CN113030126A - MOX pellet uniformity detection method - Google Patents
MOX pellet uniformity detection method Download PDFInfo
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- CN113030126A CN113030126A CN201911343031.6A CN201911343031A CN113030126A CN 113030126 A CN113030126 A CN 113030126A CN 201911343031 A CN201911343031 A CN 201911343031A CN 113030126 A CN113030126 A CN 113030126A
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- mox
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- pixel brightness
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- 239000008188 pellet Substances 0.000 title claims abstract description 49
- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000003384 imaging method Methods 0.000 claims abstract description 19
- 238000002474 experimental method Methods 0.000 claims description 9
- 238000005202 decontamination Methods 0.000 claims description 3
- 230000003588 decontaminative effect Effects 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 abstract description 6
- 239000000446 fuel Substances 0.000 description 5
- 238000012512 characterization method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011195 cermet Substances 0.000 description 1
- 238000003869 coulometry Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000000105 evaporative light scattering detection Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000001205 potentiostatic coulometry Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002915 spent fuel radioactive waste Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The MOX pellet uniformity detection method is characterized in that an MOX pellet is placed on an IP plate for irradiation imaging, and the uniformity of the MOX pellet is represented by an image and a pixel brightness value, so that the successful preparation and the stacking safety operation of the MOX pellet are guaranteed. The method is convenient to operate and can be suitable for large-batch detection of MOX pellets; compared with the traditional photographic method, the imaging is clearer, the uniformity of the MOX core blocks can be judged by using the pixel brightness of the image, and the method has important significance for representing the microscopic uniformity of the MOX core blocks.
Description
Technical Field
The invention relates to the field of nuclear-grade cermet body detection, in particular to a detection method for MOX pellet uniformity detection.
Background
The MOX fuel preparation technology is a core technology of fast reactor commercial application, is one of the restriction factors of fast reactor development and application, and the research and development of MOX fuel are highly emphasized in the fast reactor development process of all countries in the world. China needs to realize the commercial application of fast reactor, and the autonomous research and release of MOX fuel should be in a prominent position.
The uniformity of the MOX pellets is one of the core technical indexes for pellet preparation and release and is also one of the key factors for safe operation of the stacking. If the MOX pellet components are not uniformly distributed, the following disadvantages may occur: firstly, MOX fuel generates a local power peak value in the in-reactor service process to damage the safety of a reactor; secondly, the MOX spent fuel may have poor solubility during the post-treatment process; third, the MOX fuel pellets can develop microcracks at the interface during sintering. Therefore, the characterization method of the uniformity of the MOX pellets is one of the keys to the preparation of qualified MOX pellets.
At present, the domestic uniformity measurement of MOX pellets can be realized by a controlled potential coulometry method. However, the coulometry method requires a long time (about 2-3 days), requires crushing and grinding treatment on the pellets, has high dissolution difficulty, and has limitation on the large-scale detection of the MOX pellets. Meanwhile, the uniformity of representing the MOX pellets by using an energy spectrometer has high accuracy, but the sample preparation is complicated, the detection time is short, and the detection method has limitations because the equipment is easy to damage under a radioactive environment.
The uniformity of the pellets can be indicated by using a photographic method, as known in connection with the conventional pressurized water reactor pellet uniformity indicator method. The method uses a core block as a 'light source', the core block is placed on a film and is transferred into a darkroom for irradiation, and the uniformity is judged according to the exposure degree (black and white degree) of the film; the method has long operation time and low identification precision, and is not beneficial to the characterization of uniformity. Therefore, on the basis of the traditional photographic method, a computer-ray technology (CR technology for short) is introduced into the uniformity detection of the MOX pellet, an imaging plate (IP plate for short) with higher identification precision is used for replacing the traditional film, the image information on the irradiated IP plate is read through a special reader and is transmitted to a computer for image processing by using special software; therefore, a clearer image (which can be processed into a color image) can be obtained, and the pixel brightness value of the image can be counted. Because the radioactivity of different components in the MOX core block is different, the imaging effect on the IP plate is different after irradiation; the distribution conditions of different components in the MOX core blocks can be directly represented through images, and the uniformity of the MOX core blocks can be judged in an auxiliary mode through counting the pixel brightness values of the images.
Disclosure of Invention
The invention aims to: the MOX pellet uniformity detection method is characterized in that an MOX pellet is placed on an IP plate for irradiation imaging, and the uniformity of the MOX pellet is represented by an image and a pixel brightness value, so that the successful preparation and the stacking safety operation of the MOX pellet are guaranteed.
The technical scheme of the invention is as follows: a detection method for MOX pellet uniformity detection comprises the following steps:
the method comprises the following steps: selecting 1 standard MOX pellet and 2 MOX pellets prepared by experiments;
step two: placing 3 MOX pellets on the packaged imaging plate;
step three: numbering the 3 MOX core blocks, and recording the placing positions of the MOX core blocks with different serial numbers;
step four: irradiating 3 MOX pellets;
step five: after irradiation is finished, 3 MOX pellets are placed at a specified position, and the imaging plate is taken out;
step six: putting the imaging plate into a reader, and reading image information;
step seven: deducting the background of the image, and adjusting the contrast, brightness and color saturation to obtain a clear image; counting the pixel brightness values of different areas, and taking the pixel brightness value of the standard MOX core block in the step one as a standard value;
step eight: and comparing the pixel brightness value of the MOX core block prepared by the experiment with a standard value, and if the difference between the pixel brightness value and the standard value is less than 15%, judging that the components of the MOX core block prepared by the experiment are uniform.
In the fourth step, 3 MOX pellets were irradiated for 10 minutes.
And in the fifth step, if the imaging plate is stained, decontamination treatment is required.
The invention has the following remarkable effects: the method is convenient to operate and can be suitable for large-batch detection of MOX pellets; compared with the traditional photographic method, the imaging is clearer, the uniformity of the MOX core blocks can be judged by using the pixel brightness of the image, and the method has important significance for representing the microscopic uniformity of the MOX core blocks.
The method is simple to operate, is suitable for mass detection of MOX pellets, and reduces the exposure of personnel.
Detailed Description
A detection method for MOX pellet uniformity detection comprises the following steps:
the method comprises the following steps: selecting 1 standard MOX pellet and 2 MOX pellets prepared by experiments;
step two: placing 3 MOX pellets on the packaged imaging plate;
step three: numbering the 3 MOX core blocks, placing the 3 MOX core blocks on an imaging plate, and recording the placing positions of the MOX core blocks with different serial numbers;
step four: irradiating 3 MOX pellets for 10 minutes;
step five: after irradiation, 3 MOX pellets are placed in a designated position, and the imaging plate is taken out (if the imaging plate is stained, decontamination treatment is needed);
step six: putting the imaging plate into a reader, and reading image information;
step seven: deducting the background of the image, and adjusting the contrast, brightness and color saturation to obtain a clear image; and (4) counting the pixel brightness values of different areas, and taking the pixel brightness value of the standard MOX core block in the step one as a standard value.
Step eight: and comparing the pixel brightness value of the MOX core block prepared by the experiment with a standard value, and if the difference between the pixel brightness value and the standard value is less than 15%, judging that the components of the MOX core block prepared by the experiment are uniform.
Claims (3)
1. A detection method for MOX pellet uniformity detection is characterized in that: the method comprises the following steps:
the method comprises the following steps: selecting 1 standard MOX pellet and 2 MOX pellets prepared by experiments;
step two: placing 3 MOX pellets on the packaged imaging plate;
step three: numbering the 3 MOX core blocks, and recording the placing positions of the MOX core blocks with different serial numbers;
step four: irradiating 3 MOX pellets;
step five: after irradiation is finished, 3 MOX pellets are placed at a specified position, and the imaging plate is taken out;
step six: putting the imaging plate into a reader, and reading image information;
step seven: deducting the background of the image, and adjusting the contrast, brightness and color saturation to obtain a clear image; counting the pixel brightness values of different areas, and taking the pixel brightness value of the standard MOX core block in the step one as a standard value;
step eight: and comparing the pixel brightness value of the MOX core block prepared by the experiment with a standard value, and if the difference between the pixel brightness value and the standard value is less than 15%, judging that the components of the MOX core block prepared by the experiment are uniform.
2. The method for detecting the uniformity of the MOX pellets according to claim 1, wherein the method comprises the following steps: in the fourth step, 3 MOX pellets were irradiated for 10 minutes.
3. The method for detecting the uniformity of the MOX pellets according to claim 1, wherein the method comprises the following steps: and in the fifth step, if the imaging plate is stained, decontamination treatment is required.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911343031.6A CN113030126A (en) | 2019-12-24 | 2019-12-24 | MOX pellet uniformity detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911343031.6A CN113030126A (en) | 2019-12-24 | 2019-12-24 | MOX pellet uniformity detection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113030126A true CN113030126A (en) | 2021-06-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911343031.6A Pending CN113030126A (en) | 2019-12-24 | 2019-12-24 | MOX pellet uniformity detection method |
Country Status (1)
| Country | Link |
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| CN (1) | CN113030126A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080144023A1 (en) * | 2006-11-07 | 2008-06-19 | Yukihiro Shibata | Apparatus for inspecting defects |
| JP2011209028A (en) * | 2010-03-29 | 2011-10-20 | Toshiba Corp | Apparatus and method for inspecting homogeneity of neutron poison |
| CN106770390A (en) * | 2016-12-29 | 2017-05-31 | 中核北方核燃料元件有限公司 | Three layers of sandwich structure fuel element neutron ray detection method |
| CN107464592A (en) * | 2017-08-29 | 2017-12-12 | 中核四0四有限公司 | MOX pellets uniformity is from number of rays values determination method |
| CN207610961U (en) * | 2017-10-30 | 2018-07-13 | 中核四0四有限公司 | A kind of MOX granulated pellets analysis of Uniformity device |
| CN109727696A (en) * | 2017-10-30 | 2019-05-07 | 中核四0四有限公司 | MOX pellet recycling and reusing method |
| CN109990706A (en) * | 2019-03-28 | 2019-07-09 | 中国核电工程有限公司 | The on-line measuring device and method of fuel pellet apparent size |
-
2019
- 2019-12-24 CN CN201911343031.6A patent/CN113030126A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080144023A1 (en) * | 2006-11-07 | 2008-06-19 | Yukihiro Shibata | Apparatus for inspecting defects |
| JP2011209028A (en) * | 2010-03-29 | 2011-10-20 | Toshiba Corp | Apparatus and method for inspecting homogeneity of neutron poison |
| CN106770390A (en) * | 2016-12-29 | 2017-05-31 | 中核北方核燃料元件有限公司 | Three layers of sandwich structure fuel element neutron ray detection method |
| CN107464592A (en) * | 2017-08-29 | 2017-12-12 | 中核四0四有限公司 | MOX pellets uniformity is from number of rays values determination method |
| CN207610961U (en) * | 2017-10-30 | 2018-07-13 | 中核四0四有限公司 | A kind of MOX granulated pellets analysis of Uniformity device |
| CN109727696A (en) * | 2017-10-30 | 2019-05-07 | 中核四0四有限公司 | MOX pellet recycling and reusing method |
| CN109990706A (en) * | 2019-03-28 | 2019-07-09 | 中国核电工程有限公司 | The on-line measuring device and method of fuel pellet apparent size |
Non-Patent Citations (1)
| Title |
|---|
| 夏纪真: "《工业无损检测技术》", 中山大学出版社 * |
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Application publication date: 20210625 |
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