Measurement equipment and method for fission gas and medium

Abstract

The invention provides fission gas measuring equipment, a fission gas measuring method and a medium, and the fission gas measuring equipment comprises a fuel element which is located in a hot chamber; the sample collecting device is located in the hot chamber and used for collecting sample gas from the sample gas and fission gas of the fuel element; the spectrum measuring device comprises a spectrograph, a laser device and a light receiver, the spectrograph and the laser device are arranged outside the hot chamber, the light receiver is arranged inside the hot chamber and connected with the spectrograph, and the control device is used for controlling the laser device to send laser to the sample collecting device so as to excite the sample gas to generate plasma; receiving spectral signals of the plasma through a light receiver, and converging the spectral signals to a spectrograph to generate spectral information corresponding to the spectral signals; and determining the content of each component in the fission gas based on the spectral information and a calibration curve taking the sample gas as an internal standard element, and further determining the total amount of each component in the fission gas. According to the embodiment of the invention, the safety of fission gas measurement can be improved.

Description

Technical Field

[0001] The present application relates to the field of nuclear technology applications, and in particular to a fission gas measurement device, method and medium. Background Art

[0002] During the irradiation of the fuel in the reactor, fission gas will be produced and continuously released into the gas cavity of the fuel element, which will increase the internal pressure of the element and reduce the thermal conductivity, seriously affecting the performance of the fuel element, and is an important factor affecting the safe operation of the reactor. Therefore, the measurement of fission gas of fuel elements is an important part of the inspection of fuel elements after irradiation.

[0003] Current fission gas measurements are usually based on gas chromatography, but the fission gas needs to be sent to a gas chromatograph located in the front area of ​​the hot chamber for measurement and analysis, which increases the risk of radiation to operators and there is a risk of fission gas leaking into the front area of ​​the hot chamber, resulting in low safety performance. Summary of the invention

[0004] The embodiments of the present application provide a fission gas measurement device, method and medium, which can improve the safety of fission gas measurement.

[0005] In a first aspect, an embodiment of the present application provides a fission gas measurement device, comprising:

[0006] Fuel elements, located inside the hot chamber;

[0007] A sample collection device is located inside the hot chamber, the sample collection device is arranged adjacent to the fuel element, the sample collection device is used to collect sample gas from the sample gas and the fission gas of the fuel element, and the light collector is used to collect spectral signals;

[0008] A spectrum measuring device, comprising a spectrometer, a laser and a light receiver, wherein the spectrometer and the laser are arranged outside the heat chamber, the light receiver is arranged inside the heat chamber, and the light receiver is connected to the spectrometer;

[0009] A control device is used to control the laser to send laser to the sample collection device to excite the sample gas to generate plasma; receive the spectral signal of the plasma through the light receiver, and converge it to the spectrometer to generate spectral information corresponding to the spectral signal; based on the spectral information and a calibration curve with the sample gas as an internal standard element, determine the content of each component in the fission gas, and then determine the total amount of each component in the fission gas.

[0010] The fission gas measurement device provided according to the first aspect of the embodiment of the present application has at least the following beneficial effects: the spectral measurement device includes a spectrometer, a laser and a light receiver, wherein the light receiver is located inside the hot chamber and is arranged adjacent to the sample collection device, while the spectrometer and the laser are located outside the hot chamber. Therefore, when measuring the fission gas, it is only necessary to control the laser to emit laser to the sample collection device to excite the sample gas to generate plasma, and then receive the spectral signal of the plasma through the light receiver and converge it to the spectrometer to generate spectral information corresponding to the spectral signal, so as to analyze the sample gas and further realize the measurement of the fission gas. This process can directly receive the spectral signal inside the hot chamber without leading the fission gas to the outside of the hot chamber, thereby improving the safety of the fission gas measurement.

[0011] According to some embodiments of the present application, the sample collection device comprises:

[0012] A puncture cavity, wherein the puncture cavity is sleeved on one end of the fuel element;

[0013] A sample cavity, wherein the sample cavity is connected to the puncture cavity, and the sample cavity and the light outlet of the laser are located on the same horizontal line, and the light receiver is arranged adjacent to the sample cavity;

[0014] a first pressure gauge, the first pressure gauge being disposed between the puncture cavity and the sample cavity;

[0015] A second pressure gauge is arranged on the air inlet pipe of the sample chamber.

[0016] According to some embodiments of the present application, the sample collection device further includes:

[0017] a first solenoid valve, one end of which is connected to the sample cavity, and the other end of which is connected to the puncture cavity;

[0018] A second solenoid valve is connected to the gas inlet pipeline of the sample chamber, and the second solenoid valve is used to control the sample gas to be input into the sample chamber.

[0019] According to some embodiments of the present application, the sample collection device further includes a piercer, and the piercer is disposed above the piercing cavity, and the piercer is located above the fuel element.

[0020] In a second aspect, an embodiment of the present application provides a fission gas measurement method, which is applied to a fission gas measurement device, wherein the measurement device includes a fuel element, a sample collection device, and a spectrum measurement device, wherein the fuel element is located inside a hot chamber, the sample collection device is located inside the hot chamber, and the sample collection device is arranged adjacent to the fuel element, and the spectrum measurement device includes a spectrometer, a laser, and a light receiver, wherein the spectrometer and the laser are arranged outside the hot chamber, the light receiver is arranged inside the hot chamber, and the light receiver is connected to the spectrometer, and the measurement method includes:

[0021] controlling the sample collection device to collect sample gas from the sample gas and the fission gas of the fuel element;

[0022] Controlling the laser to send laser to the sample collection device to excite the sample gas to generate plasma;

[0023] The optical receiver receives the spectrum signal of the plasma and converges the spectrum signal to the spectrometer to generate spectrum information corresponding to the spectrum signal;

[0024] Determining the content of each component in the fission gas based on the spectral information and a calibration curve using the sample gas as an internal standard element;

[0025] The product of the content of each component in the fission gas and the volume of the element gas cavity of the fuel element is taken as the total amount of each component in the fission gas.

[0026] According to some embodiments of the present application, the sample collection device further includes a puncture cavity, a sample cavity and a puncturer, the puncture cavity is sleeved at one end of the fuel element, the puncture cavity is communicated with the sample cavity, and the control of the sample collection device to collect sample gas from the sample gas and the fission gas of the fuel element includes:

[0027] Controlling the piercer to emit laser light to the portion of the fuel element located in the piercing cavity to pierce the fuel element, thereby causing the fission gas to diffuse into the sample cavity;

[0028] The sample gas is introduced into the sample chamber until the pressure value of the sample chamber reaches the set pressure value of the calibration curve with the sample gas as the internal standard element, thereby obtaining the sample gas.

[0029] According to some embodiments of the present application, before controlling the sample collection device to collect sample gas from the sample gas and the fission gas of the fuel element, the method further includes: evacuating the sample cavity and the puncture cavity; inflating the evacuated sample cavity to obtain a first pressure of the sample cavity; controlling the gas in the sample cavity to diffuse into the puncture cavity to obtain a second pressure of the sample cavity and the puncture cavity; determining a first volume of the puncture cavity based on the first pressure, the second pressure and a preset volume of the sample cavity;

[0030] Before taking the product of the content of each component in the fission gas and the volume of the component gas cavity of the fuel element as the total amount of each component in the fission gas, the method further comprises: performing a secondary vacuum treatment on the sample cavity and the puncture cavity; inflating the sample cavity after the secondary vacuum treatment to obtain a third pressure of the sample cavity; controlling the gas in the sample cavity to diffuse into the puncture cavity to obtain a fourth pressure of the sample cavity and the puncture cavity; and determining the second volume of the puncture cavity and the component gas cavity of the fuel element based on the third pressure, the fourth pressure and the preset volume of the sample cavity;

[0031] The difference between the second volume and the first volume is taken as the element air cavity volume of the fuel element.

[0032] According to some embodiments of the present application, before controlling the piercer to emit laser light to the portion of the fuel element located in the piercing cavity, the method further includes:

[0033] Passing calibration gas into the sample chamber, wherein the calibration gas includes known contents of the sample gas and various components of the fission gas;

[0034] Controlling the laser to send laser to the sample chamber to excite the calibration gas to generate sample plasma;

[0035] The sample spectrum signal of the plasma is received by the light receiver, and converged to the spectrometer to generate sample spectrum information corresponding to the sample spectrum signal;

[0036] Based on the sample spectral information, a calibration curve is formulated with the sample gas as an internal standard element.

[0037] According to some embodiments of the present application, determining the content of each component in the fission gas based on the spectral information and a calibration curve using the sample gas as an internal standard element includes:

[0038] determining a first signal intensity of the sample gas in the spectral information based on a first wavelength of the sample gas;

[0039] determining, in the spectrum information, a second signal intensity of each component in the fission gas based on a second wavelength of each component in the fission gas;

[0040] The content of each component in the fission gas is obtained by searching on a calibration curve using the sample gas as an internal standard element according to the ratio of the second signal intensity of each component in the fission gas to the first signal intensity.

[0041] In a third aspect, an embodiment of the present application provides a computer storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the fission gas measurement method as described in any one of the second aspects is implemented.

[0042] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings are used to provide further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0044] Figure 1 is a schematic diagram of a fission gas measurement device provided in an embodiment of the present application;

[0045] Figure 2 is an overall flow chart of the fission gas measurement method provided in the embodiment of the present application;

[0046] Figure 3 yes Figure 2 A flow chart of collecting sample gas in step S100;

[0047] Figure 4 is a flow chart for determining the element gas cavity volume of a fuel element provided in an embodiment of the present application;

[0048] Figure 5 is a flow chart for determining a calibration curve provided in an embodiment of the present application;

[0049] Figure 6 yes Figure 2 A flow chart of step S500 for determining the content of each component in the fission gas.

[0050] Reference numerals:

[0051] Hot chamber 100;

[0052] Fuel element 200;

[0053] Sample collection device 300; puncture cavity 310; sample cavity 320; first pressure gauge 330; second pressure gauge 340; first solenoid valve 350; second solenoid valve 360; puncture device 370;

[0054] Spectrometer 410; laser 420; light receiver 430;

[0055] Control device 500. DETAILED DESCRIPTION

[0056] In the following description, specific details such as specific system structures, technologies, etc. are proposed for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the embodiments of the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from hindering the description of the embodiments of the present application.

[0057] It should be noted that although a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than that in the flowchart. The terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0058] It should also be understood that the references to "one embodiment" or "some embodiments" described in the specification of the embodiments of the present application mean that one or more embodiments of the embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Thus, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0059] In the description of this application, greater than, less than, exceed, etc. are understood to exclude the number itself, and above, below, within, etc. are understood to include the number itself. If there is a description of first and second, it is only for the purpose of distinguishing the technical features, and it cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features. It should be understood that the orientation description, such as up, down, front, back, left, right, etc., the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0060] During the irradiation of the fuel in the reactor, fission gas will be produced and continuously released into the gas cavity of the fuel element, which will increase the internal pressure of the element and reduce the thermal conductivity, seriously affecting the performance of the fuel element, and is an important factor affecting the safe operation of the reactor. Therefore, the measurement of fission gas of fuel elements is an important part of the inspection of fuel elements after irradiation.

[0061] Current fission gas measurements are usually based on gas chromatography, but the fission gas needs to be sent to a gas chromatograph located in the front area of ​​the hot chamber for measurement and analysis, which increases the risk of radiation to operators and there is a risk of fission gas leaking into the front area of ​​the hot chamber, resulting in low safety performance.

[0062] Based on this, the present application provides a fission gas measurement device, method and medium. When measuring the fission gas, the fission gas measurement device provided in the embodiment of the present application only needs to control the laser to emit laser to the sample collection device to excite the sample gas to generate plasma, and then receive the spectral signal of the plasma through the light receiver and converge it to the spectrometer to generate spectral information corresponding to the spectral signal to analyze the sample gas, thereby realizing the measurement of the fission gas. This process can directly receive the spectral signal inside the hot chamber without leading the fission gas out of the hot chamber, thereby improving the safety of the fission gas measurement.

[0063] The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0064] Reference Figure 1 The fission gas measurement device provided in the embodiment of the present application includes a fuel element 200, a sample collection device 300, a spectrum measurement device and a control device 500.

[0065] The fuel element 200 is located inside the hot chamber 100 .

[0066] The sample collection device 300 is located inside the hot chamber 100 . The sample collection device 300 is disposed adjacent to the fuel element 200 . The sample collection device 300 is used to collect sample gas from the sample gas and the fission gas of the fuel element 200 .

[0067] The spectral measurement device includes a spectrometer 410, a laser 420 and a light receiver 430. The spectrometer 410 and the laser 420 are arranged outside the hot chamber 100, and the light receiver 430 is arranged inside the hot chamber 100. The light receiver 430 is connected to the spectrometer 410 and is used to collect spectral signals.

[0068] The control device 500 is used to control the laser 420 to send laser to the sample collection device 300 to excite the sample gas to generate plasma; receive the spectral signal of the plasma through the light receiver 430, and converge it to the spectrometer 410 to generate spectral information corresponding to the spectral signal; based on the spectral information and the calibration curve with the sample gas as the internal standard element, determine the content of each component in the fission gas, and then determine the total amount of each component in the fission gas.

[0069] It should be noted that the fuel element 200, also known as the nuclear fuel element 200, is the smallest structurally independent component in the reactor with nuclear fuel as the main component, and generally refers to a fuel-using unit with an independent structure in a nuclear reactor. The fuel element 200 generally refers to a fuel unit composed of a fuel pellet and a cladding, such as a fuel rod, a fuel plate, and a fuel ball. 235 U and other nuclides generate fission gas during the fission process, most of which is stored in the irradiated fuel element 200 pellets, and a small part is released into the gap between the pellets and the cladding.

[0070] It should be noted that the hot chamber 100 is a shielded room for high-radioactivity testing and operations, which plays a role of safety shielding in a radioactive environment. Therefore, the fuel element 200 and the fission gas generated by the fission of the nuclear fuel are preferably located inside the hot chamber 100 to reduce radiation to the outside to ensure safety.

[0071] It should be noted that the sample collection device 300 is a device for collecting sample gas from the sample gas and the fission gas of the fuel element 200. The sample collection device 300 in the embodiment of the present application is located inside the hot chamber 100, and the sample gas can be collected only inside the hot chamber 100.

[0072] It should be noted that the spectrum measurement device is used to measure and analyze the spectrum of the sample gas. The fission gas can be further analyzed by the measurement and analysis results of the sample gas. The spectrum measurement device specifically includes a spectrometer 410, a laser 420 and a light receiver 430, wherein the spectrometer 410 and the laser 420 are arranged outside the hot chamber 100, and the light receiver 430 is arranged inside the hot chamber 100.

[0073] It should be noted that the laser 420 can emit laser light to the sample collection device 300, thereby controlling the sample gas in the sample collection device 300 to be ionized and generate plasma. In addition, the laser 420 and the sample collection device 300 are respectively arranged on both sides of the observation window of the hot chamber 100, so that the laser light emitted by the laser 420 can pass through the observation window to the sample collection device 300. And the material of the sample collection device 300 needs to be set to quartz glass, which can facilitate the laser light to pass through on the basis of preventing radiation damage, thereby ensuring that the laser light can normally excite the sample gas in the sample collection device 300 to generate plasma.

[0074] It should be noted that the light receiver 430 is arranged adjacent to the sample collection device 300. After the sample gas in the sample collection device 300 generates plasma, the spectrum signal of the plasma can be received by the light receiver 430 and converged to the spectrometer 410. The spectrometer 410 is an instrument that decomposes light with complex components into spectral lines. It can decompose the spectral signal received by the light receiver 430 into multiple spectral lines, thereby determining the spectral information of the multiple spectral lines. The spectral information includes at least wavelength and signal intensity. Then, according to the wavelength of each spectral line, its corresponding signal intensity can be determined, thereby facilitating the analysis of the sample gas.

[0075] The light receiver 430 and the spectrometer 410 cooperate with each other to obtain the spectral information contained in the spectral signal corresponding to the sample gas. The light receiver 430 is located inside the hot chamber 100, and the spectrometer 410 is located outside the hot chamber 100. The light receiver 430 and the spectrometer 410 are connected by an optical fiber. The sample signal only needs to be ionized inside the hot chamber 100 to complete the reception of the spectral signal. This process does not require the fission gas or sample gas to be led out of the hot chamber 100, which can reduce the risk of fission gas leakage, reduce the risk of radiation to operators, and improve the safety of the measurement process.

[0076] It should be noted that the control device 500 is connected to the sample collection device 300 and the spectrum measurement device, and can control the sample collection device 300 to sample the sample gas and the fission gas in the fuel element 200, so as to obtain the sample gas, and can determine the wavelength and signal intensity of each component in the sample gas from the spectrometer 410 in the spectrum measurement device, that is, the spectrum information, and determine the content of each component in the sample gas based on the spectrum information and the calibration curve, and then determine the content of each component in the fission gas. The product of the content of each component in the fission gas and the volume of the element gas cavity, that is, the volume of the fission gas, can be used as the total amount of each component in the fission gas.

[0077] It should be noted that the content of each component in the fission gas can be understood as the ratio of the volume of each component to the total volume. For example, if the volume of the fission gas is 20 ml, and the content of krypton (Kr) is 40%, then the volume of krypton is 8 ml.

[0078] Since the sample gas includes sample gas in addition to part of the fission gas, the total content of the fission gas in the sample gas is determined first based on the content of the sample gas, and then the content of each component in the fission gas is determined based on the ratio of the content of each component in the sample gas to the total content of the fission gas in the sample gas. For example, in the measurement result of the sample gas, the content of the sample gas is 20%, the content of krypton is 40%, and the content of krypton in the fission gas is 50%. The product of the content of each component in the fission gas and the volume of the fission gas can be used as the total amount of each component in the fission gas.

[0079] It should be noted that the calibration curve is pre-established. In order to ensure the accuracy and safety of the calibration curve, the embodiment of the present application uses a sample collection device 300 inside the hot chamber 100 to formulate the calibration curve. The main components of fission gas are krypton (Kr) and xenon (Xe). In the measurement process of fission gas, krypton and xenon are mainly measured and analyzed. Then, multiple groups of calibration gases containing known contents of krypton, xenon and sample gas are used, and the contents of krypton and xenon in the multiple groups of calibration gases are different. Afterwards, the spectral information corresponding to the calibration gas is analyzed to formulate a calibration curve, which is used to represent the relationship between the content of krypton and xenon and their signal intensity and the signal intensity of the sample gas.

[0080] In addition, in the process of establishing the calibration curve, in order to obtain a stronger signal, the pressure of the sample collection device 300 is greater than or equal to 1 bar, and the pressures of multiple groups of calibration gases during measurement and analysis are the same.

[0081] It should be noted that the sample gas cannot be any of the fission gases, and the sample gas cannot react with any of the components in the fission gases. Therefore, the embodiment of the present disclosure uses helium (He) as the sample gas.

[0082] It should be noted that the present embodiment uses the internal standard method to determine the content of each component in the sample gas. The calibration curve corresponding to krypton can be expressed as: Kr / I He =a1x1+b1, where I Kr is the signal intensity of krypton, which can be determined on the spectrometer 410 according to the wavelength of krypton 811.23 nanometers, and the signal intensity of the corresponding spectral line, I Heis the signal intensity of the spectral line corresponding to the sample gas helium, the wavelength of the sample gas helium is 706.519 nanometers, x1 is the krypton content, which is expressed in percentage, a1 and b1 are constants determined based on multiple groups of calibration gases with known contents. The calibration curve corresponding to xenon can be expressed as I Xe / I He =a2x2+b2, where I Xe is the signal intensity of xenon, which can determine the signal intensity of the corresponding spectral line on the spectrometer 410 according to the wavelength of krypton 823.16 nanometers, x2 is the xenon content, which is expressed in percentage, and a2 and b2 are constants determined according to multiple groups of different known calibration gases. According to the calibration curve and spectral information, the content of krypton, xenon and sample gas in the sample gas can be determined.

[0083] It should be noted that the spectrum measurement device of the above embodiment includes a spectrometer 410, a laser 420 and a light receiver 430, wherein the light receiver 430 is located inside the hot chamber 100 and is arranged adjacent to the sample collection device 300, while the spectrometer 410 and the laser 420 are located outside the hot chamber 100. Therefore, when measuring the fission gas, it is only necessary to control the laser 420 to emit laser light to the sample collection device 300 to excite the sample gas to generate plasma, and then the spectrum signal of the plasma is received by the light receiver 430 and converged to the spectrometer 410 to generate new spectrum information corresponding to the spectrum signal, so as to analyze the sample gas and further realize the measurement of the fission gas. This process can directly receive the spectrum signal inside the hot chamber 100 without leading the fission gas to the outside of the hot chamber 100, thereby improving the safety of the fission gas measurement.

[0084] It is understandable that, referring to Figure 1 The sample collection device 300 includes a puncture cavity 310 , a sample cavity 320 , a first pressure gauge 330 and a second pressure gauge 340 .

[0085] The puncture cavity 310 is sleeved on one end of the fuel element 200 .

[0086] The sample cavity 320 is communicated with the sample cavity 320 , and the sample cavity 320 and the light outlet of the laser 420 are located on the same horizontal line, and the light receiver 430 is disposed adjacent to the sample cavity 320 .

[0087] The first pressure gauge 330 is disposed between the puncture cavity 310 and the sample cavity 320 .

[0088] The second pressure gauge 340 is disposed on the air inlet pipe of the sample chamber 320 .

[0089] It should be noted that the sample cavity 320 is a container for storing sample gas in the sample collection device 300. The puncture cavity 310 is sleeved on one end of the fuel element 200, and the puncture cavity 310 is connected with the sample cavity 320, and the puncture cavity 310 serves to connect the sample cavity 320 with the gas cavity of the fuel element 200, so that the fission gas can diffuse into the sample cavity 320.

[0090] It should be noted that the sample cavity 320 and the light outlet of the laser 420 are located on the same horizontal line, so the laser emitted by the laser 420 can accurately reach the sample cavity to stimulate the ionization of the sample gas and generate plasma. The light receiver 430 is arranged adjacent to the sample cavity 320, and the spectrum signal of the plasma can be received by the light receiver 430.

[0091] It should be noted that the material of the sample chamber 320 can be set to quartz glass to ensure that the laser emitted by the laser 420 can act on the sample gas and ensure that the light receiver 430 can collect the spectral signal.

[0092] It should be noted that the first pressure gauge 330 is disposed between the puncture cavity 310 and the sample cavity 320, and is specifically used to detect the pressure in the puncture cavity 310. The second pressure gauge 340 is connected to the air inlet pipe of the sample cavity 320, and is specifically used to detect the pressure in the sample cavity 320.

[0093] It should be noted that before the fission gas in the fuel element 200 diffuses into the puncture cavity 310, the volume of the puncture cavity 310 can be determined by the first pressure gauge 330 and the second pressure gauge 340. Specifically, the sample cavity 320 and the puncture cavity 310 are first vacuumed. After that, the connecting channel between the sample cavity 320 and the puncture cavity 310 is closed, and a certain amount of gas is flushed into the sample cavity 320, and the first pressure of the sample cavity 320 is determined by the second pressure gauge 340. Then, the sample cavity 320 and the puncture cavity 310 are controlled to communicate with each other, so that a certain amount of gas in the sample cavity 320 diffuses into the puncture cavity 310, and the pressure of the sample cavity 320 can be determined by the second pressure gauge 340, and the pressure of the puncture cavity 310 is determined by the first pressure gauge 330. At this time, the puncture cavity 310 and the sample cavity 320 are connected, and the detection results of the first pressure gauge 330 and the second pressure gauge 330 are the same, and the result is used as the second pressure. Since the quantitative gas satisfies the formula P1V1=P2V2, P1 can be regarded as the first pressure, V1 can be regarded as the preset volume of the sample cavity 320, P2 can be regarded as the second pressure, and V2 can be regarded as the volume sum of the sample cavity 320 and the puncture cavity 310. Then, according to the first pressure, the second pressure and the preset volume of the sample cavity 320, the first volume of the puncture cavity 310 can be determined. Similarly, after determining the content of each component in the sample cavity 320, that is, the fission gas in the fuel element 200 diffuses into the puncture cavity 310, the second volume of the puncture cavity 310 and the element gas cavity can be determined by the first pressure gauge 330 and the second pressure gauge 340. The second volume can be regarded as the volume sum of the puncture cavity 310 and the element gas cavity of the fuel element 200, and then the difference between the second volume and the first volume is used as the volume of the element gas cavity of the fuel element 200.

[0094] It should be noted that, in order to ensure the safety of the fission gas measurement process, the gas used when filling the sample chamber 320 cannot be any of the fission gases, and the sample gas cannot react with any of the components in the fission gas. Therefore, the embodiment of the present disclosure uses helium (He) gas to fill the sample chamber 320.

[0095] It should be noted that the sample cavity 320 is used in the embodiment of the present application to prepare the calibration curve. At this time, the puncture cavity 310 and the sample cavity 320 can be controlled to be in a non-connected state, so that the sample cavity 320 becomes a separate sealed container. To ensure the accuracy of the calibration curve, the sample cavity 320 needs to be evacuated first, so that the sample cavity 320 is in a vacuum state to reduce the influence of other gases. Then, multiple groups of calibration gases with known contents of krypton, xenon and sample gas are introduced into the sample cavity 320.

[0096] It is understandable that, referring to Figure 1The sample collection device 300 further includes a first solenoid valve 350 and a second solenoid valve 360 ​​.

[0097] One end of the first solenoid valve 350 is connected to the sample chamber 320 , and the other end of the first solenoid valve 350 is connected to the puncture chamber 310 .

[0098] The second solenoid valve 360 ​​is connected to the air inlet pipeline of the sample chamber 320 , and the second solenoid valve 360 ​​is used to control the sample gas to be input into the sample chamber 320 .

[0099] It should be noted that the sample collection device 300 also includes a first solenoid valve 350 and a second solenoid valve 360, wherein the first solenoid valve 350 is used to control the communication between the sample cavity 320 and the puncture cavity 310, and the second solenoid valve 360 ​​is used to control the communication between the sample cavity 320 and the air intake pipe.

[0100] The first solenoid valve 350 is a two-way valve, one end of which is connected to the sample cavity 320, and the other end is connected to the puncture cavity 310. When the first solenoid valve 350 is opened, the sample cavity 320 and the puncture cavity 310 are in a connected state, and when the first solenoid valve 350 is closed, the sample cavity 320 and the puncture cavity 310 are in a non-connected state.

[0101] The second solenoid valve 360 ​​is connected to the air inlet pipe of the sample cavity 320. When measuring the fission gas of the fuel element 200, the second solenoid valve 360 ​​is mainly used to control the sample gas to enter the sample cavity 320. In addition, the sample cavity 320 is also used to measure the volume of the element gas cavity and to formulate a calibration curve. Therefore, the second solenoid valve 360 ​​can be set as a four-way valve, the first end of the second solenoid valve 360 ​​is connected to the sample cavity 320, and the second end of the second solenoid valve 360 ​​is used as an outlet, which is mainly used to vacuum the sample cavity 320 and the puncture cavity 310. In addition, the embodiment of the present application can inflate the sample with helium, and use helium as the sample gas, so the third end of the second solenoid valve 360 ​​can be used as the inlet of helium. In the process of formulating the calibration curve, it is necessary to pass a mixed gas of krypton and xenon with a known concentration into the sample cavity 320, so the fourth end of the second solenoid valve 360 ​​can be used as the inlet of the mixed gas.

[0102] It is understandable that, referring to Figure 1 The sample collection device 300 further includes a piercer, which is disposed above the piercing cavity 310 and is located above the fuel element 200 .

[0103] It should be noted that the sample collection device 300 also includes a piercer, which is used to pierce the fuel element 200 so that the fission gas in the element gas cavity of the fuel element 200 is released from the fuel element 200, so as to facilitate the measurement of the fission gas.

[0104] In addition, the puncture cavity 310 in the sample collection device 300 is sleeved on the fuel element 200. In order to allow the fission gas in the fuel element 200 to diffuse into the puncture cavity 310, the puncture position of the fuel element 200 needs to be located at the part of the fuel element 200 inside the puncture cavity 310.

[0105] It should be noted that in the embodiment of the present application, the piercer is disposed above the piercing cavity 310, and the piercer is located above the fuel element 200. Then, after the piercer is controlled to pierce the fuel element 200, the fission gas is released from the fuel element 200 into the piercing cavity 310, and then diffused into the sample cavity 320 to obtain part of the sample gas.

[0106] It should be noted that, in order to ensure the accuracy of fission gas measurement, when sampling the fission gas, the second solenoid valve 360 ​​between the sample chamber 320 and the air inlet pipe may be closed.

[0107] It should be noted that after the fission gas sampling is completed, the first solenoid valve 350 can be closed, and the sample gas can be input into the sample chamber 320 through the second solenoid valve 360 ​​to keep the pressure of the sample chamber 320 consistent with the pressure when the calibration curve was established.

[0108] It should be noted that the piercer may be a laser nozzle, which pierces the fuel element 200 by emitting laser.

[0109] It should be noted that the piercer can also be installed at other positions in the heat chamber 100, such as below the piercing cavity 310, as long as it is ensured that the laser generated by the piercer does not contact other devices.

[0110] It should be noted that the fission gas measuring device of the embodiment of the present application includes a fuel element 200, a sample collection device 300, a spectrum measuring device and a control device 500, wherein the sample collection device 300 includes a piercing cavity 310, a sample cavity 320, a first pressure gauge 330, a second pressure gauge 340, a first solenoid valve 350, a second solenoid valve 360 ​​and a piercer, and the spectrum measuring device includes a spectrometer 410, a laser 420 and a light receiver 430. All devices in the fuel element 200 and the sample collection device 300 are located inside the hot chamber 100, while the light receiver 430 in the spectrum measuring device is located inside the hot chamber 100, and the spectrometer 410, the laser 420 and the control device 500 are located outside the hot chamber 100. In the process of measuring fission gas, firstly, a calibration curve is prepared through the sample chamber 320 and the spectrum measuring device. The calibration curve uses helium as the internal standard element. The calibration gas is introduced into the sample chamber, and the laser 420 is controlled to send laser to the sample chamber to ionize the laser calibration gas, thereby generating plasma. The sample spectrum signal of the plasma is received by the light receiver 430, and converged to the spectrometer 410 to generate sample spectrum information corresponding to the sample spectrum signal. Since the calibration gas includes various components in the fission gas with known contents (such as krypton and xenon) and the sample gas, and the sample spectrum information includes the wavelength and signal intensity of krypton, xenon and helium, a calibration curve with the sample gas as the internal standard element can be prepared according to the sample spectrum information. Afterwards, the first volume of the puncture cavity 310 is measured through the first pressure gauge 330, the second pressure gauge 340 and the sample cavity 320 with a known preset volume. Then, the perforator located above the fuel element 200 is controlled to perforate the fuel element 200, so that the fission gas in the gas cavity of the element is released into the perforation cavity 310, and then into the sample cavity 320, so as to sample the fission gas, and helium is introduced into the sample cavity 320 through the second solenoid valve 360 ​​and the air inlet pipe, so that the pressure of the sample cavity 320 is consistent with the pressure when the calibration curve is formulated, and the sample gas is obtained. The control device 500 controls the laser 420 to send laser to the sample cavity 320 to excite the sample gas to generate plasma, and receives the spectrum signal of the plasma through the light receiver 430, so as to converge to the spectrometer 410 to generate spectrum information corresponding to the spectrum signal, and determines the content of each component in the sample gas according to the spectrum information and the calibration curve with the sample gas as the internal standard element, that is, the content of krypton and xenon in the sample gas, and then determines the content of krypton and xenon in the fission gas. At this time, the second volume of the puncture cavity 310 can be measured by the first pressure gauge 330, the second pressure gauge 340 and the sample cavity 320 of known preset volume, and the difference between the second volume and the first volume is used as the volume of the element gas cavity. The total content of krypton and xenon is obtained based on the volume of the element gas cavity and the product of the content of krypton and xenon in the fission gas. In this process, the fission gas can be measured without leading the fission gas to the outside of the hot chamber 100, which improves the safety of the measurement process.

[0111] It should be noted that, in order to ensure the accuracy of the measurement, the fission gas can be sampled multiple times to calculate the content of each component in the fission gas multiple times, and the average value or arithmetic mean of the calculation results is used as the final content of each component in the fission gas.

[0112] In addition, the embodiment of the present application also provides a method for measuring fission gas, which is applied to a fission gas measuring device, the measuring device comprising a fuel element 200, a sample collection device 300 and a spectrum measuring device, the fuel element 200 is located inside the hot chamber 100, the sample collection device 300 is located inside the hot chamber 100, the sample collection device 300 is arranged adjacent to the fuel element 200, the spectrum measuring device comprises a spectrometer 410, a laser 420 and a light receiver 430, the spectrometer 410 and the laser 420 are arranged outside the hot chamber 100, the light receiver 430 is arranged inside the hot chamber 100, and the light receiver 430 is connected to the spectrometer 410. Figure 2 The fission gas measurement method provided in the embodiment of the present application includes but is not limited to the following steps:

[0113] Step S100: Control the sample collection device to collect sample gas from the sample gas and the fission gas of the fuel element.

[0114] Step S200: Control the laser to send laser to the sample collection device to excite the sample gas to generate plasma.

[0115] Step S300: Receive the spectrum signal of the plasma through a light receiver, and converge it to a spectrometer to generate spectrum information corresponding to the spectrum signal.

[0116] Step S400: Determine the content of each component in the fission gas based on the spectral information and a calibration curve using the sample gas as an internal standard element.

[0117] Step S500: taking the product of the content of each component in the fission gas and the volume of the fuel element gas cavity as the total amount of each component in the fission gas.

[0118] It should be noted that the fission gas measurement equipment includes a fuel element 200, a sample collection device 300 and a spectrum measurement device. Nuclides such as 235U in the nuclear fuel generate fission gas during the fission process, most of which are stored in the pellets of the irradiated fuel element 200, and a small part is released into the gap between the pellets and the cladding. The sample collection device 300 refers to a device for collecting sample gas from the sample gas and the fission gas of the fuel element 200. The sample collection device 300 in the embodiment of the present application is located inside the hot chamber 100, and the sample gas can be collected only inside the hot chamber 100.

[0119] The spectrum measuring device is used to measure and analyze the spectrum of the sample gas. The fission gas can be further analyzed by the measurement and analysis results of the sample gas. The spectrum measuring device specifically includes a spectrometer 410, a laser 420 and a light receiver 430, wherein the spectrometer 410 and the laser 420 are arranged outside the hot chamber 100, and the light receiver 430 is arranged inside the hot chamber 100.

[0120] It should be noted that the laser 420 can emit laser light to the sample collection device 300, thereby controlling the sample gas in the sample collection device 300 to be ionized and generate plasma. In addition, the laser 420 and the sample collection device 300 are respectively arranged on both sides of the observation window of the hot chamber 100, so that the laser light emitted by the laser 420 can pass through the observation window to the sample collection device 300. And the material of the sample collection device 300 needs to be set to quartz glass, which can facilitate the laser light to pass through on the basis of preventing radiation damage, thereby ensuring that the laser light can normally excite the sample gas in the sample collection device 300 to generate plasma.

[0121] It should be noted that the light receiver 430 is arranged adjacent to the sample collection device 300. After the sample gas in the sample collection device 300 generates plasma, the spectrum signal of the plasma can be received by the light receiver 430 and converged to the spectrometer 410. The spectrometer 410 is an instrument that decomposes light with complex components into spectral lines. It can decompose the spectral signal received by the light receiver 430 into multiple spectral lines, thereby determining the spectral information of the multiple spectral lines. The spectral information includes at least wavelength and signal intensity. Then, according to the wavelength of each spectral line, its corresponding signal intensity can be determined, thereby facilitating the analysis of the sample gas.

[0122] The light receiver 430 and the spectrometer 410 cooperate with each other to obtain the spectral information contained in the spectral signal corresponding to the sample gas. The light receiver 430 is located inside the hot chamber 100, and the spectrometer 410 is located outside the hot chamber 100. The light receiver 430 and the spectrometer 410 are connected by an optical fiber. The sample signal only needs to be ionized inside the hot chamber 100 to complete the reception of the spectral signal. This process does not require the fission gas or sample gas to be led out of the hot chamber 100, which can reduce the risk of fission gas leakage, reduce the risk of radiation to operators, and improve the safety of the measurement process.

[0123] Since the sample gas includes sample gas in addition to part of the fission gas, the total content of the fission gas in the sample gas is determined first based on the content of the sample gas, and then the content of each component in the fission gas is determined based on the ratio of the content of each component in the sample gas to the total content of the fission gas in the sample gas. For example, in the measurement result of the sample gas, the content of the sample gas is 20%, the content of krypton is 40%, and the content of krypton in the fission gas is 50%. The product of the content of each component in the fission gas and the volume of the fission gas can be used as the total amount of each component in the fission gas.

[0124] It should be noted that the sample gas cannot be any of the fission gases, and the sample gas cannot react with any of the components in the fission gases. Therefore, the embodiment of the present disclosure uses helium (He) as the sample gas.

[0125] It should be noted that the spectrum measurement device of the above embodiment includes a spectrometer 410, a laser 420 and a light receiver 430, wherein the light receiver 430 is located inside the hot chamber 100 and is arranged adjacent to the sample collection device 300, while the spectrometer 410 and the laser 420 are located outside the hot chamber 100. Therefore, when measuring the fission gas, it is only necessary to control the laser 420 to emit laser light to the sample collection device 300 to excite the sample gas to generate plasma, and then the spectrum signal of the plasma is received by the light receiver 430 and converged to the spectrometer 410 to generate new spectrum information corresponding to the spectrum signal, so as to analyze the sample gas and further realize the measurement of the fission gas. This process can directly receive the spectrum signal inside the hot chamber 100 without leading the fission gas to the outside of the hot chamber 100, thereby improving the safety of the fission gas measurement.

[0126] It is understandable that, referring to Figure 1 The sample collection device 300 further includes a puncture cavity 310, a sample cavity 320 and a puncturer. The puncture cavity 310 is sleeved on one end of the fuel element 200, and the puncture cavity 310 is connected to the sample cavity 320. Figure 3 Step S100 includes but is not limited to the following steps:

[0127] Step S110, controlling the piercer to emit laser light to the portion of the fuel element located in the piercing cavity, so as to pierce the fuel element, thereby allowing the fission gas to diffuse into the sample cavity.

[0128] Step S120 , passing the sample gas into the sample cavity until the pressure value of the sample cavity reaches the set pressure value of the calibration curve with the sample gas as the internal standard element, thereby obtaining the sample gas.

[0129] It should be noted that the sample cavity 320 is a container for storing sample gas in the sample collection device 300. The puncture cavity 310 is sleeved on one end of the fuel element 200, and the puncture cavity 310 is connected with the sample cavity 320, and the puncture cavity 310 serves to connect the sample cavity 320 with the gas cavity of the fuel element 200. Then, after the fuel element 200 is punctured by the puncturer, the fission gas can diffuse into the sample cavity 320.

[0130] It should be noted that the sample gas is introduced into the sample chamber 320 until the pressure value of the sample chamber 320 reaches the specified pressure value of the calibration curve with the sample gas as the internal standard element, so that the environment in which the sample gas is ionized is the same as the environment in which the calibration gas is ionized, so that the concentration of the fission gas in the sample gas can be determined by the calibration curve.

[0131] It should be noted that the air inlet pipe of the sample chamber 320 is connected to the second solenoid valve 360 ​​, and the sample gas can be introduced into the sample chamber 320 by controlling the second solenoid valve 360 ​​.

[0132] It is understandable that, referring to Figure 4 Before step S100, the method provided in the embodiment of the present application further includes:

[0133] Step S610: vacuum the sample cavity and the puncture cavity.

[0134] Step S620: Inflate the vacuumed sample cavity to obtain a first pressure of the sample cavity.

[0135] Step S630: Control the gas in the sample cavity to diffuse into the puncture cavity, and obtain a second pressure of the sample cavity and the puncture cavity.

[0136] Step S640: Determine a first volume of the puncture cavity based on the first pressure, the second pressure, and a preset volume of the sample cavity.

[0137] Before step S500, the method provided in the embodiment of the present application further includes:

[0138] Step S650: perform a secondary vacuum treatment on the sample cavity and the puncture cavity.

[0139] Step S660: Inflate the sample cavity after the second vacuuming to obtain a third pressure of the sample cavity.

[0140] Step S670: Control the gas in the sample cavity to diffuse into the puncture cavity, and obtain a fourth pressure of the sample cavity and the puncture cavity.

[0141] Step S680: Determine the second volume of the puncture cavity and the element air cavity of the fuel element based on the third pressure, the fourth pressure and the preset volume of the sample cavity.

[0142] Step S690: taking the difference between the second volume and the first volume as the element air cavity volume of the fuel element.

[0143] It should be noted that before the fission gas in the fuel element 200 diffuses into the puncture cavity 310, the volume of the puncture cavity 310 can be determined. Specifically, the sample cavity 320 and the puncture cavity 310 are first vacuumed. After that, the connecting passage between the sample cavity 320 and the puncture cavity 310 is closed, and a certain amount of gas is flushed into the sample cavity 320 to determine the first pressure of the sample cavity 320. Then, the sample cavity 320 and the puncture cavity 310 are controlled to communicate with each other so that a certain amount of gas in the sample cavity 320 diffuses into the puncture cavity 310, and the second pressures of the sample cavity 320 and the puncture cavity 310 are determined. Since the quantitative gas satisfies the formula P1V1=P2V2, P1 can be regarded as the first pressure, V1 can be regarded as the preset volume of the sample cavity 320, P2 can be regarded as the second pressure, and V2 can be regarded as the sum of the volumes of the sample cavity 320 and the puncture cavity 310. Then, according to the first pressure, the second pressure and the preset volume of the sample cavity 320, the first volume of the puncture cavity 310 can be determined. Similarly, after determining the content of each component in the sample cavity 320, that is, after the fission gas in the fuel element 200 diffuses into the puncture cavity 310, the second volume of the puncture cavity 310 and the element gas cavity can be determined. The second volume can be regarded as the sum of the volumes of the puncture cavity 310 and the element gas cavity of the fuel element 200, and then the difference between the second volume and the first volume is used as the volume of the element gas cavity of the fuel element 200.

[0144] It should be noted that the embodiment of the present application is provided with a first solenoid valve 350 and a second solenoid valve 360, one end of the first solenoid valve 350 is connected to the sample cavity 320, and the other end of the first solenoid valve 350 is connected to the puncture cavity 310. The second solenoid valve 360 ​​is connected to the air inlet pipe of the sample cavity 320, and the second solenoid valve 360 ​​is used to control the input of the sample gas into the sample cavity 320. The embodiment of the present application controls the communication between the sample cavity 320 and the puncture cavity 310 through the first solenoid valve 350, and controls the second solenoid valve 360 ​​to inflate the sample cavity 320, and to evacuate the sample cavity 320 and the puncture cavity 310.

[0145] It should be noted that, in order to ensure the safety of the fission gas measurement process, the gas used when filling the sample chamber 320 cannot be any of the fission gases, and the sample gas cannot react with any of the components in the fission gas. Therefore, the embodiment of the present disclosure uses helium (He) gas to fill the sample chamber 320.

[0146] It is understandable that, referring to Figure 5Before step S100, the method provided in the embodiment of the present application further includes:

[0147] Step S710: Before controlling the piercer to emit laser light to the portion of the fuel element located in the piercing cavity, a calibration gas is introduced into the sample chamber, wherein the calibration gas includes a sample gas with a known content and various components of the fission gas.

[0148] Step S720: Control the laser to send laser to the sample chamber to excite the calibration gas to generate sample plasma.

[0149] Step S730: Receive the sample spectrum signal of the plasma through the light receiver, and converge it to the spectrometer to generate sample spectrum information corresponding to the sample spectrum signal.

[0150] Step S740: Based on the sample spectrum information, a calibration curve is formulated with the sample gas as the internal standard element.

[0151] It should be noted that in the calibration gas, the contents of the various components of the sample gas and the fission gas are known. The main components of the fission gas are krypton (Kr) and xenon (Xe). In the measurement process of the fission gas, krypton and xenon are mainly measured and analyzed. Then, the calibration curve is prepared using the calibration gas containing known contents of krypton, xenon and sample gas.

[0152] It should be noted that, in the process of developing the calibration curve, in order to obtain a stronger signal, the pressure of the sample chamber is greater than or equal to 1 bar, and the pressures of multiple groups of calibration gases during measurement and analysis are the same.

[0153] It should be noted that the wavelength and signal intensity corresponding to each component of the sample gas and fission gas can be determined through the sample spectrum information.

[0154] In addition, the calibration curve uses the sample gas as the internal standard element. Specifically, the embodiment of the present application can obtain multiple sets of sample spectral information through multiple sets of calibration gases including different contents of fission gas. A coordinate axis is established with the content as the horizontal axis and the ratio of the signal intensity of each component in the fission gas to helium as the vertical axis, so as to determine multiple coordinate points on the coordinate axis based on the multiple sets of sample spectral information, and fit the multiple coordinate points to obtain a calibration curve. The calibration curve corresponding to krypton can be expressed as I Kr / I He =a1x1+b1, where I Kr is the signal intensity of krypton, which can be determined on the spectrometer 410 according to the wavelength of krypton 811.23 nanometers, and the signal intensity of the corresponding spectral line, I Heis the signal intensity of the spectral line corresponding to the sample gas helium, the wavelength of the sample gas helium is 706.519 nanometers, x1 is the krypton content, which is expressed in percentage, a1 and b1 are constants determined based on multiple groups of calibration gases with known contents. The calibration curve corresponding to xenon can be expressed as I Xe / I He =a2x2+b2, where I Xe is the signal intensity of xenon, which can determine the signal intensity of the corresponding spectral line on the spectrometer 410 according to the wavelength of krypton 823.16 nanometers, x2 is the xenon content, which is expressed in the form of percentage, and a2 and b2 are constants determined according to multiple groups of different known calibration gases.

[0155] It should be noted that the embodiment of the present application uses the sample gas as the internal standard element to formulate a calibration curve, and the obtained calibration curve is more accurate, thereby improving the accuracy of fission gas measurement.

[0156] It is understandable that, referring to Figure 6 Step S500 includes but is not limited to the following steps:

[0157] Step S510: Determine a first signal intensity of the sample gas in the spectrum information based on a first wavelength of the sample gas.

[0158] Step S520: Determine the second signal intensity of each component in the fission gas in the spectrum information based on the second wavelength of each component in the fission gas.

[0159] Step S530: search on a calibration curve using the sample gas as an internal standard element according to the ratio of the second signal intensity of each component in the fission gas to the first signal intensity, and obtain the content of each component in the fission gas.

[0160] It should be noted that the first wavelength is the wavelength of the sample gas, which is determined by the sample gas itself. The spectrum information includes wavelength and signal strength, so the first signal strength of the sample gas can be determined by searching in the spectrum information based on the first wavelength of the sample gas.

[0161] It should be noted that the second wavelength is the wavelength of each component in the fission gas, namely krypton and xenon, and the second signal intensities of krypton and xenon are further determined in the spectrum information.

[0162] Since the calibration curve corresponding to krypton is expressed as I Kr / I He =a1x1+b1, the calibration curve corresponding to xenon is expressed as I Xe / I He=a2x2+b2, then based on the signal intensity ratio of krypton and xenon to helium, the content of krypton and xenon in the sample gas can be determined by searching on the corresponding calibration curve, and then the content of krypton and xenon in the fission gas can be determined. Specifically, based on the ratio of the content of each component in the sample gas to the total content of the fission gas in the sample gas, the content of each component in the fission gas is determined. For example, in the measurement result of the sample gas, the content of the sample gas is 20%, the content of krypton is 40%, and the content of krypton in the fission gas is 50%. The product of the content of each component in the fission gas and the volume of the fission gas can be used as the total amount of each component in the fission gas.

[0163] It should be noted that the fission gas measurement device of the embodiment of the present application includes a fuel element 200, a sample collection device 300, and a spectrum measurement device, wherein the sample collection device 300 includes a piercing cavity 310, a sample cavity 320, and a piercer, and the spectrum measurement device includes a spectrometer 410, a laser 420, and a light receiver 430. All devices in the fuel element 200 and the sample collection device 300 are located inside the hot chamber 100, while the light receiver 430 in the spectrum measurement device is located inside the hot chamber 100, and the spectrometer 410, the laser 420, and the control device 500 are located outside the hot chamber 100. In the process of measuring fission gas, a calibration curve is firstly prepared through the sample chamber 320 and the spectrum measuring device. The calibration curve uses helium as the internal standard element. The calibration gas is introduced into the sample chamber, and the laser 420 is controlled to send laser to the sample chamber to ionize the laser calibration gas, thereby generating plasma. The sample spectrum signal of the plasma is received by the light receiver 430, and converged to the spectrometer 410 to generate sample spectrum information corresponding to the sample spectrum signal. Since the calibration gas includes various components in the fission gas with known contents (such as krypton and xenon) and the sample gas, and the sample spectrum information includes the wavelength and signal intensity of krypton, xenon and helium, a calibration curve using the sample gas as the internal standard element can be prepared according to the sample spectrum information. Afterwards, the first volume of the puncture cavity 310 is measured. Then, the perforator located above the fuel element 200 is controlled to perforate the fuel element 200, so that the fission gas in the element gas cavity is released into the perforation cavity 310, and then into the sample cavity 320, so as to sample the fission gas, and helium is introduced into the sample cavity 320 through the gas inlet pipe of the sample cavity, so that the pressure of the sample cavity 320 is consistent with the pressure when the calibration curve is formulated, and the sample gas is obtained. The control device 500 controls the laser 420 to send laser to the sample cavity 320 to excite the sample gas to generate plasma, and receives the spectrum signal of the plasma through the light receiver 430, so as to converge to the spectrometer 410 to generate spectrum information corresponding to the spectrum signal, and determines the content of each component in the sample gas according to the spectrum information and the calibration curve with the sample gas as the internal standard element, that is, the content of krypton and xenon in the sample gas, and then determines the content of krypton and xenon in the fission gas. At this time, the second volume of the perforation cavity 310 is measured, and the difference between the second volume and the first volume is used as the volume of the element gas cavity. The total content of krypton and xenon is obtained based on the volume of the element gas cavity and the product of the content of krypton and xenon in the fission gas. This process can complete the measurement of the fission gas without leading the fission gas to the outside of the hot chamber 100, thereby improving the safety of the measurement process.

[0164] An embodiment of the present application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, a method for measuring fission gas such as step S100 to step S500 is performed.

[0165] The processor and the memory may be connected via a bus or other means.

[0166] The memory, as a non-transient computer-readable storage medium, can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory may optionally include a memory remotely disposed relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0167] The non-transient software program and instructions required to implement the fission gas measurement method of the above embodiment are stored in the memory. When executed by the processor, the fission gas measurement method of the above embodiment is executed, for example, the above described Figure 2 Method steps S100 to S500 in.

[0168] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0169] In addition, one embodiment of the present application also provides a computer-readable storage medium, which stores computer-executable instructions. The computer-executable instructions are executed by a processor or a controller, so that the processor can execute the fission gas measurement method in the above embodiment, for example, to execute the above described Figure 2 The method steps S100 to S500, Figure 3 Steps S110 to S120, Figure 4 Steps S610 to S690, Figure 4 Steps S710 to S740, Figure 6 Steps S510 to S530 in .

[0170] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage media, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0171] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A fission gas measuring device, characterized in that: include: The fuel element is located inside the hot chamber; A sample collection device, located inside the hot chamber, the sample collection device is arranged adjacent to the fuel element, and the sample collection device is used to collect sample gas from the sample gas and the fission gas of the fuel element; A spectrum measuring device, comprising a spectrometer, a laser and a light receiver, wherein the spectrometer and the laser are arranged outside the heat chamber, the light receiver is arranged inside the heat chamber, the light receiver is connected to the spectrometer, and the light receiver is used to collect spectrum signals; A control device is used to control the laser to send laser to the sample collection device to excite the sample gas to generate plasma; receive the spectral signal of the plasma through the light receiver, and converge it to the spectrometer to generate spectral information corresponding to the spectral signal; based on the spectral information and a calibration curve with the sample gas as an internal standard element, determine the content of each component in the fission gas, and then determine the total amount of each component in the fission gas.

2. The measuring device according to claim 1, characterized in that The sample collection device comprises: A puncture cavity, wherein the puncture cavity is sleeved on one end of the fuel element; A sample cavity, wherein the sample cavity is connected to the puncture cavity, and the sample cavity and the light outlet of the laser are located on the same horizontal line, and the light receiver is arranged adjacent to the sample cavity; a first pressure gauge, the first pressure gauge being disposed between the puncture cavity and the sample cavity; A second pressure gauge is arranged on the air inlet pipe of the sample chamber.

3. The measuring device according to claim 2, characterized in that The sample collection device also includes: a first solenoid valve, one end of which is connected to the sample cavity, and the other end of which is connected to the puncture cavity; A second solenoid valve is connected to the gas inlet pipeline of the sample chamber, and the second solenoid valve is used to control the sample gas to be input into the sample chamber.

4. The measuring device according to claim 2, characterized in that The sample collection device further comprises a piercer, which is arranged above the piercing cavity and is located above the fuel element.

5. A method for measuring fission gas, characterized in that: A measuring device for fission gas, the measuring device comprising a fuel element, a sample collection device and a spectrum measuring device, the fuel element being located inside a hot chamber, the sample collection device being located inside the hot chamber, the sample collection device being arranged adjacent to the fuel element, the spectrum measuring device comprising a spectrometer, a laser and a light receiver, the spectrometer and the laser being arranged outside the hot chamber, the light receiver being arranged inside the hot chamber, the light receiver being connected to the spectrometer, the measuring method comprising: controlling the sample collection device to collect sample gas from the sample gas and the fission gas of the fuel element; Controlling the laser to send laser to the sample collection device to excite the sample gas to generate plasma; The optical receiver receives the spectrum signal of the plasma and converges the spectrum signal to the spectrometer to generate spectrum information corresponding to the spectrum signal; Determining the content of each component in the fission gas based on the spectral information and a calibration curve using the sample gas as an internal standard element; The product of the content of each component in the fission gas and the volume of the element gas cavity of the fuel element is taken as the total amount of each component in the fission gas.

6. The measuring method according to claim 5, characterized in that: The sample collection device further comprises a puncture cavity, a sample cavity and a puncturer, wherein the puncture cavity is sleeved on one end of the fuel element, the puncture cavity is communicated with the sample cavity, and the control of the sample collection device to collect sample gas from the sample gas and the fission gas of the fuel element comprises: Controlling the piercer to emit laser light to the portion of the fuel element located in the piercing cavity to pierce the fuel element, thereby causing the fission gas to diffuse into the sample cavity; The sample gas is introduced into the sample chamber until the pressure value of the sample chamber reaches the set pressure value of the calibration curve with the sample gas as the internal standard element, thereby obtaining the sample gas.

7. The measuring method according to claim 6, characterized in that: Before controlling the sample collection device to collect sample gas from the sample gas and the fission gas of the fuel element, the method further includes: evacuating the sample cavity and the puncture cavity; inflating the evacuated sample cavity to obtain a first pressure of the sample cavity; controlling the gas in the sample cavity to diffuse into the puncture cavity to obtain a second pressure of the sample cavity and the puncture cavity; determining a first volume of the puncture cavity based on the first pressure, the second pressure and a preset volume of the sample cavity; Before taking the product of the content of each component in the fission gas and the volume of the component gas cavity of the fuel element as the total amount of each component in the fission gas, the method further comprises: performing a secondary vacuum treatment on the sample cavity and the puncture cavity; inflating the sample cavity after the secondary vacuum treatment to obtain a third pressure of the sample cavity; controlling the gas in the sample cavity to diffuse into the puncture cavity to obtain a fourth pressure of the sample cavity and the puncture cavity; and determining the second volume of the puncture cavity and the component gas cavity of the fuel element based on the third pressure, the fourth pressure and the preset volume of the sample cavity; The difference between the second volume and the first volume is taken as the element air cavity volume of the fuel element.

8. The measuring method according to claim 6, characterized in that: Before controlling the sample collection device to collect the sample gas from the sample gas and the fission gas of the fuel element, the method further includes: Passing calibration gas into the sample chamber, the calibration gas comprising known contents of the sample gas and various components of the fission gas; Controlling the laser to send laser to the sample chamber to excite the calibration gas to generate sample plasma; The sample spectrum signal of the plasma is received by the light receiver, and converged to the spectrometer to generate sample spectrum information corresponding to the sample spectrum signal; Based on the sample spectral information, a calibration curve is formulated with the sample gas as an internal standard element.

9. The measuring method according to claim 8, characterized in that: The determining the content of each component in the fission gas based on the spectral information and a calibration curve using the sample gas as an internal standard element includes: determining a first signal intensity of the sample gas in the spectrum information based on a first wavelength of the sample gas; determining, in the spectrum information, a second signal intensity of each component in the fission gas based on a second wavelength of each component in the fission gas; The content of each component in the fission gas is obtained by searching on a calibration curve using the sample gas as an internal standard element according to the ratio of the second signal intensity of each component in the fission gas to the first signal intensity.

10. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by a processor, the fission gas measurement method according to any one of claims 5 to 9 is implemented.

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