WO2024051023A1 - Comprehensive fortification system for cold source safety of nuclear power plant - Google Patents

Abstract

Disclosed in the present invention is a comprehensive fortification system for cold source safety of a nuclear power plant. The system comprises a first-stage damming unit, a second-stage damming unit, a third-stage damming unit and a fourth-stage damming unit which are sequentially arranged in the direction of a water flow entering the nuclear power plant; the first-stage damming unit comprises a harbor entrance damming net arranged at the intake and at least two harbor entrance buoy monitoring units arranged outside the harbor entrance damming net; the second-stage damming unit comprises a second-stage damming net and a first net-bag damming net which are spaced apart in the water flow direction and are used for carrying out full-section damming on seawater passing through an intake open channel; the third-stage damming unit comprises a second net-bag damming nets; and the fourth-stage damming unit comprises a final net. According to the comprehensive fortification system for cold source safety of a nuclear power plant of the present invention, by means of the sequential arrangement of the four stages of damming units, comprehensive treatment such as monitoring, early warning, damming, cleaning, etc., is carried out on disaster-causing objects such as marine organisms and floating objects carried in an intake water flow, such that the disaster-causing objects are prevented from blocking a nuclear power plant filtering device.

Description

Nuclear power plant cold source safety comprehensive fortification system Technical field

The invention relates to the technical field of nuclear power water intake engineering, and in particular to a nuclear power plant cold source safety comprehensive fortification system.

Background technique

During the operation of a nuclear power plant, conventional island condensers and nuclear island equipment require a large amount of cooling water as a "cold source". Seawater once-through cooling is the first choice for Binhai Nuclear Power Plant, and a nuclear power plant that builds six million-kilowatt units in a cluster is the first choice. For example, the total water intake of its seawater is between 300m ³ /s-420m ³ /s. When a nuclear power plant pumps a large amount of seawater, a large number of marine organisms and floating objects in the seawater will invade and block the seawater filtering equipment. The blockage of the filtering equipment will lead to a reduction in the flow capacity, resulting in insufficient water supply flow and causing unit load reduction. operation, steam turbine tripping and even nuclear island reactor safety protection tripping, causing huge economic losses to nuclear power plants and threatening the operational safety of nuclear power plants.

Therefore, in the design of nuclear power plants, it is necessary to combine the characteristics of the outbreak and invasion of marine organisms, floating objects and other disaster-causing objects at the site, and design the comprehensive cold source safety fortification system to ensure that the nuclear power plant can continue to obtain energy during its lifespan. Cooling water with sufficient water quantity and quality requirements.

In early nuclear power plant designs, clogging of filter equipment due to the invasion of marine organisms, floating objects and other hazards was rare, so a permanent process system was not set up upstream of the water intake pumping station. After the operation of the nuclear power plant, due to the influence of the marine environment and human economic activities, the marine organisms, floating objects and other disaster-causing objects carried during the water intake process of the nuclear power plant greatly exceeded the design load of the original filtering equipment, often causing the filtering equipment to become clogged, and then Affecting the power generation and nuclear safety of power plants, for this reason, operating nuclear power plants generally add temporary interception measures upstream of the water intake pump room, such as setting up multiple floating interception nets in the water intake and open water intake channels to achieve the goal of protecting marine life and floating objects. Pre-filtrate disaster-causing materials, reduce the load of the back-end circulating water filtration system (in the water pump room), and avoid or reduce shutdowns. For newly designed nuclear power plants, disaster-causing objects such as marine life and floating objects must be considered as important external events as design inputs to ensure that the nuclear power plant’s response to disaster-causing objects such as marine life and floating objects can be improved through reasonable fortification design. level of fortification, thereby improving the power generation efficiency and operational safety level of nuclear power plants.

However, due to the complexity and variability of the marine environment, the differences in plant site conditions, and the uncertainty of the impact of human activities, there is currently a lack of operable and easy-to-execute design methods for fortifications based on marine organisms, floating objects and other disaster-causing objects. , such as the intensity of disaster-causing material outbreaks, interception network design standards, monitoring and early warning requirements, etc. are not clear, and they mainly rely on short-term operating experience, resulting in great differences in the disaster-causing material fortification levels of different design units and different factory sites.

Contents of the invention

The technical problem to be solved by the present invention is to provide a nuclear power plant cold source safety comprehensive fortification system that improves the fortification level of a nuclear power plant against marine organisms, floating objects and other disaster-causing objects.

The technical solution adopted by the present invention to solve the technical problem is to provide a comprehensive fortification system for the safety of cold sources in nuclear power plants, including a first-level interception unit, a second-level interception unit, and a third-level interception unit arranged in sequence according to the direction in which water flows into the nuclear power plant; Level 4 interception unit;

The first-level interception unit includes a gate interception net arranged at the water intake, and at least two gate buoy monitoring units arranged outside the gate interception net corresponding to opposite sides of the water intake;

The secondary interception unit includes secondary interception nets and a first pocket-type interception net arranged at intervals according to the direction of water flow, and is used to intercept seawater passing through the open water intake channel in a full-section;

The three-level interception unit includes a second pocket-type interception net, the minimum mesh diameter of which is 2 mm;

The four-level interception unit includes a pocket bottom net; both ends of the pocket bottom net are respectively fixed on two opposite banks of the open water intake channel through cables.

Preferably, a predetermined height is left between the bottom of the gate interception net and the water bottom, and the top of the gate interception net is higher than the water surface; the aperture of the interception net of the gate interception net is 50mm-100mm.

Preferably, the first-level interception unit further includes a mobile monitoring device arranged outside the entrance interception network;

The mobile monitoring device includes a vessel carrying monitoring equipment.

Preferably, the gate buoy monitoring unit is a self-floating structure, and the equipment it carries includes at least one of water quality monitoring instruments, pH meters, thermometers, flow meters, sonar, and in-situ imaging equipment.

Preferably, the first-level interception unit also includes shore-based video monitoring units respectively installed on the water intake breakwaters on both sides of the water intake; the monitoring range of the shore-based video monitoring unit covers the water intake, the water intake harbor and the water intake open channel. The water intake flows through the water area.

Preferably, the first-level interception unit also includes at least one harbor buoy monitoring unit arranged in the water intake basin; the harbor buoy monitoring unit is used to monitor water quality parameters and marine life conditions in the water intake basin area.

Preferably, the first-level interception unit further includes a mobile spraying device arranged on the bank base of the open water intake channel;

The mobile spraying device is used to spray disinfecting liquid into seawater to disinfect microalgae and produce an aggregation effect.

Preferably, the first-level interception unit further includes a drive-away device arranged on the bank base of the open water intake channel;

The driving away device is used to emit sound waves corresponding to the target organism and drive the target organism away from the water inlet.

Preferably, the mesh aperture of the secondary interception net is 50mm; the secondary interception net is a flat net or a triangular net.

Preferably, a first tension meter is provided on the cable of the secondary interception net, and the first tension meter is used to monitor the stress of the cable in real time.

Preferably, the open water intake channel is provided with a first access bridge connected across its two revetments and corresponding to the position of the first net bag-type interception net; among the several pile foundations below the first access bridge, A through-flow span is formed between each two adjacent pile foundations, and each through-flow span is provided with a set of the first pocket-type interception net.

Preferably, the secondary interception unit further includes at least two first monitoring points arranged upstream of the secondary interception network;

Each first monitoring point is equipped with a sonar, a microbial monitoring unit and an underwater video monitoring unit.

Preferably, the secondary interception unit further includes a floating row arranged downstream of the first bag-type interception net.

Preferably, the secondary interception unit further includes a liquid level monitoring unit respectively provided upstream of the secondary interception net and downstream of the first net pocket interception net.

Preferably, the secondary interception unit further includes a first operating platform extending from a revetment of the open water intake channel toward the center of the open water intake channel; the first operating platform is located downstream of the first pocket-type interception net. The elevation is higher than the average high tide level and serves as a working platform for docking of operating vessels and operation and maintenance personnel.

Preferably, the open water intake channel is provided with a second access bridge connected across its two revetments and corresponding to the position of the second net bag-type interception net; among the pile foundations below the second access bridge, A through-flow span is formed between each two adjacent pile foundations, and each through-flow span is provided with a set of the second pocket-type interception net.

Preferably, the three-level interception unit also includes at least one second monitoring point located upstream of the net pocket interception network;

The second monitoring point is equipped with sonar, microbial monitoring unit and underwater video monitoring unit.

Preferably, the three-level interception unit further includes a second operating platform extending from a revetment of the open water intake channel toward the center of the open water intake channel; the second operating platform is located downstream of the second pocket-type interception net, and The elevation is higher than the average high tide level and serves as a working platform for docking of operating vessels and operation and maintenance personnel.

Preferably, a second tension meter is provided on the cable of the bottom pocket net, and the second tension meter is used to monitor the stress of the cable in real time.

The beneficial effects of the present invention: through the sequential arrangement of four-level interception units, it is used to carry out comprehensive disposal such as monitoring, early warning, interception and cleaning of marine organisms, floating objects and other disaster-causing objects carried in the water flow, so as to avoid the hazard-causing objects from clogging the nuclear power plant. Filtration equipment.

The invention can be standardized and systematized and constructed based on the protection against intrusion of disaster-causing objects such as marine organisms and floating objects. It is the core of the water intake filtration system of the nuclear power plant. It can be used as an independent permanent process system of the nuclear power plant and is installed at the front end of the water intake pump room of the nuclear power plant. , covering entities ranging from the open sea to the water pumping station frontier.

Description of the drawings

The present invention will be further described below in conjunction with the accompanying drawings and examples. In the accompanying drawings:

Figure 1 is a schematic structural diagram of a nuclear power plant cold source safety comprehensive fortification system according to an embodiment of the present invention.

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

The nuclear power plant cold source safety comprehensive fortification system of the present invention is suitable for large-flow water intake facilities that draw water from rivers, rivers, lakes, seas, etc. The water intake facilities usually consist of a water intake port, a water intake port, an open water intake channel, and their connection with the land. It consists of connected revetments (factory revetments).

As shown in Figure 1, a nuclear power plant cold source safety comprehensive fortification system according to an embodiment of the present invention includes a nuclear power plant cold source information integrated smart platform 50, and a first-level interception unit 10 arranged in sequence according to the direction of water flow from the water intake into the open water channel. , the second-level interception unit 20, the third-level interception unit 30 and the fourth-level interception unit 40.

The present invention uses the first-level interception unit 10, the second-level interception unit 20, the third-level interception unit 30 and the fourth-level interception unit 40 to carry out multi-level interception of water sources entering the nuclear power plant, thereby causing disasters to marine organisms, floating objects, etc. carried in the seawater. intercept objects to prevent them from entering the nuclear power plant.

Among them, the first-level interception unit 10 may include an entrance interception network 11, an entrance buoy monitoring unit 12, a mobile monitoring device 13, a shore-based video monitoring unit 14, a harbor buoy monitoring unit 15, a mobile spraying device 16, and a drive-away unit. Device 17 etc.

The gate interception net 11 is installed at the water intake and is connected between the shore anchor piers 101 at the ends of the two water intake breakwaters. As the first interception facility, the gate interception net 11 is installed between the two shore-based anchor piers 101 in a non-full-section manner. There is a predetermined height between the bottom of the entrance interception net 11 and the water bottom, that is, it is not connected to the water bottom; the top of the entrance interception net 11 is higher than the predetermined height of the water surface, and its main interception objects are floating objects on the water surface, such as oil slicks and floating debris. phytoplankton, large surface marine organisms, etc., and can be used to intercept unpowered ships.

The main body of the entrance interception net 11 is formed by an oil boom, or by an oil boom and a half-section interception net. The main body of the entrance interception net 11 can be made of rubber material and is fixed on the shore anchor pier 101 through a cable. The cable is connected to the concrete anchor block at the bottom of the water through an anchor chain. The joint action of the cable + anchor chain makes the entrance interception net 11 is in place at the installation location.

The gate interception net 11 is designed to withstand waves of not less than 3m, and the aperture of the interception net is 50mm-100mm.

The outside of the first-level interception unit 10 is the water source (such as river, river, lake, sea, etc.). The water surface area of the water source is wide. The first-level interception unit 10 further monitors the water surface and underwater hazards (marine life, floating objects, etc.) in a large area of water by setting up a mobile monitoring device 13. The monitoring range can reach 10km or beyond. The mobile monitoring device 13 includes ships equipped with various required monitoring equipment, and the ships may be unmanned ships or manned ships.

At least two entrance buoy monitoring units 12 are provided, corresponding to the opposite sides of the water intake, and are arranged outside the entrance interception net 11. They are mainly used to monitor seawater quality parameters, marine life, etc. in the peripheral area of the water intake.

The gate buoy monitoring unit 12 adopts a self-floating structure and does not need to rely on shore-based civil construction facilities for fixation. It can be fixed by underwater anchor blocks. Under the action of currents, waves, and wind, it allows a certain degree of free displacement and can work normally. The equipment carried on the entrance buoy monitoring unit 12 may include water quality monitoring instruments, pH meters, thermometers, flow meters, sonar, in-situ imaging equipment, etc. The sonar should be able to realize full-section monitoring of the entire water intake cross section.

The shore-based video monitoring unit 14 is located on the water intake breakwaters on both sides of the water intake, and can achieve 24-hour all-weather monitoring. The monitoring scope should cover all water intake and circulation waters such as the water intake, water intake harbors, and water intake open channels, and can monitor large-scale water surface targets, water surfaces, etc. Video collection of floating objects.

The harbor buoy monitoring unit 15 is installed in the water intake harbor. The harbor buoy monitoring unit 15 is mainly used to monitor sea water quality parameters, marine life and other conditions in the water intake harbor area. The harbor buoy monitoring unit 15 adopts a self-floating structure, and the equipment carried thereon may include water quality monitoring instruments, pH meters, thermometers, flow meters, sonar, in-situ imaging equipment, etc. The harbor buoy monitoring unit 15 monitors the disaster-causing objects that have entered the water intake. Through comparative analysis with the data of the entrance buoy monitoring unit 12, the trend of disaster-causing objects entering the water intake in the open sea can be grasped, and the intrusion of the disaster-causing objects can be determined. It has a strong indicative effect.

The water intake port is the emergency operation area of the nuclear power plant and can be equipped with a certain number of operating vessels 18 for normal inspection and maintenance of interception and various monitoring units. When large-scale disaster-causing substances erupt, it can also The emergency operation area carries out temporary installation of interception nets, manual emergency salvage and other operations to reduce the interception load of the back-end interception unit.

For micro-algae in marine life, such as Phaeocystis globus, Noctiluca, etc., their individual sizes are usually below the millimeter level and are difficult to effectively intercept through interception nets. Therefore, mobile algae can be deployed on the shore bases on both sides of the open water intake channel. The spraying device 16 sprays the disinfecting liquid into the seawater in opposite directions. The disinfecting liquid can disinfect the microalgae and produce an aggregation effect, thereby turning them into larger-sized individuals, which can then sink to the bottom of the water or be intercepted by an interception net.

For large fish with strong swimming ability among marine organisms, sound waves of specific frequencies can be used to drive away the fish. To this end, the present invention disposes drive-off devices 17 on the shore bases on both sides of the open water channel to emit specific sound waves. Sound waves cause target organisms to swim away from the water intake, thereby protecting specific fish and avoiding clogging of the interception unit. Generally, large fish are not the main hazards of nuclear power plants. When based on biological protection or other specific goals, such eviction devices can be configured as needed17.

In the first-level interception unit 10, various monitoring signals such as the mobile monitoring device 13, the gate buoy monitoring unit 12, the harbor buoy monitoring unit 15, and the shore-based video monitoring unit 14 are all connected to the nuclear power plant cold source information comprehensive smart platform 50 Perform display, storage and analysis work.

The secondary interception unit 20 may include a secondary interception net 21 and a first pocket-type interception net 22, at least two first monitoring points 23, liquid level monitoring units 24 and 25, a floating row 26 and a first operating platform 28, etc.

The secondary interception net 21 and the first pocket-type interception net 22 are arranged at intervals according to the direction of water flow, and the secondary interception net 21 and the first pocket-type interception net 22 are respectively arranged between the two opposite bank revetments of the water intake open channel to protect the water passing through the water intake open channel. The sea water is intercepted in full section. According to the direction of water flow, the secondary interception network 21 is located at the front end, and the first pocket-type interception network 22 is located at the rear end; the secondary interception network 21 is a large-aperture interception network.

Both the secondary interception network 21 and the first pocket-type interception network 22 are fixed by pile foundations at certain intervals on the water intake open channel section. Through the joint enclosure of the pile foundations and the water intake open channel bank protection, full-section interception is achieved to ensure that all seawater can pass through. The secondary interception network 21 and the first pocket-type interception network 22 perform interception and filtering.

Both the secondary interception network 21 and the first pocket-type interception network 22 are required to perform their interception functions normally under the once-in-a-century high water level and the once-in-a-century low water level, and be able to withstand a 14-level typhoon and wave action of more than 1m, and can withstand a once-in-a-century event. The designed standard disaster-causing material explosion intensity will not cause overall damage in the event of a design-basis safety shutdown earthquake in the nuclear power plant, thus not affecting the water intake safety of the nuclear island's important plant water system.

Among them, the mesh aperture of the secondary interception net 21 is 50mm, which is a flat net or a triangular net. It is used to intercept and filter large marine organisms and floating objects larger than 50mm. The net body is made of high-molecular polyethylene, nylon, etc. Material. The first tension gauge can be set on the cable of the secondary interception network 21 as needed to monitor the stress of the cable in real time. By setting the early warning value, corresponding power plant actions can be arranged.

The first monitoring point 23 is set upstream of the secondary interception network 21 . Each first monitoring point 23 can be equipped with sonar, micro-organism monitoring unit, underwater video monitoring unit, etc. The scope of sonar monitoring should be able to cover the entire water intake section, and the micro-organism monitoring unit and underwater video monitoring unit are "point" monitoring. It is not necessary to cover the entire water intake section, but the setting points should be representative, usually arranged on the main inlet flow line of the open water intake channel. The "surface" monitoring of sonar is combined with the "points" of micro-biological monitoring units and underwater video monitoring units. Monitoring, using a "point-to-area" combined monitoring method to achieve all-weather real-time monitoring of marine life.

The open water intake channel is provided with a first access bridge that spans between its two revetments and corresponds to the position of the first pocket-type interception net 22; the first access bridge is mainly composed of a bridge deck, a pile foundation, etc. The bridge deck of the first access bridge is used for vehicle traffic, and the pile foundation is used for hanging the first net bag type interception net 22. Among the pile foundations below the first through-pass bridge, a through-flow span is formed between each two adjacent pile foundations, and each through-flow span is provided with a set of first pocket-type interception nets 22 .

The first net bag type interception net 22 is a three-dimensional net bag. The net bag adopts a three-piece structure, with a total width of up to 15m, a depth of up to 15m, and a length of up to 30m or more. It has a large flow area. Each set of the first net bag has a large flow area. The flow area of a bag-type interception net 22 is greater than 1000m ² , and the interception capacity of each set of the first bag-type interception net 22 is not less than 4.5 tons (marine organisms and floating objects, etc.). The mesh aperture of the first pocket-type interception net 22 can be selected between 20mm and 5mm according to the characteristics of disaster-causing objects. The main interception targets are small marine organisms and floating objects, and the continuous working time underwater is not less than 15 days. The mesh body of the first pocket-type interception net 22 is generally made of polymer polyethylene, nylon and other materials.

Each first net bag-type interception net 22 is equipped with a tension meter to monitor the stress of the cable in real time. The force of the cable indicates the total amount of marine life attached and intercepted by the first net bag-type interception net 22. According to the early warning value setting, arrangements can be made. Corresponding power plant actions.

On the bridge deck of the first access bridge, working points for mobile spraying devices can also be reserved. After the mobile spraying devices are transported to the bridge deck by vehicles, spraying operations are carried out on the bridge deck to achieve the disposal of microalgae.

The water area downstream of the first bag-type interception net 22 is the cleaning operation area 1, and the floating row 26 is arranged in the cleaning operation area 1, that is, located downstream of the first bag-type interception net 22. The floating row 26 is made of high molecular polyethylene material, can float on the water surface, and can move up and down freely with the tide level of the sea water.

The floating row 26 serves as a working platform for power plant personnel. On the floating row 26, the personnel can clean up the marine life, floating objects, etc. intercepted in the first pocket-type interception net 22. Floating row 26 can be applied to a variety of cleaning methods, such as manual cleaning or suction pump cleaning.

One end of the floating row 26 is provided with a debris transfer device 27. The debris transfer device 27 transfers marine organisms, floating objects and other debris cleaned from the first pocket-type interception net 22 to the shore, and finally carries out fishery recycling or ecological disposal. .

The first operating platform 28 is also located in the cleaning operation area 1, and is extended from a bank protection of the open water intake channel to the center direction of the open water intake channel. The first operating platform 28 is also located downstream of the first pocket-type interception net 22. Its elevation is higher than the average high tide level and serves as a working platform for docking of operating vessels and operation and maintenance personnel.

The first operating platform 28 is connected to the land area (the area connected to the revetment of the open water intake channel) through stairs and slides. The stairs are used for personnel passage, and the slides can be used for material transportation.

In order to monitor the head loss of water flowing through the secondary interception network 21 and the first pocket-type interception network 22, liquid level monitoring units 24 and 25 are respectively provided in front and behind the secondary interception network 21 and the first pocket-type interception network 22. Displays head loss data.

In the secondary interception unit 20, various monitoring signals such as sonar, microbiological monitoring unit, underwater video monitoring unit, first tension gauge, and liquid level monitoring units 24 and 25 in the first monitoring point 23 are all connected to the nuclear power plant cooling system. The source information comprehensive intelligent platform 50 performs display, storage and analysis work.

The three-level interception unit 30 may include a second pocket-type interception network 31 and at least one second monitoring point 32 .

The minimum mesh diameter of the second pocket-type interception net 31 can reach 2mm, and the main interception targets are small or extremely small marine organisms.

The open water intake channel is provided with a second access bridge that spans between its two revetments and corresponds to the position of the second pocket-type interception net 31; the second access bridge is mainly composed of pile platforms, pile foundations, etc. The pile platform of the second access bridge serves as a platform for personnel operations and equipment, and the pile foundation is used for hanging the second pocket-type interception net 31. Among the pile foundations below the second through-pass bridge, a through-flow span is formed between each two adjacent pile foundations, and each through-flow span is provided with a set of second pocket-type interception nets 31 .

The second net bag type interception net 31 is a three-dimensional net bag. The net bag adopts a three-part structure, with a total width of up to 15m, a depth of up to 15m, and a length of up to 30m or more. It has a large flow area. Each set of the first net bag has a large flow area. The flow area of the second pocket-type interception net 31 is greater than 1000m ² , and the interception capacity of each set of the second pocket-type interception net 31 is not less than 4.5 tons (marine organisms and floating objects, etc.).

When a 2mm second pocket-type interception net 31 is used, its underwater continuous working time is usually 1-2 days. According to needs, each set of the second net bag-type interception net 31 can be equipped with a tension meter to monitor the stress of the cable in real time. The force of the cable indicates the total amount of marine life attached and intercepted by the second net bag-type interception net 31. According to the early warning value settings, corresponding power plant actions can be scheduled.

Upstream of the second pocket-type interception network 31, at least one second monitoring point 32 can be set as needed. The second monitoring point 32 can be equipped with a sonar, a microbial monitoring unit and an underwater video monitoring unit. The functions can be referred to the first monitoring point. Point 23.

By comparing the number of marine life monitored by multiple monitoring units, the interception effect of each interception network on marine life can be analyzed, which can indicate the integrity of each interception network and facilitate timely maintenance operations at the power plant.

The water area downstream of the second net bag-type interception net 31 is the cleaning operation area 2. In the cleaning operation area 2, workers use surface vessels to clean up the marine life, floating objects, etc. intercepted by the second net bag-type interception net 31. The cleaning operation area 2 is provided with a second operating platform 33. The second operating platform 33 extends from a revetment of the open water intake channel toward the center of the open water intake channel. Its elevation is higher than the average high tide level and serves as a working platform for docking of operating vessels and operation and maintenance personnel. . The second operating platform 33 is connected to the land area through stairs and slides. The stairs are used for personnel passage, and the slides can be used for material transportation.

In the third-level interception unit 30, various monitoring signals such as sonar, microbiological monitoring unit, underwater video monitoring unit, and second tension gauge in the second monitoring point 32 are connected to the nuclear power plant cold source information comprehensive smart platform 50 for display. , storage and analysis work.

The fourth-level interception unit 40 includes a pocket net 41 . The pocket net 41 is used to intercept potentially damaged interceptor mesh pieces at all levels upstream to prevent the damaged interceptor mesh pieces from directly entering the water pump room of the nuclear power plant. The mesh aperture of the pocket bottom net 41 can be 100mm, and the material is usually a polymer polyethylene net.

The two ends of the pocket net 41 are respectively fixed on the shore-based anchor piers 102 on the two opposite banks of the water intake channel through cables. At the connection between the cable and the shore-based anchor piers 102 on both sides, a tension meter 42 can be set, and the tension signal of the tension meter 42 is connected. Enter the nuclear power plant cold source information comprehensive intelligent platform 50 for display, storage and analysis.

The nuclear power plant cold source comprehensive information smart platform 50 is used to store, analyze, display and alarm all access information in the water intake facilities, and can prompt the power plant operators to take actions.

Based on the received monitoring information, a total of three levels of early warning responses are set. The levels from low to high are cold source third-level response, cold source second-level response and cold source first-level response. Each level of response has the same Therefore, we must take appropriate actions to ensure the safety of cold sources in nuclear power plants by relying on the dual means of "technology + management".

The index name that represents the intensity of invasion of disaster-causing objects such as marine organisms and floating objects is "volume density of hazard-causing objects per unit of water intake" (equivalent to volume ratio), and the unit is (m ³ hazard-causing objects)/(m ³ water body), In the nuclear power plant cold source comprehensive information smart platform 50, the value of the disaster-causing object invasion intensity index can be displayed in real time, benchmarked against the initial setting value, and corresponding work instructions can be issued.

The nuclear power plant cold source comprehensive information smart platform 50 can establish an information interaction mechanism with the ocean monitoring center, meteorological department, government agencies, and nuclear power plant main control rooms. Under daily and emergency conditions, the nuclear power plant cold source comprehensive information smart platform 50 is a nuclear power plant The decision-making and command center for the cold source of the plant.

Based on the above, the present invention realizes the matrix relationship of two dimensions + one platform, as shown in Table 1 below.

Table 1

The nuclear power plant cold source safety comprehensive fortification system of the present invention can be adaptively adjusted after analysis according to different plant site conditions and disaster-causing intrusion characteristics, and its number does not need to be fixed.

The software and hardware facilities in the nuclear power plant cold source safety comprehensive fortification system of the present invention constitute a complete nuclear power plant permanent process system. The permanent process system covers the entire life cycle of the nuclear power plant design, construction and operation, and is synchronized with the construction of the nuclear power plant. It and the circulating water filtration system located in the water intake pump room form a complete water intake filtration system. System design manuals, system operation procedures, equipment operation and maintenance manuals, etc. need to be prepared to guide the operation and maintenance of cold source facilities in nuclear power plants.

The above are only examples of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the description and drawings of the present invention, or directly or indirectly applied to other related technologies fields are equally included in the scope of patent protection of the present invention.

Claims (19)

1. A nuclear power plant cold source safety comprehensive fortification system, which is characterized in that it includes a first-level interception unit, a second-level interception unit, a third-level interception unit and a fourth-level interception unit arranged in sequence according to the direction of water flow entering the nuclear power plant;

   The first-level interception unit includes a gate interception net arranged at the water intake, and at least two gate buoy monitoring units arranged outside the gate interception net corresponding to opposite sides of the water intake;

   The secondary interception unit includes secondary interception nets and a first pocket-type interception net arranged at intervals according to the direction of water flow, and is used to intercept seawater passing through the open water intake channel in a full-section;

   The three-level interception unit includes a second pocket-type interception net, the minimum mesh diameter of which is 2 mm;

   The four-level interception unit includes a pocket bottom net; both ends of the pocket bottom net are respectively fixed on two opposite banks of the open water intake channel through cables.
2. The nuclear power plant cold source safety comprehensive fortification system according to claim 1, characterized in that a predetermined height is left between the bottom of the door interception net and the water bottom, and the top of the door interception net is higher than the water surface; The aperture of the Shukou Gate interception net is 50mm-100mm.
3. The nuclear power plant cold source safety comprehensive fortification system according to claim 1, characterized in that the first-level interception unit further includes a mobile monitoring device arranged outside the door interception network;

   The mobile monitoring device includes a vessel carrying monitoring equipment.
4. The nuclear power plant cold source safety comprehensive fortification system according to claim 1, characterized in that the door buoy monitoring unit is a self-floating structure, and the equipment it carries includes water quality monitoring instruments, pH meters, thermometers, flow meters, At least one of sonar and in-situ imaging equipment.
5. The nuclear power plant cold source safety comprehensive fortification system according to claim 1, characterized in that the first-level interception unit also includes shore-based video monitoring units respectively arranged on the water intake breakwaters on both sides of the water intake; the shore-based The monitoring scope of the video monitoring unit covers the water intake and circulation waters including the water intake, the water intake harbor and the water intake open channel.
6. The nuclear power plant cold source safety comprehensive fortification system according to claim 1, characterized in that the first-level interception unit further includes at least one harbor buoy monitoring unit installed in the water intake harbor; the harbor buoy monitoring unit is It is used to monitor water quality parameters and marine life conditions in the water intake port area.
7. The nuclear power plant cold source safety comprehensive fortification system according to claim 1, characterized in that the first-level interception unit further includes a mobile spraying device arranged on the shore base of the open water intake channel;

   The mobile spraying device is used to spray disinfecting liquid into seawater to disinfect microalgae and produce an aggregation effect.
8. The nuclear power plant cold source safety comprehensive fortification system according to claim 1, characterized in that the first-level interception unit further includes a drive-off device arranged on the shore base of the open water intake channel;

   The driving away device is used to emit sound waves corresponding to the target organism and drive the target organism away from the water inlet.
9. The nuclear power plant cold source safety comprehensive fortification system according to claim 1, characterized in that the mesh aperture of the secondary interception network is 50mm; the secondary interception network is a flat network or a triangular network.
10. The nuclear power plant cold source safety comprehensive fortification system according to claim 1, characterized in that a first tension meter is provided on the cable of the secondary interception network, and the first tension meter is used to monitor the stress condition of the cable in real time. .
11. The nuclear power plant cold source safety comprehensive fortification system according to claim 1, characterized in that, the water intake open channel is provided with a third net connected across the two revetments and corresponding to the position of the first net pocket. A traffic bridge; among the pile foundations below the first traffic bridge, a flow span is formed between each two adjacent pile foundations, and each flow span is provided with a set of the first pocket-type interception net.
12. The nuclear power plant cold source safety comprehensive fortification system according to claim 1, characterized in that the secondary interception unit further includes at least two first monitoring points arranged upstream of the secondary interception network;

    Each first monitoring point is equipped with a sonar, a microbial monitoring unit and an underwater video monitoring unit.
13. The nuclear power plant cold source safety comprehensive fortification system according to claim 1, characterized in that the secondary interception unit further includes a floating row arranged downstream of the first pocket-type interception net.
14. The nuclear power plant cold source safety comprehensive fortification system according to claim 1, characterized in that the secondary interception unit further includes a pair of interceptors respectively provided upstream of the secondary interception network and downstream of the first net pocket interception network. Level monitoring unit.
15. The nuclear power plant cold source safety comprehensive fortification system according to claim 1, characterized in that the secondary interception unit further includes a first operating platform extending from a revetment of the water intake open channel toward the center of the water intake open channel; The first operating platform is located downstream of the first pocket-type interception net. Its elevation is higher than the average high tide level and serves as a working platform for docking of operating vessels and operation and maintenance personnel.
16. The nuclear power plant cold source safety comprehensive fortification system according to claim 1, characterized in that, the water intake open channel is provided with a third net connected across the two revetments and corresponding to the position of the second net pocket interception net. Two traffic bridges; among the pile foundations below the second traffic bridge, a flow span is formed between each two adjacent pile foundations, and each flow span is provided with a set of the second pocket-type interception net.
17. The nuclear power plant cold source safety comprehensive fortification system according to claim 1, characterized in that the three-level interception unit further includes at least one second monitoring point arranged upstream of the net pocket interception network;

    The second monitoring point is equipped with sonar, microbial monitoring unit and underwater video monitoring unit.
18. The nuclear power plant cold source safety comprehensive fortification system according to claim 1, characterized in that the three-level interception unit further includes a second operating platform extending from a revetment of the water intake open channel toward the center of the water intake open channel; The second operating platform is located downstream of the second pocket-type interception net. Its elevation is higher than the average high tide level and serves as a working platform for docking of operating vessels and operation and maintenance personnel.
19. The nuclear power plant cold source safety comprehensive fortification system according to any one of claims 1 to 18, characterized in that a second tension meter is provided on the cable of the bottom net, and the second tension meter is used to monitor the cable in real time. Stress conditions.

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