CN111145928A - Cofferdam device for sealing and isolating nuclear reactor refueling water pool - Google Patents
Cofferdam device for sealing and isolating nuclear reactor refueling water pool Download PDFInfo
- Publication number
- CN111145928A CN111145928A CN201811312615.2A CN201811312615A CN111145928A CN 111145928 A CN111145928 A CN 111145928A CN 201811312615 A CN201811312615 A CN 201811312615A CN 111145928 A CN111145928 A CN 111145928A
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- Prior art keywords
- cofferdam
- breakwater
- water
- water baffle
- nuclear reactor
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 142
- 238000007789 sealing Methods 0.000 title claims abstract description 79
- 239000003758 nuclear fuel Substances 0.000 title claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims abstract description 50
- 238000002955 isolation Methods 0.000 claims abstract description 21
- 239000010935 stainless steel Substances 0.000 claims abstract description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims description 65
- 238000001363 water suppression through gradient tailored excitation Methods 0.000 claims description 15
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 12
- 239000004327 boric acid Substances 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 5
- 230000007704 transition Effects 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000005253 cladding Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Images
Classifications
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- 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
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Gasket Seals (AREA)
Abstract
The invention relates to the technical field of nuclear power station maintenance, and particularly discloses a cofferdam device for sealing and isolating a nuclear reactor refueling water pool. The utility model provides a cofferdam device for sealed isolation of nuclear reactor refueling pond, the device includes cofferdam body, drainage mechanism, inflatable seal structure and pushes down the mechanism, wherein, inflatable seal structure install on the cofferdam body left and right sides and bottom surface to through the mechanism that pushes down that sets up between the sluice gate door body and the cofferdam body, compress tightly the cofferdam body on the stainless steel clad surface in reactor refueling pond. The device ensures the secondary isolation protection of the reactor refueling water pool under the condition that the water pool isolation failure is implemented by the sluice gate during the low water level state of the primary loop of the overhaul unit, thereby ensuring the smooth development of the reactor overhaul work; the device simple structure, processing is convenient, and the practicality is strong.
Description
Technical Field
The invention belongs to the technical field of nuclear power station maintenance, and particularly relates to a cofferdam device for sealing and isolating a nuclear reactor refueling water pool.
Background
The refueling water pool of the M310 pressurized water reactor nuclear power station is divided into a reactor water pool and a component pool, internal components detached from a reactor are stored in the component pool during unit refueling overhaul, and the water pool needs to be filled with boric acid water with a certain height in order to shield the high radioactivity of the internal components. Before a primary circuit of the overhaul unit enters a low water level state, a water gate is arranged in the middle of a refueling pool, and a reactor pool and a component pool are physically isolated, so that unilateral drainage of the reactor pool is realized. The water gate is attached to the working surface of the pool by a single inflatable rubber sealing ring, the range is from the elevation of a refueling pool to +10.8m to +20.00m, the lifting times of the water gate are more, the mounting precision is difficult to control, and the hidden trouble of sealing failure exists. During the low water level state of a primary loop of the overhaul unit, the water gate isolates the water tank, and meanwhile, the overhaul work of the pressure vessel and related equipment is carried out in the water tank of the reactor. When the condition that the water gate is sealed to lose efficacy appears, cause the boric acid water in component pond to leak to the reactor pond of evacuation, will influence the safety of pond bottom operation personnel and equipment, lead to the unable development of reactor maintenance work. If no relevant measures are available, the reactor pool must be refilled with boric acid water, and after the reactor pool is level with the component pool, the water gate with failed seal is lifted out for checking or replacing the seal ring, which will affect the overhaul period of the unit.
The difficulty of sealing and isolating the refueling water tank is mainly reflected in the sealing of the steel cover. Firstly, the steel clad surface of the pool is formed by welding a plurality of stainless steel plates, and a plurality of splicing welding seams penetrate through a sealing surface. And the span of the steel covering surface at the bottom of the water tank is about 6.2 meters, the sealing working surface is very long, the whole body is in a wave fluctuation shape, and the flatness is poor. Moreover, the transition fillets of the steel clad surfaces of the bottom surface and the side surfaces of the water tank are very small, and a common sealing element is difficult to be embedded into the small fillets to realize sealing.
In order to eliminate the influence of the problems on the overhaul period and related overhaul work of the nuclear power plant unit, the cofferdam device for sealing and isolating the nuclear reactor refueling water pool needs to be invented, and the cofferdam device has a secondary isolation protection function on the reactor water pool under the condition that the water gate is subjected to boric acid water isolation failure by considering the sealing requirement of the cofferdam device and the steel covering surface of the water pool.
Disclosure of Invention
The invention aims to provide a cofferdam device for sealing and isolating a nuclear reactor refueling water pool, and solves the technical problems that in the prior art, when the water gate is subjected to water pool isolation failure during the low water level state of a primary loop of a overhaul unit, no secondary isolation device is used for isolating leaked boric acid water, so that the overhaul work of a reactor cannot be carried out, and the overhaul period of the unit is influenced.
The technical scheme of the invention is as follows: the utility model provides a cofferdam device for sealed isolation of nuclear reactor refueling pond, the device includes cofferdam body, drainage mechanism, inflatable seal structure and pushes down the mechanism, wherein, inflatable seal structure install on the cofferdam body left and right sides and bottom surface to through the mechanism that pushes down that sets up between the sluice gate door body and the cofferdam body, compress tightly the cofferdam body on the stainless steel clad surface in reactor refueling pond.
The cofferdam body include left breakwater, right breakwater and middle breakwater, middle breakwater both sides be connected with left breakwater, right breakwater respectively and form the cofferdam body of dull and stereotyped structure left breakwater and right breakwater body side upper end all form convex rectangle clamp plate, its tang overlap joint cooperation with middle breakwater both sides face, after left breakwater, right breakwater are connected with middle breakwater, provide sufficient perpendicular holding down force for middle breakwater through convex rectangle clamp plate on left breakwater, the right breakwater.
The left water baffle, the right water baffle and the middle water baffle are connected through swing bolts in semicircular grooves at respective connecting parts, wherein the swing bolts are fixed on fixing supports of the side walls of the left water baffle and the right water baffle through pin shafts.
The left water baffle and the middle water baffle, and the middle lower part of the middle water baffle connected with the right water baffle are of a concave-convex clamping groove structure, and a rubber pad used for connecting and sealing is arranged in the groove lining.
The left water baffle, the right water baffle and the middle water baffle are provided with contour grooves on the surfaces contacted with the steel cover of the water tank, and the contour grooves are internally provided with inflatable sealing structures.
The inflatable sealing structure comprises a concave sealing ring, a sealing ring pressing plate and a wedge-shaped pad, wherein the section of the concave sealing ring is of a hollow structure, a through air passage is arranged inside the concave sealing ring, and the concave sealing ring is adhered to contour grooves of the left water baffle, the middle water baffle and the right water baffle through glue; the sealing ring pressing plate compresses the two ends of the tail of the concave sealing ring through the fastening piece and fixes the two ends of the tail of the concave sealing ring on the cofferdam body, and a wedge-shaped pad is further installed between the concave sealing ring and the sealing ring pressing plate and used for protecting transition and preventing the concave sealing ring from being torn and damaged after inflation and expansion.
The lower pressing mechanism comprises a lower pressing support and an adjusting mechanism, wherein the side surface of the lower pressing support is positioned on the water gate body, the tail end of the support fixes the lower pressing mechanism on a water gate hook through a positioning shaft, the head end of the lower pressing support is provided with the adjusting mechanism, the adjusting mechanism comprises an upper-section left-hand stud, a lower-section right-hand stud, a cofferdam pressing plate and an adjusting nut, and the upper-section left-hand stud is downward in direction and is welded on the bottom surface of the head of the lower pressing support; the lower section right-handed stud is upwards welded on the top surface of the cofferdam pressing plate, and the upper section left-handed stud and the lower section right-handed stud are connected through an adjusting nut; the cofferdam pressing plate is of a shell structure matched with the top end face of the cofferdam body and is a pressing execution part of the pressing mechanism.
The drainage mechanism is arranged on the left lower side of the cofferdam body and comprises an open-close type quick-change connector and a drainage hose, wherein the open-close type quick-change connector is installed below the left water baffle through threaded connection; the head end of the drainage hose is connected with the open-close type quick-change connector, and the tail end of the drainage hose is arranged in the drainage floor drain of the reactor refueling water pool and used for draining boric acid water accumulated in the cofferdam body.
The lower pressing support is of an integral frame structure or is formed by welding a plurality of hollowed-out plates.
The cofferdam body and/or the pressing mechanism are/is formed by processing antirust aluminum alloy plates.
The invention has the following remarkable effects: the cofferdam device for sealing and isolating the nuclear reactor refueling water pool has the following advantages: (1) under the condition that the sluice gate implements pool isolation failure during the low water level state of a primary loop of the overhaul unit, the secondary isolation protection of a reactor refueling pool is ensured, so that the smooth development of the reactor overhaul work is ensured; (2) the cofferdam body has the assembling and disassembling functions, so that the difficulty of hoisting, transporting and storing is reduced; (3) the inflatable sealing structure and the pressing mechanism form reliable sealing of the stainless steel covering surface of the water tank; (4) the drainage mechanism can automatically drain the boric acid water accumulated in the cofferdam device; (5) the device simple structure, processing is convenient, and the practicality is strong.
Drawings
FIG. 1 is a front view of a cofferdam apparatus for sealing and isolating a refueling pool of a nuclear reactor according to the present invention;
FIG. 2 is a partial perspective view of a cofferdam apparatus for sealing and isolating a refueling water pool of a nuclear reactor according to the present invention;
FIG. 3 is a left side view of a cofferdam apparatus for sealing and isolating a refueling water pool of a nuclear reactor according to the present invention;
FIG. 4 is a schematic structural view of a cofferdam device pressing mechanism for sealing and isolating a nuclear reactor refueling water pool according to the present invention;
FIG. 5 is a schematic structural view of an intermediate water baffle of a cofferdam apparatus for sealing and isolating a refueling water pool of a nuclear reactor according to the present invention;
FIG. 6 is a schematic structural view of water baffles on the left and right sides of a cofferdam device for sealing and isolating a nuclear reactor refueling water pool according to the present invention;
in the figure: 1. a cofferdam body; 2. a left water baffle; 3. a rubber pad; 4. a middle water baffle; 5. a right water baffle; 6. a drainage mechanism; 7. an inflatable seal structure; 8. a pressing mechanism; 9. pressing the bracket downwards; 10. an adjustment mechanism; 11. fixing a bracket; 12. an eye bolt; 13. a pin shaft; 14. a sluice gate hook; 15. positioning the shaft; 16. a water gate body; 17. an upper left-hand stud; 18. adjusting the nut; 19. a right-handed stud at the lower section; 20. cofferdam pressing plate; 21. a seal ring pressing plate; 22. a wedge-shaped pad; 23. a concave sealing ring; 24. an open-close type quick-change connector; 25. a drain hose.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
As shown in fig. 1 to 6, a cofferdam device for sealing and isolating a refueling water pool of a nuclear reactor comprises a cofferdam body 1, a drainage mechanism 6, an inflatable sealing structure 7 and a pressing mechanism 8, wherein the inflatable sealing structure 7 is installed on the left side, the right side and the bottom surface of the cofferdam body 1, and the cofferdam body 1 is pressed on a stainless steel covering surface of the refueling water pool of the reactor through the pressing mechanism 8 arranged between a sluice gate body 16 and the cofferdam body 1; the cofferdam body 1 is also provided with a drainage mechanism 6 for draining boric acid water accumulated in the cofferdam body 1; the cofferdam body 1 and the pressing mechanism 8 are made of antirust aluminum alloy plates, and are not easy to be corroded by boric acid water.
The cofferdam body 1 comprises a left water baffle 2, a right water baffle 5 and a middle water baffle 4 at the two sides, and contour grooves are formed in the surfaces of the left water baffle 2, the right water baffle 5 and the middle water baffle 4, which are in contact with the steel cover surface of the water pool, and are used for installing an inflatable sealing structure 7; the upper ends of the side surfaces of the bodies of the left water baffle 2 and the right water baffle 5 are respectively provided with a convex rectangular pressing plate which is in lap joint with the rabbets on the two side surfaces of the middle water baffle 4, and after the left water baffle 2, the right water baffle 5 and the middle water baffle 4 are connected, the convex rectangular pressing plates on the left water baffle 2 and the right water baffle 5 provide enough vertical downward pressure for the middle water baffle 4; the middle lower part of the left water baffle 2 connected with the middle water baffle 4 and the middle water baffle 4 connected with the right water baffle 5 is of a concave-convex clamping groove structure, and a rubber pad 3 for connecting and sealing is arranged in the inner lining of the groove; the left water baffle 2, the right water baffle 5 and the middle water baffle 4 are connected through swing bolts 12 in semicircular grooves at respective connecting parts, wherein the swing bolts 12 are fixed on a fixing bracket 11 on the side walls of the left water baffle 2 and the right water baffle 5 through pin shafts; and the top parts of the left water baffle 2, the right water baffle 5 and the middle water baffle 4 are also provided with lug holes for integral hoisting.
The inflatable sealing structure 7 comprises a concave sealing ring 23, a sealing ring pressing plate 21 and a wedge-shaped pad 22, wherein the section of the concave sealing ring 23 is of a hollow structure, a through air passage is arranged inside the concave sealing ring, and the concave sealing ring is adhered to contour grooves of the left water baffle 2, the middle water baffle 4 and the right water baffle 5 through adhesive; the sealing ring pressing plate 21 compresses the two ends of the tail of the concave sealing ring 23 through a fastener and fixes the two ends of the tail of the concave sealing ring 23 on the cofferdam body 1, and a wedge-shaped pad is further installed between the concave sealing ring 23 and the sealing ring pressing plate 21 and used for protecting transition and preventing the concave sealing ring 23 from being torn and damaged after inflation and expansion.
The pressing mechanism 8 comprises a pressing support 9 and an adjusting mechanism 10, wherein the pressing support 9 is of an integral frame structure or is formed by welding a plurality of hollowed-out plates, so that the mechanical strength of the support is ensured, and the weight of the support is reduced; the side surface of the lower pressing support 9 is positioned on the water gate body 16, the tail end of the support fixes the lower pressing mechanism 8 on a water gate hook 14 through a positioning shaft 15, the head end of the lower pressing support 9 is provided with an adjusting mechanism 10, the adjusting mechanism 10 comprises an upper-section left-hand stud 17, a lower-section right-hand stud 19, a cofferdam pressing plate 20 and an adjusting nut 18, wherein the upper-section left-hand stud 17 faces downwards and is welded on the bottom surface of the head part of the lower pressing support 9; the lower section right-handed stud 19 is upwards welded on the top surface of the cofferdam pressing plate 20, and the upper section left-handed stud 17 is connected with the lower section right-handed stud 19 through an adjusting nut 18; the cofferdam pressing plate 20 is a shell structure matched with the top end face of the cofferdam body 1 and is a pressing execution part of the pressing mechanism 8.
A drainage mechanism 6 is installed at the lower left of the cofferdam body 1, the drainage mechanism 6 comprises an open-close type quick-change connector 24 and a drainage hose 25, wherein the open-close type quick-change connector 24 is installed below the left water baffle 2 through threaded connection; the head end of the drainage hose 25 is connected with the open-close type quick-change connector 24, and the tail end of the drainage hose 25 is arranged in the drainage floor drain of the reactor refueling water pool and is used for draining boric acid water accumulated in the cofferdam body 1.
The cofferdam device for sealing and isolating the nuclear reactor refueling water pool has the specific working process that: the cofferdam body 1 and the accessories are transported to a +20M platform of a nuclear island plant, and a left water baffle 2, a middle water baffle 4 and a right water baffle 5 are assembled on the +20M platform of the nuclear island plant and are connected into a whole by fasteners. The concave sealing rings 23 are arranged in the contour grooves on the two sides and the bottom surface of the cofferdam body 1 by special adhesive. The female seal ring 23 is fixed to the cofferdam body 1 by the fastening member, the seal ring pressing plate 21 and the wedge pad 22. Lifting lugs are arranged in the preformed holes at the tops of the left water baffle 2 and the right water baffle 5. And hoisting the cofferdam body 1 to the installation position at the bottom of the reactor pool by using a ring crane. Leveling the cofferdam body 1, and installing a pressing mechanism 8 to position and fix the cofferdam body. And connecting an air source to pressurize the concave sealing ring 23. And adjusting nuts 18 of the two pressing mechanisms 8 synchronously, so that the cofferdam pressing plate 20 presses the pressurized cofferdam device until the sealing with the stainless steel covering surface is good. And installing a drainage mechanism 6, and placing an outlet of the drainage hose 25 in a drainage floor drain of a reactor refueling water tank.
Through the application of the technical equipment, under the condition that the water tank isolation failure is implemented by the sluice gate during the low water level state of the primary loop of the overhaul unit, the secondary isolation protection of the reactor refueling water tank is ensured, so that the smooth development of the reactor overhaul work is ensured. The combined cofferdam body 1 realizes the assembling and disassembling functions and reduces the difficulty of hoisting, transporting and storing. The inflatable sealing structure 7 and the pressing mechanism 8 form reliable sealing of the stainless steel cladding of the water pool. The drainage mechanism 6 realizes automatic drainage of boric acid water accumulated in the cofferdam device.
Claims (10)
1. A cofferdam device for sealing and isolating a nuclear reactor refueling water pool is characterized in that: the device comprises a cofferdam body (1), a drainage mechanism (6), an inflatable sealing structure (7) and a pressing mechanism (8), wherein the inflatable sealing structure (7) is arranged on the left side, the right side and the bottom surface of the cofferdam body (1), and the cofferdam body (1) is pressed on a stainless steel covering surface of a reactor refueling water pool through the pressing mechanism (8) arranged between a sluice gate body (16) and the cofferdam body (1).
2. The cofferdam device for the sealed isolation of the refueling water pool of the nuclear reactor as claimed in claim 1, wherein: cofferdam body (1) include left breakwater (2), right breakwater (5) and middle breakwater (4), middle breakwater (4) both sides be connected with left breakwater (2), right breakwater (5) respectively and form cofferdam body (1) of flat structure left breakwater (2) and right breakwater (5) body side upper end all form convex rectangle clamp plate, its tang overlap joint cooperation with middle breakwater (4) both sides face, be connected the back at left breakwater (2), right breakwater (5) and middle breakwater (4), provide sufficient perpendicular holding down force for middle breakwater (4) through convex rectangle clamp plate on left breakwater (2), the right breakwater (5).
3. The cofferdam device for the sealed isolation of the refueling water pool of the nuclear reactor as claimed in claim 2, wherein: the left water baffle (2), the right water baffle (5) and the middle water baffle (4) are connected through swing bolts (12) in semicircular grooves at respective connecting parts, wherein the swing bolts (12) are fixed on fixing supports (11) on the side walls of the left water baffle (2) and the right water baffle (5) through pin shafts.
4. The cofferdam device for the sealed isolation of the refueling water pool of the nuclear reactor as claimed in claim 2, wherein: the middle lower part of the left water baffle (2) and the middle water baffle (4) and the middle lower part of the middle water baffle (4) and the right water baffle (5) are connected is of a concave-convex clamping groove structure, and a rubber pad (3) for connecting and sealing is arranged in the groove lining.
5. The cofferdam device for the sealed isolation of the refueling water pool of the nuclear reactor as claimed in any one of claims 2 to 4, wherein: and contour grooves are formed in the surfaces of the left water baffle (2), the right water baffle (5) and the middle water baffle (4) which are contacted with the steel cover surface of the water tank, and an inflatable sealing structure (7) is arranged in the contour grooves.
6. The cofferdam device for the sealed isolation of the refueling water pool of the nuclear reactor as claimed in claim 5, wherein: the inflatable sealing structure (7) comprises a concave sealing ring (23), a sealing ring pressing plate (21) and a wedge-shaped pad (22), wherein the section of the concave sealing ring (23) is of a hollow structure, a through air passage is arranged inside the concave sealing ring, and the concave sealing ring is adhered to contour grooves of the left water baffle (2), the middle water baffle (4) and the right water baffle (5) through adhesive; the sealing ring pressing plate (21) compresses the two ends of the tail of the concave sealing ring (23) through a fastener and fixes the two ends of the tail of the concave sealing ring on the cofferdam body (1), and a wedge-shaped pad is further installed between the concave sealing ring (23) and the sealing ring pressing plate (21) and used for protecting transition and preventing the concave sealing ring (23) from being torn and damaged after inflation and expansion.
7. The cofferdam device for the sealed isolation of the refueling water pool of the nuclear reactor as claimed in claim 1, wherein: the pressing mechanism (8) comprises a pressing support (9) and an adjusting mechanism (10), wherein the side face of the pressing support (9) is positioned on the water gate body (16), the pressing mechanism (8) is fixed on a water gate hook (14) through a positioning shaft (15) at the tail end of the support, the adjusting mechanism (10) is arranged at the head end of the pressing support (9), the adjusting mechanism (10) comprises an upper-section left-handed stud (17), a lower-section right-handed stud (19), a cofferdam pressing plate (20) and an adjusting nut (18), the upper-section left-handed stud (17) is downward in direction and is welded on the bottom face of the head of the pressing support (9); the lower section right-hand stud (19) is upwards welded on the top surface of the cofferdam pressing plate (20), and the upper section left-hand stud (17) is connected with the lower section right-hand stud (19) through an adjusting nut (18); the cofferdam pressing plate (20) is a shell structure matched with the top end face of the cofferdam body (1) and is a pressing execution part of the pressing mechanism (8).
8. The cofferdam device for the sealed isolation of the refueling water pool of the nuclear reactor as claimed in claim 1, wherein: the cofferdam comprises a cofferdam body (1), and is characterized in that a drainage mechanism (6) is further arranged on the left lower side of the cofferdam body (1), the drainage mechanism (6) comprises an open-close type quick-change connector (24) and a drainage hose (25), wherein the open-close type quick-change connector (24) is installed below a left water baffle (2) through threaded connection; the head end of the drainage hose (25) is connected with the open-close type quick-change connector (24), and the tail end of the drainage hose (25) is arranged in the drainage floor drain of the reactor refueling water pool and is used for draining boric acid water accumulated in the cofferdam body (1).
9. The cofferdam device for the sealed isolation of the refueling water pool of the nuclear reactor as claimed in claim 7, wherein: the pressing support (9) is of an integral frame structure or is formed by welding a plurality of hollowed-out plates.
10. The cofferdam device for the sealed isolation of the refueling water pool of the nuclear reactor as claimed in claim 1, wherein: the cofferdam body (1) and/or the pressing mechanism (8) are/is formed by processing antirust aluminum alloy plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811312615.2A CN111145928A (en) | 2018-11-06 | 2018-11-06 | Cofferdam device for sealing and isolating nuclear reactor refueling water pool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811312615.2A CN111145928A (en) | 2018-11-06 | 2018-11-06 | Cofferdam device for sealing and isolating nuclear reactor refueling water pool |
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| Publication Number | Publication Date |
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| CN111145928A true CN111145928A (en) | 2020-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811312615.2A Pending CN111145928A (en) | 2018-11-06 | 2018-11-06 | Cofferdam device for sealing and isolating nuclear reactor refueling water pool |
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