Spent fuel storage well for test and design and construction method

Abstract

The invention relates to the technical field of spent fuel storage, and discloses a spent fuel storage well for a test and a design construction method.The spent fuel storage well for the test is characterized in that an air inlet channel is arranged in the vertical direction, and ventilation is conducted in the air inlet channel from top to bottom; one end of the lower air chamber is communicated with the lower end of the air inlet channel; the upper air chamber is positioned above the lower air chamber; the upper air chamber is communicated with an exhaust channel which is vertically arranged; the storage chamber is positioned between the upper air chamber and the lower air chamber; the upper air chamber is communicated with the upper end of the storage chamber; the multiple storage unit assemblies are arranged in the storage chamber at intervals and serve as containers for containing the simulated spent fuel. Simulated spent fuel is placed in the storage unit assembly through the spent fuel storage well for testing, and the difficulty of experimental research of a spent fuel dry storage ventilation technology is overcome; the ventilation cooling effect of the whole storage chamber under extreme climates such as windless climates and high-temperature climates can be researched, so that basic test research can be better carried out.

Description

Technical Field

[0001] This invention relates to the field of spent fuel storage technology, specifically to an experimental spent fuel storage well and its design and construction method. Background Technology

[0002] Existing dry storage methods for spent fuel are generally designed with equipment, structures, processes, and methods tailored to specific application conditions.

[0003] For simulating the heat source of spent fuel, a dry storage facility with a heat source can be used for testing. This dry storage facility removes decay heat through metered ventilation. Experimental studies on the natural ventilation conditions and structural design of the dry storage facility with a heat source can ensure the safe removal of residual heat under both normal and extreme operating conditions, providing important theoretical basis for the design of subsequent spent fuel reprocessing plants.

[0004] However, the existing technology lacks basic experimental facilities for testing dry storage of heating elements. Summary of the Invention

[0005] In view of this, the present invention provides a test spent fuel storage well to solve the problem of the lack of basic test facilities for testing dry storage tanks for heating elements.

[0006] In a first aspect, the present invention provides an experimental spent fuel storage well, comprising:

[0007] An air intake duct is provided vertically and is adapted to introduce ventilation from top to bottom; The lower air chamber is located below the air inlet channel, and one end of the lower air chamber is connected to the lower end of the air inlet channel; An upper air chamber is located above the lower air chamber; the upper air chamber is adapted to communicate with a vertically arranged exhaust duct; A storage chamber is located between the upper air chamber and the lower air chamber; and the lower air chamber is connected to the lower end of the storage chamber, while the upper air chamber is connected to the upper end of the storage chamber. Multiple storage unit components are spaced apart within the storage chamber, and these storage unit components are suitable as containers for holding simulated spent fuel. Beneficial effects: This application adopts the above technical solution, using an experimental spent fuel storage well and placing simulated spent fuel within the storage unit components, overcoming the difficulties in experimental research on dry storage ventilation technology for spent fuel; it allows for the study of the overall ventilation and cooling effect of the storage chamber under extreme climates such as windless and high-temperature conditions, thus facilitating better fundamental experimental research.

[0008] Optionally, the air inlet duct is formed by an outer wall and an air inlet side wall arranged vertically at intervals; the lower air chamber is formed by a horizontally arranged bottom wall, an exhaust side wall arranged vertically at intervals from the air inlet side wall, and the bottom surface of the storage chamber; the upper air chamber is formed by an air inlet side wall, a horizontally arranged top wall, and the top surface of the storage chamber.

[0009] Optionally, the exterior wall, air inlet side wall, bottom wall, air outlet side wall, and top wall are all concrete walls.

[0010] Optionally, the storage unit assembly includes: The inner cylinder contains a heating rod installed vertically inside, which is suitable for simulating spent fuel. An outer cylinder is spaced out and fitted around the inner cylinder, with the portions of the outer cylinder near the upper and lower ends fixedly installed at the upper and lower ends of the inner cylinder, respectively; a heat dissipation annular cavity is formed between the outer cylinder and the inner cylinder, and the upper and lower ends of the outer cylinder are respectively installed at the upper and lower ends of the storage chamber.

[0011] Optionally, both the inner and outer cylinders are made of stainless steel.

[0012] Optionally, temperature sensors are respectively installed on the walls of the inner cylinder, outer wall, air inlet side wall, bottom wall, air outlet side wall, and top wall. These temperature sensors are adapted to acquire the temperature at their respective locations. The temperature sensors are signal-connected to an alarm controller. When the temperature of a temperature sensor exceeds a set temperature, the alarm controller issues an over-temperature risk alarm for the corresponding sensor location. Beneficial effect: By adopting the above technical solution, this application can achieve over-temperature risk early warning at key locations in the experimental storage well by monitoring the wall temperature of the inner cylinder and the outer wall.

[0013] Optionally, the upper and lower ends of the heating rod are respectively concentrically fixed to the inner cylinder by a first fixing component; the portions of the outer cylinder near the upper and lower ends are respectively fixedly installed on the upper and lower ends of the inner cylinder by a second fixing component; the upper and lower ends of the outer cylinder are respectively installed on the upper and lower ends of the storage chamber by welded flanges. Beneficial effect: This application adopts the above technical solution, and the flanges facilitate assembly.

[0014] Optionally, an air inlet valve is provided in the air inlet channel. Beneficial effect: By adopting the above technical solution, this application utilizes the function of the air inlet valve to study corresponding airflow regulation and control methods.

[0015] Optionally, a first fixing plate is provided at the lower end of the storage chamber, and a second fixing plate is provided at the upper end of the storage chamber; a plurality of corresponding circular holes are provided on the first fixing plate and the second fixing plate respectively, and the storage unit assembly is installed into the circular holes.

[0016] Secondly, the present invention also provides a design and construction method for the aforementioned experimental spent fuel storage well, comprising: Determine the dimensions and clearances of the air inlet duct, lower air chamber, upper air chamber, storage chamber, and storage unit components; determine the number and arrangement of multiple storage unit components; Processing and storing unit components; Construct an air intake duct, a downwind chamber, an open upwind chamber, and a storage room; Install storage unit components inside the storage room; The upper wind chamber was sealed off. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic cross-sectional view of the experimental spent fuel storage well provided in an embodiment of the present invention. Figure 2 This is a cross-sectional structural diagram of the storage unit assembly provided in an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures: 1. Exterior wall; 2. Bottom wall; 3. Top wall; 4. Air inlet side wall; 5. Air exhaust side wall; 6. Air inlet duct; 7. Air inlet valve; 8. Lower air chamber; 9. First fixing plate; 10. Storage chamber; 11. Storage unit assembly; 12. Outer cylinder; 13. Inner cylinder; 14. Heating rod; 15. First fixing assembly; 16. Second fixing assembly; 17. Flange; 18. Heat dissipation ring cavity; 19. Second fixing plate; 20. Upper air chamber. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figures 1 to 2One specific embodiment of the experimental spent fuel storage well shown includes: an air intake passage 6, a lower air chamber 8, an upper air chamber 20, a storage chamber 10, and multiple storage unit assemblies 11. The experimental spent fuel storage well described in this application is suitable for dry storage tests of spent fuel.

[0022] like Figure 1 As shown, the air inlet channel 6 is arranged vertically and is adapted to introduce ventilation from top to bottom. A fan can be used to introduce air into the air inlet channel 6. The lower air chamber 8 is located below the air inlet channel 6, and one end of the lower air chamber 8 is connected to the lower end of the air inlet channel 6. The upper air chamber 20 is located above the lower air chamber 8; the upper air chamber 20 is adapted to communicate with a vertically arranged exhaust channel. The storage chamber 10 is located between the upper air chamber 20 and the lower air chamber 8; the lower air chamber 8 is connected to the lower end of the storage chamber 10, and the upper air chamber 20 is connected to the upper end of the storage chamber 10. Multiple storage unit assemblies 11 are spaced apart within the storage chamber 10, and each storage unit assembly 11 is adapted to serve as a container for storing simulated spent fuel. The multiple storage unit assemblies 11 can be arranged in a row.

[0023] Specifically, such as Figure 1 As shown, the air inlet channel 6 is enclosed by an outer wall 1 and an air inlet side wall 4 arranged vertically at intervals; the lower air chamber 8 is enclosed by a horizontally arranged bottom wall 2, an exhaust side wall 5 arranged vertically at intervals from the air inlet side wall 4, and the bottom surface of the storage chamber 10; the upper air chamber 20 is enclosed by the air inlet side wall 4, a horizontally arranged top wall 3, and the top surface of the storage chamber 10. The air inlet side wall 4 and the exhaust side wall 5 can serve as the side walls of the storage chamber 10. The exhaust side wall 5 extends downward to block the other end of the lower air chamber 8, and the air inlet side wall 4 extends upward to serve as the side wall of the upper air chamber 20.

[0024] Specifically, the outer wall 1, the air inlet side wall 4, the bottom wall 2, the air outlet side wall 5, and the top wall 3 are all concrete walls.

[0025] Specifically, such as Figure 2 As shown, the storage unit assembly 11 includes an inner cylinder 13 and an outer cylinder 12. A heating rod 14 is vertically mounted inside the inner cylinder 13, located at the center of the inner cylinder 13; the heating rod 14 is adapted to simulate spent fuel. The heating rod 14 is the heat source simulating spent fuel. The outer cylinder 12 is spaced around the outside of the inner cylinder 13, and the portions of the outer cylinder 12 near its upper and lower ends are fixedly installed at the upper and lower ends of the inner cylinder 13, respectively; a heat dissipation annular cavity 18 is formed between the outer cylinder 12 and the inner cylinder 13, and the upper and lower ends of the outer cylinder 12 are respectively installed at the upper and lower ends of the storage chamber 10. The inner cylinder 13, outer cylinder 12, and heating rod 14 constitute an electrically heated simulation body.

[0026] Specifically, both the inner cylinder 13 and the outer cylinder 12 are stainless steel cylinders.

[0027] Furthermore, temperature sensors are respectively installed on the walls of the inner cylinder 13, outer wall 1, air inlet side wall 4, bottom wall 2, air outlet side wall 5, and top wall 3. The temperature sensors are adapted to obtain the temperature at the corresponding set position. The temperature sensors are connected to the alarm controller. When the temperature of the temperature sensor exceeds the set temperature, the alarm controller issues an over-temperature risk alarm at the corresponding temperature sensor position.

[0028] Specifically, such as Figure 2 As shown, the upper and lower ends of the heating rod 14 are respectively fixed to the inner cylinder 13 concentrically by the first fixing component 15; the parts of the outer cylinder 12 near the upper and lower ends are respectively fixed to the upper and lower ends of the inner cylinder 13 by the second fixing component 16; the upper and lower ends of the outer cylinder 12 are respectively installed at the upper and lower ends of the storage chamber 10 by welded flanges 17.

[0029] Furthermore, an air inlet valve 7 is provided within the air inlet channel 6. Through the action of the air inlet valve 7 and the fan, corresponding airflow regulation and control methods can be studied.

[0030] Specifically, such as Figure 1 As shown, a first fixing plate 9 is provided at the lower end of the storage chamber 10, and a second fixing plate 19 is provided at the upper end of the storage chamber 10; both the first fixing plate 9 and the second fixing plate 19 are horizontally arranged. Multiple corresponding circular holes are provided on the first fixing plate 9 and the second fixing plate 19, and the storage unit assembly 11 is installed into the circular holes. Both the first fixing plate 9 and the second fixing plate 19 can be steel plates. One end of the first fixing plate 9 can be embedded and fixed to the side of the air inlet wall 4, and the other end of the first fixing plate 9 can be embedded and fixed to the top surface of the air outlet wall 5; one end of the second fixing plate 19 can be embedded and fixed to the air inlet wall 4 near the bottom surface, and the other end of the second fixing plate 19 can be embedded and fixed to the side of the air outlet wall 5.

[0031] This application also proposes a design and construction method for the aforementioned experimental spent fuel storage well, comprising the following steps: S1. Determine the dimensions and clearances of the air intake duct 6, lower air chamber 8, upper air chamber 20, storage chamber 10, and storage unit assembly 11; determine the number and arrangement of multiple storage unit assemblies 11. Dimensions include: length, width, and height; clearances include: ventilation clearances, etc. Further determine the external dimensions of the entire spent fuel storage well for the test.

[0032] S2. Process the storage unit assembly 11 to ensure that the flange 17 is firmly welded.

[0033] S3. Construct an air intake duct 6, a downwind chamber 8, an unsealed upwind chamber 20, and a storage chamber 10.

[0034] S4. Install the storage unit assembly 11 in the storage chamber 10 and ensure that the storage unit assembly 11 is securely fixed.

[0035] S5, the upper wind chamber is capped at 20.

[0036] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A test spent fuel storage well, characterized in that, include: An air inlet channel (6) is provided in a vertical direction, and the air inlet channel (6) is adapted to introduce ventilation from top to bottom; The lower air chamber (8) is located below the air inlet channel (6), and one end of the lower air chamber (8) is connected to the lower end of the air inlet channel (6); An upper air chamber (20) is located above the lower air chamber (8); the upper air chamber (20) is adapted to communicate with a vertically arranged exhaust duct; The storage chamber (10) is located between the upper air chamber (20) and the lower air chamber (8); and the lower air chamber (8) is connected to the lower end of the storage chamber (10), and the upper air chamber (20) is connected to the upper end of the storage chamber (10); Multiple storage unit assemblies (11) are spaced apart within the storage chamber (10), and the storage unit assemblies (11) are adapted to serve as containers for storing simulated spent fuel.

2. The experimental spent fuel storage well according to claim 1, characterized in that, The air inlet channel (6) is formed by the vertically spaced outer wall (1) and the air inlet side wall (4); the lower air chamber (8) is formed by the horizontally arranged bottom wall (2), the vertically spaced exhaust side wall (5) and the bottom surface of the storage chamber (10); the upper air chamber (20) is formed by the air inlet side wall (4), the horizontally arranged top wall (3), and the top surface of the storage chamber (10).

3. The experimental spent fuel storage well according to claim 2, characterized in that, The outer wall (1), the air inlet side wall (4), the bottom wall (2), the air outlet side wall (5), and the top wall (3) are all concrete walls.

4. The experimental spent fuel storage well according to any one of claims 1-3, characterized in that, The storage unit assembly (11) includes: The inner cylinder (13) has a heating rod (14) installed vertically inside, which is suitable for simulating spent fuel; The outer cylinder (12) is spaced outside the inner cylinder (13), and the parts of the outer cylinder (12) near the upper and lower ends are respectively fixedly installed at the upper and lower ends of the inner cylinder (13); a heat dissipation annular cavity (18) is formed between the outer cylinder (12) and the inner cylinder (13), and the upper and lower ends of the outer cylinder (12) are respectively installed at the upper and lower ends of the storage chamber (10).

5. The experimental spent fuel storage well according to claim 4, characterized in that, Both the inner cylinder (13) and the outer cylinder (12) are stainless steel cylinders.

6. The experimental spent fuel storage well according to claim 4, characterized in that, Temperature sensors are provided on the walls of the inner cylinder (13), outer wall (1), air inlet side wall (4), bottom wall (2), air outlet side wall (5) and top wall (3), respectively. The temperature sensors are adapted to obtain the temperature at the corresponding set position. The temperature sensors are connected to the alarm controller. When the temperature of the temperature sensor exceeds the set temperature, the alarm controller issues an over-temperature risk alarm at the corresponding temperature sensor position.

7. The experimental spent fuel storage well according to claim 4, characterized in that, The upper and lower ends of the heating rod (14) are respectively fixed to the inner cylinder (13) concentrically by the first fixing component (15); the parts of the outer cylinder (12) near the upper and lower ends are respectively fixed to the upper and lower ends of the inner cylinder (13) by the second fixing component (16); the upper and lower ends of the outer cylinder (12) are respectively installed to the upper and lower ends of the storage chamber (10) by welded flanges (17).

8. The experimental spent fuel storage well according to any one of claims 1-3, characterized in that, An air inlet valve (7) is provided in the air inlet channel (6).

9. The experimental spent fuel storage well according to any one of claims 1-3, characterized in that, A first fixing plate (9) is provided at the lower end of the storage chamber (10), and a second fixing plate (19) is provided at the upper end of the storage chamber (10); a plurality of circular holes corresponding to each other are provided on the first fixing plate (9) and the second fixing plate (19), and the storage unit assembly (11) is installed into the circular holes.

10. A design and construction method for an experimental spent fuel storage well according to any one of claims 1-9, characterized in that, include: Determine the dimensions and clearances of the air intake duct (6), the lower air chamber (8), the upper air chamber (20), the storage chamber (10), and the storage unit assembly (11); determine the number and arrangement of the multiple storage unit assemblies (11); Processing and storage unit components (11); Construct an air intake duct (6), a downwind chamber (8), an unsealed upwind chamber (20), and a storage room (10); Install storage unit components (11) inside the storage room (10); The upper wind chamber (20) was sealed.

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