CN112489829B - Primary shielding system for compactly arranging small stacks - Google Patents
Primary shielding system for compactly arranging small stacks Download PDFInfo
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- CN112489829B CN112489829B CN202011346761.4A CN202011346761A CN112489829B CN 112489829 B CN112489829 B CN 112489829B CN 202011346761 A CN202011346761 A CN 202011346761A CN 112489829 B CN112489829 B CN 112489829B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C11/00—Shielding structurally associated with the reactor
- G21C11/06—Reflecting shields, i.e. for minimising loss of neutrons
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C11/00—Shielding structurally associated with the reactor
- G21C11/02—Biological shielding ; Neutron or gamma shielding
- G21C11/022—Biological shielding ; Neutron or gamma shielding inside the reactor vessel
- G21C11/024—Biological shielding ; Neutron or gamma shielding inside the reactor vessel structurally combined with the casing
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C11/00—Shielding structurally associated with the reactor
- G21C11/02—Biological shielding ; Neutron or gamma shielding
- G21C11/04—Biological shielding ; Neutron or gamma shielding on waterborne craft
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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
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- Y02E30/30—Nuclear fission reactors
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Abstract
The invention discloses a primary shielding system for compactly arranging small piles, a shielding device, a pile pit caulking shielding device; and a proximity shielding device, wherein: the shielding device, the pile pit gap blocking shielding device and the near pile shielding device are respectively connected by a plurality of shielding modules in an overlapping or oblique connection mode to ensure no leakage seam, each shielding module comprises an enclosure and one or more shielding materials filled in the enclosure, and the shielding materials are arranged in an embedded mode. The implementation of the primary shielding system for compactly arranging the small piles can realize modularized position division disassembly and assembly, effectively utilize space and have no influence on in-service inspection of main equipment; the structure is simple, the construction cost is reduced, and the requirement of a radiation subarea of a power plant is met; shielding is carried out in a layered mode, so that the shielding effect is better, and the method is safe and reliable.
Description
Technical Field
The invention relates to the field of nuclear power, in particular to a primary shielding system for compactly arranging small stacks.
Background
In order to meet the use requirements of the marine environment and the limitation of narrow arrangement space such as limited arrangement in a cabin, a primary loop nuclear island main device usually adopts a compact arrangement form, such as an integrated design, a short pipe connection and the like. The shielding scheme of the existing small reactor structure is not perfect, and the problems of large design and implementation difficulty of the shielding structure and the like exist.
In addition, the module is rectangular plate, need to adopt the screw to carry out mechanical locking, arrange in the shielding face, the shielding module adopts single face cladding, shielding material to density board etc. this structure can't satisfy this kind of curved surface of heap hole and arranges, can't satisfy the high temperature of nearly heap department, can't satisfy the leakproofness demand of shielding material cladding, can't satisfy the installation location demand in this kind of narrow and small space of heap hole, and the density board can't satisfy neutron shielding demand.
Meanwhile, the existing small reactor cannot be applied to the environment with narrow space between main devices such as a main pump steam generator and the like and higher requirements on reactor core and out-of-reactor shielding, such as: the existing small reactor generally adopts an integrated or double-layer casing connection mode and the like, the size of a reactor pressure vessel is small, the inner wall of an RPV (resilient pressure vessel) is close to a reactor core, and neutrons reflected by the reactor core are easy to generate irradiation damage to the inner wall of the reactor pressure vessel; and the clearance between the main equipment is narrow, and the main equipment is nearer apart from the reactor core, and the installation of current commonly used shielding structure can't adapt to above-mentioned structure yet.
Disclosure of Invention
The invention aims to solve the technical problem that a primary shielding system for compactly arranging small piles is provided, modular zoning disassembly and assembly can be realized, space is effectively utilized, and in-service inspection of main equipment is not influenced; the structure is simple, the construction cost is reduced, and the requirement of a radiation subarea of a power plant is met; shielding is carried out in a layered mode, so that the shielding effect is better, and the method is safe and reliable.
In order to solve the above technical problems, an embodiment of the present invention provides a primary shielding system for compactly arranging a small stack, including: the shielding device is arranged inwards along the equipment ring cavity of the suppression water pool and is tightly attached to the vertical surface of the ring cavity of the suppression water pool, and a container cavity is formed in the shielding device; the reactor pit plugging shielding device is assembled at a gap position between the reactor pressure vessel and the vessel cavity and is used for shielding neutrons and photons at the gap position; and a near-stack shielding device which is assembled in the container cavity and is arranged on the periphery of the small-stack pressure container, wherein: the shielding device, the pile pit gap blocking shielding device and the near pile shielding device are respectively connected by a plurality of shielding modules in an overlapping or oblique connection mode to ensure no leakage gap, each shielding module comprises an enclosure and one or more shielding materials filled in the enclosure, and the shielding materials are arranged in an embedded mode; the shielding device comprises: the shielding cover body is designed into multiple layers, each layer of shielding cover body is formed by splicing and surrounding a plurality of shielding modules, and a plurality of assembling positions for placing reactor components are arranged on the shielding cover body.
Wherein, the cladding is a stainless steel cladding structure, and the welding seam on the stainless steel cladding is continuous and full penetration welding seam.
Wherein the stainless steel cladding is provided with an opening for venting.
Wherein, shield assembly still includes: supporting members are arranged between the shielding cover bodies of adjacent layers, and the opposite two sides of each supporting member are fastened on at least two adjacent shielding modules; and a stop member fastened to the support member and/or to an end of the underlying shielding cage, wherein: the shielding cover body is tightly attached to the vertical surface of the equipment ring cavity of the suppression pool through the stop component and the supporting component.
Wherein, heap pit caulking shield assembly includes: the bottom support ring can be fastened on a structure, the bottom support ring is provided with a support ring bottom surface and a support ring top surface which is inclined at a certain angle relative to the support ring bottom surface, and a first assembly key is arranged on the support ring top surface in a protruding mode; a bottom shielding module mounted on the bottom support ring; the middle shielding modules are arranged on the bottom shielding module, and the middle shielding modules are arranged in plurality and can be mutually positioned and stacked; the top shielding module is arranged on the middle shielding module; and a hold down assembly, wherein: the top shielding module, the plurality of middle shielding modules and the bottom shielding module are positioned and fixed in the circumferential direction and the vertical direction through the pressing assembly.
Wherein, compress tightly the subassembly and include: install clamp ring on top shielding module, be equipped with assembly key or assembly keyway on clamp ring or the top shielding module respectively, the clamp ring passes through the adaptation erection joint of assembly key and assembly keyway on the top shielding module.
Wherein, compress tightly the subassembly and still include: one end of the pressing base is connected with the structure, and the other end of the pressing base is fastened with the pressing ring; and a pressing plate tightly pressed on the pressing base and the pressing ring, wherein the pressing base presses the pressing ring towards the inner side so as to enhance the stability of the pressing ring to the top shielding module in the circumferential direction.
The bottom shielding module or the middle shielding module is respectively provided with an assembly key or an assembly key slot, and the middle shielding module is connected to the bottom shielding module in an adaptive installation manner through the assembly key and the assembly key slot; the adjacent middle shielding modules are connected through the adaptive installation of the assembly key and the assembly key slot; the top shielding module and the middle shielding module are connected through adaptive installation of an assembly key and an assembly key groove.
Wherein, the near-heap shielding device comprises: the shielding module body comprises a plurality of pipe shielding modules for pipelines to pass through and a plurality of inter-shielding modules arranged between the adjacent pipe shielding modules; the support column is arranged on the inner side of the shielding module body, one end of the support column is fastened on a structure, and the other opposite end of the support column is fastened on the shielding module body and used for supporting the shielding module body in the vertical direction; the locking ring locks the plurality of pipe shielding modules and the plurality of inter-module shielding modules and is used for locking the circumferential direction of the shielding module body; the coaming is tightly attached to the shielding module body and used for enhancing the stability of the shielding module body; and a locking mechanism, wherein: the multi-block pipe shielding module and the multi-block shielding modules are sequentially assembled, and are enclosed at the periphery of the outer wall of the small-sized reactor pressure vessel through the assembly of the supporting columns, the locking rings, the enclosing plates and the locking mechanisms, and a certain gap is kept between the multi-block pipe shielding module and the outer wall of the small-sized reactor pressure vessel.
Wherein, still include: the base plate is arranged at the bottom of the shielding module body and is formed by splicing a plurality of plates, one side of the base plate is connected with a structure, and the base plate is additionally provided with a shear pin for enhancing the connection stability.
The primary shielding system for compactly arranging the small stacks has the following beneficial effects: a primary shielding system for compact arrangement of small stacks comprising: the shielding device is arranged inwards along the equipment ring cavity of the suppression water pool and is tightly attached to the vertical surface of the ring cavity of the suppression water pool, and a container cavity is formed in the shielding device; the reactor pit plugging shielding device is assembled at a gap position between the reactor pressure vessel and the vessel cavity and shields neutrons and photons at the gap position; and a near-stack shielding device which is assembled in the container cavity and is arranged on the periphery of the small-sized stack pressure container, wherein: the shielding device, the pile pit gap blocking shielding device and the near-pile shielding device are respectively connected by a plurality of shielding modules in an overlapping or oblique connection mode to ensure no leakage gap, each shielding module comprises an enclosure and one or more shielding materials filled in the enclosure, and the shielding materials are arranged in an embedded mode, so that the modularized position division dismounting and mounting can be realized, the space is effectively utilized, and the in-service inspection of main equipment is not influenced; the structure is simple, the construction cost is reduced, and the requirements of radiation subareas of the power plant are met; shielding is carried out in a layered mode, so that the shielding effect is better, and the method is safe and reliable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of the overall configuration of a primary shielding system for compact arrangement of small stacks according to an embodiment of the present invention.
Fig. 2 is a schematic view showing the overall construction of a pile pit blockage shielding device of a primary shielding system for compactly arranging a small pile according to an embodiment of the present invention.
FIG. 3 is a schematic view, partially in section, of a stack pit blockage shielding arrangement for a primary shielding system for compact arrangement of small stacks, according to an embodiment of the invention.
Fig. 4 is a schematic diagram of the overall structure of a near-stack shielding device of the primary shielding system for compactly arranging a small stack according to the embodiment of the present invention.
FIG. 5 is a side view schematic of a near stack shield of a primary shield system for compact placement of a small stack in accordance with an embodiment of the present invention.
Fig. 6 is a partially sectional schematic structural view of a near stack shield of a primary shield system for compact arrangement of a small stack according to an embodiment of the present invention.
Fig. 7 is a schematic view showing the overall configuration of a shielding apparatus of a primary shielding system for compactly arranging a small stack according to an embodiment of the present invention.
Figure 8 is a side view schematic of a shield of a primary shield system for a compact arrangement of small stacks according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-8, there is shown a first embodiment of the primary screening system of the present invention for compact arrangement of small stacks.
As shown in fig. 1, the primary shielding system for compactly arranging a small stack in the present embodiment includes: the shielding device 3 is arranged inwards along the equipment annular cavity of the suppression water pool and is tightly attached to the vertical surface of the annular cavity of the suppression water pool, and a container cavity is formed in the shielding device 3; a reactor pit caulking shielding device 1 which is assembled at a gap position between a reactor pressure vessel and a vessel cavity and shields neutrons and photons at the gap position; and a near-stack shielding device 2 which is assembled in the container cavity and is arranged on the periphery of the small-sized stack pressure container, wherein: the shielding device 3, the pile pit plugging shielding device 1 and the near pile shielding device 2 are respectively connected by a plurality of shielding modules in an overlapping or oblique connection mode to ensure no leakage seam, each shielding module comprises an enclosure and one or more shielding materials filled in the enclosure, and the shielding materials are arranged in an embedded mode.
In specific implementation, referring to fig. 1 to 3 in combination, a reactor pit plugging shielding device 1 is configured to be mounted at a gap position between a reactor pressure vessel and a vessel cavity, and is used for shielding neutrons and photons at the gap position, and comprises: a bottom support ring 11 capable of being fastened on a structure, wherein the bottom support ring 11 has a support ring bottom 11a and a support ring top 11b inclined at a certain angle relative to the support ring bottom 11a, and a first assembling key 111 is convexly arranged on the support ring top 11 b; a bottom shield module 12 mounted on the bottom support ring 11; a plurality of middle shielding modules 13 mounted on the bottom shielding module 12, wherein the middle shielding modules 13 are capable of being positioned and stacked with each other; a top shield module 14 mounted on the middle shield module 13; and a hold down assembly 15, wherein: the top shielding module 14, the plurality of middle shielding modules 13 and the bottom shielding module 12 are fixed in position in both the circumferential direction and the vertical direction by the pressing assembly 15.
In specific implementation, the reactor pit caulking shielding device 1 adopts a near shielding source for shielding, and can effectively shield neutrons and photons from a reactor core. Wherein:
the bottom support ring 11 is annular in its entirety, and its support ring bottom 11a can be fixed to a corresponding structure, in this embodiment the support ring bottom 11a is kept horizontal. The support ring top surface 11b is inclined at an angle with respect to the support ring bottom surface 11a, i.e. the support ring top surface 11b is a slope. The effect of so setting is: by providing the first assembly key 111 on the inclined surface, the installation of the subsequent module is facilitated when the shielding module is keyway-assembled with the bottom support ring 11. Furthermore, the structure of the inclined surface makes it easier to produce a better positioning effect in the circumferential direction when a fastening force is applied to the bottom support ring 11 integrally with the assembly of the shielding modules.
The shielding modules are connected with the bottom support ring 11 and with each other in a keyway-adapted connection. The shielding module in this embodiment includes: a bottom shielding module 12, a middle shielding module 13 and a top shielding module 14.
One end of the bottom shielding module 12 is provided with a first assembly key slot 121 adapted to the first assembly key 111, and the bottom shielding module is fastened to the bottom support ring 11 by the first assembly key 111 and the first assembly key slot 121.
The middle shield module 13 is provided in plural and can be positioned and stacked with each other. In this embodiment, the number of the middle shielding modules 13 is three. In other embodiments, the amount can be adjusted according to actual requirements. In specific implementation, the bottom shielding module 12 or the middle shielding module 13 is respectively provided with an assembly key or an assembly key slot, and the middle shielding module 13 is connected to the bottom shielding module 12 through the adaptation of the assembly key and the assembly key slot; the adjacent middle shielding modules 13 are connected through the adaptive installation of the assembly keys and the assembly key slots; the top shielding module 14 and the middle shielding module 13 are connected by fitting of a fitting key and a fitting key groove. Through the installation mode that the assembly key is matched with the assembly key groove, the whole body of the shielding module matched with the bottom support ring 11 is in a circumferential barrel shape, and the circumferential stability of the shielding module is further realized.
It can be understood that: through the assembly structure, the shielding module divides the space between the reactor pressure vessel and the vessel cavity into a plurality of layers, and each layer is composed of a plurality of small modules.
Preferably, the inside of the top shielding module 14 or the middle shielding module 13 or the bottom shielding module 12 is filled with a shielding material to shield neutrons and photons.
Preferably, the side circumferences of the top shield module 14 or the middle shield module 13 or the bottom shield module 12 are provided with key grooves. The effect of so setting is: the adjacent modules on the same layer can be assembled and matched conveniently, and the assembly efficiency is improved.
Further, the pressing assembly 15 includes: clamp ring 151, clamp base 152 and clamp plate 153. The effect of the hold-down assembly 15 is: since the shielding module can be self-stabilized in the circumferential direction, in the vertical direction, the lower part of the shielding module is supported by the bottom supporting ring 11, and the upper part of the shielding module is additionally provided with the pressing assembly 15 to completely position the shielding module in the vertical direction.
Wherein the clamp ring 151 is mounted on the top shielding module 14. In specific implementation, the clamp ring 151 or the top shielding module 14 is respectively provided with an assembly key or an assembly key slot, and the clamp ring 151 is mounted and connected to the top shielding module 14 through the adaptation of the assembly key and the assembly key slot.
Preferably, the clamp rings in this embodiment are multiple, a single clamp ring is in a sector shape, and the modular design facilitates assembly with the top shielding module 14. Meanwhile, the plurality of compression rings can be welded into a circular whole body, and rapid assembly is implemented.
The pressing base 152 is plate-shaped, the bottom end of the pressing base 152 is connected to a structure, and the other end of the pressing base 152 is fastened to the pressing ring 151. In a specific embodiment, the pressing base 152 is connected to the structure by welding, and set screws are provided on both sides of the pressing base 152, and the set screws are directly connected to the pressing ring 151 to press the pressing ring 151 inward. Because clamp ring 151 is fan-shaped single module, after squeezing it to the inboard, be favorable to strengthening its stability in circumference. The pressing plate 153 is connected with the pressing base 152 through bolts, and the pressing plate extends to the upper part of the pressing ring to press the pressing ring. The reactor pit plugging shielding device may be positioned in a vertical orientation.
Further, the method also comprises the following steps: wedge block 16, wedge block 16 is connected with top shielding module 14, and wedge block 16 is the effect: the top shielding module 14, the plurality of middle shielding modules 13 and the bottom shielding module 12 which are integrally stacked are compressed and can be adjusted during the installation process.
The reactor pit caulking shielding device 1 in the embodiment is applied to a compactly arranged reactor, the distance between primary equipment of a primary circuit nuclear island of the compactly arranged reactor is narrow, the space of a reactor cabin is small, the reactor core is positioned below a reactor building platform, more neutrons and more photons are upwards emitted from the reactor core through a gap between a reactor pressure vessel and a vessel cavity, the adverse irradiation influence on personnel and equipment is increased compared with that of a land-based large reactor, the reactor pit caulking shielding device 1 assembled in a modularized mode can shield the neutrons and the photons, the safety of workers and maintainers of a power plant is protected, and the radiation damage of the equipment and materials in the reactor cabin is controlled at a lower level.
Meanwhile, the reactor pit plugging shielding device 1 assembled in a modularized manner is convenient to mount and dismount, and meets the requirement of fast mounting and dismounting of an avoidance space in the maintenance process of primary circuit main equipment; can use various shielding materials, can shield nearby sources, ensures good shielding effect, and provides protection for personnel and equipment
As shown in fig. 1, 4-6, the near-stack shielding device 2 is arranged in the circumferential direction of the small-sized stack pressure vessel to shield neutrons and photons emitted or scattered from the inside of the vessel, so that the radiation dose around the pressure vessel during operation can be effectively reduced, and the radiation damage to surrounding equipment can be reduced.
The near stack shielding device 2 for a small stack in the present embodiment includes: a shielding module body 21, the shielding module body 21 including a plurality of pipe shielding modules 211 through which a pipe can pass and a plurality of inter-shielding modules 212 disposed between adjacent pipe shielding modules 211; a support column 22, the support column 22 is arranged inside the shielding module body 21, one end of the support column 22 is fastened on the structure, and the other opposite end is fastened on the shielding module body 21 for supporting the shielding module body 21 in the vertical direction; a locking ring 23, wherein the locking ring 23 locks the plurality of pipe shielding modules 211 and the plurality of inter-block shielding modules 212 to lock the shielding module body 21 in the circumferential direction; the coaming 24 is tightly attached to the shielding module body 21 and used for enhancing the stability of the shielding module body 21; and a locking mechanism 25, wherein: the plurality of tube shielding modules 211 and the plurality of inter-block shielding modules 212 are sequentially assembled and are enclosed on the periphery of the outer wall of the small stack pressure vessel through the assembly of the supporting columns 22, the locking rings 23, the enclosing plates 24 and the locking mechanisms 25, and a certain gap is kept between the outer wall of the small stack pressure vessel and the outer wall of the small stack pressure vessel.
In specific implementation, the tube shielding module 211 and the inter-shielding module 212 are hollow stainless steel shell structures, and the welding seam on the stainless steel shell is a continuous and full penetration welding seam. The tube shielding module 211 or the inter-shielding module 212 is filled with one or more shielding materials in a damascene arrangement. The tube shielding module 211 and the inter-shielding module 212 form a complete cylinder after being assembled, and have good self-stability. It can be understood that: the number of the tube shielding modules 211 or the inter-shielding modules 212 and the splicing manner are not limited, and the tube shielding modules or the inter-shielding modules may be spliced into other shapes than the cylindrical integral structure, and may be determined according to the required shielding effect and the overall shape of the adapted pressure vessel.
The support column 22 is disposed inside the shielding module body 21, one end of which is fastened to a structure by bolting or direct welding, and the other opposite end of which is fastened to the shielding module body 21, so as to support the shielding module body 21 in a vertical direction, thereby preventing the upper part of the step from declining.
The locking ring 23 locks the plurality of pipe shielding modules 211 and the plurality of inter-module shielding modules 212 by screws, and the locking ring 23 is formed by splicing two ring plates and is connected with the shielding module body 1 into a whole for locking the circumference of the shielding module body 21.
Further, the method also comprises the following steps: and the backing plate 26 is arranged at the bottom of the shielding module body 21, the backing plate 26 is formed by splicing a plurality of plates, and one side of the backing plate 26 is connected with a structure through a screw. Shear pins are added to the backing plate 26 to enhance the stability of the connection.
Further, the shroud 24 includes a support shroud 241 and a duct shroud 242.
In practice, the supporting shroud 241 is a plate-shell structure, and the inner side of the supporting shroud is tightly attached to the shielding module body 21 and presses the shielding module body 21 inward. The monolithic shielding module body 21 has a fan shape and is pressed inward to enhance self-stability. And a fastening screw is added on the vertical surface of the supporting enclosing plate 241, and is locked with the shielding module body 21, so that the shielding module body 21 is fastened while being positioned. The lower end of the supporting enclosing plate 241 passes through the backing plate 26 and is locked with the structure through bolts.
The duct enclosure 242 is a plate-shell structure, and the inner side of the duct enclosure 242 is tightly attached to the tube shielding module 211 to press the tube shielding module 211 inward. And a fastening screw is added on the vertical surface of the pipeline enclosing plate, and is locked with the pipe shielding module 211, so that the pipe shielding module 211 is fastened while positioning. The lower end of the duct enclosure 242 is secured to the structure floor by passing through the spacer 26.
Further, the locking mechanism 25 includes: a side locking mechanism 251 and a tube side locking mechanism 252.
In practice, the side locking mechanism 251 is a plate-shell structure, and is mainly used for positioning the upper layer of the shielding module body. The lower end of the shielding module is locked with the supporting coaming 241 through bolts, and the inner side of the shielding module is tightly attached to the shielding module body and locked through screws.
The tube side locking mechanism 252 is mainly used for radially positioning the tube shielding module 211 at the main tube to prevent radial displacement. The tube side locking mechanism 252 is a structural member similar to an angle steel, one end surface of which is locked with the housing of the tube shielding module 211, and the other end surface of which is locked with the inter-shielding module 212 between the tube shielding module 211 through a screw.
The close-stack shielding device for the small-sized stack in the embodiment is arranged on the circumference of the pressure vessel and keeps a gap with the outer wall of the pressure vessel cylinder; the annular loop main equipment cavity shielding cover is positioned on the inner side of the main equipment cavity of the suppression pool and clings to the vertical surface of the main equipment cavity. The modular design concept is adopted, so that convenience in installation and disassembly is ensured, and the requirement of quick assembly and disassembly of an avoidance space in the maintenance process of the main equipment of the primary loop is met; the external irradiation dose suffered by workers and the public can be ensured to be lower than the designed target value; ensuring that a maintainer is allowed to enter the reactor cabin to carry out necessary maintenance on equipment within a certain period after the reactor is stopped; the radiation damage of equipment and materials in the reactor cabin is controlled at a lower level, and the radiation damage of the equipment in the cabin such as a steam generator is limited; can resist the high temperature of the near pile, is sealed and coated, and can not generate the effects of blocking a flow passage by material scraps, and the like.
As shown in figure 1 and figures 7-8, the shielding device 3 is arranged inwards along the equipment annular cavity of the suppression water pool and is tightly attached to the vertical surface of the annular cavity of the suppression water pool, and the top of the shielding device is fixed with the steel structure platform. The method specifically comprises the following steps: the shield cover 31 has a plurality of layers, i.e., upper and lower layers 31a and 31b in the present embodiment, and may have a plurality of layers in other embodiments. Each layer of shielding cover body 31 is formed by splicing and surrounding a plurality of shielding modules T, and a plurality of assembling positions 31c for placing reactor components are arranged on the shielding cover body 31; a supporting member 32 is arranged between the shielding cover bodies 31a and 31b of adjacent layers, and two opposite sides of the supporting member 32 are fastened on at least two adjacent shielding modules; and a stop member 33 fastened to the support member 32 and/or to the end of the underlying shielding cage, wherein: the shielding enclosure is held tightly against the elevation of the equipment ring cavity of the suppression basin by the stop members 33 and the support members 32.
The shielding cover body 31 is assembled in a modularized and regional manner, and the basic assembly unit is a shielding module T, so that a limited space is utilized. Meanwhile, the whole device is detachable, and in-service inspection of the main equipment is not influenced.
During specific implementation, the shielding module T is a hollow stainless steel shell structure, and a welding seam on the stainless steel shell is a continuous and full penetration welding seam. The shielding module T is filled with one or more shielding materials, wherein the shielding materials are in a mosaic arrangement. The shielding module T forms the shielding device 3 after being assembled, and has good self-stability. It can be understood that: the number of the shielding modules T and the splicing mode are not limited, and the shielding modules T can be lapped or obliquely spliced according to the required shielding effect and the overall shape of the components such as the pressure container and the like to be matched so as to ensure no leakage. Wherein: and a stainless steel ladle shell of the shielding module T is provided with an opening for exhausting.
Further, the supporting member 32 is disposed between the shielding cases 31a and 31b of adjacent layers, and the supporting member 32 in this embodiment is a supporting plate, and the supporting plate is welded to the vertical surface of the main equipment chamber of the suppression pool, and provides an installation reference surface for the stopper member 33.
Further, the stopper member 33 includes: a bottom stop 331 and a middle stop 332, wherein: one end of the bottom stop block 331 is connected to the structure, and the side surface thereof is fastened to the vertical surface of the shielding module T; the middle stop 332 is connected to the vertical faces of two adjacent shielding modules by the support member 32.
The shielding device 3 in the embodiment can reduce neutrons and photons scattered out of the reactor cabin, and reduce irradiation damage to equipment in the connected cabin section; the shielding device 3 can protect the safety of workers and maintainers in a power plant, reduce neutrons and photons leaked out of a reactor cabin, lighten the activation of materials outside a shielding case, reduce the activation source item in safety during shutdown, and more effectively reduce the weight of secondary shielding of the reactor so as to reduce the construction cost.
The implementation of the primary screening system for compact arrangement of small stacks of the invention has the following beneficial effects: a primary shielding system for compact arrangement of small stacks comprising: the shielding device is arranged inwards along the equipment ring cavity of the suppression water pool and is tightly attached to the vertical surface of the ring cavity of the suppression water pool, and a container cavity is formed in the shielding device; the reactor pit plugging shielding device is assembled at a gap position between the reactor pressure vessel and the vessel cavity and is used for shielding neutrons and photons at the gap position; and a near-stack shielding device which is assembled in the container cavity and is arranged on the periphery of the small-stack pressure container, wherein: the shielding device, the pile pit seam blocking shielding device and the near pile shielding device are respectively connected by a plurality of shielding modules in an overlapping or oblique connection mode to ensure no seam leakage, each shielding module comprises an enclosure and one or more shielding materials filled in the enclosure, and the shielding materials are arranged in an embedded mode, so that modularized position division disassembly and assembly can be realized, the space is effectively utilized, and in-service inspection of main equipment is not influenced; the structure is simple, the construction cost is reduced, and the requirements of radiation subareas of the power plant are met; shielding is carried out in a layered mode, so that the shielding effect is better, and the method is safe and reliable.
Claims (10)
1. A primary shielding system for compact arrangement of small stacks, comprising:
the shielding device is arranged inwards along the equipment ring cavity of the suppression water pool and is tightly attached to the vertical surface of the ring cavity of the suppression water pool, and a container cavity is formed in the shielding device;
the reactor pit plugging shielding device is assembled at a gap position between the reactor pressure vessel and the vessel cavity and is used for shielding neutrons and photons at the gap position; and
a near-stack shielding device fitted in the vessel cavity and disposed circumferentially of the mini-stack pressure vessel, wherein:
the shielding device, the pile pit plugging shielding device and the near-pile shielding device are respectively connected by a plurality of shielding modules in an overlapping or oblique connection mode so as to ensure no leakage seam, each shielding module comprises an enclosure and one or more shielding materials filled in the enclosure, and the shielding materials are arranged in an embedded mode;
the shielding apparatus includes: the reactor component shielding cover comprises a shielding cover body, wherein the shielding cover body is of multiple layers, each layer of shielding cover body is formed by splicing and surrounding a plurality of shielding modules, and a plurality of assembling positions for placing reactor components are arranged on the shielding cover body.
2. The primary shielding system for a compact deployment mini-stack of claim 1 wherein the containment shell is a stainless steel containment shell structure and the weld on the stainless steel containment shell is a continuous, full penetration weld.
3. A primary screening system for a compact arrangement mini-stack as claimed in claim 2 wherein the stainless steel cladding is provided with an aperture for venting.
4. A primary screening system for a compact arrangement mini-stack as defined in claim 1 wherein said screening means further comprises:
the shielding cover comprises at least two shielding modules, wherein the shielding covers are arranged in a row, and the shielding covers are arranged in the row; and
a stop member secured to the support member and/or to an end of the underlying shielding cage, wherein:
the shielding cover body is tightly attached to the vertical surface of the equipment ring cavity of the suppression water pool through the stopping component and the supporting component.
5. A primary screening system for compact placement of mini-stacks as claimed in any of claims 1 to 3 wherein said stack pit blockage shielding means comprises:
the bottom support ring can be fastened on a structure and is provided with a support ring bottom surface and a support ring top surface which is inclined at a certain angle relative to the support ring bottom surface, and a first assembly key is convexly arranged on the support ring top surface;
a bottom shielding module mounted on the bottom support ring;
the middle shielding modules are arranged on the bottom shielding module, and the middle shielding modules are arranged in plurality and can be mutually positioned and stacked;
a top shielding module mounted on the middle shielding module; and
a compression assembly, wherein: the top shielding module, the middle shielding modules and the bottom shielding module are positioned and fixed in the circumferential direction and the vertical direction through the pressing assembly.
6. The primary shielding system for a compact arrangement mini-stack of claim 5, wherein the hold-down assembly comprises:
install and be in on the shielding module of top clamp ring, clamp ring or be equipped with assembly key or assembly keyway on the shielding module of top respectively, the clamp ring passes through the adaptation erection joint of assembly key and assembly keyway and is in on the shielding module of top.
7. The primary shielding system for a compact arrangement mini-stack of claim 6, wherein the hold-down assembly further comprises:
one end of the compaction base is connected with a structure, and the other end of the compaction base is fastened with the compaction ring;
and a pressing plate tightly pressed on the pressing base and the pressing ring, wherein the pressing base presses the pressing ring towards the inner side so as to enhance the stability of the pressing ring to the top shielding module in the circumferential direction.
8. The primary shielding system for compact arrangement of mini-stacks as claimed in claim 5, wherein the bottom shielding module or the middle shielding module is provided with a fitting key or a fitting key groove, respectively, and the middle shielding module is connected to the bottom shielding module by fitting the fitting key and the fitting key groove;
the adjacent middle shielding modules are connected through the adaptive installation of the assembly key and the assembly key slot;
the top shielding module and the middle shielding module are connected through adaptive installation of an assembly key and an assembly key groove.
9. A primary screening system for compact arrangement of mini-stacks as claimed in any one of claims 1 to 3, wherein said near stack screening means comprises:
a shielding module body including a plurality of pipe shielding modules through which a pipe can pass and a plurality of inter-shielding modules disposed between adjacent pipe shielding modules;
the supporting column is arranged on the inner side of the shielding module body, one end of the supporting column is fastened on a structure, and the other opposite end of the supporting column is fastened on the shielding module body and used for supporting the shielding module body in the vertical direction;
a locking ring for locking the plurality of pipe shielding modules and the plurality of inter-shielding modules to each other to lock the circumferential direction of the shielding module body;
the coaming is tightly attached to the shielding module body and used for enhancing the stability of the shielding module body; and
a locking mechanism, wherein: the pipe shielding modules and the inter-shielding modules are sequentially assembled, and are enclosed and blocked at the periphery of the outer wall of the small-sized reactor pressure vessel through the assembly of the supporting columns, the locking rings, the enclosing plates and the locking mechanisms, and a certain gap is kept between the pipe shielding modules and the outer wall of the small-sized reactor pressure vessel.
10. The primary shielding system for a compact arrangement mini-stack of claim 9, further comprising: establish the backing plate of shielding module body bottom, the backing plate is formed by the amalgamation of polylith panel, one side of backing plate links to each other with the structure, install the shear pin additional on the backing plate for reinforcing connection stability.
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| CN202011346761.4A CN112489829B (en) | 2020-11-26 | 2020-11-26 | Primary shielding system for compactly arranging small stacks |
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| JP4909951B2 (en) * | 2008-07-14 | 2012-04-04 | 株式会社東芝 | Neutron shield |
| EP2572360A4 (en) * | 2010-05-18 | 2015-12-16 | Veritas Medical Solutions Llc | Compact modular particle facility having layered barriers |
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| JPH0452597A (en) * | 1990-06-21 | 1992-02-20 | Ishikawajima Harima Heavy Ind Co Ltd | Storage tank for radioactive fluid |
| CN1193407A (en) * | 1995-07-13 | 1998-09-16 | 西屋电气公司 | Thermal insulating barrier and neutron shield providing integrated protection for a nuclear reactor vessel |
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