CN216084339U - Foreign matter prevention device for nuclear power station upper reactor internals storage area - Google Patents
Foreign matter prevention device for nuclear power station upper reactor internals storage area Download PDFInfo
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- CN216084339U CN216084339U CN202121972451.3U CN202121972451U CN216084339U CN 216084339 U CN216084339 U CN 216084339U CN 202121972451 U CN202121972451 U CN 202121972451U CN 216084339 U CN216084339 U CN 216084339U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The utility model discloses a foreign matter prevention device for an upper reactor internals storage area of a nuclear power station, which comprises longitudinal beam components, support components, cross beam components, protection components and connecting components, wherein the longitudinal beam components are respectively and fixedly connected to different guardrails of a reactor internals lifting tool platform, the top of each support component is provided with a hole structure, the longitudinal beam components are movably connected with the hole structures of the support components, the bottom of each support component is supported on the upper end surface of the reactor internals lifting tool platform, the upper end of each longitudinal beam component is provided with the cross beam component, the cross beam components and the longitudinal beam components are sequentially connected to form a well-shaped structure, one end of each protection component is connected to the end of each cross beam component, and the other end of each protection component is unfolded from outside to inside and is fixed in the middle of each cross beam component through the connecting components. The advantages are that: the manual accessibility is realized, the installation difficulty is reduced, the risk of the operation of the reactor refueling water tank is reduced as much as possible, and the safety of implementing foreign matter prevention measures is ensured; the utility model has simple structure, convenient processing and strong practicability.
Description
Technical Field
The utility model belongs to the field of maintenance of upper reactor internals of nuclear power plants, and particularly relates to a foreign matter prevention device for a storage area of the upper reactor internals of the nuclear power plants.
Background
During the maintenance activities of the nuclear power station, when the opening system and the equipment are checked, tested, maintained and the like, foreign matters can enter a system loop due to improper protection measures, and when the system or the equipment is put into operation, the equipment is damaged, a unit stops and stops, and even a nuclear safety accident can be caused in serious conditions. In a nuclear power unit in construction and in service, the event that external foreign matters invade the interior of a nuclear reactor is continuously generated due to insufficient protection measures, and partial correction measures are only limited to removing the foreign matters but not preventing the foreign matters. In order to improve the safety and reliability of the system and equipment of the nuclear power plant, promote the nuclear safety, protect the integrity of the fuel assembly and the generating capacity of the unit, the system and the equipment are checked during the unit refueling overhaul period, foreign matters are removed, active and active foreign matter prevention measures are required to be taken, and the generation of foreign matter events is effectively reduced.
During the period of the pressurized water reactor nuclear power station refueling overhaul, the top cover of the reactor pressure vessel needs to be opened to carry out refueling and inspection and maintenance work of the reactor internals. The upper supporting component of the upper reactor internals is formed by welding an upper supporting flange, a skirt cylinder and an upper supporting plate to form a bowl-shaped chamber structure with an upward opening, and the cleanliness control and the foreign matter protection of the interior of the bowl-shaped chamber structure are particularly critical. Before reactor unloading, the internal components at the upper part are disassembled from the reactor by using the internal component lifting appliance and lifted to the storage rack of the internal component storage water pool, so that the reactor core can carry out the work of in-service inspection of a pressure vessel, inspection and maintenance of the internal components at the lower part, and the like. Due to the particularity of nuclear technology, reactor components of in-service nuclear power units have high radioactivity, and in order to shield the high radioactivity of upper internals, a certain height of boric acid water needs to be filled in a storage water tank of the internals.
The upper part of the reactor internals is in an exposed state under boric acid water in the reactor internals storage pool, and no foreign matter prevention measure is arranged above the upper part of the reactor internals storage pool. Since other maintenance and hoisting work needs to be performed around the storage area of the upper internals, tools, equipment parts and the like used in the process may cause foreign matters to fall into the upper internals, and cause equipment failure related to the foreign matters.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a foreign matter prevention device for an upper reactor internals storage area of a nuclear power station, which can effectively solve the problem that the fault of foreign matter related equipment is caused because external foreign matters can not be prevented from falling in the storage process of an upper reactor internals hanging away from a reactor core in a reactor internals storage pool during the overhaul period of the conventional pressurized water reactor nuclear power station; by adopting active and active foreign matter prevention measures, the generation of foreign matter events is effectively reduced, and the safety and the reliability of the equipment are improved.
The technical scheme of the utility model is as follows: the utility model provides a nuclear power station upper portion is piled interior member and is deposited district and prevent foreign matter device, including longeron subassembly, supporting component, crossbeam subassembly, protection component and coupling assembling, longeron subassembly fixed connection respectively on the different guardrail of internal member hoist platform, supporting component's top is equipped with the hole structure, longeron subassembly and supporting component's hole structure swing joint, the supporting component bottom sprag is at internal member hoist platform up end piling, the upper end of longeron subassembly is equipped with crossbeam subassembly, crossbeam subassembly connects gradually with the longeron subassembly and forms well style of calligraphy structure, the tip at crossbeam subassembly is connected to protection component's one end, protection component's other end outside-in expandes through coupling assembling fixes the middle part at crossbeam subassembly.
The longitudinal beam assembly comprises a first longitudinal beam, a second longitudinal beam, a fixing assembly and hinge clamps, the first longitudinal beam and the second longitudinal beam are respectively sleeved into the hole structures of the supporting assemblies from the left side and the right side to form T-shaped structures, and the hinge clamps are respectively welded on the upper end surfaces of the first longitudinal beam and the second longitudinal beam.
The longitudinal beam assemblies are divided into two groups.
The first longitudinal beam and the second longitudinal beam are both of hollow structures, and the sizes of the first longitudinal beam and the second longitudinal beam are matched with the size of the hole structure of the supporting component.
The hinge card is of a concave structure.
The fixing assembly comprises a hoop, a connecting plate and a square block, the first longitudinal beam and the second longitudinal beam are movably connected with the square block respectively, the upper end face and the lower end face of the connecting plate are welded with the top of the hoop and the bottom of the square block respectively, and the hoop and the square block are coaxially arranged.
The fixing components are four groups in total.
The middle of the hoop is of a round hole structure, and the inner diameter of the round hole is matched with the diameter of a platform guardrail of the lifting appliance of the reactor internals.
The square block is of a hollow structure.
The beam assembly comprises a beam and a connecting beam, the beam is movably connected with the first longitudinal beam and the second longitudinal beam through hinge clamps, the beam and the connecting beam are sequentially connected through bolts to form a rectangular structure, and two first through holes are formed in the end face of the connecting beam.
The beam assemblies are divided into two groups.
The cross beam is of a hollow structure.
The protection assembly comprises an overlapped mesh belt, angle steel and a guide key, wherein the overlapped mesh belt is of a rectangular structure, the angle steel is arranged at two ends of the short edge direction of the overlapped mesh belt, the angle steel and the overlapped mesh belt are fixedly connected through a pressing plate bolt, two second through holes are arranged on the vertical face of the angle steel at one end, the second through holes are matched with the first through holes in position, and the guide key is welded on the vertical face of the angle steel at the other end.
The protective components have four groups in total.
The length of the angle steel is slightly smaller than the width of the overlapped mesh belt and is used for overlapping between the adjacent overlapped mesh belts.
The connecting assembly is of a rectangular structure with an opening, the size of a hollow groove of the connecting assembly is matched with that of the guide key, and the connecting assembly is sleeved in the guide keys of the left and right adjacent two groups of protection assemblies.
The connecting components are divided into two groups.
The longitudinal beam assembly, the supporting assembly, the cross beam assembly and the connecting assembly are all made of aluminum alloy materials.
The utility model has the beneficial effects that: according to the utility model, active and active foreign matter prevention measures are taken during the overhaul of the pressurized water reactor nuclear power station, so that foreign matter events of the upper reactor internals hanging away from the reactor core in the process of storing the reactor internals in a storage pool are effectively reduced, and the safety and reliability of equipment are improved; according to the foreign matter prevention device for the storage area of the upper reactor internals of the nuclear power station, the storage area of the upper reactor internals is completely covered, so that external foreign matters such as other tools or equipment parts used for work can be prevented from falling into the upper reactor internals; according to the use method of the foreign matter prevention device for the storage area of the upper reactor internals of the nuclear power station, the lifting appliance platform of the reactor internals is used as an installation foundation, so that manual accessibility is realized, the installation difficulty is reduced, the risk of operation of a reactor refueling water tank is reduced as much as possible, and the implementation safety of foreign matter prevention measures is ensured; the utility model has simple structure, convenient processing and strong practicability.
Drawings
FIG. 1 is a schematic structural view of a foreign object prevention device for a storage area of an upper reactor internals of a nuclear power plant according to the present invention;
FIG. 2 is a schematic structural view of a fixing assembly in the foreign matter prevention device for the upper internals storage area of the nuclear power plant according to the present invention;
fig. 3 is a schematic structural diagram of a protection assembly in the foreign matter prevention device for the upper in-core component storage area of the nuclear power plant.
In the figure: 10 longitudinal beam assemblies, 20 supporting assemblies, 30 transverse beam assemblies, 40 protective assemblies, 50 connecting assemblies, 110 first longitudinal beams, 120 second longitudinal beams, 130 fixing assemblies, 140 hinge clamps, 131 hoop bolts, 132 connecting plates, 133 square blocks, 310 transverse beams, 320 connecting beams, 410 overlapping type net belts, 420 angle steel and 430 guide keys.
Detailed Description
The utility model is described in further detail below with reference to the figures and the embodiments.
As shown in fig. 1, the device for preventing foreign matters in the storage area of the upper internals of the nuclear power plant comprises a longitudinal beam assembly 10, a support assembly 20, a cross beam assembly 30, a protection assembly 40 and a connecting assembly 50, wherein the longitudinal beam assembly is respectively and fixedly connected to different guardrails of a lifting platform of the internals, the top of the support assembly 20 is provided with a hole structure, the longitudinal beam assembly 30 is movably connected with the hole structure of the support assembly 20, and the bottom of the support assembly 20 is supported on the upper end surface of the lifting platform of the internals and provides supporting force for the longitudinal beam assembly 10; the upper end of the longitudinal beam assembly 10 is provided with a cross beam assembly 30, and the cross beam assembly 30 and the longitudinal beam assembly 10 are sequentially connected to form a cross-shaped structure; one end of the protection assembly 40 is connected to the end of the beam assembly 30 by a bolt, and the other end of the protection assembly 40 is unfolded from the outside to the inside and fixed to the middle of the beam assembly 30 by a connection assembly 50.
The longitudinal beam assembly 10 comprises a first longitudinal beam 110, a second longitudinal beam 120, a fixing assembly 130 and hinge clamps 140, wherein the first longitudinal beam 110 and the second longitudinal beam 120 are both of a hollow structure, the size of the first longitudinal beam 110 and the size of the second longitudinal beam 120 are matched with the size of a hole structure of the supporting assembly 20, the hole structures of the supporting assembly 20 can be respectively sleeved into the first longitudinal beam 110 and the second longitudinal beam 120 from the left side and the right side to form a T-shaped structure, the hinge clamps 140 are of a concave structure, the hinge clamps 140 are respectively welded on the upper end faces of the first longitudinal beam 110 and the second longitudinal beam 120, and the longitudinal beam assembly 10 is totally divided into two groups.
As shown in fig. 2, the fixing assembly 130 includes an anchor ear 131, a connecting plate 132 and a square block 133, the anchor ear 131 has a circular hole structure in the middle, and the inner diameter of the circular hole is matched with the diameter of the guardrail of the lifting device platform of the internal member; the square block 133 is of a hollow structure, the first longitudinal beam 110 and the second longitudinal beam 120 are respectively movably connected with the square block 133, and the upper end surface and the lower end surface of the connecting plate 132 are respectively connected with the top of the hoop 131 and the bottom of the square block 133 in a welding manner; the anchor ear 131 and the square block 133 are coaxially arranged, and can rotate at any angle along the middle axis to meet the difference of the angle between the longitudinal beam assembly 10 and the guard rail of the lifting appliance platform of the pile internal member, and the fixing assemblies 130 have four groups in total.
The cross beam assembly 30 comprises a cross beam 310 and connecting beams 320, the cross beam 310 is of a hollow structure, the cross beam 310 is movably connected with the first longitudinal beam 110 and the second longitudinal beam 120 through hinge clamps 140, the cross beam 310 and the connecting beams 320 are connected through bolts in sequence to form a rectangular structure, two first through holes are formed in the end face of each connecting beam 320, and the cross beam assembly 30 is divided into two groups.
As shown in fig. 3, the protection module 40 includes an overlapped mesh belt 410, angle steel 420 and guide keys 430, the overlapped mesh belt is a rectangular structure and can be naturally curled and unfolded, the angle steel 420 is arranged at two ends of the overlapped mesh belt 410 in the short side direction, the angle steel 420 is fixedly connected with the overlapped mesh belt 410 through a press plate bolt, the length of the angle steel 420 is slightly smaller than the width of the overlapped mesh belt 410 and is used for overlapping between the adjacent overlapped mesh belts 410, two second through holes are arranged on the vertical surface of the angle steel 420 at one end, the second through holes are matched with the first through holes in position, the guide keys 430 are welded on the vertical surface of the angle steel 420 at the other end, and the protection module 40 has four groups in total.
The connecting component 50 is a rectangular structure with an opening, and the size of a hollow groove of the connecting component 50 is matched with that of the guide key 430; after the overlapped mesh belt 410 is completely unfolded, the connecting components 50 are sleeved into the guide keys 430 of the left and right adjacent two groups of protection components, the connecting components 50 can play a role in fixed connection and can also fill gaps between the adjacent protection components, and the connecting components 50 are provided with two groups in total.
Two groups of longitudinal beam assemblies are positioned on the same horizontal plane, two groups of transverse beam assemblies are positioned on the same horizontal plane, and four groups of protection assemblies are positioned on the same horizontal plane.
The longitudinal beam assembly 10, the supporting assembly 20, the cross beam assembly 30 and the connecting assembly 50 are all made of aluminum alloy materials.
The operation process of the utility model is as follows:
s1: hoisting the upper internals from the reactor core by using the internals hanger, and simultaneously storing the upper internals in an internals storage pool;
s2, moving the loading and unloading machine to enable the space of the upper part internal component storage area to meet the use requirement of the foreign matter prevention device;
s3, the water level of the water pool for storing the internal components of the pile is up to 12 m, and the internal components of the pile at the upper part are ensured to be completely immersed in the boric acid water;
s4, before the working condition of low water level of a primary loop of the nuclear power station overhaul unit begins, installing a foreign matter prevention device in an upper in-pile component storage area;
s4.1, correspondingly installing and fixing the two groups of longitudinal beam assemblies 10 on different guardrails of the in-pile member lifting appliance platform;
s4.2, adjusting the angle of the fixing component 130 and installing the supporting component 20 to ensure the parallelism of the first longitudinal beam 110 and the second longitudinal beam 120;
s4.3, respectively assembling two groups of beam assemblies 30 and four groups of protection assemblies 40 into two groups of integral assemblies on a 20-meter platform of the nuclear island plant;
s4.4, hoisting the first group of integral assemblies to the longitudinal beam assembly 10, checking and adjusting the position of the cross beam assembly 30, and ensuring that the protective assembly 40 is in seamless lap joint with the wall of the water storage pool of the in-pile member;
s4.5, unfolding two groups of protection assemblies 40 of the first group of integral assemblies, and fixedly connecting the installation connecting assemblies 50;
and S4.6, repeating S4.4 to S4.5, and mounting the second group of integral assemblies to finish the mounting of the foreign matter prevention device in the upper in-pile component storage area.
S5, during the working condition of low water level of a primary loop of the overhaul unit of the nuclear power station, using the foreign matter prevention device in the upper in-pile component storage area to perform foreign matter protection;
s6, before the working condition of the low water level of the primary loop of the nuclear power station overhaul unit is finished, checking and cleaning foreign matters on the surface of the protection component 40 to ensure the cleanliness; and (4) disassembling the foreign matter prevention device of the upper internal stacking member storage area according to the reverse steps from S4.1 to S4.6.
Claims (18)
1. The utility model provides a nuclear power station upper portion internals deposits district and prevents foreign matter device which characterized in that: including longeron subassembly, supporting component, crossbeam subassembly, protection component and coupling assembling, longeron subassembly fixed connection respectively on the different guardrail of interior component hoist platform, supporting component's top is equipped with the hole structure, longeron subassembly and supporting component's hole structure swing joint, the supporting component bottom sprag is at the interior component hoist platform up end of piling, the upper end of longeron subassembly is equipped with crossbeam subassembly, crossbeam subassembly and longeron subassembly connect gradually and form well style of calligraphy structure, the tip at crossbeam subassembly is connected to protection component's one end, protection component's other end outside-in expandes through coupling assembling and fixes the middle part at crossbeam subassembly.
2. The device for preventing foreign matters in a nuclear power plant upper internals storage area according to claim 1, wherein: the longitudinal beam assembly comprises a first longitudinal beam, a second longitudinal beam, a fixing assembly and hinge clamps, the first longitudinal beam and the second longitudinal beam are respectively sleeved into the hole structures of the supporting assemblies from the left side and the right side to form T-shaped structures, and the hinge clamps are respectively welded on the upper end surfaces of the first longitudinal beam and the second longitudinal beam.
3. The device for preventing foreign matters in a nuclear power plant upper internals storage area according to claim 2, wherein: the longitudinal beam assemblies are divided into two groups.
4. The device for preventing foreign matters in a nuclear power plant upper internals storage area according to claim 2, wherein: the first longitudinal beam and the second longitudinal beam are both of hollow structures, and the sizes of the first longitudinal beam and the second longitudinal beam are matched with the size of the hole structure of the supporting component.
5. The device for preventing foreign matters in a nuclear power plant upper internals storage area according to claim 2, wherein: the hinge card is of a concave structure.
6. The device for preventing foreign matters in a nuclear power plant upper internals storage area according to claim 2, wherein: the fixing assembly comprises a hoop, a connecting plate and a square block, the first longitudinal beam and the second longitudinal beam are movably connected with the square block respectively, the upper end face and the lower end face of the connecting plate are welded with the top of the hoop and the bottom of the square block respectively, and the hoop and the square block are coaxially arranged.
7. The device for preventing foreign matters in a nuclear power plant upper internals storage area according to claim 6, wherein: the fixing components are four groups in total.
8. The device for preventing foreign matters in a nuclear power plant upper internals storage area according to claim 6, wherein: the middle of the hoop is of a round hole structure, and the inner diameter of the round hole is matched with the diameter of a platform guardrail of the lifting appliance of the reactor internals.
9. The device for preventing foreign matters in a nuclear power plant upper internals storage area according to claim 6, wherein: the square block is of a hollow structure.
10. The device for preventing foreign matters in a nuclear power plant upper internals storage area according to claim 4, wherein: the beam assembly comprises a beam and a connecting beam, the beam is movably connected with the first longitudinal beam and the second longitudinal beam through hinge clamps, the beam and the connecting beam are sequentially connected through bolts to form a rectangular structure, and two first through holes are formed in the end face of the connecting beam.
11. The device for preventing foreign matters in a nuclear power plant upper internals storage area according to claim 10, wherein: the beam assemblies are divided into two groups.
12. The device for preventing foreign matters in a nuclear power plant upper internals storage area according to claim 10, wherein: the cross beam is of a hollow structure.
13. The device for preventing foreign matters in a nuclear power plant upper internals storage area according to claim 1, wherein: the protection assembly comprises an overlapped mesh belt, angle steel and a guide key, wherein the overlapped mesh belt is of a rectangular structure, the angle steel is arranged at two ends of the short edge direction of the overlapped mesh belt, the angle steel and the overlapped mesh belt are fixedly connected through a pressing plate bolt, two second through holes are arranged on the vertical face of the angle steel at one end, the second through holes are matched with the first through holes in position, and the guide key is welded on the vertical face of the angle steel at the other end.
14. The device for preventing foreign matters in a nuclear power plant upper internals storage area according to claim 13, wherein: the protective components have four groups in total.
15. The device for preventing foreign matters in a nuclear power plant upper internals storage area according to claim 13, wherein: the length of the angle steel is slightly smaller than the width of the overlapped mesh belt and is used for overlapping between the adjacent overlapped mesh belts.
16. The device for preventing foreign matters in a nuclear power plant upper internals storage area according to claim 13, wherein: the connecting assembly is of a rectangular structure with an opening, the size of a hollow groove of the connecting assembly is matched with that of the guide key, and the connecting assembly is sleeved in the guide keys of the left and right adjacent two groups of protection assemblies.
17. The apparatus for preventing foreign matters in a nuclear power plant upper internals storage area according to claim 16, wherein: the connecting components are divided into two groups.
18. The device for preventing foreign matters in a nuclear power plant upper internals storage area according to claim 1, wherein: the longitudinal beam assembly, the supporting assembly, the cross beam assembly and the connecting assembly are all made of aluminum alloy materials.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121972451.3U CN216084339U (en) | 2021-08-21 | 2021-08-21 | Foreign matter prevention device for nuclear power station upper reactor internals storage area |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121972451.3U CN216084339U (en) | 2021-08-21 | 2021-08-21 | Foreign matter prevention device for nuclear power station upper reactor internals storage area |
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| CN216084339U true CN216084339U (en) | 2022-03-18 |
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| CN202121972451.3U Active CN216084339U (en) | 2021-08-21 | 2021-08-21 | Foreign matter prevention device for nuclear power station upper reactor internals storage area |
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