阅读说明：本技术 高温气冷堆吸收球停堆系统拆装用的隔离系统及工艺 (Isolation system and process for disassembling and assembling high-temperature gas cooled reactor absorption ball shutdown system ) 是由 董岱林 黄新东 罗英 杜华 王小彬 瓮松峰 陈书华 穆伟 殷琪 王炳炎 安彦波 于 2020-07-15 设计创作，主要内容包括：本发明公开了高温气冷堆吸收球停堆系统拆装用的隔离系统及工艺,隔离系统包括气氛隔离间、平台和贮存容器,所述气氛隔离间可拆卸式安装在压力容器顶盖上,待拆卸的吸收球停堆系统置于气氛隔离间内,气氛隔离间上设置有进气口和排气口,进气口和排气口用于向气氛隔离间内补充氦气,气氛隔离间的顶部设置有环形吊车,气氛隔离间的侧壁上设置有过渡舱,过渡舱用于连通气氛隔离间和外部空间,气氛隔离间的内壁上设置有生命支持系统和照明系统,平台可拆卸式安装在压力容器顶盖,所述贮存容器放置在平台上。本发明不仅能够避免拆装吸收球停堆系统过程中空气进入反应堆内破坏内部的氦气气氛,同时能够解决现有采用隔离膜密封导致易破损的问题。(The invention discloses an isolation system and a process for dismounting and mounting an absorption ball shutdown system of a high-temperature gas cooled reactor, wherein the isolation system comprises an atmosphere isolation chamber, a platform and a storage container, the atmosphere isolation chamber is detachably mounted on a top cover of a pressure container, the absorption ball shutdown system to be dismounted is arranged in the atmosphere isolation chamber, the atmosphere isolation chamber is provided with an air inlet and an air outlet, the air inlet and the air outlet are used for supplying helium gas into the atmosphere isolation chamber, the top of the atmosphere isolation chamber is provided with an annular crane, the side wall of the atmosphere isolation chamber is provided with a transition cabin, the transition cabin is used for communicating the atmosphere isolation chamber with the external space, the inner wall of the atmosphere isolation chamber is provided with a life support system and an illumination system, the platform is detachably mounted on the top cover of the pressure container, and the storage container is placed on the platform. The invention can not only prevent air from entering the reactor to destroy the helium atmosphere in the reactor in the process of disassembling and assembling the absorption ball shutdown system, but also solve the problem that the existing reactor is easy to damage due to the adoption of an isolation film for sealing.)

1. The isolation system for dismounting the absorption ball shutdown system of the high-temperature gas cooled reactor is characterized by comprising an atmosphere isolation room (9), a platform (14) and a storage container (20), wherein the atmosphere isolation room (9) is detachably arranged on a pressure container top cover (11), a top cover is detachably arranged at the top of the atmosphere isolation room (9), a closed cavity is formed between the atmosphere isolation room (9) and the pressure container top cover (11), an absorption ball shutdown system (10) to be dismounted is arranged in the closed cavity, an air inlet (1) and an air outlet (2) are arranged on the atmosphere isolation room (9), the air inlet (1) is used for supplementing helium into the atmosphere isolation room (9), the air outlet (2) is used for exhausting air or exhausting a mixture of the air and the helium, an annular crane (3) is arranged at the top of the atmosphere isolation room (9), be provided with on the lateral wall of atmosphere isolation room (9) cockpit (4), cockpit (4) are used for communicateing atmosphere isolation room (9) and exterior space, be provided with life support system (6) and lighting system (7) on the inner wall of atmosphere isolation room (9), platform (14) detachable the installing at pressure vessel top cap (11), storage container (20) are placed on platform (14).

2. The isolation system for dismounting and mounting the absorption ball shutdown system of the high temperature gas cooled reactor according to claim 1, wherein a monitoring system (8) is further arranged on the inner wall of the atmosphere isolation room (9), and the monitoring system (8) comprises a pressure sensor, a temperature sensor, an irradiation dose detection module and a helium concentration detection module, which are respectively used for detecting the air pressure, the temperature, the irradiation dose concentration and the helium concentration in the atmosphere isolation room (9).

3. The isolation system for disassembly and assembly of the absorption ball shutdown system of the high temperature gas cooled reactor according to claim 1, wherein the life support system (6) comprises an oxygen supply pipeline and an oxygen mask, and the lighting system (7) comprises a lighting lamp.

4. The isolation system for assembling and disassembling the absorption ball shutdown system of the high temperature gas cooled reactor according to claim 1, wherein a moving vehicle (5) matched with the transition cabin (4) is arranged on the inner wall of the atmosphere isolation room (9).

5. The isolation system for assembling and disassembling the absorption ball shutdown system of the high temperature gas cooled reactor according to claim 1, wherein the storage vessel (20) comprises a vessel body (22) and a vessel cover (21) which are matched with each other, and the vessel body (22) and the vessel cover (21) are respectively provided with a first lifting lug (23) and a second lifting lug (28).

6. The isolation system for assembling and disassembling the absorption ball shutdown system of the high temperature gas cooled reactor according to claim 5, wherein the vessel body (22) and the vessel cover (21) are both provided with shielding materials in a detachable manner.

7. The isolation system for assembling and disassembling the absorption ball shutdown system of the high temperature gas cooled reactor according to claim 6, wherein the container body (22) comprises 2 long side plates (27), 2 short side plates (26) and an inner sleeve (24), the 2 long side plates (27) and the 2 short side plates (26) enclose a rectangular frame, the inner sleeve (24) is arranged inside the rectangular frame, and an annular cavity for placing shielding materials is formed between the inner sleeve (24) and the rectangular frame.

8. The isolation system for assembling and disassembling the absorption ball shutdown system of the high temperature gas cooled reactor according to claim 6, wherein the vessel cover (21) comprises an upper cover plate (29) and a lower cover plate (30), and a cavity for placing shielding material is formed between the upper cover plate (29) and the lower cover plate (30).

9. The isolation system for assembling and disassembling the absorption ball shutdown system of the high temperature gas cooled reactor according to any one of claims 1 to 8, characterized in that a connecting plate (91) is arranged on the outer wall of the atmosphere isolation room (9), and the connecting plate (91) can be detachably fixed on the wall of the pressure vessel cabin (3).

10. The disassembly and assembly process of the isolation system for disassembling and assembling the absorption ball shutdown system of the high temperature gas cooled reactor according to any one of claims 1 to 9 is characterized by comprising the following steps:

s1, building a platform (14) on the pressure vessel top cover (11);

s2, placing the storage container (20) on the platform (14),

s3, mounting the atmosphere isolation room (9) on the top cover (11) of the pressure container;

s4, filling helium into the atmosphere isolation room (9) to a required concentration, and keeping micro-positive pressure at about 50 Pa;

s5, enabling personnel to pass through the transition cabin (4) to reach the platform (14);

s6, removing the absorption ball stopping system (10) by adopting a modular disassembly method, and disassembling the absorption ball stopping system (10) into a penetrating piece seat and related components, an absorption ball driving shell and related components, a stepping motor and related components;

s7, hoisting the penetrating piece seat and related components, the absorption ball driving shell and related components, the stepping motor and related components into a storage container (20) by using an annular crane (3);

s8, binding and sealing the undetached part of the absorption ball shutdown system (10) by using a flexible isolation film;

s9, opening a top cover of the atmosphere isolation room (9), and lifting the storage container (20) out of the atmosphere isolation room (9) by using an external crane for overhauling;

s10, after the components of the disassembled absorption ball shutdown system (10) are overhauled, hoisting the storage container (20) into an atmosphere isolation room (9) by using an external crane;

s11, installing a top cover of the atmosphere isolation room (9), filling helium into the atmosphere isolation room (9) to a required concentration, and keeping micro-positive pressure at about 50 Pa;

s12, removing the sealing film of the undetached component, and reinstalling the components of the absorption ball stop system (10);

s13, disassembling the atmosphere isolation room (9) and the platform (14) in sequence.

Technical Field

The invention relates to the technical field of disassembly and assembly of main equipment of a high-temperature gas cooled reactor of a nuclear power station, in particular to an isolation system and process for disassembling and assembling an absorption ball shutdown system of the high-temperature gas cooled reactor.

Background

The absorption ball shutdown system is a key system of a high-temperature gas cooled reactor, and serves as a second reactivity control system, plays a role in auxiliary shutdown, and can enable the reactor to reach a cold shutdown state with lower temperature when being used together with a control rod system. The absorption ball reactor-stopping system is positioned on the top cover of the reactor pressure vessel, and six sets of the absorption ball reactor-stopping system are arranged on the top cover of the reactor pressure vessel in a ring shape.

The maintenance of the absorption ball shutdown system is an important work, the absorption ball shutdown system needs to be disassembled before the absorption ball shutdown system is maintained, the absorption ball shutdown system is lifted to a site with maintenance to be maintained, and after the maintenance is finished, the absorption ball shutdown system is reassembled to ensure the normal operation of the high-temperature gas cooled reactor.

Because the coolant of the high-temperature gas cooled reactor is helium, when the absorption ball shutdown system is disassembled and reassembled, air is not allowed to enter the reactor so as to avoid damaging the helium atmosphere inside the reactor, thereby influencing the normal operation of the reactor.

Therefore, it is necessary to design an isolation system to prevent air from entering the reactor to avoid damaging the helium atmosphere inside during the process of disassembling and assembling the absorption ball reactor system, and the patent application No. 201310641701.9 discloses a process for separating a helium circulating fan from a steam generator. See figure 1. This patent uses an isolation diaphragm 301 to effect a gas seal to prevent outside air from entering the reactor interior. When the primary helium fan 42 and the steam generator 32 are separated, the two need to be sealed by the isolation film 301, when the primary helium fan 42 is lifted to a certain height, the middle of the isolation film is sealed by the first sealing clamp 305 and the second sealing clamp 306 in a separation mode, and then the isolation film between the first sealing clamp 305 and the second sealing clamp 306 is cut off, so that the separation between the primary helium fan 42 and the steam generator 32 is achieved. In the actual operation process, the method is easy to cause the damage of the isolation membranes, so that air enters the reactor, and in the reinstallation process, two isolation membranes and a sealing air bag are needed, so that the operation is complex.

Disclosure of Invention

The invention aims to provide an isolation system and an isolation process for dismounting and mounting an absorption ball shutdown system of a high-temperature gas cooled reactor, which can not only prevent air from entering a reactor to damage the helium atmosphere in the reactor in the process of dismounting and mounting the absorption ball shutdown system, but also solve the problem that the existing isolation membrane sealing is easy to damage.

The invention is realized by the following technical scheme:

the isolation system for dismounting and mounting the high-temperature gas-cooled reactor absorption ball shutdown system comprises an atmosphere isolation room, a platform and a storage container, wherein the atmosphere isolation room is detachably mounted on a top cover of the pressure container, the top of the atmosphere isolation room is detachably provided with the top cover, a closed cavity is formed between the atmosphere isolation room and the top cover of the pressure container, the absorption ball shutdown system to be dismounted is arranged in the closed cavity, the atmosphere isolation room is provided with an air inlet and an air outlet, the air inlet is used for supplementing helium gas into the atmosphere isolation room, the air outlet is used for exhausting air or a mixture of the air and the helium gas, the top of the atmosphere isolation room is provided with an annular crane, the side wall of the atmosphere isolation room is provided with a transition cabin which is used for communicating the atmosphere isolation room with an external space, and the inner wall of the atmosphere isolation room is provided with a life support system and an illumination system, the platform is detachably arranged on the top cover of the pressure vessel, and the storage vessel is placed on the platform.

According to the disassembly and assembly process of the absorption ball reactor-stopping system, high-purity helium is kept in the atmosphere isolation room, meanwhile, the helium atmosphere in the atmosphere isolation room cannot be damaged when personnel enter and exit the atmosphere isolation room due to the design of the transition cabin, so that the air can be effectively prevented from entering the reactor system on the whole, and the safety of the reactor in operation is ensured; the design of the annular crane can reduce the labor intensity of personnel; the life support system can provide effective guarantee for the safety of personnel.

The invention can not contact with the atmosphere in the operation process, can not damage the atmosphere isolation system, and can not damage the atmosphere to cause leakage; the reinstallation process is simple and easy to operate, and air cannot enter the system due to misoperation.

In conclusion, the atmosphere isolation chamber is arranged, and the atmosphere isolation chamber, the air inlet and the air outlet form an isolation system for maintaining a helium atmosphere, so that air cannot enter the reactor to damage the helium atmosphere in the reactor in the dismounting process; meanwhile, compared with the existing isolation film seal, the atmosphere isolation chamber cannot be contacted with the atmosphere isolation chamber in the operation process, an atmosphere isolation system cannot be damaged, the atmosphere cannot be damaged, and leakage is caused.

Further, still set up monitoring system on the inner wall in atmosphere isolation room, monitoring system includes pressure sensor, temperature sensor, irradiation dose detection module and helium concentration detection module, is used for detecting atmospheric pressure, temperature, irradiation dose concentration and helium concentration in the atmosphere isolation room respectively.

Further, the life support system comprises an oxygen supply line and an oxygen mask, and the lighting system comprises a lighting fixture.

Furthermore, a movable vehicle matched with the transition cabin is arranged on the inner wall of the atmosphere isolation room.

Further, the storage container comprises a container body and a container cover which are matched with each other, and a first lifting lug and a second lifting lug are respectively arranged on the container body and the container cover.

Further, the container body and the container cover are both provided with shielding materials in a detachable manner.

Further, the container body includes 2 long curb plates, 2 short curb plates and an endotheca, and 2 long curb plates and 2 short curb plates enclose into the rectangle frame, the endotheca sets up at the rectangle frame inboard, forms the annular cavity that is used for placing shielding material between endotheca and the rectangle frame.

Further, the container cover comprises an upper cover plate and a lower cover plate, and a cavity for placing shielding materials is formed between the upper cover plate and the lower cover plate.

Furthermore, a connecting plate is arranged on the outer wall of the atmosphere isolation room, and the connecting plate can be detachably fixed on the wall body of the pressure container cabin.

A disassembly and assembly process of an isolation system for disassembly and assembly of an absorption ball shutdown system based on a high-temperature gas cooled reactor comprises the following steps:

s1, building a platform on the top cover of the pressure vessel;

s2, placing the storage container on a platform,

s3, mounting the atmosphere isolation chamber on the top cover of the pressure container;

s4, filling helium into the atmosphere isolation room to reach the required concentration, and keeping the micro-positive pressure at about 50 Pa;

s5, enabling personnel to pass through the transition cabin to reach the platform;

s6, removing the absorption ball stopping system by adopting a modular disassembly method, and disassembling the absorption ball stopping system into a penetrating piece seat and related components, an absorption ball driving shell and related components, a stepping motor and related components;

s7, hoisting the penetrating piece seat and related components, the absorption ball driving shell and related components, the stepping motor and related components into a storage container by using an annular crane;

s8, binding and sealing the undetached part of the absorption ball shutdown system by using a flexible isolation film;

s9, opening a top cover of the atmosphere isolation chamber, and lifting the storage container out of the atmosphere isolation chamber by using an external crane for overhauling;

s10, after the components of the disassembled absorption ball shutdown system are overhauled, hoisting the storage container into an atmosphere isolation room by using an external crane;

s11, installing a top cover of the atmosphere isolation room, filling helium into the atmosphere isolation room to reach the required concentration, and keeping micro-positive pressure about 50 Pa;

s12, removing the sealing film of the undetached component, and reinstalling the components of the absorption ball stop system;

and S13, sequentially disassembling the atmosphere isolation room and the platform.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. the invention can effectively solve the problem that air is easy to enter a reactor loop when the absorption ball shutdown system is disassembled; the design of the atmosphere isolation chamber can effectively ensure the high-purity helium atmosphere and simultaneously provide convenience for the access of operators.

2. The modular assembling and disassembling method can reduce the labor intensity of operators and reduce the radiation dose of the operators.

3. The invention can not contact with the atmosphere in the operation process, can not damage the atmosphere isolation system, and can not damage the atmosphere to cause leakage; the reinstallation process is simple and easy to operate, and air cannot enter the system due to misoperation.

4. The storable container can be additionally provided with shielding plates with different thicknesses according to the dosage rate level of the absorption ball shutdown system, the operation of additionally arranging the shielding plates is simple, and the irradiation dosage of personnel can be reduced after shielding is additionally arranged.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic diagram of a prior art isolation system;

FIG. 2 is a schematic view of the isolation system of the present invention in cooperation with a pressure vessel chamber;

FIG. 3 is a schematic diagram of the isolation system of the present invention;

FIG. 4 is a block diagram of the through-member mount and associated components;

FIG. 5 is a block diagram of an absorbent ball drive casing and associated components;

FIG. 6 is a block diagram of a stepper motor and related components;

FIG. 7 is a structural view of a shield container;

FIG. 8 is a cross-sectional view of a container body;

FIG. 9 is a top view of the container body;

fig. 10 is a cross-sectional view of the container lid.

Reference numbers and corresponding part names in the drawings:

1-air inlet, 2-air outlet, 3-ring crane, 4-transition cabin, 5-locomotive, 6-life support system, 7-lighting system, 8-monitoring system, 9-atmosphere isolation room, 10-absorption ball stop system, 11-pressure vessel roof, 12-pressure vessel, 13-pressure vessel cabin, 14-platform, 91-connecting plate, 20-storage vessel, 21-vessel cover, 22-vessel body, 23-first lifting lug, 24-inner sleeve, 25-bottom plate, 26-short side plate, 27-long side plate, 28-second lifting lug, 29-upper cover plate, 30-lower cover plate, 32-steam generator, 42-main helium fan, 301-isolation membrane, 305-first sealing clamp, 306-second enclosure clamp.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.