JP5448470B2 - Concrete reactor containment vessel, construction method and modification method for concrete reactor containment vessel - Google Patents

Description

  The present invention relates to a concrete reactor containment vessel in which a nuclear reactor can be stored, a method for constructing a concrete reactor containment vessel, and a modification method.

  Conventionally, as a concrete reactor containment vessel, a prestressed concrete reactor containment composed of a cylindrical concrete wall disposed in the lower part and a dome-shaped concrete wall disposed in the upper part of the foundation plate. Containers are known (see, for example, Patent Document 1).

  Moreover, although it is not a concrete reactor containment vessel, in patent document 2, the steel reactor containment vessel is described as a reactor containment vessel which stores a reactor inside (for example, refer patent document 2). .

JP 2000-147177 A Japanese Utility Model Publication No.59-17898

  By the way, in recent years, the seismic standards of nuclear power plants have become strict so that they can withstand a large earthquake. However, in the prestressed concrete reactor containment vessel constituted by the cylindrical concrete wall body of Patent Document 1, the cylindrical concrete wall body has a high center of gravity, so that the cylindrical concrete wall body easily swings from side to side. For this reason, when a large earthquake is encountered, the cylindrical concrete wall body swings left and right, so that a part of the cylindrical concrete wall body is compressed and a part thereof is expanded. At this time, due to the properties of the concrete, the extending cylindrical concrete wall is easily cracked. If a cylindrical concrete wall cracks, the reactor containment vessel changes its seismic response performance, which is disadvantageous for structural evaluation. For this reason, it is necessary to improve the earthquake resistance of the reactor containment vessel.

  Patent Document 2 describes a steel reactor containment vessel, and a concrete outer vessel covering the steel reactor containment vessel is disposed on the outside thereof. A part of the outer wall surface of the concrete outer peripheral container is formed in a tapered shape. However, the concrete outer container is not configured as a reactor containment vessel that houses the reactor inside. Specifically, the concrete outer peripheral container has a configuration in which the connecting portion between the container body and the container ceiling is bent at the outer wall surface and the inner wall surface. For this reason, when the pressure inside the concrete outer peripheral container rises, the concrete outer peripheral container expands due to the pressure, stress due to the expansion concentrates on the bent portion, and the concrete outer peripheral container is easily cracked. From the above, the concrete outer vessel does not function as a reactor containment vessel, and the technical field is different from the reactor containment vessel.

  Then, this invention makes it a subject to provide the construction method of a concrete reactor containment vessel which can improve earthquake resistance, the concrete reactor containment vessel, and the remodeling method.

  The concrete reactor containment vessel of the present invention is formed in a container body provided on the base plate, a container ceiling provided on the container body, and the container body from the container body to the container ceiling. An internal space in which the nuclear reactor can be stored, and the vessel body is formed in a tapered shape whose outer wall surface tapers over the entire length from the base plate side to the vessel ceiling side. Features.

  In this case, it is preferable that the internal space is formed so that a connection portion between the inner wall surface of the container body portion and the inner wall surface of the container ceiling portion is flush.

  In this case, it is preferable that the connection portion between the outer wall surface of the container body and the outer wall surface of the container ceiling portion is formed to be flush with each other.

  In this case, the container body further includes a container leg provided between the base plate and the container body, the container body is formed in a cylindrical body whose outer wall surface is tapered, and the container ceiling is formed on the outer wall surface thereof. Is formed in a hemispherical shape, and the container leg is preferably formed in a cylindrical body whose outer wall surface is straight.

  The method for constructing a concrete reactor containment vessel according to the present invention includes a container body provided on a foundation plate, a container ceiling provided on the container body, and the container body from the container body to the container ceiling. In a method for constructing a concrete reactor containment vessel, which is formed inside and has an internal space in which a nuclear reactor can be stored, an outer wall surface is formed on the foundation plate from the foundation plate side. A container body portion disposing step of disposing a tapered container body portion that tapers over the entire length to the container ceiling portion side, and a container ceiling portion disposing step of disposing the container ceiling portion on the container body portion And.

  The method for remodeling a concrete reactor containment vessel according to the present invention includes a container body provided on a base plate, a container ceiling provided on the container body, and extending from the container body to the container ceiling. In the construction method of a concrete reactor containment vessel that reinforces an existing concrete reactor containment vessel that is formed inside and can store the reactor, the outer wall surface of the vessel body is on the base plate side And a taper forming step of increasing the thickness of the wall surface of the container body portion toward the outer wall surface side so as to be a tapered shape over the entire length from the container to the container ceiling side.

  In this case, the existing concrete reactor containment vessel is further provided with a container leg provided between the foundation plate and the container body, and the outer diameter of the container leg is on the foundation plate side of the container body. It is preferable to further include a thickness forming step of increasing the thickness of the wall surface of the container leg portion toward the outer wall surface side so as to be equal to or larger than the outer diameter of the end surface.

  According to the concrete reactor containment vessel of claim 1 and the concrete reactor containment vessel construction method of claim 5, the taper that tapers the vessel body over the entire length from the base plate side to the vessel ceiling side. By adopting the shape, the center of gravity of the container body can be positioned closer to the base plate than in the conventional case, and the lower part of the container body to which a large amount of load can be applied can have a strong structure. As a result, the concrete reactor containment vessel is less likely to swing from side to side, so the concrete reactor containment vessel is difficult to compress and expand, and even if a large earthquake occurs, the concrete reactor containment vessel will crack. This can be suppressed. Therefore, the earthquake resistance of the concrete reactor containment vessel can be improved.

  According to the concrete reactor containment vessel of the second aspect, the inner wall surface of the concrete reactor containment vessel can be made flush. In other words, since the inner wall surface of the concrete reactor containment vessel is smooth and smooth, even if the internal pressure of the vessel is increased, the stress due to the internal pressure is suitably applied to the inner wall surface of the concrete reactor containment vessel. Can be dispersed. Thereby, it can suppress that a crack enters into a concrete reactor containment vessel.

  According to the concrete reactor containment vessel of the third aspect, the outer wall surface of the concrete reactor containment vessel can be made flush. That is, since the outer wall surface of the concrete reactor containment vessel is smooth without any irregularities, it is possible to suppress the formation of traces of rainwater flow and to prevent the outer wall surface from being soiled.

  According to the concrete reactor containment vessel of the fourth aspect, the vessel leg portion (lower portion of the concrete reactor containment vessel) can be formed with high accuracy by making the vessel leg portion a straight cylindrical body. As a result, the tapered shape of the container body provided on the container leg can be formed with high accuracy. Moreover, the container leg part to which many load is added can be made into a firm structure.

  According to the method for remodeling a concrete reactor containment vessel according to the sixth aspect, the vessel trunk portion can be reinforced in a tapered shape with respect to the existing concrete reactor containment vessel. For this reason, the center of gravity of the container body can be positioned on the base plate side as compared with the prior art without changing the internal space. As a result, the concrete reactor containment vessel is less likely to swing from side to side, so the concrete reactor containment vessel is difficult to compress and expand, and even if a large earthquake occurs, the concrete reactor containment vessel will crack. This can be suppressed. Therefore, it can be modified to a concrete reactor containment vessel with high earthquake resistance. In this case, the outer diameter of the container ceiling side end surface of the modified container body can be the same as the outer diameter of the container ceiling side end surface of the container body before modification.

  According to the method for remodeling a concrete reactor containment vessel according to claim 7, the thickness of the wall surface of the container leg portion is increased toward the outer wall surface side so as to be equal to or larger than the outer diameter of the end surface on the base plate side of the container body portion. Can do. For this reason, a container leg part can be reinforced with reinforcement of a container trunk | drum, and the low center of gravity of the existing concrete reactor containment vessel can be achieved.

FIG. 1 is a schematic configuration diagram illustrating a nuclear power plant according to the present embodiment. FIG. 2 is a vertical sectional view of the reactor containment vessel according to the present embodiment. FIG. 3 is a cross-sectional view in the horizontal direction of the reactor containment vessel according to the present embodiment. FIG. 4 is a layout diagram of a plurality of inverted U tendons disposed in the reactor containment vessel according to the present embodiment.

  Hereinafter, a nuclear power plant to which a concrete reactor containment vessel according to the present invention is applied will be described with reference to the accompanying drawings. The present invention is not limited to the following examples. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  In the nuclear power plant according to the present embodiment, a pressurized water reactor is used as a nuclear reactor. A pressurized water nuclear power plant heats light water as a primary coolant in a nuclear reactor, and then sends the light water at a high temperature to a steam generator by a pump. Then, the nuclear power plant evaporates the secondary coolant by exchanging heat with the secondary coolant in the steam generator, and sends the evaporated secondary coolant (steam) to the turbine. Power is generated by driving the generator.

  Here, FIG. 1 is a schematic configuration diagram illustrating the nuclear power plant according to the present embodiment, and FIG. 2 is a cross-sectional view in the vertical direction of the reactor containment vessel according to the present embodiment. 3 is a cross-sectional view in the horizontal direction of the reactor containment vessel according to the present embodiment, and FIG. 4 is a layout view of a plurality of inverted U tendons disposed in the reactor containment vessel according to the present embodiment. It is. Hereinafter, the configuration of the nuclear power plant will be briefly described with reference to FIG.

  As shown in FIG. 1, the nuclear power plant 1 includes a nuclear reactor 5 and a steam generator 7 connected to the nuclear reactor 5 through a pair of coolant pipes 6a and 6b including a cold leg 6a and a hot leg 6b. doing. In addition, a pressurizer 8 is interposed in the hot leg 6b of the pair of coolant pipes 6a and 6b, and a coolant pump 9 is interposed in the cold leg 6a. The reactor 5, the pair of coolant pipes 6a and 6b, the steam generator 7, the pressurizer 8 and the coolant pump 9 constitute the primary cooling system 3 of the nuclear power plant 1, and these contain the reactor containment vessel. 10.

  In the above configuration, the light water as the primary coolant flows into the steam generator 7 from the nuclear reactor 5 through the hot leg 6b, and then the light water flowing out through the steam generator 7 passes through the cold leg 6a. And flows into the reactor 5. That is, light water circulates between the nuclear reactor 5 and the steam generator 7 and is used as a coolant and a neutron moderator.

  The nuclear reactor 5 is a pressurized water reactor as described above, and the inside thereof is filled with light water. In the nuclear reactor 5, a large number of fuel assemblies 15 are accommodated, and a large number of control rods 16 for controlling the nuclear fission of the fuel assemblies 15 are provided so as to be insertable into the respective fuel assemblies 15.

  When the fuel assembly 15 is fissioned while controlling the fission reaction by the control rod 16, thermal energy is generated by the fission. The generated thermal energy heats light water, and the heated light water is sent to the steam generator 7 via the hot leg 6b. On the other hand, the light water sent from the steam generator 7 via the cold leg 6 a flows into the nuclear reactor 5 and cools the nuclear reactor 5.

  The pressurizer 8 interposed in the hot leg 6b suppresses boiling of light water by pressurizing light water that has become high temperature. Moreover, the steam generator 7 heat-exchanges the light water which became high temperature / high pressure with the secondary coolant, evaporates the secondary coolant, generates steam, and cools the light water which became high temperature / high pressure. doing. The coolant pump 9 circulates light water in the primary cooling system 3, sends light water from the steam generator 7 to the reactor 5 through the cold leg 6 a, and generates light water from the reactor 5 through the hot leg 6 b to generate steam. It is sent to the vessel 7.

  Here, a series of operations in the primary cooling system 3 of the nuclear power plant 1 will be described. When the light water is heated by the thermal energy generated by the fission reaction in the nuclear reactor 5, the heated light water is sent to the steam generator 7 by the coolant pump 9 via the hot leg 6b. The hot light water passing through the hot leg 6b is pressurized by the pressurizer 8 to suppress boiling, and flows into the steam generator 7 in a state of high temperature and pressure. The high-temperature and high-pressure light water that has flowed into the steam generator 7 is cooled by exchanging heat with the secondary coolant, and the cooled light water is sent to the reactor 5 by the coolant pump 9 via the cold leg 6a. And the reactor 5 is cooled because the cooled light water flows into the reactor 5.

  The nuclear power plant 1 connects the turbine 22 connected to the steam generator 7 via the steam pipe 21, the condenser 23 connected to the turbine 22, and the condenser 23 and the steam generator 7. And a water supply pump 24 interposed in the return water supply pipe 26, and the secondary cooling system 20 is configured by these. The secondary coolant circulating in the secondary cooling system 20 evaporates in the steam generator 7 to become a gas (steam) and is returned from the gas to the liquid in the condenser 23. A generator 25 is connected to the turbine 22 described above.

  When steam flows from the steam generator 7 into the turbine 22 through the steam pipe 21, the turbine 22 rotates. When the turbine 22 rotates, the generator 25 connected to the turbine 22 generates power. Thereafter, the steam flowing out from the turbine 22 flows into the condenser 23. The condenser 23 has a cooling pipe 27 disposed therein, and one of the cooling pipes 27 is connected to a water intake pipe 28 for supplying cooling water (for example, seawater). A drain pipe 29 for draining the cooling water is connected to. The condenser 23 cools the steam flowing in from the turbine 22 by the cooling pipe 27, thereby returning the steam to a liquid. The secondary coolant that has become liquid is sent to the steam generator 7 through the feed water pipe 26 by the feed water pump 24. The secondary coolant sent to the steam generator 7 becomes steam again by exchanging heat with the primary coolant in the steam generator 7.

  By the way, in such a nuclear power plant 1, a predetermined earthquake resistance standard is provided in order to ensure safety, assuming an earthquake or the like. In the present embodiment, the earthquake resistance of the reactor containment vessel 10 is improved in order to easily cope with the new earthquake resistance standards. Hereinafter, the reactor containment vessel 10 according to the present embodiment will be described with reference to FIG.

  The reactor containment vessel 10 is a so-called prestressed concrete reactor containment vessel, and is installed in the center of a concrete foundation plate 40. The reactor containment vessel 10 includes a container leg 41 installed on the base plate 40, a container trunk 42 installed on the container leg 41, and a container ceiling installed on the container trunk 42. 43 is integrally formed. The reactor containment vessel 10 incorporates a tendon mechanism 44 that constantly applies a compressive force against the pressure inside the vessel.

  The container leg 41 is formed in a cylindrical shape on the base plate 40. In other words, the outer diameter of the base plate side end surface and the outer diameter of the container body side end surface of the container leg 41 are the same, and the inner diameter of the base plate side end surface and the inner diameter of the container body side end surface are the same. It has a diameter and is formed straight from the base plate 40 side toward the container body 42 side. As a result, the container leg 41 has a hollow cylindrical container leg side internal space V1 formed therein, and the wall thickness between the inner wall surface and the outer wall surface extends in the axial direction (vertical direction) and the like. Constructed in thickness. At this time, the wall thickness between the inner wall surface and the outer wall surface in the container leg portion 41 is, for example, about 2.0 m.

  The container body 42 is formed in a tapered shape whose outer wall surface tapers from the container leg 41 side toward the container ceiling 43 side. That is, the outer diameter of the container leg part side end surface of the container body part 42 is larger than the outer diameter of the container ceiling part side end face, and from the container leg part 41 side toward the container ceiling part 43 side. The outer diameter is reduced. Further, the container body 42 has a hollow cylindrical container body side internal space V2 formed therein, and the inner diameter of the end face on the base plate side and the inner diameter of the end face on the container body side are the same diameter. ing. At this time, the outer diameter and the inner diameter of the base plate side end surface of the container body 42 are the same as the outer diameter and the inner diameter of the container leg 41. Thereby, the wall thickness between the inner wall surface and the outer wall surface of the container body portion 42 is the thickest on the container leg portion 41 side, and the wall thickness becomes thinner toward the container ceiling portion 43 side. Specifically, the wall thickness at the container ceiling part 43 side end surface of the container body part 42 is, for example, around 1.3 m, and the wall thickness at the container leg part 41 side end surface of the container body part 42 is, for example, 2 It is around 0.0m. Note that the overall length of the container body 42 in the axial direction is longer than the overall length of the container leg 41 in the axial direction.

  The container ceiling part 43 is formed in a hemispherical shape, a hollow hemispherical container ceiling part side internal space V3 is formed therein, and the opening of the container ceiling part 43 is formed in a circular cross section. . And the internal diameter of the container trunk | drum 41 side end surface (opening part) of the container ceiling part 43 is formed in the same diameter as the internal diameter of the container ceiling part side end surface of the container trunk | drum 42, and the outer diameter of the container trunk | drum 41 side end surface is The outer diameter of the container ceiling portion side end surface of the container body portion 42 is smaller. For this reason, the connection part of the container trunk | drum 42 and the container ceiling part 43 is formed so that the step part 48 may be formed in the outer wall surface, and it may become flush with the inner wall surface. At this time, the wall thickness between the inner wall surface and the outer wall surface in the container ceiling portion 43 is, for example, about 1.1 m, and is formed so that the total wall thickness is equal.

  The internal space V of the nuclear reactor containment vessel 10 in which the nuclear reactor 5 is stored is constituted by a container leg side internal space V1, a container trunk side internal space V2, and a container ceiling side internal space V3. In addition, in the step part 48 formed on the outer wall surface between the container body 42 and the container ceiling part 43, the connection portion between the outer wall surface of the container body 42 and the outer wall surface of the container ceiling part 43 is flush. For this purpose, an outer wall complementary portion 49 is formed. The outer wall complementary portion 49 is formed by placing concrete on the stepped portion 48. Moreover, although illustration is abbreviate | omitted, the lining is arrange | positioned in the inner wall surface of the reactor containment vessel 10, and the lining is formed by connecting several steel plates.

  Therefore, the reactor containment vessel 10 is configured to have a smooth wall surface with no irregularities. Thereby, even if a pressure rises inside the reactor containment vessel 10, the stress due to the expansion of the reactor containment vessel 10 does not concentrate on a part. For this reason, the reactor containment vessel 10 can be configured to withstand an increase in internal pressure. Further, in the reactor containment vessel 10, the connection portion between the outer wall surface of the vessel ceiling portion 43 and the outer wall surface of the vessel body portion 42 can be a smooth wall surface without unevenness. Thereby, formation of the run-down trace by rainwater can be suppressed, and the dirt of an outer wall surface can be prevented.

  Next, the tendon mechanism 44 will be described with reference to FIGS. 3 and 4. The tendon mechanism 44 includes a plurality of hoop tendons 50 wound in the circumferential direction inside the wall of the reactor containment vessel 10 and a plurality of inverted U tendons 51 wound in the axial direction inside the wall of the reactor containment vessel 10. And a plurality of (for example, two in this embodiment) buttress portions 52 for fixing a plurality of hoop tendons 50 and a tendon gallery portion 53 for fixing a plurality of inverted U tendons 51.

  As shown in FIG. 3, each hoop tendon 50 is formed of a so-called PC steel wire or PC steel wire, and is inserted into a sheath tube previously embedded in the wall of the reactor containment vessel 10 along the circumferential direction. Has been. The plurality of hoop tendons 50 are disposed in the axial direction in the vessel leg portion 41 and the vessel body portion 42 of the reactor containment vessel 10. At this time, of the plurality of hoop tendons 50, both ends of one set of hoop tendons 50 are fixed to one buttress portion 52, and both ends of another set of hoop tendons 50 are fixed to the other buttress portion 52. Are arranged in a large number.

  As shown in FIGS. 2 and 3, the two buttress portions 52 are respectively disposed at positions facing the outer wall surface of the reactor containment vessel 180 by 180 °. Each buttress portion 52 is formed in a rectangular shape extending in the axial direction, and is disposed along the outer wall surface of the reactor containment vessel 10 from the base plate 40 to the vessel ceiling portion 43. And each buttress part 52 latches the both ends of each hoop tendon 50.

  As shown in FIG. 2, each inverted U tendon 51 is made of a PC steel wire or a PC steel wire in the same manner as each hoop tendon 50, and is previously axially provided inside the wall of the reactor containment vessel 10. It is inserted through a sheath tube embedded along the line. As shown in FIG. 4, the plurality of inverted U tendons 51 are arranged so as to cross like a mesh when viewed from the upper surface of the reactor containment vessel 10. In other words, among the plurality of reverse U tendons 51, some of the reverse U tendons 51 are arranged from the front side (the lower side in the drawing) toward the rear side (the upper side in the drawing), and other reverse U tendons are provided. The tendon 51 is disposed from the right side surface (the right side in the drawing) toward the left side surface (the left side in the drawing). As shown in FIG. 2, one end of each inverted U tendon 51 is fixed to the tendon gallery 53 and the other end is fixed to the facing side of the tendon gallery 53. That is, each inverted U tendon 51 passes from the container leg 41 through the container body 42 to the container ceiling 43, and from the container ceiling 43 to the container body 42 through the container body 42. It is arranged.

  As shown in FIG. 2, the tendon gallery portion 53 is disposed immediately below the wall of the reactor containment vessel 10 and is annularly disposed along the wall of the reactor containment vessel 10. The tendon gallery 53 locks one end of each reverse U tendon 51, and on the opposite side of one end of each reverse U tendon 51 across the center of the reactor containment vessel 10, The other end of the tendon 51 is locked.

  Therefore, the tendon mechanism 44 can contract the wall of the reactor containment vessel 10 in the vertical and horizontal directions. For this reason, even if the pressure inside the reactor containment vessel 10 rises and the reactor containment vessel 10 tries to expand, the tendon mechanism 44 can resist the expansion. It can be set as the structure which can endure a fluctuation | variation.

  Next, although illustration is omitted, a construction method for constructing the reactor containment vessel 10 will be described. Note that the description of the construction related to the tendon mechanism 44 is omitted, and only the construction related to the reactor containment vessel 10 will be described. When constructing the reactor containment vessel 10, first, on the foundation plate 40, a container leg 41 that is a straight cylindrical body is constructed by placing concrete. After that, a cylindrical container body 42 having a tapered outer wall surface is built on the container leg 41 by placing concrete (container body arrangement step). At this time, since the container leg 41 is a straight cylindrical body, it can be formed with high accuracy, and the container body 42 can be formed with high accuracy by forming the container leg 41 with high accuracy. it can. Finally, the hemispherical container ceiling part 43 constructed in advance is arranged on the container body part 42 (container ceiling part arranging step), and at the same time, the outer wall complementing part 49 is formed.

  On the other hand, although illustration is omitted, the reactor containment vessel 10 described above can be configured by modifying a concrete reactor containment vessel that has already been constructed. Specifically, as an existing reactor containment vessel, a conventional reactor containment comprised of a straight cylindrical vessel body and a hemispherical vessel ceiling disposed on the vessel body. There is a container. A method of remodeling such an existing reactor containment vessel to make the above-mentioned reactor containment vessel will be described.

  When remodeling the existing reactor containment vessel, first, the lower side of the existing vessel body portion built on the base plate 40 is formed as the vessel leg portion 41 of this embodiment. That is, by increasing the thickness of the wall surface on the lower side of the existing container body portion toward the outer wall surface side (thickness forming step) so that the outer diameter on the lower side of the existing container body portion is increased, This is part 41. Then, the upper part side of the existing container trunk | drum is formed as the container trunk | drum 42 of a present Example. That is, the thickness of the wall surface on the upper side of the existing container body so that the outer wall surface on the upper side of the existing container body has a tapered shape that tapers over the entire length from the base plate side to the container ceiling side. The container body 42 is formed by increasing the thickness toward the outer wall surface (taper forming step). At this time, the outer diameter of the container leg part side end surface of the container body part 42 is formed to be the same diameter as the outer diameter of the container body part side end face of the container leg part 41, and the modified container body part 42 is also formed. The outer diameter of the end surface on the container ceiling portion 43 side is formed to be the same diameter as the outer diameter of the end surface on the container ceiling portion 43 side of the container body before remodeling.

  According to the concrete reactor containment vessel 10 and the construction method therefor, since the vessel body portion 42 can be tapered, the center of gravity of the vessel body portion 42 is positioned toward the base plate 40 as compared with the conventional case. Can be made. As a result, the reactor containment vessel 10 is less likely to swing from side to side. Therefore, even if a large earthquake occurs, the reactor containment vessel 10 is difficult to compress and expand, and cracks are prevented from entering the reactor containment vessel 10. can do. Therefore, the reactor containment vessel 10 of the present embodiment can be made highly earthquake resistant.

  Moreover, since the base of the reactor containment vessel 10 can be formed with high accuracy by disposing the cylindrical vessel legs 41, the tapered shape of the vessel body 42 can also be formed with high accuracy. . In the reactor containment vessel 10 of the present embodiment, the vessel legs 41 that are straight cylindrical bodies are provided, but a configuration in which this is omitted may be used. That is, the reactor containment vessel 10 may be configured by the vessel body portion 42 and the vessel ceiling portion 43.

  Furthermore, according to the above-described method for remodeling the concrete reactor containment vessel 10, the upper portion of the container body can be remodeled into a tapered shape with respect to the existing concrete reactor containment vessel. For this reason, the center of gravity of the container body 42 can be positioned toward the base plate 40 as compared with the prior art, that is, the center of gravity can be lowered without changing the internal space. Therefore, the concrete reactor containment vessel 10 having high earthquake resistance can be modified. Moreover, since it is not necessary to change the outer diameter of the container ceiling part 43 side end surface of the container trunk | drum 42 before and after remodeling, it is not necessary to change the structure of the container ceiling part 43.

  As described above, the concrete reactor containment vessel according to the present invention, the construction method and the modification method of the concrete reactor containment vessel are useful when applied to a prestressed concrete reactor containment vessel, Suitable for improving earthquake resistance.

DESCRIPTION OF SYMBOLS 1 Nuclear power plant 5 Reactor 7 Steam generator 8 Pressurizer 9 Coolant pump 10 Reactor containment vessel 15 Fuel assembly 16 Control rod 22 Turbine 23 Condenser 24 Water supply pump 25 Generator 26 Condensation water pipe 40 Basic version 41 Container leg part 42 Container body part 43 Container ceiling part 44 Tendon mechanism 50 Hoop tendon 51 Reverse U tendon 52 Buttress part 53 Tendon gallery part V Internal space V1 Container leg side internal space V2 Container body side internal space V3 Container ceiling side Interior space

Claims (5)

A container body provided on the base plate;
A container ceiling provided on the container body,
An internal space formed inside the vessel body from the vessel body to the vessel ceiling and capable of storing a nuclear reactor,
A container leg provided between the base plate and the container body ,
The container body is formed in a tapered cylindrical body whose outer wall surface tapers over the entire length from the base plate side to the container ceiling part side ,
The container ceiling is formed in a hemispherical outer wall surface,
A concrete reactor containment vessel characterized in that the container leg is formed in a cylindrical body whose outer wall surface is straight .   2. The concrete reactor according to claim 1, wherein the internal space is formed so that a connection portion between an inner wall surface of the container body and an inner wall surface of the container ceiling is flush. Containment vessel.   3. The concrete nuclear reactor containment vessel according to claim 1, wherein a connecting portion between the outer wall surface of the vessel body and the outer wall surface of the vessel ceiling portion is formed to be flush with each other. A container body provided on the base plate, a container ceiling provided on the container body, and formed inside the container body from the container body to the container ceiling so that the reactor can be stored. In the construction method of a concrete reactor containment vessel for constructing a concrete reactor containment vessel provided with an internal space, and a container leg provided between the foundation plate and the vessel trunk portion ,
A step of disposing the container legs to be a straight cylindrical body on the base plate;
A container body portion disposing step of disposing the container body portion of a tapered cylindrical body whose outer wall surface is tapered over the entire length from the base plate side to the container ceiling portion side on the container leg portion; ,
A method for constructing a concrete reactor containment vessel, comprising: a container ceiling portion disposing step of disposing the container ceiling portion having an outer wall surface that is hemispherical on the container body portion. A container body provided on the base plate, a container ceiling provided on the container body, and formed inside the container body from the container body to the container ceiling so that the reactor can be stored. In a method for remodeling a concrete reactor containment vessel that reinforces an existing concrete reactor containment vessel provided with an internal space, and a container leg provided between the foundation plate and the vessel body ,
The outer wall surface of the container body is thickened toward the outer wall surface so that the outer wall surface of the container body has a tapered shape that tapers over the entire length from the base plate side to the container ceiling portion side. Taper forming step ;
A thickness forming step of increasing the thickness of the wall surface of the container leg portion toward the outer wall surface so that the outer diameter of the container leg portion is equal to or greater than the outer diameter of the end face on the base plate side of the container body portion; A method for remodeling a concrete reactor containment vessel characterized by comprising:

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