Method for measuring reactivity of reactor core by using periodic method

Abstract

The invention provides a method for measuring reactivity of a reactor core by using a periodic method, which comprises the following steps: when the reactor core is at different moments, acquiring out-of-reactor nuclear measurement parameters and thermal parameters at corresponding moments; judging whether the ex-core nuclear measurement system is in a credible period or not, if the ex-core nuclear measurement system is in the credible period, obtaining a first target reactor period based on different moments and the corresponding ex-core nuclear measurement parameters, and calculating to obtain reactor core reactivity by adopting a periodic method based on the first target reactor period; and if the ex-reactor nuclear measurement system is in an untrusted period and the reactor core is in a steady state or a quasi-static state, obtaining a second target reactor period based on different moments and the corresponding thermal parameters, and calculating to obtain the reactivity of the reactor core by adopting a periodic method based on the second target reactor period. According to the method, the reactor period and the reactivity can be accurately and rapidly calculated when the reactor period and the reactivity period cannot be timely and accurately provided by an ex-core nuclear measurement system and a reactivity meter.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power plants and research reactors, and in particular to a method for measuring core reactivity using a periodic method. Background Art

[0002] Reactor reactivity refers to the relative size of the deviation of the effective multiplication factor of the reactor from the criticality. The reactor cycle refers to the time required for the average neutron density in the reactor to change by e times. The reactor doubling period refers to the time required for the average neutron density in the reactor to change by 2 times. Reactor reactivity can be calculated based on the reactor cycle.

[0003] During the reactor startup and operation, reactivity and cycle are important monitoring parameters, and their values ​​or change rates directly affect the safety of the reactor. At present, the reactor cycle is mainly measured and calculated by the external nuclear measurement system, and the reactor reactivity is mainly measured and calculated by connecting the external nuclear measurement signal to the reactivity instrument during the core startup phase.

[0004] The external nuclear measurement system of a pressurized water reactor generally includes a source range, an intermediate range, and a power range close to the pressure vessel. The start-up process of a pressurized water reactor generally uses the source range and the intermediate range to monitor the core status. The internal measurement signal can be converted into a pulse signal or a current signal, and then the cycle or doubling cycle calculation is performed. However, the maximum value of the doubling cycle measurement of the nuclear measurement system is 1000s. After exceeding 1000s, the maximum value of 1000s is still displayed, and the reactor doubling cycle cannot be truly fed back. At the same time, the calculation time interval is limited by the system and cannot be selected arbitrarily, and a false short cycle will appear during the lifting of the control rod.

[0005] Pool-type research reactors generally include source ranges and power ranges near the heavy water tank, and also use measurement signals to convert into pulse signals or current signals, and then perform period calculations. However, when light water slowly enters the heavy water tank, the number of neutrons measured by the out-of-core nuclear measurement decreases because the light water has a larger moderation and absorption cross section than heavy water. As a result, the out-of-core nuclear measurement system cannot truly represent the true value of the reactor, and the calculated core power and period are distorted.

[0006] The reactivity instrument is mainly used during the initial criticality and zero-power physical test of the reactor startup. Its principle is to connect an external nuclear measurement signal to the instrument and use the inverse dynamic equation to solve the reactivity. It is mainly used during the reactor startup and cannot monitor the reactor parameters throughout the process. Summary of the invention

[0007] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0008] To this end, the first object of the present invention is to propose a method for measuring core reactivity using the periodic method, so as to accurately and quickly calculate the reactor cycle and reactivity when the off-core nuclear measurement system and reactivity instrument are unable to provide the reactor cycle and reactivity in a timely and accurate manner.

[0009] A second object of the present invention is to provide a system for measuring core reactivity using a periodic method.

[0010] A third objective of the present invention is to provide an electronic device.

[0011] A fourth object of the present invention is to provide a computer-readable storage medium.

[0012] To achieve the above object, the first aspect of the present invention provides a method for measuring core reactivity using a periodic method, comprising:

[0013] When the core is at different times, obtain the corresponding out-of-core nuclear measurement parameters and thermal parameters;

[0014] Determine whether the ex-core nuclear measurement system is in a credible period. If the ex-core nuclear measurement system is in a credible period, obtain a first target reactor cycle based on different times and corresponding ex-core nuclear measurement parameters, and calculate the core reactivity based on the first target reactor cycle using a period method;

[0015] If the off-core nuclear measurement system is in an untrustworthy period and the core is in a steady state or quasi-static state, a second target reactor cycle is obtained based on different times and corresponding thermal parameters, and the core reactivity is calculated using a periodic method based on the second target reactor cycle.

[0016] In the method of the first aspect of the present invention, the ex-core nuclear measurement parameters include source range count rate, intermediate range current value, and power range power value.

[0017] In the method of the first aspect of the present invention, the thermal parameters include core thermal power, the difference between outlet temperature and zero-power temperature, and the difference between average temperature and zero-power temperature.

[0018] In the method of the first aspect of the present invention, the first target reactor cycle is obtained based on different moments and corresponding extra-core nuclear measurement parameters, including: calculating the ratio of the first extra-core nuclear measurement parameter at the first moment to the second extra-core nuclear measurement parameter at the second moment; calculating the time difference between the second moment and the first moment; and calculating the first target reactor cycle based on the time difference and the ratio of the extra-core nuclear measurement parameters.

[0019] In the method of the first aspect of the present invention, the second target reactor cycle is obtained based on different moments and corresponding thermal parameters, including: calculating the thermal parameter ratio of a first thermal parameter at a first moment to a second thermal parameter at a second moment; calculating the time difference between the second moment and the first moment; and calculating the second target reactor cycle based on the time difference and the thermal parameter ratio.

[0020] In the method of the first aspect of the present invention, the periodic method adopted is to select the inverse time equation.

[0021] In the method of the first aspect of the invention, the periodic method employed is to select the periodic-reactivity table.

[0022] To achieve the above object, the second aspect of the present invention provides a system for measuring core reactivity using a periodic method, comprising:

[0023] An acquisition module is used to acquire the out-of-core nuclear measurement parameters and thermal parameters at the corresponding time when the core is at different times;

[0024] A first calculation module is used for obtaining a first target reactor cycle based on different time points and corresponding external nuclear measurement parameters if the external nuclear measurement system is in a credible period, and obtaining the core reactivity by calculating the first target reactor cycle using a period method;

[0025] The second calculation module is used to determine whether the extra-core nuclear measurement system is in a trustworthy period. If the extra-core nuclear measurement system is in an untrustworthy period and the core is in a steady state or quasi-static state, a second target reactor cycle is obtained based on different times and corresponding thermal parameters. Based on the second target reactor cycle, the core reactivity is calculated using the periodic method.

[0026] To achieve the above-mentioned purpose, the third aspect of the present invention proposes an electronic device, comprising: a processor, and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the method proposed in the first aspect of the present invention.

[0027] To achieve the above-mentioned purpose, the fourth aspect of the present invention proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the method proposed in the first aspect of the present invention.

[0028] The method, system, electronic device and storage medium for measuring core reactivity using the periodic method provided by the present invention obtain the off-core nuclear measurement parameters and thermal parameters at corresponding moments when the core is at different moments; judge whether the off-core nuclear measurement system is in a trusted period, if the off-core nuclear measurement system is in a trusted period, obtain a first target reactor period based on different moments and corresponding off-core nuclear measurement parameters, and calculate the core reactivity based on the first target reactor period using the periodic method; if the off-core nuclear measurement system is in an untrustworthy period and the core is in a steady state or quasi-static state, obtain a second target reactor period based on different moments and corresponding thermal parameters, and calculate the core reactivity based on the second target reactor period using the periodic method. In this case, when the ex-core nuclear measurement system is in a credible period, the first target reactor cycle can be obtained by using different time and corresponding ex-core nuclear measurement parameters, and then the core reactivity is calculated by combining the period method. When the ex-core nuclear measurement system is in an untrustworthy period and the core is in a steady state or quasi-static state, the ex-core nuclear measurement system and the reactivity instrument cannot provide the reactor cycle in a timely and accurate manner. The second target reactor cycle is obtained based on different time and corresponding thermal parameters, and then the core reactivity is calculated by combining the period method. In this way, the reactor cycle and reactivity can be accurately and quickly calculated when the ex-core nuclear measurement system and the reactivity instrument cannot provide the reactor cycle and reactivity in a timely and accurate manner.

[0029] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0031] Figure 1 A layout diagram of a pressurized water reactor off-reactor nuclear testing system provided by an embodiment of the present invention;

[0032] Figure 2 A layout diagram of an off-reactor nuclear testing system for a swimming pool-type research reactor provided by an embodiment of the present invention;

[0033] Figure 3 A schematic flow chart of a method for measuring core reactivity using a periodic method provided by an embodiment of the present invention;

[0034] Figure 4 A schematic diagram of a specific flow chart of a method for measuring core reactivity using a periodic method provided in an embodiment of the present invention;

[0035] Figure 5 A reactor parameter curve diagram provided by an embodiment of the present invention;

[0036] Figure 6A reactor calculation cycle curve diagram provided by an embodiment of the present invention;

[0037] Figure 7 A block diagram of a system for measuring core reactivity using a periodic method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0039] The following describes a method and system for measuring core reactivity using a periodic method according to an embodiment of the present invention with reference to the accompanying drawings.

[0040] The embodiment of the present invention provides a method for measuring core reactivity using the periodic method, so as to accurately and quickly calculate the reactor period and reactivity when the off-core nuclear measurement system and the reactivity instrument are unable to provide the reactor period and reactivity in a timely and accurate manner.

[0041] Before describing the method of the present invention in detail, an understanding of reactor cycles and reactivity is first given.

[0042] Specifically, reactor reactivity refers to the relative size of the deviation of the reactor's effective proliferation factor from the critical value, which is generally represented by ρ, that is:

[0043]

[0044] Where k is the effective core growth coefficient.

[0045] The reactor cycle refers to the time required for the average neutron density in the reactor to change by e times at time t, usually represented by T, that is:

[0046]

[0047] In the formula, P0 is the neutron density at time t0, e is a natural constant, and T is the reactor period. P is the neutron density after the change. After taking the derivatives of both sides, we can simplify it to:

[0048] T=(tn-tn-1) / Ln(Pn / Pn-1)(4)

[0049] Where P n t n The neutron density at time, P n-1 t n-1 The neutron density at time.

[0050] The reactor doubling period refers to the time required for the average neutron density in the reactor to double at time t, usually expressed as T d express:

[0051] T d =T×ln2(5)

[0052] The reactor reactivity can be solved according to the inverse time equation, which satisfies equation (6):

[0053]

[0054] In the formula, l represents the neutron generation time, β i represents the fraction of delayed neutrons in the i-th group, λ i represents the delayed neutron decay constant of the i-th group.

[0055] At present, the reactor cycle mainly relies on the measurement and calculation of the extra-core nuclear measurement system, and the reactor reactivity is mainly measured and calculated by connecting the extra-core nuclear measurement signal to the reactivity instrument during the core startup phase.

[0056] Figure 1 This is a layout diagram of the pressurized water reactor extra-core nuclear testing system provided in an embodiment of the present invention. Figure 2 This is a layout diagram of the nuclear testing system outside the pool-type research reactor provided by an embodiment of the present invention. Figure 1 and Figure 2 The schematic diagrams of the layout of the existing pressurized water reactor extra-mole nuclear measurement system and the swimming pool-type research reactor extra-mole nuclear measurement system are shown.

[0057] like Figure 1 As shown in the figure, the existing PWR external nuclear measurement system generally includes the source range PC, the intermediate range CIC, and the power range UIC close to the pressure vessel. The PWR startup process generally uses the source range and the intermediate range to monitor the core state. The internal measurement signal can be converted into a pulse signal or a current signal, and the period or multiplication period calculation is performed using equations (4) and (5). Figure 2 As shown, the existing pool-type research reactor external nuclear measurement system generally includes a source range (i.e., a start-up range) and a power range close to the heavy water tank. The pool-type research reactor external nuclear measurement system also converts the measurement signal into a pulse signal or a current signal, and uses equations (4) and (5) to perform period calculation.

[0058] In some cases, the extra-pile nuclear measurement system of a pressurized water reactor cannot truly feedback the reactor doubling cycle. At the same time, its calculation time interval is limited by the system and cannot be selected arbitrarily, and false short cycles will appear during the lifting of the control rods. When light water slowly enters the heavy water tank of the extra-pile nuclear measurement system of a swimming pool-type research reactor, the number of neutrons measured by the extra-pile nuclear measurement decreases because the moderation and absorption cross-section of light water are larger than those of heavy water, resulting in the inability of the extra-pile nuclear measurement system to truly represent the true value of the reactor, and the calculated core power and cycle are distorted. The reactivity meter is mainly used during the startup of the reactor and cannot monitor the reactor parameters throughout the entire process. Therefore, the extra-pile nuclear measurement system of a pressurized water reactor, the extra-pile nuclear measurement system of a swimming pool-type research reactor, and the reactivity meter are unable to provide reactor cycles and reactivity in a timely and accurate manner.

[0059] Based on this, the present invention provides a method for measuring core reactivity using a periodic method, which is described in detail below with reference to the accompanying drawings.

[0060] Figure 3 A schematic flow chart of a method for measuring core reactivity using a periodic method provided in an embodiment of the present invention.

[0061] like Figure 3 As shown, the method for measuring core reactivity using the periodic method comprises the following steps:

[0062] Step S10, when the core is at different times, obtaining the out-of-core nuclear measurement parameters and thermal parameters at the corresponding times.

[0063] In step S10, the out-of-core nuclear measurement parameters include the source range count rate, the intermediate range current value, and the power range power value.

[0064] In step S10, the thermal parameters include core thermal power, the difference between outlet temperature and zero power temperature, and the difference between average temperature and zero power temperature.

[0065] Step S20, determines whether the extra-core nuclear measurement system is in a credible period. If the extra-core nuclear measurement system is in a credible period, obtains a first target reactor cycle based on different times and corresponding extra-core nuclear measurement parameters, and calculates the core reactivity based on the first target reactor cycle using a periodic method.

[0066] In step S20, the external-core nuclear measurement system is in a trustworthy period, which refers to a period in which the external-core nuclear measurement system operates normally or no alarm signal is detected.

[0067] In step S20, a first target reactor cycle is obtained based on different moments and corresponding extra-core nuclear measurement parameters, including: calculating the ratio of a first extra-core nuclear measurement parameter at a first moment to a second extra-core nuclear measurement parameter at a second moment; calculating the time difference between the second moment and the first moment; and calculating the first target reactor cycle based on the time difference and the ratio of the extra-core nuclear measurement parameters.

[0068] That is, the first target reactor cycle satisfies:

[0069] T1=(t2-t1) / Ln(A2 / A1)(7)

[0070] Wherein, T1 is the first target reactor cycle, t1 is the first moment, t2 is the second moment, A1 is the ex-core nuclear measurement parameter of the ex-core nuclear measurement system when the core is in the state of the first moment (i.e., the first ex-core nuclear measurement parameter), and A2 is the ex-core nuclear measurement parameter of the ex-core nuclear measurement system when the core is in the state of the second moment (i.e., the second ex-core nuclear measurement parameter). The first moment and the second moment can be selected at any time, so that the first target reactor cycle within any time interval can be obtained.

[0071] In step S20, considering that the extra-core nuclear measurement parameters include three parameters: source range count rate, intermediate range current value, and power range power value, when using formula (7) to calculate the first extra-core nuclear measurement parameter and the second extra-core nuclear measurement parameter, the same parameter among the extra-core nuclear measurement parameters needs to be selected for calculation.

[0072] It should be noted that if the first target reactor cycle calculated using the three parameters among the off-core nuclear measurement parameters are inconsistent, the first target reactor cycle calculated using the corresponding parameter among the three parameters is selected based on the different core powers.

[0073] Step S30, if the off-core nuclear measurement system is in an untrustworthy period and the core is in a steady state or quasi-static state, a second target reactor cycle is obtained based on different times and corresponding thermal parameters, and the core reactivity is calculated based on the second target reactor cycle using a periodic method.

[0074] In step S30, the ex-core nuclear measurement system is in an untrustworthy period, i.e., the ex-core nuclear measurement system is operating abnormally or an alarm signal is detected. The core is in a steady state or quasi-static state, which means that the core thermal power is proportional to the core neutron flux level, and the change rate is the same in the same time interval. When the core is in a steady state or quasi-static state, the change of the core neutron flux can be quickly fed back to the thermal parameters.

[0075] In step S30, a second target reactor cycle is obtained based on different moments and corresponding thermal parameters, including: calculating a thermal parameter ratio of a first thermal parameter at a first moment to a second thermal parameter at a second moment; calculating a time difference between the second moment and the first moment; and calculating the second target reactor cycle based on the time difference and the thermal parameter ratio.

[0076] That is, the second target reactor cycle satisfies:

[0077] T2=(t2-t1) / Ln(B2 / B1)(8)

[0078] Wherein, T2 is the second target reactor cycle, B1 is the thermal parameter when the core is in the state of the first moment (i.e., the first thermal parameter), and B2 is the thermal parameter when the core is in the state of the second moment (i.e., the second thermal parameter). The first moment and the second moment can be selected at any time, so that the second target reactor cycle within any time interval can be obtained.

[0079] In step S30, considering that the thermal parameters include the core thermal power, the difference between the outlet temperature and the zero power temperature, and the difference between the average temperature and the zero power temperature, when using formula (8) to calculate, the first thermal parameter and the second thermal parameter need to select the same parameter among the thermal parameters for calculation.

[0080] It should be noted that if the second target reactor period calculated using the three parameters in the thermal parameters are inconsistent, the second target reactor period calculated based on the core thermal power shall prevail.

[0081] In an embodiment of the present invention, the period method used may be the inverse time equation of formula (6). That is, the first target reactor period or the second target reactor period obtained is substituted into formula (6) to calculate the core reactivity.

[0082] The periodic method used for the core reactivity may also select a period-reactivity table. Specifically, the obtained first target reactor period or second target reactor period is brought into the completed period-reactivity table to interpolate and calculate the core reactivity.

[0083] In some embodiments, taking the thermal parameters as an example, the core thermal power is selected. Figure 4 A schematic diagram of a specific flow chart of a method for measuring core reactivity using a periodic method provided in an embodiment of the present invention.

[0084] like Figure 4 As shown, the method of measuring core reactivity using the periodic method includes:

[0085] Step 101, when the core is in the state at time t1, obtaining the ex-core nuclear measurement parameter A1 and the core thermal power B1 of the ex-core nuclear measurement system;

[0086] Step 102, when the core is in the state at time t2, obtaining the ex-core nuclear measurement parameter A2 and the core thermal power B2 of the ex-core nuclear measurement system;

[0087] Step 103, judging whether the ex-core nuclear testing system is credible according to the working state of the ex-core nuclear testing system or its alarm signal;

[0088] Step 104, during the period when the measured values ​​of the off-core nuclear measurement system are credible, the off-core nuclear measurement parameters A1 and A2 are used to calculate an arbitrary time interval period according to formula (7), and the period is the first target reactor period;

[0089] Step 105, during the period when the measured value of the external nuclear measurement system is unreliable, determining whether the core is in a steady state or a quasi-static state;

[0090] Step 106, if the core is in a transient state and the measured value of the external nuclear measurement system is not credible, the cycle cannot be calculated, and the process ends;

[0091] Step 107, when the core is in a steady state or quasi-static state, use the core thermal powers B1 and B2 to calculate an arbitrary time interval period according to formula (8), and this period is the second target reactor period;

[0092] Step 108, using the above-calculated period to solve the core reactivity according to the inverse time equation, or using the completed period-reactivity table to interpolate and calculate the core reactivity.

[0093] Figure 5 This is a reactor parameter curve diagram provided by an embodiment of the present invention. Figure 6 This is a reactor calculation cycle curve diagram provided by an embodiment of the present invention. Taking a nuclear power unit participating in power grid peak regulation as an example, since the reactor power changes very slowly, the reactor can be regarded as being in a steady state, and its reactor parameters are shown in Figure 5 . Figure 5 The change of reactor nuclear power and thermal parameters such as reactor thermal power (also called core thermal power) reflected by the external nuclear measurement parameters is shown. During the power change process, the external nuclear measurement system is in a reliable state. Figure 5 The reactor nuclear power and reactor thermal power are calculated periodically according to the above steps, and the calculation results are as follows: Figure 6 shown.

[0094] In order to implement the above embodiment, the present invention also proposes a system for measuring core reactivity using a periodic method.

[0095] Figure 7 A block diagram of a system for measuring core reactivity using a periodic method provided by an embodiment of the present invention.

[0096] like Figure 7 As shown, the system for measuring core reactivity using the periodic method includes an acquisition module 11, a first calculation module 12 and a second calculation module 13, wherein:

[0097] The acquisition module 11 is used to acquire the external nuclear measurement parameters and thermal parameters at the corresponding time when the core is at different time;

[0098] The first calculation module 12 is used to determine whether the ex-core nuclear measurement system is in a credible period. If the ex-core nuclear measurement system is in a credible period, a first target reactor cycle is obtained based on different time points and corresponding ex-core nuclear measurement parameters, and a period method is used to calculate the core reactivity based on the first target reactor cycle.

[0099] The second calculation module 13 is used to obtain the second target reactor period based on different times and corresponding thermal parameters if the off-core nuclear measurement system is in an untrustworthy period and the core is in a steady state or quasi-static state, and to calculate the core reactivity based on the second target reactor period using a periodic method.

[0100] Furthermore, in a possible implementation of the embodiment of the present invention, in the acquisition module 11, the out-of-core nuclear measurement parameters include a source range count rate, an intermediate range current value, and a power range power value.

[0101] Furthermore, in a possible implementation of the embodiment of the present invention, in the acquisition module 11, the thermal parameters include core thermal power, the difference between the outlet temperature and the zero-power temperature, and the difference between the average temperature and the zero-power temperature.

[0102] Furthermore, in a possible implementation of an embodiment of the present invention, in the first calculation module 12, a first target reactor cycle is obtained based on different moments and corresponding extra-core nuclear measurement parameters, including: calculating the ratio of a first extra-core nuclear measurement parameter at a first moment to a second extra-core nuclear measurement parameter at a second moment; calculating the time difference between the second moment and the first moment; and calculating the first target reactor cycle based on the time difference and the ratio of the extra-core nuclear measurement parameters.

[0103] Furthermore, in a possible implementation of an embodiment of the present invention, in the second calculation module 13, a second target reactor cycle is obtained based on different moments and corresponding thermal parameters, including: calculating a thermal parameter ratio of a first thermal parameter at a first moment to a second thermal parameter at a second moment; calculating a time difference between the second moment and the first moment; and calculating the second target reactor cycle based on the time difference and the thermal parameter ratio.

[0104] Furthermore, in a possible implementation manner of the embodiment of the present invention, the periodic method used selects the inverse time equation.

[0105] Furthermore, in a possible implementation manner of the embodiment of the present invention, a periodic method is used to select a period-reactivity table.

[0106] It should be noted that the above explanation of the embodiment of the method for measuring core reactivity using the periodic method is also applicable to the system for measuring core reactivity using the periodic method of this embodiment, and will not be repeated here.

[0107] In an embodiment of the present invention, when the core is at different times, the ex-core nuclear measurement parameters and thermal parameters at the corresponding times are obtained; it is determined whether the ex-core nuclear measurement system is in a credible period. If the ex-core nuclear measurement system is in a credible period, the first target reactor cycle is obtained based on the different times and the corresponding ex-core nuclear measurement parameters, and the core reactivity is calculated based on the first target reactor cycle by using the periodic method; if the ex-core nuclear measurement system is in an untrustworthy period and the core is in a steady state or quasi-static state, the second target reactor cycle is obtained based on the different times and the corresponding thermal parameters, and the core reactivity is calculated based on the second target reactor cycle by using the periodic method. In this case, when the ex-core nuclear measurement system is in a credible period, the first target reactor cycle can be obtained by using the different times and the corresponding ex-core nuclear measurement parameters, and then the core reactivity is calculated by combining the periodic method. When the ex-core nuclear measurement system is in an untrustworthy period and the core is in a steady state or quasi-static state, the ex-core nuclear measurement system and the reactivity instrument cannot provide the reactor cycle in a timely and accurate manner, and the second target reactor cycle is obtained based on the different times and the corresponding thermal parameters, and then the core reactivity is calculated by combining the periodic method. Therefore, it is possible to accurately and quickly calculate the reactor cycle and reactivity when the off-core nuclear measurement system and the reactivity instrument cannot provide the reactor cycle and reactivity period in a timely and accurate manner. The method of the present invention can accurately and quickly calculate the reactor core reactivity. The method is simple to implement, the results are stable and reliable, and can be promoted for use.

[0108] In order to implement the above embodiments, the present invention also proposes an electronic device, comprising: a processor, and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the method provided by the above embodiments.

[0109] In order to implement the above embodiments, the present invention further proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the methods provided by the above embodiments.

[0110] In order to implement the above embodiments, the present invention further provides a computer program product, including a computer program, which implements the methods provided by the above embodiments when executed by a processor.

[0111] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0112] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0113] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0114] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0115] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0116] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0117] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0118] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for measuring core reactivity using a periodic method, characterized in that: include: When the core is at different times, obtain the corresponding out-of-core nuclear measurement parameters and thermal parameters; Determine whether the ex-core nuclear measurement system is in a credible period. If the ex-core nuclear measurement system is in a credible period, obtain a first target reactor cycle based on different times and corresponding ex-core nuclear measurement parameters, and calculate the core reactivity based on the first target reactor cycle using a period method; If the off-core nuclear measurement system is in an untrustworthy period and the core is in a steady state or quasi-static state, a second target reactor cycle is obtained based on different times and corresponding thermal parameters, and the core reactivity is calculated using a periodic method based on the second target reactor cycle.

2. The method for measuring core reactivity using the periodic method according to claim 1, characterized in that: The out-of-core nuclear measurement parameters include source range count rate, intermediate range current value, and power range power value.

3. The method for measuring core reactivity using the periodic method according to claim 1, characterized in that: The thermal parameters include core thermal power, the difference between outlet temperature and zero power temperature, and the difference between average temperature and zero power temperature.

4. The method for measuring core reactivity using the periodic method according to claim 1, characterized in that: The obtaining of a first target reactor cycle based on different time instants and corresponding off-core nuclear measurement parameters includes: Calculate the ratio of a first ex-core nuclear measurement parameter at a first moment to a second ex-core nuclear measurement parameter at a second moment; Calculate the time difference between the second moment and the first moment; A first target reactor period is calculated based on the time difference and the ratio of the external nuclear measurement parameter.

5. The method for measuring core reactivity using the periodic method according to claim 1, characterized in that: The obtaining of a second target reactor cycle based on different times and corresponding thermal parameters includes: Calculate a thermal parameter ratio of a first thermal parameter at a first moment to a second thermal parameter at a second moment; Calculate the time difference between the second moment and the first moment; A second target reactor period is calculated based on the time difference and the thermal parameter ratio.

6. The method for measuring core reactivity using the periodic method according to claim 1, characterized in that: The periodic method used is the inverse time equation.

7. The method for measuring core reactivity using the periodic method according to claim 1, characterized in that: The periodic method used selects the periodic-reactivity table.

8. A system for measuring core reactivity using a periodic method, characterized in that: include: An acquisition module is used to acquire the out-of-core nuclear measurement parameters and thermal parameters at the corresponding time when the core is at different times; a first calculation module, for determining whether the off-core nuclear measurement system is in a credible period; if the off-core nuclear measurement system is in a credible period, obtaining a first target reactor cycle based on different times and corresponding off-core nuclear measurement parameters, and calculating the core reactivity based on the first target reactor cycle using a period method; The second calculation module is used to obtain a second target reactor period based on different times and corresponding thermal parameters if the off-core nuclear measurement system is in an untrustworthy period and the core is in a steady state or quasi-static state, and to calculate the core reactivity based on the second target reactor period using a periodic method.

9. An electronic device, characterized in that: include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 7 when executed by a processor.

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