GB2543461A

GB2543461A - Containment building of nuclear power plant having passive type cooling structure

Info

Publication number: GB2543461A
Application number: GB1702083.5A
Authority: GB
Inventors: Chan Kang Hie; Sun Park Hyun
Original assignee: Industry Academic Cooperation Foundation of Kunsan National University
Current assignee: Industry Academic Cooperation Foundation of Kunsan National University
Priority date: 2014-07-23
Filing date: 2015-07-23
Publication date: 2017-04-19
Anticipated expiration: 2035-07-23
Also published as: GB201702083D0; WO2016013883A1; GB2543461B

Abstract

The present invention provides a containment building of a nuclear power plant, comprising: a building body part having a sidewall part and a roof part; a plurality of internal fins which are installed inside the building body part and formed of a metal material; a plurality of external fins which are installed outside the building body part and formed of a metal material; and a fin connecting part, formed of a metal material, for connecting the internal fins with the external fins.

Description

CONTAINMENT BUILDING OF NUCLEAR POWER PLANT HAVING PASSIVE

TYPE COOLING STRUCTURE

BACKGROUND

Technical Field

The present invention relates to a containment building structure for an atomic power plant, and in particular to a containment building structure for an atomic power plant which is able to provide a good passive form cooling performance against any accident.

Background Art

The containment building for an atomic power plant has an air tightness and a pressure resisting quality and is designed to prevent a radioactive substance from leaking out to the outside in case of any emergency situation, for example, an accident, etc., while accommodating a nuclear reactor and other auxiliary devices (a vapor generator, a pressurizer, a coolant pump, etc.).

The aforementioned containment building, in general, is designed to endure an atmosphere higher than a design atmosphere (generally 5atm) even though it becomes a high pressure state due to the leakage of gas including vapor from the inside thereof. In order to keep an atomic power plant safe by maintaining a reliable safety of the containment building, it needs to lower the pressure of the containment building, and the most effective way is to substantially remove the vapor from the inside of the containment building in such a way to cool the containment building.

The atomic power plant is equipped with an active form cooling device which is designed to use an external electric power, but it may be impossible to maintain a reliable safety of the containment building if the active form cooling device doesn’t work in case where an external electric power supply is interrupted during a predetermined accident, the situation of which actually took place at the Japan Fukushima atomic power plant. To this end, a passive form cooling system was necessarily developed, which does not need any external electric power. This system is actually being used, for example, at a pressurized water reactor (AP100) type atomic power plant by Westinghouse Corporation. In this technology, it is possible to discharge any remaining heat from the nuclear reactor with the aid of a steel containment building the thermal conductivity of which is very high, without using any heat exchanger.

SUMMARY OF THE DISCLOSURE

Accordingly, it is an object of the present invention to provide a containment building structure for an atomic power plant which is able to provide a good passive form cooling performance.

It is another object of the present invention to provide a containment building structure for an atomic power plant which is equipped with a fin structure providing an enhanced drainage performance.

It is another object of the present invention to provide a containment building structure for an atomic power plant which is able to prevent a dew condensation.

It is another object of the present invention to provide a containment building structure which is equipped with a fin structure providing an enhanced heat radiation effect.

It is another object of the present invention to provide a containment building structure which is able to provide an enhanced pressure resisting quality.

To achieve the above objects, according to an aspect of the present invention, there is provided a containment building structure for an atomic power plant, which may include a building body part which is formed of a side wall part and a roof part; a plurality of inner fins which are installed inside of the building body part, wherein the inner fins are made of metallic materials; a plurality of outer fins which are installed outside of the building body part, wherein the outer fins are made of metallic materials; and a fin connection part which is configured to connect the inner fins and the outer fins, wherein the fin connection part is made of a metallic material.

The containment building structure for an atomic power plant further includes an inner liner which is installed at the inner surface of the building body part, wherein the inner liner is made of a metallic material, and an outer liner which is installed at the outer surface of the building body part, wherein the outer liner is made of a metallic material.

The building body part is configured in a reinforced concrete structure, and the fin connection part is a steel reinforcement of the building body part.

The fin connection part may include a fin support rod which is installed passing through the building body part, wherein both ends of the fin support rod are connected to the inner fin and the outer fin, respectively. A cooling flow path is formed inside of the fin support rod, wherein an externally supplied cooling water can flow through the cooling path. A spray nozzle is provided at an outer side if the containment building and is connected to an exit of the cooling flow path.

The building body part is configured in a reinforced concrete structure, and the fin connection part includes an inner side fin support rod which is connected with the inner fin and is installed embedded in the inside of the building body part and is connected to a steel reinforcement of the building body part, and an outer side fin support rod which is connected with the outer fin and is installed embedded in the outside of the building body part and is connected to a steel reinforcement of the building body part.

The containment building structure for an atomic power plant may further include a fin connection structure which is able to connect the inner fin and the outer fin to the fin connection part.

The fin connection structure may include a connection part side male thread part formed at the fin connection part, a fin side male thread part formed at the fin, and an engaging bolt which is engaged to both the connection part side male thread part and the fin side male thread part.

The connection structure further may include an auxiliary bolt which is engaged to the fin side male thread part and is contacting with the engaging bolt.

The inner fin or the outer fin is connected with the fin connection part by a welding or adhering method.

The inner fin or the outer fin may include an extension part which is extending protruding from the inner surface or the outer surface of the building body part, and an expansion part which is expanding at a predetermined angle with respect to the extension part.

The expansion part may include a central part which is connected to the extension part, and a branch part which is extending in a radial shape from the central part.

The expansion part may include a first bar part which is connected with the extension part and is extending rectilinearly, and a plurality of second bar parts which are connected to the first bar part.

The first bar part is extending in a horizontal direction, and a plurality of the second bar parts are branched in a tree bough shape at a predetermined angle with respect to the first bar part.

The extension part positions at a central part of the first bar part, and the lengths of a plurality of the second bar parts are gradually getting shorter as they are getting farther from the center of the first bar part.

The expansion parts of the inner fins engaged to a region where an angle formed with respect to a vertical line segment at the inner surface of the building body unit among a plurality of the inner fins is over 30°, are connected with each other.

The inner fin and the outer fin are super-hydrophilically surface-treated for the equilibrium contact angle of the surface thereof to be below 30° or are super-hydrophobically surface-treated for the same to be over 160°.

The surface of the outer fin is surface-treated using a paint the surface emissivity of which is below 0.2.

The inner fin and the outer fin are made of a steel or aluminum material.

The building body part is made of a steel material.

The surface area of the outer fin is preferably larger than the surface area of the inner fin.

Each of the inner fin and the outer fin may include an extension part which is extending protruding from the inner surface of the building body part, and an expansion part which is expanding at a predetermined angle with respect to the extension part, and the expansion parts of the inner fins are connected along a circumference direction of the building body part, and the expansion parts of the outer fins are connected along a circumference direction of the building body part.

ADVANTAGEOUS EFFECTS

All the aforementioned objects of the present invention can be achieved. More specifically, the cooling performance can be enhanced since a fin made of a metallic material is connected to both the inside and outside of the containment building. A danger reaching time can be prolonged since a basic heat radiation amount can be increased in the present invention even in case where an active form system of a containment building does not work due to a critical accident. Ultimately, it is possible to secure a time to cope with any emergency situation outside the system, and it is possible to easily keep an atomic power plant safe after the emergency situation has been eliminated.

Moreover, since the surface area of each external fin is formed larger than the surface area of an inner fin, it is possible to obtain a much more enhanced natural heat radiation effect.

Furthermore, a plurality of inner fins are disposed connected in a circumference direction in the inside of a building body part, and a plurality of outer fins are disposed connected in a circumference direction in the outside of the building body part, by which the pressure resisting quality of the containment building can be enhanced.

In addition, a steel liner is disposed at both the inner and outer surfaces of the building body part, so a radioactive leakage prevention effect can be enhanced.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features of the present invention will now be described in detail with reference to certain exemplary embodiments thereof illustrated the accompanying drawings which are given hereinbelow by way of illustration only, and thus are not limitative of the present invention, and wherein:

Figure 1 is a schematic cross sectional view illustrating the configuration of a containment building structure for an atomic power plant according to an embodiment of the present invention;

Figure 2 is an enlarged cross sectional view illustrating a configuration wherein an inner fin and an outer fin are engaged to a building body part in Figure 1;

Figure 3 is a cross sectional view illustrating an inner fin connection structure in Figure 2;

Figure 4 is a cross sectional view illustrating an outer fin connection structure in Figure 2;

Figure 5 is a view illustrating an expansion part of an inner fin in Figure 2;

Figures 6, 7 and 8 are views illustrating other examples of an expansion part of an inner fin in Figure 5;

Figure 9 is an enlarged cross sectional view illustrating another example of a configuration wherein an inner fin and an outer fin are engaged to a building body part in Figure i;

Figure 10 is an enlarged cross sectional view illustrating further another example of a configuration wherein an inner fin and an outer fin are engaged to a building body part in Figure i;

Figure 11 is a cross sectional view illustrating further another example of a configuration wherein a cooling water is supplied in the configuration in Figure 9;

Figure 12 is a schematic cross sectional view illustrating a vertical cross sectional configuration of a containment building of an atomic power plant according to further another embodiment of the present invention;

Figure 13 is an enlarged schematic cross sectional view illustrating a configuration wherein an inner fin and an outer fin are engaged to a building body part in Figure 12; and

Figure 14 is a schematic cross sectional view illustrating a horizontal cross sectional configuration of a containment building in Figure 12.

DKTAII I I) DESCRIPTION

The configuration and operations according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

Figure 1 is a schematic view illustrating a containment building of an atomic power plant according to an embodiment of the present invention, and Figure 2 is an enlarged view illustrating a part of the configuration in Figure 1. Referring to Figures 1 and 2, a containment building 100 of an atomic power plant according to an embodiment of the present invention may include a building body part 110 configured to provide a closed space in the inside thereof, an inner liner 113 which is made of a metallic material and is attached to the inner surface of the building body part 110, a plurality of inner fins 120 which are disposed inside the building body part 110 and are connected to the inner liner 113 and are made of metallic materials, and a plurality of outer fins 130 which are configured to be engaged to the outer surface of the building body part 110 and are made of metallic materials. The safety of the containment building 100 can be obtained since the saturated pressure of the vapor-mixed gas inside the containment building 100 lowers by the heat radiation which can be carried out with the aid of the inner fins 120 and the outer fins 130 when a predetermined accident occurs.

The building body part 110 may be configured to provide a predetermined space in the inside thereof, wherein an unclear reactor, a vapor generator, a pressurizer, a coolant pump, etc. can be accommodated. The building body part 110 may include a side wall part 111 which is mainly disposed vertical and has a circular horizontal cross section profile, and a dome-shaped roof part 115 which position on the top of the side wall part 111. The building body part 110 is made in a reinforced concrete structure formed of a steel reinforcement part 116 and a concrete part 119. The steel reinforcement part 116 may include a fin support rod 117 which extends in the thickness direction of the concrete part 119 and passes through the concrete part 119 and the inner liner 113, and another steel reinforcement 118 which is linked with the fin support rod 117. The fin support rod 117 is an example of the fin connection part according to the present invention. Both ends of the fin support rod 117 are protruding from the inner and outer surfaces of the building body part 110 and subsequently are coupled to the inner fin 120 and the outer fin 130, respectively. The fin support rod 117 may be disposed in such a way that it is additionally inserted into the building body part 110 of the conventional reinforced concrete structure. It is preferred that the surface area where the fin support rod 117 occupies in the surface which is disposed vertical to the thickness direction of the building body part 110, is 4% wider than the surface area where the concrete part 119 occupies. For this reason, the heat resistance of the wall body can be reduced in half.

The inner liner 113 may be made of a metallic material and may be installed attached to the inner surface of the building body part 110. The inner liner 113 may be connected with a plurality of inner fins 120. While the liner has been described as being installed only at the inner surface of the building body part 110 in this embodiment, different from the aforementioned configuration, it is can be installed at both the inner and outer surfaces of the building body part 110. This configuration is also included in the scope of the present invention. Any cracks may be likely to occur at the outer side of the containment building, rather than at the inner side thereof, thanks to the material characteristic of the concrete which has a compressive strength higher than the tensile strength, whereupon the liner installed at the outer surface can enhance the leakage prevention effect of any radioactive substance.

The inner fin 120 may be installed inside the building body part 110 and may be connected with the inner liner 113. The inner fin 120 may include an extension part 121 which is disposed protruding almost at a right angle with respect to the inner surface of the building body part 110, and an expansion part 125 which is expanding from an end portion of the extension part 121 and at almost at a right angle with respect to the extension part 121. Figure 5 is a view illustrating the profile of the expansion part 125. Referring to Figure 5, the expansion part 125 may include a central part 126 which is connected to an end portion of the extension part 121, and a plurality of branch parts 127 which are projecting outward in a radial shape from the central part 126. In this embodiment, the inner fin 120 may be made of a steel or aluminum material, and the inner fin 120 may be connected with the inner liner 113.

Figures 6, 7 and 8 are views illustrating other types of expansion parts. Referring to Figure 6, the expansion part 225 may include a first bar part 226 which is connected with the extension part 121 and extends rectilinearly, and a plurality of second bar parts 227 which are connected to the first bar part 226. The first bar part 226 is disposed extending in a horizontal direction, and an end portion of the extension part 121 is connected to the center thereof. A plurality of the second bar parts 227 are arranged one by one in the extending direction of the first bar part 226. Each of the second bar parts 227 is disposed extending at a right angle with respect to the first bar part 226.

Referring to Figure 7, the expansion part 325 may include a first bar part 226 which is connected with the extension part 121 and extends rectilinearly, and a plurality of second bar parts 327a, 327b, 327c, 327d and 327e which are connected to the first bar part 226. The first bar part 226 extends in a horizontal direction, and an end portion of the extension part 121 is connected to the center thereof. A plurality of the second bar parts 327a, 327b, 327c, 327d and 327e are arranged one by one in the extending direction of the first bar part 226 and are extending at a right angle with respect to the first bar part 226. The lengths of the second bar parts 327a, 327b, 327c, 327d and 327e are gradually getting shorter as they are getting farther from the center of the first bar part 226.

Referring to Figure 8, the expansion part 425 may include a central part 426 which is connected with an end portion of the extension part 121, a plurality of branch parts 427 which are disposed extending outward in a radial shape from the central portion 426, and protrusion parts 428a and 428b which are extending protruding in both directions from each branch part 427. It should be understood that the profile of the expansion part 425 illustrated in Figure 8 may include a profile wherein it is branched into the shapes of tree boughs.

In order to enhance the cooling effects, it may be available to spray water from the outside or input ices continuously or intermittently, by which a strong cooling effect can be obtained. In this case, it needs to effectively drain a lot of water which generates due to the condensation operation inside the system. Moreover, a dew condensation may occur at the inner fin 120 due to over cooling during the winter season. Since this dew condensation may cause a secondary loss in the system, it needs to quickly drain water. For the sake of such a water drainage, referring to Figure 1, the expansion parts 126 of a part 111a which position at the top among a plurality of the inner fins 120 may be connected with each other. The inner fin 120a wherein the expansion parts 125 are connected with each other, are connected to a region (A) wherein the angle (a) formed with respect to a vertical line segment is over 30° in the inner surface of the building body part 110. Since the expansion parts 126 of the inner fin 120a which positions in the ceiling region are connected with each other, dew condensation which occurs at the inner fin 120a can move along the side surface and subsequently can be drained, not falling downward. As mentioned above, the condensation is carried out all the time at the inner fin 120, and the condensate can fall downward inside the containment building 100. Important devices, which are necessary to operate the atomic power plant, for example, a nuclear reactor, a control device, an electric power supply cable, a measuring device, etc. are disposed dense just below the roof part 115 of the containment building. Any phenomenon wherein water falls downward into this area is not preferred since the safety, normal operation and safe operation of the device may be interrupted. For this reason, it is preferred that the fins installed at the roof part are connected with each other for the inclination of the wall of the containment building to be over 30° from the vertical state, whereby the concentrate can flow downward along the surfaces of the fins.

In the surface areas of all the inner fins 120, it is preferred that the surface area (based on the convection heat transfer area of the containment building 100) of the containment building 100 contacting with the inner gas is larger. Moreover, for the sake of a heat transfer enhancement and drainage, the inner fin and the outer fin may be super-hydrophilically surface-treated for the equilibrium contact angle of the surface of the inner fin 120 to be below 30° or may be super-hydrophobically surface-treated for the same to be over 160°. If water produces at the fin surfaces due to the condensation, the heat resistance may be in proportion to the thickness of water. For this reason, it is advantageous for the heat radiation that the thickness of water is made thinner, and the thickness of water is dependent on the contact angle of the fin surface. If the equilibrium contact angle (the angle between the 3-phase boundary surface between the solid-fluid-gas and the boundary surface between the solid-liquid and the liquid-gas) is smaller than 30°, water can be drained well. If the equilibrium contact angle is over 160°, water may transform into drops, so the water drops can roll down well, by means of which the condensation heat transfer, consequently, can be promoted. The super-hydrophilic treatment may lower the heat resistance by thinning a water membrane, and the superhydrophobic treatment may significantly increase a condensation heat transfer coefficient or may allow the condensate to be discharged easily. For this reason, the aforementioned treatments are effective. The portion where the concrete part 119, the air and the inner fin 120 meet each other is waterproofed.

The inner fin 120 may be coupled to the fin support rod 117 with the aid of an inner fin connection structure 150. Referring to Figure 3, the inner fin connection structure 150 may include a connection part side male thread part 151 formed at an inner end portion of the fin support rod 117, a fin side male thread part 152 formed at the extension part 121 of the inner fin 120, an engaging bolt 153 which is engaged to the connection part side male thread part 151 and the fin side male thread part 152, and an auxiliary bolt 154 which is engaged to the fin side male thread part 152 and is contacting with the engaging bolt 153. An end portion of the engaging bolt 153 is disposed close to the inner liner 113. The auxiliary bolt 154 is able to reinforce the coupling strength of the inner fin 120.

Referring to Figures 1 and 2, a plurality of the outer fins 130 are engaged to the outer surface of the building body part 110. The outer fin 130 may include an extension part 131 which is protruding almost at a right angle with respect to the outer surface of the building body part 110, and an expansion part 135 which is formed expanded from an end portion of the extension part 131 and almost at a right angle with respect to the extension part 131. Since the profile of the expansion part 135 is same as each of the expansion parts 125, 225, 325 and 425 of the inner fin 120 which has been described in conjunction with Figures 5 to 8, the detailed descriptions thereon will be omitted. The outer fin 130 in this embodiment is made of a steel or aluminum material.

In the area surfaces of all the outer fins 130, it is preferred that the surface area (based on the convection heat transfer area of the containment building 100) of the containment building 100 contacting with external air is larger. Moreover, for the sake of a heat transfer enhancement and drainage, the inner fin and the outer fin may be super-hydrophilically surface-treated for the equilibrium contact angle of the surface of the outer fin 130 to be below 30° or may be super-hydrophobically surface-treated for the same to be over 160°. Moreover, The portion where the concrete part 119, the air and the inner fin 120 meet each other is waterproofed. The surfaces of the outer fins 130 may be coated with a paint the surface emissivity of which is below 0.2, so it can be possible to prevent a radiant heat from inputting from the outside into the inside of the containment building 100. The outer fins 130 may radiate heat based on a convection heat transfer, but may absorb heat based on a radiant heat transfer. The heat radiation may increase as the surface temperature of the fin increases. The surface temperature should be maintained lower than the saturation temperature of the containment building, whereas the heat absorption by the radiant heat transfer may increase due to the surface emissivity of the fin. If wind is less, such operations may be carried out based on the natural convection, and the convection heat transfer coefficient may decrease to 5W/m2.KR. In a region where the radiant heat is strong like in the desert located on the equator, the vertical radiant heat incident onto the fins may be close to 13,600W/m2 which is the solar constant. In this case, it needs to use a predetermined material or a paint the emissivity of which is low, should be coated or the surface should be treated. The minimum values of the emissivity may be different based on an external temperature condition in an installation region of the atomic power plant, but the limit value of the emissivity under the desert condition may be below 0.2.

The outer fin 130 may be coupled to the fin support rod 117 with the aid of the external fin connection structure 160. Referring to Figure 4, the external fin connection structure 160 may include a connection part side male thread part 161 formed at an outer end portion of the fin support rod 117, a fin side male thread part 162 formed at the extension part 131 of the outer fin 130, an engaging bolt 163 engaged to the connection side male thread part 161 and the fin side male thread part 162, and an auxiliary bolt 164 which is engaged to the fin side male thread part 162 and is contacting with the engaging bolt 163. The engaging bolt 163 is disposed close to the outer surface of the building body part 110. The auxiliary bolt 164 is able to enhance the engaging strength of the outer fin 130.

Figure 9 is an enlarged cross sectional view illustrating a state where the inner fin and the outer fin are coupled to the building body part in Figure 1 according to another embodiment of the present invention. Referring to Figure 9, the inner fin 120 and the outer fin 130 are connected by a welding or adhering method to both ends of the fin support rod 217 which is disposed passing through the building body part 110 and the inner liner 113. It is preferred that the portions between the fin support rod 217 and the inner liner 113 are welded or adhered. The fin support rod 217 may be connected with the steel reinforcement 118 and subsequently may be connected to neighboring another fin support rod, by which the heat radiation effect can be enhanced.

Figure 10 is an enlarged cross sectional view illustrating a state where the inner fin and the outer fin are engaged to the building body part in Figure 1 according to further another embodiment of the present invention. Referring to Figure 10, the inner side fin support rod 317a to which the inner fin 120 is engaged, and the outer side fin support rod 317b to which the outer fin 130 is engaged, are provided as another example of the fin connection part. The inner side fin support rod 317a is embedded at the inner side of the building body part 110 and is connected to the steel reinforcement 118, and the inner fin 120 may be connected to an end portion which is protruding exposed into the inside of the building body part 110. The outer side fin support rod 317b is embedded at the outer side of the building body part 110 and is connected to the steel reinforcement 118, and the outer fin 130 may be connected to an end portion which is protruding exposed into the outside of the building body part 110.

Figure 11 is a cross sectional view illustrating a state where a cooling water is being supplied in the structure in Figure 9 according to further another embodiment of the present invention. Referring to Figure 11, the inner fin 120 and the outer fin 130 are connected to both ends of the fin support rod 417 which is disposed passing through the metallic inner liner 113 which is installed at the inner surface of the building body part 110. A nozzle 419 through which water is sprayed, may be installed at the outer fin 130. The fin support rod 417 may be connected to the steel reinforcement 118 and subsequently may be connected to neighboring another fin support rod. A cooling flow path 418 through which a cooling water flows, may be provided inside of the fin support rod 417. A mouth 418a of the cooling flow path 418 may be formed at an outer portion of the building body part 110. A cooling water can flow in via the mouth 418a with the aid of a cooling water supply system (not illustrated) provided outside the system. The cooling water supply system (not illustrated) is provided to supply the cooling water to all the fin support rods 417. An outlet 418b of the cooling flow path 418 may be connected to the nozzle 419, so the cooling water can be discharged via the nozzle 419. The cooling flow path 418 may extend long to pass through all the sections in the longitudinal direction and of the fin support rod 417. The cooling water which has flown into the mouth 418a may absorb heat from the fin support rod 417 while passing through the cooling flow path 418 and may be sprayed outside of the building body part 110 via the nozzle 419, thus evenly and effectively cooling the containment building.

While the inner fin 120 and the outer fin 130 have been described as being engaged to the steel reinforcement by means of the connection structures 150 and 160, but they may be connected by a welding or adhering method.

Figures 12 to 14 are views illustrating a containment building of an atomic power plant according to further another embodiment of the present invention. Referring to Figures 12 to 14, a containment building 500 of an atomic power plant according to further another embodiment of the present invention may include a building body part 110 which is configured to provide a predetermined closed space in the inside thereof, an inner liner 113 which is installed attached to the inner surface of the building body part 110 and is made of a metallic, an outer liner 114 which is installed attached to the outer surface of the building body part 110 and is made of a metallic material, a plurality of inner fins 520 which position inside of the building body part 110 and are made of metallic materials connected to the inner liner 113, and a plurality of outer fins 530 which position outside of the building body part 110 and are made of metallic materials connected to the outer liner 114.

Since the configuration of the building body part 110 and the inner liner 113 are almost same as the building body part 110 and the inner liner 113 described in conjunction with Figure 1, the detailed description thereon will be omitted.

The outer liner 114 may be made of a metallic material and may be installed attached to the outer surface of the building body part 110. The outer liner 113 may be connected with a plurality of outer fins 530. The radioactivity leakage prevention effect can be greatly enhanced with the aid of the outer liner 114.

The inner fin 520 may be installed inside of the building body part 110 and may be connected with the inner liner 113. The inner fin 520 may include an extension part 521 which is protruding at a right angle with respect to the inner surface of the building body part 110, and an expansion part 525 which is expanding almost at a right angle with respect to the extension part 521 at an end portion of the extension part 521. Since the detailed configuration thereof is almost same as the previously described inner fin, the detailed description thereon will be omitted. The expansion parts 525 of the inner fins 520 arranged in a circumference direction (a circumferential direction) at a plurality of the inner fins 520 may be connected as illustrated in Figure 14. In case of the concrete which may constitute most of the building body part 110, the tensile strength is 2 to 5MPa, and the compression strength is 20 to 40MPa, which represents that the concrete is very weak to the tension. In case of the steel, the tensile strength is 41MPa, and the compression strength is 28MPa, which represents that the steel is relatively stronger against the tension. Given the characteristics of the concrete and the steel, as illustrated in Figure 14, if the expansion parts 525 are connected along the circumferential direction, the pressure resisting quality of the containment building can be enhanced. The configuration wherein the inner fins 520 are engaged to the fin support rods 217 provided inside of the building body part 110, may be implemented using the previously described connection structure 150 or a welding method, etc., so the detailed descriptions thereon will be omitted. A plurality of the outer fins 530 are coupled to the outer surface of the building body part 110. The outer fin 530 may include an extension part 131 which is protruding almost at a right angle with respect to the outer surface of the building body part 110, and an expansion part 135 which is expanding almost at a right angle with respect to the extension part 131 at an end portion of the extension part 131. Since the detail configuration is almost same as that of the previously described outer fin, the detailed description thereon will be omitted. As illustrated in Figure 14, the expansion parts 535 of the outer fins 530 arranged in a circumference direction (a circumferential direction) at a plurality of the outer fins 530 are connected, thus enhancing a pressure resisting property of the containment building. Since the configuration wherein the outer fins 530 are coupled to the fin support rod 217 provided inside of the building body part 110 may be implemented using the previously described connection structure 160 or a welding method, etc., the detailed description thereon will be omitted.

In this embodiment, the surface area which the expansion part 535 of the outer fin 530 occupies, may be wider than the surface area which the expansion part 525 of the inner fin 520 occupies. A condensation heat transfer of air-vapor may occur at the inner wall of the containment building, and the heat transfer coefficient (hi) in the inside thereof, basically, may be about 50 to 300W/m2K due to a phase change heat transfer, whereas a mixed convection heat transfer may occur at the outer wall of the containment building due to a natural convection of air and an external wind. The natural convection heat transfer coefficient (h0) in an outside environment is about 5 to 10W/m2K, and even given the mixed convection due to wind, it is about 10 to 20W/m2K. Given this maters, a more effective natural heat radiation can be obtained if the surface area of the outer fin 530 is larger.

In the above embodiment, while the building body part has been described as being a reinforced concrete structure, it may be formed of a steel.

As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described examples are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims

WHAT IS CLAIMED IS:

1. A containment building structure for an atomic power plant, comprising: a building body part which is formed of a side wall part and a roof part; a plurality of inner fins which are installed inside of the building body part, wherein the inner fins are made of metallic materials; a plurality of outer fins which are installed outside of the building body part, wherein the outer fins are made of metallic materials; and a fin connection part which is configured to connect the inner fins and the outer fins, wherein the fin connection part is made of a metallic material.

2. The structure of claim 1, further comprising: an inner liner which is installed at the inner surface of the building body part, wherein the inner liner is made of a metallic material.

3. The structure of either claim 1 or claim 2, further comprising: an outer liner which is installed at the outer surface of the building body part, wherein the outer liner is made of a metallic material.

4. The structure of claim 1, wherein the building body part is configured in a reinforced concrete structure, and the fin connection part is a steel reinforcement of the building body part.

5. The structure of claim 1, wherein the fin connection part comprises a fin support rod which is installed passing through the building body part, wherein both ends of the fin support rod are connected to the inner fin and the outer fin, respectively.

6. The structure of claim 5, wherein a cooling flow path is formed inside of the fin support rod, wherein an externally supplied cooling water can flow through the cooling path.

7. The structure of claim 6, wherein a spray nozzle is provided at an outer side if the containment building and is connected to an exit of the cooling flow path.

8. The structure of claim 1, wherein the building body part is configured in a reinforced concrete structure, and the fin connection part includes an inner side fin support rod which is connected with the inner fin and is installed embedded in the inside of the building body part and is connected to a steel reinforcement of the building body part, and an outer side fin support rod which is connected with the outer fin and is installed embedded in the outside of the building body part and is connected to a steel reinforcement of the building body part.

9. The structure of claim 1, further comprising: a fin connection structure which is able to connect the inner fin and the outer fin to the fin connection part.

10. The structure of claim 9, wherein the fin connection structure comprises a connection part side male thread part formed at the fin connection part, a fin side male thread part formed at the fin, and an engaging bolt which is engaged to both the connection part side male thread part and the fin side male thread part.

11. The structure of claim 10, wherein the fin connection structure further comprises an auxiliary bolt which is engaged to the fin side male thread part and is contacting with the engaging bolt.

12. The structure of claim 1, wherein the inner fin or the outer fin is connected with the fin connection part by a welding or adhering method.

13. The structure of claim 1, wherein the inner fin or the outer fin comprises an extension part which is extending protruding from the inner surface or the outer surface of the building body part, and an expansion part which is expanding at a predetermined angle with respect to the extension part.

14. The structure of claim 13, wherein the expansion part comprises a central part which is connected to the extension part, and a branch part which is extending in a radial shape from the central part.

15. The structure of claim 13, wherein the expansion part comprises a first bar part which is connected with the extension part and is extending rectilinearly, and a plurality of second bar parts which are connected to the first bar part.

16. The structure of claim 15, wherein the first bar part is extending in a horizontal direction, and a plurality of the second bar parts are branched in a tree bough shape at a predetermined angle with respect to the first bar part.

17. The structure of claim 15, wherein the extension part positions at a central part of the first bar part, and the lengths of a plurality of the second bar parts are gradually getting shorter as they are getting farther from the center of the first bar part.

18. The structure of claim 13, wherein the expansion parts of the inner fins engaged to a region where an angle formed with respect to a vertical line segment at the inner surface of the building body unit among a plurality of the inner fins is over 30°, are connected with each other.

19. The structure of claim 1, wherein the inner fin and the outer fin are super-hydrophilically surface-treated for the equilibrium contact angle of the surface thereof to be below 30° or are super-hydrophobically surface-treated for the same to be over 160°.

20. The structure of claim 1, wherein the surface of the outer fin is surface-treated using a paint the surface emissivity of which is below 0.2.

21. The structure of claim 1, wherein the inner fin and the outer fin are made of a steel or aluminum material.

22. The structure of claim 1, wherein the building body part is made of a steel material.

23. The structure of claim 1, wherein the surface area of the outer fin is larger than the surface area of the inner fin.

24. The structure of claim 1, wherein the inner fin comprises an extension part which is extending protruding from the inner surface of the building body part, and an expansion part which is expanding at a predetermined angle with respect to the extension part, and the expansion parts of a plurality of the inner fins are connected along a circumference direction of the building body part.

25. The structure of either claim 1 or claim 24, wherein the outer fin comprise an extension part which is extending protruding from the outer surface of the building body part, and an expansion part which is expanding at a predetermined angle with respect to the extension part, and the expansion parts of a plurality of the outer fins are connected along a circumference direction of the building body part.