CN112002446A - Reactor pressure vessel lower head with porous coating on outer wall surface - Google Patents
Reactor pressure vessel lower head with porous coating on outer wall surface Download PDFInfo
- Publication number
- CN112002446A CN112002446A CN202010738238.XA CN202010738238A CN112002446A CN 112002446 A CN112002446 A CN 112002446A CN 202010738238 A CN202010738238 A CN 202010738238A CN 112002446 A CN112002446 A CN 112002446A
- Authority
- CN
- China
- Prior art keywords
- porous coating
- pressure vessel
- reactor pressure
- wall surface
- lower head
- 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
Images
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C13/00—Pressure vessels; Containment vessels; Containment in general
- G21C13/08—Vessels characterised by the material; Selection of materials for pressure vessels
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C13/00—Pressure vessels; Containment vessels; Containment in general
- G21C13/02—Details
- G21C13/028—Seals, e.g. for pressure vessels or containment vessels
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C13/00—Pressure vessels; Containment vessels; Containment in general
- G21C13/02—Details
- G21C13/06—Sealing-plugs
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C13/00—Pressure vessels; Containment vessels; Containment in general
- G21C13/02—Details
- G21C13/06—Sealing-plugs
- G21C13/073—Closures for reactor-vessels, e.g. rotatable
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C21/00—Apparatus or processes specially adapted to the manufacture of reactors or parts thereof
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C9/00—Emergency protection arrangements structurally associated with the reactor, e.g. safety valves provided with pressure equalisation devices
- G21C9/016—Core catchers
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Manufacturing & Machinery (AREA)
- Structure Of Emergency Protection For Nuclear Reactors (AREA)
Abstract
The invention aims to disclose a reactor pressure vessel lower head with a porous coating on the outer wall surface, which comprises a bowl-shaped shell structure and a porous coating fixed on the outer wall, wherein the porous coating is formed by stainless steel powder in a spraying mode; compared with the prior art, the number of vaporization cores can be greatly increased, and the bubble nucleation speed is accelerated; the heat exchange area is increased; the bubble is enabled to grow and escape, meanwhile, the local fluid is stirred, the surface convection is enhanced, and therefore the heat exchange capacity of the fluid and the outer wall surface of the reactor pressure vessel is enhanced, compared with a smooth outer surface, the critical heat flux density of the fluid at the corresponding position of the outer wall surface of the reactor pressure vessel can be improved by more than 50%, the implementation of the retention of the molten material in the reactor is facilitated, the safety margin of a nuclear power plant under the accident condition can be improved, and the purpose of the invention is realized.
Description
Technical Field
The invention relates to a reactor pressure vessel lower end enclosure, in particular to a reactor pressure vessel lower end enclosure with a porous coating on the outer wall surface of a nuclear reactor of a pressurized water reactor nuclear power plant.
Background
The reactor pressure vessel is an important device in a primary circuit system of a pressurized water reactor nuclear power plant and is a pressure bearing sealing boundary. After the core of the pressurized water reactor nuclear power plant is melted in a serious accident, the pressure vessel can be further caused, and the integrity of the containment vessel is seriously threatened. When a reactor core fusion accident occurs, water is injected into a reactor cavity to cool the outer wall of a reactor pressure vessel, so that the heat of a fusion pool is led out, the integrity of the pressure vessel is kept, and therefore radiation substances are retained in the Reactor Pressure Vessel (RPV) to avoid serious nuclear pollution caused by diffusion, namely, an in-reactor melt retention technology (IVR) under the serious accident is one of important emergency safety measures.
When the heat flux density on the heating surface reaches a certain value, bubbles on the outer surface of the reactor pressure vessel increase to form a gas film to cover the heating surface, so that the heat transfer is blocked, the wall temperature rises quickly and loses control, and the critical point is called as critical heat flux density CHF or boiling crisis. One criterion for IVR success is that the heat flux density does not exceed the critical heat flux density (CHF). The ratio of the wall surface heat flow density of the pressure vessel to the local critical heat flow density is one of the key indexes for evaluating the IVR effectiveness, and the smaller the ratio, the larger the margin of IVR measures is.
At present, the operation of enhancing the boiling heat transfer performance of the outer wall of the lower end enclosure of the reactor pressure vessel is mainly focused on two aspects: firstly, machining the surface to form a surface channel which is beneficial to vapor-liquid flow; secondly, coating a porous coating on the surface of the pressure container by adopting a coating technology. Machining can change the mechanical properties of the wall body of the pressure container and reduce the safety of the pressure container, so that a more feasible method is to find a proper process and adopt a nondestructive method to coat the porous coating on the surface of the pressure container.
Therefore, a reactor pressure vessel lower head with a porous coating on the outer wall surface is particularly needed to solve the existing problems.
Disclosure of Invention
The invention aims to provide a reactor pressure vessel lower end enclosure with a porous coating on the outer wall surface, aiming at the defects of the prior art, the critical heat flux density of the outer wall surface of the reactor pressure vessel is improved, and the effectiveness of measures for retaining molten materials in a reactor under the serious accident condition of the reactor is enhanced.
The technical problem solved by the invention can be realized by adopting the following technical scheme:
the reactor pressure vessel lower head is characterized by comprising a bowl-shaped shell structure and a porous coating fixed on the outer wall, wherein the porous coating is formed by spraying stainless steel powder.
In one embodiment of the invention, the bowl-shaped shell structure comprises a cylinder body and a lower sealing head, and the lower sealing head is connected to the bottom of the cylinder body.
In one embodiment of the invention, the porous coating is provided on all or part of the outer wall of the bowl-shaped casing structure.
In one embodiment of the invention, the porous coating is formed by cold spraying or thermal spraying of stainless steel powder.
In one embodiment of the invention, the porosity of the porous coating is 35-55%.
In one embodiment of the present invention, the porous coating has a thickness of 200-500 microns.
Compared with the prior art, the lower end enclosure of the reactor pressure vessel with the porous coating on the outer wall surface can greatly increase the number of vaporization cores and accelerate the bubble nucleation speed; the heat exchange area is increased; the bubble is enabled to grow and escape, meanwhile, the local fluid is stirred, the surface convection is enhanced, and therefore the heat exchange capacity of the fluid and the outer wall surface of the reactor pressure vessel is enhanced, compared with a smooth outer surface, the critical heat flux density of the fluid at the corresponding position of the outer wall surface of the reactor pressure vessel can be improved by more than 50%, the implementation of the retention of the molten material in the reactor is facilitated, the safety margin of a nuclear power plant under the accident condition can be improved, and the purpose of the invention is realized.
The features of the present invention will be apparent from the accompanying drawings and from the detailed description of the preferred embodiments which follows.
Drawings
FIG. 1 is a schematic structural diagram of a reactor pressure vessel lower head with a porous coating on the outer wall surface.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
Examples
As shown in figure 1, the reactor pressure vessel lower head with the porous coating on the outer wall surface comprises a bowl-shaped shell structure and the porous coating 20 fixed on the outer wall, wherein the porous coating 20 is formed by spraying stainless steel powder.
In this embodiment, the bowl-shaped shell structure comprises a barrel 11 and a lower head 12, and the lower head 12 is connected to the bottom of the barrel 11.
In this embodiment, the porous coating 20 is provided on all or part of the outer wall of the bowl-like casing structure.
In the present embodiment, the porous coating layer 20 is formed by cold spraying or thermal spraying of stainless steel powder.
In this embodiment, the porosity of the porous coating layer 20 is 35-55%, and the thickness of the porous coating layer 20 is 200-500 μm.
The spraying process of the reactor pressure vessel lower head with the porous coating on the outer wall surface mainly comprises the following steps: firstly, pre-treating the surface of a base material, including sand blasting and the like, removing oil stains and oxide scales on the surface of the base material, and increasing the surface roughness so as to improve the bonding strength of the porous coating and the base material; secondly, preheating the surface of the substrate by the tail flame of the spray gun to reduce the thermal stress in the coating, wherein the preheating temperature is controlled between 100 ℃ and 150 ℃; and finally, spraying the porous coating, wherein flame spraying, electric arc spraying and the like are adopted in the spraying method for forming the porous coating with certain porosity, and the porous coatings with different porosities can be obtained by changing flame power, spraying distance, spraying angle and the like in the spraying process. If necessary, the base coat can be sprayed firstly, and then the porous coating can be sprayed to improve the bonding force of the coating and the substrate. And spraying the porous coating immediately after spraying the bottom layer.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims and their equivalents.
Claims (6)
1. The reactor pressure vessel lower head is characterized by comprising a bowl-shaped shell structure and a porous coating fixed on the outer wall, wherein the porous coating is formed by spraying stainless steel powder.
2. The reactor pressure vessel lower head with the porous coating on the outer wall surface as claimed in claim 1, wherein the bowl-shaped shell structure comprises a cylinder body and a lower head, and the lower head is connected to the bottom of the cylinder body.
3. The reactor pressure vessel lower head with a porous coating on the outer wall surface as claimed in claim 1, wherein the porous coating is arranged on all or part of the outer wall of the bowl-shaped shell structure.
4. The reactor pressure vessel lower head with the porous coating on the outer wall surface as claimed in claim 1, wherein the porous coating is formed by cold spraying or hot spraying stainless steel powder.
5. The reactor pressure vessel lower head with the porous coating on the outer wall surface as claimed in claim 1, wherein the porosity of the porous coating is 35-55%.
6. The reactor pressure vessel lower head with the porous coating on the outer wall surface as claimed in claim 1, wherein the thickness of the porous coating is 200-500 μm.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010738238.XA CN112002446A (en) | 2020-07-28 | 2020-07-28 | Reactor pressure vessel lower head with porous coating on outer wall surface |
| PCT/CN2021/097608 WO2022022052A1 (en) | 2020-07-28 | 2021-06-01 | Bottom closure of reactor pressure vessel and preparation method therefor |
| GB2300186.0A GB2613087A (en) | 2020-07-28 | 2021-06-01 | Bottom closure of reactor pressure vessel and preparation method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010738238.XA CN112002446A (en) | 2020-07-28 | 2020-07-28 | Reactor pressure vessel lower head with porous coating on outer wall surface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112002446A true CN112002446A (en) | 2020-11-27 |
Family
ID=73462322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010738238.XA Pending CN112002446A (en) | 2020-07-28 | 2020-07-28 | Reactor pressure vessel lower head with porous coating on outer wall surface |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN112002446A (en) |
| GB (1) | GB2613087A (en) |
| WO (1) | WO2022022052A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022022052A1 (en) * | 2020-07-28 | 2022-02-03 | 上海核工程研究设计院有限公司 | Bottom closure of reactor pressure vessel and preparation method therefor |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014031579A (en) * | 2012-07-13 | 2014-02-20 | Toshiba Corp | Processing method of heat transfer member and heat transfer member |
| CN103903658B (en) * | 2014-03-19 | 2016-08-17 | 清华大学 | A kind of end socket with enhanced boiling heat transfer netted groove connection array hole surface |
| CN204066752U (en) * | 2014-08-07 | 2014-12-31 | 清华大学 | A kind of pressure vessel with intensive ring-shaped groove structural outer surface |
| CN112002446A (en) * | 2020-07-28 | 2020-11-27 | 上海核工程研究设计院有限公司 | Reactor pressure vessel lower head with porous coating on outer wall surface |
-
2020
- 2020-07-28 CN CN202010738238.XA patent/CN112002446A/en active Pending
-
2021
- 2021-06-01 GB GB2300186.0A patent/GB2613087A/en active Pending
- 2021-06-01 WO PCT/CN2021/097608 patent/WO2022022052A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022022052A1 (en) * | 2020-07-28 | 2022-02-03 | 上海核工程研究设计院有限公司 | Bottom closure of reactor pressure vessel and preparation method therefor |
| GB2613087A (en) * | 2020-07-28 | 2023-05-24 | Shanghai Nuclear Eng Res & Design Inst Co Ltd | Bottom closure of reactor pressure vessel and preparation method therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022022052A1 (en) | 2022-02-03 |
| GB2613087A (en) | 2023-05-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105551536B (en) | Reactor core melt catcher with internal cooling capacity | |
| Buongiorno | Can corrosion and CRUD actually improve safety margins in LWRs? | |
| CN107210070B (en) | The cooling and closed system of water cooling, water-moderated reactor reactor core fusant | |
| CN107309405B (en) | A kind of casting method of super-duplex stainless steel 5A material impeller | |
| CN111562282B (en) | Test device and method for simulating transient reaction of melt at high temperature | |
| CN103050155B (en) | Accident mitigation device and manufacture method, nuclear plant pressure vessels, accident mitigation method | |
| US20190139654A1 (en) | High temperature nuclear fuel system for thermal neutron reactors | |
| CN105047235A (en) | Melt in-pile retention passive cooling system in nuclear reactor severe accident state | |
| CN112002446A (en) | Reactor pressure vessel lower head with porous coating on outer wall surface | |
| CN112201371A (en) | Reactor in-reactor melt retention system adopting spray cooling | |
| Wang et al. | Oxidation behavior and kinetics of magnetron-sputtered Cr-coated Zr alloy cladding in 1000–1300℃ steam environment | |
| CN214410806U (en) | Reactor pressure vessel lower head with porous coating on outer wall surface | |
| Li et al. | Cold sprayed superhydrophilic porous metallic coating for enhancing the critical heat flux of the pressurized water-cooled reactor vessel in nuclear power plants | |
| Zhong et al. | Effect of grooves on nucleate boiling heat transfer from downward facing hemispherical surface | |
| CN111341469A (en) | Immersed injection system applied to cooling of pressure vessel of nuclear power station | |
| US20220134488A1 (en) | Flux-cored welding wire and preparation method and use thereof, porous coating and preparation method thereof | |
| CN202917186U (en) | Accident alleviating device and pressure vessel used in nuclear power station | |
| KR102168888B1 (en) | Coating method on the cladding of accident tolerant fuel using silicate and nuclear fuel cladding using the same | |
| Min et al. | COMSOL simulation for design of induction heating system in VULCAN facility | |
| Ponomarev-Stepnoi et al. | Prospects for using microelements in VVÉR reactors | |
| Wang et al. | Cooling time and CHF enhancement of reactor vessel cooling process by flame sprayed porous coating in different orientations | |
| TR2023000826T2 (en) | SUBHEAD OF A REACTOR PRESSURE TANK AND THEIR PREPARATION METHOD | |
| RU2773222C1 (en) | Method for cooling and protecting the nuclear reactor vessel when it is heated in an emergency and a device for its implementation | |
| CN113798513B (en) | Additive manufacturing method capable of regulating and controlling steel defects for nuclear reactor pressure vessel | |
| CN219040082U (en) | High-temperature self-protection fuel rod |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: No. 29 Hong Cao Road, Xuhui District, Shanghai Applicant after: Shanghai Nuclear Engineering Research and Design Institute Co.,Ltd. Applicant after: EAST CHINA University OF SCIENCE AND TECHNOLOGY Address before: No. 29 Hong Cao Road, Xuhui District, Shanghai Applicant before: SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE Co.,Ltd. Applicant before: EAST CHINA University OF SCIENCE AND TECHNOLOGY |
|
| CB02 | Change of applicant information |