JP2945706B2 - Reactor pressure vessel support base - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a structure for supporting a reactor pressure vessel in a boiling water nuclear power plant, and in particular, pipes and ducts for the reactor pressure vessel supporting platform. The invention relates to a reactor pressure vessel support pedestal that accommodates reactors, vents, cables and the like.

(Conventional technology) In a boiling water nuclear power plant, a reactor containment vessel is housed in a reactor building, and a reactor pressure vessel (hereinafter referred to as an RPV) housed in the reactor containment vessel has a reactor pressure. It is supported on a container support base (hereinafter, referred to as an RPV support base). Conventionally, the structure of this RPV support base is disclosed in JP-A-63-28449.
As shown in FIG. 4, a plurality of cylindrical iron plates 1 arranged concentrically and a plurality of iron plates 2 arranged radially are also disclosed in Japanese Patent Publication No. Then, concrete 4 is poured into this cylindrical assembly while leaving a plurality of openings 3 to form an RPV support base 5.
A component member 6 for guiding pipes, cables, and the like is inserted into the opening 3 of the RPV support base 5, and pipes, cables, and the like are inserted and guided in the component member 6. In this way, RP
Piping and cable box (chute) in V support base 5
Etc. can be stored.

(Problems to be Solved by the Invention) The conventional RPV support gantry is generally installed after the RPV support gantry is completed by inserting the component members 6 such as pipes and cables into the opening 3 for installation. The installation work of the component member 6 for guiding the pipes and the like in the narrow opening 3 of the RPV support base 5 was required.

The present invention has been made in view of the above circumstances, and while eliminating the need for installation work such as cable boxes and ducts, even if installation work is not required, a large number of pipes, cables,
It is an object of the present invention to provide an RPV support gantry in which a duct, a vent, and the like can be housed by penetrating the RPV support gantry.

[Configuration of the invention]

(Means for Solving the Problems) In order to solve the above-mentioned problems, the RPV support pedestal according to the present invention has a reactor pressure vessel support pedestal supporting a lower part of a reactor pressure vessel, and an upper dry well and a lower dry well. While forming the boundary with the pressure suppression chamber, the reactor pressure vessel support pedestal integrally assembles a plurality of concentrically arranged cylindrical iron plates and a plurality of radially arranged iron plates, and assembles this cylinder. In what is configured by injecting concrete leaving a plurality of openings communicating the dry well and the pressure suppression chamber to the body, each opening of the reactor pressure vessel support pedestal,
The air conditioning duct, cable box and vent are manufactured to have predetermined dimensions and shapes, and can be used as air conditioning duct, cable box and vent as they are after the construction of the reactor pressure vessel support base. is there.

(Operation) This RPV support gantry is composed of a cylindrical assembly in which a multi-cylindrical iron plate and a radial iron plate are integrally assembled, and concrete is poured into the cylindrical assembly leaving a plurality of openings to form an RPV support gantry.
Since the opening of the RPV support base is used as a pipe through-hole, duct, cable box, and vent, many pipes, cables, ducts, etc., are required to connect the upper and lower spaces in the PCV. It is effective for nuclear power plants and does not impair the function of the RPV support base structure.

In addition, since the opening of the RPV support base can be directly used as a pipe through-hole, duct, cable box, and vent, installation work for cable boxes and ducts is not required, while guides for piping and cables to the opening are provided. It is necessary to install the constituent members. In addition, the pipe does not need to be mounted via a pipe support or an installation tool, and the pipe can be installed and held by a simple temporary setting of the pipe by injecting concrete into the pipe penetration part and hardening.

(Example) Hereinafter, an example of an RPV support base according to the present invention will be described with reference to the accompanying drawings.

FIG. 2 shows a boiling water reactor system having an RPV support base according to the present invention. The reactor system is a reactor building.
A reactor containment vessel 11 is stored in 10. A reactor pressure vessel (RPV) 12 is accommodated in the reactor containment vessel 11, and the RPV 12 is constructed on a reactor building mat 13 and supported by an upright RPV support base 14.

As shown in FIGS. 1 and 3, the RPV support base 14 integrally connects a plurality of cylindrical iron plates 15 arranged concentrically and a plurality of iron plates 16 arranged radially. It has an assembled cylindrical assembly 17, and is constituted by injecting concrete 19 into the cylindrical assembly 17 while leaving a plurality of openings 18.

Further, as shown in FIG.
It is divided into an upper dry well 20 and a lower pressure suppression chamber 21 as a wet well. This pressure suppression chamber 21 is an RPV
It is located outside the support base 14. The pressure suppression chamber 21 functions as a suppression chamber, and is a chamber that stores pool water during operation of the reactor and condenses steam generated in the containment vessel 11 during an accident.

On the other hand, a plurality of openings 18 formed in the RPV support
Is an opening for guiding steam generated in the containment vessel 11 during the accident to the pressure suppression chamber 21, an opening for communicating with the air conditioning duct 22 for adjusting the temperature in the containment vessel 11, and an RPV 12
This is an opening for wiring the cable 23 to the equipment below. In addition, a pipe 24 connecting the upper and lower parts of the reactor containment vessel 11 is
After being inserted into the opening 18 of the RPV support base 14, the concrete 25 is buried and temporarily fixed by injecting concrete 25, and is penetrated and held in the opening 18.

Next, the construction and operation of the RPV support base 14 will be described.

The RPV support base 14 is formed by integrally combining a multi-cylindrical iron plate 15 and a radial iron plate 16 on a reactor building mat 13 and a cylindrical assembly 17.
Is assembled, and concrete 19 is poured into the cylindrical assembly 17 while leaving a plurality of openings 18. When the cylindrical assembly 17 is constructed from the iron plates 15 and 16, each opening 18 is set to a dimensional shape according to each purpose.

Each opening 18 formed in the RPV support base 14 has an air conditioning duct 22, a cable box for guiding a cable 23,
It is configured as a vent as an opening for introducing steam or a pipe through hole as a pipe insertion opening, and connects the pressure suppression chamber 21 and the dry well 20 in the reactor containment vessel 11 below the RPV 12 through a number of openings 18. Contact. Among these, the pipe 24 inserted into the opening 18 is inserted into the opening 18, and after the penetration setting (temporary setting), is fixed by pouring concrete 25, and is fixed and held in the opening 18. This pipe holding (installation) work only needs to inject concrete 25 into the corresponding opening 18 of the RPV support base 14, so that complicated work in the narrow space of the opening 18 can be omitted, and the pipe holding and fixing work can be omitted. Is simplified.

〔The invention's effect〕

As described above, in the reactor pressure vessel supporting pedestal according to the present invention, the opening formed in the reactor pressure vessel supporting pedestal is configured as a duct, a cable box, a vent, or a pipe through-hole, so that the reactor The opening of the pressure vessel support base can be used immediately as an air conditioning duct, cable box (cable duct), or vent, and pipes, cables, and ducts that connect the upper space and lower space inside the containment vessel can be used. It is particularly effective and suitable for nuclear power plants that require a large number.

In addition, since the opening of the reactor pressure vessel support base was used as it was as a cable box or duct, installation work to separately install the cable box and duct was not required, but after the reactor pressure vessel support base was constructed Since the work inside the support gantry is only temporary setting of pipes in the opening, the construction work period on site can be greatly reduced.

In addition, the reactor pressure vessel support base uses an RPV support base construction structure that fills the other parts with concrete while leaving each opening, so that physical and mechanical strength can be sufficiently maintained except for the openings. The opening itself can be used as it is as an air conditioning duct, cable box, and vent after the RPV support base is built.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing an embodiment of a reactor pressure vessel support base according to the present invention, and FIG. 2 is a boiling water nuclear power generation facility to which the reactor pressure vessel support base of the present invention is applied. FIG. 3 is a plan sectional view showing a reactor pressure vessel support gantry of the present invention, and FIG. 4 is a plan sectional view showing a conventional reactor pressure vessel support gantry of the present invention. 10 Reactor building, 11 Reactor containment vessel, 12 Reactor pressure vessel (RPV), 13 Reactor building mat, 14
Reactor pressure vessel support gantry (RPV support gantry), 15, 16… Iron plate, 17… Cylindrical assembly, 18… Opening, 19, 25… Concrete, 22… Duct, 23… Cable, 24 ……Piping.

Claims (1)

(57) [Claims] 1. A reactor pressure vessel support base for supporting a lower part of a reactor pressure vessel forms a boundary between an upper dry well and a lower pressure suppression chamber, while the reactor pressure vessel support base has a concentric shape. A plurality of cylindrical iron plates and a plurality of radially arranged iron plates are integrally assembled, and concrete is left in this cylindrical assembly while leaving a plurality of openings communicating the drywell and the pressure suppression chamber. In the one constructed by injection, each opening of the reactor pressure vessel support pedestal is manufactured in a predetermined size and shape for an air conditioning duct, a cable box and a vent, and the reactor pressure vessel support pedestal is After the construction of the air conditioning duct,
A reactor pressure vessel support base having a structure usable as a cable box and a vent.