JP2011053039A - Nuclear reactor building foundation structure of nuclear power plant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase percentage of building grounding of a nuclear reactor building without depending on enlargement of a planar dimension of a foundation of a nuclear reactor building of a nuclear power plant. <P>SOLUTION: The nuclear reactor building 5 includes: reactor containment vessel 1 having a nuclear reactor pressure vessel 3, a machine room 7 arranged around the reactor containment vessel 1, a nuclear reactor building foundation 2 supporting the reactor containment vessel 1 and the machine room 7. Two or more piles 6 are formed on a lower part of the nuclear reactor building foundation 2. The piles 6 are integrally formed with and dispersed in the nuclear reactor building foundation 2, which contributes an increase in the percentage of building grounding. Among the piles 6, a pile arranged at the center portion in a horizontal direction has a length shorter than that of a pile 6 arranged at the periphery portion in a horizontal direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a basic structure of a reactor building including a reactor containment vessel and an equipment room associated therewith in a nuclear power plant such as a nuclear power plant equipped with a boiling water reactor.

  In the seismic design of the reactor building, evaluation is performed considering the rise of the reactor building foundation. In the evaluation taking into account the rise of the reactor building foundation, an evaluation is performed using the building ground contact ratio, which is an index for evaluating the seismic safety against the force of overturning the building.

  In recent years, the seismic resistance of reactor buildings has become stricter. Therefore, the building foundation plane dimensions sufficient to ensure the building ground contact ratio necessary for the design seismic force are set. If the building foundation plane dimensions are increased, the building grounding rate can be secured large, and the need for seismic design that secures the building grounding rate of the reactor building above a certain value can be satisfied.

  As a countermeasure for the horizontal excitation force due to the earthquake, a countermeasure is disclosed in which the lower structure of the reactor building foundation is engaged with the rock mass as an uneven structure (see, for example, Patent Document 1). In Patent Document 1, a plurality of projecting portions or groove portions are dispersedly formed on the bottom surface of the reactor building foundation, and the groove portions and projecting portions corresponding to these projecting portions or groove portions are formed on the rock. In order to disperse the horizontal shearing force up and down, and to make the structure that effectively transmits the horizontal shearing force due to the earthquake to the rock mass by engaging both in the horizontal direction, It is described that the long and short are attached to.

JP-A-52-71816

  As the seismic ground motion for the design of the reactor building increases, it is difficult to secure the ground contact ratio necessary for the reactor building by expanding the reactor building foundation plane dimensions.

  In addition, if the reactor building foundation plane dimensions are enlarged to ensure the building ground contact ratio, the reactor building layout is restricted and the effective use of the site site is hindered.

  Accordingly, an object of the present invention is to provide a reactor building foundation structure in which the building overturning moment is suppressed without depending on the expansion of the reactor building foundation plane dimension.

  Means for achieving the object of the present invention is to adopt a reactor building foundation structure in which a pile integrated with the foundation is provided at a lower portion of the foundation of the reactor building.

  Preferably, a plurality of the piles are dispersed and provided on the foundation.

  By adopting such a reactor building foundation structure, it is possible to ensure the necessary grounding ratio of the building and to suppress the building overturning moment well without enlarging the reactor building foundation plane dimension.

  More preferably, the length of the pile is longer in the pile arranged than the outer peripheral portion of the foundation of the reactor building, and shorter than that in the pile arranged in the central portion.

  If it does in this way, the quantity of a pile can be controlled.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to ensure the grounding state which raises suppression of the building fall moment of a reactor building, without enlarging a reactor building foundation plane dimension.

It is a longitudinal cross-sectional view of the reactor building and the reactor building foundation by the Example of this invention. It is the figure which looked at the reactor building foundation of FIG. 1 from the lower part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In the embodiment of the present invention, reinforced concrete piles integrated with the reactor building are distributed on the mask of the reactor building foundation. The length of the pile is set so that the pile position increases as it goes from the central part of the reactor building foundation to the outer peripheral part.

  These piles resist horizontal and vertical excitation forces caused by earthquakes, helping to smoothly transmit the excitation force between the rock mass and the nuclear building, prevent the reactor building from lifting, and suppress the overturning moment.

  Embodiments of the present invention will be described below with reference to the drawings. As an example of a nuclear power plant, an example in which the present invention is applied to a reactor building 5 of a nuclear power plant equipped with a boiling water reactor is shown in FIGS.

  As shown in FIG. 1, in the reactor building 5, a reactor containment vessel 1 is provided in the central portion in the horizontal direction, and a machine room 7 is also provided in the outer peripheral portion. With this arrangement, the reactor containment vessel 1 and the machine room 7 are provided in the reactor building 5.

  A reactor pressure vessel 3 is stored in the reactor containment vessel 1. In this reactor pressure vessel 3, a nuclear reactor core is stored, and thermal energy generated when nuclear fuel in the nuclear reactor core is fissioned causes boiling of the cooling water in the reactor pressure vessel 3 to generate steam. It has a configuration. The steam is led out of the reactor building 5 by piping and supplied as driving energy to the steam turbine, and the driven steam turbine has a configuration in which the generator is driven to rotate to generate electric power.

  The reactor containment vessel 1 is made of reinforced concrete with a liner on the inside in order to have a pressure resistance and leakage resistance function against the gas generated inside, the reactor containment vessel 1 wall side, the reactor building foundation 2 bottom surface, And the horizontal section which makes the upper part a dome-shaped top head and a top slab has a cylindrical shape.

  The reactor pressure vessel 3 is supported on the reactor building foundation 2 via the reactor pressure vessel foundation 4. The machine room 7 arranged around the reactor containment vessel 1 is also supported by the reactor building foundation 2 in the same manner as the reactor containment vessel 1 and the reactor pressure vessel foundation 4.

  As described above, the reactor building 5 mainly includes the reactor pressure vessel 3, the reactor containment vessel 1, the reactor pressure vessel foundation 4, the machine room 7, and the reactor building foundation 2. The reactor building 5 and the reactor building foundation 2 are constructed of reinforced concrete after ensuring the structural strength necessary as a supporting strength member and the thickness necessary for shielding radiation to the periphery.

  Here, when a horizontal seismic force acts on the reactor building 5, a rotational moment centered on the position of the center of gravity of the reactor building 5 is generated as a tipping moment. Since this rotational moment is a load that causes the reactor building 5 to overturn, it is necessary to adopt an earthquake-resistant construction so that the reactor building 5 does not overturn.

  As a configuration of this seismic capability, if the plane dimension of the reactor building foundation 2 is enlarged and the resistance to the overturning moment generated by the earthquake is increased, the layout layout of the reactor building is limited depending on the site conditions of the nuclear power plant. The harmful effect that the effective use of the site of the nuclear power plant is hindered.

  In order to avoid the adverse effects, it was decided to achieve the earthquake resistance with the configuration shown in FIGS. That is, as shown in FIG. 1, a structure in which a plurality of studs 6 that are stud-like projecting structures are distributed and arranged at the lower part of the reactor building foundation 2 is provided, and the length of the pile 6 is the same as that of the reactor building foundation 2. The length is set to be different so that the length is shorter at the center and longer at the outer periphery.

  Although each pile 6 is indicated by a circle in FIG. 2, each pile 6 has a columnar shape and is integrated with the reactor building foundation 2. Therefore, each pile 6 is integrated with the reactor building foundation 2 in a reinforced concrete structure similarly to the structure of the reactor building foundation 2. Moreover, the plane dimension and length of each pile 6 are ensured and set by the necessary seismic force.

  Each pile 6 is buried in the bedrock, the adhesion between the reactor building foundation 2 and the bedrock becomes stronger, it is possible to suppress the overturning moment, and the building grounding without increasing the plane dimensions of the reactor building foundation 2 The rate can be increased.

  Furthermore, by adopting a structure in which a pile 6 is provided at the lower part of the reactor building foundation 2, the contact area between the reactor building foundation 2 and the bedrock increases with respect to vertical ground motion, and the overhanging structure 6 parts and the bedrock Thus, the response of the reactor building 5 due to vertical ground motion can be reduced.

  Moreover, about the length of each pile 6, the length of the pile 6 arrange | positioned at the horizontal direction center part side of the reactor building foundation 2 is made shorter than the length of the pile 6 located in the outer side (outer peripheral part). Thus, the amount of the pile 6 can be reduced without reducing the effect of suppressing the overturning moment.

  As described above, by providing the stud-shaped overhang structure 6 having different lengths at the lower part of the reactor building foundation 2, it is possible to suppress the overturning moment without enlarging the planar dimensions of the reactor building foundation 2. Since the ground contact ratio can be increased, the site of the nuclear power plant can be used effectively.

  The present invention can be used for the basic structure of a nuclear power plant reactor building.

1 Reactor containment vessel 2 Reactor building foundation 3 Reactor pressure vessel 4 Reactor pressure vessel foundation 5 Reactor building 6 Pile 7 Machine room

Claims (4)

  A nuclear plant nuclear reactor building foundation structure comprising a pile integrated with the foundation at the bottom of the nuclear plant nuclear reactor building foundation.   The nuclear reactor reactor building foundation structure according to claim 1, wherein a plurality of the piles are dispersed and provided on the foundation.   3. The nuclear power according to claim 2, wherein the piles are set shorter than the piles provided from the outer peripheral part of the foundation of the reactor building and shorter than the piles provided from the central part. The reactor building foundation structure of the plant.   The reactor building according to any one of claims 1 to 3, wherein the reactor building includes a reactor containment vessel containing a reactor pressure vessel, a machine room disposed around the reactor containment vessel, and the atomic reactor. A nuclear reactor reactor building foundation structure comprising a reactor containment vessel and the foundation supporting the machine room.

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