CN215220278U - Foreign matter preventing device for flange joint surface of nuclear reactor pressure vessel - Google Patents
Foreign matter preventing device for flange joint surface of nuclear reactor pressure vessel Download PDFInfo
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- CN215220278U CN215220278U CN202120682222.1U CN202120682222U CN215220278U CN 215220278 U CN215220278 U CN 215220278U CN 202120682222 U CN202120682222 U CN 202120682222U CN 215220278 U CN215220278 U CN 215220278U
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 invention relates to the technical field of nuclear power station reactor pressure vessel maintenance, and particularly discloses a foreign matter prevention device for a flange joint surface of a nuclear reactor pressure vessel. The device comprises a plurality of foreign matter prevention covers, wherein the side edges of the foreign matter prevention covers are spliced end to form an annular structure arranged on the flange joint surface of the pressure vessel; the anti-foreign body cover is of a Z-shaped structure along the whole radius tangent line, the upper end face of the anti-foreign body cover is supported on the upper plane of the false top cover flange, the lower end face of the anti-foreign body cover is supported on the sealing surface of the container cylinder flange, and the width of the lower end face is slightly larger than that of the sealing surface of the container cylinder flange. The device has the characteristics of compact structure, light dead weight and simple and convenient operation, and can realize manual direct installation; the device not only avoids the risk of damaging the flange sealing surface of the barrel body of the primary circuit pressure vessel of the nuclear reactor, but also realizes the function of protecting the flange junction surface from foreign matters, and has strong practicability.
Description
Technical Field
The invention belongs to the technical field of nuclear power station reactor pressure vessel maintenance, and particularly relates to a foreign matter prevention device for a flange joint surface of a nuclear reactor pressure vessel.
Background
The reactor pressure vessel of a nuclear power plant is an important component of the pressure boundary of a reactor coolant system, and is internally provided with internals, fuel assemblies and control and measurement elements required for safe operation. The pressure vessel of the nuclear reactor is formed by connecting two parts of a vessel cylinder body and a top cover in a flange mode through a fastening sealing piece. The nuclear power station refueling overhaul needs to open a top cover of a nuclear reactor pressure vessel to execute refueling and overhaul work of internal components, and the cleanliness of a flange joint surface, related states and other factors under the condition of equipment opening are related to the tightness and operation safety of the nuclear reactor.
In the existing maintenance process of a nuclear power station overhaul unit, when a reactor finishes discharging a primary circuit and is discharged to a low water level, a false top cover needs to be installed on a reactor core to block an opening of the reactor and reduce the dosage of environmental radiation. In the state, the sealing surface of the pressure vessel cylinder flange is in an exposed state, and meanwhile, a gap is reserved at the joint position of the lower flange and the vessel cylinder flange to ensure that the false top cover is not interfered in the installation process. Because maintenance work such as guide post dismounting, main bolt hole inspection repair and refueling pool steel cladding repair needs to be carried out in the area of the flange joint surface of the nuclear reactor pressure vessel, tools, equipment parts and metal scraps generated by cutting and polishing in the process of operation may fall into or scratch the flange seal surface of the vessel barrel or enter the inside of the reactor through a gap of the flange joint surface. The flange sealing surface of the vessel cylinder body is damaged by hard foreign matters, the sealing performance of a primary circuit pressure boundary of the nuclear reactor is influenced, once the foreign matters enter the inside of the nuclear reactor, equipment such as in-reactor components and the like can be damaged, and the operation safety of the nuclear reactor is seriously influenced.
Disclosure of Invention
The invention aims to provide a foreign matter preventing device for a flange joint surface of a nuclear reactor pressure vessel, which solves the problems that external foreign matters can not be prevented from falling into and scratching a vessel cylinder flange seal surface and the foreign matters enter the inside of the nuclear reactor through a flange joint surface gap in the prior art.
The technical scheme of the invention is as follows: a foreign matter prevention device for a flange joint surface of a nuclear reactor pressure vessel comprises a plurality of foreign matter prevention covers, wherein the side edges of the foreign matter prevention covers are spliced end to form an annular structure arranged on the flange joint surface of the pressure vessel; the anti-foreign body cover is of a Z-shaped structure along the whole radius tangent line, the upper end face of the anti-foreign body cover is supported on the upper plane of the false top cover flange, the lower end face of the anti-foreign body cover is supported on the sealing surface of the container cylinder flange, and the width of the lower end face is slightly larger than that of the sealing surface of the container cylinder flange.
The foreign matter prevention cover comprises a supporting plate, a protective screen and a flanged protective plate, wherein the left side surface and the right side surface of the upper end and the lower end of the protective screen are respectively provided with the supporting plate with a trapezoidal flat plate structure and the flanged protective plate.
The lower end face of the flanged protection plate is provided with a plurality of bases, and the bases support the whole foreign-matter-preventing cover on the flange sealing face of the container barrel.
The front edge of the trapezoidal flat plate with the flanging protection plate is provided with a flanging connecting part which is vertical upwards, the flanging connecting part is fixedly connected with the protection screen, and the lower end face of the protection screen is parallel and level to the lower end face of the flanging protection plate.
The protective screen is of an L-shaped plate structure, and the height of the protective screen is slightly greater than that of the false roof flange; the protruding part at the upper end of the protective screen faces inwards and is fixedly connected with the supporting plate.
The width of the supporting plate is slightly smaller than the outer diameter of the false roof flange; the supporting plate is supported on the upper plane of the false roof flange.
The slopes of the trapezoidal edges on the two sides of the supporting plate and the flanged protection plate are the same, and the straight lines of the trapezoidal edges on the two sides of the supporting plate and the flanged protection plate are overlapped with certain diameter axes of the plurality of foreign matter prevention covers which are spliced to form the annular structure.
The base with 3 columnar structures is arranged at the bottom end of the flanging protection plate along the circumferential direction, and the base is of a hollow cylindrical structure with an upper opening and a lower opening.
The supporting plate, the protective screen, the base with the flanging protective plate and the base with the flanging protective plate are all made of nylon materials.
The protective screen is directly and fixedly connected with the supporting plate and the protection plate with the turned edge through bolts.
The invention has the following remarkable effects: the foreign matter preventing device for the flange joint surface of the nuclear reactor pressure vessel has the characteristics of compact structure, light dead weight and simplicity and convenience in operation, and can realize manual direct installation; the anti-foreign body protection device is used during the working condition of low water level of a loop of a nuclear power station overhaul unit, a plurality of anti-foreign body covers are spliced into a circular ring body according to the sequence and completely cover on a flange sealing surface of a container barrel, so that the risk of damage to the flange sealing surface of the loop pressure container barrel of the nuclear power station is avoided, the effect of protecting the foreign bodies on a flange joint surface is realized, and the anti-foreign body protection device has strong practicability.
Drawings
FIG. 1 is a schematic structural view of a nuclear reactor pressure vessel flange junction surface foreign object prevention device according to the present invention;
FIG. 2 is an enlarged schematic view of a nuclear reactor pressure vessel flange junction surface foreign object prevention device according to the present invention;
FIG. 3 is a schematic view of the state of the device for preventing foreign matter on the flange joint surface of a nuclear reactor pressure vessel according to the present invention;
in the figure: 1. a foreign matter prevention cover; 2. a support plate; 3. a protective screen; 4. a protection plate with a flanging; 5. a base; 6. a false top cover; 7. a container barrel.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
As shown in fig. 1 and 2, the device for preventing the foreign matters on the flange joint surface of the nuclear reactor pressure vessel comprises a plurality of foreign matter preventing covers 1 which can be spliced end to end, wherein each foreign matter preventing cover 1 comprises a supporting plate 2, a protecting screen 3 and a flanged protecting plate 4, the flanged protecting plate 4 is integrally of a trapezoidal plate-shaped structure, and the width of the flanged protecting plate is slightly larger than that of the flange seal surface of a vessel cylinder 7; after the plurality of foreign matter prevention covers 1 are sequentially spliced through the side edges, a seamless connection annular structure can be formed according to the slope of trapezoidal surfaces on two sides of the flanged protection plate 4, and the base 5 arranged on the lower end of the flanged protection plate 4 is placed on the flange sealing surface of the container barrel 7, wherein 3 bases 5 with columnar structures are uniformly arranged on the bottom plate of each foreign matter prevention cover 1 along the circumference, the base 5 is integrally of a hollow cylindrical structure with an upper opening and a lower opening, and the flanged protection plate 4 can be prevented from being directly contacted with the flange sealing surface of the container barrel 7; the edge of the upper end of the flanged protection plate 4 is a vertical flanged connection part; the whole protective screen 3 is of an L-shaped plate structure, the height of the protective screen is slightly greater than that of the flange of the false top cover 6, the protective screen 3 is integrally fixed on the flanging connecting part with the flanging protective plate 4, and the lower end of the protective screen 3 is flush with the lower end surface of the flanging protective plate 4, for example, the connection between the flanging connecting part with the flanging protective plate 4 and the protective screen 3 can be fixedly connected through bolts through screw holes formed in the flanging connecting parts of the protective screen 3 and the flanging protective plate 4; the upper end of the L-shaped protective screen 3 is provided with an inward protruding part and is fixedly connected with a supporting plate 2 of a trapezoidal flat plate structure, the width of the supporting plate 2 is slightly smaller than the outer diameter of a flange of a false top cover 6 and is used for supporting the foreign matter prevention cover 1 on the upper plane of the flange of the false top cover 6, and the slope of the trapezoidal surface at the two sides of the supporting plate 2 is consistent with that of the trapezoidal surface with a flanging protective plate 4; the foreign body prevention covers 1 are spliced through the side edges and are sequentially arranged on the flange joint surface of the nuclear reactor pressure vessel to form a circular structure integrally, and the annular structure bodies of the support plate 2 and the flanged protection plate 4 are positioned on the horizontal plane; the supporting plate 2, the protective screen 3, the flanging protective plate 4 and the base 5 in each foreign matter prevention cover 1 are all made of nylon materials, so that the installation is light and convenient, and the flange sealing surface of the container barrel 7 can be prevented from being damaged by the self.
As shown in fig. 3, the specific working process of the device for preventing foreign matter on the flange joint surface of the nuclear reactor pressure vessel provided by the invention is as follows: placing all the foreign matter prevention covers 1 in the flange joint surface area of the nuclear reactor pressure vessel, installing one of the foreign matter prevention covers 1 on the upper plane of a false top cover 6 flange through a support plate 2, and completely covering a flange sealing surface of a vessel cylinder 7 with a flanging protection plate 4; installing other adjacent foreign matter prevention covers 1, and adjusting the sides of the two covers to be parallel and level without staggered edges; continuously installing all the foreign matter prevention covers 1, and adjusting the foreign matter prevention covers forwards and backwards when necessary to ensure the flatness of the foreign matter prevention device; and finally, checking that all the supporting plates 2 and the flanged protection plates 4 are installed in place, and no exposed position exists in a gap between the flange sealing surface of the container barrel 7 and the flange joint surface.
Through the application of this patent during the low water level operating mode of a nuclear power station overhaul unit return circuit, not only avoided the risk of the sealed face of the 7 flange of nuclear reactor return circuit pressure vessel barrel, still realized the effect of flange faying face foreign matter protection, had very strong practicality. The flanged protection plate 4 can prevent external foreign matters from falling into and colliding with a flange sealing surface of the container cylinder 7, for example, tools and equipment used for working in a flange joint surface area of the nuclear reactor pressure container, parts formed by equipment maintenance and the like, so that the sealing surface is prevented from being damaged, and a loop pressure boundary of the nuclear reactor pressure container is protected. The protective screen 3 can prevent external foreign matters from entering the inside of the nuclear reactor through a gap between the flange joint surface and the false roof, and the operation safety of the nuclear reactor is prevented from being influenced. Meanwhile, the novel solar water heater has the characteristics of compact structure, light dead weight and simplicity and convenience in operation, can realize manual direct installation, and has strong practicability.
Claims (10)
1. The foreign matter preventing device for the flange joint surface of the nuclear reactor pressure vessel is characterized by comprising a plurality of foreign matter preventing covers (1), wherein the side edges of the foreign matter preventing covers (1) are spliced end to form an annular structure arranged on the flange joint surface of the pressure vessel; the foreign matter prevention cover (1) is of a Z-shaped structure along the whole radius tangent line, the upper end face of the foreign matter prevention cover is supported on the upper plane of a flange of the false top cover (6), the lower end face of the foreign matter prevention cover is supported on the flange sealing face of the container cylinder body (7), and the width of the lower end face is slightly larger than that of the flange sealing face of the container cylinder body (7).
2. The device for preventing the foreign matters on the flange joint surface of the pressure vessel of the nuclear reactor as claimed in claim 1, wherein the foreign matter preventing cover (1) comprises a supporting plate (2), a protecting screen (3) and a flanged protecting plate (4), wherein the supporting plate (2) with a trapezoidal flat plate structure and the flanged protecting plate (4) are respectively arranged on the left side surface and the right side surface of the upper end and the lower end of the protecting screen (3).
3. The device for preventing the foreign matters on the flange joint surface of the nuclear reactor pressure vessel as claimed in claim 2, wherein a plurality of bases (5) are arranged on the lower end surface of the flanged protection plate (4), and the bases (5) support the whole foreign matter prevention cover (1) on the flange seal surface of the vessel cylinder (7).
4. The device for preventing the foreign matters on the flange joint surface of the nuclear reactor pressure vessel as claimed in claim 2, wherein the front edge of the trapezoidal flat plate with the flange protection plate (4) is provided with an upward vertical flange connecting part, and the flange connecting part is fixedly connected with the protection screen (3) and ensures that the lower end surface of the protection screen (3) is flush with the lower end surface of the flange protection plate (4).
5. The device for preventing foreign bodies on the flange joint surface of a nuclear reactor pressure vessel as claimed in claim 2, characterized in that the protective screen (3) is of an L-shaped plate-like structure, the height of which is slightly greater than that of the flange of the false roof (6); the protruding part at the upper end of the protective screen (3) is inward and is fixedly connected with the supporting plate (2).
6. A nuclear reactor pressure vessel flange faying surface foreign object prevention device as claimed in claim 2, characterized in that the width of the support plate (2) is slightly smaller than the outer diameter of the false roof (6) flange; the supporting plate (2) is supported on the upper plane of the flange of the false top cover (6).
7. The foreign matter prevention device for the flange joint surface of the nuclear reactor pressure vessel as claimed in claim 2, wherein the slopes of the trapezoidal edges at the two sides of the support plate (2) and the flanged protection plate (4) are the same, and the straight line of the trapezoidal edges at the two sides of the support plate (2) and the flanged protection plate (4) coincides with certain diameter axes of the annular structure formed by splicing the plurality of foreign matter prevention covers (1).
8. The foreign matter prevention device for the flange joint surface of the nuclear reactor pressure vessel as claimed in claim 2, wherein 3 bases (5) with cylindrical structures are arranged at the bottom end of the flanged protection plate (4) along the circumferential direction, and the bases (5) are hollow cylindrical structures with upper and lower openings.
9. The device for preventing the foreign matters on the flange joint surface of the nuclear reactor pressure vessel as claimed in claim 2, wherein the supporting plate (2), the protective screen (3), the protection plate (4) with the flanging and the base (5) arranged at the bottom end of the protection plate (4) with the flanging are all made of nylon materials.
10. The device for preventing the foreign matters on the flange joint surface of the nuclear reactor pressure vessel as claimed in claim 2, wherein the protective screen (3) is directly and fixedly connected with the support plate (2) and the protection plate (4) with the flanging through bolts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120682222.1U CN215220278U (en) | 2021-04-02 | 2021-04-02 | Foreign matter preventing device for flange joint surface of nuclear reactor pressure vessel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120682222.1U CN215220278U (en) | 2021-04-02 | 2021-04-02 | Foreign matter preventing device for flange joint surface of nuclear reactor pressure vessel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215220278U true CN215220278U (en) | 2021-12-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120682222.1U Active CN215220278U (en) | 2021-04-02 | 2021-04-02 | Foreign matter preventing device for flange joint surface of nuclear reactor pressure vessel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215220278U (en) |
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2021
- 2021-04-02 CN CN202120682222.1U patent/CN215220278U/en active Active
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