阅读说明：本技术 安全壳系统的布置方法以及安全壳系统布置结构 (Arrangement method of containment system and containment system arrangement structure ) 是由 樊彦芳 赵晓山 贾小攀 王振中 贝晨 谷振杰 禇松良 苏锦成 吴巧英 薛静 于 2020-11-26 设计创作，主要内容包括：本发明公开了一种安全壳系统的布置方法以及安全壳系统布置结构,该方法包括以下步骤：将非能动设计的堆腔注水冷却水池布置于安全壳外壳的上方；将管道间布置于安全壳外壳外,且堆腔注水冷却水池的高度高于管道间的高度,堆腔注水冷却水池与管道间连通,管道间与安全壳夹层空间连通；在安全壳内壳上布置贯穿件。在一定程度上降低安全壳高度,避免堆腔注水冷却水池容量过大导致安全壳直径增加,缩减土建投资,提高其经济性。在保证冷却水量供应充足的前提下充分利用反应堆厂房空间,减小安全壳体积,提高其经济性,改善其结构强度,提高安全性。(The invention discloses an arrangement method of a containment system and a containment system arrangement structure, wherein the method comprises the following steps: arranging a reactor cavity water injection cooling pool with a passive design above a containment shell; arranging pipelines outside a containment shell, wherein the height of a reactor cavity water injection cooling water pool is higher than that of the pipelines, the reactor cavity water injection cooling water pool is communicated with the pipelines, and the pipelines are communicated with a containment interlayer space; a penetration piece is arranged on the inner shell of the containment. The height of the containment vessel is reduced to a certain extent, the diameter of the containment vessel is prevented from being increased due to the fact that the capacity of a reactor cavity water injection cooling water pool is too large, civil engineering investment is reduced, and the economy of the containment vessel is improved. The reactor plant space is fully utilized on the premise of ensuring sufficient supply of cooling water, the volume of the containment is reduced, the economy is improved, the structural strength is improved, and the safety is improved.)

1. A method of deploying a containment system, the containment system comprising a containment vessel, the containment vessel comprising: the steam generator and the reactor cavity pressure vessel are arranged in the inner space of the containment shell, and the arrangement method of the containment system comprises the following steps:

arranging a reactor cavity water injection cooling pool with a passive design above a containment shell;

arranging pipelines outside a containment shell, wherein the height of a reactor cavity water injection cooling water pool is higher than that of the pipelines, the reactor cavity water injection cooling water pool is communicated with the pipelines, and the pipelines are communicated with a containment interlayer space;

the penetration piece is arranged on the containment inner shell, when a reactor cavity water injection cooling water pool is used for serious accidents, the reactor cavity water injection cooling system is started, cooling water in the reactor cavity water injection cooling water pool enters the containment inner shell through the pipe and the penetration piece under the action of gravity, and is injected into a flow channel between the reactor cavity pressure vessel and the heat insulation layer on the inner wall of the containment inner shell to cool the reactor cavity pressure vessel.

2. The method of deploying a containment system of claim 1, further comprising the steps of:

the passive containment heat exporting system cooling water pool is arranged outside a containment shell, the passive containment heat exporting system cooling water pool is arranged above a pipeline room and is communicated with the pipeline room, the passive containment heat exporting system cooling water pool is arranged in a containment inner shell, when the passive containment heat exporting system cooling water pool is used for serious accidents, the passive containment heat exporting system is started, cooling water in the passive containment heat exporting system cooling water pool flows through the pipeline room and a containment interlayer space under the action of gravity, enters the passive containment heat exporting system heat exchanger in the containment inner shell through a penetration piece, and utilizes the density difference caused by the temperature difference of water after the cooling water in the passive containment heat exporting system heat exchanger exchanges heat with steam and mixed gas in the containment, the heat flows out of the inner shell of the containment vessel along the penetrating piece, flows through the interlayer space of the containment vessel and the pipeline, returns to the cooling water pool of the passive containment vessel heat exporting system, and accordingly carries out the heat in the containment vessel.

3. The method for disposing a containment system according to claim 2, wherein the step of disposing the passive containment heat export system cooling pool outside the containment enclosure is specifically:

the reactor cavity water injection cooling water pool is used as a center, the passive containment heat exporting system cooling water pool is arranged around the reactor cavity water injection cooling water pool, and the reactor cavity water injection cooling water pool is arranged at the top of the containment shell.

4. The arrangement method of the containment system according to claim 2, wherein the step of arranging the passive containment heat exporting system heat exchanger in the inner containment shell is as follows:

and suspending the passive heat conduction system heat exchanger of the containment on the inner wall of the containment inner shell.

5. The arrangement method of the containment system according to claim 2, wherein the passive containment heat export system heat exchanger, the penetration piece, the steam generator and the reactor cavity pressure vessel are respectively arranged in the inner containment shell from top to bottom.

6. The method of deploying a containment system of claim 2, further comprising the steps of:

the secondary side passive residual heat removal system equipment room is arranged above the containment shell, the secondary side passive residual heat removal system equipment room is arranged below the passive containment heat removal system cooling water pool, and the passive containment heat removal system cooling water pool is communicated with the secondary side passive residual heat removal system equipment room.

7. The method of deploying a containment system of claim 6, further comprising the steps of:

when a serious accident occurs, condensed water in the secondary side passive waste heat deriving system heat exchanger passes through the space between pipelines and the interlayer space of a containment, enters the secondary side of a steam generator in the containment through a penetration piece, is heated by a coolant of a primary side reactor of the steam generator, then is changed into steam, flows out of the secondary side of the steam generator under the action of temperature difference, and then returns to the secondary side passive waste heat deriving system heat exchanger through the penetration piece, the interlayer space of the containment and the pipelines, and is condensed again into water by a cooling water tank of a passive containment heat deriving system to complete natural circulation; the water replenishing tank is used for compensating the reduction of the water level when the water level of the secondary side of the steam generator is reduced to a certain degree and the water of the water replenishing tank enters the secondary side of the evaporator.

8. The containment system deployment method of claim 6, wherein the containment enclosure comprises: the reactor cavity water injection cooling water pool is arranged at the top of the semi-ellipsoidal shell dome, and cooling water pools of pipelines, equipment rooms and a passive containment heat exporting system are arranged at the shoulder of the semi-ellipsoidal shell dome.

9. The method for arranging the containment system according to any one of claims 6 to 8, wherein the conduit room comprises: the arrangement method comprises the following steps: the equipment room is arranged between the first pipeline room and the second pipeline room, the containment is used as the center, the first pipeline room is located on the inner side of the equipment room, the second pipeline room is located below the equipment room, and the height between the first pipeline rooms is higher than that between the second pipeline rooms.

10. A containment system arrangement structure is characterized by being arranged by the arrangement method of any one of claims 1-8.

Technical Field

The invention belongs to the technical field of nuclear power plant factory building arrangement, and particularly relates to an arrangement method and an arrangement structure of a containment system.

Background

The third-generation pressurized water reactor nuclear power technology in China fully absorbs Fudao nuclear accident experience feedback, improves nuclear safety, adopts a safety design concept of combining active and passive, and the passive system is a standby measure of the active system and provides diversified safety means for deep defense at each level. Under the conditions of serious accidents and power outage of a whole plant, a reactor cavity water injection cooling system, a passive containment heat exporting system and a secondary side passive waste heat exporting system can be put into use, and safety functions of preventing core damage and ensuring the integrity of a pressure vessel after the core damage, providing secondary side cooling of a steam generator, ensuring no overpressure of the containment and the like are respectively executed. Under the prior art, the reactor cavity water injection cooling water tank is arranged on one side of the reactor core of the inner shell of the double-layer containment shell in a fan shape, so that the space utilization rate in the containment shell is not high, and the reactor cavity water injection cooling water tank is arranged higher to meet the requirements of sufficient cooling water quantity and passive performance, and brings difficulty for hoisting equipment in the shell. In addition, the cooling water pool of the passive containment heat exporting system is externally hung on the shell of the double-layer containment, an overhanging structure needs to be designed under the arrangement, the overhanging is subjected to bending, shearing and twisting, the construction difficulty is high, and the structural safety is low.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide an arrangement method of a containment system and an arrangement structure of a containment system, which can fully utilize the space of a reactor plant on the premise of ensuring sufficient supply of cooling water, reduce the volume of the containment, improve the economy, improve the structural strength and improve the safety.

The technical scheme adopted for solving the technical problem of the invention is to provide an arrangement method of a containment system, wherein the containment system comprises a containment, and the containment comprises: the arrangement method of the containment system comprises the following steps of:

arranging a reactor cavity water injection cooling pool with a passive design above a containment shell;

arranging pipelines outside a containment shell, wherein the height of a reactor cavity water injection cooling water pool is higher than that of the pipelines, the reactor cavity water injection cooling water pool is communicated with the pipelines, and the pipelines are communicated with a containment interlayer space;

the penetration piece is arranged on the containment inner shell, when a reactor cavity water injection cooling water pool is used for serious accidents, the reactor cavity water injection cooling system is started, cooling water in the reactor cavity water injection cooling water pool enters the containment inner shell through the pipe and the penetration piece under the action of gravity, and is injected into a flow channel between the reactor cavity pressure vessel and the heat insulation layer on the inner wall of the containment inner shell to cool the reactor cavity pressure vessel.

Preferably, the arrangement method of the containment system further includes the following steps:

the passive containment heat exporting system cooling water pool is arranged outside a containment shell, the passive containment heat exporting system cooling water pool is arranged above a pipeline room and is communicated with the pipeline room, the passive containment heat exporting system cooling water pool is arranged in a containment inner shell, when the passive containment heat exporting system cooling water pool is used for serious accidents, the passive containment heat exporting system is started, cooling water in the passive containment heat exporting system cooling water pool flows through the pipeline room and a containment interlayer space under the action of gravity, enters the passive containment heat exporting system heat exchanger in the containment inner shell through a penetration piece, and utilizes the density difference caused by the temperature difference of water after the cooling water in the passive containment heat exporting system heat exchanger exchanges heat with steam and mixed gas in the containment, the heat flows out of the inner shell of the containment vessel along the penetrating piece, flows through the interlayer space of the containment vessel and the pipeline, returns to the cooling water pool of the passive containment vessel heat exporting system, and accordingly carries out the heat in the containment vessel.

Preferably, the step of disposing the passive containment heat export system cooling water pool outside the containment shell specifically includes:

the reactor cavity water injection cooling water pool is used as a center, the passive containment heat exporting system cooling water pool is arranged around the reactor cavity water injection cooling water pool, and the reactor cavity water injection cooling water pool is arranged at the top of the containment shell.

Preferably, the step of disposing the passive containment heat exporting system heat exchanger in the containment inner shell specifically includes:

and suspending the passive heat conduction system heat exchanger of the containment on the inner wall of the containment inner shell.

Preferably, the passive containment heat exporting system heat exchanger, the penetrating piece, the steam generator and the reactor cavity pressure vessel are respectively arranged in the containment inner shell from top to bottom.

Preferably, the arrangement method of the containment system further includes the following steps:

the secondary side passive residual heat removal system equipment room is arranged above the containment shell, the secondary side passive residual heat removal system equipment room is arranged below the passive containment heat removal system cooling water pool, and the passive containment heat removal system cooling water pool is communicated with the secondary side passive residual heat removal system equipment room.

Preferably, the arrangement method of the containment system further includes the following steps:

when a serious accident occurs, condensed water in the secondary side passive waste heat deriving system heat exchanger passes through the space between pipelines and the interlayer space of a containment, enters the secondary side of a steam generator in the containment through a penetration piece, is heated by a coolant of a primary side reactor of the steam generator, then is changed into steam, flows out of the secondary side of the steam generator under the action of temperature difference, and then returns to the secondary side passive waste heat deriving system heat exchanger through the penetration piece, the interlayer space of the containment and the pipelines, and is condensed again into water by a cooling water tank of a passive containment heat deriving system to complete natural circulation; the water replenishing tank is used for compensating the reduction of the water level when the water level of the secondary side of the steam generator is reduced to a certain degree and the water of the water replenishing tank enters the secondary side of the evaporator.

Preferably, the containment shell comprises: the reactor cavity water injection cooling water pool is arranged at the top of the semi-ellipsoidal shell dome, and cooling water pools of pipelines, equipment rooms and a passive containment heat exporting system are arranged at the shoulder of the semi-ellipsoidal shell dome.

Preferably, the duct room includes: the arrangement method comprises the following steps: the equipment room is arranged between the first pipeline room and the second pipeline room, the containment is used as the center, the first pipeline room is located on the inner side of the equipment room, the second pipeline room is located below the equipment room, and the height between the first pipeline rooms is higher than that between the second pipeline rooms.

The invention also provides a containment system arrangement structure which is arranged by the arrangement method.

The arrangement method of the containment system and the arrangement structure of the containment system have the following beneficial effects:

(1) the reactor cavity water injection cooling pool is key equipment influencing the diameter of the containment shell, the space in the containment shell is moved to the top of the containment shell, the space in the containment shell is not occupied, other system arrangements are adjusted, the space in the shell can be fully utilized, the height of the containment shell is reduced to a certain extent, the increase of the diameter of the containment shell caused by the overlarge capacity of the reactor cavity water injection cooling pool is avoided, the civil engineering investment is reduced, and the economical efficiency of the containment shell is improved. The reactor plant space is fully utilized on the premise of ensuring sufficient supply of cooling water, the volume of the containment is reduced, the economy is improved, the structural strength is improved, and the safety is improved.

(2) After the top of the reactor cavity water injection cooling water pool, the space in the containment shell is increased, and the hoisting allowance is increased.

Drawings

FIG. 1 is an elevation view of a containment system arrangement in embodiment 2 of the invention;

FIG. 2 is a cross-sectional view A-A of the containment system arrangement of FIG. 1.

In the figure: 1-filling water into a cooling water pool in the reactor cavity; 2-passive containment heat is led out of a system cooling water pool; 3-equipment room; 4-passive containment heat export system heat exchanger; 5-a penetration; 6-a reactor cavity pressure vessel; 7-a first pipeline chamber; 8-a second pipeline; 9-a steam generator; 10-inner containment shell; 11-containment shell; 12-containment sandwich space; 13-secondary side passive waste heat deriving system heat exchanger; 14-a water replenishing tank; 15-cylindrical housing wall; 16-semi-ellipsoidal shell dome.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.

Example 1

The embodiment provides a method for arranging a containment system, wherein the containment system comprises a containment, and the containment comprises: the arrangement method of the containment system comprises the following steps of:

arranging a reactor cavity water injection cooling pool with a passive design above a containment shell;

arranging pipelines outside a containment shell, wherein the height of a reactor cavity water injection cooling water pool is higher than that of the pipelines, the reactor cavity water injection cooling water pool is communicated with the pipelines, and the pipelines are communicated with a containment interlayer space;

the penetration piece is arranged on the containment inner shell, when a reactor cavity water injection cooling water pool is used for serious accidents, the reactor cavity water injection cooling system is started, cooling water in the reactor cavity water injection cooling water pool enters the containment inner shell through the pipe and the penetration piece under the action of gravity, and is injected into a flow channel between the reactor cavity pressure vessel and the heat insulation layer on the inner wall of the containment inner shell to cool the reactor cavity pressure vessel.

The embodiment also provides a containment system arrangement structure which is arranged by the arrangement method.

The arrangement method and the arrangement structure of the containment system have the following beneficial effects:

(1) the reactor cavity water injection cooling pool is key equipment influencing the diameter of the containment shell, the space in the containment shell is moved to the top of the containment shell, the space in the containment shell is not occupied, other system arrangements are adjusted, the space in the shell can be fully utilized, the height of the containment shell is reduced to a certain extent, the increase of the diameter of the containment shell caused by the overlarge capacity of the reactor cavity water injection cooling pool is avoided, the civil engineering investment is reduced, and the economical efficiency of the containment shell is improved. The reactor plant space is fully utilized on the premise of ensuring sufficient supply of cooling water, the volume of the containment is reduced, the economy is improved, the structural strength is improved, and the safety is improved.

(2) After the top of the reactor cavity water injection cooling water pool, the space in the containment shell is increased, and the hoisting allowance is increased.

Example 2

The embodiment provides a method for arranging a containment system, as shown in fig. 1, where the containment system includes a containment vessel including: the arrangement method of the containment system comprises the following steps that an inner containment shell 10 and an outer containment shell 11 are arranged outside the inner containment shell 10, a containment interlayer space 12 is formed between the inner containment shell 10 and the outer containment shell 11, a steam generator 9 and a reactor cavity pressure vessel 6 are arranged in the inner containment shell 10, and the arrangement method of the containment system comprises the following steps:

arranging a reactor cavity water injection cooling water pool 1 with a passive design above a containment shell 11;

arranging pipelines outside a containment shell 11, wherein the height of a reactor cavity water injection cooling water pool 1 is higher than that of the pipelines, the reactor cavity water injection cooling water pool 1 is communicated with the pipelines, and the pipelines are communicated with a containment interlayer space 12;

the penetration piece 5 is arranged on the containment shell 10, when the reactor cavity water injection cooling water pool 1 is used for a serious accident, the reactor cavity water injection cooling system is started, cooling water in the reactor cavity water injection cooling water pool 1 enters the containment shell 10 through the pipelines and the penetration piece 5 under the action of gravity, and is injected into a flow channel between the reactor cavity pressure vessel 6 and the heat insulation layer on the inner wall of the containment shell 10 to submerge the lower end enclosure of the reactor cavity pressure vessel 6 and cool the reactor cavity pressure vessel 6.

Preferably, the arrangement method of the containment system further includes the following steps:

the passive containment heat exporting system cooling water pool 2 is arranged outside a containment shell 11, the passive containment heat exporting system cooling water pool 2 is arranged above a pipeline, the passive containment heat exporting system cooling water pool 2 is communicated with the pipeline, the passive containment heat exporting system heat exchanger 4 is arranged in a containment inner shell 10, when the passive containment heat exporting system cooling water pool 2 is used for serious accidents, a passive containment heat exporting system is started, cooling water in the passive containment heat exporting system cooling water pool 2 flows through the pipeline and a containment interlayer space 12 under the action of gravity, enters the passive containment heat exporting system heat exchanger 4 in the containment inner shell 10 through a penetrating piece 5, and after cooling water in the passive containment heat exporting system heat exchanger 4 exchanges heat with steam and mixed gas in the containment, the density difference caused by the temperature difference of water penetrates out of the inner shell 10 of the containment along the penetrating piece 5, flows through the interlayer space 12 of the containment and the pipeline, returns to the passive containment heat exporting system cooling water pool 2, and accordingly brings out the heat in the containment.

When the passive containment heat exporting system is started, the height difference between the passive containment heat exporting system cooling water pool 2 and the passive containment heat exporting system heat exchanger 4 and the temperature difference between the passive containment heat exporting system heat exchanger 4 and the passive containment heat exporting system cooling water pool 2 are driving forces for driving the passive containment heat exporting system cooling water to form natural circulation and take away heat in a containment shell.

Preferably, the step of disposing the passive containment heat export system cooling water pool 2 outside the containment shell 11 includes:

the reactor cavity water injection cooling water pool 1 is used as a center, the passive containment heat exporting system cooling water pool 2 is arranged around the reactor cavity water injection cooling water pool 1, and the reactor cavity water injection cooling water pool 1 is arranged at the top of the containment shell 11. The passive containment heat export system cooling water pool 2 is arranged at the top of the containment shell 11.

Preferably, the step of disposing the passive containment heat export system heat exchanger 4 in the containment inner shell 10 specifically includes:

the passive heat conduction system heat exchanger 4 of the containment is suspended on the inner wall of the inner shell 10 of the containment.

Preferably, the passive containment heat export system heat exchanger 4, the penetration piece 5, the steam generator 9 and the reactor cavity pressure vessel 6 are respectively arranged in the containment inner shell 10 from top to bottom.

Preferably, the arrangement method of the containment system further includes the following steps:

the secondary side passive waste heat deriving system equipment room 3 is arranged above the containment shell 11, the secondary side passive waste heat deriving system equipment room 3 is arranged below the passive containment heat deriving system cooling water pool 2, and the passive containment heat deriving system cooling water pool 2 is communicated with the secondary side passive waste heat deriving system equipment room 3.

The number of the passive containment heat export system cooling water pools 2 is set according to the number of the passive containment heat export system sequences, the passive containment heat export system cooling water pools 2 are independent from each other, and the physical isolation of passive safety facilities is realized, and the embodiment is implemented according to 3 passive containment heat export system sequences, as shown in fig. 2.

Preferably, the arrangement method of the containment system further includes the following steps:

a secondary side passive waste heat deriving system heat exchanger 13 and a water replenishing tank 14 are arranged in the secondary side passive waste heat deriving system equipment room 3, when the secondary side passive waste heat deriving system heat exchanger 13 is used for a serious accident, condensed water in the secondary side passive waste heat deriving system heat exchanger 13 passes through a pipeline room and a containment interlayer space 12, enters a secondary side of a steam generator 9 in a containment through a penetrating piece 5, is heated by a primary side reactor coolant of the steam generator 9 to become steam, then flows out of the secondary side of the steam generator 9 under the action of temperature difference, returns to the secondary side passive waste heat deriving system heat exchanger 13 through the penetrating piece 5, the containment interlayer space 12 and the pipeline room, is condensed into water again by a passive containment heat deriving system cooling water tank 2, and completes natural circulation; the water replenishing tank 14 is used for starting an isolation valve of the secondary side passive residual heat removal system water replenishing tank 14 positioned in the equipment room 3 when the secondary side water level of the steam generator 9 is reduced to a certain degree, and water in the water replenishing tank 14 enters the secondary side of the evaporator to compensate the reduction of the water level.

The passive containment heat deriving system and the secondary side passive waste heat deriving system share a set of passive containment heat deriving system cooling water pool 2, the height difference between a secondary side passive waste heat deriving system heat exchanger 13 and a steam generator 9 which are positioned in an equipment room 3, and the temperature difference between the steam generator 9 and the secondary side passive waste heat deriving system heat exchanger 13 are driving forces for driving cooling water of the secondary side passive waste heat deriving system to form natural circulation. The steam mixture in the secondary side passive waste heat exporting system heat exchanger 13 is condensed into water again by the passive containment heat exporting system cooling water pool 2, so that the heat on the secondary side of the steam generator 9 is taken out of the shell.

Preferably, the containment shell 11 includes: the reactor cavity water injection cooling water pool comprises a cylindrical shell cylinder wall 15 and a semi-ellipsoidal shell dome 16 arranged on the cylindrical shell cylinder wall 15, the reactor cavity water injection cooling water pool 1 is arranged at the top of the semi-ellipsoidal shell dome 16, and the cooling water pool 2 of the pipeline room, the equipment room 3 and the passive containment heat exporting system are arranged at the shoulder of the semi-ellipsoidal shell dome 16.

Preferably, the duct room includes: a first conduit room 7, a second conduit room 8 communicating with the first conduit room 7, the arranging method further comprising the steps of: the equipment room 3 is arranged between a first pipeline room 7 and a second pipeline room 8, the first pipeline room 7 is located on the inner side of the equipment room 3 by taking the containment as the center, the second pipeline room 8 is located below the equipment room 3, and the height of the first pipeline room 7 is higher than that of the second pipeline room 8.

The embodiment also provides a containment system arrangement structure which is arranged by the arrangement method.

The arrangement method and the arrangement structure of the containment system have the following beneficial effects:

(1) the reactor cavity water injection cooling pool 1 is key equipment influencing the diameter of the containment shell 10, the space in the containment shell 10 is moved to the top of the containment shell 11, the space in the containment shell is not occupied, the hoisting allowance is increased, after the arrangement of other systems in the containment shell is adjusted, the space in the shell can be fully utilized, the height of the containment shell is reduced to a certain extent, the diameter of the containment shell is compressed, the phenomenon that the diameter of the containment shell is increased due to the fact that the capacity of the reactor cavity water injection cooling pool 1 is too large is avoided, civil engineering investment is reduced, and the economical efficiency. The reactor plant space is fully utilized on the premise of ensuring sufficient supply of cooling water, the volume of the containment is reduced, the economy is improved, the structural strength is improved, and the safety is improved.

(2) After the top of the reactor cavity water injection cooling water pool 1 is lifted, the space in the containment shell is increased, and the hoisting allowance is increased.

(3) In the prior art, the arrangement that the cooling water pool 2 of the passive containment heat exporting system is externally hung on the containment shell 11 needs to design an overhanging structure, and the overhanging structure has the functions of bending, shearing and twisting, so that the passive containment heat exporting system has high requirements on materials and poor safety. After the passive containment heat exporting system cooling water pool 2 is jacked, a cantilever structure can be omitted, and the structural safety is improved.

(4) After the reactor cavity water injection cooling water tank 1 and the passive containment heat export system cooling water tank 2 are jacked, the water storage capacity of the two water tanks is increased, the water consumption of a nuclear island plant under a serious accident can be ensured to a greater extent, other systems are not needed to be used for compensating evaporation loss under the water consumption, and the system can be simplified.

(5) After the reactor cavity water injection cooling water tank 1 and the passive containment heat export system cooling water tank 2 are arranged on the top, the containment top structure has similar functions and materials, modular manufacturing and installation of the containment dome can be considered, and possibility is provided for reducing field construction amount, potential safety hazards, construction period and engineering cost.

It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.