JP6539105B2 - Reactor building - Google Patents

Description

  The present invention relates to a nuclear reactor building.

  The reactor building that houses the reactor containment vessel etc. will be constructed firmly using reinforced concrete etc. so that it can withstand natural disasters etc. Furthermore, in recent years, there is also a demand for further safety enhancement against collisions with aircraft and the like.

  There are known techniques for protecting the reactor even when the aircraft collides with the roof of the reactor building (Patent Documents 1 and 2). Moreover, the technique of partially thickening and reinforcing a concrete wall is also known for the ease of construction (patent documents 3, 4).

JP 2007-297854 A JP 2011-43439 A Unexamined-Japanese-Patent No. 06-299718 gazette JP, 2002-371653, A

  The prior art described in Patent Documents 1 and 2 is a technology mainly for strengthening the roof of a reactor building in preparation for an aircraft collision, but hardly takes into consideration the collision of the aircraft against the outer wall. The greater the inrush angle of the aircraft relative to the reactor building, the smaller the horizontal projected area of the building and the lower the probability of the aircraft colliding with the building.

  Therefore, in fact, it is necessary to prepare for an aircraft rush from the horizontal direction or slightly above the horizontal rather than an aircraft collision on the roof of a building. If the aircraft collides with the outer wall of the building, strong vibrations may be transmitted from the outer wall to the floor, and this vibration may also be transmitted to important equipment inside the building. Therefore, it is necessary to reduce the vibration transmitted from the outer wall to the floor as much as possible.

  Patent document 1 only provides a damping device between a roof and a building body, and does not sufficiently take into consideration the vibration transmitted from the outer wall to the floor when the aircraft collides with the wall of the building. Patent Document 2 discloses a technique for making a ceiling or a wall thick enough so that it will not be damaged even if an aircraft collides. If the outer wall is thick enough, the vibration transmitted from the outer wall to the floor can be reduced. However, as the thickness of the roof and the entire building body increases, the weight of the roof of the building increases, and the overturning moment of the building increases. Therefore, there is a risk that earthquake resistance may be reduced instead of increasing defense against aircraft collisions.

  The present invention has been made in view of the above problems, and its object is to suppress the increase in weight of the roof of the building and to reduce the vibration transmitted from the wall to the floor when an impact is applied to the wall. Providing a nuclear reactor building.

  In order to solve the above problems, a nuclear reactor building according to the present invention is a nuclear reactor building having a plurality of floors, and a floor of a predetermined area corresponding to a junction of a given floor among wall-floor junctions of each floor. And a reinforcing portion for making the strength of the floor greater than the strength of the floor other than the predetermined area.

  The reinforcing portion may be formed by making the thickness dimension of the floor of the predetermined area larger than the thickness dimension of the floor other than the predetermined area. The reinforcing portion may be formed by embedding the H-shaped steel in the floor of a predetermined area so that the web is parallel to the floor surface.

  According to the present invention, the reinforcement portion is provided not on the entire floor of the reactor building but on the predetermined floor to partially reinforce the floor of the predetermined area corresponding to the joint between the wall and the floor. Vibrations transmitted from the wall to the floor can be reduced while suppressing an increase in weight at the top. Therefore, according to the present invention, it is possible to achieve both of the improvement of the safety against the impact to the wall and the improvement of the earthquake resistance.

Longitudinal sectional view of a reactor building. Sectional drawing which expands and shows the connection part of an outer wall and a floor. The graph which shows the relationship between the mass increase of a floor, and the fall of the maximum acceleration transmitted from a wall to a floor. The expanded sectional view of the connection part of an outer wall and a floor concerning 2nd Example. (A) is explanatory drawing which shows that the reinforcement range of a floor changes with arrangement | positioning relationship between a reactor building and another building according to 3rd Example, (b) is a reactor building and another building, It is an explanatory view showing that a reinforcement range of a floor changes with height relation of a. (A) is a sectional view expanding and showing a connecting portion of an outer wall and an inner wall and a floor concerning a 4th example, and (b) shows an explanatory view showing a reinforcement range of a floor. (A) is sectional drawing which shows a mode that H-shaped steel is embedded only to the connection part of an outer wall and a floor concerning 5th Example, (b) is a connection part of an outer wall and a floor, and a connection part of an inner wall and a floor. It is sectional drawing which shows a mode that H-shaped steel is embedded to both. According to the sixth embodiment, in the area protected by another building, the joint between the inner wall and the floor is not reinforced, and in the area not protected by another building, the joint between the outer wall and the inner wall and the floor is reinforced It is explanatory drawing which shows a mode that it carries out.

  Hereinafter, embodiments of the present invention will be described based on the drawings. In the reactor building 1 of the present embodiment, the reinforcing portion 16 is provided in the vicinity of the joint portion J1 of the outer wall 12 of the predetermined ground floor and the floor 14. For example, by making the thickness t3 of the floor 14 in the vicinity of the joint portion J1 between the outer wall 12 and the floor 14 larger than the thickness t1 of the floor 14 inside the building, the reinforcing portion 16 is integrally provided on the floor 14. Thereby, it is possible to reduce the vibration transmitted from the outer wall to the floor when the aircraft collides with the outer wall 12 of the building while suppressing an increase in the mass of the roof of the building.

  It should be noted that instead of setting the thickness dimension t3 of the floor 14 of the predetermined region to be larger than the thickness dimension t1 of the other regions of the floor 14, the thickness dimension of the outer wall 12 of the joint portion J1 is made more than other portions. It can also be considered to be thicker by the dimension L1. Hereinafter, the present invention will be described in detail.

  The first embodiment will be described with reference to FIGS. 1 to 3. In the present embodiment, a building of a boiling water reactor is described as an example. The reactor building 1 is constructed using reinforced concrete or the like, and approximately half of the reactor building 1 is buried below the ground 2. The frame of the reactor building 1 is configured to include, for example, a foundation 11 made of reinforced concrete, an outer wall 12, an inner wall 13, a floor 14 of each floor, and a roof 15.

  At a substantially central portion of the reactor building 1, a reactor containment vessel 20 formed of reinforced concrete and a steel liner is provided. The reactor containment vessel 20 is an object to be protected from vibration when the aircraft collides with the wall 12 and corresponds to the “predetermined device”. The reactor containment vessel 20 accommodates a reactor pressure vessel 30, which is a substantially cylindrical structure made of, for example, steel. An annular suppression chamber (not shown) is provided on the bottom side of the reactor containment vessel 20.

  Of the entire building of the reactor building 1, a part of the height area Hug is buried underground, and a part of the height area Hag is exposed to the ground. In the present embodiment, the ground floor is a floor included in the height area Ha among the floors of the reactor building 1. The basement floor is a floor included in the height area Hug among the floors of the reactor building 1.

  Further, among the ground floors included in the area Hag, the floor included in the protection target area H1 in which the reactor containment vessel 20 is installed corresponds to the "predetermined floor". An area other than the protection target area H1 among the ground floors is the non-protection target area H2. The non-protection target area H2 is an area to which a ground floor to which a protection target device such as the reactor containment vessel 20 is not installed belongs, for example, in the vicinity of the roof 15. The non-protected area H2 does not mean that it is not protected from external impact, but is an area not protected by the reinforcing portion 16 described in this embodiment. The ground floor (including the roof 15) belonging to the unprotected area H2 is made of reinforced concrete or the like and is protected from impact and the like.

  Here, the protection target device as the “predetermined device” can include peripheral devices such as a cooling facility as well as the nuclear reactor containment vessel 20. Furthermore, the protected device may include spent nuclear fuel. In this case, the area to which the peripheral apparatus and the floor where the spent nuclear fuel is installed belongs is set as the protection target area H1.

  The protection target area H1 is limited to the ground portion. The underground part is not exposed and there is little need for protection. In an aircraft collision, the aircraft may collide with the outer wall 12 above the ground 2. The force acting on the outer wall 12 due to the collision of the aircraft is indicated by arrow F in the figure.

  Please refer to the enlarged view of FIG. In the present embodiment, the reinforcement portion 16 is integrally provided on the floor 14 by making the thickness of the floor 14 in the vicinity of the joint portion J1 between the ground outer wall 12 and the floor 14 thicker than the floor 14 inside. The floor inside means the floor located inside the building 1 rather than the vicinity of the joint portion J1 with the outer wall 12. It can also be called the inner floor.

  The thickness dimension t3 of the reinforcing portion 16 is set to be larger than the thickness dimension t1 of the floor 14 on the inner side thereof by a dimension t2. Therefore, the mechanical strength (for example, bending rigidity) in the vicinity of the joint portion J1 of the outer wall 12 and the floor 14 is reinforced by the thick reinforcing portion 16.

  According to this embodiment, since the reinforcing portion 16 is integrally formed in the vicinity of the joint portion J1 of the outer wall 12 and the floor 14, the bending rigidity of the outer wall 12 is increased. Therefore, even when the aircraft collides with the outer wall 12 and a strong impact force F is applied to the outer wall 12, deformation near the joint J1 can be suppressed. As a result, vibrations propagating from the outer wall 12 to the floor 14 can be reduced, devices to be protected (such as the reactor containment vessel 20) can be protected, and safety is improved.

  In the present embodiment, instead of providing the reinforcing portion 16 on the entire floor, the reinforcing portion 16 is provided only on a predetermined floor. Furthermore, in the present embodiment, the reinforcing portion 16 is provided by partially thickening the floor 14 only in the vicinity of the joint portion J1, instead of thickening the entire outer wall 12 or the floor 14 to increase the strength. ing. Therefore, in the present embodiment, it is possible to suppress an increase in the mass of the above-ground portion of the building 1, reduce vibration propagation from the outer wall 12 to the floor 14, and maintain earthquake resistance.

  FIG. 3 is a graph showing the result of confirming the effect of the present embodiment by numerical calculation by the finite element method. In the graph of FIG. 3, the case Gp of the conventional structure and the case Gi of the structure of the present embodiment are shown in comparison.

  Here, the conventional structure is a structure in which the thicknesses of the outer wall 12 and the floor 14 are uniformly increased as a countermeasure against the collision of the aircraft. The horizontal axis of FIG. 3 is an increase rate of the mass of the reactor building 1. The vertical axis in FIG. 3 is the ratio of the maximum values of acceleration on the floor 14 inside the reactor building 1. The ratio of the maximum acceleration is based on the maximum acceleration when the rate of increase in mass is zero, that is, when the aircraft collision countermeasure is not applied.

  From FIG. 3, when it is intended to reduce the maximum acceleration transmitted to the floor 14 by about 15%, the mass increases by about 13% in the conventional structure (Gp), while the increase in mass is 6% in the structure of this embodiment. It can be seen that it can be suppressed to (Gi). That is, as described above, by partially increasing the strength of the floor 14 in the predetermined area L1 only on the predetermined floor, the maximum acceleration can be reduced while suppressing the mass increase as compared with the conventional structure.

  The second embodiment will be described with reference to FIG. The following embodiments, including the present embodiment, correspond to modifications of the first embodiment, and therefore, differences from the first embodiment will be mainly described.

  In this embodiment, the thickness t3 of the floor 14 in the vicinity of the joint portion J1 between the outer wall 12 and the floor 14 is not only increased from the thickness t1 of the other portions, but the H-shaped steel in the floor 14 whose thickness is increased. Are buried.

  The H-shaped steels 18 are arranged parallel to each other, and are provided vertically between a pair of flanges 18A formed in a thick flat plate shape and each thick, and connecting between the flanges 18A An H-shaped cross section is formed from the web 18B.

  In this embodiment, the H-shaped steel 18 is embedded in the thick reinforced concrete reinforcement portion 16 so that the web 18 B is parallel to the floor 14.

  The present embodiment configured in this way also achieves the same effects as the first embodiment. Furthermore, in the present embodiment, after the thickness of the reinforced concrete floor 14 is increased, the mechanical strength of the outer wall 12 is increased compared to the first embodiment because the H-shaped steel 18 is disposed in a predetermined posture therein. It can be done.

  The third embodiment will be described with reference to FIG. In the present embodiment, the reinforcing portion 16 is not provided over the entire circumference of the reactor building 1, and the reinforcing portion 16 is not provided in a range protected by another building 3 existing in a predetermined range. In other words, in the present embodiment, the other building 3 is used as a kind of protective wall, and the reinforcing portion 16 is provided only in a range where it is difficult to obtain the protective effect by the other building 3.

  FIG. 5 (a) shows the arrangement of the reactor building 1 and the other buildings 3 on the plane. FIG. 5 (b) shows the height relationship of the arrangement of the reactor building 1 and other buildings 3. Other buildings include, for example, a turbine building. However, if it is a building which has not only a turbine building but fixed intensity and a size, and exists within predetermined range W from reactor building 1, it can be used as a protective wall.

  As shown in FIG. 5 (a), among the four planes of the reactor building 1, in the plane where the other buildings 3 do not exist (upper and lower and left sides in the figure), as shown by the hatched portion P1b, A reinforcement portion 16 is provided in a predetermined area of a predetermined ground floor.

  In the example of FIG. 5, in one of the four planes of the reactor building 1 (the right side in the figure), another building 3 is adjacent within a predetermined range W and separated by a distance A1. There is. On the other building 3 adjacent side, since the other building 3 can be used as a defense wall, the possibility that the aircraft directly collides with the outer wall 12 of the reactor building 1 is low. When the reactor building 1 is within the front projection area of another building 3, it is not necessary to provide the reinforcing portion 16 on a predetermined ground floor on the side facing the other building 3.

  However, if the height H3 of the other building 3 is lower than the top floor of the predetermined ground floors of the reactor building 1, or the width of the other building 3 is greater than the width dimension W1 of the reactor building 1 In the case where the dimension W2 is short, the reinforcing portion 16 can be provided in a range protruding from the front projection area of another building 3.

  That is, as shown by the hatched portion in FIG. 5B, it is a ground floor that accommodates the device to be protected (for example, the reactor containment vessel 20) and corresponds to the joint portion J1 between the outer wall 12 and the floor 14. A reinforcement portion 16 is provided in a region P1a which is a floor of a predetermined region (L1, W1) and which protrudes from the front projected area of another building 3.

  The present embodiment configured in this way also achieves the same effects as the first embodiment. Furthermore, in the present embodiment, the reinforcing portion 16 is not provided in the range in which other buildings 3 can be used as a protective wall, and the reinforcing portions 16 are provided only in a range in which the other buildings 3 can not be used as a protective wall. Therefore, the range in which the reinforcing portion 16 is provided can be made smaller, the increase in mass of the upper part of the reactor building 1 can be suppressed more than in the first embodiment, and the vibration propagating from the outer wall 12 to the floor 14 can be reduced. it can.

  The fourth embodiment will be described with reference to FIG. In this embodiment, the first reinforcing portion 16 is provided in the vicinity of the first joint portion J1 where the outer wall 12 and the floor 14 are joined, and the first reinforcement portion 16 is also provided near the second joint portion J2 where the inner wall 13 and the floor 14 are joined. 2 Provide a reinforcing portion 19.

  FIG. 6 (a) is an enlarged sectional view showing the connection between the outer wall 12 and the inner wall 13 and the floor 14. FIG. 6 (b) shows the outer wall 12, the inner wall 13, the floor 14, and the reinforcements 16 and 19. It is sectional drawing which shows a relationship.

  Here, the length L1 of the thick portion in the vicinity of the joint portion J1 between the outer wall 12 and the floor 14 (the depth L1 of the first reinforcing portion 16) and the vicinity of the second joint portion J2 between the inner wall 13 and the floor 14 The length L2 of the thick portion (the depth dimension L2 of the second reinforcing portion 19) may be set to the same value, or may be set to a different value. Since the impact force F from the outside is relieved by the outer wall 12, the dimension L2 of the second reinforcing portion 19 may be shorter than the dimension L1 of the first reinforcing portion 16 (L1> L2).

  The present embodiment configured in this way also achieves the same effects as the first embodiment. Furthermore, in the present embodiment, since the reinforcing portion 19 is provided also in the second joint portion J2 between the inner wall 13 and the floor 14, the bending rigidity of the inner wall 13 can be improved and the vibration transmitted from the inner wall 13 to the floor 14 can be reduced.

  The fifth embodiment will be described with reference to FIG. In this embodiment, the second embodiment and the fourth embodiment are combined.

  As shown in FIG. 7A, in the first reinforcing portion 16 provided in the vicinity of the joint portion J1 between the outer wall 12 and the floor 14, the web 18B is parallel to the floor 14 (in other words, The H-shaped steel 18 may be embedded such that the web 18 B is perpendicular to the outer wall 12).

  As shown in FIG. 7 (b), the web 18B is also parallel to the floor 14 in the second reinforcement 19 provided in the vicinity of the joint J2 between the inner wall 13 and the floor 14 (in other words, The H-shaped steel 18 may be embedded such that the web 18 B is perpendicular to the inner wall 13.

  The present embodiment configured in this way also exhibits the same effects as the first, second, and fourth embodiments.

  The sixth embodiment will be described with reference to FIG. In this embodiment, the third embodiment and the fourth embodiment are combined. The range P1 indicates the range in which the first reinforcing portion 16 for forming the mechanical strength of the outer wall 12 is formed. The range P2 indicates the range in which the second reinforcing portion 19 for forming the mechanical strength of the inner wall 13 is formed. The small letter "a" attached to the reference signs P1 and P2 indicates that the other building 3 can be used as a defensive wall. The small letter "b" similarly attached to the reference numerals P1 and P2 indicates that the other building 3 can not be used as a defense wall.

  In the present embodiment, on the side where the other adjacent building 3 can not be used as a protective wall, as shown by the hatched portions P1b and P2b, the reinforcing portions 16 and 19 are provided at the respective junctions of the outer wall 12 and the inner wall 13 and the floor 14. Is provided. On the other hand, in the ranges P1a and P2a where other buildings 3 can be used as a defense wall, reinforcing portions 16 and 19 are provided only in the range not protected by the other buildings 3.

  The present embodiment configured in this way also exhibits the same effects as the first, third, and fourth embodiments.

  The present invention is not limited to the above embodiments, but includes various modifications. For example, the above embodiments are described in detail to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Also, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. In addition, with respect to a part of the configuration of each embodiment, it is possible to add, delete, and replace other configurations.

  1: Reactor building, 2: Ground, 3: other building, 12: outer wall, 13: inner wall, 14: floor, 15: roof, 16: reinforcement (first reinforcement), 18: H-shaped steel, 18A: flange, 18B: web, 19: reinforcement (second reinforcement)

Claims (4)

A nuclear reactor building with multiple floors,
The reinforced portion for making the strength of the floor of a predetermined area corresponding to the joint portion of the predetermined floor among the joints between the wall and the floor of each floor higher than the strength of the floor other than the predetermined area,
The reinforcing portion embeds the H-section steel in the floor of the predetermined area such that the web is parallel to the floor surface, thereby making the thickness dimension of the floor of the predetermined area the floor other than the predetermined area Formed by making it larger than the thickness dimension of the
Reactor building. The predetermined floor is a ground floor among the plurality of floors, and is a floor on which a predetermined device is installed.
The reactor building according to claim 1 . The predetermined floor is a floor which is a ground floor of the plurality of floors and which is out of a front projection area of a building existing within a predetermined range.
The reactor building according to claim 1 . The predetermined floor is a floor which is a ground floor among the plurality of floors and on which the predetermined device is installed and which is a floor which is out of a front projection area of a building existing within a predetermined range.
The reactor building according to claim 1 .

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