CN118223724A - Anti-leakage pool and manufacturing method thereof - Google Patents

Abstract

The wall body is formed by welding metal plates in a butt-joint mode, a leakage detection groove is formed in the back side of a welding line of the butt-joint welding mode, a plurality of leakage detection grooves are communicated to form a leakage detection pipeline, a waste liquid outlet is formed in the lowest position of the leakage detection pipeline, and the leakage detection pipeline is configured to be of a closed airtight structure except the waste liquid outlet. The anti-leakage pool can be used for rapidly positioning the position of a welding seam where leakage occurs by using methods such as helium leakage detection or airtight test, so that the safety of the pool of the nuclear power station is effectively improved, and the accident risk is reduced. The invention also provides a manufacturing method of the leakage-proof water pool.

Description

Anti-leakage pool and manufacturing method thereof

Technical Field

The invention belongs to the field of nuclear power, and particularly relates to an anti-seepage pool and a manufacturing method thereof.

Background

A variety of different large pool structures are provided in nuclear power plants, such as spent fuel storage pools, refueling pools, and refueling water storage pools, wherein the contents of many pools are radioactive and can cause safety accidents once leakage occurs. Typically, to avoid contamination of the tank contents and to avoid leakage of the tank, these tanks use stainless steel as the tank wall, the steel plating forming the sealing boundary of the tank and concrete or reinforced concrete as the tank support structure. The surface area of the pool is large, the total length of the spliced weld seam of the stainless steel wall surface reaches hundreds of meters or even thousands of meters, so that welding defects are difficult to avoid in the welding process, and the edges, the crossing parts of the weld seam and the like can be cracked in the construction and service processes due to stress or corrosion factors, so that the risk of radioactive pollution leakage is generated. In order to timely find out the leakage of the water tank and collect and treat the leakage water, a leakage detection groove is usually arranged on the back side of the steel coating surface of the water tank, and the leakage water is detected and recovered through the leakage detection groove. However, the leak detection groove can only detect leakage through the waste liquid monitoring main pipe arranged at the final collecting position, and can not accurately position the leakage position, and for fine leakage points, the seepage detection PT or vacuum box test is difficult to find and position defects; the leak detection groove itself has no sealing property, and the technical means such as helium leak detection with high precision, airtight test and the like cannot be applied. Therefore, the anti-seepage pool capable of rapidly positioning the seepage points has positive significance for improving the operation safety of the nuclear power station.

Disclosure of Invention

The invention aims to provide an anti-leakage water pool which can be used for rapidly detecting and positioning leakage points. The invention also provides a manufacturing method of the leakage-proof water pool.

According to an embodiment of one aspect of the present invention, there is provided a leakage-proof pool, including a wall body, the wall body is formed by welding a plurality of metal plates, and a leakage detection groove is provided on a back side of a welding seam between the plurality of metal plates. The leakage detection grooves are communicated to form leakage detection pipelines, waste liquid outlets are arranged at the lowest positions of the leakage detection pipelines, and the leakage detection pipelines are configured to be of a closed airtight structure except the waste liquid outlets.

The leak detection pipeline is arranged to be of a closed airtight structure, so that the leakage position can be rapidly positioned by helium leak detection through introducing helium gas into the position of the waste liquid outlet. When water stored in the water tank cannot be emptied immediately, the air tightness of the leakage detection pipeline can be utilized, compressed air is filled in the leakage detection pipeline, and the leakage position is positioned by detecting the generation condition of air bubbles in the water tank.

Further, in some embodiments, the wall body includes a wall plate and a sealing plate, the wall plate includes a plane portion and a flange portion, the flange portion protrudes to the outside of the anti-leakage pool, adjacent wall plates in the same wall surface are welded together through the flange portion, and a space exists between edges of the plane portion; the sealing plates are filled in the spaces and are respectively welded with the plane parts of the adjacent wall plates; the flange portions of adjacent ones of the wall panels and the closure plate cooperate to define the leak detection groove. The leak detection groove formed by the edge folding part and the sealing plate can be manufactured by completely welding and processing the inner side of the wall body of the water tank, and simultaneously, the total length of a welding seam exposed on the outer side of the wall body is reduced, so that the anti-leakage capacity of the water tank is improved, and the air tightness of a leak detection pipeline is improved.

Further, in some embodiments, the hemming portion is configured as a flat plate structure disposed obliquely with respect to the planar portion.

Further, in some embodiments, the leakage detection groove further includes an angle leakage detection groove, where the angle leakage detection groove is disposed at a corner position where adjacent wall surfaces are connected, the angle leakage detection groove is defined by wall plates respectively disposed on the adjacent wall surfaces and angle sealing plates, the wall plates of the adjacent wall surfaces are welded together, and the angle sealing plates are welded together with the wall plates of the adjacent wall surfaces respectively.

According to an embodiment of another aspect of the present invention, there is provided a method of manufacturing a leakage preventing sump, the method including the steps of: providing a plurality of raw material stainless steel plates, performing splice welding on the raw material stainless steel plates to form a pool wall body, arranging leak detection grooves at welding seam positions of the splice welding of the raw material stainless steel plates, enabling the leak detection grooves to be communicated into leak detection pipelines, arranging a waste liquid outlet at the lowest position of the leak detection pipelines, and configuring the leak detection pipelines into a closed airtight structure except the waste liquid outlet to obtain a pool prefabricated member; and hoisting the pool prefabricated member to a given position, and pouring concrete outside the pool prefabricated member to obtain the anti-seepage pool. The method forms the leakage detection pipeline by welding from the outer side in a mode of prefabricated pool prefabricated bodies, and is convenient for checking and repairing the air tightness of the leakage detection pipeline.

Further, in some embodiments, the method for setting the leak detection groove includes welding a channel steel or an angle steel outside a welding seam position of the raw material stainless steel plate in a butt welding manner, so that the channel steel or the angle steel and the raw material stainless steel plate together define the leak detection groove.

According to an embodiment of a further aspect of the present invention, there is provided a method of manufacturing a leakage-preventing sump, the method comprising the steps of: providing a support structure of the leakage prevention water tank at a given position, and arranging a groove on the support structure, wherein the groove provides an installation space of the leakage detection groove; providing a raw material stainless steel plate, wherein the raw material stainless steel plate comprises a wall plate and a sealing plate, the wall plate comprises a plane part and a folded part, the folded part protrudes relative to the plane part, and the sealing plate is configured as a plate piece; hoisting the wall plate to the surface of the supporting structure, attaching the plane part to the surface of the supporting structure, extending the edge folding part into the groove, and welding and connecting the edge folding parts of the adjacent wall plates together; filling the sealing plates between the plane parts of the adjacent wall plates, and welding the sealing plates with the plane parts together to enable the sealing plates and the edge folding parts to jointly define the leakage detection grooves, wherein a plurality of the leakage detection grooves are communicated to form leakage detection pipelines, the leakage detection pipelines are provided with waste liquid outlets at the lowest positions, and the leakage detection pipelines are configured to be of a closed airtight structure except the waste liquid outlets, so that an anti-leakage water pool is obtained.

Drawings

FIG. 1 is a schematic view of an embodiment of a leak-proof pool;

FIG. 2 is a schematic diagram of a leak detection tank in one embodiment;

FIG. 3 is a schematic diagram of an embodiment of an angular leak detection tank;

FIG. 4 is a schematic diagram of an alternative embodiment of an angular leak detection tank configuration;

FIG. 5 is a schematic view of a leak-proof pool structure in yet another embodiment;

fig. 6 is a schematic diagram of a nuclear power plant pool structure in a comparative example.

The above drawings are provided for the purpose of explaining the present invention in detail so that those skilled in the art can understand the technical concept of the present invention, and are not intended to limit the present invention. For simplicity of illustration, the above figures show only schematically the structures related to the technical features of the present invention, and not all the details and the complete structures are drawn strictly to the actual scale.

Detailed Description

The invention will now be described in further detail with reference to the accompanying drawings by means of specific examples.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment herein. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments limited to the same embodiment. Those skilled in the art will appreciate that embodiments herein may be combined with other embodiments without structural conflict.

In the description herein, unless explicitly specified and limited otherwise, the technical terms "mounted," "connected," and the like are to be construed broadly and as such, the specific meaning of the terms in embodiments of the application will be understood by those of ordinary skill in the art in view of the specific circumstances.

In the description herein, terms such as "upper," "lower," "left," "right," "transverse," "longitudinal," "height," "length," "width," and the like that indicate an azimuth or positional relationship are intended to accurately describe the embodiments and simplify the description, and do not limit the details or structures involved to having to have a particular azimuth, mount or operate in a particular azimuth, and are not to be construed as limiting embodiments herein.

In the description herein, the terms "first," "second," and the like are used merely to distinguish between different objects and should not be construed as indicating relative importance or defining the number, particular order, or primary and secondary relationships of the technical features described. In the description herein, the meaning of "plurality" is at least two.

At present, as shown in fig. 6, a large-scale pool structure in a nuclear power station is generally shown, a stainless steel wall surface 2 is used for isolating radioactive contents in the pool, and reinforced concrete or concrete is used as a supporting structure 1 on the outer side. The stainless steel wall surface 2 is used as a sealing boundary of the pool, and the wall surface is required to leak radioactive substances to cause pollution. However, the pool in the nuclear power station is large in volume, the surface area of the stainless steel wall surface 2 is large, the length of the welding seam of the stainless steel plate is hundreds of meters or even thousands of meters, and leakage points caused by welding defects are difficult to stop only by a quality control means. Therefore, the back side of the welding seam of the stainless steel wall surface 2 is provided with a leakage detection groove 3 for collecting, detecting and recovering leaked radioactive sewage. However, the leakage detection is usually performed at the joint of the leakage detecting groove 3, and only whether leakage occurs or not can be detected, so that the specific position of the welding seam where the leakage occurs cannot be positioned. However, since the leak detection groove wall 5 forming the leak detection groove 3 is usually embedded in the concrete supporting structure 1 in advance, once the stainless steel wall surface 2 is laid, the leak detection groove wall 5 cannot be welded, so that the leak detection groove wall 5 can only be welded with the stainless steel wall surface 2 on one side at most, and closed connection cannot be realized, the leak detection groove 3 is not airtight, and therefore, the leak position cannot be positioned by accurate means such as helium leak detection, so that the pool is difficult to overhaul.

In order to solve the above problems, an embodiment of an aspect of the present invention provides a leakage preventing sink having a structure as shown in fig. 1. The pool comprises a stainless steel wall surface 2 surrounded by stainless steel plates, a concrete supporting structure 1 is arranged on the outer side of the stainless steel wall surface 2, a leak detection groove 3 protruding outwards is arranged at the position of a splicing welding seam of the stainless steel wall surface 2, one or more leak detection pipelines are formed by communicating the leak detection grooves 3, a waste liquid outlet is arranged at the lowest position of the pool in the leak detection pipeline, and the whole leak detection pipeline is of an airtight structure except the waste liquid outlet. Therefore, helium leakage detection can be performed on the surface of the welding seam of the stainless steel wall surface 2 by filling helium gas at the waste liquid outlet, and the leakage occurrence position can be quickly and effectively positioned. When the water stored in the water tank can not be emptied temporarily, the leakage detection can be performed through an airtight test in a mode that the waste liquid outlet is filled with pressure gas.

In a preferred embodiment, leak detection tank 3 is configured as shown in FIG. 2. The stainless steel wall surface 2 comprises a plurality of wall plates 20 and a sealing plate 4. The wall plate 20 comprises a plane part 21 and a folded part 22, and the folded part 22 protrudes to the outer side of the pool. In the same wall surface, the folded edge parts 22 of the adjacent wall plates 20 are welded together through a welding seam 31; after the edge folding parts are spliced and welded, gaps exist between the plane parts 21, and the sealing plate 4 is filled in the gaps and is welded and connected with the plane parts on two sides through welding seams 32. Thus, the leak detection groove 3 is defined by the flange portion 22 and the seal plate 4.

The hemming portion 22 is provided in a flat plate structure inclined with respect to the flat plate portion 21 so as to facilitate the lifting and splicing of the wall plate. In other embodiments, the hemming portion 22 may be configured in a stepped shape.

In a preferred embodiment, the anti-leakage pool further comprises an angle leakage detection groove, the angle leakage detection groove is formed by enclosing a wall plate 20 at the corner of the pool, a planar stainless steel plate 23 and an angle sealing plate 41 together in a pair by pair in a butt welding mode, wherein the planar steel plate 23 is welded with a flanging part 22 of the wall plate 20, and the angle sealing plate 41 is vertically connected with the planar steel plate 23. In other embodiments, the angle leakage detection groove can also adopt a structure as shown in fig. 4, and the angle leakage detection groove is formed by jointly enclosing two planar steel plates 23 at corners and an angle sealing plate 41 in a butt welding mode, wherein the angle sealing plate 41 and the two planar steel plates 23 are respectively connected at 45 degrees.

In one embodiment, a leak-proof pond as shown in fig. 1-3 may be manufactured by:

firstly, building a concrete or reinforced concrete supporting structure at the building position of a pool, and arranging a groove on the supporting structure to provide a space for the formation of the leakage detection groove 3.

Next, the panels 20 are lifted onto the inner surface of the support structure to be laid and spliced, so that the flange portions 22 of the adjacent panels 20 are spliced together in the manner shown in fig. 2, and welded to form the weld 31. Then, the V-shaped groove body formed by the flange parts 22 is covered with the sealing plate 4, the sealing plate 4 and the plane parts 21 of the two side wall plates 20 are respectively welded together to form a welding seam 32, and the sealing plate 4 and the flange parts 22 on the two sides jointly enclose a leakage detection groove. At the corner locations, the corner leak detection groove structure shown in fig. 3 can be welded in the same way.

Through carrying out reasonable setting to weld seam position and trend, can make the leak hunting groove intercommunication in the pond outside form one or more leak hunting pipelines to form the waste liquid export in the lowest position of pond bottom, the waste water that makes any weld seam position leak in the leak hunting pipeline can collect to the waste liquid export along the leak hunting pipeline. Because each part surrounding the leak detection groove 3 is connected together in a splice welding mode through welding processing performed on the inner side of the water tank, a sealed airtight structure can be formed outside a waste liquid outlet at the leak detection pipeline, and therefore the water tank can rapidly position a leakage position in a helium leak detection mode or an airtight test mode.

In another embodiment, for relatively small tanks, as shown in FIG. 5, the fabrication of the leak-tight tank may be accomplished by using a process for fabricating a tank preform. In the manufacturing process, firstly, a flat plate raw material stainless steel plate is hoisted and welded into a stainless steel wall surface 2 of a pool in a splicing way, then a channel steel 51 is welded on the outer side of a plane welding line of the stainless steel wall surface 2, and an angle steel 52 is welded on the outer side of a welding line at a corner position to form a leakage detection groove, so that a pool preform is obtained. Through carrying out reasonable setting to weld seam position and trend, can make the leak hunting groove intercommunication in the pond outside form one or more leak hunting pipelines, leak hunting pipeline is provided with the waste liquid export in pond prefabrication body bottom lowest department, makes the waste water that any weld seam position was leaked in the leak hunting pipeline can collect to the waste liquid export along leak hunting pipeline. Since the leak detection groove is welded and fixed by the channel steel 51 or the angle steel 52 from the outer side of the stainless steel wall surface 2, the leak detection groove can be formed to have a closed airtight structure as well. After the splice welding of the pool prefabricated body is completed, the pool prefabricated body is integrally hoisted to a preset installation position, and then concrete is directly poured outside the pool prefabricated body, so that the manufacturing of the leakage-proof pool is completed.

In other embodiments, the on-site tailor-welding and the method of manufacturing the prefabricated body can be combined, a plurality of prefabricated bodies with larger volumes of wall surfaces are prefabricated, and then the prefabricated bodies are hoisted to a preset installation position to complete the assembly of the tailor-welding.

In other embodiments, the method for manufacturing the anti-seepage pool provided by the embodiment is also suitable for manufacturing large-scale reservoir outside the nuclear power station, such as building large-scale reservoir facilities with seepage risks in industrial application scenes of petroleum, chemical industry, pharmacy, mining and the like.

The above-described embodiments are intended to explain the present invention in further detail with reference to the figures so that those skilled in the art can understand the technical concept of the present invention. Within the scope of the present disclosure, the structural and equivalent substitutions of the parts or method steps involved, and the combination of the implementation manners of the different embodiments without structural and principle conflicts, all fall within the scope of the present disclosure.

Claims (7)

1. The utility model provides an antiseep pond, includes the wall, the wall is formed by the concatenation of polylith metal sheet, concatenation welding seam dorsal part between the polylith metal sheet is provided with leak hunting groove, its characterized in that, a plurality of leak hunting groove intercommunication becomes leak hunting pipeline, leak hunting pipeline is provided with the waste liquid export in the minimum position, except the waste liquid export, leak hunting pipeline is configured to seal airtight structure.

2. The leakage-proof pool of claim 1, wherein the wall comprises a wall plate and a sealing plate, the wall plate comprises a plane part and a folded edge part, the folded edge part protrudes to the outer side of the leakage-proof pool, adjacent wall plates in the same wall surface are welded together through the folded edge part, and a space exists between the edges of the plane part; the sealing plates are filled in the spaces and are respectively welded with the plane parts of the adjacent wall plates; the flange portions of adjacent ones of the wall panels and the closure plate cooperate to define the leak detection groove.

3. The leakage prevention sink of claim 2, wherein said flange portion is configured as a flat plate structure disposed obliquely with respect to said planar portion.

4. A pool as claimed in claim 1 or claim 2, wherein the leak detection grooves further comprise corner leak detection grooves provided at corner locations where adjacent walls are joined, + the corner leak detection grooves being defined by wall panels provided respectively at the adjacent walls together with corner seal plates welded together, the corner seal plates being welded together respectively with the wall panels of the adjacent walls.

5. A method of manufacturing a leak-proof pond, comprising the steps of:

providing a plurality of raw material stainless steel plates, performing splice welding on the raw material stainless steel plates to form a pool wall body, arranging leak detection grooves at welding seam positions of the splice welding of the raw material stainless steel plates, enabling the leak detection grooves to be communicated into leak detection pipelines, arranging a waste liquid outlet at the lowest position of the leak detection pipelines, and configuring the leak detection pipelines into a closed airtight structure except the waste liquid outlet to obtain a pool prefabricated member;

And hoisting the pool prefabricated member to a given position, and pouring concrete outside the pool prefabricated member to obtain the anti-seepage pool.

6. The method of manufacturing a leakage prevention sink according to claim 5, wherein the leak detection groove is formed by welding a channel steel or angle steel outside a welded seam position of the raw material stainless steel plate, so that the channel steel or angle steel and the raw material stainless steel plate together define the leak detection groove.

7. A method of manufacturing a leak-proof pond, comprising the steps of:

providing a support structure of the leakage prevention water tank at a given position, and arranging a groove on the support structure, wherein the groove provides an installation space of the leakage detection groove;

Providing a raw material stainless steel plate, wherein the raw material stainless steel plate comprises a wall plate and a sealing plate, the wall plate comprises a plane part and a folded part, the folded part protrudes relative to the plane part, and the sealing plate is configured as a plate piece;

hoisting the wall plate to the surface of the supporting structure, attaching the plane part to the surface of the supporting structure, extending the edge folding part into the groove, and welding and connecting the edge folding parts of the adjacent wall plates together;

Filling the sealing plate between the plane parts of the adjacent wall plates, and welding the sealing plate and the plane parts together so that the sealing plate and the flanging parts jointly define the leakage detection groove;

The leakage detection tanks are communicated to form a leakage detection pipeline, a waste liquid outlet is arranged at the lowest position of the leakage detection pipeline, and the leakage detection pipeline is configured to be of a closed airtight structure except for the waste liquid outlet, so that a leakage prevention water pool is obtained.