CN211555487U

CN211555487U - Full underground compact reactor refueling device

Info

Publication number: CN211555487U
Application number: CN201921082423.7U
Authority: CN
Inventors: 李雷; 刘建文; 黄然
Original assignee: Shanghai Nuclear Engineering Research and Design Institute Co Ltd
Current assignee: Shanghai Nuclear Engineering Research and Design Institute Co Ltd
Priority date: 2019-07-11
Filing date: 2019-07-11
Publication date: 2020-09-22
Anticipated expiration: 2029-07-11

Abstract

The utility model discloses a full underground compact reactor reloading device, including factory ground and reactor body, factory ground below is equipped with the pond of reloading, the pond lateral wall of reloading is equipped with detachable sealed apron, be equipped with fuel pool and reactor cavity pond in the pond of reloading, factory ground installs the mechanism of reloading that can carry out the reactor to the pond of reloading, install in the fuel pool and be used for holding the mechanism that holds of reloading and spent fuel outward transportation. The utility model discloses a main structures are all located the underground structural design, the top is unanimous with factory floor plane elevation, it has reduced the outside discernment characteristic of nuclear power plant to show, be favorable to reducing the risk that the fuel pool suffered outside threat, help promoting nuclear power plant's economic nature simultaneously, keep apart secret factory building through sealed apron, open the apron during the reloading and can carry out whole reloading and fuel outward transport operation, retrencied required numerous and diverse technology and numerous structures etc. in traditional pressurized-water reactor reloading and fuel outward transport operation.

Description

Full underground compact reactor refueling device

Technical Field

The utility model relates to a nuclear power plant operation and maintenance technical field especially relate to a full underground compact reactor reloading device.

Background

The reactor is a device capable of maintaining a controllable self-sustaining chain type nuclear fission reaction so as to realize the utilization of nuclear energy. The nuclear reactor can generate a self-sustaining chain type nuclear fission process in the nuclear reactor without adding a neutron source by reasonably arranging nuclear fuel.

The compactness of the reactor core arrangement of a pressurized water reactor nuclear power plant and the miniaturization of nuclear island plants are one of the trends of nuclear power technology development in recent years. In the case of a compact reactor, an above-ground structure is a main external feature of a nuclear power plant, and in terms of public attention, public safety and other factors, miniaturization of the above-ground structure is one of important directions for miniaturization of the compact reactor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing a full underground compact reactor refueling device.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a full underground compact reactor reloading device, includes factory ground and reactor body, factory ground below is equipped with the reloading pond, reloading pond lateral wall is equipped with can dismantle sealed apron, can dismantle sealed apron and flush with factory ground, be equipped with fuel pond and heap chamber pond in the reloading pond, the reactor body is located the bottom in the heap chamber pond, factory ground installs the mechanism of reloading that can carry out the reloading to the reactor, install in the fuel pond and be used for holding the mechanism that holds of reloading and spent fuel outward transport.

Preferably, the reloading mechanism includes that the subaerial crane assembly in factory is located to two tracks, one of them the crane assembly is factory portal crane, factory portal crane is located and is close to fuel pool one side, another the crane assembly is the handling machine, the handling machine is located and is close to heap chamber pond one side, the subaerial storehouse of berthhing the storage to the handling machine that is equipped with in factory.

Preferably, the accommodating mechanism comprises a lower in-pile component storage rack fixedly connected to the bottom in the fuel pool, an upper in-pile component storage rack fixedly connected to the bottom in the fuel pool, the upper in-pile component storage rack is located on one side of the lower in-pile component storage rack away from the side wall of the fuel pool, a fuel storage grid fixedly connected to one side of the upper in-pile component storage rack away from the side wall of the lower in-pile component storage rack in the fuel pool is located at the bottom in the upper in-pile component storage rack, a spent fuel transportation container fixedly connected to one side of the upper in-pile component storage rack away from the fuel storage grid is located at the bottom in the fuel pool, and a container transfer platform fixedly connected to the side wall of.

Preferably, the reactor body comprises a reactor pressure vessel and a lower reactor internals, the lower reactor internals are positioned below the inside of the reactor pressure vessel, the upper end of the lower reactor internals is provided with an upper reactor internals, and the upper end of the reactor pressure vessel is provided with a reactor top assembly.

Preferably, the side wall of the upper end of the reactor cavity pool is provided with a reactor top assembly storage rack, and the reactor top assembly storage rack is used for dry storage.

Preferably, a water gate is communicated between the reactor cavity water pool and the fuel water pool, and the water gate is of an openable structure.

Preferably, a high water level scale mark and a low water level scale mark are arranged in the refueling water pool, and the elevation reference of the pile top assembly storage rack is positioned above the highest water level scale mark of the refueling water pool.

Preferably, the detachable sealing cover plate is of a double-layer structure and is arranged on the side wall of the refueling water tank in a blocking mode.

The utility model discloses following beneficial effect has:

1. by adopting the structural design that all main structures are located underground, the main system, the structures and the equipment for supporting the operations of refueling and fuel outward transportation are also located in the underground area isolated by the detachable sealing cover plate, and the detachable sealing cover plate is consistent with the elevation of the plant plane, so that the external identification characteristic of the nuclear power plant is obviously reduced, the risk of the fuel pool suffering from external threats is favorably reduced, and the economy of the nuclear power plant is favorably improved;

2. the underground workshop is isolated through the detachable sealing cover plate, the detachable sealing cover plate and the pool steel cover face jointly form a pressure boundary of the reactor workshop, and all operations of material changing and fuel outward transportation can be carried out by opening the detachable sealing cover plate during material changing;

3. by adopting the integrated design of the reactor cavity refueling pool, the fuel pool, the spent fuel transport container loading pool and the cleaning pool, the refueling operation and the spent fuel outward transportation can be realized through simple operation steps during the shutdown and the opening of the sealing cover plate, and the complex process, numerous structures, equipment and the like required in the traditional pressurized water reactor refueling and fuel outward transportation operation are simplified;

4. by adopting an integrated compact layout of the refueling water pool and the refueling support equipment, the detachable sealing cover plate can be temporarily opened during the shutdown period, the close-sequence continuous refueling and spent fuel outward transportation operation is carried out, and the reactor is restarted to operate.

Drawings

FIG. 1 is a schematic structural view of a fully underground compact reactor refueling unit according to the present invention;

FIG. 2 is a schematic view of a refueling operation of a fully underground compact reactor refueling unit according to the present invention;

FIG. 3 is a schematic view of the external transportation operation structure of spent fuel of the fully underground compact reactor refueling device according to the present invention;

FIG. 4 is a schematic top view of a fully underground compact reactor refueling unit according to the present invention;

FIG. 5 is a schematic top view of a refueling operation of a fully underground compact reactor refueling unit according to the present invention;

fig. 6 is a schematic view of the top view of the spent fuel transportation operation of the fully underground compact reactor refueling device according to the present invention.

In the figure: the system comprises a reactor pressure vessel 1, a lower reactor internals 2, an upper reactor internals 3, a top assembly 4, a top assembly storage rack 5, a lower reactor internals storage rack 6, an upper reactor internals storage rack 7, a fuel storage grid 8, a spent fuel transport vessel 9, a container transfer platform 10, a water gate 11, a detachable sealing cover plate 12, a fuel pool 13, a reactor cavity pool 14, a warehouse 15, a material loading and unloading machine 16 and a factory gantry crane 17.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention can be embodied in many different forms other than those specifically described herein, and it will be apparent to those skilled in the art that similar modifications can be made without departing from the spirit and scope of the invention, and it is therefore not to be limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1-6, a fully underground compact reactor refueling device, which adopts a heat exchanger loop built-in integrated design and comprises a plant ground and a reactor body, wherein a refueling water tank is arranged below the plant ground, a detachable sealing cover plate 12 is arranged on the side wall of the refueling water tank, the detachable sealing cover plate 12 is flush with the plant ground, the detachable sealing cover plate 12 is of a double-layer structure and is arranged on the side wall of the refueling water tank in a partitioning manner, a fuel water tank 13 and a reactor cavity water tank 14 are arranged in the refueling water tank, the reactor body is arranged at the bottom of the reactor cavity water tank 14, a refueling mechanism capable of refueling the reactor is arranged on the plant ground, the refueling mechanism comprises two crane assemblies arranged on the plant ground in a rail manner, one of the crane assemblies is a plant gantry crane 17, the plant crane 17 is a universal crane, the plant crane 17 is arranged on one side close to the fuel water tank 13, the other crane component is a material loading and unloading machine 16, the material loading and unloading machine 16 is a special crane, the material loading and unloading machine 16 is positioned at one side close to the pile cavity water pool 14, and a storehouse 15 for parking and storing the material loading and unloading machine 16 is arranged on the ground of the factory.

The fuel pool 13 is internally provided with an accommodating mechanism for accommodating refueling and spent fuel for outward transportation, the accommodating mechanism comprises a lower in-pile component storage rack 6 fixedly connected to the inner bottom of the fuel pool 13, the inner bottom of the fuel pool 13 is fixedly connected with an upper in-pile component storage rack 7, the upper in-pile component storage rack 7 and the lower in-pile component storage rack 6 are used for storing upper and lower in-pile components discharged during the period of shutdown and refueling, the upper in-pile component storage rack 7 is positioned at one side of the lower in-pile component storage rack 6 far away from the side wall of the fuel pool 13, one side of the inner bottom of the fuel pool 13, which is positioned at the upper in-pile component storage rack 7 far away from the side wall of the lower in-pile component storage rack 6, is fixedly connected with a fuel storage grid 8, the fuel storage grid 8 is used for storing fuel assemblies, one side of the inner bottom of the fuel pool 13, which is positioned at the fuel storage grid 8 far away, the spent fuel transport container 9 is used for transporting and containing spent fuel, the side wall of the fuel water pool 13 is fixedly connected with a container transfer platform 10, and the container transfer platform 10 is used for transferring the spent fuel transport container.

The reactor body comprises a reactor pressure vessel 1 and a lower reactor internal member 2, the lower reactor internal member 2 is positioned below the reactor pressure vessel 1, the upper end of the lower reactor internal member 2 is provided with an upper reactor internal member 3, the upper end of the reactor pressure vessel 1 is provided with a reactor top assembly 4, the side wall of the upper end of a reactor cavity water pool 14 is provided with a reactor top assembly storage rack 5, the reactor top assembly storage rack 5 is stored in a dry mode, a high water level scale mark and a low water level scale mark are arranged in a refueling water pool, the elevation reference of the reactor top assembly storage rack 5 is positioned above the highest water level scale mark of the refueling pool, a water gate 11 is communicated between the reactor cavity water pool 14 and a fuel water pool 13, and the water gate 11 is of an openable structure and can realize communication or isolation between the reactor cavity water pool 14 and the fuel water pool 13.

In the utility model, the main structure and the equipment components are all positioned below the ground of the plant area, the detachable sealing cover plate 12 is used as an isolation and sealing boundary to maintain the normal operation of the reactor, and on the basis of the design characteristics of the detachable sealing cover plate 12 which can be opened, the device can meet the requirements of two special operation working conditions of receiving operation of loading a new fuel assembly by a new fuel transportation container and outward transportation operation of loading a spent fuel assembly by a spent fuel transportation container 9 during the shutdown and refueling periods by utilizing the operation of a gantry crane 17 and a loading and unloading machine 16 of the plant area;

when the reactor is subjected to refueling operation, after the reactor finishes a series of pre-procedures of shutdown, all detachable sealing cover plates 12 positioned above the refueling water pool are opened, and a plant area gantry crane 17 is operated to a position above the refueling water pool. At this time, the sluice gate 11 is still in a closed state, the two parts of the refueling water pool are filled with water differently, the water filling state is maintained in the fuel water pool 13 to maintain the spent fuel in the storage state to be cooled, and the stack cavity water pool 14 is in a dry state at this time. In the process of opening the sealing surface of the reactor pressure vessel 1, the water level of the reactor cavity water pool 14 gradually and synchronously rises to the flange surface of the reactor pressure vessel 1, the plant portal crane 17 is matched with a special lifting appliance to lift the reactor top assembly 4 and place the reactor top assembly on the storage rack 5 (above the water level, namely dry temporary storage), meanwhile, the water level of the fuel water pool 13 correspondingly rises until the water level of the reactor cavity water pool 14 is flush with the water level of the fuel water pool 13 at a high water level position, the water gate 11 is opened to communicate the reactor cavity water pool 14 with the fuel water pool 13, then the plant portal crane 17 is matched with the special lifting appliance to lift the upper reactor internals 3 out of the reactor core and place the upper reactor core internals on the storage rack 7 positioned in the fuel water pool 13, and the emptying of the reactor core fuel assembly loading and unloading path is finished. The loader 16, which has been commissioned from the depot 15 and opened above the core, uses the loader 16 to manipulate the core fuel assemblies one by one, placing them in turn into the storage cavities of the fuel storage racks 8 located in the fuel pool 13, completing the unloading of the entire core. Thereafter, after completion of the required series of repairs and operations, the new core assemblies (including some of the new fuel assemblies for balance-exchange replacement) placed in the fuel storage racks 8 are loaded one by one into the reactor vessel 1 by the handler 16 until core reloading is complete. Then, the plant area gantry crane 17 is matched with a special lifting appliance to sequentially reassemble the upper reactor internals 3 and the reactor top assembly 5, and the cover buckling of the reactor pressure vessel 1 is completed. Then, the sluice gate 11 is switched on again, then the water level of the reactor cavity water pool 14 is adjusted and lowered until the reactor is emptied, the reactor is reloaded, the reactor cavity water pool 14 is restored to the previous state, and the material changing operation is finished;

after the refueling operation is completed, the spent fuel transporting operation is carried out in a close sequence. The outward transportation operation is to transport the spent fuel assemblies discharged by the previous refueling in the subsequent shutdown refueling window period after the spent fuel assemblies are stored by a certain period of wet method. The spent fuel transport container 9 after being uncapped is placed at a container loading area in a fuel water tank 13 by using a plant portal crane 17 in cooperation with a special lifting appliance, then a loading and unloading machine 16 is operated to sequentially take out components to be loaded from a storage cavity of a fuel storage grillwork 8, transfer and load the components into the spent fuel transport container 9 located at a container loading area at the bottom of the tank, after the whole container is filled, the spent fuel transport container 9 is lifted to a container transfer platform 10 at a higher elevation by using the plant portal crane 17 in cooperation with the special lifting appliance, and on the platform, the plant portal crane 17 in cooperation with a special tool completes the cover buckling of the spent fuel transport container 9. So far, under the effective protection of the spent fuel transport container 9 with the sealed containment cooling and shielding functions, the water level of the fuel pool 13 is lowered from the high water level of the shielding water layer required for operating the fuel assemblies to the low water level position which only needs to maintain the shielding water layer of the fuel assemblies stored in the fuel grillwork, and after the water level is lowered, the spent fuel transport container 9 is completely exposed above the water level. After the fuel transport container 9 is subjected to demineralized water cleaning, a plant area gantry crane 17 is used for matching with a special lifting appliance to transfer a full-load container away from a fuel water pool 13 and load the full-load container into a special transport vehicle waiting on the ground of a plant area to finish all the outward transportation operations of the spent fuel, then all detachable sealing cover plates 12 are sealed, the reconstruction of a pressure boundary of a reactor plant is finished, and the reactor can start to enter the running state again.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a full underground compact reactor reloading device, includes factory floor ground and reactor body, its characterized in that, factory floor ground below is equipped with the reloading pond, reloading pond lateral wall is equipped with can dismantle sealed apron (12), can dismantle sealed apron (12) and flush with factory floor, be equipped with fuel pool (13) and heap chamber pond (14) in the reloading pond, the reactor body is located heap chamber pond (14) bottom, factory floor installs the reloading mechanism that can carry out the reloading to the reactor, install in fuel pool (13) and be used for holding the mechanism that holds of reloading and spent fuel outward transport.

2. The underground compact reactor refueling device according to claim 1, wherein the refueling mechanism comprises two crane assemblies arranged on the ground of a factory area, one of the crane assemblies is a factory area gantry crane (17), the factory area gantry crane (17) is arranged on the side close to the fuel water pool (13), the other crane assembly is a material loading and unloading machine (16), the material loading and unloading machine (16) is arranged on the side close to the cavity water pool (14), and a storehouse (15) for parking and storing the material loading and unloading machine (16) is arranged on the ground of the factory area.

3. The underground compact reactor refueling device according to claim 1, wherein the receiving mechanism comprises a lower in-pile component storage rack (6) fixedly connected to the bottom of the fuel pool (13), the bottom of the fuel pool (13) is fixedly connected with an upper in-pile component storage rack (7), the upper in-pile component storage rack (7) is located on one side of the lower in-pile component storage rack (6) far away from the side wall of the fuel pool (13), the side of the bottom of the fuel pool (13) located on the upper in-pile component storage rack (7) far away from the side wall of the lower in-pile component storage rack (6) is fixedly connected with a fuel storage grid (8), the side of the bottom of the fuel pool (13) located on the fuel storage rack (8) far away from the upper in-pile component storage rack (7) is fixedly connected with a spent fuel transport container (9), the side wall of the fuel water pool (13) is fixedly connected with a container transfer platform (10).

4. The fully underground compact reactor refueling device according to claim 1, wherein the reactor body comprises a reactor pressure vessel (1) and a lower reactor internals (2), the lower reactor internals (2) are arranged below and inside the reactor pressure vessel (1), an upper reactor internals (3) is arranged at the upper end of the lower reactor internals (2), and a reactor top assembly (4) is arranged at the upper end of the reactor pressure vessel (1).

5. The underground compact reactor refueling device according to claim 1, wherein the top storage rack (5) is provided on the upper side wall of the reactor cavity pool (14), and the top storage rack (5) is used for dry storage.

6. A fully underground compact reactor refueling unit according to claim 1, wherein a sluice gate (11) is connected between the reactor cavity water tank (14) and the fuel water tank (13), and the sluice gate (11) is in an openable structure.

7. The underground compact reactor refueling device according to claim 5, wherein the refueling water tank is provided with high-water-level scale marks and low-water-level scale marks, and the elevation reference of the reactor top assembly storage rack (5) is located above the highest-water-level scale mark of the refueling water tank.

8. A fully underground compact reactor refueling unit according to claim 1, characterized in that the removable sealing cover plate (12) is of double construction and is provided in blocks on the refueling basin side wall.