CN110570962A - Local shielding structure of return bend of shielding performance adjustable - Google Patents
Local shielding structure of return bend of shielding performance adjustable Download PDFInfo
- Publication number
- CN110570962A CN110570962A CN201810266062.5A CN201810266062A CN110570962A CN 110570962 A CN110570962 A CN 110570962A CN 201810266062 A CN201810266062 A CN 201810266062A CN 110570962 A CN110570962 A CN 110570962A
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- China
- Prior art keywords
- shielding
- block
- cast steel
- steel shell
- cover plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910001208 Crucible steel Inorganic materials 0.000 claims abstract description 46
- 239000004698 Polyethylene Substances 0.000 claims abstract description 44
- 229920000573 polyethylene Polymers 0.000 claims abstract description 44
- -1 polyethylene Polymers 0.000 claims abstract description 27
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052796 boron Inorganic materials 0.000 claims abstract description 26
- 238000007789 sealing Methods 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 13
- 239000010959 steel Substances 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 8
- 239000003292 glue Substances 0.000 claims description 6
- 230000005855 radiation Effects 0.000 abstract description 4
- 230000002285 radioactive effect Effects 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F1/00—Shielding characterised by the composition of the materials
- G21F1/02—Selection of uniform shielding materials
- G21F1/08—Metals; Alloys; Cermets, i.e. sintered mixtures of ceramics and metals
- G21F1/085—Heavy metals or alloys
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F1/00—Shielding characterised by the composition of the materials
- G21F1/02—Selection of uniform shielding materials
- G21F1/10—Organic substances; Dispersions in organic carriers
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F3/00—Shielding characterised by its physical form, e.g. granules, or shape of the material
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Metallurgy (AREA)
- Ceramic Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Building Environments (AREA)
Abstract
The invention relates to the technical field of nuclear radiation protection, and provides a local shielding structure body of a bent pipe with adjustable shielding performance, wherein a U-shaped shielding structure is formed by a flange, a shielding body and a shielding sealing block, and the flange is machined by a steel plate; the shielding body is arranged on the outer side of the bent pipe and wraps the bent pipe in a U shape, the center line of the shielding body is consistent with the center line of the bent pipe, the shielding body is composed of an inner cast steel shell, an outer cast steel shell, a boron-containing polyethylene block/polyethylene block and an outer lead block, the outer lead block is arranged in a mode of being tightly attached to the inner surface of the outer cast steel shell, and the boron-containing polyethylene block/polyethylene block is filled between the outer lead block and the inner cast steel shell; the shielding sealing block is composed of a front cover plate, a lower cover plate, an upper cover plate and a rear cover plate clamping shielding block, and the upper cover plate of the shielding sealing block is fixed on an outer cast steel shell of the shielding body in a bolt mode. The bent pipe local shielding structure body with adjustable shielding performance has good processing formability and adjustable shielding performance, and can be suitable for various radioactive environments.
Description
Technical Field
The invention relates to the technical field of nuclear radiation protection, in particular to a bent pipe local shielding structure body with adjustable shielding performance.
Background
In order to prevent neutrons/gamma rays emitted by systems such as a reactor, a primary circuit and the like, the nuclear power device is provided with a biological shielding device to prevent harmful rays from irradiating and damaging personnel and equipment. The most typical bio-containment devices of nuclear power plants are containment vessels and reactor buildings. Inevitably, due to the requirements of other system designs, the biological shielding device is usually perforated to pass through cables, pipes and the like, which destroys the integrity of the original biological shielding structure, leads to a great increase of radiation dose at the perforated part and nearby areas, and leaves a radiation safety hazard.
The shielding of the cable is typically customized to the particular cable to which the appropriate shielding material is added. The shielding cost of the straight pipeline is high, the pipeline needing shielding generally adopts the design form of a bent pipe, and then a local shielding body is arranged on the outer side of the pipeline, so that the local dosage rise caused by the existence of the opening is reduced.
The conventional local shield is made of lead. Lead is used as a shielding material, has good casting performance and good gamma ray shielding capability, but has poor neutron shielding capability, and can only be applied to places needing to reduce gamma dose rate. Polyethylene shielding materials, such as lead-boron-polyethylene, have poor forming ability, and thus it is very difficult to ensure internal compactness for complex and irregular structures. Meanwhile, the lead-boron-polyethylene material has certain proportioning requirements, and cannot be proportioned according to various radioactive environments.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides the bent pipe local shielding structure body with adjustable shielding performance, which has good processing formability and adjustable shielding performance and can be suitable for various radioactive environments.
In order to solve the technical problems, the invention aims to realize the following technical measures: a local shielding structure body of a bent pipe with adjustable shielding performance is a U-shaped shielding structure consisting of a flange, a shielding body and a shielding sealing block, wherein the flange is machined by a steel plate; the shielding body is arranged on the outer side of the bent pipe and wraps the bent pipe in a U shape, the center line of the shielding body is consistent with the center line of the bent pipe, the shielding body is composed of an inner cast steel shell, an outer cast steel shell, a boron-containing polyethylene block/polyethylene block and an outer lead block, the outer lead block is arranged in a mode of being tightly attached to the inner surface of the outer cast steel shell, and the boron-containing polyethylene block/polyethylene block is filled between the outer lead block and the inner cast steel shell; the shielding sealing block is composed of a front cover plate, a lower cover plate, an upper cover plate and a rear cover plate which are clamped, the upper cover plate of the shielding sealing block is fixed on an outer cast steel shell of the shielding body in a bolt mode, and the shielding block is a lead block or a boron-containing polyethylene block or a lead boron polyethylene block or a stack of two or more materials.
In the technical scheme, the flange and the shielding wall are connected in a full-welding mode, the flange and the shielding body are connected in a bolt and gasket mode, and the size and the number of the bolts are designed redundantly according to the weight of the shielding body.
In the technical scheme, an outer cast steel shell of the shielding body is connected with a flange through bolts, the outer surface of an outer lead block is connected with the outer cast steel shell through steel bar nails, the steel bar nails with phi 2-phi 3mm are uniformly welded on the inner surface of the outer cast steel shell, the length of the steel bar nails is about 20-30 mm, the number of the steel bar nails is 10-20, and the thickness of the outer lead block is adjustable according to requirements; the outer surface of the boron-containing polyethylene block/polyethylene block is connected with the inner surface of the outer lead block by using anti-irradiation glue, and the thickness of the boron-containing polyethylene block/polyethylene block is adjustable according to the requirement; after the shielding material is installed, the shielding material is sealed by the inner cast steel shell, the connecting part of the inner cast steel shell and the outer cast steel shell can be connected in a full-welding or spot-welding mode, and the part of the inner cast steel shell, which is contacted with the shielding material, is connected by a bolt.
In the technical scheme, an inner lead block is arranged between the inner surface of the boron-containing polyethylene block/polyethylene block and the inner cast steel shell, the outer surface of the inner lead block is connected with the inner surface of the boron-containing polyethylene block/polyethylene block by using anti-irradiation glue, and the inner lead block and the inner cast steel shell are fixed by adopting bolts.
In the technical scheme, the upper cover plate, the lower cover plate and the shielding block of the shielding sealing block are connected through bolts, and the front cover plate, the rear cover plate and the shielding block of the shielding sealing block are connected through bolts.
The bent pipe local shielding structure adopts a U-shaped shielding structure, has a simple structure, is easy to process and form, can adjust the material and the thickness of the shielding body according to the use requirement, can be used under different environmental conditions, and has strong applicability.
Drawings
Fig. 1 and 2 are three-dimensional schematic views of the shielding structure of the present invention.
Fig. 3 is a cross-sectional view of the shield structure of the present invention, taken through the elbow axis.
Fig. 4 is a view from D-D of fig. 3 of the present invention.
Wherein: the novel steel plate comprises a flange 1, a front cover plate 2, a lower cover plate 3, an upper cover plate 4, a shielding block 5, a rear cover plate 6, a bent pipe 7, an inner lead block 8, an inner cast steel shell 9, a boron-containing polyethylene block 10, an outer lead block 11, an outer cast steel shell 12 and a shielding wall 13.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1, 2, 3, and 4, an embodiment of the present invention provides an elbow local shielding structure with adjustable shielding performance, where the elbow local shielding structure is a U-shaped shielding structure composed of a flange 1, a shielding body, and a shielding sealing block, the shielding sealing block includes a front cover plate 2, a lower cover plate 3, an upper cover plate 4, a shielding block 5, and a rear cover plate 6, and the shielding body includes an inner lead block 8, an inner cast steel shell 9, a boron-containing polyethylene block 10, an outer lead block 11, and an outer cast steel shell 12.
The flange 1 is welded on the shielding wall 13 in a full welding mode. The outer cast steel shell 12 of the shield body is connected with the flange 1 through bolts, and the size of the outer cast steel shell 12 is similar to that of the flange 1. The outer surface of the outer lead block 11 is connected with an outer cast steel shell 12 by a steel bar nail, the outer surface of the boron-containing polyethylene block 10 is connected with the inner surface of the outer lead block 11 by using anti-irradiation glue, and the outer surface of the inner lead block 8 is connected with the inner surface of the boron-containing polyethylene block 10 by using anti-irradiation glue. The connecting part of the inner cast steel shell 9 and the outer cast steel shell 12 is connected by spot welding, and the connecting part of the inner cast steel shell 9 and the inner lead block 8 is fixed by bolts. The shielding sealing block is fixed on the outer cast steel shell 12 through bolts of the upper cover plate 4, the shielding block 5 and the lower cover plate 3 are connected through bolts, and the front cover plate 2, the shielding block 5 and the rear cover plate 6 are connected through bolts.
The whole bent pipe local shielding structure realizes the 360-degree omnibearing shielding effect on the bent pipe through the above mode.
In the above embodiment, in order to ensure the mechanical strength, the outer cast steel shell 12 and the flange 1 are fixed by using 9M 12 × 45 studs to match with corresponding types of nuts and washers, reinforcing steel nails with a diameter of 2 to 3mm are uniformly welded on the inner surface of the outer cast steel shell 12, the length of the reinforcing steel nails is about 25mm, the number of the reinforcing steel nails is 10, the inner cast steel shell 9 and the inner lead block 8 are fixed by using 9M 12 × 45 studs to match with corresponding types of nuts and washers, and the upper cover plate 4 is fixed on the outer cast steel shell 12 by using 6M 8 × 80 studs to match with corresponding types of nuts and washers.
In the above embodiment, the thicknesses of the outer lead block 11, the boron-containing polyethylene block 10, and the inner lead block 8 of the shield can be adjusted as needed. The environment of use of this embodiment is storage 108BqCf sources and 105Bq60In a Co source test room, the bent pipe is a test room ventilation pipeline, and the outer diameter of the bent pipe is 300 mm. Through the design of shielding calculation, in order to reduce the shielding weight, the boron-containing polyethylene block 10 adopts a variable thickness design. The thickness of the inner lead block 8 is 10mm, and secondary gamma rays of neutrons after penetrating the boron-containing polyethylene block 10 are mainly shielded; the thickness of the boron-containing polyethylene block 10 is 90mm in the part vertical to the shielding wall and 120mm in the part parallel to the shielding wall; the thickness of the outer lead block 11 is 30 m; the length of the shielding block in the shielding sealing block is 300mm, the thickness of the shielding block is 50mm, and the shielding block is made of lead-boron-polyethylene.
After the whole installation is finished, the appearance of the embodiment is about 740mm multiplied by 650mm multiplied by 730mm, the weight is about 930kg, and the structure is compact, the reliability is strong, and the maintenance is easy. By means of the calculation result and the actually measured data result of MCNP software, the dosage rate of the local shielding structure body designed by the method is reduced by more than 95% at the position 1m away from the opening of the shielding wall and the center of the opening. The following table specifically shows:
Table 1 dose rate change comparison after installation of local shielding structure
| Whether or not to install a partial shield structure | MCNP calculated dose Rate (μ Gy/h) | Detecting device measuring dose rate (Gy/h) |
| Is that | 4.52 | 5.75 |
| Whether or not | 375 | 381 |
Details not described in detail in this specification are prior art known to the skilled person.
The above examples of the present invention are provided for illustrative clarity and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Not all embodiments are exhaustive. All obvious changes and modifications of the present invention are within the scope of the present invention.
Claims (5)
1. A local shielding structure of return bend of shielding property adjustable, characterized by: the U-shaped shielding structure is formed by a flange, a shielding body and a shielding sealing block, wherein the flange is machined by a steel plate; the shielding body is arranged on the outer side of the bent pipe and wraps the bent pipe in a U shape, the center line of the shielding body is consistent with the center line of the bent pipe, the shielding body is composed of an inner cast steel shell, an outer cast steel shell, a boron-containing polyethylene block/polyethylene block and an outer lead block, the outer lead block is arranged in a mode of being tightly attached to the inner surface of the outer cast steel shell, and the boron-containing polyethylene block/polyethylene block is filled between the outer lead block and the inner cast steel shell; the shielding sealing block is composed of a front cover plate, a lower cover plate, an upper cover plate and a rear cover plate which are clamped, the upper cover plate of the shielding sealing block is fixed on an outer cast steel shell of the shielding body in a bolt mode, and the shielding block is a lead block or a boron-containing polyethylene block or a lead boron polyethylene block or a stack of two or more materials.
2. the adjustable shielding performance bent pipe partial shielding structure according to claim 1, wherein: the flange and the shielding wall are connected in a full-welding mode, the flange and the shielding body are connected in a bolt and gasket mode, and the size and the number of the bolts are designed redundantly according to the weight of the shielding body.
3. The adjustable shielding performance bent pipe partial shielding structure according to claim 1, wherein: the outer cast steel shell of the shielding body is connected with the flange through bolts, the outer surface of the outer lead block is connected with the outer cast steel shell through steel bar nails, the steel bar nails with phi 2-phi 3mm are uniformly welded on the inner surface of the outer cast steel shell, the length of the steel bar nails is about 20-30 mm, the number of the steel bar nails is 10-20, and the thickness of the outer lead block is adjustable according to requirements; the outer surface of the boron-containing polyethylene block/polyethylene block is connected with the inner surface of the outer lead block by using anti-irradiation glue, and the thickness of the boron-containing polyethylene block/polyethylene block is adjustable according to the requirement; the inner cast steel shell and the outer cast steel shell are connected in a full-length welding or spot welding mode.
4. The adjustable shielding performance bent pipe partial shielding structure according to claim 1, wherein: an inner lead block is arranged between the inner surface of the boron-containing polyethylene block/polyethylene block and the inner cast steel shell, the outer surface of the inner lead block is connected with the inner surface of the boron-containing polyethylene block/polyethylene block by using anti-irradiation glue, and the inner lead block and the inner cast steel shell are fixed by adopting bolts.
5. The adjustable shielding performance bent pipe partial shielding structure according to claim 1, wherein: the upper cover plate, the lower cover plate and the shielding block of the shielding sealing block are connected through bolts, and the front cover plate, the rear cover plate and the shielding block of the shielding sealing block are connected through bolts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810266062.5A CN110570962A (en) | 2018-03-28 | 2018-03-28 | Local shielding structure of return bend of shielding performance adjustable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810266062.5A CN110570962A (en) | 2018-03-28 | 2018-03-28 | Local shielding structure of return bend of shielding performance adjustable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110570962A true CN110570962A (en) | 2019-12-13 |
Family
ID=68772439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810266062.5A Pending CN110570962A (en) | 2018-03-28 | 2018-03-28 | Local shielding structure of return bend of shielding performance adjustable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110570962A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111462932A (en) * | 2020-03-20 | 2020-07-28 | 中国辐射防护研究院 | Self-adaptive keel type lead-free shielding device special for glove box pipeline shielding |
| CN112141271A (en) * | 2020-10-19 | 2020-12-29 | 上海核工程研究设计院有限公司 | Shielding structure for ventilation pipeline of cargo hold of spent fuel transport ship |
| CN113948233A (en) * | 2021-10-22 | 2022-01-18 | 中国原子能科学研究院 | Fast reactor spent fuel transport container structure |
| CN113963817A (en) * | 2021-10-14 | 2022-01-21 | 中国舰船研究设计中心 | Nuclear radiation local shielding structure of nuclear power ship penetration reactor cabin pipeline |
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| CN203192420U (en) * | 2013-03-22 | 2013-09-11 | 中船重工天禾船舶设备江苏有限公司 | Lead borate polyethylene local shield for elbow penetrating through shield wall |
| CN203192421U (en) * | 2013-03-22 | 2013-09-11 | 中船重工天禾船舶设备江苏有限公司 | Lead boron polyethylene partial shielding body for penetrating through straight pipe of barrier shield |
| CN203192422U (en) * | 2013-03-22 | 2013-09-11 | 中船重工天禾船舶设备江苏有限公司 | Shielding casing pipe for preventing gas in air conduit from being activated by neutrons |
| CN106328232A (en) * | 2015-05-12 | 2017-01-11 | 南京中硼联康医疗科技有限公司 | Shielding body applied to shielding of radioactive rays |
| CN107230503A (en) * | 2016-03-25 | 2017-10-03 | 华北电力大学 | A kind of shield assembly structure with high-efficiency shielding performance |
-
2018
- 2018-03-28 CN CN201810266062.5A patent/CN110570962A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203192420U (en) * | 2013-03-22 | 2013-09-11 | 中船重工天禾船舶设备江苏有限公司 | Lead borate polyethylene local shield for elbow penetrating through shield wall |
| CN203192421U (en) * | 2013-03-22 | 2013-09-11 | 中船重工天禾船舶设备江苏有限公司 | Lead boron polyethylene partial shielding body for penetrating through straight pipe of barrier shield |
| CN203192422U (en) * | 2013-03-22 | 2013-09-11 | 中船重工天禾船舶设备江苏有限公司 | Shielding casing pipe for preventing gas in air conduit from being activated by neutrons |
| CN106328232A (en) * | 2015-05-12 | 2017-01-11 | 南京中硼联康医疗科技有限公司 | Shielding body applied to shielding of radioactive rays |
| CN107230503A (en) * | 2016-03-25 | 2017-10-03 | 华北电力大学 | A kind of shield assembly structure with high-efficiency shielding performance |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111462932A (en) * | 2020-03-20 | 2020-07-28 | 中国辐射防护研究院 | Self-adaptive keel type lead-free shielding device special for glove box pipeline shielding |
| CN111462932B (en) * | 2020-03-20 | 2023-07-21 | 中国辐射防护研究院 | Self-adaptive keel type lead-free shielding device special for glove box pipeline shielding |
| CN112141271A (en) * | 2020-10-19 | 2020-12-29 | 上海核工程研究设计院有限公司 | Shielding structure for ventilation pipeline of cargo hold of spent fuel transport ship |
| CN113963817A (en) * | 2021-10-14 | 2022-01-21 | 中国舰船研究设计中心 | Nuclear radiation local shielding structure of nuclear power ship penetration reactor cabin pipeline |
| CN113948233A (en) * | 2021-10-22 | 2022-01-18 | 中国原子能科学研究院 | Fast reactor spent fuel transport container structure |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191213 |
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| RJ01 | Rejection of invention patent application after publication |