Multi-protection matrix type nuclear island estuary explosion-proof safety system

Abstract

The invention discloses a multi-protection matrix type nuclear island estuary anti-explosion safety system, and relates to the technical field of anti-explosion safety, and the system comprises a nuclear reactor, the upper end of which is provided with a nuclear island water inlet pipe, and the lower end of which is provided with a nuclear island water outlet pipe; the matrix type nuclear island entrance protection unit is communicated with the nuclear island water inlet pipe; the matrix type nuclear island sea outlet protection unit is communicated with the nuclear island water outlet pipe; the nuclear island seaport main bodies are fixedly arranged at one ends, far away from the nuclear reactor, of the matrix type nuclear island seaport protection unit and the matrix type nuclear island seaport protection unit; the monitoring fences are arranged at the entrance and the exit, so that the surrounding environment can be monitored in real time, when the monitoring fences detect explosive waves, the plug body is controlled to quickly plug the nuclear island seaport main body encountering the explosive waves, the explosive waves can timely relieve pressure from the pressure relief culvert, and the explosion-proof effect is achieved. Explosive waves can be effectively prevented from entering the nuclear reactor, and the emergency response speed is greatly increased.

Description

Technical Field

[0001] The invention relates to the technical field of explosion-proof safety, in particular to a multi-protection matrix nuclear island sea entrance explosion-proof safety system. Background Art

[0002] In the field of nuclear power generation, nuclear island estuary explosion prevention refers to a series of explosion prevention measures taken at the estuary of the nuclear island (i.e. the area where the nuclear reactor and its ancillary facilities are located) in a nuclear power plant. It is mainly responsible for effectively sealing the nuclear reactor when an abnormal situation occurs outside the nuclear reactor, such as an explosion, to prevent the explosion wave from impacting the nuclear reactor, thereby protecting the environment and public safety.

[0003] The existing device has limited ability to close the main body of the estuary in an emergency situation and cannot respond to emergencies quickly and effectively. Once an emergency occurs, such as an explosion wave impact, the main body of the estuary cannot be quickly restored to normal operation after being closed, affecting the safe operation of the nuclear power plant; in addition, the existing device usually only has a single main body of the estuary. When an explosion wave occurs, if the single main body of the estuary needs to be closed, the cooling water supply will be interrupted, thereby affecting the normal operation of the nuclear reactor; secondly, after the main body of the estuary is closed, the existing device cannot clean the filter plate at the estuary position. The blockage of the filter plate will reduce the flow of cooling water, thereby affecting the cooling effect.

[0004] Therefore, it is necessary to provide a multi-protection matrix nuclear island sea entrance explosion-proof safety system to solve the technical problems raised in the above background technology. Summary of the invention

[0005] In view of the above problems, the present invention provides a multi-protection matrix nuclear island sea entrance explosion-proof safety system, which is capable of real-time monitoring of the surrounding environment by arranging monitoring fences at both the sea entrance and the sea outlet. When the monitoring fence detects the explosion wave, it can immediately feed back the information to the central control unit, and the central control unit quickly responds according to the monitoring result, and controls the plug to quickly seal the main body of the nuclear island sea entrance that encounters the explosion wave. The explosion wave can be decompressed in time from the pressure relief culvert, which can effectively prevent the explosion wave from entering the nuclear reactor, greatly improving the emergency response speed. After the explosion wave disappears, the main body of the nuclear island sea entrance at this position can quickly return to its initial state, thereby ensuring the normal operation of the nuclear reactor.

[0006] To achieve the above object, the present invention provides the following technical solution: a multi-protection matrix nuclear island sea entrance explosion-proof safety system, which includes:

[0007] A nuclear reactor, wherein at least one nuclear island water inlet pipe for supplying cooling water to the nuclear reactor is disposed at its upper end, and at least one nuclear island water outlet pipe for discharging water after heat exchange of the nuclear reactor is disposed at its lower end, and the nuclear island water inlet pipe is connected to the nuclear island water outlet pipe;

[0008] A matrix-type nuclear island sea inlet protection unit, connected to the nuclear island water inlet pipe;

[0009] A matrix-type nuclear island sea outlet protection unit, connected to the nuclear island outlet pipe;

[0010] The nuclear island seaport body is configured as a plurality of them, all of which are fixedly arranged at one end of the matrix-type nuclear island sea inlet protection unit and the matrix-type nuclear island sea outlet protection unit away from the nuclear reactor, and the nuclear island seaport body is a continuous structure of a horizontal section-a 90° bend section-a vertical section, and pressure relief culverts are fixedly arranged on both sides of the vertical section of the nuclear island seaport body, and the pressure relief culverts are all arranged in the sea, and the pressure relief culverts are all connected to the nuclear island seaport body, and the lower ends of the nuclear island seaport body and the pressure relief culvert in contact with water are both provided with an annular groove, wherein a movable upper limit buffer unit and a lower limit buffer unit are installed in the annular groove, a filter plate movable along the annular groove is installed between the upper limit buffer unit and the lower limit buffer unit, a monitoring fence is fixedly installed in the pressure relief culvert between the annular groove in the pressure relief culvert and the connection position with the nuclear island seaport body, and the monitoring fence is fixedly installed in the annular groove in the nuclear island seaport body and the connection position with the pressure relief culvert body; and

[0011] The explosion-proof units are arranged corresponding to the number of the nuclear island main bodies, and the explosion-proof units are fixedly arranged at the upper end of the 90° bend section of the nuclear island main body. A longitudinal through hole is opened at the connecting position between the nuclear island main body and the explosion-proof units.

[0012] In a possible implementation, the matrix-type nuclear island sea inlet protection unit includes a nuclear island water inlet connecting pipe connected to the nuclear island water inlet pipe, the nuclear island water inlet connecting pipe is provided with a sea inlet one-way main valve and a sea inlet circulating main water pump, a primary U-shaped sea inlet water pipe is fixedly provided on the nuclear island water inlet connecting pipe away from the nuclear reactor, both ends of the primary U-shaped sea inlet water pipe are provided with a sea inlet primary single valve and a sea inlet primary circulating water pump, and both ends of the primary U-shaped sea inlet water pipe away from the nuclear reactor are provided with a A secondary U-shaped sea inlet water pipe is fixedly arranged, and both ends of the secondary U-shaped sea inlet water pipe are equipped with a secondary sea inlet single valve and a secondary sea inlet circulating water pump. Both ends of the secondary U-shaped sea inlet water pipe away from the nuclear reactor are fixedly arranged with a tertiary U-shaped sea inlet water pipe, and both ends of the tertiary U-shaped sea inlet water pipe are equipped with a tertiary sea inlet single valve and a tertiary sea inlet circulating water pump, and both ends of the tertiary U-shaped sea inlet water pipe away from the nuclear reactor are fixedly arranged with the nuclear island sea inlet body.

[0013] In a possible implementation, the matrix-type nuclear island sea outlet protection unit comprises a nuclear island outlet water connecting pipe connected to the nuclear island water inlet pipe, the nuclear island outlet water connecting pipe is provided with an outlet one-way main valve and an outlet circulating main water pump, a primary U-shaped sea outlet water pipe is fixedly provided on the nuclear island outlet water connecting pipe away from the nuclear reactor, both ends of the primary U-shaped sea outlet water pipe are provided with an outlet first-level single valve and an outlet first-level circulating water pump, and both ends of the primary U-shaped sea outlet water pipe away from the nuclear reactor are A secondary U-shaped sea outlet water pipe is fixedly arranged, and both ends of the secondary U-shaped sea outlet water pipe are equipped with a secondary sea outlet single valve and a secondary sea outlet circulating water pump, and both ends of the secondary U-shaped sea outlet water pipe away from the nuclear reactor are fixedly arranged with a tertiary U-shaped sea outlet water pipe, and both ends of the tertiary U-shaped sea outlet water pipe are equipped with a tertiary sea outlet single valve and a tertiary sea outlet circulating water pump, and both ends of the tertiary U-shaped sea outlet water pipe away from the nuclear reactor are fixedly arranged with the nuclear island sea outlet body.

[0014] In a possible implementation, the Haikou explosion-proof unit includes:

[0015] A waterproof box, at least two U-shaped locks are installed at the lower end of which are used to fix the waterproof box to the main body of the nuclear island seaport;

[0016] A mounting seat body is fixedly disposed in the waterproof box body, a driving motor is fixedly disposed on one side of the upper end of the mounting seat body, an output end of the driving motor is fixed to a rotating shaft, the rotating shaft is rotatably disposed on the upper end of the mounting seat body, a deflection wheel body is fixedly disposed between the rotating shafts located inside the mounting seat body, and a crank shaft is rotatably disposed between the deflection wheel bodies; and

[0017] A connecting rod, the upper end of which is hinged to the lower end of the crank shaft and can be vertically movably arranged in the mounting seat body, and a plug body is fixedly arranged at the lower end of the connecting rod. The plug body and the connecting rod can be vertically movably arranged in the waterproof box body, the longitudinal through hole and the nuclear island seaport body.

[0018] In a possible implementation, the outer diameter of the plug body is equal to the inner diameter of the nuclear island seaport body, and the plug body is vertically movably arranged in the 90° bend section and the vertical section of the nuclear island seaport body.

[0019] In a possible implementation, the upper limit buffer unit includes an upper ring body having an outer diameter equal to the inner diameter of the annular groove in the nuclear island seaport body and the pressure relief culvert, and a plurality of upper limit buffer springs are evenly fixedly arranged on the circumference of the upper end of the upper ring body.

[0020] In a possible implementation, the lower limit buffer unit includes a lower ring body whose outer diameter is equal to the inner diameter of the annular groove in the nuclear island seaport body and the pressure relief culvert, and a plurality of lower limit buffer springs are evenly fixed on the circumference of the lower end of the lower ring body.

[0021] In a possible implementation, the upper limit buffer spring located in the nuclear island seaport body can be limit-set at the upper end of the annular groove located in the nuclear island seaport body, the lower limit buffer spring located in the nuclear island seaport body can be limit-set at the lower end of the annular groove located in the nuclear island seaport body, the upper limit buffer spring located in the pressure relief culvert can be limit-set at the upper end of the annular groove located in the pressure relief culvert, and the lower limit buffer spring located in the pressure relief culvert can be limit-set at the lower end of the annular groove located in the pressure relief culvert.

[0022] In a possible implementation, the outer diameter of the filter plate located in the nuclear island seaport body is equal to the inner diameter of the annular groove located in the nuclear island seaport body, the outer diameter of the filter plate located in the pressure relief culvert is equal to the inner diameter of the annular groove located in the pressure relief culvert, and a plurality of filter holes are evenly penetrated in the axial direction of the filter plate.

[0023] In a possible implementation, the monitoring fences are all connected to the central control unit, and the central control unit is all connected to the drive motor, the estuary one-way main valve, the connected estuary circulating main water pump, the estuary first-level single valve, the estuary first-level circulating water pump, the estuary second-level single valve, the estuary second-level circulating water pump, the estuary third-level single valve, the estuary third-level circulating water pump, the outlet one-way main valve, the connected outlet circulating main water pump, the outlet first-level single valve, the outlet first-level circulating water pump, the outlet second-level single valve, the outlet second-level circulating water pump, the outlet third-level single valve, and the outlet third-level circulating water pump.

[0024] Compared with the prior art, the present invention provides a multi-protection matrix nuclear island sea entrance explosion-proof safety system, which has the following beneficial effects:

[0025] 1. The present invention is capable of real-time monitoring of the surrounding environment by arranging monitoring fences at both the estuary and the outlet. When the monitoring fence detects the explosion wave, it can immediately feed back the information to the central control unit. The central control unit quickly responds according to the monitoring result, and controls the plug to quickly seal the main body of the nuclear island seaport that encounters the explosion wave. The explosion wave can be decompressed in time from the pressure relief culvert, which can effectively prevent the explosion wave from entering the nuclear reactor, greatly improving the emergency response speed. After the explosion wave disappears, the main body of the nuclear island seaport at this position can quickly return to its initial state, thereby ensuring the normal operation of the nuclear reactor.

[0026] 2. The present invention adopts the design of a matrix-type U-shaped inlet body and an outlet body, as well as redundant configuration of a one-way valve and a circulating water pump. When a certain component fails, the system can still operate normally, thereby improving the overall reliability of the system. The matrix-type structural design enables the system to quickly continue to supply water through other inlets and outlets when impacted by an explosion wave, thereby ensuring that the cooling of the nuclear reactor is not affected. At the same time, since the system has a redundant design, the faulty components can be maintained or replaced without stopping the system, thereby simplifying the maintenance work.

[0027] 3. In the process of the plug body sealing the vertical section of the main body of the nuclear island seaport of the present invention, water flow is pushed out along the main body, which can automatically clean the filter plate at the main body mouth without human intervention. At the same time, the filter plate drives the lower ring body to move in coordination. Under the action of the lower limit buffer spring, the filter plate vibrates after the lower limit buffer spring contacts with the lower end of the annular groove, which can further help remove impurities on the surface of the filter plate and improve the cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention.

[0029] Figure 1 It is a schematic diagram of the internal cross-sectional structure of a nuclear reactor in a multi-protection matrix nuclear island sea entrance explosion-proof safety system;

[0030] Figure 2 It is a schematic diagram of the top view of the structure of a matrix-type sea inlet protection unit in a multi-protection matrix-type nuclear island sea inlet explosion-proof safety system;

[0031] Figure 3 It is a schematic diagram of the top view of the structure of a matrix outlet protection unit in a multi-protection matrix nuclear island outlet explosion-proof safety system;

[0032] Figure 4 It is a structural schematic diagram of the main body of the nuclear island sea entrance in a multi-protection matrix nuclear island sea entrance explosion-proof safety system;

[0033] Figure 5 It is a structural schematic diagram of the Haikou explosion-proof unit in a multi-protection matrix nuclear island sea entrance explosion-proof safety system;

[0034] Figure 6 for Figure 5 A schematic diagram of the enlarged structure at A in the middle;

[0035] Figure 7 It is a schematic diagram of the internal structure of the Haikou explosion-proof unit in a multi-protection matrix nuclear island sea entrance explosion-proof safety system;

[0036] Figure 8 It is a structural schematic diagram of an upper limit buffer unit in a multi-protection matrix nuclear island sea entrance explosion-proof safety system;

[0037] Fig. 9 It is a structural schematic diagram of a lower limit buffer unit in a multi-protection matrix nuclear island sea entrance explosion-proof safety system;

[0038] Fig.10 It is a structural schematic diagram of a filter plate in a multi-protection matrix nuclear island sea entrance explosion-proof safety system;

[0039] Figure numerals: 1, nuclear reactor; 2, nuclear island water inlet pipe; 3, nuclear island water outlet pipe; 4, matrix nuclear island sea inlet protection unit; 411, nuclear island water inlet connecting pipe; 412, sea inlet one-way main valve; 413, sea inlet circulating main water pump; 414, primary U-shaped sea inlet water pipe; 415, sea inlet primary single valve; 416, sea inlet primary circulating water pump; 417, secondary U-shaped sea inlet water pipe; 418, inlet Seaport secondary single valve; 419, estuary secondary circulating water pump; 421, tertiary U-shaped seaport water pipe; 422, estuary tertiary single valve; 423, estuary tertiary circulating water pump; 5, matrix nuclear island seaport protection unit; 511, nuclear island outlet water connection pipe; 512, seaport one-way main valve; 513, seaport circulating main water pump; 514, primary U-shaped seaport water pipe; 515, seaport primary single valve; 516, first-stage circulating water pump at the outlet; 517, second-stage U-shaped outlet water pipe; 518, second-stage single valve at the outlet; 519, second-stage circulating water pump at the outlet; 521, third-stage U-shaped outlet water pipe; 522, third-stage single valve at the outlet; 523, third-stage circulating water pump at the outlet; 6, main body of the nuclear island outlet; 61, longitudinal through hole; 7, pressure relief culvert; 8, explosion-proof unit at the outlet; 81, waterproof box; 82, U Type lock; 83, mounting seat body; 84, driving motor; 85, rotating shaft; 86, deflection wheel body; 87, crank shaft; 88, connecting rod; 89, plug body; 9, annular groove; 10, upper limit buffer unit; 101, upper ring body; 102, upper limit buffer spring; 11, lower limit buffer unit; 111, lower ring body; 112, lower limit buffer spring; 12, filter plate; 121, filter hole; 13, monitoring fence. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0042] See also Figure 1-Figure 10 The embodiment of the present invention provides a multi-protection matrix nuclear island sea entrance explosion-proof safety system, which includes:

[0043] A nuclear reactor 1, wherein at least one nuclear island water inlet pipe 2 for supplying cooling water to the nuclear reactor 1 is disposed at its upper end, and at least one nuclear island water outlet pipe 3 for discharging water after heat exchange of the nuclear reactor 1 is disposed at its lower end, and the nuclear island water inlet pipe 2 is connected to the nuclear island water outlet pipe 3;

[0044] A matrix-type nuclear island sea inlet protection unit 4, connected to the nuclear island water inlet pipe 2;

[0045] A matrix-type nuclear island sea outlet protection unit 5 is connected to the nuclear island outlet pipe 3;

[0046] The nuclear island seaport body 6 is configured as a plurality of them, all of which are fixedly arranged at one end of the matrix-type nuclear island sea inlet protection unit 4 and the matrix-type nuclear island sea outlet protection unit 5 away from the nuclear reactor 1, and the nuclear island seaport body 6 is a continuous structure of a horizontal section-a 90° bend section-a vertical section, and pressure relief culverts 7 are fixedly arranged on both sides of the vertical section of the nuclear island seaport body 6, and the pressure relief culverts 7 are all arranged in the sea, and the pressure relief culverts 7 are all connected to the nuclear island seaport body 6, and an annular groove 9 is provided inside the lower end of the nuclear island seaport body 6 and the pressure relief culvert 7 in contact with water, so A movable upper limit buffer unit 10 and a lower limit buffer unit 11 are installed in the annular groove 9, a filter plate 12 movable along the annular groove 9 is installed between the upper limit buffer unit 10 and the lower limit buffer unit 11, a monitoring fence 13 is fixedly installed in the pressure relief culvert 7 between the annular groove 9 in the pressure relief culvert 7 and the connection position with the nuclear island seaport body 6, and the monitoring fence 13 is fixedly installed in the annular groove 9 in the nuclear island seaport body 6 and the connection position with the pressure relief culvert 7; and

[0047] The explosion-proof units 8 are arranged corresponding to the number of the nuclear island explosion-proof bodies 6, and the explosion-proof units 8 are fixedly arranged at the upper end of the 90° bend section of the nuclear island explosion-proof body 6. A longitudinal through hole 61 is opened at the connecting position between the nuclear island explosion-proof body 6 and the explosion-proof units 8.

[0048] Based on the above technical scheme, the nuclear island seaport body 6 and the pressure relief culvert 7 are prefabricated by templates, upper limit buffer units 10, filter plates 12 and lower limit buffer units 11 according to the design drawings of the nuclear island components, that is, the nuclear island seaport body 6 and the pressure relief culvert 7 are prefabricated with an annular groove 9 by templates, upper limit buffer units 10, filter plates 12 and lower limit buffer units 11, and the upper limit buffer unit 10, filter plates 12 and lower limit buffer units 11 are installed in the annular groove 9. After the nuclear island seaport body 6 and the pressure relief culvert 7 are formed, the template is taken out, and the staff enters the nuclear island seaport body 6 and the pressure relief culvert 7 to grind the inner side of the annular groove 9 and install the monitoring fence 13 in the nuclear island seaport body 6 and the pressure relief culvert 7. The staff then installs the nuclear reactor 1 in the corresponding manner according to the design drawings of the nuclear island, and reserves the nuclear island water inlet pipe 2 and the nuclear island water outlet pipe 3, and A matrix-type nuclear island sea inlet protection unit 4 and a matrix-type nuclear island sea outlet protection unit 5 are installed at corresponding positions, and then the matrix-type nuclear island sea inlet protection unit 4 and the matrix-type nuclear island sea outlet protection unit 5 are fixed to the nuclear island sea outlet body 6 on the side away from the nuclear reactor 1, and then the sea outlet explosion-proof unit 8 is fixedly arranged on the nuclear island sea outlet body 6 in sequence, and the matrix-type nuclear island sea inlet protection unit 4 is connected to the nuclear island water inlet pipe 2, and the matrix-type nuclear island sea outlet protection unit 5 is connected to the nuclear island water outlet pipe 3; when the monitoring fence 13 detects the explosion wave, the sea outlet explosion-proof unit 8 blocks the nuclear island sea outlet body 6, and the explosion wave enters the nuclear island sea outlet body 6 along the vertical section of the nuclear island sea outlet body 6 and is then decompressed along the pressure relief culvert 7; when the monitoring fence 13 does not detect the explosion wave subsequently, the sea outlet explosion-proof unit 8 no longer blocks the nuclear island sea outlet body 6, so that the nuclear island sea outlet body 6 is connected to the nuclear reactor 1.

[0049] On the basis of the above technical scheme, by arranging monitoring fences 13 at both the estuary and the outlet, the surrounding environment can be monitored in real time. When the monitoring fence 13 detects the explosion wave, it can respond quickly according to the monitoring result, and control the sea mouth explosion-proof unit 8 to quickly block the nuclear island sea mouth main body 6 encountering the explosion wave. The explosion wave can be decompressed in time from the pressure relief culvert 7, which can effectively prevent the explosion wave from entering the nuclear reactor 1, greatly improving the emergency response speed. After the explosion wave disappears, the nuclear island sea mouth main body 6 at this position can quickly return to its initial state, thereby ensuring the normal operation of the nuclear reactor 1.

[0050] In a possible embodiment, the matrix-type nuclear island sea inlet protection unit 4 includes a nuclear island water inlet connecting pipe 411 connected to the nuclear island water inlet pipe 2, and the nuclear island water inlet connecting pipe 411 is provided with a sea inlet one-way main valve 412 and a sea inlet circulating main water pump 413, and a first-level U-shaped sea inlet water pipe 414 is fixedly provided on the nuclear island water inlet connecting pipe 411 away from the nuclear reactor 1, and both ends of the first-level U-shaped sea inlet water pipe 414 are provided with a sea inlet first-level single valve 415 and a sea inlet first-level circulating water pump 416, and both ends of the first-level U-shaped sea inlet water pipe 414 away from the nuclear reactor 1 are provided with a first-level single valve 415 and a first-level circulating water pump 416. A secondary U-shaped sea inlet water pipe 417 is fixedly provided, and a secondary sea inlet single valve 418 and a secondary sea inlet circulating water pump 419 are installed at both ends of the secondary U-shaped sea inlet water pipe 417, and a tertiary U-shaped sea inlet water pipe 421 is fixedly provided at both ends of the secondary U-shaped sea inlet water pipe 417 away from the nuclear reactor 1, and a tertiary sea inlet single valve 422 and a tertiary sea inlet circulating water pump 423 are installed at both ends of the tertiary U-shaped sea inlet water pipe 421, and both ends of the tertiary U-shaped sea inlet water pipe 421 away from the nuclear reactor 1 are fixedly provided with the nuclear island sea inlet body 6.

[0051] Using the above technical solution, the staff installs the nuclear island water inlet connecting pipe 411 at the corresponding position according to the design drawings, installs the sea inlet one-way main valve 412 and the sea inlet circulating main water pump 413 on the nuclear island water inlet connecting pipe 411, fixes the first-level U-shaped sea inlet water pipe 414 to the nuclear island water inlet connecting pipe 411, and then installs the sea inlet first-level single valve 415 and the sea inlet first-level circulating water pump 416 on the first-level U-shaped sea inlet water pipe 414, and then installs the first-level U-shaped sea inlet water pipe 414 on the first-level U-shaped sea inlet water pipe. Secondary U-shaped estuary water passage pipes 417 are fixedly installed at both ends of channel 414, and a secondary estuary single valve 418 and a secondary estuary circulating water pump 419 are installed on each secondary U-shaped estuary water passage pipe 417. Then, tertiary U-shaped estuary water passage pipes 421 are fixedly installed at both ends of each secondary U-shaped estuary water passage pipe 417, and a tertiary estuary single valve 422 and a tertiary estuary circulating water pump 423 are installed on each tertiary U-shaped estuary water passage pipe 421.

[0052] In a possible embodiment, the matrix-type nuclear island sea outlet protection unit 5 includes a nuclear island outlet water connecting pipe 511 connected to the nuclear island water inlet pipe 2, and the nuclear island outlet water connecting pipe 511 is provided with an outlet one-way main valve 512 and an outlet circulating main water pump 513, and a first-level U-shaped sea outlet water pipe 514 is fixedly provided on the nuclear island outlet water connecting pipe 511 away from the nuclear reactor 1, and both ends of the first-level U-shaped sea outlet water pipe 514 are provided with an outlet first-level single valve 515 and an outlet first-level circulating water pump 516, and both ends of the first-level U-shaped sea outlet water pipe 514 away from the nuclear reactor 1 A secondary U-shaped sea outlet water pipe 517 is fixedly provided, and a secondary sea outlet single valve 518 and a secondary sea outlet circulating water pump 519 are installed at both ends of the secondary U-shaped sea outlet water pipe 517, and a tertiary sea outlet water pipe 521 is fixedly provided at both ends of the secondary U-shaped sea outlet water pipe 517 away from the nuclear reactor 1, and a tertiary sea outlet single valve 522 and a tertiary sea outlet circulating water pump 523 are installed at both ends of the tertiary U-shaped sea outlet water pipe 521, and both ends of the tertiary U-shaped sea outlet water pipe 521 away from the nuclear reactor 1 are fixedly provided with the nuclear island sea outlet body 6.

[0053] Through the above technical solution, after the staff completes the installation of the matrix-type nuclear island sea inlet protection unit 4, they install the nuclear island outlet water connecting pipe 511 at the corresponding position, and then fix the first-level U-shaped sea outlet water pipe 514 to the nuclear island outlet water connecting pipe 511, and then install the first-level sea outlet single valve 515 and the first-level sea outlet circulating water pump 516 on the first-level U-shaped sea outlet water pipe 514, and then fix the second-level U-shaped sea outlet water pipe 514 at both ends. The U-shaped outlet water pipe 517 is installed, and the outlet secondary single valve 518 and the outlet secondary circulating water pump 519 are installed on each secondary U-shaped outlet water pipe 517. Then, the tertiary U-shaped outlet water pipe 521 is fixedly installed at both ends of each secondary U-shaped outlet water pipe 517, and the outlet tertiary single valve 522 and the outlet tertiary circulating water pump 523 are installed on each tertiary U-shaped outlet water pipe 521. The two ends of the pipeline 421 and the three-level U-shaped outlet water pipe 521 are fixed to the nuclear island seaport body 6, and the seaport explosion-proof unit 8 is fixedly arranged on the nuclear island seaport body 6 in sequence; when a single valve or a circulating water pump fails, taking the failure of a certain seaport three-level single valve 422 or a seaport three-level circulating water pump 423 on the three-level U-shaped seaport water pipe 421 as an example, the suction of the seaport secondary circulating water pump 419 connected to the three-level U-shaped seaport water pipe 421 increases, and the working state of the seaport three-level circulating water pump 423 installed at other positions on the three-level U-shaped seaport water pipe 421 remains unchanged, and the working state of the seaport secondary circulating water pump 419 at other positions remains unchanged, thereby ensuring that the amount of cooling water entering the nuclear reactor 1 remains unchanged, that is, when a single valve or circulating water pump at other positions fails, the central control unit preferentially controls the suction of the upper-level circulating water pump to increase.

[0054] At the same time, it should be noted that the number of one-way valves and the number of circulating water pumps in the matrix-type nuclear island sea inlet protection unit 4 or the matrix-type nuclear island sea outlet protection unit 5 in the above-mentioned hierarchical relationship satisfy the following mathematical logical relationship:

[0055] y=2 x

[0056] p=2 x

[0057] Where: x————pipeline level number;

[0058] y————the corresponding number of one-way valves;

[0059] p————the corresponding number of circulating water pumps;

[0060] As for the number of seaport explosion-proof units 8 at the matrix-type nuclear island seaport protection unit 4 or the matrix-type nuclear island seaport protection unit 5 in the above-mentioned hierarchical relationship, the following mathematical logical relationship is satisfied:

[0061] Z=2 x (x≥3)

[0062] Where: x————pipeline level number;

[0063] Z————the number of corresponding Haikou explosion-proof units 8;

[0064] On the basis of the above technical scheme, through the design of the matrix-type U-shaped inlet body and outlet body, and the redundant configuration of the one-way valve and the circulating water pump, when a component fails, the system can still operate normally, thereby improving the overall reliability of the system. The matrix-type structural design enables the system to continue to supply water quickly through other inlets and outlets when impacted by an explosion wave, thereby ensuring that the cooling of the nuclear reactor 1 is not affected. At the same time, since the system has a redundant design, the faulty components can be maintained or replaced without stopping the system, thereby simplifying the maintenance work.

[0065] In a possible implementation, the explosion-proof unit 8 includes:

[0066] A waterproof box 81, at least two U-shaped locks 82 are installed at its lower end, and the U-shaped locks 82 are used to fix the waterproof box 81 and the nuclear island seaport body 6;

[0067] A mounting seat body 83 is fixedly disposed in the waterproof box body 81, a driving motor 84 is fixedly disposed on one side of the upper end of the mounting seat body 83, an output end of the driving motor 84 is fixed to a rotating shaft 85, the rotating shaft 85 is rotatably disposed at the upper end of the mounting seat body 83, a deflection wheel body 86 is fixedly disposed between the rotating shafts 85 located inside the mounting seat body 83, and a crank shaft 87 is rotatably disposed between the deflection wheel bodies 86; and

[0068] A connecting rod 88, the upper end of which is hinged to the lower end of the crank shaft 87 and can be vertically movably arranged in the mounting seat body 83, and a plug body 89 is fixedly arranged at the lower end. The plug body 89 and the connecting rod 88 can be vertically movably arranged in the waterproof box body 81, the longitudinal through hole 61 and the nuclear island seaport body 6.

[0069] By adopting the above technical solution, the driving motor 84 drives the rotating shaft 85 and the deflection wheel body 86 to rotate during the rotation process, so that the crank shaft 87 drives the plug body 89 to perform reciprocating motion in the vertical direction.

[0070] In a possible embodiment, the outer diameter of the plug 89 is equal to the inner diameter of the nuclear island seaport body 6, and the plug 89 is vertically movably arranged in the 90° bend section and the vertical section of the nuclear island seaport body 6. When the plug 89 descends along the longitudinal through hole 61 and the vertical section of the nuclear island seaport body 6, the plug 89 can block the vertical section of the nuclear island seaport body 6; the plug 89 rises along the longitudinal through hole 61 and the vertical section of the nuclear island seaport body 6 and moves away from the nuclear island seaport body 6, so that the nuclear island seaport body 6 can be connected with the nuclear reactor 1.

[0071] In a possible embodiment, the upper limit buffer unit 10 includes an upper ring body 101 whose outer diameter is equal to the inner diameter of the annular groove 9 in the nuclear island seaport body 6 and the pressure relief culvert 7. The upper ring body 101 in the nuclear island seaport body 6 and the pressure relief culvert 7 can be limitedly moved in the corresponding annular groove 9, and a plurality of upper limit buffer springs 102 are evenly fixedly arranged on the circumference of the upper end of the upper ring body 101.

[0072] In a possible embodiment, the lower limit buffer unit 11 includes a lower ring body 111 whose outer diameter is equal to the inner diameter of the annular groove 9 in the nuclear island seaport body 6 and the pressure relief culvert 7. The lower ring body 111 in the nuclear island seaport body 6 and the pressure relief culvert 7 can be limited and moved in the corresponding annular groove 9, and a plurality of lower limit buffer springs 112 are evenly fixedly arranged on the circumference of the lower end of the lower ring body 111.

[0073] In a possible embodiment, the upper limit buffer spring 102 located in the nuclear island seaport body 6 can be limited and clamped at the upper end of the annular groove 9 located in the nuclear island seaport body 6, and the lower limit buffer spring 112 located in the nuclear island seaport body 6 can be limited and clamped at the lower end of the annular groove 9 located in the nuclear island seaport body 6. The upper limit buffer spring 102 located in the pressure relief culvert 7 can be limited and clamped at the upper end of the annular groove 9 located in the pressure relief culvert 7, and the lower limit buffer spring 112 located in the pressure relief culvert 7 can be limited and clamped at the lower end of the annular groove 9 located in the pressure relief culvert 7.

[0074] Through the above technical scheme, the upper limit buffer unit 10 is arranged at the matrix-type nuclear island sea entrance protection unit 4. Under the action of the circulating water pumps at each sea entrance, the water pressure forces the upper limit buffer unit 10, the filter plate 12 and the lower limit buffer unit 11 to contact the upper end of the annular groove 9, and the upper limit buffer spring 102 can effectively reduce the collision between the upper ring body 101, the filter plate 12 and the lower limit buffer unit 11 and the upper end of the annular groove 9.

[0075] In a possible embodiment, the outer diameter of the filter plate 12 located in the nuclear island seaport body 6 is equal to the inner diameter of the annular groove 9 located in the nuclear island seaport body 6, the outer diameter of the filter plate 12 located in the pressure relief culvert 7 is equal to the inner diameter of the annular groove 9 located in the pressure relief culvert 7, and a plurality of filter holes 121 are uniformly penetrated in the axial direction of the filter plate 12.

[0076] By adopting the above technical scheme, when the vertical section of the nuclear island seaport body 6 is blocked and the pressure is released, the plug 89 pushes out the water flow in the vertical section of the nuclear island seaport body 6, and pushes the upper ring body 101, filter plate 12, and lower ring body 111 in the nuclear island seaport body 6 and the pressure relief culvert 7 along the annular groove 9, and cleans the filter hole 121 under the dual effects of the impact of the water flow and the vibration of the lower limit buffer spring 112.

[0077] On the basis of the above technical solution, when the plug 89 blocks the vertical section of the nuclear island seaport main body 6, the water flow is pushed out along the main body, and the filter hole 121 at the main body mouth can be automatically cleaned without human intervention. At the same time, the filter plate 12 drives the lower ring body 111 to move in coordination. Under the action of the lower limit buffer spring 112, the filter plate 12 vibrates after the lower limit buffer spring 112 contacts the lower end of the annular groove 9, which can further help remove impurities on the surface of the filter plate 12, improve the cleaning efficiency, and also reduce the collision between the upper limit buffer unit 10, the filter plate 12 and the lower ring body 111 and the lower end of the annular groove 9.

[0078] In a possible implementation, the monitoring fences 13 are all connected to the central control unit, and the central control unit is all connected to the drive motor 84, the estuary one-way main valve 412, the connected estuary circulating main water pump 413, the estuary first-level single valve 415, the estuary first-level circulating water pump 416, the estuary second-level single valve 418, the estuary second-level circulating water pump 419, the estuary third-level single valve 422, the estuary third-level circulating water pump 423, the outlet one-way main valve 512, the connected outlet circulating main water pump 513, the outlet first-level single valve 515, the outlet first-level circulating water pump 516, the outlet second-level single valve 518, the outlet second-level circulating water pump 519, the outlet third-level single valve 522, and the outlet third-level circulating water pump 523.

[0079] It should be noted that when a single valve or a circulating water pump fails, the central control unit will give priority to controlling the suction of the upper-level circulating water pump to increase; when the monitoring fence 13 detects the explosion wave, it will feedback to the central control unit, and the central control unit will control the drive motor 84 to rotate, so that the plug 89 blocks the vertical section of the nuclear island seaport body 6; when the monitoring fence 13 does not subsequently detect the explosion wave, it will feedback to the central control unit, and the central control unit will control the drive motor 84 to rotate, so that the plug 89 is away from the vertical section of the nuclear island seaport body 6, so as to maintain the water flow of the nuclear island seaport body 6.

[0080] During the specific implementation, firstly, the main body 6 of the nuclear island seaport and the pressure relief culvert 7 are prefabricated by means of templates, upper limit buffer units 10, filter plates 12 and lower limit buffer units 11 according to the design drawings of the nuclear island components, that is, the main body 6 of the nuclear island seaport and the pressure relief culvert 7 are prefabricated with an annular groove 9 by means of templates, upper limit buffer units 10, filter plates 12 and lower limit buffer units 11, and the upper limit buffer units 10, filter plates 12 and lower limit buffer units 11 are arranged in the annular groove 9. After the main body 6 of the nuclear island seaport and the pressure relief culvert 7 are formed, the template is taken out, and the staff enters the main body 6 of the nuclear island seaport and the pressure relief culvert 7 to grind the inner side of the annular groove 9 flat, and installs the monitoring fence 13 in the main body 6 of the nuclear island seaport and the pressure relief culvert 7. Then, the staff further adjusts the pressure relief culvert 7 according to the design drawings of the nuclear island components. According to the design drawings, a nuclear reactor 1 is installed in the corresponding position, and a nuclear island water inlet pipe 2 and a nuclear island water outlet pipe 3 are reserved, and a nuclear island water inlet connecting pipe 411 is installed at the corresponding position, and an inlet one-way main valve 412 and an inlet circulating main water pump 413 are installed on the nuclear island water inlet connecting pipe 411, and a first-level U-shaped inlet water pipe 414 is fixed to the nuclear island water inlet connecting pipe 411, and then an inlet first-level single valve 415 and an inlet first-level circulating water pump 416 are installed on the first-level U-shaped inlet water pipe 414, and then a second-level U-shaped inlet water pipe 417 is fixedly installed at both ends of the first-level U-shaped inlet water pipe 414, and an inlet second-level single valve 418 and an inlet second-level circulating water pump 416 are installed on the second-level U-shaped inlet water pipe 417. 19, then the third-level U-shaped sea inlet water pipe 421 is fixedly installed at both ends of each second-level U-shaped sea inlet water pipe 417, and the third-level sea inlet single valve 422 and the third-level sea inlet circulating water pump 423 are installed on the third-level U-shaped sea inlet water pipe 421, and then the nuclear island outlet water connecting pipe 511 is installed at the corresponding position, and then the first-level U-shaped sea outlet water pipe 514 is fixed to the nuclear island outlet water connecting pipe 511, and then the first-level sea outlet single valve 515 and the first-level sea outlet circulating water pump 516 are installed on the first-level U-shaped sea outlet water pipe 514, and then the second-level U-shaped sea outlet water pipe 517 is fixedly installed at both ends of the first-level U-shaped sea outlet water pipe 514, and the second-level U-shaped sea outlet water pipe 517 is installed on the second-level U-shaped sea outlet water pipe 517 The second-level single valve 518 and the second-level circulating water pump 519 of the sea outlet are then fixedly installed at the two ends of each second-level U-shaped sea outlet water pipe 517. The three-level single valve 522 and the three-level circulating water pump 523 of the sea outlet are installed on the three-level U-shaped sea outlet water pipe 521. Then, the two ends of each three-level U-shaped sea inlet water pipe 421 and the three-level U-shaped sea outlet water pipe 521 are fixed to the nuclear island sea outlet body 6, and then the sea outlet explosion-proof unit 8 is fixedly set on the nuclear island sea outlet body 6 in sequence, and the plug body 89 is corresponding to the longitudinal through hole 61. Finally, the nuclear island water inlet connecting pipe 411 is connected to the nuclear island water inlet pipe 2, and the nuclear island water outlet connecting pipe 511 is connected to the nuclear island water outlet pipe 3;

[0081] When a single valve or a circulating water pump fails, for example, when a certain estuary three-stage single valve 422 or a estuary three-stage circulating water pump 423 on the three-stage U-shaped estuary water pipe 421 fails, the suction of the estuary secondary circulating water pump 419 connected to the three-stage U-shaped estuary water pipe 421 increases, and the working state of the estuary three-stage circulating water pump 423 installed at other positions on the three-stage U-shaped estuary water pipe 421 remains unchanged, and the working state of the estuary secondary circulating water pump 419 at other positions remains unchanged, ensuring that the amount of cooling water entering the nuclear reactor 1 remains unchanged, that is, when a single valve or circulating water pump at other positions fails, the central control unit preferentially controls the suction of the upper-level circulating water pump to increase;

[0082] When the monitoring fence 13 detects the explosion wave, it is fed back to the central control unit, and the central control unit controls the driving motor 84 to rotate, and the plug 89 moves along the longitudinal through hole 61 and the vertical section of the nuclear island seaport body 6 and blocks the nuclear island seaport body 6. The explosion wave enters the nuclear island seaport body 6 along the vertical section of the nuclear island seaport body 6 and is then decompressed along the plug 89 and the pressure relief culvert 7. In the process of decompression, the vertical section of the nuclear island seaport body 6 is blocked, and the plug 89 pushes the water flow in the vertical section of the nuclear island seaport body 6 out of the nuclear island seaport body 6. The upper ring body 101, the filter plate 12, and the lower ring body 111 in the pressure relief culvert 7 are pushed along the annular groove 9, and the filter hole 121 is cleaned under the dual effects of the impact of the water flow and the vibration of the lower limit buffer spring 112; when the monitoring fence 13 does not subsequently monitor the explosion wave, feedback is given to the central control unit, and the central control unit controls the drive motor 84 to rotate, and the plug body 89 is along the longitudinal through hole 61 and the vertical section of the nuclear island seaport body 6 and away from the nuclear island seaport body 6, and the nuclear island seaport body 6 is connected to the nuclear reactor 1.

[0083] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-protection matrix nuclear island sea entrance explosion-proof safety system, characterized in that: include: A nuclear reactor (1), wherein at least one nuclear island water inlet pipe (2) is provided at its upper end for supplying cooling water into the nuclear reactor (1), and at least one nuclear island water outlet pipe (3) is provided at its lower end for discharging water after heat exchange in the nuclear reactor (1), and the nuclear island water inlet pipe (2) is in communication with the nuclear island water outlet pipe (3); A matrix-type nuclear island sea inlet protection unit (4), which is connected to the nuclear island water inlet pipe (2); A matrix-type nuclear island sea outlet protection unit (5) is connected to the nuclear island water outlet pipe (3); The nuclear island seaport body (6) is configured as a plurality of parts, all of which are fixedly arranged at one end of the matrix-type nuclear island seaport protection unit (4) and the matrix-type nuclear island seaport protection unit (5) away from the nuclear reactor (1), and the nuclear island seaport body (6) is a continuous structure of a horizontal section-a 90° bend section-a vertical section, and pressure relief culverts (7) are fixedly arranged on both sides of the vertical section of the nuclear island seaport body (6), and the pressure relief culverts (7) are arranged in the sea, and the pressure relief culverts (7) are connected to the nuclear island seaport body (6), and the lower ends of the nuclear island seaport body (6) and the pressure relief culvert (7) in contact with water are both provided with an annular groove (9), and the annular groove A movable upper limit buffer unit (10) and a lower limit buffer unit (11) are installed in the groove (9); a filter plate (12) movable along the annular groove (9) is installed between the upper limit buffer unit (10) and the lower limit buffer unit (11); a monitoring fence (13) is fixedly installed in the pressure relief culvert (7) between the annular groove (9) in the pressure relief culvert (7) and the connection position with the nuclear island sea port body (6); and the monitoring fence (13) is fixedly installed in the nuclear island sea port body (6) between the annular groove (9) in the nuclear island sea port body (6) and the connection position with the pressure relief culvert (7); and The explosion-proof units (8) are arranged in accordance with the number of the nuclear island explosion-proof bodies (6), and the explosion-proof units (8) are fixedly arranged at the upper end of the 90° bend section of the nuclear island explosion-proof body (6), and a longitudinal through hole (61) is provided at the connection position between the nuclear island explosion-proof body (6) and the explosion-proof units (8).

2. A multi-protection matrix nuclear island sea entrance explosion-proof safety system according to claim 1, characterized in that: The matrix-type nuclear island sea inlet protection unit (4) comprises a nuclear island water inlet connecting pipe (411) connected to the nuclear island water inlet pipe (2); the nuclear island water inlet connecting pipe (411) is provided with a sea inlet one-way main valve (412) and a sea inlet circulating main water pump (413); a first-level U-shaped sea inlet water passage pipe (414) is fixedly provided on the nuclear island water inlet connecting pipe (411) away from the nuclear reactor (1); both ends of the first-level U-shaped sea inlet water passage pipe (414) are provided with a first-level sea inlet single valve (415) and a first-level sea inlet circulating water pump (416); both ends of the first-level U-shaped sea inlet water passage pipe (414) away from the nuclear reactor (1) are fixedly provided with a first-level sea inlet single valve (415) and a first-level sea inlet circulating water pump (416); A secondary U-shaped sea inlet water pipe (417) is provided, and both ends of the secondary U-shaped sea inlet water pipe (417) are provided with a secondary sea inlet single valve (418) and a secondary sea inlet circulating water pump (419). Both ends of the secondary U-shaped sea inlet water pipe (417) away from the nuclear reactor (1) are fixedly provided with a tertiary U-shaped sea inlet water pipe (421), and both ends of the tertiary U-shaped sea inlet water pipe (421) are provided with a tertiary sea inlet single valve (422) and a tertiary sea inlet circulating water pump (423), and both ends of the tertiary U-shaped sea inlet water pipe (421) away from the nuclear reactor (1) are fixedly provided with the nuclear island sea inlet body (6).

3. The multi-protection matrix nuclear island sea entrance explosion-proof safety system according to claim 1 is characterized by: The matrix-type nuclear island sea outlet protection unit (5) comprises a nuclear island water outlet connecting pipe (511) connected to the nuclear island water inlet pipe (2); a sea outlet one-way main valve (512) and a sea outlet circulating main water pump (513) are installed on the nuclear island water outlet connecting pipe (511); a first-level U-shaped sea outlet water pipe (514) is fixedly arranged on the nuclear island water outlet connecting pipe (511) away from the nuclear reactor (1); a sea outlet first-level single valve (515) and a sea outlet first-level circulating water pump (516) are installed at both ends of the first-level U-shaped sea outlet water pipe (514) away from the nuclear reactor (1); A secondary U-shaped sea outlet water pipe (517) is provided, and both ends of the secondary U-shaped sea outlet water pipe (517) are provided with a secondary sea outlet single valve (518) and a secondary sea outlet circulating water pump (519). Both ends of the secondary U-shaped sea outlet water pipe (517) away from the nuclear reactor (1) are fixedly provided with a tertiary U-shaped sea outlet water pipe (521), and both ends of the tertiary U-shaped sea outlet water pipe (521) are provided with a tertiary sea outlet single valve (522) and a tertiary sea outlet circulating water pump (523), and both ends of the tertiary U-shaped sea outlet water pipe (521) away from the nuclear reactor (1) are fixedly provided with the nuclear island sea outlet body (6).

4. The multi-protection matrix nuclear island sea entrance explosion-proof safety system according to claim 1 is characterized by: The Haikou explosion-proof unit (8) comprises: A waterproof box (81) having at least two U-shaped latches (82) mounted at its lower end, the U-shaped latches (82) being used to fix the waterproof box (81) to the nuclear island seaport body (6); A mounting seat (83) is fixedly arranged in the waterproof box (81); a driving motor (84) is fixedly arranged on one side of the upper end of the mounting seat (83); an output end of the driving motor (84) is fixed to a rotating shaft (85); the rotating shaft (85) is rotatably arranged at the upper end of the mounting seat (83); a deflection wheel body (86) is fixedly arranged between the rotating shaft (85) located inside the mounting seat (83); a crank shaft (87) is rotatably arranged between the deflection wheel bodies (86); and A connecting rod (88), the upper end of which is hinged to the lower end of the crank shaft (87) and can be vertically movably arranged in the mounting seat body (83), and a plug body (89) is fixedly arranged at the lower end of the connecting rod (88), and the plug body (89) and the connecting rod (88) can be vertically movably arranged in the waterproof box body (81), the longitudinal through hole (61) and the nuclear island seaport body (6).

5. A multi-protection matrix nuclear island sea entrance explosion-proof safety system according to claim 4, characterized in that: The outer diameter of the plug body (89) is equal to the inner diameter of the nuclear island seaport body (6), and the plug body (89) is vertically movably arranged in the 90° bend section and the vertical section of the nuclear island seaport body (6).

6. The multi-protection matrix nuclear island sea entrance explosion-proof safety system according to claim 1 is characterized by: The upper limit buffer unit (10) comprises an upper ring body (101) whose outer diameter is equal to the inner diameter of the annular groove (9) in the nuclear island seaport body (6) and the pressure relief culvert (7), and a plurality of upper limit buffer springs (102) are evenly fixedly arranged on the circumference of the upper end of the upper ring body (101).

7. A multi-protection matrix nuclear island sea entrance explosion-proof safety system according to claim 6, characterized in that: The lower limit buffer unit (11) comprises a lower ring body (111) whose outer diameter is equal to the inner diameter of the annular groove (9) in the nuclear island seaport body (6) and the pressure relief culvert (7), and a plurality of lower limit buffer springs (112) are evenly fixedly arranged on the circumference of the lower end of the lower ring body (111).

8. The multi-protection matrix nuclear island sea entrance explosion-proof safety system according to claim 7 is characterized by: The upper limit buffer spring (102) located in the nuclear island seaport body (6) can be limit-locked at the upper end of the annular groove (9) located in the nuclear island seaport body (6); the lower limit buffer spring (112) located in the nuclear island seaport body (6) can be limit-locked at the lower end of the annular groove (9) located in the nuclear island seaport body (6); the upper limit buffer spring (102) located in the pressure relief culvert (7) can be limit-locked at the upper end of the annular groove (9) located in the pressure relief culvert (7); the lower limit buffer spring (112) located in the pressure relief culvert (7) can be limit-locked at the lower end of the annular groove (9) located in the pressure relief culvert (7).

9. The multi-protection matrix nuclear island sea entrance explosion-proof safety system according to claim 1 is characterized by: The outer diameter of the filter plate (12) located in the nuclear island seaport body (6) is equal to the inner diameter of the annular groove (9) located in the nuclear island seaport body (6), the outer diameter of the filter plate (12) located in the pressure relief culvert (7) is equal to the inner diameter of the annular groove (9) located in the pressure relief culvert (7), and a plurality of filter holes (121) are uniformly penetrated in the axial direction of the filter plate (12).

10. The multi-protection matrix nuclear island sea entrance explosion-proof safety system according to claim 4 is characterized by: The monitoring fences (13) are all connected to the central control unit, and the central control unit is connected to the drive motor (84), the one-way main valve at the sea inlet (412), the connected main circulating water pump at the sea inlet (413), the first-level single valve at the sea inlet (415), the first-level circulating water pump at the sea inlet (416), the second-level single valve at the sea inlet (418), the second-level circulating water pump at the sea inlet (419), the third-level single valve at the sea inlet (422), the third-level circulating water pump at the sea inlet (423), the one-way main valve at the sea outlet (512), the connected main circulating water pump at the sea outlet (513), the first-level single valve at the sea outlet (515), the first-level circulating water pump at the sea outlet (516), the second-level single valve at the sea outlet (518), the second-level circulating water pump at the sea outlet (519), the third-level single valve at the sea outlet (522), and the third-level circulating water pump at the sea outlet (523).

Images