TWI755898B - Apparatus of dry storage tank cells of used nuclear fuel with design for facility area reduction and seismic enhancement - Google Patents

Abstract

An apparatus is provided for tank cells of dry storage. The tank cells store used nuclear fuel. The apparatus has a design for reducing facility area and enhancing shockproof. The apparatus comprises a plurality of erected retaining tanks, a connecting device, a plurality of concrete plinths, a dividing-wall frame, and at least one work platform. The present invention mainly reveals an apparatus put on the ground, and the apparatus contains the erected retaining tanks made of concrete. The retaining tanks are connected independently for each one with the connecting device made of steel (or reinforced concrete). The space for storing used nuclear fuel can be saved while seismic effect is enhanced. Besides, the work platform is built with dividing walls for worker to benefit in field operation on top of the retaining tanks, to shorten operation time, and to reduce radiation dose received by worker.

Description

Reduced facility area and enhanced earthquake resistance of used nuclear fuel dry storage containment unit design device

The present invention relates to a design device for a dry storage protective box unit of used nuclear fuel that reduces the facility area and strengthens earthquake resistance, especially relates to an innovative storage method, especially refers to saving storage space, increasing the storage capacity of used nuclear fuel, enhancing the Anti-shock effect, easy on-site operation and reduction of radiation dose rate.

Domestic used nuclear fuel is high radiation intensity waste generated by the operation of nuclear power plants. The need for medium-term storage is an important issue that the Chinese government must face in the future. In particular, the amount of used nuclear fuel produced by the operation and power generation of nuclear power plants is quite large, and there is an urgent need for sufficient storage space to meet the needs of medium-term storage of used nuclear fuel. Due to the limitation of the site area for the storage of used nuclear fuel in domestic nuclear power plants, in order to solve the problem of insufficient space for the storage of used nuclear fuel in domestic nuclear power plants, there are relevant references that propose solutions, such as: Taiwan Patent No. TWI459404 The proposed separation method and device for high radiation intensity waste, the mask packaging system for radioactive waste proposed by US Patent No. US10128012B2, the transportation and storage container of spent nuclear fuel proposed by US Patent No. US4666659, and the Patent No. US4666659 proposes the design of a vertical concrete casing for dry storage of nuclear waste fuel sealed steel cylinders.

However, in terms of the lack of the vertical concrete casing (VCC) in the current prior art, it includes:

(1) Generally, considering factors such as radiation and heat dissipation, the distance between the centers of the original two concrete protective boxes 6 for storage is 5.8 meters (as shown in Figure 4), which may easily lead to insufficient storage space.

(2) In Taiwan, if there is an earthquake, the independent concrete protective box is prone to problems such as dumping and movement.

(3) The height of the general independent concrete protective box is more than 5 meters, which causes inconvenience for personnel to operate on the top of the protective box.

In view of the above-mentioned deficiencies and problems of the conventional technologies, the amount of used nuclear fuel generated by the operation of nuclear power plants is quite large and must be properly handled. Therefore, the conventional ones cannot meet the needs of users to increase the storage capacity of used nuclear fuel, enhance the shockproof effect, and have both the simplicity of operation and the reduction of the radiation dose rate in actual use.

The main purpose of the present invention is to overcome the above-mentioned problems encountered in the prior art and provide a vertical concrete protective box on the ground, which can solve the problem of insufficient site space for the storage of used nuclear fuel in domestic nuclear power plants, and expand the storage capacity reduction facility The design of the dry storage tank unit for the used nuclear fuel is designed to area and strengthen the earthquake resistance.

Another object of the present invention is to provide an innovative storage method to achieve a design device for the dry storage and protective box unit of used nuclear fuel, which is easy to operate on site and reduces the radiation dose rate.

In order to achieve the above purpose, the present invention is a design device for a dry storage protective box unit for used nuclear fuel to reduce the facility area and strengthen the earthquake resistance, which includes: a plurality of vertical protective boxes, and each vertical protective box is located in the center of the storage position. The distance from each other is at most 4.5 meters; a connecting member surrounds the outer periphery of each vertical protective box to connect the vertical protective boxes into one; a plurality of concrete plinths (plinth) are arranged on each vertical protective box. The bottom end of the vertical protective box, by limiting the movement range of the vertical protective box, to prevent the vertical protective box from moving due to earthquake; a partition wall assembly, including a boundary partition wall and a middle partition wall, The boundary dividing wall is formed along a boundary area where the vertical protective boxes are arranged, so that the vertical protective boxes are located within the boundary area surrounded by the boundary dividing wall, and the intermediate dividing wall is A plurality of accommodating spaces are formed in the boundary area, each accommodating space accommodates an upright protective box; and a working platform is arranged above the connecting member for personnel to erect operation works on the top of the protective box.

In the above-mentioned embodiments of the present invention, the vertical protective boxes are round or square boxes.

In the above-mentioned embodiments of the present invention, the upright protective boxes may be independent or non-independent protective boxes.

In the above embodiments of the present invention, the independent form of the protective box includes a concrete protective box, a metal protective box or a cellar protective box.

In the above-mentioned embodiment of the present invention, the concrete protective boxes can be arranged in an array of 2x2, 2x3, 2x4, 3x3, 3x4, 4x4, 5x5 or an irregular arrangement.

In the above embodiments of the present invention, the connecting member is a steel structure connecting member or a reinforced concrete connecting member.

In the above-mentioned embodiment of the present invention, the connecting member includes a telescopic rod, two engaging parts and two matching parts between each vertical protective box, and each of the engaging parts is arranged at one end of the telescopic rod, Passed through and clamped on each of the abutting parts, so that the telescopic rod is supported between each vertical protective box.

In the above embodiments of the present invention, the concrete bases are L-shaped or triangular-shaped blocks.

In the above-mentioned embodiments of the present invention, the concrete bases are mainly anchored by steel bars, and an additional anti-slip block is added to prevent the movement of the concrete protective boxes.

In the above-mentioned embodiment of the present invention, the partition wall assembly is formed with an air inlet and an exhaust port on the boundary partition wall that communicate with each of the receiving spaces and the outside world, and the partition wall assembly is formed on the intermediate partition wall. The air inlet and the air outlet communicate with each of the receiving spaces, and the position of the working platform is lower than the exhaust vent.

(Part of the present invention)

1: Vertical protective case

2: Connecting components

21: Telescopic rod

22: Engagement part

23: Conjunction

3: Concrete base

4: Partition wall components

41: Boundary Divider Wall

42: Intermediate dividing wall

421: Containment Space

43: Air intake

44: exhaust port

5: Work Platform

(habitual part)

6: Concrete protective box

Fig. 1 is a three-dimensional schematic diagram of the design device of the dry storage protective box unit for used nuclear fuel according to the present invention.

Fig. 2 is a schematic top view of the design device of the dry-type storage tank unit for used nuclear fuel according to the present invention.

Fig. 3 is a schematic side view of the design device of the dry storage protective box unit for used nuclear fuel according to the present invention.

Figure 4 is a schematic diagram of the center spacing of conventional concrete protective box storage.

Please refer to Figures 1 to 3, which are respectively a three-dimensional schematic diagram of the design device of the used nuclear fuel dry storage protective box unit according to the present invention, and a top schematic view of the design device of the used nuclear fuel dry storage protective box unit according to the present invention. , and the side view schematic diagram of the unit design device of the dry storage protective box for used nuclear fuel of the present invention. As shown in the figure: the present invention is a design device for the dry storage protective box unit of used nuclear fuel to reduce the facility area and strengthen the earthquake resistance, which includes several vertical protective boxes 1, a connecting member 2, several concrete bases (plinth ) 3, a partition wall assembly 4, and a working platform 5 are formed.

The above-mentioned vertical protective case 1 is a round or square case, and can be an independent form or a non-independent form of the protective case. The independent form of the protective box includes a concrete protective box (Vertical Concrete Cask, VCC), a metal protective box or a cellar protective box.

The connecting member 2 surrounds the outer periphery of each upright protective case 1 , and is used to connect the upright protective cases 1 into a whole, so as to prevent the upright protective cases 1 from being overturned due to earthquakes. The connecting member 2 can be a steel connecting member or a concrete connecting member, and the connecting member 2 includes a telescopic rod 21 , two engaging parts 22 and two matching parts 23 between each vertical protective box 1 , each of which is The engaging portion 22 is disposed at one end of the telescopic rod 21 , passes through and is clamped to each of the abutting portions 23 , so that the telescopic rod 21 is supported between each vertical protective case 1 .

The concrete bases 3 are L-shaped or triangular-shaped blocks, which are respectively arranged at the bottom end of each vertical protective box 1 . The protective case 1 was moved by the earthquake.

The partition wall assembly 4 includes a boundary partition wall 41 and an intermediate partition wall 42 . The boundary dividing wall 41 is formed along a boundary area where the vertical protective boxes 1 are arranged, so that the vertical protective boxes 1 are located within the boundary area surrounded by the boundary dividing wall 41 . The middle partition wall 42 forms a plurality of accommodating spaces 421 in the boundary area, and each accommodating space 421 accommodates the vertical protective case 1 . In addition, the partition wall assembly 4 is formed on the boundary partition wall 41 with an air inlet 43 and an exhaust port 44 connecting each of the receiving spaces 421 with the outside world, and the partition wall assembly 4 is formed on the intermediate partition wall 42 There is an air inlet 43 and an air outlet 44 communicating with each of the accommodating spaces 421 .

The working platform 5 is set above the connecting member 2 and is located below the exhaust port 44 for personnel to erect the work on the top of the protective box. In this case, the structure disclosed above constitutes a brand-new design device for the dry storage and protective box unit of used nuclear fuel, which reduces the facility area and strengthens the earthquake resistance.

The following examples are only examples for understanding the details and connotations of the present invention, but are not intended to limit the scope of the patent application of the present invention.

The invention mainly discloses an innovative storage method, so as to save storage space, increase the storage capacity of used nuclear fuel, enhance the anti-shock effect, facilitate on-site operation and reduce the radiation dose rate. The vertical protective box 1 exemplified in this embodiment is a vertical concrete protective box 1 on the ground. First of all, due to the space limitation of used nuclear fuel storage sites in China, it is planned to shorten the distance between the centers of the original two concrete protective boxes 1 from 5.8 meters (see Figure 4) to 4.5 meters (as shown in Figures 1 to 3). shown) to expand the storage capacity. Connect the original 4 independent concrete protective boxes 1 through the steel structure (or reinforced concrete) to connect the components 2, so that they can be integrated into one (see Figures 1 and 2), and the bottom area will be enlarged. Reduce the possibility of its overturning to achieve a good shockproof effect; and, the 2x2 row in the 1st and 2nd pictures The column method is only one embodiment, but is not limited to a specific number of combinations (for example, it can be arranged into 2x3, 2x4, 3x3, 3x4, 4x4, 5x5...or other arrays or irregular combinations as required). In addition, the design of the concrete base 3 can prevent the concrete protective box 1 from moving due to earthquakes and improve the safety of nuclear fuel storage. The anti-slip stop is supplemented. In addition, in order to make the operation smoother, a working platform 5 and a partition wall assembly 4 are built between the independent concrete protective boxes 1, which can facilitate the on-site operation of the personnel on the top of the protective box, which is beneficial to shorten the operation time and expose the personnel to the radiation dose time. It can work in a safer environment and effectively reduce the radiation dose rate of the operator. As for heat dissipation, considering that the distance between the centers of the independent concrete protective boxes 1 is reduced to 4.5 meters, the design of the protective box unit of the present invention can also meet the heat dissipation standard. For example, in the present invention, a boundary partition wall 41 and an intermediate partition wall 42 are added around the periphery of the concrete protective box 1, and inlet and exhaust ports 43 and 44 are added on the partition walls 41 and 42 to maintain the original heat dissipation channel. Therefore, It will not affect its cooling function.

Thereby, the present invention develops a vertical concrete protective box on the ground, which can solve the problem of insufficient space for the storage of used nuclear fuel in domestic nuclear power plants, and expand the storage capacity. The effects it can produce are as follows:

1. The steel structure (or reinforced concrete) connecting members are connected to the independent concrete protective box to save the storage space of used nuclear fuel and enhance the shockproof effect.

2. The method of building a working platform increases the convenience of operation and reduces the radiation dose rate received by the operator.

3. Use the partition wall to reduce the radiation dose received by the operator.

To sum up, the present invention is a design device for a dry-type nuclear fuel storage protective box unit that reduces the facility area and strengthens earthquake resistance, which can effectively improve various shortcomings of conventional use. It mainly discloses a vertical concrete protective box on the ground, with steel structure ( or reinforced concrete) connecting members to the independent concrete protective box, which can save the used nuclear fuel storage space and enhance the anti-vibration effect, and build a working platform and partition wall, which can make it convenient for personnel to operate on the top of the protective box, shorten the operation time and Reduce operator spokes The dose rate of the present invention can be further improved, more practical, and more in line with the needs of users. It has indeed met the requirements for an invention patent application, and a patent application can be filed in accordance with the law.

However, the above are only preferred embodiments of the present invention, and should not limit the scope of implementation of the present invention; therefore, any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the description of the invention , shall still fall within the scope covered by the patent of the present invention.

1: Vertical protective case

2: Connecting components

21: Telescopic rod

22: Engagement part

23: Conjunction

3: Concrete base (plinth)

4: Partition wall components

41: Boundary Divider Wall

42: Intermediate dividing wall

421: Containment Space

43: Air intake

44: exhaust port

5: Work Platform

Claims (10)

A design device for a dry storage protective box unit for used nuclear fuel to reduce facility area and strengthen earthquake resistance, comprising: a plurality of vertical protective boxes, the center distance of each vertical protective box in the storage position is at most 4.5 meters from each other; a A connecting member surrounds the outer circumference of each vertical protective box, and is used to connect the vertical protective boxes into one body to prevent the vertical protective boxes from being overturned due to earthquakes; several concrete bases (plinth), divided into Set at the bottom end of each vertical protective box, by limiting the movement range of each vertical protective box, to prevent each vertical protective box from moving due to earthquake; a partition wall assembly, including boundary partition wall and intermediate partition A wall, the boundary dividing wall is formed along a boundary area where the vertical protective boxes are arranged, so that the vertical protective boxes are located within the boundary area surrounded by the boundary dividing wall, and the intermediate partition The wall system forms several accommodating spaces in the boundary area, and each accommodating space accommodates a vertical protective box; and a working platform is arranged above the connecting member for personnel to erect operation works on the top of the protective box. According to item 1 of the scope of the patent application, the design device for the dry storage tank unit for used nuclear fuel to reduce the facility area and strengthen the earthquake resistance, wherein the vertical protection tanks are round or square boxes. According to the design device of the used nuclear fuel dry storage tank unit to reduce the facility area and strengthen the earthquake resistance as described in item 1 of the scope of the application, the vertical protection tanks can be independent or non-independent types of protection tanks. According to the design device of the dry storage tank unit for used nuclear fuel to reduce the facility area and strengthen the earthquake resistance as described in item 3 of the scope of the patent application, the independent form of the protection box includes a concrete protection box, a metal protection box or a cellar type protection box . According to item 1 of the scope of the patent application, the design device for the dry storage tank unit of used nuclear fuel to reduce the facility area and strengthen the earthquake resistance, wherein, the vertical protection tanks can be arranged into 4x4, 5x5 array or irregular arrangement. According to the first item of the scope of application for reducing the facility area and strengthening the earthquake resistance of the used nuclear fuel dry storage tank unit design device, wherein the connecting member is a steel connecting member or a reinforced concrete connecting member. According to the first item of the scope of the patent application, the design device of the used nuclear fuel dry storage tank unit for reducing the facility area and strengthening the earthquake resistance, wherein the connecting member includes a telescopic rod, two An engaging portion and two opposing portions, each engaging portion is disposed at one end of the telescopic rod, passes through and is clamped to each opposing portion, so that the telescopic rod is supported between each vertical protective case . According to the design device of the used nuclear fuel dry storage tank unit for reducing the facility area and strengthening the earthquake resistance as described in item 1 of the scope of the application, the concrete bases are L-shaped or triangular-shaped blocks. According to the design device of the used nuclear fuel dry storage protective box unit to reduce the facility area and strengthen the earthquake resistance described in the first item of the scope of the application, the concrete bases are mainly embedded with steel reinforcement (anchor), and additionally Sliding blocks are supplemented to prevent the upright boxes from tipping or moving. According to the design device of the used nuclear fuel dry storage protective box unit that reduces the facility area and strengthens the earthquake resistance as described in item 1 of the scope of the patent application, wherein the partition wall component is formed on the boundary partition wall to communicate with each of the storage spaces and the The air inlet and air outlet of the outside world, the partition wall assembly is formed with air inlet and air outlet communicating with each of the receiving spaces on the middle partition wall, and the position of the working platform is lower than the air outlet .

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