CN113488213A - Method and device for preventing severe transient change of pressurized water reactor downstream operation RRA - Google Patents
Method and device for preventing severe transient change of pressurized water reactor downstream operation RRA Download PDFInfo
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- G21C15/18—Emergency cooling arrangements; Removing shut-down heat
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Abstract
The application is applicable to the technical field of a primary loop auxiliary system of a nuclear power station, and provides a method and a device for preventing serious transient change of a Pressurized Water Reactor (PWR) downstream operation RRA, wherein the method comprises the following steps: when the liquid level of the voltage stabilizer is less than or equal to the setting value, the RRA is adjusted to be connected with a control valve of a lower leakage loop so as to adjust the lower leakage flow to a first preset flow value, and the adjusting time point is recorded; determining a difference between the current time and the current adjustment time point; if the difference is greater than or equal to the preset time length, the RRA is adjusted to be connected with the control valve of the bleed-down loop so as to adjust the bleed-down flow to a second preset flow value, and the second preset flow value is greater than the first preset flow value. This application connects the circuit control valve that lets down through dividing twice adjustment RRA to adjust the flow that lets down earlier to first preset flow value, after the interval presets for a long time, readjust to second preset flow value, so that fill the temperature small amplitude decline at every turn, avoid serious transient, thereby prolong the life-span of pipeline equipment and strengthen its availability.
Description
Technical Field
The application belongs to the technical field of a primary loop auxiliary system of a nuclear power station, and particularly relates to a method and a device for preventing severe transient when a pressurized water reactor is put into operation in a downstream RRA mode.
Background
At present, nuclear power is widely applied as an energy technology for solving energy requirements, and particularly, energy is provided by a nuclear power unit. The nuclear power unit is a basic power generation unit consisting of a reactor, a steam turbine generator unit matched with the reactor, and systems and facilities required for maintaining normal operation and ensuring safety of the reactor and the steam turbine generator unit.
When the unit operates the RRA (Residual Heat Removal system) downwards, because the pressure Control valve of the lower discharging loop is in an RCV (Chemical and Volume Control) mode, the downstream pressure of the lower discharging hole plate is kept unchanged, and the pressure of the loop is kept unchanged in the RRA process, so that the lower discharging flow passing through the regenerative Heat exchanger is kept unchanged. In this case, the RRA pump is started to heat the RRA, the bleed-down flow is adjusted to ensure the purification of the primary circuit and control the heating rate of the RRA, which causes the temperature of the charging pipe to drop rapidly, thereby generating transient and affecting the service life and availability of the pipe equipment.
Disclosure of Invention
The embodiment of the application provides a method, a device, terminal equipment, a computer readable storage medium and a computer program product for preventing severe temperature transient when a pressurized water reactor is put into operation in a downstream RRA mode, and the problem that severe transient occurs when the pressurized water reactor is put into operation in the downstream RRA mode can be solved.
In a first aspect, embodiments of the present application provide a method for preventing severe transients in a pressurized water reactor downstream operational RRA, comprising:
when the liquid level of the voltage stabilizer is less than or equal to the setting value, the RRA is adjusted to be connected with a control valve of a lower leakage loop so as to adjust the lower leakage flow to a first preset flow value, and the adjusting time point is recorded;
determining a difference between a current time and the current adjustment time point;
if the difference is greater than or equal to the preset time length, the RRA is adjusted to be connected with a control valve of a lower discharge loop so as to adjust the lower discharge to a second preset flow value, and the second preset flow value is greater than the first preset flow value.
Further, when the liquid level of the pressure stabilizer is greater than the setting value, the method further comprises:
receiving a user instruction;
and responding to the user instruction, and setting the value of the setting value as the liquid level of the voltage stabilizer.
Further, the preset time is determined by the time when the liquid level is reduced to the adjusted setting value and the time when the temperature of the charging pipeline is reduced to a preset temperature interval.
Further, the first preset flow value is 15m3/h。
Further, the second preset flow value is 28.5m3/h。
Furthermore, the corresponding reduction amplitude value of the temperature of the charging pipeline reduced to the preset temperature interval is [47C-67C ] or [67C-87C ].
In a second aspect, embodiments of the present application provide an apparatus for preventing severe transients in a RRA during a downburst operation of a pressurized water reactor, comprising:
the timing unit is used for recording an adjusting time point and determining a difference value between the current time and the current adjusting time point;
the execution unit is used for connecting the control valve of the lower leakage loop by adjusting the RRA when the liquid level of the voltage stabilizer is less than or equal to a setting value so as to adjust the lower leakage flow to a first preset flow value;
and if the difference is greater than or equal to the preset time length, adjusting the discharge flow to a second preset flow value by adjusting the RRA to be connected with a discharge loop control valve, wherein the second preset flow value is greater than the first preset flow value.
Further, the execution unit is further configured to receive a user instruction when the liquid level of the voltage stabilizer is greater than the setting value;
and responding to the user instruction, and setting the value of the setting value as the liquid level of the voltage stabilizer.
Further, the preset time is determined by the time when the liquid level is reduced to the adjusted setting value and the time when the temperature of the charging pipeline is reduced to a preset temperature interval.
Further, the first preset flow value is 15m3/h。
Further, the second preset flow value is 28.5m3/h。
Furthermore, the corresponding reduction amplitude value of the temperature of the charging pipeline reduced to the preset temperature interval is [47C-67C ] or [67C-87C ].
In a third aspect, an embodiment of the present application provides a terminal device, including: memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor performs the method of any of the above first aspects when executing the computer program.
In a fourth aspect, the present application provides a computer-readable storage medium, including a computer program stored thereon, where the computer program is executed by a processor to perform the method of any one of the above first aspects.
In a fifth aspect, the present application provides a computer program product, which when run on a terminal device, causes the terminal device to execute the method of any one of the above first aspects.
It is understood that the beneficial effects of the second aspect to the fifth aspect can be referred to the related description of the first aspect, and are not described herein again.
Compared with the prior art, the embodiment of the application has the advantages that:
the embodiment of the application connects the control valve of the discharging loop by adjusting the RRA twice, so that the discharging flow is adjusted to a first preset flow value firstly, and then adjusted to a second preset flow value after the preset time interval, so that the charging temperature is reduced in a small range every time, severe transient is avoided, the service life of the pipeline equipment is prolonged, and the availability of the pipeline equipment is enhanced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for preventing severe transients during a downdraft RRA operation of a pressurized water reactor according to an embodiment of the present application;
FIG. 2 is a schematic flow chart of a method for preventing severe transients during a downwind RRA operation of a pressurized water reactor according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a device for preventing severe temperature transients during downstream RRA according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to" determining "or" in response to detecting ". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
Furthermore, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used for distinguishing between descriptions and not necessarily for describing or implying relative importance.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
During the operation of RRA (Residual Heat Removal system) in the downflow phase of a pressurized water reactor, the overcharge temperature drop of RCV (Chemical and Volume Control system) is too large, i.e. severe transients occur, which affect the life and availability of the piping equipment.
Specifically, the reason for generating transient is found through tracking investigation to be that during the RRA process of downstream operation of the unit, when the RRA is boosted completely, the RCV013VP (pressure control valve of the lower discharge loop) needs to be adjusted to enable the lower discharge flow to be 5m3Then, RCV013VP is set to RCV mode (auto mode) and RCV310VP is closed (RRA connected bleed circuit control valve). At this time, the amount of the bleed-down flow passing through RCV001EX (bleed-down heat exchanger) was 5m3H and because RCV013VP is in RCV mode, the pressure downstream of the downcomer is maintained at the corresponding set point, and the pressure in the circuit is not changed during this process, so that the differential pressure across the downcomer of the RCV is maintained during this process, resulting in the downcomer flow through RCV001EX (downcomer heat exchanger) being maintained at 5m at all times3The/h is unchanged.
And then, opening an RRA inlet isolation valve, adjusting the RCV310VP before starting the RRA pump to heat the RRA, and increasing the downward discharge flow so as to ensure that the purification and heating rate of the primary circuit meet the requirements. In this case, however, the amount of bleed-down flow increases, but the amount of bleed-down flow passing through RCV001EX is always 5m3The pressure difference between the upstream and the downstream of the RCV046VP is constant, so that the upper charge flow greatly rises along with the increase of the lower discharge flow due to the liquid level of an automatic control voltage stabilizer of the RCV046VP (upper charge flow regulating valve) and simultaneously flows through the RCVThe 001EX let-down flow rate is also substantially constant, which causes the upper charge temperature, which is obtained by RCV019MT (upper charge pipe temperature measurement module), to drop rapidly and by an excessive amount.
Then, the severe transient is judged to be a transient 32.2 by a transient judging method.
Specifically, the change rate of the charging temperature and the change amplitude of the charging temperature are used for judging, the rate judges whether transient exists or not, and the amplitude judges the severity of the transient. And judging by using a judgment threshold window delta TRCV/t > 20 ℃/h, and judging that the transient exists when the time threshold (1h) is exceeded by the threshold window. And determining the corresponding transient type according to the amplitude. The severe transient Δ TRCV is within the temperature range [107 ℃ < Δ TRCV < 228 ℃ ] corresponding to the transient 32.2, and is therefore judged to be a transient 32.2.
Based on this, the present embodiment provides a method for preventing severe transients from occurring during a downward RRA of a pressurized water reactor, thereby preventing severe transients from occurring, thereby extending the life and enhancing the availability of pipeline equipment.
Fig. 1 is a schematic flow chart of a method for preventing severe transients in a downward operational RRA of a pressurized water reactor according to an embodiment of the present application. As shown in fig. 1, the method of the present embodiment includes:
s101: when the liquid level of the voltage stabilizer is smaller than or equal to the setting value, the RRA is adjusted to be connected with the control valve of the lower leakage loop so as to adjust the lower leakage flow to a first preset flow value, and the adjusting time point is recorded.
The pressure regulator level is observed prior to the first adjustment of the RRA to connect the bleed circuit control valve, i.e., prior to the first adjustment of RCV310 VP. The RCV310VP is adjusted when the liquid level of the pressure stabilizer is less than or equal to the setting value, and the let-down flow is adjusted to a first preset flow value. This allows the temperature of the upper charge to be reduced to a predetermined temperature range, thereby achieving a small amplitude reduction, which avoids severe transients, i.e. 32.2 transients.
In the adjustment, when the charging temperature is decreased to a certain temperature range and is stably within the temperature range, the temperature range can be set as a preset temperature range.
Optionally, the first preset flow value is 15m3/h。
Optionally, the corresponding decrease amplitude value of the temperature of the charging pipe decreased to the preset temperature range is [47 ℃ -67 ℃ ] or [67 ℃ -87 ].
For example, the amplitude of the drop of the current adjustment may be 48 ℃, 66 ℃ or 80 ℃ due to actual production conditions.
S102: a difference between the current time and the current adjustment time point is determined.
The second adjustment can be carried out only after the charging temperature of the first adjustment is reduced and stabilized in a preset temperature range, the waiting time length can be determined according to the reduction time of the charging temperature, namely the preset time length, and the second adjustment can be carried out in time by setting the preset time length.
And after the first adjustment, acquiring the current time in real time, and determining the difference value between the current time and the current adjustment time point to provide a basis for performing the second adjustment in time.
S103: if the difference is greater than or equal to the preset time length, the RRA is adjusted to be connected with the control valve of the bleed-down loop so as to adjust the bleed-down flow to a second preset flow value, and the second preset flow value is greater than the first preset flow value.
After the interval is preset for a preset time, the RCV310VP is adjusted for the second time, and the bleed-down flow rate is adjusted to a second preset flow rate value, so that the charging temperature is decreased to a second temperature interval, which is smaller than the preset temperature interval, thereby realizing a small-amplitude decrease and avoiding severe transient, i.e. avoiding the transient 32.2.
Optionally, the second preset flow value is 28.5m3/h。
In the adjustment, when the charging temperature is decreased to a certain temperature range and is stably within the temperature range, the temperature range may be set as a second temperature range.
The corresponding reduction amplitude value of the temperature of the upper charging pipeline reduced to the second temperature range is [47 ℃ -67 ℃ ] or [67 ℃ -87 ℃ ]
In the embodiment, the RRA is adjusted twice at intervals of preset time to be connected with the control valve of the bleed-down loop, so that the bleed-down flow is adjusted to a first preset flow value firstly, and then adjusted to a second preset flow value after the intervals of the preset time, the charging temperature is reduced in a small range every time, severe transient is avoided, the service life of pipeline equipment is prolonged, and the availability of the pipeline equipment is enhanced.
Fig. 2 is a schematic flow chart of a method for preventing severe transients during a downward operational RRA of a pressurized water reactor according to an embodiment of the present application. Before the RRA is put into operation, only one lower discharge orifice plate is reserved in the pressure reduction process of the primary circuit, so that the lower discharge flow is gradually reduced along with the pressure reduction of the primary circuit, and the upper charge flow is automatically reduced to the minimum flow along with the lower discharge flow. Then the liquid level of the voltage stabilizer is still gradually increased, and the downward discharge quantity is adjusted to be 5m3After/h, due to the limitation of the RRA heating rate, the lower leakage flow cannot be increased immediately, and meanwhile, the upper charging shaft seal flow is larger than the lower leakage flow, so that the liquid level of the pressure stabilizer can be larger than a setting value.
If the liquid level of the voltage stabilizer is greater than the setting value, the RRA is put into operation to adjust the RCV310VP to increase the lower leakage flow, the upper charging flow cannot be increased during the period of increasing the lower leakage flow, the upper charging flow still enables the minimum flow, and when the liquid level of the voltage stabilizer is reduced to the setting value, the upper charging flow is increased, so that the upper charging temperature is greatly reduced, and severe transient is caused. In this regard, a method of preventing severe transients in a pressurized water reactor downstream RRA is provided. As shown in fig. 2, when the liquid level of the potentiostat is greater than the set value, the method further comprises:
s201: receiving a user instruction;
s202: and responding to a user instruction, and setting the value of the setting value as the liquid level of the voltage stabilizer.
The numerical value of the setting value is set as the liquid level of the current voltage stabilizer, so that after the liquid level of the stabilizer is smaller than or equal to the adjusted setting value, the RRA is adjusted twice to be connected with the control valve of the lower discharge loop, the lower discharge flow is adjusted to a first preset flow value, after the RRA is adjusted to a second preset flow value after a preset time interval, the charging temperature cannot be greatly reduced, and severe transient is avoided.
Correspondingly, the preset time length is determined by the time when the liquid level is reduced to the adjusted setting value and the time when the temperature of the upper charging pipeline is reduced to the preset temperature interval.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
Corresponding to the method described in the foregoing embodiment, fig. 3 is a schematic structural diagram of a device for preventing temperature severe transient when RRA is operated downstream according to the embodiment of the present application, and for convenience of illustration, only the portion related to the embodiment of the present application is shown.
As shown in fig. 3, the apparatus 30 for preventing temperature severe transient when RRA is put into operation downstream according to this embodiment includes:
a timing unit 31 for recording an adjustment time point and determining a difference between the current time and the current adjustment time point;
the execution unit 32 is used for connecting the control valve of the lower leakage loop by adjusting the RRA when the liquid level of the voltage stabilizer is less than or equal to a setting value so as to adjust the lower leakage flow to a first preset flow value;
and if the difference is greater than or equal to the preset time length, the RRA is adjusted to be connected with the control valve of the bleed-down loop so as to adjust the bleed-down flow to a second preset flow value, and the second preset flow value is greater than the first preset flow value.
Optionally, the first preset flow value is 15m3/h。
Optionally, the second preset flow value is 28.5m3/h。
In this embodiment, the timing unit determines the difference between the current time and the current adjustment time point to enable the execution unit to adjust the RRA twice to connect the control valve of the bleed-down loop, so as to adjust the bleed-down flow to the first preset flow value, and then adjust the bleed-down flow to the second preset flow value after a preset time interval, so as to decrease the charging temperature at each time by a small amplitude, that is, decrease the charging temperature to the preset temperature range first and then decrease the charging temperature to the second temperature range, thereby avoiding severe transient, and further prolonging the service life of the pipeline equipment and enhancing the availability thereof.
In another embodiment, the execution unit is further configured to receive a user instruction when the liquid level of the pressure stabilizer is greater than a setting value;
and responding to the user instruction, and setting the value of the setting value as the liquid level of the voltage stabilizer.
Correspondingly, the preset time length is determined by the time when the liquid level is reduced to the adjusted setting value and the time when the temperature of the upper charging pipeline is reduced to the preset temperature interval.
The corresponding reduction amplitude value of the temperature of the upper charging pipeline reduced to the preset temperature range is [47 ℃ -67 ℃ ] or [67 ℃ -87 ].
The corresponding reduction amplitude value of the temperature of the upper charging pipeline reduced to the second temperature interval is [47 ℃ -67 ℃ ] or [67 ℃ -87 ].
Wherein the second temperature interval is smaller than the preset temperature interval.
Fig. 4 is a schematic structural diagram of a terminal device according to an embodiment of the present application. As shown in fig. 4, the terminal device 4 of this embodiment includes: at least one processor 40 (only one shown in fig. 4), a memory 41, and a computer program 42 stored in the memory 41 and executable on the at least one processor 40, the processor 40 implementing the steps in any of the various method embodiments described above when executing the computer program 42.
The terminal device may include, but is not limited to, a processor 40, a memory 41. Those skilled in the art will appreciate that fig. 4 is merely an example of the terminal device 4, and does not constitute a limitation of the terminal device 4, and may include more or less components than those shown, or combine some components, or different components, such as an input-output device, a network access device, and the like.
The Processor 40 may be a Central Processing Unit (CPU), and the Processor 40 may be other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 41 may in some embodiments be an internal storage unit of the terminal device 4, such as a hard disk or a memory of the terminal device 4. In other embodiments, the memory 41 may also be an external storage device of the terminal device 4, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), or the like provided on the terminal device 4. Further, the memory 41 may also include both an internal storage unit and an external storage device of the terminal device 4. The memory 41 is used for storing an operating system, an application program, a BootLoader (BootLoader), data, and other programs, such as program codes of the computer program. The memory 41 may also be used to temporarily store data that has been output or is to be output.
It should be noted that, for the information interaction, execution process, and other contents between the above-mentioned devices/units, the specific functions and technical effects thereof are based on the same concept as those of the embodiment of the method of the present application, and specific reference may be made to the part of the embodiment of the method, which is not described herein again.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
An embodiment of the present application further provides a network device, where the network device includes: at least one processor, a memory, and a computer program stored in the memory and executable on the at least one processor, the processor implementing the steps of any of the various method embodiments described above when executing the computer program.
The embodiments of the present application further provide a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements the steps in the above-mentioned method embodiments.
The embodiments of the present application provide a computer program product, which when running on a mobile terminal, enables the mobile terminal to implement the steps in the above method embodiments when executed.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the processes in the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium and can implement the steps of the embodiments of the methods described above when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include at least: any entity or device capable of carrying computer program code to a photographing apparatus/terminal apparatus, a recording medium, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), an electrical carrier signal, a telecommunications signal, and a software distribution medium. Such as a usb-disk, a removable hard disk, a magnetic or optical disk, etc. In certain jurisdictions, computer-readable media may not be an electrical carrier signal or a telecommunications signal in accordance with legislative and patent practice.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (14)
1. A method of preventing severe transients in a pressurized water reactor during downstream RRA operations, comprising:
when the liquid level of the voltage stabilizer is less than or equal to the setting value, the RRA is adjusted to be connected with a control valve of a lower leakage loop so as to adjust the lower leakage flow to a first preset flow value, and the adjusting time point is recorded;
determining a difference between a current time and the current adjustment time point;
if the difference is greater than or equal to the preset time length, the RRA is adjusted to be connected with a control valve of a lower discharge loop so as to adjust the lower discharge to a second preset flow value, and the second preset flow value is greater than the first preset flow value.
2. The method of claim 1, wherein when the level of the potentiostat is greater than the set value, the method further comprises:
receiving a user instruction;
and responding to the user instruction, and setting the value of the setting value as the liquid level of the voltage stabilizer.
3. The method of claim 2, wherein the predetermined period of time is determined by the time the liquid level drops to the adjusted setting and the time the upper fill line temperature drops to a predetermined temperature interval.
4. Method according to claim 1 or 2, characterised in that said first preset flow value is 15m3/h。
5. Method according to claim 1 or 2, characterised in that said second preset flow value is 28.5m3/h。
6. The method as claimed in claim 3, wherein the decrease of the upper charging pipe temperature to the preset temperature interval corresponds to a decrease amplitude of [47 ℃ -67 ℃ ] or [67 ℃ -87 ℃.
7. An apparatus for preventing severe transients in the RRA of a pressurized water reactor during downstream operation, comprising:
the timing unit is used for recording an adjusting time point and determining a difference value between the current time and the current adjusting time point;
the execution unit is used for connecting the control valve of the lower leakage loop by adjusting the RRA when the liquid level of the voltage stabilizer is less than or equal to a setting value so as to adjust the lower leakage flow to a first preset flow value;
and if the difference is greater than or equal to the preset time length, adjusting the discharge flow to a second preset flow value by adjusting the RRA to be connected with a discharge loop control valve, wherein the second preset flow value is greater than the first preset flow value.
8. The apparatus of claim 7, wherein:
the execution unit is further used for receiving a user instruction when the liquid level of the voltage stabilizer is greater than the setting value;
and responding to the user instruction, and setting the value of the setting value as the liquid level of the voltage stabilizer.
9. The apparatus of claim 7, wherein: the preset time is determined by the time when the liquid level is reduced to the adjusted setting value and the time when the temperature of the upper charging pipeline is reduced to a preset temperature interval.
10. The apparatus of any of claims 7-9, wherein: the first preset flow value is 15m3/h。
11. The apparatus of any of claims 7-9, wherein: the second stepSetting the flow rate at 28.5m3/h。
12. The apparatus of claim 9, wherein: the corresponding reduction amplitude value of the temperature of the upper charging pipeline reduced to the preset temperature interval is [47 ℃ -67 ℃ ] or [67 ℃ -87 ].
13. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the method according to any of claims 1 to 6 when executing the computer program.
14. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 6.
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