CN105161147B - A kind of presurized water reactor spent fuel element three-dimensional neutron photography lossless detection method - Google Patents
A kind of presurized water reactor spent fuel element three-dimensional neutron photography lossless detection method Download PDFInfo
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- CN105161147B CN105161147B CN201510431792.2A CN201510431792A CN105161147B CN 105161147 B CN105161147 B CN 105161147B CN 201510431792 A CN201510431792 A CN 201510431792A CN 105161147 B CN105161147 B CN 105161147B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The present invention relates to a kind of nuclear material monitoring method.Available still without ripe three-dimensional neutron photography method in the field of non destructive testing of presurized water reactor spent fuel element to solve the problems, such as, the invention provides a kind of presurized water reactor spent fuel element three-dimensional neutron photography lossless detection method.This method comprises the following steps：First, neutron convert screen is placed to put；2nd, introduce neutron streaming and carry out two-dimensional imaging；3rd, spent fuel element is rotated a certain angle；4th, continuous repeat step two, three, until rotating to 180 degree, several two-dimensional imagings are obtained；5th, Data correction reference zone is chosen；6th, the detection information of two-dimensional imaging is obtained by digital imagery plate；7th, two-dimensional imaging detection information is corrected；8th, three-dimensional reconstruction is carried out after deducting details in a play not acted out on stage, but told through dialogues and light field；9th, Non-Destructive Testing is completed.The detection method of the present invention can obtain clearly presurized water reactor spent fuel element three-dimensional imaging, and powerful guarantee is provided for the quality testing and performance boost of China's presurized water reactor nuclear fuel element.
Description
Technical field
The present invention relates to a kind of nuclear material monitoring method, and in particular to a kind of presurized water reactor spent fuel element three-dimensional neutron photography
Lossless detection method.
Background technology
In nuclear industry field, to realize the quality control of presurized water reactor nuclear fuel element, it is necessary to corresponding spent fuel element
Detected.However, because presurized water reactor spent fuel element has hot, therefore in general detection technique can not be applied to it
Detection.
Neutron-radiography is widely used in industrial circle as a kind of advanced non-destructive testing technology, has detection speed
Many advantages, such as degree is fast, result is accurate, reliability is high.But the hot of presurized water reactor spent fuel element in itself can be shone neutron
Severe jamming is mutually produced, causes that detection imaging can not be obtained at all, therefore traditional neutron-radiography can not directly apply to
The detection of spent fuel element.
Therefore, current presurized water reactor spent fuel element neutron-radiography uses indirect imaging method, with neutron convert screen
Image-forming information is converted, so as to realize the qualitative detection of spent fuel element, spent fuel element pellet cracking, bag can be obtained
The defects of shell is damaged, involucrum hydrogen is poly- information.However, this method is only capable of completing at present the two-dimensional detection imaging of spent fuel element, because
This can not obtain the three-dimensional letter of the defects of spent fuel element pellet fragment pattern, the distribution of pellet internal particle, clad failure state
Breath.
Because the acquisition of drawbacks described above three-dimensional information is imaged dependent on the three-dimensional values of spent fuel element, but due at present still
Without maturation presurized water reactor spent fuel element three-dimensional neutron photography lossless detection method it is available, existing CT technologies also due to
Variety of problems and the three-dimensional values that can not be applied to spent fuel element completely are imaged, therefore to realize presurized water reactor spent fuel element
Three dimensional lossless detection, it is necessary to develop a kind of new three-dimensional neutron photography lossless detection method.
The content of the invention
To solve in the field of non destructive testing of presurized water reactor spent fuel element, still no ripe three-dimensional neutron photography method can
The problem of for using, the invention provides a kind of presurized water reactor spent fuel element three-dimensional neutron photography lossless detection method.
This method comprises the following steps：
(1) neutron convert screen is placed in spent fuel element rear to be detected；
(2) neutron streaming is introduced in front of spent fuel element, neutron streaming makes neutron convert screen after spent fuel element
Exposure, a width spent fuel element two-dimensional imaging is obtained, after exposing a period of time, remove neutron streaming；
(3) neutron convert screen is translated to change projection of the neutron streaming after spent fuel element on neutron convert screen
Position, or change a neutron convert screen；Keep the distance of spent fuel element and neutron convert screen constant simultaneously；Then along weary combustion
Material element axle center rotates a certain angle spent fuel element；
(4) continuous repeat step (two) and step (3), until rotating to 180 degree, several spent fuel elements two dimension is obtained
Imaging；Therebetween, the parameter and time for exposure all same of the neutron streaming introduced every time, the angle that spent fuel element rotates every time
Also it is identical；
(5) same position near each width spent fuel element two-dimensional imaging is chosen size identical exposure area and made
For the Data correction reference zone of the two-dimensional imaging；
(6) each width spent fuel element two-dimensional imaging of gained is transferred to digital imagery plate, Ran Houtong by neutron convert screen
Cross reading device to be scanned digital imaging plate, obtain the detection information of each width spent fuel element two-dimensional imaging；
(7) each width spent fuel element two-dimensional imaging is detected by contrasting the detection information of each Data correction reference zone
Information is corrected；
(8) details in a play not acted out on stage, but told through dialogues to each width spent fuel element two-dimensional imaging detection information after correction and light field are deducted, then
The three-dimensional reconstruction of spent fuel element imaging is carried out using CT reconstruction techniques, obtains the three-dimensional imaging of spent fuel element；
(9) Non-Destructive Testing of the analysis completion spent fuel element to three-dimensional imaging is passed through.
It is described that spent fuel element rotates a certain angle preferably 1 degree along spent fuel element axle center.
The neutron convert screen is preferably dysprosium screen.
Before three-dimensional reconstruction, each width spent fuel element two-dimensional imaging can be intercepted, only retain spent fuel element
Two-dimensional imaging region, to save the time of three-dimensional reconstruction and cost.
The presurized water reactor spent fuel element three-dimensional neutron photography lossless detection method of the present invention is by neutron convert screen by weary combustion
Several two-dimensional imagings in the range of material element 180 degree are transferred on digital imagery plate (i.e. IP plates), then using CT reconstruction techniques
The three-dimensional reconstruction of spent fuel element imaging is carried out, so as to realize the Non-Destructive Testing of spent fuel element.
In the gatherer process of spent fuel element two-dimensional imaging, because each width two-dimensional imaging exists successively on the time is obtained
Relation, therefore when two-dimensional imaging formation below, the intensity of the two-dimensional imaging obtained before is because neutron convert screen is lived
The horizontal decay of change and reduce, turn into the obstacle of three-dimensional reconstruction.Therefore, the present invention exposes by using near every width two-dimensional imaging
The mode that Data correction reference zone is chosen in light region is corrected to two-dimensional imaging intensity, so as to solve because neutron turns
The problem of changing the decay of screen activation levels and three-dimensional reconstruction can not be carried out.
In summary, presurized water reactor spent fuel element three-dimensional neutron photography lossless detection method of the invention overcome it is three-dimensional into
Difficulty as encountered in, solves the three-dimensional neutron photography for not having maturation in the field of non destructive testing of presurized water reactor spent fuel element
The problem of method is available.Practical application shows, the clearly weary combustion of presurized water reactor can be obtained using the detection method of the present invention
Expect element three-dimensional imaging, more accurate spent fuel element pellet fragment pattern, the distribution of pellet internal particle, involucrum can be obtained
The complete detection information of the defects of damaged state, the Non-Destructive Testing information content of presurized water reactor spent fuel element is greatly extended, is
The quality testing of China's presurized water reactor nuclear fuel element provides powerful guarantee with performance boost.
Brief description of the drawings
The neutron convert screen exposure image process schematic of Fig. 1 present invention.
Reference：1. neutron convert screen, 2. first width two-dimensional imagings, 3. first width two-dimensional imaging datas correction reference area
Domain, 4. the 5th width two-dimensional imagings, 5. the 5th width two-dimensional imaging datas correction reference zone.
Embodiment
Embodiments of the present invention are described further below in conjunction with the accompanying drawings.
Embodiment
Using the presurized water reactor spent fuel element three-dimensional neutron photography lossless detection method of the present invention to certain presurized water reactor nuclear fuel
Element carries out Non-Destructive Testing, and its step is as follows：
(1) neutron convert screen is placed in the spent fuel element rear；Spent fuel element length is 15cm；
(2) neutron streaming is introduced in front of spent fuel element, neutron streaming makes neutron convert screen after spent fuel element
Exposure, a width spent fuel element two-dimensional imaging is obtained, after exposing a period of time, remove neutron streaming；Neutron convert screen size is
20cm×20cm×0.01cm；
(3) neutron convert screen is translated to change projection of the neutron streaming after spent fuel element on neutron convert screen
Position, according to selected neutron convert screen size, every neutron convert screen can obtain 5 width spent fuel element two-dimensional imagings
(as shown in Figure 1) neutron convert screen, is then changed；Keep the distance of spent fuel element and neutron convert screen constant simultaneously；
Then spent fuel element is rotated 1 degree along spent fuel element axle center；
(4) continuous repeat step (two) and step (3), until rotating to 180 degree, obtain 180 width spent fuel elements two
Dimension imaging；Therebetween, the parameter and time for exposure all same of the neutron streaming introduced every time；
(5) same position near each width spent fuel element two-dimensional imaging is chosen size identical exposure area and made
For the Data correction reference zone of the two-dimensional imaging；
(6) each width spent fuel element two-dimensional imaging of gained is transferred to digital imagery plate, Ran Houtong by neutron convert screen
Cross reading device to be scanned digital imaging plate, obtain the detection information of each width spent fuel element two-dimensional imaging；Digital imagery
Plate uses General Corporation's product, and size is 20cm × 40cm, model BAS IP MS 2040E；Reading device uses general public affairs
Take charge of product, model FLA 7000；
(7) each width spent fuel element two-dimensional imaging is detected by contrasting the detection information of each Data correction reference zone
Information is corrected；
(8) details in a play not acted out on stage, but told through dialogues to each width spent fuel element two-dimensional imaging detection information after correction and light field are deducted, then
The three-dimensional reconstruction of spent fuel element imaging is carried out using CT reconstruction techniques, obtains the three-dimensional imaging of spent fuel element；
(9) by completing the Non-Destructive Testing of spent fuel element to the analysis of three-dimensional imaging, concrete analysis step is：Rotation
The three-dimensional imaging of spent fuel element, observation spent fuel element pellet fragment pattern, clad failure state；Extract spent fuel element core
The three-dimensional imaging of block, the internal particle distribution of observation pellet；The three-dimensional imaging of the poly- part of hydrogen be present in extraction spent fuel element involucrum, point
Involucrum hydrogen combinate form state is analysed, and measures hydrogen aggressiveness product.
Claims (4)
- A kind of 1. presurized water reactor spent fuel element three-dimensional neutron photography lossless detection method, it is characterised in that：This method includes following Step：(1) neutron convert screen is placed in spent fuel element rear to be detected；(2) neutron streaming is introduced in front of spent fuel element, neutron streaming exposes neutron convert screen after spent fuel element Light, a width spent fuel element two-dimensional imaging is obtained, after exposing a period of time, remove neutron streaming；(3) neutron convert screen is translated to change projected position of the neutron streaming after spent fuel element on neutron convert screen, Or change a neutron convert screen；Keep the distance of spent fuel element and neutron convert screen constant simultaneously；Then along spentnuclear fuel member Part axle center rotates a certain angle spent fuel element；(4) constantly repeat step (two) and step (3), until rotate to 180 degree, obtain several spent fuel element two dimensions into Picture；Therebetween, the parameter and time for exposure all same of the neutron streaming introduced every time, the angle that spent fuel element rotates every time It is identical；(5) the same position selection size identical exposure area near each width spent fuel element two-dimensional imaging, which is used as, is somebody's turn to do The Data correction reference zone of two-dimensional imaging；(6) each width spent fuel element two-dimensional imaging of gained is transferred to digital imagery plate by neutron convert screen, then passes through reading Take device to be scanned digital imaging plate, obtain the detection information of each width spent fuel element two-dimensional imaging；(7) by contrasting the detection information of each Data correction reference zone to each width spent fuel element two-dimensional imaging detection information It is corrected；(8) details in a play not acted out on stage, but told through dialogues to each width spent fuel element two-dimensional imaging detection information after correction and light field are deducted, and are then used CT reconstruction techniques carry out the three-dimensional reconstruction of spent fuel element imaging, obtain the three-dimensional imaging of spent fuel element；(9) Non-Destructive Testing of the analysis completion spent fuel element to three-dimensional imaging is passed through.
- 2. presurized water reactor spent fuel element three-dimensional neutron photography lossless detection method as claimed in claim 1, it is characterised in that：Institute State along spent fuel element axle center and spent fuel element rotates a certain angle as 1 degree.
- 3. presurized water reactor spent fuel element three-dimensional neutron photography lossless detection method as claimed in claim 1, it is characterised in that：Institute It is dysprosium screen to state neutron convert screen.
- 4. presurized water reactor spent fuel element three-dimensional neutron photography lossless detection method as claimed in claim 1, it is characterised in that： Before three-dimensional reconstruction, each width spent fuel element two-dimensional imaging is intercepted, only retains spent fuel element two-dimensional imaging region.
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| CN106153648A (en) * | 2016-06-22 | 2016-11-23 | 深圳先进技术研究院 | A kind of static high-resolution Micro CT imaging system and apply its formation method |
| RU2628868C1 (en) * | 2016-07-22 | 2017-08-22 | Российская Федерация, от имени которой выступает Госкорпорация "Росатом" | Method of neutron radiography and installation for its implementation |
| CN113008918B (en) * | 2021-02-09 | 2022-07-01 | 中国原子能科学研究院 | Digital imaging plate for neutron photography of radioactive sample and nondestructive testing method |
| CN113916918B (en) * | 2021-11-03 | 2022-11-25 | 中国原子能科学研究院 | Detection system for neutron photography of radioactive samples |
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