CN113793709A - Foreign matter prevention device for upper reactor internals storage area of nuclear power station and use method - Google Patents

Foreign matter prevention device for upper reactor internals storage area of nuclear power station and use method Download PDF

Info

Publication number
CN113793709A
CN113793709A CN202110964178.8A CN202110964178A CN113793709A CN 113793709 A CN113793709 A CN 113793709A CN 202110964178 A CN202110964178 A CN 202110964178A CN 113793709 A CN113793709 A CN 113793709A
Authority
CN
China
Prior art keywords
storage area
nuclear power
longitudinal beam
power plant
foreign matters
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110964178.8A
Other languages
Chinese (zh)
Inventor
彭峰
范伟丰
孟维民
周瑞东
陈红卫
周亮
张旗峰
朱国群
李熠
齐春
于祥龙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CNNC Nuclear Power Operation Management Co Ltd
Nuclear Power Qinshan Joint Venture Co Ltd
Original Assignee
CNNC Nuclear Power Operation Management Co Ltd
Nuclear Power Qinshan Joint Venture Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by CNNC Nuclear Power Operation Management Co Ltd, Nuclear Power Qinshan Joint Venture Co Ltd filed Critical CNNC Nuclear Power Operation Management Co Ltd
Priority to CN202110964178.8A priority Critical patent/CN113793709A/en
Publication of CN113793709A publication Critical patent/CN113793709A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
    • G21C19/20—Arrangements for introducing objects into the pressure vessel; Arrangements for handling objects within the pressure vessel; Arrangements for removing objects from the pressure vessel
    • G21C19/205—Interchanging of fuel elements in the core, i.e. fuel shuffling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C25/00—Cranes not provided for in groups B66C17/00 - B66C23/00
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
    • G21C19/20—Arrangements for introducing objects into the pressure vessel; Arrangements for handling objects within the pressure vessel; Arrangements for removing objects from the pressure vessel
    • G21C19/207—Assembling, maintenance or repair of reactor components
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Mechanical Engineering (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

The invention discloses a foreign matter prevention device for an upper in-pile component storage area of a nuclear power station and a using method thereof. 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 invention has simple structure, convenient processing and strong practicability.

Description

Foreign matter prevention device for upper reactor internals storage area of nuclear power station and use method
Technical Field
The invention belongs to the field of maintenance of upper in-reactor components of nuclear power plants, and particularly relates to a foreign matter prevention device for an upper in-reactor component storage area of a nuclear power plant and a using method thereof.
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.
Disclosure of Invention
The invention aims to provide a foreign matter prevention device for an upper reactor internals storage area of a nuclear power station and a using method thereof, which can effectively solve the problem that the fault of foreign matter related equipment is caused because the external foreign matter can not be prevented from falling in the process that the upper reactor internals is lifted away from a reactor core and stored 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 invention 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.
A use method of a foreign matter prevention device for a storage area of an upper reactor internal component of a nuclear power station comprises the following steps:
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 component storage area in the upper part to meet the use requirement of the foreign matter prevention device;
s3: the water level of a water storage pool of the in-pile components is up to 12 m, and the upper in-pile components are ensured to be completely immersed in the boric acid water;
s4: before the working condition of a primary loop low water level of a nuclear power station overhaul unit begins, a foreign matter prevention device of an upper in-pile component storage area is installed;
s5: during the working condition of a primary loop of the overhaul unit of the nuclear power station at low water level, the foreign matter protection device in the upper in-pile component storage area is used for carrying out foreign matter protection;
s6: before the working condition of a primary loop low water level of the overhaul unit of the nuclear power station is finished, foreign matters on the surface of the protection component are checked and cleaned, the cleanliness is ensured, and the foreign matter preventing device in the upper in-pile component storage area is detached according to the opposite step sequence from S4.1 to S4.6.
The S4 includes:
s4.1: correspondingly installing and fixing the two groups of longitudinal beam components on different guardrails of the in-pile member lifting appliance platform;
s4.2: adjusting the angle of the fixing component and installing the supporting component to ensure the parallelism of the first longitudinal beam and the second longitudinal beam;
s4.3: two groups of beam assemblies and four groups of protection assemblies are respectively assembled into two groups of integral assemblies on a 20-meter platform of a nuclear island plant;
s4.4: hoisting the first group of integral assemblies to the longitudinal beam assembly, checking and adjusting the position of the cross beam assembly to ensure that the protective assembly is in seamless lap joint with the wall of the storage pool of the in-pile member;
s4.5: two groups of protection components of the first group of integral components are unfolded, and the mounting and connecting components are fixedly connected;
s4.6: and 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.
The invention has the beneficial effects that: according to the invention, 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 invention 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 invention 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.
A use method of a foreign matter prevention device for a storage area of an upper reactor internal component of a nuclear power station comprises the following steps:
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 (20)

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.
19. The use method of the foreign matter prevention device for the storage area of the upper reactor internals of the nuclear power plant is characterized by comprising the following steps:
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 component storage area in the upper part to meet the use requirement of the foreign matter prevention device;
s3: the water level of a water storage pool of the in-pile components is up to 12 m, and the upper in-pile components are ensured to be completely immersed in the boric acid water;
s4: before the working condition of a primary loop low water level of a nuclear power station overhaul unit begins, a foreign matter prevention device of an upper in-pile component storage area is installed;
s5: during the working condition of a primary loop of the overhaul unit of the nuclear power station at low water level, the foreign matter protection device in the upper in-pile component storage area is used for carrying out foreign matter protection;
s6: before the working condition of a primary loop low water level of the overhaul unit of the nuclear power station is finished, foreign matters on the surface of the protection component are checked and cleaned, the cleanliness is ensured, and the foreign matter preventing device in the upper in-pile component storage area is detached according to the opposite step sequence from S4.1 to S4.6.
20. The method of using a foreign matter prevention apparatus for a nuclear power plant upper internals storage area according to claim 19, wherein S4 includes:
s4.1: correspondingly installing and fixing the two groups of longitudinal beam components on different guardrails of the in-pile member lifting appliance platform;
s4.2: adjusting the angle of the fixing component and installing the supporting component to ensure the parallelism of the first longitudinal beam and the second longitudinal beam;
s4.3: two groups of beam assemblies and four groups of protection assemblies are respectively assembled into two groups of integral assemblies on a 20-meter platform of a nuclear island plant;
s4.4: hoisting the first group of integral assemblies to the longitudinal beam assembly, checking and adjusting the position of the cross beam assembly to ensure that the protective assembly is in seamless lap joint with the wall of the storage pool of the in-pile member;
s4.5: two groups of protection components of the first group of integral components are unfolded, and the mounting and connecting components are fixedly connected;
s4.6: and 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.
CN202110964178.8A 2021-08-21 2021-08-21 Foreign matter prevention device for upper reactor internals storage area of nuclear power station and use method Pending CN113793709A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110964178.8A CN113793709A (en) 2021-08-21 2021-08-21 Foreign matter prevention device for upper reactor internals storage area of nuclear power station and use method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110964178.8A CN113793709A (en) 2021-08-21 2021-08-21 Foreign matter prevention device for upper reactor internals storage area of nuclear power station and use method

Publications (1)

Publication Number Publication Date
CN113793709A true CN113793709A (en) 2021-12-14

Family

ID=78876276

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110964178.8A Pending CN113793709A (en) 2021-08-21 2021-08-21 Foreign matter prevention device for upper reactor internals storage area of nuclear power station and use method

Country Status (1)

Country Link
CN (1) CN113793709A (en)

Similar Documents

Publication Publication Date Title
EP3367389B1 (en) High earthquake-resistant fuel storage rack system for fuel pools in nuclear plants
JP4596739B2 (en) A platform for maintaining a nuclear reactor and a nuclear reactor maintenance method using the platform
CA2975543C (en) Reactor module support structure
JPS5828697A (en) Fuel storage rack of reactor
US20040258191A1 (en) Method of handling a structure and equipment of handling the same
CN216084339U (en) Foreign matter prevention device for nuclear power station upper reactor internals storage area
CN113793709A (en) Foreign matter prevention device for upper reactor internals storage area of nuclear power station and use method
KR100958350B1 (en) Inspection and Repair Stand
US7668281B2 (en) Method and tooling for dismantling, casking and removal of nuclear reactor core structures
CN109979627B (en) Hanging basket for spent fuel assembly
US6160864A (en) Seismic isolators
US20020097827A1 (en) Method of treating large scale structural body
US4123323A (en) Nuclear reactor plant
JP3101095B2 (en) Decommissioning method and system for reactor pressure vessel
CN215220278U (en) Foreign matter preventing device for flange joint surface of nuclear reactor pressure vessel
CN220487225U (en) Temporary storage grid for nuclear power plant reactor buildings and nuclear fuel assemblies
CN209820955U (en) Block bar storage and maintenance rack for pressure-resistant shell hydrostatic test
Freitag et al. REACTOR PRESSURE VESSEL REMOVAL AT A BOILING WATER REACTOR WITH SPENT FUEL IN THE ADJACENT FUEL POOL
Graae Repair and replacement of reactor internals for plant life extension
JPS629706B2 (en)
Hannerz The PIUS principle and the secure reactor concepts
Shibata et al. On estimated modes of failure of nuclear power plants by potential earthquakes
CN117246470A (en) MARK-III type enclosure system platform module and dismantling method
Shiratani et al. Feature and role of Metal Cask Handling Equipment in the Interim Storage Facility for Spent Fuels
Selsley Defueling of the Light Water Breeder Reactor at the Shippingport Atomic Power Station (LWBR Development Program)

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination