CN108414545B - Ray detection method for BOSS welding seam of million-kilowatt nuclear power station - Google Patents
Ray detection method for BOSS welding seam of million-kilowatt nuclear power station Download PDFInfo
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- CN108414545B CN108414545B CN201810162193.9A CN201810162193A CN108414545B CN 108414545 B CN108414545 B CN 108414545B CN 201810162193 A CN201810162193 A CN 201810162193A CN 108414545 B CN108414545 B CN 108414545B
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Abstract
The invention discloses a ray detection method for a BOSS welding seam of a million kilowatt-level nuclear power station, which comprises the following steps: placing a first film on a second side of the BOSS weld; placing a radioactive source on a first side of the BOSS weld and radiating the BOSS weld by the radioactive source to image the first side of the BOSS weld on the first film; placing a second film on a first side of the BOSS weld; placing a radioactive source on a second side of the BOSS weld and radiating the BOSS weld by the radioactive source so as to image the second side of the BOSS weld on the second film; developing the first film and the second film to display the overproof defects existing on the first side and the second side of the BOSS welding seam on the first film and the second film; and determining the actual positions of the overproof defects in the first side and the second side of the BOSS welding seam according to the positions of the overproof defects on the first film and the second film. The ray detection method for the BOSS welding seam of the million kilowatt-level nuclear power station can timely find out the overproof defect of the BOSS welding seam.
Description
Technical Field
The invention relates to the technical field of radiographic inspection, in particular to a radiographic inspection method for BOSS (Boss weld joint) of a million kilowatt-level nuclear power station.
Background
In a nuclear power plant, a branch pipe is fixed to a parent pipe mainly by welding, so that a BOSS weld (a pipe seat weld of a pipe and the branch pipe) is formed between the branch pipe and the parent pipe.
Because the BOSS welding line is limited by a special structure and belongs to the connection of a small branch pipe and a main pipe, the detection cannot be carried out as the conventional welding line during the ray inspection, so that no effective detection method is provided for detecting the defects of the BOSS welding line, and the defects of the BOSS welding line cannot be found, so that great potential safety hazards are caused.
Disclosure of Invention
Therefore, a ray detection method for BOSS weld joints of million kilowatt-level nuclear power stations is needed to be provided for solving the problem of great potential safety hazard caused by the absence of an effective BOSS weld joint detection method.
A ray detection method for a BOSS welding seam of a million kilowatt nuclear power station comprises the following steps:
placing a first film on a second side of the BOSS weld;
placing a radiation source on a first side of the BOSS weld and causing the radiation source to radiate the BOSS weld to image the first side of the BOSS weld on the first film;
placing a second film on a first side of the BOSS weld;
placing the radiation source on a second side of the BOSS weld and causing the radiation source to radiate the BOSS weld to image the second side of the BOSS weld on the second film;
developing the first film and the second film to display the overproof defects on the first film and the second film on the first side and the second side of the BOSS weld;
determining actual positions of the out-of-limit defects in a first side and a second side of the BOSS weld according to the positions of the out-of-limit defects on the first film and the second film;
wherein the first side and the second side are respectively located at two opposite sides of the branch pipe.
According to the ray detection method for the BOSS welding line of the million kilowatt-level nuclear power station, provided by the invention, the BOSS welding line is transmitted in a 180-degree mode to form the first film and the second film, and then the actual position of the overproof defect in the whole BOSS welding line is determined by observing the overproof defect displayed on the first film and the second film.
In one embodiment, the step of placing the first film on the second side of the BOSS weld specifically comprises the steps of:
and placing the first film on the second side of the BOSS welding seam and clinging to the BOSS welding seam.
In one embodiment, the step of placing the second film on the first side of the BOSS weld specifically comprises the steps of:
and placing the second film on the first side of the BOSS welding seam and clinging to the BOSS welding seam.
In one embodiment, the radiation source transmits the BOSS weld in a double-wall double-shadow manner.
In one embodiment, the radiation source selects a focal length of 8 times or more the outside diameter of the manifold.
In one embodiment, the source employs Ir 192.
In one embodiment, the step of locating the out-of-standard defect on the first side of the BOSS weld specifically comprises the steps of:
presetting a first mark on a main pipe positioned at a first side of the BOSS welding line;
placing a first film with a lead block fixed at one end on a second side of the BOSS welding line, presetting a second mark corresponding to the first mark on the first film, and arranging the second mark on the lead block;
presetting an orientation mark for marking the orientation of the second mark on the first film on the mother tube positioned on the first side;
placing a radiation source on the first side and radiating the BOSS weld to image the first side of the BOSS weld on the first film;
developing the first film to reveal the overproof defect present on the first side of the BOSS weld on the first film;
finding out a BOSS welding seam corresponding to the first mark according to the second mark and restoring the on-site cloth condition according to the direction mark;
determining an actual position of the out-of-standard defect in a first side of the BOSS weld according to the position of the out-of-standard defect on the first film;
and the step of positioning the standard exceeding defect on the second side of the BOSS welding seam specifically comprises the following steps:
presetting a first mark on a mother pipe positioned on the second side of the BOSS welding line;
placing a second film with a lead block fixed at one end on the first side of the BOSS welding line, presetting a second mark corresponding to the first mark on the second film, and arranging the second mark on the lead block;
an orientation mark for indicating the orientation of the second mark on the second film is preset on the mother tube on the second side.
Placing a radiation source on the second side and radiating the BOSS weld to image the second side of the BOSS weld on the second film;
developing the second film to reveal the overproof defects on the second side of the BOSS weld on the second film;
finding out a BOSS welding seam corresponding to the first mark according to the second mark and restoring the on-site cloth condition according to the direction mark;
determining an actual location of the out-of-spec defect in a second side of the BOSS weld based on the location of the out-of-spec defect on the second film.
In one embodiment, the center of the bottom edge of the first film is aligned with the first mark when the first film is placed on the second side of the BOSS weld;
and when the second film is placed on the first side of the BOSS weld, the center of the bottom edge of the second film is aligned with the first mark.
In one embodiment, said step of processing said first film and said second film to reveal said BOSS weld on said first film and said second film is performed in the presence of an out-of-tolerance defect on a first side and a second side of said BOSS weld, said out-of-tolerance defect being determined when a length of said defect revealed on said first film and said second film is greater than 1/3 of the calculated thickness;
wherein the calculated thickness is (Φ A- Φ C)/2, Φ A is a distance between vertices of two sides of the BOSS weld facing each other, and Φ C is an inner diameter of the branch pipe.
In one embodiment, after said step of determining the actual location of said out-of-spec defect in said BOSS weld in said first and second sides based on the location of said out-of-spec defect on said first and second films, further comprising the step of:
and performing patching on the BOSS welding line at the actual position of the standard exceeding defect.
Drawings
Fig. 1 is a flowchart of a ray detection method for a BOSS weld of a megawatt nuclear power plant according to an embodiment of the present invention;
FIG. 2 is a layout diagram of films in the method for radiographic inspection of BOSS welds of a megawatt nuclear power plant as provided in FIG. 1;
FIG. 3 is a schematic radial view of a BOSS weld seam detection method for a million kilowatt nuclear power plant as provided in FIG. 1;
FIG. 4 is a schematic diagram illustrating the positioning of an out-of-standard defect in the ray detection method for BOSS weld of the megawatt nuclear power plant provided in FIG. 1;
FIG. 5 is a cross-sectional view of a BOSS weld in the method for radiographic inspection of the BOSS weld in the megawatt nuclear power plant provided in FIG. 1.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1-3, a preferred embodiment of the present invention provides a method for detecting BOSS weld seam of a megawatt nuclear power station, which includes the steps of:
s110: placing the first film 40 on the second side b of the BOSS weld seam 10;
specifically, the first film 40 is placed against the BOSS weld 10 when placed on the second side b of the BOSS weld 10 to ensure that the geometric unsharpness of the parts on the first film 40 reaches a minimum. Specifically, the model of the first film 40 uses a model C2 (AGFA D3/caresream-M100), and the specification of the intensifying screen is as follows: front screen Pb0.2mm, middle screen Pb2 × 0.1mm, and rear screen Pb0.2mm.
S120: placing radiation source 60 on a first side a of BOSS weld 10 (first side a and second side b are on opposite sides of manifold 70) and causing radiation source 60 to radiate BOSS weld 10 such that first side a of BOSS weld 10 is imaged on first film 40;
specifically, a double-wall double-shadow transillumination mode is adopted to radiate the BOSS welding seam 10, the radioactive source 60 adopts Ir192, the model of the device adopts a 880DELTA source machine, the focal spot size of the radioactive source 60 adopts phi 2 x 2mm or phi 3 x 2mm, and under the same activity, the smaller focal spot size is better. In other embodiments, the transillumination mode of the radiation source 60, the type of radiation source 60, the equipment type, and the size of the focal spot are not limited. Further, in order to enhance the ray quality, a filter plate is used to filter the radiation source 60 and perform back radiation shielding to reduce the "edge erosion" effect.
More specifically, the radiation source 60 employs a focal length of 8 times or more the outer diameter of the manifold, and the minimum focal length Fmin can be calculated according to the following equation:
Fmin＝db/Ug+b
in the formula: b is the BOSS head outside diameter (outside diameter of the branch pipe 70); d is the focal size; ug is geometric uncertainty, and it is necessary that Ug is 0.3 or less when 192Ir is used with reference to RCC-M1.
S130: placing a second film on the first side a of the BOSS weld seam 10;
specifically, the second film is placed against the BOSS weld 10 when placed on the first side a of the BOSS weld 10, so as to ensure that the geometric ambiguity of each part on the second film reaches a minimum value. The second film is selected to be the same model as the first film 40.
S140: placing the radiation source 60 on the second side b of the BOSS weld seam 10 and causing the radiation source 60 to radiate the BOSS weld seam 10 so that the second side b of the BOSS weld seam 10 is imaged on the second film;
specifically, a double-wall double-shadow transillumination mode is adopted to radiate the BOSS welding seam 10, the radioactive source 60 adopts Ir192, the model of the device adopts a 880DELTA source machine, the focal spot size of the radioactive source 60 adopts phi 2 x 2mm or phi 3 x 2mm, and under the same activity, the smaller focal spot size is better. In other embodiments, the transillumination mode of the radiation source 60, the type of radiation source 60, the equipment type, and the size of the focal spot are not limited. Furthermore, in order to enhance ray quality, a filter plate is adopted to filter the radioactive source and carry out back heat radiation shielding so as to reduce the edge corrosion effect.
More specifically, radiation source 60 employs a focal length that is 8 or more times the outside diameter of manifold 70, and minimum focal length Fmin can be calculated according to the following equation:
Fmin＝db/Ug+b
in the formula: b is the BOSS head outside diameter (outside diameter of the branch pipe 70); d is the focal size; ug is geometric uncertainty, and it is necessary that Ug is 0.3 or less when 192Ir is used with reference to RCC-M1.
S150: developing the first film 40 and the second film to display the overproof defect 11 existing on the first side a and the second side b of the BOSS weld seam 10 on the first film 40 and the second film;
specifically, the defect 11 is judged to be out of specification when the length of the defect shown on the first film 40 or the second film is greater than 1/3 of the calculated thickness; wherein the calculated thickness is (Φ a- Φ C)/2 (see fig. 5), Φ a is the distance between the apex of the first side a and the apex of the second side b of the BOSS weld 10, and Φ C is the inner diameter of the branch pipe 70.
Wherein the first side a and the second side b are oppositely disposed with respect to the branch duct 70, i.e., the first film 40 and the second film are transilluminated at 180 ° to each other with respect to the branch duct 70.
S160: and determining the actual positions of the standard exceeding defects 11 in the first side a and the second side b of the BOSS welding seam 10 according to the positions of the standard exceeding defects 11 on the first film 40 and the second film, thereby determining the actual positions of the standard exceeding defects 11 in the BOSS welding seam 10 in the whole BOSS welding seam 10.
According to the ray detection method for the BOSS welding seam of the million kilowatt-level nuclear power station, provided by the embodiment of the invention, the BOSS welding seam 10 is transmitted in a 180-degree mode to form the first film 40 and the second film, and then the actual position of the overproof defect 11 in the whole BOSS welding seam 10 is determined by observing the overproof defect 11 displayed on the first film 40 and the second film, so that the ray detection method is not only suitable for the special structural requirement of the BOSS welding seam 10, but also can be found in time when the overproof defect occurs in the BOSS welding seam 10, and the potential safety hazard is avoided.
In this embodiment, the step of positioning the out-of-standard defect 11 on the first side a of the BOSS weld seam 10 specifically includes:
presetting a first mark 30 on the mother pipe 20 positioned at the first side a of the BOSS welding seam 10;
specifically, a first mark 30 is preset on the parent pipe 20 at a position opposite to the branch pipe 70 and spaced from the BOSS weld joint 10, in this embodiment, the first mark 30 is a mark a in fig. 2, and it is noted that: the first mark 30 may be arranged in other ways, such as any other letter or pattern, such as mark B, mark C, or mark triangle. More specifically, the first mark 30 is made by using an ink marker to appear on the mother tube 20 and no ambiguity occurs after a certain time, and of course, in other embodiments, the first mark 30 may be made by using other kinds of markers, which is not limited herein.
More specifically, the first mark 30 is preset on the main tube 20 at the very center of the main tube opposite to the branch tube 70 to facilitate the subsequent positioning of the first film 40 and the centering of the radiation source 60.
Placing a first film 40 with a lead block 50 fixed at one end on a second side b opposite to the first side a of the BOSS welding seam 10, presetting a second mark aligned with the first mark 30 on the first film 40, and arranging the second mark on the lead block 50;
at this time, the second mark on the first film 40 is aligned with the first mark 30, and the first mark 30 corresponding to the scene is found according to the second mark on the first film 40, so as to determine that the BOSS weld seam 10 transmitted on the first film 40 with the second mark is the BOSS weld seam 10 with the first mark 30 at the scene, thereby facilitating to find the position where the corresponding out-of-standard defect 11 occurs (if there is a defect on the BOSS weld seam 10). When the letter B is used as the first mark 30, the letter B is used as the aligned second mark, and the second mark is provided corresponding to the first mark 30.
In the actual use process, the first mark 30 is preset on the mother pipe 20 on the first side a of the BOSS weld seam 10, the first film 40 with the lead block 50 fixed at one end is placed on the second side b of the BOSS weld seam 10 opposite to the first side a, the second mark corresponding to the first mark 30 is preset on the first film 40, and the second mark is arranged on the lead block 50 and can be exchanged.
Specifically, the first film 40 with the lead block 50 fixed at one end is placed on the second side b of the BOSS weld 10 opposite to the first side a, the second mark aligned with the first mark 30 is preset on the first film 40, the second mark is arranged in the lead block 50, and the lead block 50 is fixed at a vertex angle of the first film 40, so as to avoid the lead block 50 interfering with the imaging of the BOSS weld 10 on the first film 40.
More specifically, the lead block 50 is fixed to the upper right corner of the first film 40 when the first film 40 is facing the human body, and specifically, the lead block 50 has a thickness of not less than 5mm, preferably 5 mm. In other embodiments, the lead block 50 can be fixed to the lower right, upper left, or lower left corner of the first film 40.
The lead block 50 may further be provided with an isometric figure number and a weld line number, which may be used as a unique indication of the BOSS weld line 10, so as to find the BOSS weld line 10 corresponding to the first film 40.
Further, it is also possible to arrange to center the center of the bottom edge of the first film 40 with the first mark 30.
An orientation mark 80 (see fig. 2) for indicating the orientation of the second mark on the first film 40 is preset on the mother tube 10 at the first side a.
For example, when the second mark is fixed to the right side of the first film 40, the orientation mark 80 may be provided as an arrow toward the right side to indicate the orientation of the second mark on the first film 40, and when the scene is aligned by the first film 40, the position of the BOSS weld 10 is found by the one-to-one correspondence of the second mark and the first mark 30, and then how the first film 40 is placed on the scene is aligned by the orientation mark 80, so that the position of the defect existing in the BOSS weld 11 can be accurately determined by the out-of-tolerance defect 11 on the first film 40.
In other embodiments, the step of presetting the orientation mark 80 for indicating the orientation of the second mark on the first film 40 on the mother tube 20 on the first side a may also be performed before the step of presetting the first mark 30 on the mother tube 20 on the first side a of the BOSS weld 10, the step of placing the first film 40 with the lead block 50 fixed at one end on the second side b of the BOSS weld 10 opposite to the first side a, the step of presetting the second mark aligned with the first mark 30 on the first film 40, the second mark being disposed between the lead blocks 50, and the step of presetting the first mark 30 on the mother tube 20 on the first side a of the BOSS weld 10.
Placing the radiation source 60 on the first side a and radiating the BOSS weld seam 10 such that the first side a of the BOSS weld seam 10 is imaged on the first film 40;
developing the first film 40 to show the overproof defect 11 of the BOSS weld 10 on the first film 40;
specifically, after the first film 40 is developed and the first film 40 is dried, the first film 40 will show the out-of-standard defect 11 of the BOSS weld seam 10 on the first side a.
Finding the BOSS welding seam 10 corresponding to the first mark 30 according to the second mark and restoring the on-site cloth situation;
the actual location of the out-of-tolerance defect 11 (see FIG. 4) in the BOSS weld is determined based on the location of the out-of-tolerance defect 11 on the first film 40.
Specifically, the horizontal and vertical distances between the standard-exceeding defect 11 and the center of the bottom edge of the first film 40 are measured;
finding the position at the horizontal and vertical distances from the first mark 30 is the actual position of the standard deviation defect 11 in the BOSS weld 10.
When the first film 40 is judged to have the overproof defect 11, the defect of the BOSS welding seam 10 can be found through the second mark, the isometric figure number and the welding seam number, and the direction of the first film 40 at the moment is found through the direction mark 80 so as to restore all directions of film distribution at the moment.
In the present embodiment, the horizontal distance L and the vertical distance H between the out-of-standard defect 11 and the center of the bottom edge of the first film 40 are measured, for example, when the out-of-standard defect 11 is located at the right side of the center of the bottom edge of the first film 40, the actual position of the out-of-standard defect 11 can be found in the BOSS weld by measuring the horizontal distance L and the vertical distance H from the first mark 30 to the right and measuring the vertical distance H from the first mark 30 to the upper, for example, when the out-of-standard defect 11 is located at the left of the center of the bottom edge of the first film 40, the actual position of the out-of-standard defect 11 can be found in the BOSS weld by measuring the horizontal distance L and the vertical distance H from the first mark 30 to the left.
The method for locating the standard exceeding defect 11 on the second side b of the BOSS weld joint 10 is the same as the method for locating the standard exceeding defect 11 on the second side b of the BOSS weld joint 10, and is not described herein again.
Further, the method further includes, after step S160, the steps of:
and (5) excavating and repairing the BOSS welding seam 10 at the actual position of the standard exceeding defect 11.
For the defect along the positive projection center position of the BOSS head (branch pipe 70), directly performing patching after positioning is completed, and paying attention to the fact that the deposition thickness (calculated thickness of the BOSS welding line 10) after patching is completed meets the requirement of minimum reserved thickness (the residual thickness of the BOSS welding line 10 after a part is dug out, the BOSS welding lines 10 with different sizes have different minimum reserved thicknesses and are generally not less than 5 mm); aiming at incomplete fusion of the whole circle along the direction of the groove, the groove can be firstly polished in the process of eliminating the defect, the ray detection is carried out after the minimum reserved thickness is polished, the repair welding is carried out after the defect is eliminated, the ray detection is carried out after the repair welding is finished, and the replacement processing is carried out if the defect cannot be eliminated.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A ray detection method for BOSS welding seams of a million kilowatt nuclear power station is characterized by comprising the following steps:
placing a first film on a second side of the BOSS weld;
placing a radiation source on a first side of the BOSS weld and causing the radiation source to radiate the BOSS weld to image the first side of the BOSS weld on the first film; placing a second film on a first side of the BOSS weld;
placing the radiation source on a second side of the BOSS weld and causing the radiation source to radiate the BOSS weld to image the second side of the BOSS weld on the second film;
developing the first film and the second film to display the overproof defects on the first film and the second film on the first side and the second side of the BOSS weld;
determining actual positions of the out-of-limit defects in a first side and a second side of the BOSS weld according to the positions of the out-of-limit defects on the first film and the second film; the method for positioning the standard exceeding defect on the first side of the BOSS welding seam specifically comprises the following steps:
presetting a first mark on a main pipe positioned at a first side of the BOSS welding line;
placing a first film with a lead block fixed at one end on a second side of the BOSS welding line, presetting a second mark aligned with the first mark on the first film, and arranging the second mark on the lead block;
placing a radiation source on the first side and radiating the BOSS weld to image the first side of the BOSS weld on the first film;
developing the first film to reveal the overproof defect present on the first side of the BOSS weld on the first film;
finding the sheet distribution condition of the BOSS welding seam restoration site corresponding to the first mark according to the second mark;
determining an actual position of the out-of-standard defect in a first side of the BOSS weld according to the position of the out-of-standard defect on the first film;
the first side and the second side are respectively positioned on two opposite sides of the branch pipe, and the first film and the second film are formed by transilluminating 180 degrees relative to the branch pipe.
2. The radiographic inspection method for the BOSS weld of the megawatt-class nuclear power plant according to claim 1, wherein the step of placing the first film on the second side of the BOSS weld specifically includes the steps of:
and placing the first film on the second side of the BOSS welding seam and clinging to the BOSS welding seam.
3. The radiographic inspection method for the BOSS weld of the megawatt-class nuclear power plant according to claim 1, wherein the step of placing the second film on the first side of the BOSS weld specifically comprises the steps of:
and placing the second film on the first side of the BOSS welding seam and clinging to the BOSS welding seam.
4. The method for radiographic inspection of a BOSS weld of a megawatt nuclear power plant as claimed in claim 1, wherein the radiation source transmits the BOSS weld in a double-wall double-shadow manner.
5. The method for radiographic inspection of BOSS welds in million kilowatt nuclear power plants according to claim 1, wherein said radioactive source selects a focal length greater than or equal to 8 times the outside diameter of the branch pipe.
6. The method for detecting the BOSS weld of the million kilowatt nuclear power plant according to claim 1, wherein the radiation source adopts Ir 192.
7. The radiographic inspection method for the BOSS weld of the megawatt-class nuclear power plant according to any one of claims 1 to 6, wherein the positioning of the out-of-standard defect existing on the first side of the BOSS weld specifically comprises the further steps of:
presetting an orientation mark for marking the orientation of the second mark on the first film on the mother tube positioned on the first side;
finding out a BOSS welding seam corresponding to the first mark according to the second mark and restoring the on-site cloth condition according to the direction mark;
and the step of positioning the standard exceeding defect on the second side of the BOSS welding seam specifically comprises the following steps:
presetting a first mark on a mother pipe positioned on the second side of the BOSS welding line;
placing a second film with a lead block fixed at one end on the first side of the BOSS welding line, presetting a second mark aligned with the first mark on the second film, and arranging the second mark on the lead block;
presetting an orientation mark for marking the orientation of the second mark on the second film on the mother tube positioned on the second side;
placing a radiation source on the second side and radiating the BOSS weld to image the second side of the BOSS weld on the second film;
developing the second film to reveal the overproof defects on the second side of the BOSS weld on the second film;
finding out a BOSS welding seam corresponding to the first mark according to the second mark and restoring the on-site cloth condition according to the direction mark;
determining an actual location of the out-of-spec defect in a second side of the BOSS weld based on the location of the out-of-spec defect on the second film.
8. The method of radiographic inspection of a BOSS weld of a megawatt nuclear power plant of claim 7, wherein when the first film is placed on the second side of the BOSS weld, the center of the bottom edge of the first film is aligned with the first mark;
and when the second film is placed on the first side of the BOSS weld, the center of the bottom edge of the second film is aligned with the first mark.
9. The method for radiographic inspection of BOSS welds in a megawatt nuclear power plant according to any one of claims 1 to 6, wherein the step of processing the first and second films to display the out-of-tolerance defects on the first and second films on the first and second sides of the BOSS weld, wherein the out-of-tolerance defect is determined when the length of the defect displayed on the first and second films is greater than 1/3 of the calculated thickness;
wherein the calculated thickness is (Φ A- Φ C)/2, Φ A is a distance between vertices of two sides of the BOSS weld facing each other, and Φ C is an inner diameter of the branch pipe.
10. The method for radiographic inspection of BOSS welds in a megawatt nuclear power plant as claimed in claim 9, further comprising after said step of determining the actual location of the out-of-spec defect in the first and second sides of the BOSS weld based on the location of the out-of-spec defect on the first and second films, the step of:
and performing patching on the BOSS welding line at the actual position of the standard exceeding defect.
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| CN112834533B (en) * | 2021-01-06 | 2023-01-31 | 广东核电合营有限公司 | Nondestructive testing method for branch pipe welding seam of nuclear power station |
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