A layer-isolated nuclear power plant structure with impact resistance

Abstract

The present invention belongs to the field of earthquake and impact safety of nuclear power plants, and specifically discloses a new type of interlayer seismic isolation nuclear power plant structure with impact resistance function, including a nuclear island lower structure, a nuclear island upper structure, an interlayer seismic isolation layer, and nuclear equipment. The upper surface of the seismic isolation support is connected to the lower surface of the nuclear island upper structure by rollers. When an aircraft hits the nuclear island lower structure, the original design of the nuclear island lower part itself is relied on to resist the impact of the aircraft. When the aircraft hits the nuclear island upper structure, the impact sensor senses and opens the braking system of the anti-impact seismic isolation and vibration reduction layer. The impact energy of the aircraft is used to make the nuclear island upper structure rotate in a circle along the roller track, and the impact energy of the aircraft is converted into rotational kinetic energy. The rotational kinetic energy is converted into frictional heat energy through the friction plate, and the impact energy of the aircraft is converted into frictional heat energy, thereby reducing the damage to the nuclear island structure caused by the aircraft impact, thereby ensuring the safety of the nuclear island structure under the impact of the aircraft.

Description

Technical Field

[0001] The invention relates to the field of earthquake and impact safety of nuclear power plants, and in particular to a new type of interlayer seismic isolation nuclear power plant structure with impact resistance function. Background Art

[0002] Nuclear power generation is one of the clean, efficient and environmentally friendly energy sources, and is also a key development direction for my country's green energy. my country's 2021 "Government Work Report" mentioned "actively and orderly developing nuclear power on the premise of ensuring safety." "Ensuring safety" is the premise of "actively and orderly", mainly because nuclear power plant accidents can cause serious and long-term environmental pollution, major economic losses, and even serious social problems. Obviously, nuclear power plant safety is a key issue in nuclear power generation.

[0003] The safety of nuclear power plants has always been the focus of the development of the nuclear power plant industry. Therefore, the earthquake safety of nuclear power plants has always been the focus of research at home and abroad. Due to the complexity and uncertainty of earthquakes, it is difficult for current science and technology to accurately predict the time, location, magnitude and spectral characteristics of earthquakes. Japanese scholar Kawata Akira pointed out that even with the latest plate tectonic theory, it is impossible to obtain the seismic information necessary for building structure design. Academician Xie Lili also pointed out that many areas where strong earthquakes are not thought to be possible have experienced "unexpected earthquakes". For example, the 5.12 Wenchuan earthquake (M8.0) and the 3.11 Japan earthquake (M9.0) exceeded the design value. At the same time, the emergence of new potential earthquake faults will also affect the seismic safety of nuclear power plants. For example, Unit 1 of the Hamaoka Nuclear Power Plant in Japan was threatened by the potential threat of the Tokai Fault, and the design earthquake was increased from 0.45g to 1.0g. Due to the discovery of the new Hos-Gri fault, the design earthquake of the Diablo Canyon Nuclear Power Plant of PG&E in California, USA, was increased from 0.4g to 0.75g. At the same time, in the past decade, nuclear accidents related to earthquakes in Japan include: On August 16, 2005, the Onagawa Nuclear Power Plant suffered an earthquake exceeding the design S1 level, which shut down the reactor for 23 months; On March 25, 2007, the Yokogawa Nuclear Power Plant suffered an earthquake exceeding the design S1 level, which shut down the reactor for 14 months; In the same year, the Kariwa Nuclear Power Plant suffered an earthquake exceeding the design S2 level, causing water containing trace radioactive substances to leak and shut down the reactor for 24 months; On March 11, 2011, the Fukushima Nuclear Power Plant suffered the 9.0 magnitude 3.11 Japan earthquake, causing a magnitude 7 nuclear accident. On August 23, 2011, a 5.8 magnitude earthquake occurred on the east coast of the United States, causing 12 nuclear power plants near Virginia to feel the tremor, causing the shutdown of two nuclear reactors near the epicenter. Among them, the acceleration of the horizontal and vertical vibrations of the North Anna Nuclear Power Plant exceeded the design values. Although no nuclear accident occurred, cracks appeared in the walls inside the plant and the radioactive waste storage tanks also slipped. There is still a large gap between the seismic safety of traditional nuclear power plant structures and actual needs.

[0004] Passive seismic isolation and damping technology of structures meets the technical requirements of passive safety of third-generation nuclear power plants and is the development direction of seismic safety of nuclear power plant structures. Base isolated structure (BIS) has the advantages of high technical maturity, convenient use, effective isolation of seismic energy input to the upper structure of the nuclear island, reduction of structural seismic response, and reduction of structural seismic damage. It has been successfully applied to civil, transportation, bridge and other fields. However, due to the safety issues of nuclear equipment faced by base isolated nuclear power plants, the nuclear industry maintains a cautious attitude towards BIS NPPs. However, due to the key issues faced by BIS nuclear power plants: ① BIS structure is sensitive to sliding, pulse near-field and long-period earthquakes, and there is a risk of structural seismic failure under such earthquakes; ② The seismic displacement of the isolation bearing is large, which increases the risk of fracture of the connecting pipeline between the isolation part and the non-isolation part, and there is a hidden danger of failure of nuclear safety function; ③ BIS structure amplifies the seismic response of long-period structure and fluid sloshing mode, and increases the risk of seismic damage to key nuclear equipment, such as pressure vessels and piping systems; Therefore, the nuclear industry has adopted a cautious attitude towards BIS nuclear power plants. Obviously, studying the key issues facing BIS nuclear power plants has important research value.

[0005] In response to the problems existing in BIS nuclear power plants, domestic and foreign scholars have conducted a lot of research and achieved fruitful research results. Foreign scholars such as Italy's Forni, South Korea's Yoo and the United States' Whittaker, as well as my country's academicians Xie Lili, Zhou Fulin, Kong Xianjing and Lin Gao have advocated and applied seismic isolation technology to improve the seismic safety of nuclear power plants, and strived to solve the key problems that restrict base-isolated nuclear power plants. The landmark achievements are: ① In view of the sensitivity of base-isolated structures to sliding-type, pulse-type near-field, and long-period earthquake motions, Academician Xie Lili proposed to reduce the adverse effects of such earthquakes on base-isolated nuclear power plants through super-benchmark earthquake design; ② In view of the large relative displacement of the isolation layer, which increases the risk of fracture of the connecting pipes between the isolation part and the non-isolation part of the nuclear power plant, Forni proposed to use technical measures such as large deformation expansion nodes to alleviate the adverse effects of this factor. However, there is still a lack of in-depth research on problem ③. Xia Zufeng, Hou Gangling and others explored III +Based on the structural characteristics of the next-generation nuclear power reactor, the air intake of the passive safety function system of the nuclear power plant is applied. While maintaining the other parts of the structure unchanged, only the fixed connection between the nuclear island upper structure and the nuclear island lower structure of the air intake is replaced with a seismic isolation bearing. It can also be considered that the seismic isolation bearing of the BIS structure is moved upward from the foundation to the air intake at the top of the structure, forming a layered seismic isolation structure. At this time, the connecting pipe is located below the seismic isolation bearing, eliminating problem ②; the lower structure of the nuclear island belongs to the traditional non-seismic isolation structure, avoiding problem ③. At the same time, the structural optimization method is applied to better avoid the seismic failure of the structure. Since the structure meets the basic requirements of nuclear safety technology, has the advantages of clear shock absorption mechanism, simple and feasible implementation, etc., it has good application prospects.

[0006] Since the series of terrorist attacks on the World Trade Center in New York, USA on September 11, 2001, after the 9.11 incident, the U.S. Nuclear Regulatory Commission (NRC), China and the International Atomic Energy Agency have all regarded impact explosions as basic prevention and control events for nuclear power plant safety. The vibration characteristics of explosions can be described by three elements: amplitude, spectrum and duration. By comparing the three elements with and without a seismic isolation system, the impact of the explosion shock wave on the seismic isolation structure can be obtained. Whether in the vertical direction or the horizontal direction, the velocity peak-to-peak value of the experimental results with the seismic isolation system under the same amount of explosives is smaller than the velocity peak-to-peak value of the non-seismic isolation system; with the increase of the loading amount, the seismic isolation effect tends to be significant; the vibration peak-to-peak value in the horizontal direction is about 2 times larger than the peak-to-peak value in the vertical direction, and the seismic isolation structure has a similar vibration reduction effect in these two directions. Due to the different constraint stiffness in the horizontal and vertical directions, the vibration frequency in the vertical direction is high and the vibration amplitude in the horizontal direction is large. Whether it is vertical vibration or horizontal vibration, its main frequency is within 100HZ; vertical vibration has two main frequency areas, between 20-45HZ and between 55-75HZ, and the energy distribution of these two parts of frequency is equivalent. The main frequency of horizontal vibration is concentrated around 30HZ and presents a single-peak structure, indicating that horizontal vibration is mainly caused by low frequency, while vertical vibration has two main frequency areas. Whether in the vertical direction or the horizontal direction, the seismic isolation and vibration reduction system significantly reduces the amplitude of low-frequency vibration, which has a significant effect on structural shock absorption. However, under the action of direct impact load, the seismic isolation structure will produce large deformation or displacement, leading to accidents in nuclear power plants.

[0007] The interlayer seismic isolation bearings of the above interlayer seismic isolation structure have low stiffness, resulting in poor ability of the upper structure of the nuclear island to resist aircraft impact, and cannot meet the basic safety requirements of nuclear power plants to prevent aircraft impact accidents. Summary of the invention

[0008] The purpose of the present invention is to provide a new type of nuclear power plant structure with inter-layer seismic isolation having an impact resistance function, so as to solve the problems raised in the above-mentioned background technology.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a new type of interlayer seismic isolation nuclear power plant structure with impact resistance, comprising a nuclear island lower structure, a nuclear island upper structure, an interlayer seismic isolation layer and nuclear equipment, wherein the nuclear equipment is installed in the nuclear island lower structure, and the interlayer seismic isolation layer is connected between the nuclear island lower structure and the nuclear island upper structure, and comprises a seismic isolation support, a roller track, a roller shaft, a roller, a spring pull rod, a braking device, an impact sensor, an air hole and a friction plate.

[0010] Furthermore, the seismic isolation bearings are evenly spaced between the lower structure of the nuclear island and the upper structure of the nuclear island, and their cross-section is an "I"-shaped structure, and their upper and lower surfaces are respectively fixedly connected to the opposite surfaces of the lower structure of the nuclear island and the upper structure of the nuclear island, and spring pull rods are arranged on both sides of each of the seismic isolation bearings, one end of the spring pull rods is hinged to the top surface of the lower structure of the nuclear island, and the other end is hinged to the bottom surface of the upper structure of the nuclear island.

[0011] Furthermore, the friction plates are evenly spaced and distributed on both sides of the interlayer seismic isolation layer. The upper end of the friction plate is fixedly connected to the upper structure of the nuclear island, and the lower end thereof is overlapped with the lower structure of the nuclear island.

[0012] Furthermore, the roller shaft is fixedly connected to the upper surface of each seismic isolation support, and the roller sleeve is arranged on the roller shaft and can rotate around the roller shaft.

[0013] Furthermore, six rollers are arranged on the top of each of the seismic isolation supports and are arranged in a 2*3 pattern.

[0014] Furthermore, two roller tracks are provided and distributed on the inner and outer sides of the bottom surface of the nuclear island upper structure. The rollers are engaged with the corresponding roller tracks so that the nuclear island upper structure can rotate on the rollers along the roller tracks.

[0015] Furthermore, braking devices and impact sensors are provided on both sides of the roller. When not impacted, the braking device restricts the roller so that it cannot rotate. When the nuclear island upper structure 2 is impacted, the impact sensor senses and triggers the release of the braking device, allowing the roller to rotate around the roller axis.

[0016] Furthermore, the air holes are arranged between the friction plates to meet the exhaust pressure requirement.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention aims at the problem that the interlayer seismic isolation support of the interlayer seismic isolation structure has a small stiffness, resulting in poor ability of the upper structure of the nuclear island to resist aircraft impact, and cannot meet the basic safety requirements of the nuclear power plant to prevent aircraft impact accidents. The invention exploits the circular plane structure characteristics of the nuclear power plant to convert impact energy into rotational kinetic energy; at the same time, through the circular plane motion process, the centrifugal force and the linear motion characteristics are applied to make the aircraft impact object fly away from the upper structure, thereby reducing the impact on the upper structure of the nuclear island; and the relative relative motion between the upper structure of the nuclear island and the lower structure of the nuclear island generated during the rotation process is applied to convert the rotational kinetic energy into frictional heat energy through the friction plate, and convert the aircraft impact energy into frictional heat energy; at the same time, the braking system is applied to stop the movement of the upper structure, and the braking system is combined with a spring pull rod to avoid the rolling of the ball and the relative displacement of the upper structure, thereby ensuring the shock-absorbing effect of the interlayer seismic isolation structure, and the shock-absorbing characteristics of the interlayer seismic isolation structure will not be affected when there is wind load or earthquake action; the present invention changes the traditional structure that adopts a resistance method to prevent aircraft impact damage to an energy conversion method to prevent aircraft impact damage, and at the same time uses rotation to deflect the impact direction represented by the aircraft, thereby reducing the transmission of impact energy to the structure.

[0019] In summary, the present invention uses energy conversion, friction energy consumption and geometric motion characteristics to reduce the damage to the nuclear island structure caused by aircraft impact, thereby ensuring the safety of the nuclear island structure under aircraft impact. The results of the present invention have research and practical value for the development of interlayer seismic isolation structures, the impact damage resistance of nuclear facility structures, and the improvement of the safety of nuclear facilities against earthquakes and impacts. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural cross-sectional view of the present invention;

[0021] Figure 2 It is a schematic diagram of the overall structure of the seismic isolation support of the present invention;

[0022] Figure 3 It is the AA cross-sectional view of the present invention;

[0023] Figure 4 It is the BB cross-sectional view of the present invention;

[0024] Figure 5 is a cross-sectional view of the seismic isolation support of the present invention;

[0025] Figure 6 It is a CC cross-sectional view of the present invention;

[0026] Figure 7 It is a detailed diagram of position E in the braking state of the present invention;

[0027] Figure 8 It is a detailed diagram of position E in the motion state of the present invention;

[0028] Fig. 9 This is a detailed diagram of F of the present invention.

[0029] In the figure: 1. Lower structure of nuclear island; 2. Upper structure of nuclear island; 3. Interlayer seismic isolation layer; 301. Seismic isolation support; 302. Roller track; 303. Roller shaft; 304. Roller; 305. Spring pull rod; 306. Braking device; 307. Impact sensor; 308. Air hole; 309. Friction plate; 4. Nuclear equipment. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0031] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] See also Figure 1-9 The present invention provides a technical solution: a new type of interlayer seismic isolation nuclear power plant structure with impact resistance function, including a nuclear island lower structure 1, a nuclear island upper structure 2, an interlayer seismic isolation layer 3 and nuclear equipment 4, the nuclear equipment 4 is installed in the nuclear island lower structure 1, the interlayer seismic isolation layer 3 is connected between the nuclear island lower structure 1 and the nuclear island upper structure 2, and includes a seismic isolation support 301, a roller track 302, a roller shaft 303, a roller 304, a spring pull rod 305, a braking device 306, an impact sensor 307, an air hole 308 and a friction plate 309.

[0034] Embodiment 1: The seismic isolation bearings 301 are evenly spaced between the lower structure 1 of the nuclear island and the upper structure 2 of the nuclear island, and their cross-sections are in an "I"-shaped structure, and their upper and lower surfaces are respectively fixedly connected to the opposite surfaces of the lower structure 1 of the nuclear island and the upper structure 2 of the nuclear island, and spring pull rods 305 are arranged on both sides of each of the seismic isolation bearings 301, one end of the spring pull rods 305 is hinged to the top surface of the lower structure 1 of the nuclear island, and the other end is hinged to the bottom surface of the upper structure 2 of the nuclear island. The spring pull rod 305 is in a pre-tensioned state under normal conditions, tightening the nuclear island upper structure 2 and the nuclear island lower structure 1; when not impacted, since the horizontal stiffness of the spring of the spring pull rod 305 is much smaller than the vertical stiffness, the nuclear island upper structure 2 can have a larger displacement in the horizontal plane relative to the nuclear island lower structure 1 to meet the deformation requirements of the seismic isolation bearing 301; when impacted, the spring of the spring pull rod 305 is disconnected from the rod member, releasing the force on the structure, and the contraction of the spring will not affect the rotation of the nuclear island upper structure 2.

[0035] Embodiment 2: The friction plates 309 are evenly spaced on both sides of the inner and outer layers of the interlayer seismic isolation layer 3, the upper end of the friction plates 309 is fixedly connected to the nuclear island upper structure 2, and the lower end thereof is overlapped with the nuclear island lower structure 1. When the nuclear island upper structure 2 rotates, the lower part of the friction plates 309 and the nuclear island lower structure 1 are relatively displaced, thereby converting the rotational kinetic energy of the nuclear island upper structure 2 into frictional heat energy.

[0036] Embodiment 3: The roller shaft 303 is fixedly connected to the upper surface of each seismic isolation support 301, and the roller 304 is sleeved on the roller shaft 303 and can rotate around the roller shaft 303. Six rollers 304 are arranged on the top of each seismic isolation support 301, and are arranged in a 2*3 pattern.

[0037] There are two roller tracks 302 , which are distributed on the inner and outer sides of the bottom surface of the nuclear island superstructure 2 . The rollers 304 are engaged with the corresponding roller tracks 302 , so that the nuclear island superstructure 2 can rotate on the rollers 304 along the roller tracks 302 .

[0038] Embodiment 4: Braking devices 306 and impact sensors 307 are provided on both sides of the roller 304. The braking device 306 is a brake which is uniformly controlled by a controller. When not impacted, the braking device 306 restricts the roller 304 so that it cannot rotate. When the nuclear island upper structure 2 is impacted, the impact sensor 307 senses and triggers the release of the braking device 306, so that the roller 304 can rotate around the roller axis 303.

[0039] Furthermore, the air holes 308 are arranged between the friction plates 309 to meet the exhaust pressure requirement.

[0040] In summary, the present invention can make the upper structure 2 of the nuclear island rotate relative to the interlayer seismic isolation layer 3, thereby achieving the purpose of improving the impact resistance of the nuclear power plant using interlayer seismic isolation technology by converting energy and reducing the transmission of impact energy to the structure.

[0041] Specific:

[0042] In the non-impact state, the upper part of the seismic isolation support 301 is rigidly connected to the seismic isolation support 301 by combining the brake device 306 with the spring pull rod 305. The spring pull rod 305 is arranged on both sides of the seismic isolation support 301, and its lower end is hinged to the upper surface of the nuclear island lower structure 1, and its upper end is hinged to the lower surface of the nuclear island upper structure 2. At this time, the spring pull rod 305 is in a pre-tensioned state, which can ensure that the nuclear island upper structure 2, the interlayer seismic isolation layer 3 and the nuclear island lower structure 1 are in a tightly connected state and prevent tensile damage. The brake device 306 is arranged on the upper surface of the seismic isolation support 301 and is placed on both sides of the roller 304 to prevent the roller 304 and the nuclear island upper structure 2 from relative movement, and prevent wind load from causing damage, while ensuring that the roller 304 transmits pressure to prevent compressive damage. Through the combined effect of the tension of the spring pull rod 305 and the pressure transmitted by the roller 304, the overall bending damage and overturning damage of the structure are achieved.

[0043] Under the action of earthquake, at this time, the brake device 306 is still in working state, preventing the roller 304 and the nuclear island upper structure 2 from relative movement, ensuring that the roller 304 transmits the earthquake pressure. The spring pull rod 305 starts to work, transmitting the earthquake tension between the nuclear island upper structure 2 and the nuclear island lower structure 1, and reducing the tension of the seismic isolation support 301. The seismic isolation support 301 can transmit the seismic pressure between the nuclear island upper structure 2 and the nuclear island lower structure 1. Under the action of the horizontal shear force of the earthquake, the seismic isolation support 301 needs to undergo a large shear deformation to play a shock absorbing role. At this time, the spring pull rod 305 is hingedly connected to the upper surface of the nuclear island lower structure 1 and the lower surface of the nuclear island upper structure 2 to form a horizontal mechanism structure, avoiding large shear deformation of the seismic isolation support 301, but does not affect the transmission of tension through the spring pull rod 305. At this time, the spring pull rod 305 and the roller 304-seismic isolation support 301 work together to transmit pressure to prevent structural bending damage and overturning damage.

[0044] Under the action of impact load, the impact sensor 307 is used for sensing and judgment. When the impact load is small or acts on the lower structure 1 of the nuclear island, the braking device 306 and the spring pull rod 305 are in working state, and a resistance method is adopted to prevent impact damage; when the impact load is large, the braking device 306 is closed and the spring pull rod 305 is disconnected. The braking device 306 and the spring pull rod 305 will not hinder the rotation of the upper structure 2 of the nuclear island, so that the upper structure 2 of the nuclear island can rotate.

[0045] Under the action of the impact force, the nuclear island upper structure 2 rotates. During the rotational movement, the roller 304 rotates around the roller shaft 303. The roller 304 around the circular nuclear island upper structure 2 moves in the same direction around the roller shaft 303, so that the impact energy acting on the nuclear island upper structure 2 is converted into rotational kinetic energy. The roller tracks 302 are arranged on the upper surface of the isolation support 301 and the lower surface of the nuclear island lower structure 1 to prevent the running rotation from deviating from the circular predetermined trajectory. In the rotational motion state, relative movement between the nuclear island upper structure 2 and the nuclear island lower structure 1 will occur. On both sides of the isolation support 301, a number of friction plates 309 are arranged. When the nuclear island upper structure 2 rotates, the friction plates 309 use the displacement difference between the nuclear island upper structure 2 and the nuclear island lower structure 1 to convert the rotational kinetic energy of the nuclear island upper structure 2 into friction energy. The nuclear island superstructure 2 has a circular plane feature. When the nuclear island superstructure 2 rotates, centrifugal force is generated, and the linear motion characteristics of the object are applied to deflect the impact direction represented by the aircraft to a certain extent, thereby reducing the transfer of impact energy to the structure.

[0046] This technical solution ensures the realization and operation of the new structure of the new nuclear power plant with isolation and rotational impact resistance in this layer under normal conditions, earthquakes and impacts, and achieves the expected goals.

[0047] It is worth noting that the entire device is controlled by a main control button. Since the device matched with the control button is a common device and belongs to the existing mature technology, its electrical connection relationship and specific circuit structure will not be described in detail here.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A nuclear power plant structure with inter-layer seismic isolation and shock resistance, characterized in that: The invention comprises a nuclear island lower structure (1), a nuclear island upper structure (2), an interlayer seismic isolation layer (3) and nuclear equipment (4), wherein the nuclear equipment (4) is installed in the nuclear island lower structure (1), and the interlayer seismic isolation layer (3) is connected between the nuclear island lower structure (1) and the nuclear island upper structure (2), and comprises a seismic isolation support (301), a roller track (302), a roller shaft (303), a roller (304), a spring pull rod (305), a braking device (306), an impact sensor (307), an air hole (308) and a friction plate (309); The seismic isolation supports (301) are evenly spaced between the lower structure (1) and the upper structure (2) of the nuclear island, and their cross-section is an "I"-shaped structure, and their upper and lower surfaces are respectively fixedly connected to the opposite surfaces of the lower structure (1) and the upper structure (2) of the nuclear island. A spring pull rod (305) is arranged on both sides of each of the seismic isolation supports (301), one end of the spring pull rod (305) is hinged to the top surface of the lower structure (1) of the nuclear island, and the other end is hinged to the bottom surface of the upper structure (2) of the nuclear island; the friction plates (309) are evenly spaced on both sides of the inner and outer sides of the interlayer seismic isolation layer (3), the upper end of the friction plate (309) is fixedly connected to the upper structure (2) of the nuclear island, and the lower end of the friction plate (309) is fixedly connected to the upper structure (2) of the nuclear island. The roller shaft (303) is fixedly connected to the upper surface of each seismic isolation support (301), and the roller (304) is sleeved on the roller shaft (303) and can rotate around the roller shaft (303); brake devices (306) and impact sensors (307) are arranged on both sides of the roller (304). When not impacted, the brake device (306) restricts the roller (304) so ​​that it cannot rotate. When the nuclear island upper structure (2) is impacted, the impact sensor (307) senses and triggers the brake device (306) to release, so that the roller (304) can rotate around the roller shaft (303).

2. The inter-layer seismic isolation nuclear power plant structure with impact resistance according to claim 1, characterized in that: Six rollers (304) are arranged on the top of each of the seismic isolation supports (301) in a 2*3 arrangement.

3. The inter-layer seismic isolation nuclear power plant structure with impact resistance according to claim 1, characterized in that: The roller tracks (302) are provided with two and are distributed on the inner and outer sides of the bottom surface of the nuclear island upper structure (2). The rollers (304) and the corresponding roller tracks (302) are mutually engaged, so that the nuclear island upper structure (2) can rotate on the rollers (304) along the roller tracks (302).

4. The inter-layer seismic isolation nuclear power plant structure with impact resistance according to claim 1 is characterized in that: The air holes (308) are arranged between the friction plates (309) to meet the exhaust pressure requirement.

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