harm to the unit's safety.

9. A unit withdrawal status guidance device, characterized in that, It includes a processor and a memory storing a computer program, wherein the processor, when executing the computer program, implements the steps of the unit withdrawal status guidance method according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the unit withdrawal status guidance method according to any one of claims 1-7.

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