Fissile gas measurement apparatus, method and medium

Abstract

The application provides a kind of fissile gas measuring equipment, method and medium, comprising: fuel element, inside hot chamber;Sample collection device, inside hot chamber, sample collection device is used to collect sample gas from sample gas and fissile gas of fuel element;Spectrometric measuring device, including spectrometer, laser and light receiver, spectrometer and laser are arranged outside hot chamber, light receiver is arranged inside hot chamber, light receiver is connected with spectrometer, control device is used to control laser to send laser to sample collection device, to excite sample gas to generate plasma;The optical spectrum signal of plasma is received by light receiver, and is gathered to spectrometer to generate the spectral information corresponding to optical spectrum signal;Based on spectral information and with sample gas as internal standard element calibration curve, the content of each component in fissile gas is determined, and then the total amount of each component in fissile gas is determined.The safety of fissile gas measurement can be improved by the embodiment of the application.

Description

TECHNICAL FIELD

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

[0002] Fissile gas is generated during irradiation of fuel in a reactor and is continuously released into the plenum of the fuel element, which increases the internal pressure of the element and reduces the thermal conductivity, seriously affecting the performance of the fuel element and being an important factor affecting the safe operation of the reactor. Therefore, fissile gas measurement of the fuel element is an important part of the post-irradiation examination of the fuel element.

[0003] Current fissile gas measurement is usually based on gas chromatography, but fissile gas needs to be sent into a gas chromatograph located in the front area of the hot cell for measurement and analysis, which increases the risk of radiation to the operator and has the risk of fissile gas leakage into the front area of the hot cell, and the safety performance is low. SUMMARY

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

[0005] In a first aspect, the embodiments of the present application provide a fissile gas measurement device, comprising:

[0006] a fuel element located inside a hot cell;

[0007] a sample collection device located inside the hot cell, the sample collection device being arranged adjacent to the fuel element, the sample collection device being configured to collect sample gas from sample gas and fissile gas of the fuel element, and a light receiver being configured to collect a spectrum signal;

[0008] a spectrum measurement device comprising a spectrometer, a laser and a light receiver, the spectrometer and the laser being arranged outside the hot cell, and the light receiver being arranged inside the hot cell and connected to the spectrometer;

[0009] a control device configured to control the laser to send laser light to the sample collection device to excite the sample gas to generate plasma, receive the spectrum signal of the plasma by the light receiver, and converge the spectrum signal to the spectrometer to generate spectrum information corresponding to the spectrum signal, determine the content of each component in the fissile gas based on the spectrum information and a calibration curve taking the sample gas as an internal standard element, and further determine the total amount of each component in the fissile gas.

[0010] According to the fissile gas measuring device provided in the first aspect of the present application, the spectrum measuring device comprises 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 collecting device, and the spectrometer and the laser are located outside the hot chamber. Therefore, when measuring the fissile gas, the laser only needs to be controlled to emit laser to the sample collecting device to excite the sample gas to generate plasma, and then the light receiver receives the spectrum signal of the plasma and converges to the spectrometer to generate spectrum information corresponding to the spectrum signal, so as to analyze the sample gas and further realize the measurement of the fissile gas. The process can directly receive the spectrum signal inside the hot chamber, without the need of leading the fissile gas out of the hot chamber, thereby improving the safety of the fissile gas measurement.

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

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

[0013] a sample cavity, which is in communication with the puncture cavity, and the light outlet of the laser and the sample cavity are located on the same horizontal line, and the light receiver is arranged adjacent to the sample cavity;

[0014] a first pressure gauge, which is arranged between the puncture cavity and the sample cavity;

[0015] a second pressure gauge, which is arranged in the air inlet pipeline of the sample cavity.

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

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

[0018] a second electromagnetic valve, which is connected with the air inlet pipeline of the sample cavity, and is used for controlling the sample gas to be input into the sample cavity.

[0019] According to some embodiments of the present application, the sample collecting device further comprises a puncture device, which is arranged above the puncture cavity and above the fuel element.

[0020] In a second aspect, the embodiments of the present application provide a fissile gas measurement method, applied to a fissile gas measurement device, the measurement device comprising a fuel element, a sample collection device and a spectrum measurement device, the fuel element being located inside a hot cell, the sample collection device being located inside the hot cell, the sample collection device being arranged adjacent to the fuel element, the spectrum measurement device comprising a spectrometer, a laser and a light receiver, the spectrometer and the laser being arranged outside the hot cell, the light receiver being arranged inside the hot cell, the light receiver being connected to the spectrometer, the measurement method comprising:

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

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

[0023] receiving, by the light receiver, a spectrum signal of the plasma and converging to the spectrometer to generate spectrum information corresponding to the spectrum signal;

[0024] determining, based on the spectrum information and a calibration curve taking the sample gas as an internal standard element, contents of each component in the fissile gas;

[0025] multiplying the contents of each component in the fissile gas by a volume of an element cavity of the fuel element to obtain total amounts of each component in the fissile gas.

[0026] According to some embodiments of the present application, the sample collection device further comprises a puncture cavity, a sample cavity and a puncture device, the puncture cavity is sleeved on one end of the fuel element, the puncture cavity is in communication with the sample cavity, and the controlling the sample collection device to collect sample gas from sample gas and fissile gas of the fuel element comprises:

[0027] controlling the puncture device to emit laser light to a part of the fuel element located in the puncture cavity to puncture the fuel element, so that the fissile gas diffuses to the sample cavity;

[0028] passing sample gas into the sample cavity until a pressure value of the sample cavity reaches a specified pressure value of a calibration curve taking the sample gas as an internal standard element, to obtain sample gas.

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

[0030] Before the multiplying the content of each component in the fission gas by the volume of the element gas chamber of the fuel element to obtain the total amount of each component in the fission gas, the method further comprises: secondary vacuumizing the sample chamber and the puncture chamber; inflating the secondary vacuumized sample chamber to obtain a third pressure of the sample chamber; controlling the gas in the sample chamber to diffuse to the puncture chamber to obtain a fourth pressure of the sample chamber and the puncture chamber; determining a second volume of the puncture chamber and the element gas chamber of the fuel element based on the third pressure, the fourth pressure and the preset volume of the sample chamber;

[0031] Taking the difference between the second volume and the first volume as the volume of the element gas chamber of the fuel element.

[0032] According to some embodiments of the present application, before the controlling the puncture device to emit laser to the part of the fuel element located in the puncture chamber, the method further comprises:

[0033] Introducing a calibration gas into the sample chamber, the calibration gas comprising a known content of the sample gas and each component 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] Receiving, by the light receiver, a sample spectrum signal of the plasma and converging to the spectrometer to generate sample spectrum information corresponding to the sample spectrum signal;

[0036] Based on the sample spectrum information, formulating a calibration curve taking the sample gas as an internal standard element.

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

[0038] Based on a first wavelength of the sample gas, determining a first signal intensity of the sample gas in the spectrum information;

[0039] determining, in the spectral 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] finding, according to a ratio of the second signal intensity to the first signal intensity of each component in the fission gas, on a calibration curve with the sample gas as an internal standard element, a content of each component in the fission gas.

[0041] In a third aspect, an embodiment of the present application provides a computer storage medium, the storage medium storing a computer program, and the computer program is executed by a processor to implement the measurement method of the fission gas according to any one of the second aspect.

[0042] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0043] The accompanying drawings are included to provide a further understanding of embodiments of the present application, and constitute a part of the specification, illustrate embodiments of the present application and are used to explain the technical solutions of the present application, and do not constitute a limitation on the technical solutions of the present application.

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

[0045] Figure 2 is a general flowchart of a fission gas measurement method provided by an embodiment of the present application;

[0046] Figure 3 is Figure 2 is a flowchart of step S100 of collecting a sample gas in the method;

[0047] Figure 4 is a flowchart of determining a volume of a fuel element gas cavity of a fuel element provided by an embodiment of the present application;

[0048] Figure 5 is a flowchart of determining a calibration curve provided by an embodiment of the present application;

[0049] Figure 6 is Figure 2 is a flowchart of step S500 of determining a content of each component in the fission gas in the method.

[0050] Reference signs:

[0051] hot cell 100;

[0052] fuel element 200;

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

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

[0055] Control device 500. DETAILED DESCRIPTION

[0056] In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular architectures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known methods, devices, circuits, and

[0057] It is noted that, although the logical sequence is shown in the flow chart, in some cases, the steps shown or described can be performed in an order different from that shown in the flow chart. The terms "first", "second", and the like, used in the description and in the claims, whose meanings are clear by understanding the context, are used merely for distinguishing between similar objects discussed, and do not necessarily describe a particular sequential or chronological order.

[0058] It is also to be understood that the phraseology "one embodiment" or "some embodiments" used in the specification and throughout this description is not necessarily referring to the same embodiment, but can be referring to one or more embodiments among the several embodiments described. Thus, use of such phraseology is not intended to refer to the same embodiment or to a single embodiment in all cases, but is intended to refer to one or more embodiments among the several embodiments described.

[0059] In the description of the present application, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number. If the first, second is described for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features. It needs to be understood that the position description, such as up, down, front, back, left, right, etc. indicates the position or location relationship based on the position or location relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular position, be constructed and operated in a particular position, and therefore cannot be understood as a limitation on the present application.

[0060] During the irradiation of the fuel in the reactor, fission gas is generated and continuously released into the plenum of the fuel element, increasing the internal pressure of the element and reducing the thermal conductivity, which seriously affects the performance of the fuel element and is an important factor affecting the safe operation of the reactor. Therefore, fission gas measurement of the fuel element is an important part of the post-irradiation examination of the fuel element.

[0061] Current fission gas measurement is usually based on gas chromatography, but the fission gas needs to be sent into the gas chromatograph located in the front area of the hot cell for measurement and analysis, increasing the risk of radiation to the operator, and there is a risk of fission gas leakage into the front area of the hot cell, which has low safety performance.

[0062] Therefore, the present application provides a fission gas measurement device, method and medium. The fission gas measurement device provided by 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 the light spectrum signal of the plasma is received by the light receiver and converged to the spectrometer to generate the spectrum information corresponding to the light spectrum signal, so as to analyze the sample gas and realize the measurement of the fission gas. The process can directly receive the light spectrum signal inside the hot cell without introducing the fission gas out of the hot cell, improving the safety of the fission gas measurement.

[0063] The embodiments of the present application will be further described below with reference to the drawings.

[0064] Referring to Figure 1 The fission gas measurement device provided by 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 cell 100.

[0066] The sample collection device 300 is located inside the hot cell 100, and is arranged 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 spectrum 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 cell 100, and the light receiver 430 is arranged inside the hot cell 100. The light receiver 430 is connected to the spectrometer 410, and is used to collect a spectrum signal.

[0068] The control device 500 is used to control the laser 420 to send laser light to the sample collection device 300, so as to excite the sample gas to generate plasma. The spectrum signal of the plasma is received by the light receiver 430 and is converged to the spectrometer 410 to generate spectrum information corresponding to the spectrum signal. Based on the spectrum information and a calibration curve taking the sample gas as an internal standard element, the content of each component in the fission gas is determined, and then the total amount of each component in the fission gas is determined.

[0069] It should be noted that the fuel element 200, also referred to as the nuclear fuel element 200, is a structureally independent minimum component in a reactor with nuclear fuel as the main component, and generally refers to a fuel use 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 sphere. The nuclear fuel includes U and other nuclides. 235 U and other nuclides in the nuclear fuel produce fission gas in the fission process, most of which is stored in the irradiated fuel element 200 pellet, and a small part is released into the gap between the pellet and the cladding.

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

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

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

[0073] It should be noted that the laser 420 can emit laser to the sample collection device 300, and then control the sample gas in the sample collection device 300 to ionize 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 cell 100, so that the laser 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 as quartz glass, which can facilitate the laser to pass through on the basis of preventing radiation damage, so as to ensure that the laser can normally excite the sample gas in the sample collection device 300 to generate plasma.

[0074] It should be noted that the light collector 430 is arranged adjacent to the sample collection device 300, and after the sample gas in the sample collection device 300 generates plasma, the light collector 430 can receive and converge the spectral signal of the plasma to the spectrometer 410. The spectrometer 410 is an instrument for decomposing complex light into spectral lines, which can decompose the spectral signal received by the light collector 430 into a plurality of spectral lines, so as to determine the spectral information of the plurality of spectral lines. The spectral information at least includes wavelength and signal intensity, so that according to the wavelength of each spectral line, the corresponding signal intensity can be determined, so as to facilitate the analysis of the sample gas.

[0075] The light collector 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 collector 430 is located inside the hot cell 100, and the spectrometer 410 is located outside the hot cell 100. The light collector 430 and the spectrometer 410 are connected through an optical fiber. Only the sample signal needs to be ionized inside the hot cell 100, and the receiving of the spectral signal can be completed. This process does not need to introduce the fission gas or the sample gas out of the hot cell 100, which can reduce the risk of fission gas leakage and the risk of radiation to the operator, and improve the safety of the measurement process.

[0076] It should be noted that the control device 500 is connected with the sample collection device 300 and the spectral measurement device, which 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, that is, the spectral information, from the spectrometer 410 of the spectral measurement device. Based on the spectral information and the calibration curve, the content of each component in the sample gas is determined, and then the content of each component in the fission gas is determined. The product of the content of each component in the fission gas and the volume of the element 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, the volume of the fission gas is 20 ml, and the content of krypton (Kr) is 40%, so the volume of krypton is 8 ml.

[0078] Since the sample gas includes not only the partial fission gas but also the sample gas, the total content of the fission gas in the sample gas is first determined according to 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%, and the content of krypton is 40%, so 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 prepared in advance. In order to ensure the accuracy and safety of the preparation of the calibration curve, the sample collection device 300 inside the hot cell 100 is used to prepare the calibration curve. The main components of the fission gas are krypton (Kr) and xenon (Xe), and during the measurement of the fission gas, krypton and xenon are mainly measured and analyzed. Therefore, a plurality of calibration gases containing known amounts of krypton, xenon and sample gas are used, and the contents of krypton and xenon in the plurality of calibration gases are different. Then, the spectral information corresponding to the calibration gas is analyzed to prepare the calibration curve, which represents the relationship between the content of krypton and xenon and their signal intensity and the signal intensity of the sample gas.

[0080] In addition, during the preparation of 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 (bar), and the pressure of the plurality of calibration gases during the measurement and analysis is the same.

[0081] It should be noted that the sample gas cannot be any gas in the fission gas, and the sample gas cannot react with any component in the fission gas. Therefore, the helium (He) gas is used as the sample gas in the embodiments of the present disclosure.

[0082] It should be noted that the content of each component in the sample gas is determined by the internal standard method in the embodiments of the present application. 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 according to the signal intensity of the corresponding spectral line of krypton with a wavelength of 811.23 nanometers on the spectrometer 410, I HeFor the signal intensity of the sample gas helium corresponding spectrum line, the wavelength of the sample gas helium is 706.519 nanometers, x1 is the content of krypton, which is expressed in the form of percentage, and a1 and b1 are constants determined according to a plurality of known content calibration gases. The calibration curve corresponding to xenon can be expressed as I Xe / I He =a2x2+b2, wherein I Xe is the signal intensity of xenon, which can be determined according to the signal intensity of the corresponding spectrum line at the wavelength of 823.16 nanometers of krypton on the spectrometer 410, x2 is the content of xenon, which is expressed in the form of percentage, and a2 and b2 are constants determined according to a plurality of different known calibration gases. According to the calibration curve and the spectral information, the contents of krypton, xenon and sample gas in the sample gas can be determined.

[0083] It should be noted that the spectral measurement device of the above embodiment includes the spectrometer 410, the laser 420 and the light receiver 430, wherein the light receiver 430 is located inside the hot cell 100 and is arranged adjacent to the sample collection device 300, and the spectrometer 410 and the laser 420 are located outside the hot cell 100. Therefore, when measuring the fissile gas, only the laser 420 needs to be controlled to emit laser to the sample collection device 300 to excite the sample gas to generate plasma, and then the light receiver 430 receives the spectral signal of the plasma and converges to the spectrometer 410 to generate spectral information corresponding to the spectral signal, so as to analyze the sample gas and realize the measurement of the fissile gas. The process can directly receive the spectral signal inside the hot cell 100, without the need to lead the fissile gas out of the hot cell 100, thereby improving the safety of the fissile gas measurement.

[0084] It can be understood that, with reference to Figure 1 , the sample collection device 300 includes a piercing cavity 310, a sample cavity 320, a first pressure gauge 330 and a second pressure gauge 340.

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

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

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

[0088] The second pressure gauge 340 is arranged in the air inlet pipeline of the sample cavity 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 in communication with the sample cavity 320. The puncture cavity 310 functions to communicate the sample cavity 320 and the fuel element 200 gas cavity, so that the fission gas can diffuse to 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 that the laser emitted by the laser 420 can accurately reach the sample chamber to excite the sample gas ionization to generate plasma. The light receiver 430 is arranged adjacent to the sample cavity 320, and the light receiver 430 can receive the spectrum signal of the plasma.

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

[0092] It should be noted that the first pressure gauge 330 is arranged between the puncture cavity 310 and the sample cavity 320, and the first pressure gauge 330 is specifically used for detecting the pressure in the puncture cavity 310. The second pressure gauge 340 is connected with the gas inlet pipeline of the sample cavity 320, and the second pressure gauge 340 is specifically used for detecting the pressure in the sample cavity 320.

[0093] It should be noted that before the fissile 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, first, the sample cavity 320 and the puncture cavity 310 are subjected to vacuumization. Then, the connecting channel between the sample cavity 320 and the puncture cavity 310 is closed, and a certain amount of gas is injected 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 connected to allow the certain amount of gas in the sample cavity 320 to diffuse 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 can be determined by the first pressure gauge 330. At this time, the puncture cavity 310 and the sample cavity 320 are connected, the detection results of the first pressure gauge 330 and the second pressure gauge 330 are the same, and the result is taken as the second pressure. Since the certain amount of 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 of the sample cavity 320 and the puncture cavity 310. Therefore, 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, i.e., after the fissile gas in the fuel element 200 diffuses into the puncture cavity 310, the second volume of the puncture cavity 310 and the element cavity of the fuel element 200 can be determined by the first pressure gauge 330 and the second pressure gauge 340. The second volume can be regarded as the volume of the puncture cavity 310 and the element cavity of the fuel element 200, and the difference between the second volume and the first volume is taken as the volume of the element cavity of the fuel element 200.

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

[0095] It should be noted that the embodiment of the present application uses the sample cavity 320 to make the calibration curve. At this time, the puncture cavity 310 and the sample cavity 320 can be controlled to be in a non-communicating state, so that the sample cavity 320 becomes a separate sealed container. In order to ensure the accuracy of the calibration curve, the sample cavity 320 needs to be subjected to vacuumization first, so that the sample cavity 320 is in a vacuum state, reducing the influence of other gases. Then, a plurality of groups of calibration gas with known content of krypton, xenon and sample gas are introduced into the sample cavity 320.

[0096] It can be understood that, with reference to Figure 1The sample collection device 300 further comprises a first electromagnetic valve 350 and a second electromagnetic valve 360.

[0097] The first electromagnetic valve 350 is connected to the sample cavity 320 at one end and to the puncture cavity 310 at the other end.

[0098] The second electromagnetic valve 360 is connected to the gas inlet pipeline of the sample cavity 320, and is used to control the input of sample gas into the sample cavity 320.

[0099] It should be noted that the sample collection device 300 further comprises a first electromagnetic valve 350 and a second electromagnetic valve 360, wherein the first electromagnetic valve 350 is used to control the communication between the sample cavity 320 and the puncture cavity 310, and the second electromagnetic valve 360 is used to control the communication between the sample cavity 320 and the gas inlet pipeline.

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

[0101] The second electromagnetic valve 360 is connected to the gas inlet pipeline of the sample cavity 320, and is mainly used to control the input of sample gas into the sample cavity 320 during the measurement of the fissile gas of the fuel element 200. In addition, the sample cavity 320 is also used for the measurement of the volume of the element gas cavity and the establishment of a calibration curve. Therefore, the second electromagnetic valve 360 can be provided as a four-way valve, the first end of the second electromagnetic valve 360 is connected to the sample cavity 320, the second end of the second electromagnetic valve 360 is used as a gas outlet, which is mainly used for vacuumizing the sample cavity 320 and the puncture cavity 310. In addition, the sample can be filled with helium gas in the present application, and the helium gas is used as sample gas, so that the third end of the second electromagnetic valve 360 can be used as a helium gas inlet. During the establishment of the calibration curve, a mixed gas of known concentration of krypton gas and xenon gas needs to be input into the sample cavity 320, so that the fourth end of the second electromagnetic valve 360 can be used as a mixed gas inlet.

[0102] It should be understood that, with reference to Figure 1 The sample collection device 300 further comprises a puncture device, which is arranged above the puncture cavity 310 and above the fuel element 200.

[0103] It should be noted that the sample collection device 300 further comprises a puncture device for puncturing the fuel element 200 to release the fission gas in the element plenum of the fuel element 200 from the fuel element 200, facilitating 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, and the puncture position of the fuel element 200 needs to be located on the part of the fuel element 200 in the puncture cavity 310 so that the fission gas in the fuel element 200 can diffuse into the puncture cavity 310.

[0105] It should be noted that the puncture device is arranged above the puncture cavity 310 and above the fuel element 200 in the embodiment of the present application, so that after the puncture device punctures the fuel element 200, the fission gas is released from the fuel element 200 into the puncture cavity 310 and then diffuses 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 the measurement of the fission gas, the second electromagnetic valve 360 between the sample cavity 320 and the gas inlet pipe can be closed when the fission gas is sampled.

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

[0108] It should be noted that the puncture device can be a laser nozzle which punctures the fuel element 200 by emitting laser.

[0109] It should be noted that the puncture device can also be installed at other positions in the hot cell 100, for example, below the puncture cavity 310, as long as the laser generated by the puncture device does not contact other devices.

[0110] It should be noted that the fissile gas measuring device of the embodiment of the present application comprises a fuel element 200, a sample collection device 300, a spectrum measuring device and a control device 500, wherein the sample collection device 300 comprises a puncture cavity 310, a sample cavity 320, a first pressure gauge 330, a second pressure gauge 340, a first electromagnetic valve 350, a second electromagnetic valve 360 and a puncture device, and the spectrum measuring device comprises 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 cell 100, and the light receiver 430 in the spectrum measuring device is located inside the hot cell 100, while the spectrometer 410, the laser 420 and the control device 500 are located outside the hot cell 100. In the fissile gas measuring process, first, a calibration curve is established by the sample cavity 320 and the spectrum measuring device, the calibration curve takes helium as an internal standard element, the calibration gas is introduced into the sample cavity, and the laser 420 is controlled to send laser to the sample cavity to ionize the laser calibration gas, so as to generate plasma, the sample spectrum signal of the plasma is received by the light receiver 430 and gathered to the spectrometer 410 to generate sample spectrum information corresponding to the sample spectrum signal. Since the calibration gas comprises components (such as krypton and xenon) in the fissile gas with known content and sample gas, and the sample spectrum information comprises the wavelength and signal intensity of krypton, xenon and helium, a calibration curve taking the sample gas as an internal standard element can be established according to the sample spectrum information. Then, the first volume of the puncture cavity 310 is measured by the first pressure gauge 330, the second pressure gauge 340 and the sample cavity 320 with a known preset volume. Then, the puncture device located above the fuel element 200 is controlled to puncture the fuel element 200, so that the fissile gas in the element gas cavity is released into the puncture cavity 310 and then into the sample cavity 320, thereby realizing sampling of the fissile gas, and the second electromagnetic valve 360 and the gas inlet pipeline are used to introduce helium into the sample cavity 320, so that the pressure of the sample cavity 320 is consistent with the pressure when the calibration curve is established, thereby obtaining the sample gas. 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 the spectrum signal of the plasma is received by the light receiver 430 and gathered to the spectrometer 410 to generate spectrum information corresponding to the spectrum signal. According to the spectrum information and the calibration curve taking the sample gas as an internal standard element, the content of each component in the sample gas, i.e. the content of krypton and xenon in the sample gas, is determined, and then the content of krypton and xenon in the fissile gas is determined. 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 with a known preset volume, and the difference between the first volume and the second volume is taken as the volume of the element gas cavity. Based on the volume of the element gas cavity and the product of the content of krypton and xenon in the fissile gas, the total content of krypton and xenon is obtained. This process can complete the measurement of the fissile gas without introducing the fissile gas outside the hot cell 100, thereby improving the safety of the measurement process.

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

[0112] In addition, the embodiment of the present application also provides a fissile gas measurement method, which is applied to a fissile gas measurement device. The measurement device comprises a fuel element 200, a sample collection device 300 and a spectrum measurement device. The fuel element 200 is located inside a hot cell 100, the sample collection device 300 is located inside the hot cell 100, the sample collection device 300 is arranged adjacent to the fuel element 200, the spectrum measurement 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 cell 100, the light receiver 430 is arranged inside the hot cell 100, and the light receiver 430 is connected with the spectrometer 410. Referring to Figure 2 The fissile gas measurement method provided by the embodiment of the present application comprises but is not limited to the following steps:

[0113] Step S100, controlling the sample collection device to collect sample gas from the sample gas and the fissile gas of the fuel element.

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

[0115] Step S300, receiving the spectrum signal of the plasma by the light receiver and converging to the spectrometer to generate spectrum information corresponding to the spectrum signal.

[0116] Step S400, determining the content of each component in the fissile gas based on the spectrum information and the calibration curve taking the sample gas as an internal standard element.

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

[0118] It should be noted that the fissile gas measurement device comprises a fuel element 200, a sample collection device 300 and a spectrum measurement device. The nuclides such as 235U in the nuclear fuel produce fissile gas in the process of fission, most of which is stored in the irradiated fuel element 200 pellet, and a small part is released to the gap between the pellet and the cladding. The sample collection device 300 refers to a device for collecting sample gas from the sample gas and the fissile gas of the fuel element 200. The sample collection device 300 in the embodiment of the present application is located inside the hot cell 100, and the collection of sample gas can be completed only inside the hot cell 100.

[0119] The spectrum measuring device is used for measuring and analyzing the spectrum of the sample gas. Through the measurement and analysis result of the sample gas, the analysis of the fissile gas can be further completed. The spectrum measuring device specifically comprises a spectrometer 410, a laser 420 and a light receiver 430, wherein the spectrometer 410 and the laser 420 are arranged outside the hot cell 100, and the light receiver 430 is arranged inside the hot cell 100.

[0120] It should be noted that the laser 420 can emit laser to the sample collection device 300, so as to control the sample gas in the sample collection device 300 to ionize and generate plasma. In addition, the laser 420 and the sample collection device 300 are arranged on both sides of the observation window of the hot cell 100 respectively, so that the laser emitted by the laser 420 can pass through the observation window to the sample collection device 300. In addition, the material of the sample collection device 300 needs to be quartz glass, which can facilitate the laser to pass through on the basis of preventing radiation damage, so as to ensure that the laser 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 light receiver 430 can receive the spectrum signal of the plasma and converge to the spectrometer 410. The spectrometer 410 is an instrument for decomposing complex light into spectrum lines, which can decompose the spectrum signal received by the light receiver 430 into a plurality of spectrum lines, so as to determine the spectrum information of the plurality of spectrum lines. The spectrum information at least includes wavelength and signal strength, so that according to the wavelength of each spectrum line, the corresponding signal strength can be determined, so as to facilitate the analysis of the sample gas.

[0122] The light receiver 430 and the spectrometer 410 cooperate with each other to obtain the spectrum information contained in the spectrum signal corresponding to the sample gas. The light receiver 430 is located inside the hot cell 100, and the spectrometer 410 is located outside the hot cell 100. The light receiver 430 and the spectrometer 410 are connected through an optical fiber. Only the sample signal needs to be ionized inside the hot cell 100, so as to complete the reception of the spectrum signal. This process does not need to introduce the fissile gas or the sample gas out of the hot cell 100, which can reduce the risk of fissile gas leakage and the risk of radiation to the operator, and improve the safety of the measurement process.

[0123] Since the sample gas includes the sample gas in addition to the partial fission gas, the total content of the fission gas in the sample gas is determined according to 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%, and the content of krypton is 40%, so 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 one of the fission gas, and the sample gas cannot react with any component in the fission gas. Therefore, the embodiment of the present disclosure adopts helium (He) gas as the sample gas.

[0125] It should be noted that the spectrum measuring 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 cell 100 and is arranged adjacent to the sample collection device 300, and the spectrometer 410 and the laser 420 are located outside the hot cell 100. Therefore, when measuring the fission gas, only the laser 420 needs to be controlled to emit laser to the sample collection device 300 to excite the sample gas to generate plasma, and then the light spectrum signal of the plasma is received by the light receiver 430 and converged to the spectrometer 410 to generate the spectrum information corresponding to the light spectrum signal, so as to analyze the sample gas and further realize the measurement of the fission gas. The process can directly receive the spectrum signal inside the hot cell 100, without the need to introduce the fission gas outside the hot cell 100, thereby improving the safety of the fission gas measurement.

[0126] It can be understood that, with reference to Figure 1 The sample collection device 300 further includes a piercing cavity 310, a sample cavity 320, and a piercing device, the piercing cavity 310 is sleeved on one end of the fuel element 200, and the piercing cavity 310 communicates with the sample cavity 320. With reference to Figure 3 The step S100 includes but is not limited to the following steps:

[0127] The step S110 controls the piercing device to emit laser to the part of the fuel element located in the piercing cavity, so as to pierce the fuel element and further diffuse the fission gas to the sample cavity.

[0128] The step S120 introduces the sample gas into the sample cavity until the pressure value of the sample cavity reaches the specified pressure value of the calibration curve with the sample gas as the internal standard element, to obtain 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 piercing cavity 310 is sleeved on one end of the fuel element 200, and the piercing cavity 310 communicates with the sample cavity 320, and the piercing cavity 310 plays a role of communicating the sample cavity 320 and the element gas cavity of the fuel element 200. Then after the fuel element 200 is pierced by the piercer, the fission gas can diffuse to the sample cavity 320.

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

[0131] It should be noted that the gas inlet pipeline of the sample cavity 320 is connected with the second electromagnetic valve 360, and the sample gas can be introduced into the sample cavity 320 by controlling the second electromagnetic valve 360.

[0132] It can be understood that, with reference to Figure 4 Before step S100, the method provided by the embodiment of the application further includes:

[0133] Step S610, vacuumizing the sample cavity and the piercing cavity.

[0134] Step S620, inflating the vacuumized sample cavity to obtain a first pressure of the sample cavity.

[0135] Step S630, controlling the gas in the sample cavity to diffuse to the piercing cavity to obtain a second pressure of the sample cavity and the piercing cavity.

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

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

[0138] Step S650, vacuumizing the sample cavity and the piercing cavity again.

[0139] Step S660, inflating the vacuumized sample cavity again to obtain a third pressure of the sample cavity.

[0140] Step S670, controlling the gas in the sample cavity to diffuse to the piercing cavity to obtain a fourth pressure of the sample cavity and the piercing cavity.

[0141] Step S680, determining a second volume of the piercing cavity and the element gas 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 plenum volume of the fuel element.

[0143] It should be noted that the volume of the puncture cavity 310 can be determined before the fissile gas in the fuel element 200 diffuses into the puncture cavity 310. Specifically, first, the sample cavity 320 and the puncture cavity 310 are subjected to vacuumization. Then, the connecting channel between the sample cavity 320 and the puncture cavity 310 is closed, and a certain amount of gas is injected 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 connected to allow the certain amount of gas in the sample cavity 320 to diffuse into the puncture cavity 310, and the second pressure of the sample cavity 320 and the puncture cavity 310 is determined. Since the certain amount of 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 volume of the sample cavity 320 and the puncture cavity 310. Therefore, 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 the content of each component in the sample cavity 320, i.e., the fissile gas in the fuel element 200, diffuses into the puncture cavity 310, the second volume of the puncture cavity 310 and the element plenum can be determined. The second volume can be regarded as the sum of the volume of the puncture cavity 310 and the element plenum of the fuel element 200. Then, the difference between the second volume and the first volume is taken as the volume of the element plenum of the fuel element 200.

[0144] It should be noted that the present application embodiment is provided with the first electromagnetic valve 350 and the second electromagnetic valve 360. One end of the first electromagnetic valve 350 is connected with the sample cavity 320, and the other end of the first electromagnetic valve 350 is connected with the puncture cavity 310. The second electromagnetic valve 360 is connected with the gas inlet pipeline of the sample cavity 320, and is used to control the input of the sample gas into the sample cavity 320. The present application embodiment controls the communication between the sample cavity 320 and the puncture cavity 310 through the first electromagnetic valve 350, and controls the inflation of the sample cavity 320 and the vacuumization of the sample cavity 320 and the puncture cavity 310 through the second electromagnetic valve 360.

[0145] It should be noted that, in order to ensure the safety of the fissile gas measurement process, the gas used to inflate the sample cavity 320 cannot be any of the fissile gases, and the sample gas cannot react with any of the components in the fissile gas. Therefore, the present application embodiment inflates the sample cavity 320 with helium (He) gas.

[0146] It should be understood that, with reference to the foregoing description of the first embodiment, the second embodiment of the present application is similar to the first embodiment, and the differences between the two embodiments are as follows. Figure 5Before step S100, the method provided by the embodiment of the present application further comprises:

[0147] Step S710, before controlling the laser puncture device to emit laser to the part of the fuel element located in the puncture cavity, a calibration gas is introduced into the sample chamber, the calibration gas comprising a known amount of sample gas and each component of the fission gas.

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

[0149] Step S730, receiving the sample spectrum signal of the plasma by the light receiver and converging 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 taking the sample gas as an internal standard element is formulated.

[0151] It should be noted that the amount of the sample gas and each component of the fission gas in the calibration gas is known. The main components of the fission gas are krypton (Kr) and xenon (Xe), and during the measurement of the fission gas, krypton and xenon are mainly measured and analyzed, so the calibration curve is formulated using the calibration gas containing a known amount of krypton, xenon and sample gas.

[0152] It should be noted that during the formulation of 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 the multiple sets of calibration gas during the measurement and analysis are the same.

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

[0154] In addition, the calibration curve takes the sample gas as an internal standard element. Specifically, the embodiment of the present application can obtain multiple sets of sample spectrum information by multiple sets of calibration gas comprising different amounts of fission gas. A coordinate axis is established with the amount as the horizontal axis and the ratio of the signal intensity of each component in the fission gas to helium as the vertical axis, a plurality of coordinate points are determined on the coordinate axis based on the multiple sets of sample spectrum information, and the plurality of coordinate points are fitted to obtain the calibration curve. The calibration curve corresponding to krypton can be expressed as I Kr / I He =a1x1+b1, wherein I Kr is the signal intensity of krypton, which can be determined according to the signal intensity of the corresponding spectrum line on the spectrometer 410 at the wavelength 811.23 nanometers of krypton, I HeThe signal intensity of the sample gas helium corresponds to the wavelength of 706.519 nm, x1 is the content of krypton, which is expressed in the form of percentage, and a1 and b1 are constants determined according to a plurality of calibration gases with known contents. The calibration curve corresponding to xenon can be expressed as I Xe / I He = a2x2+b2, wherein I Xe is the signal intensity of xenon, which can be determined according to the signal intensity of the corresponding spectrum line at the wavelength of 823.16 nm of krypton on the spectrometer 410, x2 is the content of xenon, which is expressed in the form of percentage, and a2 and b2 are constants determined according to a plurality of calibration gases with different known contents.

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

[0156] It can be understood that, with reference to Figure 6 , the step S500 includes but is not limited to the following steps:

[0157] The step S510 includes determining the first signal intensity of the sample gas in the spectral information based on the first wavelength of the sample gas.

[0158] The step S520 includes determining the second signal intensity of each component in the fission gas in the spectral information based on the second wavelength of each component in the fission gas.

[0159] The step S530 includes finding the content of each component in the fission gas on the calibration curve with the sample gas as the internal standard element according to the ratio of the second signal intensity to the first signal intensity 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 spectral information includes wavelength and signal intensity, and therefore the first signal intensity of the sample gas can be determined by searching in the spectral 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, i.e., krypton and xenon, in the fission gas, and therefore the second signal intensity of krypton and xenon can be determined in the spectral information.

[0162] Since the calibration curve corresponding to krypton is expressed as I Kr / I He =a1x1+b1, and 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, and helium, the content of krypton and xenon in the sample gas can be determined, 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%, and the content of krypton is 40%, so 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 fissile gas measuring device in the embodiment of the present application comprises the fuel element 200, the sample collection device 300, and the spectrum measuring device, wherein the sample collection device 300 comprises the puncture cavity 310, the sample cavity 320 and the puncture device, and the spectrum measuring device comprises the spectrometer 410, the laser 420 and the light receiver 430. All the devices in the fuel element 200 and the sample collection device 300 are located inside the hot cell 100, and the light receiver 430 in the spectrum measuring device is located inside the hot cell 100, and the spectrometer 410 and the laser 420 and the control device 500 are located outside the hot cell 100. In the fissile gas measuring process, first, the calibration curve is established by the sample cavity 320 and the spectrum measuring device, the calibration curve takes helium as the internal standard element, the calibration gas is introduced into the sample cavity, and the laser 420 is controlled to send laser to the sample cavity to ionize the laser calibration gas to generate plasma, the sample spectrum signal of the plasma is received by the light receiver 430 and is converged to the spectrometer 410 to generate the sample spectrum information corresponding to the sample spectrum signal. Since the calibration gas comprises the components (such as krypton and xenon) in the fissile gas with known content and the sample gas, and the sample spectrum information comprises the wavelength and signal strength of krypton, xenon and helium, the calibration curve taking the sample gas as the internal standard element can be established according to the sample spectrum information. Then, the first volume of the puncture cavity 310 is measured. Then, the puncture device located above the fuel element 200 is controlled to puncture the fuel element 200 to release the fissile gas in the element gas cavity to the puncture cavity 310, and then to the sample cavity 320, so as to realize the sampling of the fissile gas, and the helium gas is introduced into the sample cavity 320 through the gas inlet pipeline of the sample cavity to make the pressure of the sample cavity 320 consistent with the pressure when the calibration curve is established, so as to obtain the sample gas. 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 the spectrum signal of the plasma is received by the light receiver 430 and is converged to the spectrometer 410 to generate the spectrum information corresponding to the spectrum signal. According to the spectrum information and the calibration curve taking the sample gas as the internal standard element, the content of each component in the sample gas, i.e. the content of krypton and xenon in the sample gas, is determined, and then the content of krypton and xenon in the fissile gas is determined. At this time, the second volume of the puncture cavity 310 is measured, and the difference between the second volume and the first volume is taken as the volume of the element gas cavity. Based on the volume of the element gas cavity and the product of the content of krypton and xenon in the fissile gas, the total content of krypton and xenon is obtained. The fissile gas measuring process can be completed without introducing the fissile gas out of the hot cell 100, thereby improving the safety of the measuring process.

[0164] The embodiment of the present application also provides an electronic device comprising a memory, a processor and a computer program stored in the memory and capable of running on the processor, and the processor executes the computer program as the fissile gas measuring method in steps S100 to S500.

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

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

[0167] The non-transitory software programs and instructions required to implement the measurement method of the fissile gas in the above embodiments are stored in the memory, and when executed by the processor, the measurement method of the fissile gas in the above embodiments is executed, for example, the method steps S100 to S500 in the above description Figure 2 are executed.

[0168] The device embodiments described above are only schematic, and the units described as separate components can or can not be physically separated, i.e., can be located in one place, or can be distributed on multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the present embodiment scheme.

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

[0170] As will be appreciated by one of ordinary skill in the art, all or some steps, systems of the above-disclosed methods can be implemented as software, firmware, hardware, or suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on computer readable media, which can comprise computer storage media (or non-transitory media), and communication media (or transitory media). As is well known to those of ordinary skill in the art, computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Further, as is well known to those of ordinary skill in the art, 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 includes any information delivery media.

[0171] The above detailed description of the application has been given by way of example, and the application is not limited to the examples described above but can be varied in many ways within the scope of the application. Furthermore, the features of the embodiments of the application and the features of the embodiments can be combined with each other, provided that there is no conflict.

Claims

1. A fissile gas measuring device, characterized by, include: Fuel elements are located inside the heat chamber; A sample collection device is located inside the hot chamber and is disposed 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. A spectral measurement device includes a spectrometer, a laser, and a receiver. The spectrometer and the laser are located outside the hot chamber, and the receiver is located inside the hot chamber. The receiver is connected to the spectrometer and is used to collect spectral signals. A control device is used to control the laser to send laser light to the sample acquisition device to excite the sample gas to generate plasma; to receive the spectral signal of the plasma through the receiver and to converge it to the spectrometer to generate spectral information corresponding to the spectral signal; and to determine the content of each component in the fission gas based on the spectral information and a calibration curve with the sample gas as an internal standard element, thereby determining the total amount of each component in the fission gas.

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

3. The measuring device of claim 2, wherein, The sample collection device also includes: A first solenoid valve, one end of which is connected to the sample chamber, and the other end of which is connected to the puncture chamber; The second solenoid valve is connected to the air inlet pipe of the sample chamber and is used to control the input of the sample gas into the sample chamber.

4. The measuring device of claim 2, wherein, The sample collection device also includes a piercing device, which is disposed above the piercing cavity and located above the fuel element.

5. A method of measuring a fissile gas, characterized by, A measuring device for fissile gases, comprising a fuel element, a sample acquisition device, and a spectroscopic measuring device, wherein the fuel element is located inside a hot chamber, the sample acquisition device is located inside the hot chamber and is arranged adjacent to the fuel element, and the spectroscopic measuring device comprises a spectrometer, a laser, and a detector, wherein the spectrometer and the laser are located outside the hot chamber, the detector is located inside the hot chamber and is connected to the spectrometer, and the measuring method includes: The sample collection device is controlled to collect sample gas from the sample gas and the fission gas of the fuel element; The laser is controlled to send a laser beam to the sample acquisition device to excite the sample gas to generate plasma; The optical receiver receives the spectral signal of the plasma and focuses it onto the spectrometer to generate spectral information corresponding to the spectral signal. Based on the spectral information and the calibration curve using the sample gas as an internal standard element, the content of each component in the fission gas is determined; The product of the content of each component in the fissile gas and the volume of the element gas cavity of the fuel element is taken as the total amount of each component in the fissile gas.

6. The measurement method according to claim 5, characterized in that, The sample collection device further comprises a puncture cavity, a sample cavity and a puncture device, the puncture cavity is sleeved on one end of the fuel element, the puncture cavity is in communication with the sample cavity, and the control of the sample collection device for collecting sample gas from sample gas and fissile gas of the fuel element comprises: controlling the puncture device to emit laser to the part of the fuel element located in the puncture cavity to puncture the fuel element, so that the fissile gas diffuses to the sample cavity; The sample gas is introduced into the sample chamber until the pressure value of the sample cavity reaches the specified pressure value of the calibration curve with the sample gas as the internal standard element, and the sample gas is obtained.

7. The measurement method according to claim 6, characterized in that, Before the control of the sample collection device for collecting sample gas from sample gas and fissile gas of the fuel element, the method further comprises: vacuumizing the sample cavity and the puncture cavity; inflating the sample cavity after vacuumizing to obtain the first pressure of the sample cavity; controlling the gas in the sample cavity to diffuse to the puncture cavity to obtain the second pressure of the sample cavity and the puncture cavity; determining the first volume of the puncture cavity based on the first pressure, the second pressure and the preset volume of the sample cavity; Before the product of the content of each component in the fissile gas and the volume of the element gas cavity of the fuel element is taken as the total amount of each component in the fissile gas, the method further comprises: secondary vacuumizing the sample cavity and the puncture cavity; inflating the sample cavity after secondary vacuumizing to obtain the third pressure of the sample cavity; controlling the gas in the sample cavity to diffuse to the puncture cavity to obtain the fourth pressure of the sample cavity and the puncture cavity; determining the second volume of the puncture cavity and the element 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 volume of the element gas cavity of the fuel element.

8. The measurement method according to claim 6, characterized by, Before the control of the sample collection device for collecting sample gas from sample gas and fissile gas of the fuel element, the method further comprises: introducing calibration gas into the sample chamber, the calibration gas comprising known content of the sample gas and each component of the fissile gas; controlling the laser to send laser to the sample cavity to excite the calibration gas to generate sample plasma; receiving the sample spectrum signal of the plasma by the light receiver and converging to the spectrometer to generate sample spectrum information corresponding to the sample spectrum signal; based on the sample spectrum information, a calibration curve with the sample gas as the internal standard element is formulated.

9. The measurement method according to claim 8, characterized in that, The determination of the content of each component in the fissile gas based on the spectrum information and the calibration curve with the sample gas as the internal standard element comprises: determining a first signal intensity of the sample gas in the spectral information based on a first wavelength of the sample gas; determining a second signal intensity of each component in the fissile gas in the spectral information based on a second wavelength of each component in the fissile gas; finding the content of each component in the fissile gas on a calibration curve with the sample gas as an internal standard element according to the ratio of the second signal intensity of each component in the fissile gas to the first signal intensity.

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

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