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CN-121977995-A - Nuclear fuel cladding tube ion irradiation experimental device and method

CN121977995ACN 121977995 ACN121977995 ACN 121977995ACN-121977995-A

Abstract

The invention provides an ion irradiation experimental device and method for a nuclear fuel cladding tube. The environment simulation container is used for providing a preset vacuum environment and a preset temperature environment for ion irradiation experiments of tubular samples. The sample rotating mechanism comprises a sample loading device, a magnetic rotating shaft and a rotating driving device, wherein the sample loading device is rotatably arranged in the environment simulation container, the rotating driving device is arranged outside the environment simulation device and drives the sample loading device to rotate through the magnetic rotating shaft, and the sealing performance of the environment simulation container can be ensured by using the magnetic rotating shaft. The ion beam supply window is for emitting an ion beam toward the tubular sample. During the experiment, when ion beam is to tubular sample, rotary driving device drives tubular sample through magnetic force pivot rotation, makes it can form even irradiation damage distribution in tubular sample's whole circumference surface.

Inventors

  • ZHANG TONGMIN
  • ZHANG LIMIN
  • LI JUN
  • Wei haiyuan
  • LI JINYU

Assignees

  • 兰州大学
  • 中国科学院近代物理研究所

Dates

Publication Date
20260505
Application Date
20260121

Claims (10)

  1. 1. An experimental device for nuclear fuel cladding tube ion irradiation, comprising: the environment simulation container is used for providing a preset vacuum environment and a preset temperature environment for the tubular sample (100), and an ion beam input interface is arranged on the environment simulation container; The sample rotating mechanism comprises a sample loading device, a magnetic rotating shaft (220) and a rotating driving device, wherein the sample loading device is rotatably arranged in the environment simulation container, the rotating driving device is arranged outside the environment simulation container, and the rotating driving device is in transmission connection with the sample loading device through the magnetic rotating shaft (220); an ion beam supply window, an ion beam outlet of the ion beam supply window being connected to the ion beam input interface, and an emission direction of an ion beam being aligned with the tubular sample (100) within the environmental simulation vessel.
  2. 2. The nuclear fuel cladding tube ion irradiation experiment device according to claim 1, wherein the environment simulation container comprises a closed cavity, a heating assembly arranged in the closed cavity and a vacuumizing assembly connected to the outside of the closed container.
  3. 3. The nuclear fuel cladding tube ion irradiation experiment device according to claim 2, wherein the closed cavity is provided with an energizing interface and a temperature measuring interface, and the heating assembly comprises: the heating wire (420) is bent back and forth along the axial direction and extends along the circumferential direction to form a cylindrical heating surface surrounding the tubular sample, and two ends of the heating wire (420) are electrically connected with an external power supply through the power-on interface; the armored thermocouple (430) is connected with the temperature measuring interface in a sealing way, and the detection end of the armored thermocouple (430) enters the airtight cavity through the temperature measuring interface and extends to the side wall of the tubular sample (100); and the temperature control unit is used for receiving a preset temperature value and controlling the heating temperature of the heating wire (420) based on real-time temperature data acquired by the armored thermocouple (430).
  4. 4. A nuclear fuel cladding tube ion irradiation experimental device according to claim 3, wherein an insulating layer (500) is further arranged between the outer side of the area surrounded by the heating wire (420) and the inner side wall of the closed cavity, and an ion channel which is communicated between the outer side wall of the tubular sample and the ion beam input interface is arranged on the insulating layer (500).
  5. 5. The nuclear fuel cladding tube ion irradiation experiment device according to claim 2, wherein the closed cavity is further provided with a vacuum interface (610) and a vacuum degree detection interface which are communicated with the inner side and the outer side of the closed cavity, and the vacuumizing assembly comprises: a vacuum pump set, the vacuum extraction end of the vacuum pump set is connected with the vacuum interface (610); the ionization vacuum gauge (620), the ionization vacuum gauge (620) is connected with the vacuum degree detection interface in a sealing way, and the detection end of the ionization vacuum gauge (620) stretches into the inner part of the closed cavity; And the vacuum control unit is used for receiving a preset vacuum degree value and controlling the operation power of the vacuum pump set based on real-time vacuum degree data acquired by the ionization vacuum gauge (620).
  6. 6. The nuclear fuel cladding tube ion irradiation experiment device according to claim 2, wherein the outside of the closed cavity is further provided with a circulating water cooling device (700).
  7. 7. The nuclear fuel cladding tube ion irradiation experiment device according to claim 2, wherein the closed cavity is further provided with a shielding gas input interface (800) communicated with the inner side and the outer side of the closed cavity.
  8. 8. The nuclear fuel cladding tube ion irradiation experiment device according to claim 2, wherein a gas release valve (900) is further arranged on the closed cavity and communicated with the inner side and the outer side of the closed cavity.
  9. 9. A nuclear fuel cladding ion irradiation experimental method, characterized in that the method is realized based on the nuclear fuel cladding ion irradiation device according to any one of claims 1-8, and comprises the following steps: adjusting front-end accelerator parameters to enable an ion beam required by an experiment to reach a stable state, wherein the ion beam parameters at least comprise ion beam energy E, ion element A and ion valence state X; Mounting a PET film on a sample loading device, carrying out ion irradiation on the PET film for 30-60S under a vacuum environment provided by an environment simulation container, taking out the PET film, recording the intensity I of an ion beam, and measuring the irradiation trace area S of the ion beam; Installing a tubular sample (100) on the sample loading device, and carrying out ion irradiation delta t on the tubular sample (100) under the vacuum environment and the temperature environment provided by the environment simulation container, wherein the tubular sample (100) is driven to rotate at a constant speed by a rotary driving device through a magnetic rotating shaft (220) and the sample loading device while carrying out ion irradiation, and the rotating speed is n; Calculating the average ion irradiation fluence generated on the surface of the tubular sample (100) after ion irradiation experiments using the following formula : ; Calculating the average ion irradiation fluence rate phi generated on the surface of the tubular sample (100) after ion irradiation experiments using the following formula: ; Wherein the ion beam energy E is in keV, the ion beam spot area S is in cm2, the ion beam intensity I is in μA, the outer diameter D of the tubular sample (100) and the height h of the tubular sample (100) are in cm, the temperature T is in DEG C, the rotational speed n of the tubular sample (100) is in r/min, the irradiation duration Δt is in S, the average ion irradiation fluence is in The unit of the average ion irradiation fluence rate phi is ions/cm 2 , and the unit of the average ion irradiation fluence rate phi is ions/cm 2 s.
  10. 10. The nuclear fuel cladding ion irradiation experimental method according to claim 9, wherein the tubular sample (100) has an outer diameter D and a height h, wherein D is equal to or greater than 0.8cm and D is equal to or less than 1.8cm, h is equal to or greater than 0.5cm and h is equal to or less than 2.0cm.

Description

Nuclear fuel cladding tube ion irradiation experimental device and method Technical Field The invention relates to the technical field of nuclear material testing and nuclear energy safety, in particular to an ion irradiation experimental device and method for a nuclear fuel cladding tube. Background Nuclear power is an important component of the energy strategy in China, and the safe and efficient development of the nuclear power depends on the long-term service reliability of key component materials. The fuel cladding is used as a first safety barrier of the pressurized water reactor nuclear power station, and is subjected to the coupling action of multiple severe environments such as high temperature, high pressure, corrosion, neutron irradiation and the like in the service process, so that the degradation of material performance and the reduction of structural integrity are easily caused, and the operation safety and the service life are directly influenced. In order to study the influence of irradiation on the material performance, especially the irradiation accelerated corrosion mechanism, an ion irradiation experiment is generally adopted to simulate the actual neutron irradiation environment, and the method has the advantages of low cost, high efficiency, small radioactivity risk and the like. Currently, conventional ion irradiation experiments are mainly directed to planar sheet samples. The standard operation is to mount the sample on the sample target by fixing connection means such as sticking, after one surface is irradiated, the sample is turned over and then is fixed again, and then the other surface is irradiated. However, the actual fuel cladding is a cylindrical member, the fixing and irradiation mode for the planar sample is still directly adopted in the prior art, the cylindrical sample is fixed on the sample target in a specific direction, the ion beam can only irradiate one side of the cylindrical sample, even if the front and back sides of the cylindrical sample are irradiated, namely, one side is irradiated firstly, the opposite side is irradiated after the front and back sides are turned over, the discrete and limited-angle irradiation mode cannot form uniform irradiation damage distribution on the whole circumferential surface of the circular tube sample, and the method is seriously different from the actual service condition of uniform irradiation of neutrons in the reactor from the whole circumference. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides an experimental device for ion irradiation of a cladding tube and a method for calculating the ion irradiation fluence rate, and aims to solve the problem that in the related art, the whole circumferential surface of a tubular sample can not form uniform irradiation damage distribution any more due to the fact that a fixed target is used for fixing the tubular sample for ion irradiation. The invention provides an ion irradiation experimental device for a nuclear fuel cladding tube, which comprises the following components: the environment simulation container is used for providing a preset vacuum environment and a preset temperature environment for the tubular sample, and an ion beam input interface is arranged on the environment simulation container; the sample rotating mechanism comprises a sample loading device, a magnetic rotating shaft and a rotating driving device, wherein the sample loading device is rotatably arranged in the environment simulation container, the rotating driving device is arranged outside the environment simulation container, and the rotating driving device is in transmission connection with the sample loading device through the magnetic rotating shaft; An ion beam supply window having an ion beam outlet connected to the ion beam input interface and having an ion beam emission direction aligned with the tubular sample within the environmental simulation vessel. According to the nuclear fuel cladding tube ion irradiation experimental device provided by the invention, the environment simulation container comprises a closed cavity, a heating component arranged in the closed cavity and a vacuumizing component connected to the outside of the closed container. According to the nuclear fuel cladding tube ion irradiation experimental device provided by the invention, the closed cavity is provided with an electrifying interface and a temperature measuring interface, and the heating assembly comprises: The heating wire is bent back and forth along the axial direction and extends along the circumferential direction to form a cylindrical heating surface surrounding the tubular sample, and two ends of the heating wire are electrically connected with an external power supply through the power-on interface; The armored thermocouple is in sealing connection with the temperature measuring interface, and the detection