Spent fuel assembly container

Abstract

The invention discloses a spent fuel assembly container. The spent fuel assembly container comprises a sealing barrel and a damping assembly. An exhaust hole is formed in the cylinder wall of the open end of the sealing cylinder, a water filling hole is formed in the cylinder wall of the closed end of the sealing cylinder, and valves are arranged on the exhaust hole and the water filling hole; the open end and the closed end of the sealing cylinder are provided with trunnions and damping assemblies. The open end of the sealing cylinder body forms a connector capable of being in butt joint with the discharging position of the EPR unit through a trunnion at the open end, a damping assembly at the open end and an exhaust hole. The closed end of the sealing cylinder forms an interface which can be in butt joint with a water filling and discharging structure or an air filling and discharging structure and container transfer equipment of the EPR unit through a trunnion at the closed end, a damping assembly at the closed end and a water filling hole, so that the butt joint of the in-field transfer sealing cylinder and the EPR unit spent fuel transfer facility and equipment is realized; and an available container is provided for in-site transportation and off-site transportation of the spent fuel of the EPR unit, and the problems in the field are solved.

Description

Technical Field

[0001] This application relates to the field of nuclear power plant technology, and in particular to a spent fuel assembly container. Background Technology

[0002] Spent fuel, also known as irradiated nuclear fuel, is nuclear fuel that has been exposed to radiation, used, and will no longer be used. It is usually produced by nuclear reactors in nuclear power plants. Spent fuel contains a large amount of radioactive elements and is therefore radioactive. If not properly handled, it can seriously affect the environment and the health of people who come into contact with it.

[0003] Currently, the transport containers for spent fuel assemblies produced by European Pressurized Reactor (EPR) units are dry transport containers. Dry transport containers use gas as a cooling medium, and after the spent fuel assemblies are loaded into the dry transport containers, they need to undergo gas filling, dewatering and drying processes.

[0004] EPR units generate a large number of high-burnup spent fuel assemblies (high-burnup fuel assemblies are nuclear fuel assemblies whose fissile nuclides are consumed at a significantly higher rate than conventional fuel assemblies during operation in a nuclear reactor). During vacuum drying, high-burnup spent fuel assemblies experience a rapid temperature rise. Re-immersion in water can lead to deterioration of the cladding performance due to cooling, resulting in structural integrity loss and even radioactive gas leakage, rendering the high-burnup spent fuel assemblies untransportable. Wet containers were developed to address this issue. Wet containers use liquid as a medium, leveraging the cooling and radiation shielding functions of the liquid to facilitate the transfer of spent fuel assemblies.

[0005] my country's EPR units face the problem of having no mature and usable spent fuel transport containers available domestically or internationally. Summary of the Invention

[0006] This application proposes a spent fuel assembly container to address the problem that there are no mature and usable spent fuel transport containers available domestically or internationally for EPR units in my country.

[0007] To achieve the above objectives, this application provides a spent fuel assembly container, including a sealed cylinder and a shock-absorbing assembly;

[0008] The sealing cylinder includes a cavity for holding spent fuel assemblies, and the two ends of the sealing cylinder in the axial direction are an open end and a closed end, respectively, and the open end is sealed by a sealing cap assembly;

[0009] The open end includes a feed port that connects to the EPR unit. The cylinder wall of the open end is provided with an exhaust port, and the cylinder wall of the closed end is provided with a water filling port. Both the exhaust port and the water filling port are provided with valves.

[0010] Both the open end and the closed end are fitted with the shock-absorbing assembly. The shock-absorbing assembly includes a valve tool interface corresponding to the valve position, and a through hole for the trunnion of the open end and the trunnion of the closed end to extend out.

[0011] Optionally, in the above-mentioned spent fuel assembly container, the shock absorption assembly includes a first shock absorber and a second shock absorber, wherein the first shock absorber and the second shock absorber include holes that are sleeved and connected to the sealing cylinder.

[0012] Both the open end and the closed end have a first stepped surface. The first shock absorber is connected to the first stepped surface. At least a portion of the first shock absorber is an annular shape adapted to the shape of the sealing cylinder. The outer diameter of at least a portion of the annular shape is greater than or equal to the outer diameter of the sealing cylinder.

[0013] The second shock absorber includes the through hole and is connected to the sealing cylinder.

[0014] Optionally, in the aforementioned spent fuel assembly container, the second shock absorber has a polygonal cross-section along the direction perpendicular to the axis of the sealed cylinder.

[0015] Optionally, in the above-mentioned spent fuel assembly container, the second shock absorber is connected to the sealed cylinder via a connecting assembly;

[0016] The connecting component includes a positioning groove and a positioning block;

[0017] The positioning groove is formed in the wall of the sealing cylinder, and the positioning groove corresponds to and is connected to the through hole.

[0018] A portion of the positioning block is located in the positioning groove, and another portion of the positioning block is located in the through hole. The positioning block is used to fix the shock-absorbing assembly in the sealing cylinder.

[0019] The trunnion is connected to the sealing cylinder via the positioning block.

[0020] Optionally, the spent fuel assembly container also includes a third shock absorber, which is sleeved and connected to the second shock absorber. The third shock absorber includes a mounting cavity adapted to the shape of the second shock absorber, and the mounting cavity includes a clearance groove for accommodating the trunnion.

[0021] At least a portion of the outer diameter of the third shock absorber is greater than or equal to the outer diameter of the sealing cylinder;

[0022] The third shock absorber is connected to the sealed cylinder.

[0023] Optionally, in the above-mentioned spent fuel assembly container, the sealed cylinder includes an inner cylinder, a neutron shielding layer, and a heat dissipation layer;

[0024] The inner cylinder includes the cavity;

[0025] The neutron shielding layer is located outside the inner cylinder and is used to shield neutron rays emitted by the spent fuel assembly;

[0026] The heat dissipation layer is located outside the neutron shielding layer and is used to increase the heat dissipation area;

[0027] The length of the neutron shielding layer along the axial direction of the sealed cylinder is less than the length of the sealed cylinder along its own axial direction, and the end face of the neutron shielding layer located in the axial direction of the sealed cylinder forms the first stepped surface with the outer wall of the inner cylinder.

[0028] Optionally, in the above-mentioned spent fuel assembly container, a basket is provided inside the cavity;

[0029] The basket includes a criticality shield and a support frame. The support frame includes a small cavity for mounting the criticality shield. The criticality shield is used to accommodate the spent fuel assembly and absorb neutron radiation from the spent fuel assembly.

[0030] Optionally, in the above-mentioned spent fuel assembly container, the support frame includes a first insert plate and a second insert plate, wherein the first insert plate and the second insert plate are perpendicular to each other;

[0031] Both sides of the first insert plate and the second insert plate in the length direction include at least two slots. The first insert plate and the second insert plate are connected by inserting into the slots. The first insert plate and the second insert plate divide the cavity into multiple small cavities.

[0032] Optionally, in the above-mentioned spent fuel assembly container, a hoop is provided between the support frame and the sealing cylinder, the hoop being used to fill the space between the support frame and the sealing cylinder.

[0033] Optionally, in the above-mentioned spent fuel assembly container, the inner wall of the sealed cylinder includes a second stepped surface, which is located on the side of the feed port away from the open end;

[0034] The sealing cap assembly includes an inner cap and an outer cap;

[0035] The outer wall of the inner cover includes an annular protrusion in the middle. The inner cover extends into the sealing cylinder at the end of the annular protrusion away from the outer cover. The annular protrusion mates with the second stepped surface.

[0036] An annular protrusion is provided on the side of the outer cover that fits against the inner cover. The annular protrusion is sleeved on the end of the inner cover near the outer cover, and the annular protrusion abuts against the annular protrusion.

[0037] The outer cover is connected to the sealing cylinder.

[0038] Optionally, in the above-mentioned spent fuel assembly container, the inner cover includes an air filling / venting port and an air filling / draining port;

[0039] The filling and exhaust ports are used to fill the sealed cylinder with gas or to exhaust the sealed cylinder with gas.

[0040] The filling and draining ports are used to fill the sealing cylinder with water or to drain the water from the sealing cylinder.

[0041] The sealed cylinder body includes a filling and draining pipe that communicates with the filling and draining port.

[0042] Optionally, in the above-mentioned spent fuel assembly container, the open end is provided with an exhaust port, and the closed end is provided with a water filling port;

[0043] The shock absorption assembly includes a valve tool interface, the valve tool interface located at the open end is connected to the vent hole, and the valve tool interface located at the closed end is connected to the water filling hole;

[0044] The valve tool interface includes a first hole section that mates with a valve tool and a shielded hole section that communicates with an exhaust hole or a water filling hole, wherein the shielded hole section is provided with a shielding plug;

[0045] The vent and the water filling hole are equipped with screw plugs.

[0046] This application provides a spent fuel assembly container, including a sealed cylinder and a shock-absorbing assembly. The open end of the sealed cylinder has an vent hole, and the closed end has a water filling hole. Valves are installed on both the vent hole and the water filling hole. Trunnions and the shock-absorbing assembly are also provided at both the open and closed ends of the sealed cylinder. The open end of the sealed cylinder, through the trunnion, the shock-absorbing assembly, and the vent hole, forms an interface that can connect with the discharge position of an EPR unit. The closed end of the sealed cylinder, through the trunnion, the shock-absorbing assembly, and the water filling hole, forms an interface that can connect with the filling / draining structure or the filling / venting structure of the EPR unit. This enables the on-site transfer of the sealed cylinder to the EPR unit, providing a usable container for the transport of spent fuel from the EPR unit and solving a problem in the field. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort, and this application can be applied to other similar scenarios based on the provided drawings. Unless obvious from the linguistic context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0048] Figure 1 This is a schematic diagram of the structure of the spent fuel assembly container provided in the embodiments of this application;

[0049] Figure 2 This is an exploded view of the spent fuel assembly container provided in an embodiment of this application;

[0050] Figure 3 This is a cross-sectional view of the open end of the spent fuel assembly container provided in an embodiment of this application;

[0051] Figure 4 This is a schematic diagram of a spent fuel assembly container being dropped horizontally according to an embodiment of this application;

[0052] Figure 5 This is a schematic diagram of the structure of the first shock absorber provided in the embodiments of this application;

[0053] Figure 6 This is a cross-sectional view of the first shock absorber provided in the embodiments of this application;

[0054] Figure 7 yes Figure 6 A magnified view of part A in the image;

[0055] Figure 8 This is a schematic diagram of the structure of the second shock absorber provided in the embodiments of this application;

[0056] Figure 9 yes Figure 8 A magnified view of part B in the image;

[0057] Figure 10 This is a schematic diagram of the valve tool interface provided in an embodiment of this application;

[0058] Figure 11 This is a schematic diagram of the valve tool interface provided in this application embodiment, including a shielding plug and a screw;

[0059] Figure 12 This is a cross-sectional view of the second shock absorber provided in the embodiments of this application;

[0060] Figure 13This is a schematic diagram of the structure of the third shock absorber provided in the embodiments of this application;

[0061] Figure 14 This is a cross-sectional view of the third shock absorber provided in the embodiments of this application;

[0062] Figure 15 yes Figure 14 A magnified view of part C;

[0063] Figure 16 This is a schematic diagram of the structure of the sealing cylinder provided in the embodiments of this application;

[0064] Figure 17 This is a schematic diagram showing the internal structure of a partially cut sealing cylinder provided in an embodiment of this application;

[0065] Figure 18 This is a cross-sectional view of the sealing cylinder provided in the embodiment of this application;

[0066] Figure 19 This is a top view of the sealing cylinder provided in the embodiment of this application;

[0067] Figure 20 This is a schematic diagram of the structure of the suspended platform provided in the embodiment of this application;

[0068] Figure 21 This is an enlarged view of the end face of the suspended platform provided in the embodiment of this application;

[0069] Figure 22 This is a schematic diagram of the end face structure of the suspended platform provided in the embodiments of this application;

[0070] Figure 23 This is a partial view of the cooperation between the suspended platform and the hoop plate provided in an embodiment of this application;

[0071] Figure 24 This is a schematic diagram of the connection between the first insert plate and the second insert plate provided in an embodiment of this application;

[0072] Figure 25 This is a schematic diagram of the structure of the first insert plate (second insert plate) provided in the embodiments of this application;

[0073] Figure 26 This is a schematic diagram of the anti-critical sleeve provided in the embodiments of this application;

[0074] Figure 27 This is a top view of the anti-critical sleeve provided in the embodiments of this application;

[0075] Figure 28 This is a schematic diagram of the inner cover provided in an embodiment of this application;

[0076] Figure 29 This is a schematic diagram of the structure of the outer cover provided in the embodiment of this application.

[0077] in:

[0078] 1-Sealed cylinder; 11-Open end; 111-Exhaust port; 12-Closed end; 121-Water filling hole; 13-First step surface; 14-Inner cylinder; 15-Neutron shielding layer; 16-Heat dissipation layer; 17-Suspension basket; 171-Anti-critical sleeve; 172-Support frame; 1721-First insert plate; 1722-Second insert plate; 1723-Slot; 173-Hog plate; 174-Connecting plate; 18-Second step surface; 19-Feed port; 2-Shock absorption assembly; 21-First shock absorber; 211-Embedded groove; 212-Third connecting hole; 22-Second shock absorber; 221 - Through hole; 23- Valve tool interface; 231- Shielding plug; 232- Screw plug; 233- First hole section; 234- Shielding hole section; 3- Sealing cover assembly; 31- Inner cover; 311- Annular protrusion; 312- Inflation / exhaust port; 313- Inflation / drain port; 314- Inflation / drain pipe; 32- Outer cover; 321- Annular protrusion; 4- Trunnion; 5- Connecting assembly; 51- Positioning groove; 52- Positioning block; 6- Third shock absorber; 61- Relief groove; 62- Third housing; 64- Sleeve; 65- First part; 66- Second part; 67- Third part; 68- Fourth part. Detailed Implementation

[0079] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. The described embodiments are only a part of the embodiments of the present application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive effort are within the scope of protection of the present application.

[0080] It should be noted that, for ease of description, only the parts relevant to the application are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0081] It should be understood that the terms "system," "apparatus," "unit," and / or "module" used in this application are a method of distinguishing different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0082] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0083] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0084] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0085] Spent fuel assembly containers are used to facilitate the transfer of spent fuel assemblies between different nuclear facilities within the EPR reactor site, enabling both on-site and off-site transport. Spent fuel assemblies unloaded from the EPR reactor possess high radioactivity and decay heat, and after leaving the EPR reactor's robust protection system, they rely entirely on the protection of their containers. During transport, spent fuel assembly containers may encounter accident conditions such as collisions, drops, punctures, fires, and deep-water immersion; therefore, the containers are the fundamental guarantee for the safety of spent fuel assembly storage and transportation.

[0086] Please see Figure 1 and Figure 2 As shown, the spent fuel assembly container disclosed in this application includes a sealed cylinder 1 and a shock-absorbing assembly 2.

[0087] The sealed cylinder 1 includes a cavity for holding spent fuel assemblies. The two ends of the sealed cylinder 1 in the axial direction are an open end 11 and a closed end 12, respectively. The spent fuel assembly is loaded into the sealed cylinder 1 through the open end 11, and the open end 11 is sealed by the sealing cap assembly 3, so that the spent fuel assembly is encapsulated in the sealed cylinder 1.

[0088] Continue reading Figure 2 and Figure 17The open end 11 includes a feed port 19, an exhaust port 111, a trunnion, and a shock-absorbing assembly. The feed port 19 is connected to the discharge position of the EPR unit. The spent fuel assembly of the EPR unit enters the sealed cylinder 1 through the feed port 19. The exhaust port 111 is equipped with a valve. The closed end 12 includes a water filling port 121, a trunnion, and a shock-absorbing assembly. The water filling port 121 is equipped with a valve.

[0089] The feed port 19, the vent 111, the trunnion and the shock-absorbing assembly constitute the first interface of the open end 11, which can be connected to the discharge position of the EPR unit. The water filling port 121, the trunnion and the shock-absorbing assembly constitute the second interface of the closed end 12, which can be connected to the filling and draining structure or the filling and venting structure of the EPR unit. This realizes the connection between the sealed cylinder 1 and the EPR unit, providing a usable container for the transportation of spent fuel from the EPR unit and solving a problem in the field.

[0090] When the EPR unit discharges fuel into the spent fuel assembly container, the discharge position of the EPR unit aligns with the first interface, and the filling / draining structure or filling / venting structure of the EPR unit aligns with the second interface. The spent fuel assembly enters the sealed cylinder 1 through the feed port 19. The valve on the water filling port 121 and the valve on the venting port 111 open, and the spent fuel assembly container is filled with water and vented. After the filling and venting are completed, the valve on the water filling port 121 closes, and the valve on the venting port 111 closes.

[0091] Optionally, the open end 11 is provided with an exhaust port 111, and the closed end 12 is provided with two water filling ports 121; the exhaust port 111 cooperates with one of the water filling ports 121 to exhaust air and fill water, and the other water filling port 121 serves as a spare port, which can be used to discharge the cooling water of the sealing cylinder 1, adjust and measure the water level of the sealing cylinder 1, and serve as a spare port for depressurizing the sealing cylinder 1.

[0092] The vent 111 is also used to discharge cooling water from the inner cavity of the penetrating part, and as a spare hole for depressurizing the sealing cylinder 1; the water filling hole 121 is also used for depressurizing the sealing cylinder 1, and as a spare hole for discharging cooling water from the penetrating part or the inner cavity of the sealing cylinder 1.

[0093] The open end 11 and closed end 12 of the sealed cylinder 1 are provided with trunnions 4, which are used for lifting operations of the spent fuel assembly container. Optionally, the trunnion 4 located at the open end 11 is used for lifting, and the trunnion 4 located at the open end 11 cooperates with the trunnion 4 located at the closed end 12 to realize the conversion between the horizontal and vertical attitudes of the spent fuel assembly container.

[0094] The shock-absorbing assembly 2 fitted on the open end 11 and the closed end 12 is used to adapt the open end 11 and the closed end 12 of the sealed cylinder 1 to the interface of the EPR unit.

[0095] The shock absorber 2 is provided with a valve tool interface 23 corresponding to the valve position, which facilitates the opening and closing of the valve at the open end 11 and the valve at the closed end 12, and facilitates filling and draining operations. The shock absorber 2 also includes a through hole 221 for the trunnion 4 to extend, which facilitates the lifting operation of the spent fuel assembly container. At the same time, the shock absorber 2 also protects the trunnion 4. The shock absorber 2 includes a hole that is fitted and connected to the open end 11 and the closed end 12. The length of the shock absorber 2 along the axial direction of the sealing cylinder 1 is less than or equal to the length of the open end 11 or the closed end 12 along the axial direction of the sealing cylinder 1. The sealing cover assembly 3 is taken out or put in through the open end 11.

[0096] In this application, the shock absorber 2 does not affect the loading or unloading of the spent fuel assembly container. That is to say, when the spent fuel assembly container is being loaded or unloaded, it is not necessary to disassemble the shock absorber 2. Compared with the related technology, which requires the shock absorber to be disassembled before loading or unloading, this can improve the transportation efficiency of the spent fuel assembly container for spent fuel assemblies.

[0097] At least a portion of the outer diameter of the damping component 2 is greater than or equal to the outer diameter of the sealing cylinder 1, so that the damping component 2 can perform damping function in the circumferential direction of the sealing cylinder 1.

[0098] The spent fuel assembly container disclosed in this scheme also includes a third shock absorber 6, which is sleeved and connected to the shock absorber assembly 2. The third shock absorber 6 includes a mounting cavity adapted to the shape of the second shock absorber assembly 22, and the mounting cavity includes a clearance groove 61 for accommodating the trunnion 4. At least a portion of the outer diameter of the third shock absorber 6 is greater than or equal to the outer diameter of the sealing cylinder 1, and the outer diameter of the sealing cylinder 1 is the diameter of the outermost layer of the heat dissipation layer 16. The third shock absorber 6 protects the ends and circumference of the spent fuel assembly container.

[0099] When the spent fuel assembly container includes shock absorber 2, the spent fuel assembly container is mainly used for on-site transportation of spent fuel assemblies; when the spent fuel assembly container includes shock absorber 2 and third shock absorber 6, the spent fuel assembly container can be used for off-site transportation of spent fuel assemblies.

[0100] During off-site transportation, trunnion 4 can be removed to increase the compression stroke of the third shock absorber 6 along the axis perpendicular to the sealed cylinder 1, thereby providing better shock absorption for the spent fuel assembly container. Figure 4 As shown.

[0101] Continue reading Figure 2 The shock absorption assembly 2 of the spent fuel assembly container includes a first shock absorber 21 and a second shock absorber 22. The first shock absorber 21 and the second shock absorber 22 are two independent shock absorbers, which are installed separately and replaced only when necessary.

[0102] The first shock absorber 21 and the second shock absorber 22 are two independent shock absorbers, which can reduce the mutual constraints between the first shock absorber 21 and the second shock absorber 22 in the design and improve the flexibility of the first shock absorber 21 and the second shock absorber 22 in the setting.

[0103] The first shock absorber 21 and the second shock absorber 22 of the shock-absorbing assembly 2 located at the open end 11 are sequentially sleeved on the open end, and the first shock absorber 21 and the second shock absorber 22 of the shock-absorbing assembly 2 located at the closed end 12 are sequentially sleeved on the closed end. The first shock absorber 21 is closer to the heat dissipation layer 16 than the second shock absorber 22. The first shock absorber 21 and the second shock absorber 22 include holes that are sleeved and connected to the sealing cylinder 1.

[0104] Optionally, both the open end 11 and the closed end 12 have a first stepped surface 13, the first shock absorber 21 abuts against the first stepped surface 13 and is connected to the first stepped surface 13, at least a portion of the first shock absorber 21 is an annular shape adapted to the shape of the sealing cylinder 1, and the outer diameter of at least a portion of the annular shape is greater than or equal to the outer diameter of the sealing cylinder 1, so as to play a shock absorption role in the circumference of the sealing cylinder 1;

[0105] The second shock absorber 22 includes a through hole 221 and is connected to the sealing cylinder 1.

[0106] The first shock absorber 21 and the second shock absorber 22 are respectively connected to the first stepped surface 13 and the sealing cylinder 1. The first shock absorber 21 and the second shock absorber 22 may or may not abut against each other. The second shock absorber 22 may be flush with the end face of the sealing cylinder 1 or may not extend beyond the end face of the sealing cylinder 1.

[0107] Optionally, the through hole 221 is a through hole 221 for the trunnion 4 to extend out, which restricts the circumferential and axial dimensions of the second shock absorber 22 along the sealing cylinder 1. Optionally, the circumferential dimension of the second shock absorber 22 is less than or equal to the circumferential dimension of the first shock absorber 21, and the axial dimension of the second shock absorber 22 can be greater than or equal to the axial dimension of the first shock absorber 21.

[0108] Please see Figure 3 The first shock absorber 21 abuts against the first stepped surface 13, and the second shock absorber 22 abuts against the first shock absorber 21.

[0109] The sealed cylinder 1 and the shock-absorbing assembly 2 are assembled into a whole and then placed inside a fixture for transporting spent fuel assembly containers. The fixture is a cylindrical structure that is adapted to the shape of the sealed cylinder 1. The shock-absorbing assembly 2 mainly provides circumferential protection to the spent fuel assembly containers during transport within the fixture.

[0110] Optionally, the second shock absorber 22 extends beyond the end face of the sealed cylinder 1. In extreme situations such as earthquakes, if the spent fuel assembly container falls off the tooling, the second shock absorber 22 can provide axial damping for the sealed cylinder 1.

[0111] The shock-absorbing component 2 is connected to the sealing cylinder 1. Optionally, the entire shock-absorbing component 2 can be connected to the first step surface 13 of the open end 11, or the entire shock-absorbing component 2 can be connected to the cylinder wall of the open end 11 of the sealing cylinder 1.

[0112] The damping assembly 2 can also be a first damper 21 and a second damper 22 connected to the sealing cylinder 1 respectively. Optionally, the first stepped surface 13 is provided with a flange, and the first damper 21 is bolted to the first stepped surface 13 through the flange; the second damper 22 can be connected to the first damper 21, and the second damper 22 can also be fixed to the sealing cylinder 1 through the trunnion 4.

[0113] During the transportation of the spent fuel assembly container, the shock absorber 2 and the sealing cylinder 1 are integrated as a whole, and there is no relative movement between the shock absorber 2 and the sealing cylinder 1, nor is there any relative movement between the first shock absorber 21 and the second shock absorber 22.

[0114] Please see Figure 2 and Figure 3 , Figure 2 and Figure 3 In one embodiment where the second shock absorber 22 is connected to the sealing cylinder 1 via the connecting assembly 5, the connecting assembly 5 includes a positioning groove 51 and a positioning block 52. The positioning groove 51 is formed on the cylinder wall of the sealing cylinder 1, and the positioning groove 51 corresponds to and communicates with the through hole 221 of the second shock absorber 22. A part of the positioning block 52 is located in the positioning groove 51, and another part of the positioning block 52 is located in the positioning hole. Optionally, the positioning groove 51 and the positioning hole are interference-fitted with the positioning block 52 to fix the second shock absorber 22 in the sealing cylinder 1.

[0115] The number of positioning grooves 51 is equal to the number of trunnions 4, such as Figure 2 As shown, the open end 11 of the sealing cylinder 1 includes four trunnions 4, and the closed end 12 of the sealing cylinder 1 includes two trunnions 4. Correspondingly, the number of positioning grooves 51 at the open end 11 of the sealing cylinder 1 is four, and the number of positioning grooves 51 at the closed end 12 of the sealing cylinder 1 is two. Optionally, regardless of whether it is the open end 11 or the closed end 12 of the sealing cylinder 1, the positioning grooves 51 are evenly distributed in the circumferential direction of the sealing cylinder 1.

[0116] By cooperating with the positioning block 52, positioning groove 51, and positioning hole, the second shock absorber 22 is simultaneously positioned in the circumferential and axial directions of the sealing cylinder 1.

[0117] Continue reading Figure 2A guide rod is provided on the side of the trunnion 4 facing the positioning block 52, and the axis of the guide rod is parallel to the axis of the trunnion 4; a guide hole corresponding to the position of the guide rod is provided on the positioning block 52; a first connecting hole is provided between adjacent guide rods on the trunnion 4, and a second connecting hole corresponding to and connected to the first connecting hole is provided between the guide holes on the positioning block 52.

[0118] During installation, first install the positioning block 52 in the positioning groove 51 and the positioning hole, then insert the guide rod of the trunnion 4 into the guide hole of the positioning block 52 to achieve the initial connection between the trunnion 4 and the positioning block 52. Finally, the bolts pass through the first connecting hole and the second connecting hole in sequence to lock the trunnion 4 and the positioning block 52 onto the sealing cylinder 1.

[0119] The shapes of the first shock absorber 21 and the second shock absorber 22 can be designed according to actual needs.

[0120] Please see Figures 5-7 , Figure 5 This is a schematic diagram of one embodiment of the first shock absorber 21. Figure 6 This is a side view of the first shock absorber 21; Figure 7 for Figure 6 A magnified view of part A in the image.

[0121] Figure 5 The first shock absorber 21 is annular, and the outer diameter of the first shock absorber 21 is at least equal to the outer diameter of the heat dissipation layer 16. Both the first shock absorber 21 and the heat dissipation layer 16 can provide shock absorption when the spent fuel assembly container experiences a horizontal drop. The first shock absorber 21 primarily absorbs the impact load during a horizontal drop of the spent fuel assembly container. Figure 4 This is a schematic diagram of a spent fuel assembly container being dropped horizontally.

[0122] The first shock absorber 21 has an embedding groove 211 on the side facing the sealing cylinder 1. The flange of the sealing cylinder 1 is embedded in the embedding groove 211 of the first shock absorber 21. The side of the first shock absorber 21 facing the sealing cylinder 1 can abut against the end face of the heat dissipation layer 16.

[0123] The first shock absorber 21 has a third connecting hole 212 at the position of the flange hole corresponding to the flange. The first shock absorber 21 is connected to the flange by bolts that cooperate with the third connecting hole and the flange hole.

[0124] Optionally, the side of the first shock absorber 21 away from the flange is a plane, and the second shock absorber 22 abuts against the side of the first shock absorber 21 away from the flange.

[0125] Optionally, the first shock absorber 21 includes a first housing and damping material filled within the first housing. In this embodiment, the first housing comprises two parts: a first part corresponding to the flange and a second part located outside the first part. The first part is a solid flange structure to ensure the connection strength between the first shock absorber 21 and the flange, and the second part includes a first filling cavity for filling the damping material.

[0126] Optionally, the first housing is a metal housing, and the shock-absorbing material includes at least one of wood and honeycomb aluminum.

[0127] Taking wood as an example of shock-absorbing material, the wood grain direction of the first filling cavity is parallel to the axial direction of the inner cylinder 14, that is, the wood grain direction is consistent with the horizontal impact direction, which can maximize the impact resistance and structural stability.

[0128] Please see Figures 16-19 This is a schematic diagram of the structure of the sealing cylinder 1 disclosed in one embodiment of this application. Specifically, Figure 16 The schematic diagram of the sealed cylinder 1 is shown below. Figure 17 A partial cut of the sealed cylinder 1 is shown to illustrate its internal structure. Figure 18 This is a cross-sectional view of the sealing cylinder 1; Figure 19 This is a top view of the sealed cylinder 1.

[0129] The sealed cylinder 1 includes an inner cylinder 14, a neutron shielding layer 15, and a heat dissipation layer 16, which are arranged in a stacked manner from the inside to the outside.

[0130] The inner cylinder 14 includes a cavity, which is a sealed cylinder 1 for housing spent fuel assemblies; a neutron shielding layer 15 is located between the inner cylinder 14 and the heat dissipation layer 16, and the neutron shielding layer 15 is used to shield neutron rays emitted by the spent fuel assembly; the heat dissipation layer 16 is located on the outermost layer, increasing the heat dissipation area of ​​the sealed cylinder 1 and dissipating the heat dissipated by the spent fuel assembly through the inner cylinder 14 and the neutron shielding layer 15.

[0131] The neutron shielding layer 15 surrounds the inner cylinder 14 in a ring-shaped structure. (See also...) Figure 19 Optionally, the neutron shielding layer 15 is composed of multiple sector blocks. The sector blocks have a sector-shaped cross-section along the direction perpendicular to the axis of the sealing cylinder 1. The length direction of the sector blocks is parallel to the axis of the sealing cylinder 1. Multiple sector blocks are closely arranged along the circumference of the sealing cylinder 1 to form a ring structure.

[0132] The neutron shielding layer 15, composed of sector-shaped blocks, has small gaps between adjacent sector blocks, resulting in less neutron radiation leakage through these gaps and thus better shielding against neutron radiation. The neutron shielding layer 15 can be provided as a single layer or at least two layers along the radial direction of the sealed cylinder 1.

[0133] The units that make up the neutron shielding layer 15 are not limited to sector blocks, but can also be other shapes, without specific limitations here.

[0134] In some embodiments, the sector block includes a sector shell and neutron shielding material injected within the sector shell. Optionally, the sector shell may be a stainless steel shell or a shell made of other materials suitable for nuclear power plants, both of which are within the scope of this application.

[0135] Neutron shielding materials include, but are not limited to, boron-containing polyethylene.

[0136] Optionally, the sector-shaped shell is connected to the inner cylinder 14.

[0137] Alternatively, the neutron shielding layer 15 may also be made of an annular cavity formed in the inner cylinder 14 and a neutron shielding material injected into the annular cavity.

[0138] The neutron shielding layer 15 is not limited to the two embodiments described above, and may also be other structures, which are not specifically limited here.

[0139] The neutron shielding layer 15 is used to shield neutron rays emitted circumferentially from the inner cylinder 14. Neutron rays emitted from the closed end 12 of the inner cylinder 14 are shielded by a neutron shielding structure located at the closed end 12 of the inner cylinder 14. Optionally, the closed end 12 of the inner cylinder 14 includes a shielding cavity for injecting neutron shielding material. The projection of the shielding cavity along the axial direction of the sealed cylinder 1 is at least equal to the projection of the inner cavity of the inner cylinder 14 along the axial direction of the sealed cylinder 1, and the projection of the shielding cavity completely covers the projection of the inner cavity of the inner cylinder 14.

[0140] Please continue reading. Figure 17 and Figure 18 The length of the neutron shielding layer 15 along the axis of the sealing cylinder 1 is less than the length of the sealing cylinder 1 along its own axis. That is, the open end 11 and the closed end 12 of the sealing cylinder 1 do not have the neutron shielding layer 15, or in other words, the neutron shielding layer 15 is not provided at the location where the shock-absorbing component 2 is provided on the sealing cylinder 1.

[0141] Continue reading Figure 17 Flanges are provided on the end face of the neutron shielding layer 15 near the open end 11 and the end face near the closed end 12. The surface of the flange away from the neutron shielding layer 15 is a first stepped surface 13 that abuts against the shock-absorbing component 2. Optionally, the flange is fixedly connected to the inner cylinder 14, and the fixed connection method can be welding.

[0142] The heat dissipation layer 16 is used to increase the heat dissipation area of ​​the sealed cylinder 1, improve the thermal performance of the sealed cylinder 1, and keep the temperature inside the spent fuel assembly container within a safe range. Optionally, the heat dissipation layer 16 includes a plurality of heat dissipation fins stacked along the axial direction of the inner cylinder 14, and the heat dissipation fins are connected to the fan-shaped shell of the neutron shielding layer 15.

[0143] The fan-shaped plates surrounding the multiple fan-shaped blocks of the neutron shielding layer 15 can also reduce the impact load when the sealed cylinder 1 is dropped horizontally.

[0144] Optionally, the heat dissipation layer 16 includes a plurality of heat dissipation fins arranged radially along the circumference of the inner cylinder 14, wherein the length extension direction of a single heat dissipation fin is parallel to the axial direction of the inner cylinder 14.

[0145] Please continue reading. Figure 16 , Figure 17 and Figure 18 The outer ring of the heat dissipation layer 16 is the outermost structure of the sealing cylinder 1, and the height of the heat dissipation layer 16 does not exceed the plane where the flange is located.

[0146] The structure of the sealed cylinder 1 is not limited to the above embodiment, and may also be other structures suitable for the transfer of spent fuel assemblies, all of which are within the scope of protection of this application.

[0147] Optionally, the second shock absorber 22 is provided with a valve tool interface 23 that communicates with the valve, and a valve tool is provided in the valve tool interface 23.

[0148] The valve tool interface 23 includes a first hole section 233 that mates with a valve tool and a shielding hole section 234 that communicates with an exhaust hole 111 or a water filling hole 121. The first hole section 233 and the shielding hole section 234 are provided with a shielding plug 231. The exhaust hole 111 and the water filling hole 121 are provided with screw plugs 232.

[0149] A settling groove is provided at the end of the first hole section 233 away from the shielding hole section 234. The connection position between the settling groove and the first hole section 233 forms a stepped surface. Valves and tools are provided in the settling groove and the part of the first hole section 233 near the settling groove.

[0150] See Figure 9 ,for Figure 8 The enlarged view of section B shows that the valve tool is located at the position of the sinker via a flange structure, and the valve tool is bolted to the bottom of the sinker through the flange structure.

[0151] See Figure 10 and Figure 11Optionally, a bushing is provided inside the valve tool interface 23. The shape of the bushing is adapted to the shape of the valve tool interface 23. That is, the bushing is located in the sink, the first hole section 233 and the shielding hole section 234. A shielding plug 231 is provided on the bushing at the position corresponding to the through hole 221 of the valve tool interface 23.

[0152] A screw plug 232 is installed inside the vent 111 and the water filling hole 121. The shielding plug 231 cooperates with the screw plug 232 to reduce the amount of radiation leaked from the valve tool interface 23. Optionally, the outer shell of the shielding plug 231 is a metal shell, and the shell is filled with neutron shielding material.

[0153] Please see Figure 8 and Figure 11 , Figure 8 This is a schematic diagram of one embodiment of the second shock absorber 22. Figure 12 This is a side view of the second shock absorber 22.

[0154] Figure 8 The second shock absorber 22 has an octagonal cross-section along the axis perpendicular to the sealed cylinder 1. One of the two adjacent sides of the octagonal second shock absorber 22 has a larger area than the other. A positioning groove 51 is provided on the side with the larger area, and a valve tool is provided on the side with the smaller area. It should be noted that the valve tool is a tool used in nuclear power plants for filling or draining water or venting air into the sealed container.

[0155] This shape design can meet the setting requirements of trunnion 4 and valve tool interface 23, while increasing the volume of the second shock absorber 22 and improving the compression resistance of the second shock absorber 22.

[0156] Optionally, the second shock absorber 22 includes a second housing and a damping material, the second housing including a second filling cavity for filling the damping material, the damping material being filled inside the second housing.

[0157] The damping materials include at least one of wood and honeycomb aluminum.

[0158] Taking wood as an example of shock-absorbing material, the wood grain direction of the second filling cavity is perpendicular to the axial direction of the inner cylinder 14, that is, the wood grain direction is consistent with the vertical impact direction, which can maximize the impact resistance and structural stability.

[0159] The second shock absorber 22 is not limited to an octahedron shape; it can also be cylindrical, other polygonal, or other irregular shapes, all of which are within the scope of protection of this application.

[0160] Continue reading Figure 3The third shock absorber 6 is sleeved outside the shock absorber assembly 2. Optionally, the third shock absorber 6 includes a groove that matches the shape of the second shock absorber 22, and the groove communicates with the relief groove 61. The second shock absorber 22 and the trunnion 4 provide a certain degree of restraint for the third shock absorber 6.

[0161] After the third shock absorber 6 is installed, the shock absorber assembly 2 is enclosed by the third shock absorber 6. The third shock absorber 6 works with the first shock absorber 21 to buffer horizontal impact loads. The side of the third shock absorber 6 away from the second shock absorber 22 is the closed end 12. The third shock absorber 6 can also buffer vertical impact loads.

[0162] Optionally, the third shock absorber 6 is connected to the sealing cylinder 1.

[0163] Please see Figure 13 , Figure 14 and Figure 15 An embodiment of the third shock absorber 6 is disclosed. The closed end 12 of the third shock absorber 6 has an annular groove, and the bottom of the annular groove has a fourth connecting hole that penetrates the third shock absorber 6. The sealing cover assembly 3 includes a fifth connecting hole that corresponds to and communicates with the fourth connecting hole. The third shock absorber 6 is locked to the sealing cover assembly 3 by bolts that cooperate with the fourth connecting hole and the fifth connecting hole, thereby fixing the third shock absorber 6 on the sealing cylinder 1.

[0164] The connection between the third shock absorber 6 and the sealing cylinder 1 is not limited to the above embodiment, but can also be made in other ways, all of which are within the protection scope of this application.

[0165] Continue reading Figure 14 The diagram below shows the structural composition of the third shock absorber 6. In this embodiment, the third shock absorber 6 includes a third housing 62, damping material, and a sleeve. The third housing and sleeve can be made of ferrous metal materials such as stainless steel or carbon steel. The third housing includes a third filling cavity for filling the damping material, and the damping material is arranged in sections within the third filling cavity.

[0166] Figure 14 The third filling cavity is divided into four parts. The first part 65 is the part of the third shock absorber 6 that corresponds to the groove that matches the shape of the second shock absorber 22. The second part 66 is the part of the end face of the third shock absorber 6 that is away from the second shock absorber 22. The third part 67 is annular. The third part 67 is close to the second part 66 and extends radially from the edge of the third shock absorber 6 towards the center. The extension position of the third part 67 in the radial direction of the sealing cylinder 1 does not exceed the groove wall. The fourth part 68 is the remaining part.

[0167] The damping materials include at least one of wood and honeycomb aluminum.

[0168] Taking wood as an example of shock-absorbing material, the wood grain direction of the first part 65 and the fourth part 68 is perpendicular to the axial direction of the inner cylinder 14, that is, the wood grain direction is consistent with the vertical impact direction, which can maximize the impact resistance and structural stability. The thickness of the fourth part is the largest along the axial direction of the third shock absorber 6.

[0169] The wood grain direction of the second part 66 is parallel to the axial direction of the inner cylinder 14, and the thickness of the second part is the smallest along the axial direction of the third shock absorber 6.

[0170] The wood grain direction of the third part 67 is at an angle to the axial direction of the inner cylinder 14, and the wood grain direction is consistent with the angular impact direction, which is used to withstand tilting and overturning. The thickness of the third part along the axial direction of the third shock absorber 6 is equivalent to the thickness of the first part.

[0171] The damping materials in different zones are bonded together.

[0172] The third shock absorber 6 is configured with damping materials in zones according to the probability of the falling direction, so as to better absorb impact loads.

[0173] The damping materials for different zones of the third shock absorber 6 can also be different.

[0174] The fourth connecting hole penetrates the fourth part, and a sleeve is installed inside the fourth connecting hole to facilitate the passage of the connector, such as... Figure 15 As shown.

[0175] The first shock absorber 21, the second shock absorber 22, and the third shock absorber 6 achieve different compression resistance effects by using different wood grain directions. The cross-sectional lines of the cross-sectional views of the first shock absorber 21, the second shock absorber 22, and the third shock absorber 6 represent the grain direction of the wood.

[0176] Continue reading Figure 20 and Figure 21 , Figure 20 This is a structural schematic diagram of the suspended basket 17 inside the sealed cylinder 1. Figure 21 This is an enlarged view of the end face of the basket 17 inside the sealed cylinder 1. The basket 17 includes an anti-critical sleeve 171 and a support frame 172. The support frame 172 includes a small cavity for installing the anti-critical sleeve 171. The anti-critical sleeve 171 is used to accommodate spent fuel assemblies and absorb neutron radiation from the spent fuel assemblies.

[0177] like Figure 20 As shown, the support frame 172 includes a first insert plate 1721 and a second insert plate 1722;

[0178] Along the length direction of the first insert plate 1721 and the second insert plate 1722, slots are provided on both sides of the length direction of the first insert plate 1721 and the second insert plate 1722, and the first insert plate and the second insert plate are connected by inserting into the slots 1723.

[0179] Specifically, the plane containing the first insert plate and the plane containing the second insert plate are parallel to the axis of the sealing cylinder 1. Multiple first insert plates are arranged along the first direction, and multiple second insert plates are arranged along the second direction. The first direction and the second direction are perpendicular to each other, and the first direction and the second direction are perpendicular to the axis of the sealing cylinder 1.

[0180] Continue reading Figure 24 This is a schematic diagram of the assembled suspended platform 17. The slots of the first insert plate and the second insert plate correspond in position. The slot of the first insert plate is inserted into the slot of the second insert plate until the bottom of the slot. The first insert plate is engaged with the portion below the slot of the second insert plate, and simultaneously, the slot of the second insert plate is inserted into the slot of the first insert plate until the bottom of the slot. The second insert plate is engaged with the portion below the slot of the first insert plate. The first and second insert plates are positioned by the insertion of their slots.

[0181] The first and second insert plates have protrusions at their ends, specifically at the portion between the slots. The protrusions on the first insert plate can be inserted into the slots of the second insert plate, or vice versa. The edges of the first and second insert plates are fixed and limited by welding.

[0182] The first and second insert plates are repeatedly spliced ​​in a cross pattern along the axial direction of the sealing cylinder 1. They can be spliced ​​along the axial direction of the sealing cylinder 1 for any length, allowing for flexible arrangement.

[0183] like Figure 21 As shown, the lengths of the first and second insert plates are designed according to the size variation of the sealing cylinder 1, dividing the end face of the sealing cylinder 1 into 12 independent square spaces. The 12 independent square spaces are used to accommodate the critical sleeve 171.

[0184] In some embodiments, such as Figure 25 As shown, the first insert plate 1721 and the second insert plate 1722 are provided with two parallel slots, and each independent space has its own independent insert plate (the insert plate is a general term for the first insert plate and the second insert plate), that is, adjacent independent spaces do not share insert plates.

[0185] Compared with the disc-type hanging basket 17, the hanging basket 17 used in this solution has an increased heat transfer area and better heat transfer performance.

[0186] The spent fuel assembly container disclosed in this scheme can also be a disc-type basket 17.

[0187] The suspended platform 17 is not limited to the two embodiments described above, and may also take other forms, which are not specifically limited here.

[0188] To further optimize the above technical solution, the sealing cylinder 1 also includes a hoop plate 173. The hoop plate 173 is located between the support frame 172 and the sealing cylinder 1, and is used to fill the space between the support frame 172 and the sealing cylinder 1. The integral structure composed of the hoop plate 173 and the support frame has the same cross-sectional shape as the sealing cylinder 1 along the axial direction, which can improve the strength of the disc-type suspended basket 17 to a certain extent.

[0189] The hoop plate 173 is provided with heat dissipation holes. The shape of the heat dissipation holes can be circular, rectangular, or other shapes, and no specific limitation is made here.

[0190] Continue reading Figure 22 and Figure 23 The suspended basket 17 has a cross section perpendicular to the axis of the sealing cylinder 1, which is shaped like a grid. The four protruding positions of the grid and the hoop 173 between the sealing cylinder 1 are in the shape of an arc, and the corner positions of the grid and the hoop 173 between the sealing cylinder 1 are in the shape of a fan.

[0191] The hoop plate 173 is connected to the support frame 172 via the connecting plate 174. Optionally, the connection method is bolt connection.

[0192] Please see Figure 26 and Figure 27 , Figure 26 This is a structural diagram of one embodiment of the critical sleeve 171. Figure 27 This is a top view of the critical protection sleeve 171. Optionally, the critical protection sleeve 171 is a square tube formed by welding together four neutron absorbing plates.

[0193] Please see Figure 2 , Figure 28 and Figure 29 The sealing cap assembly 3 includes an inner cap 31 and an outer cap 32. The outer cap 32 is located away from the open end 11 of the sealing cylinder 1 relative to the inner cap 31. Optionally, the outer cap 32 is flush with the end face of the open end 11 of the sealing cylinder 1.

[0194] The inner wall of the sealing cylinder 1 includes a second stepped surface 18, which is located on the side of the feed port 19 away from the open end 11. The feed port 19 is also a stepped surface and communicates with the second stepped surface 18. The middle part of the outer wall of the inner cover 31 includes an annular protrusion 311. The end of the inner cover 31 located away from the outer cover 32 extends into the sealing cylinder 1, and the annular protrusion 311 abuts against the second stepped surface 18.

[0195] An annular protrusion 321 is provided on the side where the outer cover 32 fits against the inner cover 31. The annular protrusion 321 extends along the axial direction of the outer cover 32. The annular protrusion 321 is sleeved on the inner cover 31 at the end of the annular protrusion 311 that is close to the outer cover 32. The annular protrusion 321 abuts against the annular protrusion 311.

[0196] The sealing cover assembly 3 of this solution adopts the form of an outer cover 32 and an inner cover 31, which improves the sealing effect on the open end 11 of the sealing cylinder 1.

[0197] The outer cover 32 is provided with a sixth connecting hole, and the open end 11 of the sealing cylinder 1 is provided with a seventh connecting hole that corresponds to and communicates with the sixth connecting hole. The outer cover 32 and the sealing cylinder 1 are locked together by bolts that cooperate with the sixth connecting hole and the seventh connecting hole.

[0198] Optionally, the third shock absorber 6 includes a clearance groove that mates with the outer cover 32.

[0199] Continue reading Figure 28 The inner cover 31 includes an air inlet / outlet 312 and an air inlet / outlet 313. The air inlet / outlet 312 is used to fill the sealing cylinder 1 with gas or to discharge the gas from the sealing cylinder 1. The air inlet / outlet 313 is used to fill the sealing cylinder 1 with water or to discharge the water from the sealing cylinder 1. The sealing cylinder 1 includes an air inlet / outlet pipe 314 that communicates with the air inlet / outlet 313. The air inlet / outlet pipe 314 is connected to the inner cylinder 14.

[0200] The inner cover 31 is provided with sealing flanges corresponding to the air filling and venting port 312 and the water filling and draining port 313, forming an enclosing boundary.

[0201] The inner cover 31 is provided with a flange, and the flange has a groove in its circumference that mates with the lifting device.

[0202] A sealing ring is provided on the contact surface between the inner cover 31 and the inner cylinder 14. The inner cover 31 is pressed together by the connection between the outer cover 32 and the inner cylinder 14, thereby achieving a seal.

[0203] The spent fuel assembly container disclosed in this plan is a wet-process container.

[0204] The unique structure of the spent fuel assembly container can be adapted to the interface of the spent fuel transfer facility of the EPR unit, as well as the unloading interface of the spent fuel storage pool of the existing spent fuel reprocessing plant.

[0205] The spent fuel assembly container is suitable for both on-site and off-site transportation. During on-site transportation, a shock-absorbing component 2 is installed on the sealed cylinder 1 of the spent fuel assembly container. During off-site transportation, a shock-absorbing component 2 and a third shock absorber 6 are installed on the sealed cylinder 1 of the spent fuel assembly container.

[0206] The sealed container includes an exhaust port and a water inlet provided in the inner cylinder 14, an exhaust port 312 and a water inlet 313 provided in the outer cover 32, and a water inlet / outlet pipe 314 provided in the inner cylinder 14.

[0207] The filling and venting port 312, the filling and draining port 313, and the filling and draining pipe 314 are used for filling and venting and filling and draining operations during the unloading of spent fuel assembly reprocessing plant.

[0208] The vent 111 and water filling 121 of the inner cylinder 14 are used to transfer spent fuel assemblies to the spent fuel assembly container within the EPR unit site, thereby achieving compatibility with the EPR unit interface.

[0209] When the spent fuel assembly container receives the spent fuel assembly, it first injects liquid into the sealed container. As the amount of liquid in the sealed container increases, the amount of gas in the sealed container decreases until the sealed container is filled with liquid.

[0210] After unloading, gas is injected into the sealed container. As the amount of gas in the sealed container increases, the amount of liquid in the sealed container decreases until the sealed container is completely filled with gas.

[0211] Optionally, the liquid is water.

[0212] The cooling medium of the sealed cylinder 1 in this solution is liquid, which reduces the drainage and drying process and thus avoids the restriction of secondary water entry for high-fuel-consumption components.

[0213] The cooling medium of the sealed cylinder 1 is liquid, which, together with the heat dissipation layer 16, enhances the cooling effect of the spent fuel assembly container. Under the premise of the same initial enrichment and burnup of spent fuel assemblies, the spent fuel assembly container disclosed in this scheme can transport spent fuel assemblies with shorter cooling times compared to dry containers.

[0214] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed, and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. The scope of this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described application concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A spent fuel assembly container, characterized in that, It includes a sealed cylinder (1) and a shock-absorbing assembly (2); The sealing cylinder (1) includes a cavity for holding spent fuel assemblies. The two ends of the sealing cylinder (1) in the axial direction are an open end (11) and a closed end (12), respectively. The open end (11) is sealed by a sealing cap assembly (3). The open end (11) includes a feed port (19) that is connected to the EPR unit. The cylinder wall of the open end (11) is provided with an exhaust hole (111). The cylinder wall of the closed end (12) is provided with a water filling hole (121). Valves are provided on both the exhaust hole (111) and the water filling hole (121). The shock-absorbing assembly (2) is fitted onto both the open end (11) and the closed end (12). The shock-absorbing assembly (2) includes a valve tool interface (23) corresponding to the valve position, and a through hole (221) for the trunnion (4) of the open end (11) and the trunnion (4) of the closed end (12) to extend out.

2. The spent fuel assembly container according to claim 1, characterized in that, The shock absorption assembly (2) includes a first shock absorber (21) and a second shock absorber (22), wherein the first shock absorber (21) and the second shock absorber (22) include holes that are sleeved and connected to the sealing cylinder (1); Both the open end (11) and the closed end (12) have a first stepped surface (13), the first shock absorber (21) is connected to the first stepped surface (13), and at least a portion of the first shock absorber (21) is an annular shape adapted to the shape of the sealing cylinder (1), and at least a portion of the outer diameter of the annular shape is greater than or equal to the outer diameter of the sealing cylinder (1). The second shock absorber (22) includes the through hole (221) and is connected to the sealing cylinder (1).

3. The spent fuel assembly container according to claim 2, characterized in that, The second shock absorber (22) has a polygonal cross-section along the direction perpendicular to the axis of the sealed cylinder (1).

4. The spent fuel assembly container according to claim 2, characterized in that, The second shock absorber (22) is connected to the sealed cylinder (1) via a connecting assembly (5); The connecting component (5) includes a positioning groove (51) and a positioning block (52); The positioning groove (51) is formed on the wall of the sealing cylinder (1), and the positioning groove (51) corresponds to and is connected to the through hole (221); A portion of the positioning block (52) is located in the positioning groove (51), and another portion of the positioning block (52) is located in the through hole (221). The positioning block (52) is used to fix the shock-absorbing assembly (2) in the sealing cylinder (1). The trunnion (4) is connected to the sealing cylinder (1) via the positioning block (52).

5. The spent fuel assembly container according to claim 2, characterized in that, It also includes a third shock absorber (6), which is sleeved and connected to the second shock absorber (22). The third shock absorber (6) includes a mounting cavity that is adapted to the shape of the second shock absorber (22), and the mounting cavity includes a relief groove (61) for accommodating the trunnion (4). At least a portion of the outer diameter of the third shock absorber (6) is greater than or equal to the outer diameter of the sealing cylinder (1); The third shock absorber (6) is connected to the sealing cylinder (1).

6. The spent fuel assembly container according to any one of claims 2-5, characterized in that, The sealed cylinder (1) includes an inner cylinder (14), a neutron shielding layer (15), and a heat dissipation layer (16). The inner cylinder (14) includes the cavity; The neutron shielding layer (15) is located outside the inner cylinder (14) and is used to shield neutron rays emitted by the spent fuel assembly; The heat dissipation layer (16) is located outside the neutron shielding layer (15) and is used to increase the heat dissipation area; The length of the neutron shielding layer (15) along the axial direction of the sealing cylinder (1) is less than the length of the sealing cylinder (1) along its own axial direction. The end face of the neutron shielding layer (15) located in the axial direction of the sealing cylinder (1) forms the first step surface (13) with the outer wall of the inner cylinder (14).

7. The spent fuel assembly container according to claim 6, characterized in that, A basket (17) is provided inside the cavity. The basket (17) includes an anti-critical sleeve (171) and a support frame (172). The support frame (172) includes a small cavity for mounting the anti-critical sleeve (171). The anti-critical sleeve (171) is used to accommodate the spent fuel assembly and absorb neutron radiation from the spent fuel assembly.

8. The spent fuel assembly container according to claim 7, characterized in that, The support frame (172) includes a first insert plate (1721) and a second insert plate (1722), the first insert plate (1721) and the second insert plate (1722) being perpendicular to each other; Both sides of the first insert plate (1721) and the second insert plate (1722) in the length direction include at least two slots. The first insert plate and the second insert plate are connected by inserting into the slots. The first insert plate and the second insert plate divide the cavity into multiple small cavities.

9. The spent fuel assembly container according to claim 7 or 8, characterized in that, A hoop (173) is provided between the support frame (172) and the sealing cylinder (1), and the hoop (173) is used to fill the space between the support frame (172) and the sealing cylinder (1).

10. The spent fuel assembly container according to claim 1, characterized in that, The inner wall of the sealed cylinder (1) includes a second stepped surface (18), which is located on the side of the feed port (19) away from the open end (11); The sealing cap assembly (3) includes an inner cap (31) and an outer cap (32); The outer wall of the inner cover (31) includes an annular protrusion (311) in the middle. The end of the inner cover (31) located away from the outer cover (32) extends into the sealing cylinder (1). The annular protrusion (311) cooperates with the second stepped surface (18). An annular protrusion (321) is provided on the side of the outer cover (32) that fits against the inner cover (31). The annular protrusion (321) is sleeved on the inner cover (31) at the end near the outer cover (32), and the end face of the annular protrusion (321) abuts against the annular protrusion (311). The outer cover (32) is connected to the sealing cylinder (1).

11. The spent fuel assembly container according to claim 10, characterized in that, The inner cover (31) includes an air inlet / outlet (312) and an air outlet (313). The filling and exhaust port (312) is used to fill the sealed cylinder (1) with gas or to exhaust the sealed cylinder (1); The filling and draining port (313) is used to fill the sealing cylinder (1) with water or drain the water from the sealing cylinder (1); The sealed cylinder (1) includes a filling and draining pipe (314) that communicates with the filling and draining port (313).

12. The spent fuel assembly container according to claim 1, characterized in that, The open end (11) is provided with an exhaust hole (111), and the closed end (12) is provided with a water filling hole (121). The shock absorption assembly (2) includes a valve tool interface (23), the valve tool interface (23) located at the open end (11) is connected to the vent (111), and the valve tool interface (23) located at the closed end (12) is connected to the water filling hole (121). The valve tool interface (23) includes a first hole section (233) that mates with a valve tool and a shielding hole section (234) that communicates with an exhaust hole (111) or a water filling hole (121). The shielding hole section (234) is provided with a shielding plug (231). The vent (111) and the water filling hole (121) are provided with screw plugs (232).

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