JPH0455797A - Nuclear reactor containment - Google Patents

Abstract

PURPOSE:To shorten construction period of a nuclear reactor containment and reduce the number of parts by directly supporting the weight of pipe whip structure with bottom liner on the basement and simplifying supporting structure. CONSTITUTION:A nuclear reactor pedestal 13 is constructed by building double steel cylinders on base anchors 10 in basement 9 and bottom liner 22 and by charging concrete inside. Pipe whip structure 14 is constructed as steel structure on the bottom liner 22 on the base anchors 10. The structure 14 is hence, simplified, because its weight is directly supported on the liner 22. Furthermore, the construction of the pedestal 13 is performed independently from the construction of a steel vessel 20 and a suppression chamber 3, and the construction of the structure 14 is also performed independently from concrete laying work for the basement 9 and a building 19, the construction period for the whole nuclear reactor containment is shortened and the number of parts to support the weight of the structure 14 is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a nuclear reactor containment vessel, and particularly to a technique for arranging a dry well and a suppression chamber adjacent to each other inside and outside a side wall.

U. Prior Art As a conventional technology for a reactor containment vessel in a Langteng water reactor, there is, for example, the technology shown in FIG. 3 of Japanese Utility Model Application No. 61091190.

In the reactor containment vessel of this example in Fig. 3, there is a dry well 2 that accommodates the reactor pressure vessel l, cooling water (pool water)
Pressure suppression chamber (suppression chamber) 3 that stores W
, vent pipe 4, pressure suppression chamber nozzle 5, bellows joint 6,
A vent header 7, a downcomer 8, etc. are provided, and in the event that an accident such as a pipe breakage occurs and steam is ejected, an abnormal pressure increase inside the dry well 2 will cause the steam to be transferred to the vent pipe 4, vent header, etc. 7. By discharging into the pool water W via the downcomer 8 and cooling and condensing it, the internal pressure of the dry well 2 is kept below a certain level and the integrity of the nuclear reactor is maintained.

The weight of the reactor pressure vessel 1 is determined by the foundation anchor 10 buried in the foundation 9 made of concrete, the bottom support 11 erected from the foundation anchor 10, and the steel support 11 on the bottom support 11. It has a structure in which it is supported by a reactor pedestal (3) erected from the bottom of the vessel (12).

Furthermore, inside the dry well 2, a vibe whip structure 14 for supporting various piping including the main steam piping is arranged so as to surround the reactor pressure vessel 1.
Its base is connected to the skirt part 15 through the bottom wall of the steel vessel 12, and its upper inner side is connected to the reactor shielding wall 16, and furthermore, the base N9 and the bottom of the steel vessel 2 In between, a container supporting concrete layer 17 is provided so as to bury the skirt portion 15, and an internal concrete layer 18 is also provided on the bottom of the steel container 12 so as to bury the lower part of the reactor pedestal 13. It is being

"Problems to be Solved by the Invention" However, the structure shown in the example in FIG. 3 causes various problems as follows.

■Reactor containment vessel construction work and each concrete layer 17
・Concrete pouring work during the construction of 18 and biological shielding wall (reactor building) 19 are interrelated, which tends to lengthen the overall construction period.
The present invention has been made in view of the above-mentioned circumstances, in which the amount of equipment and parts related to 4 and sub-renyon chamber 3 increases, and they are likely to interfere with each other's construction work, resulting in increased construction labor. (1) Simplify the structure between the dry well and the sub-rendition chamber, (2) Shorten the construction period for the reactor containment vessel, and (3)
) The purpose is to reduce the number of parts in pipe whip structures and steel container support structures.

``Means for Solving the Problems'' In order to solve the problems, the present invention provides a steel container that partitions and forms a dry well around a reactor pressure vessel, and a steel container that partitions a dry well around a side wall and the base of the steel container. As a reactor containment vessel having a structure comprising a sublesson chamber defined as a part of a partition wall from the bottom liner, and a pipe whip structure disposed upright from the bottom liner inside the F' Lywell. There is.

``Function J: Because a try well and a sub-lenon chamber are arranged inside and outside the side wall of a steel container, pressure based on the head difference of the pool water is applied to a part of the side wall, but the strength of the side wall is increased in advance. Deformation can be suppressed by keeping it in place.

The side walls and the base of the pipe whip structure in the steel vessel have their weight supported directly by the bottom liner on the base, simplifying their support structure.

The construction work of the side walls of the steel vessel and the base of the pipe whip structure is carried out separately without interfering with the concrete pouring work of the reactor building.

"Embodiment" Hereinafter, an embodiment of the reactor containment vessel according to the present invention will be described with reference to FIGS. 1 and 2. In the figure, parts common to the conventional example are given the same reference numerals to simplify the explanation.

In the reactor containment vessel in this embodiment, the R-made vessel 20 that partitions and forms the dry well 2 around the reactor pressure vessel I has a foundation (concrete structure) 9 formed by concrete pouring. Basic anchor 10
The side wall 21 of the lower part of the steel container 20 is connected by welding or the like to the bottom liner 22 affixed to the upper surface of the base part 9, making the dry well 2 a sealed structure. A suppression chamber 3 using the side wall 21 as a part of a partition wall is arranged around the wall 21.

The suppression chamber 3 is housed in a storage space 23 formed in a disk shape in a part of the reactor building 19, and includes an ffl+7 wall 21 used as a partition wall, a bottom liner 22 located outside the wall, and a foundation anchor. A vertical wall 24 rising from the IO and bottom liner 22 and a ceiling wall 25 connecting the vertical wall 24 and the side wall 21 form a sealed annular space.

As shown in FIG. 2, the sub-renyon chamber 3 includes a plurality of vent pipes 4 horizontally penetrating the side wall 21 of the steel container 20 and extending outward. a vent header 26 with the pipes 4 interconnected;
A plurality of downcomers 27 connected to the vent header 26 and positioned at the openings in the pool water W, and the downcomers 2
A hanging tool 28 for suspending 7 from the ceiling wall 25 is provided.

To explain these details, the inner end of the vent pipe 4 is attached to the side wall 21 by welding or the like, and the second
As shown in the figure, for example, eight pieces are provided at equal intervals in the circumferential direction of the suppression chamber 3.

A jet deflector 29 is attached to the inner end of the vent pipe 4, and an appropriate number of vacuum breaker valves 30 are attached to the outer end, as shown in FIG. The vertical wall 24 is provided with a manhole 31 passing through it, and as shown in FIGS. 1 and 2,
A platform 32 is provided in the circumferential direction along the upper inner wall of the suppression chamber 3.
Care is taken so that the vacuum breaker valve 30 and the manhole 31 are located near the top.

As shown in FIGS. 1 and 2, the downcomers 27 are provided, for example, six each, between a pair of adjacent vent pipes 4, and their lower openings are communicated with the pool water W. , and the bottom liner 22 of the tri-well 2;
The bottom liner 22 of the suppression chamber 3 and the bottom liner 22 are arranged on the same plane by aligning the upper surface of the base part 9 with each other.

Next, the reactor pedestal 13 and pipe whip structure 14 will be explained. Similar to the side wall 21 described above, these are connected to the foundation anchor 10 and the bottom liner 22.
The reactor pedestal 13 is a concrete structure using steel plates, for example, and the pipe whip structure 4 is a steel plate structure.

If the reactor containment vessel is configured as described above,
Even if the pressure difference between the inside of the dry well 2 and the upper space of the sublet chamber 3 is 0, pressure based on the head difference of the pool water W is applied to the side wall 21 of the steel container 20. Reducing deformation due to this water head difference and ensuring soundness are achieved by considering the strength of the side wall 21.

As is clear from the comparison with the example in FIG. 3, between the bases of the suppression chamber 3, the pipe whip structure 14, and the steel container 20, there are parts of the reactor building 19 and both concrete layers. 17
・There is no place equivalent to a 18th class concrete structure,
The weight is directly supported by the bottom liner 22 on the upper surface of the foundation 9, and the structure is simplified because it is separated from the concrete structures such as the foundation 9 and the reactor building 19.

Construction work for suppression chamber 3 will be carried out in reactor building 1.
This will be carried out separately from the concrete pouring work for Step 9 and the concrete pouring work for reactor pedestal 13. Vent pipe 4, vent header 26, downcomer 27, hanging tool 28,
Even if the vacuum breaker 30, manhole 31, etc. are assembled and installed during work, their weight is supported by the side wall 21, vertical wall 24, and ceiling wall 25, and they are attached by welding or the like, so it is difficult to perform concrete pouring work. It becomes possible to carry out the work as an independent work without causing any interference.

Furthermore, the reactor pedestal 13 is constructed by standing a steel double cylinder on the foundation anchor IO of the foundation part 9 and the bottom liner 22, and filling the inside with concrete.
Since the bottom liner 22 of the dry well 2 and the suppression chamber 3 is flat, the steel container 2
0 and the subledge gin chamber 3 and can be carried out independently or in parallel.

The pipe whip structure 14 is constructed by standing on the bottom liner 22 above the foundation anchor 10, but as in the case of the suppression chamber 3, concrete pouring work for each concrete structure is carried out. It can be implemented separately.

On the other hand, if an accident such as a pipe rupture occurs in the dry well 2 and steam is ejected (7), if the internal pressure of the dry well 2 becomes high, the impact caused by the jet flow is alleviated by the jet deflector 29. Pressure fluid is sent from the vent pipe 4 to the vent header 26 to be distributed in the circumferential direction, and further, the pressure fluid is jetted from the downcomer z7 into the pool water W, thereby cooling and condensing the steam and drying it. This suppresses the pressure rise in well 2. Furthermore, by releasing the pressure fluid,
If the pressure in the upper space of
0 operates to prevent the generation of a pressure difference between the dry well 2 and the sub-training chamber 3.

"Effects of the Invention" As explained above, the reactor containment vessel according to the present invention provides the following excellent effects.

■Since the dry well and suppression chamber are placed next to each other inside and outside the side wall of the steel container,
The structure of the partition wall of the Zabrenoyon chamber can be simplified.

■The construction work of the steel vessel, suppression chamber, and vibe whip structure is not directly involved in concrete pouring work, and the construction period for the entire reactor containment vessel can be shortened.

■Since there is no concrete structure between the dry well and the suppression chamber, the volumes of the dry well and the suppression chamber can be increased.

■Since the pipe whip structure is erected on the foundation and bottom liner, the number of parts required to support the weight of these parts can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing one embodiment of the reactor containment vessel according to the present invention, Fig. 2 is a view taken along the line ■-■ in Fig. 1, and Fig. 3 is a conventional example of the reactor containment vessel. FIG. 1...Reactor pressure vessel, 2...Dry well, 3...Subrenewal chamber (pressure suppression chamber), 4...Vent pipe, 5... ... Pressure suppression chamber nozzle, 6 ... Bellows joint, 7 ... Vent header, 8 ... Downcomer, 9 ... Foundation, IO ... Foundation anchor, 11...bottom support, 12...steel container, ]3...
・・Reactor pedestal, 14・・Pipe structure, 15・・Skirt part, 16・
... Reactor shielding wall, 17 ... Concrete layer for container support, 18 ... Internal concrete layer, 19 ... Biological shielding wall (reactor building), 20.・・・
... Steel container, 21 ... Side wall, 22 ...
Bottom liner, 23...Storage space, 24...
... Vertical wall, 25 ... Ceiling wall, 26 ...
・Vent header, 27...Downcomer, 28・
... Hanging fixture, 29... Jet deflector,
30... Vacuum breaker valve, 31... Manhole, 32... Bratbohm, W...
・Pool water (cooling water). Figure 2 Applicant Ishikawajima Harima Heavy Industries Co., Ltd.

Claims (1)

[Claims] A steel vessel that defines a dry well around a reactor pressure vessel; a suppression chamber that defines a side wall of the steel vessel and a bottom liner around its base as part of a partition wall; and a dry well. A nuclear reactor containment vessel characterized by comprising a pipe whip structure arranged in a state of being raised from an internal bottom liner.