CN216346206U - Primary side foreign matter blocking prevention plate of steam generator - Google Patents
Primary side foreign matter blocking prevention plate of steam generator Download PDFInfo
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- CN216346206U CN216346206U CN202122428092.1U CN202122428092U CN216346206U CN 216346206 U CN216346206 U CN 216346206U CN 202122428092 U CN202122428092 U CN 202122428092U CN 216346206 U CN216346206 U CN 216346206U
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Abstract
The utility model particularly relates to a primary side foreign matter blocking prevention plate of a steam generator, which comprises a main plate (1) and a positioning block (1); the two axial sides of the main board (1) are respectively connected with the axial middle side of the main board (1) in an opening and closing manner, so that the two axial sides of the main board (1) are opened and closed towards the axial middle side of the main board (1); the main board (1) is circumferentially and uniformly provided with positioning blocks (2). The primary side foreign matter blocking prevention plate of the steam generator provided by the utility model is reasonable in structure size, convenient to operate, capable of greatly shortening the time of working personnel and reducing the individual and collective radiation doses through a plurality of overhaul practical use verifications, and suitable for corresponding work of a nuclear power plant in the steam generator.
Description
Technical Field
The utility model relates to the technical field of nuclear power plant maintenance, in particular to a primary side foreign matter blocking prevention plate of a steam generator.
Background
The eddy current inspection is carried out to nuclear power plant's steam generator heat-transfer pipe annual fuel overhaul all, need open steam generator and once incline import and export hydroecium manhole, through putting into special detection tool inspection, and is consuming time longer, and the instrument is more complicated. The lower parts of the primary side inlet and outlet water chambers are respectively connected with a loop main pipe hot section and a transition section, and tools and other foreign matters fall down the main pipe and even the reactor core during inspection. After the two-chamber manhole is opened, a temporary cover plate needs to be additionally arranged at the main pipeline opening of the corresponding water chamber, so that the main pipeline which drops foreign matters is prevented. The operation belongs to the operation in the evaporator, and has extremely high risks of external irradiation, body surface pollution and pollution diffusion, and the working space is narrow and large in risk.
SUMMERY OF THE UTILITY MODEL
Based on this, it is necessary to incline the problem that imports and exports hydroecium trunk line foreign matter and drop to nuclear power plant's steam generator, provides a steam generator and inclines anti-foreign matter closure plate, and this closure plate structure size is reasonable, and the simple operation is verified through a plurality of overhaul in-service uses, can shorten the staff time greatly, reduces individual and collective radiation dose, is applicable to the nuclear power plant and corresponds work at steam generator.
In order to achieve the above purpose, the utility model provides the following technical scheme:
a primary side foreign body blocking prevention plate of a steam generator comprises a main plate and a positioning block; the two axial sides of the main board are respectively connected with the middle side of the main board in an opening and closing way, so that the two axial sides of the main board are opened and closed towards the middle side of the main board in the axial direction; the mainboard circumference evenly is equipped with the locating piece.
The working principle is as follows: according to the primary side foreign matter blocking prevention plate of the steam generator, two axial sides of the main plate are respectively connected with the axial middle side of the main plate in an opening and closing manner, so that the two axial sides of the main plate are opened and closed towards the axial middle side of the main plate, and the primary side foreign matter blocking prevention plate of the steam generator can easily pass through a manhole after being folded towards the operation side; the positioning blocks are uniformly arranged on the periphery of the main board, so that the primary side foreign matter blocking preventing plate of the steam generator is easily buckled on the extended part of the main pipe of the inlet/outlet water chamber on the primary side of the steam generator after being unfolded towards the operation side, and meanwhile, the offset is avoided.
Furthermore, a round hole is formed in the positioning block, and the diameter of the round hole is larger than the outer diameter of the hot section main pipeline and the outer diameter of the transition section main pipeline.
Further, the height H1 of the positioning block is more than 1 cm.
Furthermore, the main board comprises a left main board, a right main board and a middle main board, and the left main board, the middle main board and the right main board are sequentially connected in an opening and closing manner along the axial direction to form a whole circular board, so that the left main board and the right main board are opened and closed towards the middle main board.
Furthermore, the left main board, the middle main board and the right main board are sequentially connected by the hinge along the axial direction to form a whole circular board, so that the left main board and the right main board are opened and closed towards the middle main board.
Further, the width L1 of the middle main plate is smaller than the inner diameter of the manhole of the primary inlet/outlet water chamber of the steam generator.
Further, the handle, the positioning block and the hinge are respectively and permanently connected with the main board.
Further, the handle, the positioning block and the hinge are connected with the main board through riveting or welding respectively.
Furthermore, the middle side main plate is axially and symmetrically provided with the handle, so that a worker can conveniently hold the primary side foreign matter blocking prevention plate of the steam generator.
Furthermore, the end part of the circumferential direction of the main board is symmetrically provided with hanging holes, so that the steam generator can install the loosening rope in the transportation process of the primary side foreign matter prevention blocking plate, and the steam generator can hook the falling main pipeline of the primary side foreign matter prevention blocking plate.
Furthermore, the axial two ends of the middle side main board are symmetrically provided with hanging holes.
Furthermore, the radial two ends of the main plate are symmetrically provided with hanging holes.
Further, the primary side foreign matter blocking preventing plate of the steam generator is made of a light material with light weight and low hardness.
Further, the primary side foreign matter blocking prevention plate of the steam generator is made of an aluminum alloy or a titanium alloy.
The utility model has the beneficial technical effects that:
the primary side foreign matter blocking preventing plate of the steam generator can greatly shorten the working time of personnel and reduce the individual and collective dosage after being verified by a plurality of overhaul practical use, and the primary side foreign matter blocking preventing plate of the steam generator can be covered/taken off from a primary side inlet/outlet water chamber of an evaporator after the personnel enter the primary side inlet/outlet water chamber of the evaporator, the shortest time is 12 seconds, and the effect is very good.
Drawings
FIG. 1 is a front view of a primary side foreign matter blocking prevention plate of a steam generator according to the present invention;
FIG. 2 is a side view of a primary side foreign matter blocking preventing plate of the steam generator according to the present invention;
fig. 3 is a plan view of a primary side foreign matter blocking preventing plate of the steam generator according to the present invention.
In the figure, 1, a blocking plate; 2. positioning blocks; 3. a hinge; 4. a handle; 5. and (4) hoisting holes.
Detailed Description
In the description of the present invention, it is to be understood that the terms "left end", "right end", "above", "below", "outside", "inside", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, are not to be construed as limiting the present invention.
The present invention will be described in further detail with reference to the drawings and examples.
Example 1
Referring to fig. 1 to 3, the present invention provides a primary side foreign matter blocking prevention plate of a steam generator, including a main plate 1 and a positioning block 2; two axial sides of the main board 1 are respectively connected with the axial middle side of the main board 1 in an opening and closing manner, so that the two axial sides of the main board 1 are opened and closed towards the axial middle side of the main board 1; the main board 1 is evenly provided with positioning blocks 2 in the circumferential direction.
Mainboard 1 includes left side mainboard, right side mainboard and middle side mainboard, left side mainboard, middle side mainboard and right side mainboard are in proper order along the axial through hinge 3 connection formation whole plectane, make left side mainboard and right side mainboard open and shut to middle side mainboard.
The width L1 of the middle side main plate is smaller than the inner diameter of the manhole of the primary side inlet/outlet water chamber of the steam generator.
Be equipped with the round hole on the locating piece 2, the diameter of round hole is greater than hot section trunk line external diameter and changeover portion trunk line external diameter.
The height H1 of locating piece 2 is greater than 1cm, is difficult for the landing when covering the closure plate, and the location effect is better.
The handle 4, the positioning block 2 and the hinge 3 are respectively connected with the main board 1 through riveting or welding.
The middle side main plate is axially and symmetrically provided with the handle 4, so that a worker can conveniently hold the steam generator to prevent foreign matter from blocking on the primary side.
The axial both ends symmetry of middle side mainboard is equipped with lewis hole 5, the radial both ends symmetry of mainboard 1 is equipped with lewis hole 5, and the steam generator once inclines to prevent that the foreign matter closure plate installs the rope that relaxes in transit to and the steam generator once inclines to prevent that the foreign matter closure plate colludes after dropping the trunk line and get.
The primary side foreign matter blocking preventing plate of the steam generator is made of light materials such as aluminum alloy or titanium alloy which are light in material and low in hardness.
The primary side foreign matter blocking prevention plate of the steam generator has no pollution dose, and can be folded, packaged and transported by using a common bag for the first time. After the primary side foreign matter blocking prevention plate of the steam generator is used for the first time, radiation pollution is caused, surface radiation decontamination is required, and packaging, storage and transportation are carried out according to radiation management requirements.
The system working conditions suitable for the primary side foreign matter blocking prevention plate of the steam generator include, but are not limited to, the primary side manhole being opened during the low water level of a primary circuit and before the primary side operation (such as heat transfer pipe vortex) is started.
Before the primary side foreign matter blocking prevention plate of the steam generator is used, an operator performs 1:1 simulation training, two skilled cold/hot section operators are selected to enter the primary side inlet/outlet water chambers of the steam generator respectively, and the two operators are matched to connect/deliver the primary side foreign matter blocking prevention plate of the steam generator, so that the working time and the dosage can be reduced.
The work includes installing the primary side foreign matter blocking preventing plate before the work in the primary side inlet and outlet water chamber of the steam generator and detaching the primary side foreign matter blocking preventing plate before the manhole is closed after all the work is finished. The method comprises the following specific steps:
1. installing the primary side foreign matter blocking prevention plate of the steam generator of the present invention:
1) the working responsible person and the quality control QC personnel jointly witness that all parts of the primary side foreign matter blocking prevention plate of the steam generator are complete and are connected without loosening.
2) All operators, cooperators and other personnel needing to enter the water chamber at the inlet and outlet of the primary side of the steam generator need to wear protective articles such as paper clothes and dosimeters at key positions according to the regulations under the guidance of health-care physical personnel, and take relaxation measures.
3) Before the temporary manhole cover plate is opened, all personnel such as operators, coordinators and timekeepers of the primary side foreign matter blocking prevention plate of the steam generator are in place, and the primary side foreign matter blocking prevention plate of the steam generator is in place.
4) The operator opens the manhole temporary cover plate, the operator enters the manhole quickly, and at the same time, the operator receives the primary side foreign matter blocking plate of the steam generator, which is transferred by the operator, turns to place the primary side foreign matter blocking plate of the steam generator on the main pipe of the water chamber, the positioning is good, the folded primary side foreign matter blocking plate of the steam generator is opened, and the primary side foreign matter blocking plate of the steam generator is shaken quickly to confirm that the primary side foreign matter blocking plate of the steam generator is opened completely and is well positioned.
5) The operator turns round and withdraws from the manhole, before leaving the manhole, confirms fast that there is not the thing of leaving behind in the launching chamber, and the timing finishes simultaneously. The cooperator quickly closes the temporary cover plate and quits the room as soon as possible after the work is finished.
2. Dismantling the primary side foreign matter blocking prevention plate of the steam generator of the utility model:
1) all operators, coordinators and other personnel needing the water inlet chamber need to wear protective articles such as paper clothes and dosage meters of key parts according to the regulations under the guidance of health-care physical personnel, and take relaxation measures.
2) Before the temporary manhole cover plate is opened, operators, coordinators, timekeepers and other personnel for preventing foreign matters from blocking the plate at the primary side of the steam generator are in place.
3) The operator opens the manhole temporary cover plate, the operator enters the manhole quickly, the timing is started, the operator turns around quickly and folds the primary side foreign matter blocking preventing plate of the steam generator to deliver the primary side foreign matter blocking preventing plate of the steam generator to the operator, the operator can quit after quickly confirming that the main pipeline and the room are free from foreign matters, and the operation is finished in time.
4) The cooperator quickly closes the temporary cover plate and quits the room as soon as possible after the work is finished.
5) The working responsible person and the quality control QC personnel jointly witness that all parts of the primary side foreign matter blocking prevention plate of the steam generator are complete and are connected without loosening, and no part is left in a main system.
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 primary side foreign matter blocking prevention plate of a steam generator is characterized by comprising a main plate (1) and a positioning block (2); the two axial sides of the main board (1) are respectively connected with the axial middle side of the main board (1) in an opening and closing manner, so that the two axial sides of the main board (1) are opened and closed towards the axial middle side of the main board (1); the main board (1) is circumferentially and uniformly provided with positioning blocks (2).
2. The primary side foreign matter blocking prevention plate of the steam generator according to claim 1, wherein the positioning block (2) is provided with a circular hole, and the diameter of the circular hole is larger than the outer diameter of the hot section main pipe and the outer diameter of the transition section main pipe.
3. The primary foreign matter prevention plate of a steam generator according to claim 1, wherein the height H1 of the positioning block (2) is greater than 1 cm.
4. The primary side foreign matter blocking prevention plate of a steam generator according to claim 1, wherein the main plate (1) comprises a left main plate, a right main plate and a middle main plate, and the left main plate, the middle main plate and the right main plate are sequentially connected in an opening and closing manner along an axial direction to form a whole circular plate, so that the left main plate and the right main plate are opened and closed towards the middle main plate.
5. The primary side foreign matter blocking prevention plate of the steam generator according to claim 4, wherein the left main plate, the middle main plate and the right main plate are sequentially connected in an axial direction by a hinge (3) to form a whole circular plate, so that the left main plate and the right main plate are opened and closed toward the middle main plate; the hinge (3) is permanently connected with the main board (1).
6. The primary side foreign object prevention plate of a steam generator according to claim 4, wherein the width L1 of the middle side main plate is smaller than the inner diameter of the primary side inlet/outlet water chamber manhole of the steam generator.
7. The primary foreign matter blocking prevention plate of a steam generator according to claim 4, wherein the intermediate main plate is provided with a handle (4) in axial symmetry, and the handle (4) is permanently connected with the main plate (1).
8. The primary side foreign matter blocking prevention plate of the steam generator according to claim 1, wherein the main plate (1) is symmetrically provided with hanging holes (5) at the circumferential end, and the hanging holes (5) are permanently connected with the main plate (1).
9. A steam generator primary side foreign object prevention plate according to claim 5, 7 or 8, wherein the permanent connection is a riveted or welded connection.
10. The primary side foreign object prevention plate of the steam generator according to any one of claims 1 to 8, wherein the primary side foreign object prevention plate is made of a lightweight material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122428092.1U CN216346206U (en) | 2021-10-09 | 2021-10-09 | Primary side foreign matter blocking prevention plate of steam generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122428092.1U CN216346206U (en) | 2021-10-09 | 2021-10-09 | Primary side foreign matter blocking prevention plate of steam generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216346206U true CN216346206U (en) | 2022-04-19 |
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ID=81174344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122428092.1U Active CN216346206U (en) | 2021-10-09 | 2021-10-09 | Primary side foreign matter blocking prevention plate of steam generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216346206U (en) |
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2021
- 2021-10-09 CN CN202122428092.1U patent/CN216346206U/en active Active
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