JPH0263196B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a suppression chamber storage chamber and a construction method thereof.

[Background of the invention]

The mark-type reactor containment vessel of a boiling water reactor has a donut-shaped suppression chamber. The conventional suppression chamber storage room that stores such a suppression chamber is
Shown in Figure 1. A suppression chamber 17 having cooling water 18 inside is installed on the floor.
An inner wall 25 and an outer wall 26 exist to surround the suppression chamber 17. A reinforcing beam 41 is installed at the upper ends of the inner wall 25 and the outer wall 26. A ceiling section 28 is installed above the reinforcing beam 41. Piping 32 is installed between the suppression chamber 17 and the reinforcing beam 41 within the suppression chamber storage chamber 42, which is composed of the inner wall 25, the outer wall 26, the floor 27, and the ceiling 28. . Such a suppression chamber storage chamber is shown in Japanese Patent Laid-Open No. 58-225286.

[Purpose of the invention]

An object of the present invention is to reduce the volume of the suppression chamber storage chamber.

[Summary of the invention]

A feature of the present invention is that the piping is arranged in the space formed between the ceiling reinforcing members provided astride the opposing side walls, and that the piping is provided to penetrate through the ceiling reinforcing members. be.

[Embodiments of the invention]

A suppression chamber storage chamber which is a preferred embodiment of the present invention applied to a boiling water reactor having a mark-type reactor containment vessel will be described below. FIGS. 1 and 2 show the suppression chamber storage chamber of this embodiment.

First, the outline of the mark-type reactor containment vessel will be explained with reference to FIG. The reactor containment vessel 2 has a dry well 3 and a suppression chamber 17. The dry well 3 is a sealed container composed of a steel cylindrical container 4, a lid 5, and liner plates 6, 7, and 8 arranged at the bottom. A pedestal 9 is installed in the center of the dry well 3, and the reactor pressure vessel 1 is installed on the pedestal 9. A cylindrical gamma ray shield 13 is installed on the pedestal 9 and surrounds the reactor pressure vessel 1.
The pedestal 9 is composed of a steel cylinder 10 and an outer cylinder 11 arranged concentrically, and a space between the cylinder 10 and the outer cylinder 11 is filled with concrete 12.

The lower ends of the cylindrical container 4, inner tube 10, and outer tube 11 are fixed to a foundation concrete mat 15 with anchor bolts 14. Concrete 16 is filled between the liner plates 6, 7 and 8 and the foundation mat concrete 15.

The suppression chamber 17 has a circular longitudinal section and a ring shape as shown in FIG. The suppression chamber 17 surrounds the dry well 3 and is installed on the foundation concrete mat 15. Cooling water 18 is filled in the suppression chamber 17.

A vent pipe 19 is attached near the lower end of the cylindrical container 4 and communicates with the space within the dry well 3. A ring header 20 is installed above the liquid level of the cooling water 18 in the suppression chamber 17. Vent pipe 19 is connected to ring header 20. A plurality of downcomer pipes 21 are attached to the ring header 20, and the downcomer pipes 21
The lower part is immersed in cooling water 18.

For example, if a recirculation pipe (not shown but located in the dry well 3) connected to the reactor pressure vessel 1 is ruptured, the high temperature and high pressure cooling water in the reactor pressure vessel 1 will be turned into steam. It erupts into the dry well 3. This steam is transferred to the vent pipe 19, the ring header 20 and the downcomer pipe 2.
1 and is ejected into the cooling water 18 in the suppression chamber 17, where it is condensed.

The reactor containment vessel 2 is installed within a reactor building 22. A radiation shielding wall 23 that is a part of the reactor building 22 surrounds the cylindrical container 4 while facing the outer surface of the cylindrical container 4 .

A suppression chamber storage chamber 24 is arranged in the lower part of the reactor building 22. The suppression chamber storage chamber 24 is the reactor building 22. The suppression chamber storage chamber 24 is an annular chamber that stores the suppression chamber 17 therein. Suppression chamber storage room 24
surrounds Drywell 3. The suppression chamber storage chamber 24 has an inner wall 25 and an outer wall 2.
6, defined by a floor 27 and a ceiling 28.
In this embodiment, the inner wall 25 also serves as the lower portion of the radiation shielding wall 23. The floor 27 is a foundation concrete pine 15. Radiation shielding wall 2
5. The outer wall 26, floor 27, and ceiling part 28 are made of concrete and reinforcing steel. The ceiling part 28 is
It is used as the floor of the upper floor of the suppression chamber storage room 24. Since heavy objects and the like are installed on this upper floor, the ceiling portion 28 is reinforced with steel reinforcing beams 31. Reinforcement beam 31
is arranged at the upper end of the suppression chamber storage chamber 24 and fixed to the inner wall 25 and the outer wall 26. The upper end of the reinforcing beam 31 is in contact with the ceiling portion 28. A large number of reinforcing beams 31 are installed in the circumferential direction of the suppression chamber storage chamber 24, as shown in FIG. Inside the suppression chamber storage chamber 24, a large number of pipes for systems such as an emergency core cooling system and an auxiliary equipment cooling system are installed. These pipes 32 are installed through holes 33 provided in the reinforcing beam 31 and are supported by the reinforcing beam 31. In this embodiment, a new support structure for supporting the pipe 32 is unnecessary, and the reinforcing beam 32 is not required.
1 has the function of its supporting structure. Piping 32
Although not shown, the reinforcing beam 31 is secured with a band or the like to prevent it from shifting in the longitudinal direction of the reinforcing beam 31.
installed on. Some of the pipes 32, such as pipe 32A, penetrate the outer wall 26 and are led to other rooms in the reactor building 22 adjacent to the suppression chamber storage chamber 24. Further, the emergency core cooling system piping 32B passes through the inner wall 25 and the cylindrical vessel 4, is guided into the dry well 3, and is connected to the reactor pressure vessel 1. Reinforcement beam 31
As shown in FIG. 3, several holes 33 are provided through which pipes 32 pass. Ribs 34 are arranged around these holes 33 so as to surround them. These ribs 34 are attached to both sides of the reinforcing beam 31, as shown in FIG. The ribs 34 prevent the strength of the reinforcing beam 31 from decreasing due to the provision of the holes 33.

In this embodiment, since the piping 32 is arranged using the space between the adjacent reinforcing beams 31 in the suppression chamber storage chamber 24, the position of the apex of the suppression chamber 17 is and ceiling part 2
8 can be made smaller than before.
Therefore, the height of the suppression chamber storage chamber 24 can be reduced, and the volume of the reactor building 22 can be reduced accordingly. Since the reinforcing beam 31 also serves as a pipe support structure, there is no need to provide a new pipe support structure. This simplifies the structure of the suppression chamber storage chamber 24. That is, the amount of structural material in the suppression chamber storage chamber 24 can be significantly reduced compared to the conventional structure.

It is also possible to arrange the cable trays through the reinforcing beams 31 in the same way as the pipes 32.

Suppression chamber storage chamber 24 of this embodiment
The construction method is explained below. The reinforcing beam 31 and piping 32 installed as shown in FIG. 2 are manufactured in a factory in a state in which they are divided into several reinforcing beam blocks in the circumferential direction of the suppression chamber storage chamber 24. The reinforcing beams 31 are constructed into respective reinforcing beam blocks as indicated by X ₁ , X ₂ , X ₃ , . . . in FIG. The structure of the reinforcing beam block 35 is shown in FIG. The reinforcement beam block 35 includes a plurality of reinforcement beams 31 and side wall beams 3.
It has 6A and 36B and piping 32. Adjacent reinforcing beams 31 are connected by opposing side wall beams 36A and 36B. Both ends of the side wall beams 36A and 36B are attached to the ends of the reinforcing beam 31 by welding, respectively.
Furthermore, one end of another set of side wall beams 36A and 36B is attached to both ends of one reinforcing beam 31 by welding. The length of sidewall beam 36A is longer than the length of sidewall beam 36B, and each reinforcement beam 31 extends from sidewall beam 36B to sidewall beam 36.
It is arranged to widen towards A. In figure 2
In the reinforcing beam block placed at position _X3 , some of the reinforcing beams 31 are arranged in parallel. The pipe 32 passes through the hole 33 and is attached to the reinforcing beam 31 with a band or the like. The size of the reinforcing beam block 35, that is, the number of reinforcing beams 31 and the length of the piping 32 constituting the reinforcing beam block 35 are determined in consideration of the possibility of transportation from the factory. The pipes 32 are arranged in the space between the adjacent reinforcing beams 31 and the reinforcing beams 3
1, so the reinforcement beam block 35
can be made into a simple structure and compact. Therefore, the reinforcing beam block 35 can be easily transported.

The parts of the suppression chamber storage chamber 24 other than the reinforcing beam block 35 are made at the installation site of the reactor building 22 of the boiling water reactor. first,
On the foundation concrete mat 15, the lower halves of the inner wall 25 and the outer wall 26 are created by arranging reinforcing bars and pouring concrete as shown in FIG. Naturally, formwork is used when pouring concrete. Producing only the lower half of each wall in this manner facilitates the installation work of the suppression chamber 17, which will be described later. Further, the lower end of the cylindrical container 4 is installed, and the liner plate 6 is also installed. Liner plate 6 and foundation concrete pine 1
Concrete has been placed between 5 and 5. Thereafter, the suppression chamber 17 is carried between the inner wall 25 and the outer wall 26 as shown in FIG.
The suppression chamber 17 is attached to the foundation concrete mat 15 with anchor bolts.
A vent pipe 19 attached to the suppression chamber 17 is connected to the cylindrical container 4. After the suppression chamber 17 is installed, the inner wall 25 and the outer wall 26 are further built up by pouring concrete from the level shown in FIG. 6 to the installation level of the reinforcing beam block 35. That is, the inner wall 25
and the upper end of the outer wall 26 reaches the installation position of the reinforcing beam block 35. When the concrete for each wall has hardened, a plurality of reinforcing beam blocks 35 manufactured at a factory and transported are installed at the upper ends of the inner wall 25 and the outer wall 26, as shown in FIG. Each reinforcing beam block 35 is arranged around the cylindrical container 4 as shown in FIG. and one reinforcing beam block 35 side wall beam 3
6A and 36B and the reinforcing beam 31 of the reinforcing beam block 35 are connected by welding or bolts. In this way, the reinforcing beam blocks placed on the inner wall 25 and the outer wall 26 are interconnected. Also,
Pipes 32 of the same system provided on adjacent reinforcing beam blocks are joined together by welding. Finally, as shown in FIG. 9, concrete for the ceiling 28 and concrete for the height of the reinforcing beam block 35 for the inner wall 25 and outer wall 26 are placed on top of the reinforcing beam block 35. In this way, the suppression chamber storage chamber 24
construction is completed.

Construction of the reactor building 22 continues even after the suppression chamber storage chamber 24 is constructed, and the portions above the suppression chamber storage chamber 24 are successively constructed.

By using the reinforcing beam block 35, most of the installation work for the piping 32 can be done at the factory, reducing the amount of on-site work for the piping 32. Therefore, the construction period for the suppression chamber storage chamber 24 is significantly shortened. That is, in this embodiment, the suppression chamber storage chamber 24 having a small volume can be created in a short period of time. The cooling water is filled into the suppression chamber 17 when the construction of the reactor building 22 is completed.

Cable trays, like piping 32, can be attached to reinforcing beam blocks 35.

Note that without using the reinforcing beam block 35, the reinforcing beams 31 are arranged radially on the inner wall 25 and the outer wall 26 in the state shown in FIG. 8 to form the ceiling part 28 as shown in FIG. It is also possible to arrange the pipe 32 within the hole 33.
Even in this construction method, the suppression chamber storage chamber 24 shown in FIG. 1 can be obtained. However, the piping installation work is more complicated than when using reinforcing beam blocks.

The reactor building shown in Figure 1 also has a dry well 3 of the reactor containment vessel 2 installed inside it.
dry well 9 outside the pedestal 9 at
(liner plate 6), and the bottom surface of the dry well 9 inside the pedestal 9, that is, the space inside the pedestal 9 (space for removing the control rod drive device attached to the bottom of the reactor pressure vessel 1) 40. The bottom surface (liner plate 8) is a flat bottom. Moreover, the bottom of the latter is lower than the bottom of the former. Therefore, the bottom of the space 40 formed in the pedestal 9 below the reactor pressure vessel 1 can be lowered to near the top of the foundation concrete mat 15. Therefore, the height of the pedestal 9 is lowered, the position of the reactor pressure vessel 1 is also lowered, and the height of the dry well 3 is lowered. Further, the thickness of the concrete 16 between the liner plate 6 and the foundation concrete pine 15 can be reduced, and the installation level of the dry well 3 can also be lowered. In addition to reducing the height of the suppression chamber storage chamber 24 mentioned above, the installation level of the dry well 3 and the height of the dry well 3 can be reduced in the reactor building shown in FIG. , the height of the reactor building can be significantly reduced.

〔Effect of the invention〕

According to the present invention, the volume, especially the height, of the suppression chamber storage chamber can be reduced, and the reactor building can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a partial vertical sectional view of a nuclear reactor building having a suppression chamber containing a suppression chamber according to a preferred embodiment of the present invention, FIG. 2 is a cross-sectional view of FIG. Figure 4 is a cross-sectional view of Figure 3, Figure 5 is a perspective view of the reinforcement beam block, Figures 6 to 9 show the construction process of the suppression chamber storage chamber. The explanatory diagram shown in FIG. 10 is a longitudinal sectional view of a conventional suppression chamber storage chamber. 1... Reactor pressure vessel, 2... Reactor containment vessel, 3... Dry well, 6, 7, 8... Liner plate, 9... Pedestal, 16... Concrete,
17... Suppression chamber, 19... Vent pipe, 24... Suppression chamber storage chamber,
25...Inner wall, 26...Outer wall, 27...Floor surface, 2
8... Ceiling part, 31... Reinforcement beam, 32... Piping, 35... Reinforcement beam block, 36A, 36
B...Side wall beam.

Claims (1)

[Scope of Claims] 1. A plurality of side walls provided on a floor surface, a suppression chamber disposed between the side walls and installed on the floor surface, and facing above the suppression chambers. a plurality of ceiling reinforcing members installed across the side walls, a ceiling installed on the ceiling reinforcing members, and an adjacent ceiling reinforcing member; A suppression chamber storage chamber comprising: piping that penetrates the ceiling reinforcing member. 2. A suppression chamber is installed on the floor surface, and a plurality of side walls are provided on the floor surface so that the suppression chamber is interposed therebetween and the upper end thereof reaches above the suppression chamber, A plurality of ceiling reinforcing member blocks, which are formed by arranging piping between a plurality of adjacent ceiling reinforcing members and passing the pipes through the ceiling reinforcing members, are attached to the upper ends of the opposing side walls. 1. A method for constructing a suppression chamber storage room, comprising: first installing a suppression chamber, and then installing a ceiling section on top of each of the ceiling reinforcing member blocks.