CN113851243B - Cofferdam device with debris collection function in nuclear power station - Google Patents
Cofferdam device with debris collection function in nuclear power station Download PDFInfo
- Publication number
- CN113851243B CN113851243B CN202111215632.6A CN202111215632A CN113851243B CN 113851243 B CN113851243 B CN 113851243B CN 202111215632 A CN202111215632 A CN 202111215632A CN 113851243 B CN113851243 B CN 113851243B
- Authority
- CN
- China
- Prior art keywords
- cofferdam
- flow channel
- frame
- nuclear power
- fixedly connected
- 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.)
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000007787 solid Substances 0.000 claims abstract description 6
- 238000001914 filtration Methods 0.000 claims description 7
- 125000006850 spacer group Chemical group 0.000 claims 1
- 239000012634 fragment Substances 0.000 abstract description 27
- 230000009471 action Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 239000002826 coolant Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000941 radioactive substance Substances 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D1/00—Details of nuclear power plant
- G21D1/02—Arrangements of auxiliary equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D3/00—Control of nuclear power plant
- G21D3/04—Safety arrangements
- G21D3/06—Safety arrangements responsive to faults within the plant
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Structure Of Emergency Protection For Nuclear Reactors (AREA)
Abstract
The invention discloses a cofferdam device with a debris collection function in a nuclear power station, which relates to the technical field of a safety system of the nuclear power station and comprises the following components: upper portion bounding wall, fixed orifices and cofferdam frame, the top fixedly connected with upper portion bounding wall of cofferdam frame, the even fixedly connected with hole spacing frame in bottom of cofferdam frame, and even fixedly connected with flow channel between the adjacent hole spacing frame, the both sides and the one end of cofferdam frame bottom all evenly are provided with the fixed orifices, the even fixedly connected with bounding wall support in top of upper portion bounding wall one end, and the one end of bounding wall support all with the one end fixed connection at flow channel top. According to the invention, the upper coaming is fixedly connected to the top end of the cofferdam frame, and is of a solid structure, so that the incoming flow generates vertical flow under the action of the upper coaming, fragments at the bottom of the containment vessel are pressed by water flow, the cofferdam frame cannot be overturned, and the fragments are prevented from entering the filter screen and the pit.
Description
Technical Field
The invention relates to the technical field of nuclear power station safety systems, in particular to a cofferdam device with a debris collection function in a nuclear power station.
Background
The pressurized water reactor is the most widely used nuclear power plant in the world at present, when a loss of coolant accident (LOCA) and a main steam pipeline rupture (MSLB) occur, high-energy pipelines are ruptured to cause a large amount of high-temperature and high-pressure gas to be injected into a containment, the high-pressure gas impacts various devices and materials in the containment to possibly cause a large amount of fragments to be generated, the fragments can block a reactor core in an passive reactor core cooling system in the containment, so that the flowing resistance of the coolant is increased, the heat discharge capacity of the reactor core is reduced, the leakage risk of overheat and radioactive substances of the reactor is increased, and in order to reduce the amount of fragments entering the reactor core and a filter screen under the accident condition, the nuclear power plant is provided with steel cofferdam blocking fragment materials in front of a pit filter screen;
experimental study finds that because the current steel cofferdam is in the in-process that blocks the piece material, rivers can cross the steel cofferdam and get into the containment pit, along with the increase of water velocity, the piece material receives the entrained impact of rivers, and the piece can cross cofferdam entering filter screen and pit along with rivers, makes the barrier function inefficacy of cofferdam, under this condition, just needs to design a cofferdam device that can satisfy the piece and block the requirement, can collect the piece simultaneously, can promote the security of equipment greatly.
Disclosure of Invention
The invention aims to provide a cofferdam device with a debris collecting function in a nuclear power station, which aims to solve the problem that the water flow speed is increased, debris materials are impacted by entrainment of water flow, and the debris can cross over the cofferdam along with the water flow to enter a filter screen and a pit, so that the blocking function of the cofferdam is invalid.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a cofferdam apparatus with debris collection function in a nuclear power plant, comprising: upper portion bounding wall, fixed orifices and cofferdam frame, the top fixedly connected with upper portion bounding wall of cofferdam frame, the even fixedly connected with hole spacing frame in bottom of cofferdam frame, and even fixedly connected with flow channel between the adjacent hole spacing frame, the both sides and the one end of cofferdam frame bottom all evenly are provided with the fixed orifices, the even fixedly connected with bounding wall support in top of upper portion bounding wall one end, and the one end of bounding wall support all with the one end fixed connection at flow channel top.
Preferably, the upper coaming is of a solid structure.
Preferably, the inside of flow channel all is provided with the passageway filter screen, flow channel's one end, both sides and top all evenly are provided with the filtration pore.
Preferably, the filter holes are designed at equal intervals on the flow channel, and the filter holes are round holes with the diameter of 1.6 mm.
Preferably, the side view of the upper coaming and the hole spacing frame is L-shaped, and supports the flow channel.
Preferably, the flow channel is of trapezoidal design, the flow channel widening in the direction of water flow.
Preferably, the bottom end of the flow channel is provided with a filter hole.
Preferably, the fixing holes are designed at equal intervals, and the fixing holes are symmetrically arranged about the vertical center line of the cofferdam frame.
Preferably, the coaming support supports the flow channel, and triangular design is formed among the cofferdam frame, the coaming support and the flow channel.
Compared with the prior art, the invention has the beneficial effects that:
1. the flow channels are uniformly arranged at the lower part of the cofferdam frame and are in a trapezoid design, the design is obtained by an analysis method combining numerical analysis and experimental study by utilizing a fluid mechanics principle, a channel filter screen is arranged in the flow channels, the diameter of a filter hole is 1.6mm, water flows out through the filter hole, fragments in the water flow stay in the flow channels under the filtration of the channel filter screen, the fragments are collected through the flow channels, the fragments can block a reactor core in an passive reactor core cooling system in a containment, so that the flow resistance of a coolant is increased, the heat discharge capacity of the reactor core is reduced, the leakage risk of overheat and radioactive substances of the reactor is increased, serious safety accidents are caused, and the occurrence rate of the safety accidents can be reduced by effectively removing the fragments;
2. through the top fixedly connected with upper portion bounding wall at cofferdam frame, upper portion bounding wall is solid structure, under the effect of upper portion bounding wall, makes the inflow produce the flow of vertical direction, makes the piece that is located the containment bottom receive the suppression of rivers, can not cross cofferdam frame, avoids the piece to get into filter screen and pit.
Drawings
FIG. 1 is a schematic elevational view of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a schematic rear view of the present invention;
fig. 4 is a schematic left-view structure of the present invention.
In the figure: 1. an upper coaming; 2. a hole spacing frame; 3. a flow channel; 4. a filter hole; 5. a fixing hole; 6. a cofferdam frame; 7. a channel filter screen; 8. and (5) coaming support.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-4, the present invention provides a technical solution: a cofferdam apparatus with debris collection function in a nuclear power plant, comprising: the upper coaming 1, the fixing holes 5 and the cofferdam frame 6 are fixedly connected with the upper coaming 1 at the top end of the cofferdam frame 6, the upper coaming 1 is of a solid structure, the incoming flow direction can be changed, a part of incoming flow can flow downwards, a vertical downward acting force is given to bottom fragments, and the possibility that the fragments cross over the cofferdam is reduced;
the upper coaming 1 and the hole spacing frame 2 are L-shaped in side view, and support the flow channel 3; the method comprises the steps of carrying out a first treatment on the surface of the
The bottom end of the cofferdam frame 6 is uniformly and fixedly connected with the hole spacing frames 2, and the flow channels 3 are uniformly and fixedly connected between the adjacent hole spacing frames 2, the flow channels 3 are in a trapezoid design, the flow channels 3 are widened along the water flow direction, and fragments can be retained in the flow channels 3 after entering the flow channels 3;
the inside of the flow channel 3 is provided with a channel filter screen 7, one end, two sides and the top end of the flow channel 3 are uniformly provided with filter holes 4, water flows out through the filter holes 4, and the bottom end of the flow channel 3 is provided with the filter holes 4, so that the structural strength of the cofferdam frame 6 is improved, and the water flow speed at the inlet position of the flow channel 3 is increased, so that fragments smoothly enter the flow channel 3;
the filter holes 4 are formed in the flow channel 3 at equal intervals, the filter holes 4 are round holes with the diameter of 1.6mm, fragments can be reserved in the flow channel 3 while water flows smoothly pass through the holes, the flow channel 3 is in a trapezoid design, the design is obtained by an analysis method combining numerical analysis and experimental study through the hydrodynamics principle, a channel filter screen 7 is arranged in the flow channel 3, the diameter of the filter holes 4 is 1.6mm, water flows out through the filter holes 4, but fragments in the water flow are reserved in the flow channel 3 under the filtration of the channel filter screen 7, the fragments are collected through the flow channel 3, meanwhile, an upper coaming 1 above the flow channel 3 is of a solid structure, the incoming flow generates vertical flow under the action of the upper coaming 1, the fragments at the bottom of a containment are pressed by the water flow, and cannot cross a cofferdam frame 6, so that the fragments are prevented from entering the filter screen and a pit;
fixing holes 5 are uniformly formed in two sides and one end of the bottom of the cofferdam frame 6, the fixing holes 5 are designed at equal intervals, the fixing holes 5 are symmetrically arranged about the vertical center line of the cofferdam frame 6, so that fixing is stable, the cofferdam frame 6 is arranged in front of a pit and a filter screen in a containment, and the cofferdam frame 6 is fixed through the fixing holes 5 by bolts;
the top of upper portion bounding wall 1 one end evenly fixedly connected with bounding wall support 8, and the one end of bounding wall support 8 all with the one end fixed connection at flow channel 3 top, bounding wall support 8 supports flow channel 3, be triangle-shaped design between cofferdam frame 6, bounding wall support 8 and the flow channel 3, support and fix upper portion bounding wall 1, the recirculation rivers carry the piece to flow to cofferdam frame 6, the rivers meet the blocking of upper portion bounding wall 1, change the inflow direction, make a part inflow flow down, a vertical downward force of water flow bottom piece, reduce the possibility that the piece overturns the cofferdam, the piece of rivers lower part gets into the inside of flow channel 3 along with rivers, the clearance outflow entering pit of water flow through filter screen 4, the piece is filtered by passageway 7 and is detained in flow channel 3, filter and collect the piece.
Working principle: firstly, arranging a cofferdam frame 6 in front of a pit and a filter screen in a containment, fixing the cofferdam frame 6 through a fixing hole 5 by using bolts, starting a safety injection system to inject water into a reactor core and the pit if an accident occurs in a nuclear power station, and then starting recirculation, wherein the cofferdam device is submerged by water, and fragments falling off from the containment flow to the cofferdam frame 6 along with recirculating water flow;
secondly, the recirculated water flow carries fragments to the cofferdam frame 6, the water flow encounters the blockage of the upper coaming 1, changes the incoming flow direction, makes a part of the incoming flow downwards, and the fragments at the bottom of the water flow are vertical downwards, so that the possibility that the fragments cross the cofferdam is reduced, the fragments at the lower part of the water flow enter the inside of the flow channel 3 along with the water flow, the water flow flows out through the gaps of the filtering holes 4 to enter the pit, the fragments are filtered by the channel filter screen 7 and are retained in the flow channel 3, and the fragments are filtered and collected;
finally, if the water flow speed is reduced, after the work is finished, the fragments filtered by the channel filter screen 7 in the flow channel 3 can be cleaned, and the cleaned cofferdam frame 6 can recover the circulation speed of the water flow and recover the working performance.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A cofferdam apparatus with debris collection function in a nuclear power plant, comprising: the upper coaming comprises an upper coaming body (1), fixing holes (5) and a cofferdam frame (6), wherein the upper coaming body (1) is fixedly connected to the top end of the cofferdam frame (6), hole spacing frames (2) are uniformly and fixedly connected to the bottom end of the cofferdam frame (6), a flow channel (3) is uniformly and fixedly connected between every two adjacent hole spacing frames (2), fixing holes (5) are uniformly formed in two sides and one end of the bottom of the cofferdam frame (6), a coaming support (8) is uniformly and fixedly connected to the top of one end of the upper coaming body (1), and one end of the coaming support (8) is fixedly connected with one end of the top of the flow channel (3);
the upper coaming (1) is of a solid structure;
the flow channel (3) is of a trapezoidal design, and the flow channel (3) widens along the water flow direction.
2. A cofferdam device with debris collecting function in a nuclear power plant according to claim 1, wherein the inside of the flow channel (3) is provided with a channel filter screen (7), and one end, two sides and the top end of the flow channel (3) are uniformly provided with filter holes (4).
3. A cofferdam apparatus with debris collecting function in a nuclear power plant according to claim 2, wherein the filtering holes (4) are equally spaced on the flow channel (3), and the filtering holes (4) are round holes with a diameter of 1.6 mm.
4. A cofferdam assembly with debris collecting function in a nuclear power plant according to claim 1, characterized in that the upper coaming (1) and the hole spacer (2) are in L-shaped design in side view, supporting the flow channel (3).
5. A cofferdam apparatus with debris collecting function in a nuclear power plant according to claim 1, wherein the bottom end of the flow channel (3) is provided with filtering holes (4).
6. A cofferdam apparatus with debris collecting function in a nuclear power plant according to claim 1, wherein the fixing holes (5) are designed at equal intervals, and the fixing holes (5) are symmetrically arranged with respect to the vertical center line of the cofferdam frame (6).
7. A cofferdam apparatus with debris collecting function in a nuclear power plant as claimed in claim 1, wherein the coaming support (8) supports the flow channel (3), and the cofferdam frame (6), the coaming support (8) and the flow channel (3) are of triangular design.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111215632.6A CN113851243B (en) | 2021-10-19 | 2021-10-19 | Cofferdam device with debris collection function in nuclear power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111215632.6A CN113851243B (en) | 2021-10-19 | 2021-10-19 | Cofferdam device with debris collection function in nuclear power station |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113851243A CN113851243A (en) | 2021-12-28 |
| CN113851243B true CN113851243B (en) | 2024-01-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111215632.6A Active CN113851243B (en) | 2021-10-19 | 2021-10-19 | Cofferdam device with debris collection function in nuclear power station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113851243B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4684496A (en) * | 1984-11-16 | 1987-08-04 | Westinghouse Electric Corp. | Debris trap for a pressurized water nuclear reactor |
| US5390221A (en) * | 1993-08-23 | 1995-02-14 | General Electric Company | Debris filters with flow bypass for boiling water reactors |
| CN101102827A (en) * | 2004-11-15 | 2008-01-09 | 加拿大原子能有限公司 | Colander with rib |
| CN101947397A (en) * | 2010-07-22 | 2011-01-19 | 中科华核电技术研究院有限公司 | Containment sump filter of horizontal pressurized water reactor (PWR) nuclear power plant |
| CN102802758A (en) * | 2009-06-23 | 2012-11-28 | 加拿大原子能有限公司 | Vaned filtering element |
| JP2013156195A (en) * | 2012-01-31 | 2013-08-15 | Mitsubishi Heavy Ind Ltd | Water pit structure for nuclear reactor fuel replacement |
| CN203150148U (en) * | 2013-04-02 | 2013-08-21 | 中广核工程有限公司 | Interception device for fragments of nuclear power station |
| JP2016142687A (en) * | 2015-02-04 | 2016-08-08 | 三菱重工業株式会社 | Nuclear reactor containment structure |
| JP2018205017A (en) * | 2017-05-31 | 2018-12-27 | 三菱重工業株式会社 | Reactor containment structure |
| WO2020237074A2 (en) * | 2019-05-22 | 2020-11-26 | Westinghouse Electric Company Llc | Debris filtering arrangement for nuclear fuel assembly bottom nozzle and bottom nozzle including same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010271149A (en) * | 2009-05-20 | 2010-12-02 | Mitsubishi Heavy Ind Ltd | Reactor containment structure |
| US20110164719A1 (en) * | 2010-01-05 | 2011-07-07 | Westinghouse Electric Company, Llc | Nuclear fuel assembly debris filter bottom nozzle |
| US9997264B2 (en) * | 2012-02-14 | 2018-06-12 | Control Components, Inc. | Enhanced nuclear sump strainer system |
-
2021
- 2021-10-19 CN CN202111215632.6A patent/CN113851243B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4684496A (en) * | 1984-11-16 | 1987-08-04 | Westinghouse Electric Corp. | Debris trap for a pressurized water nuclear reactor |
| US5390221A (en) * | 1993-08-23 | 1995-02-14 | General Electric Company | Debris filters with flow bypass for boiling water reactors |
| CN101102827A (en) * | 2004-11-15 | 2008-01-09 | 加拿大原子能有限公司 | Colander with rib |
| CN102802758A (en) * | 2009-06-23 | 2012-11-28 | 加拿大原子能有限公司 | Vaned filtering element |
| CN101947397A (en) * | 2010-07-22 | 2011-01-19 | 中科华核电技术研究院有限公司 | Containment sump filter of horizontal pressurized water reactor (PWR) nuclear power plant |
| JP2013156195A (en) * | 2012-01-31 | 2013-08-15 | Mitsubishi Heavy Ind Ltd | Water pit structure for nuclear reactor fuel replacement |
| CN203150148U (en) * | 2013-04-02 | 2013-08-21 | 中广核工程有限公司 | Interception device for fragments of nuclear power station |
| JP2016142687A (en) * | 2015-02-04 | 2016-08-08 | 三菱重工業株式会社 | Nuclear reactor containment structure |
| JP2018205017A (en) * | 2017-05-31 | 2018-12-27 | 三菱重工業株式会社 | Reactor containment structure |
| WO2020237074A2 (en) * | 2019-05-22 | 2020-11-26 | Westinghouse Electric Company Llc | Debris filtering arrangement for nuclear fuel assembly bottom nozzle and bottom nozzle including same |
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| Publication number | Publication date |
|---|---|
| CN113851243A (en) | 2021-12-28 |
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Address after: No. 29 Hong Cao Road, Xuhui District, Shanghai Applicant after: Shanghai Nuclear Engineering Research and Design Institute Co.,Ltd. Address before: No. 29 Hong Cao Road, Xuhui District, Shanghai Applicant before: SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE Co.,Ltd. |
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