JPS58106496A - Method of building reactor container facility - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a method for constructing a nuclear reactor containment facility.

Technical Reactor Containment Facility Surrounding a Reactor Pressure Vessel of the Invention Conventionally, the outside of the reactor containment vessel made of stainless steel is further surrounded by a concrete shielding wall at a required interval, and the shielding wall is It had a structure with a storage pool connected to the top. However, in order to provide the containment vessel with a certain level of strength, such containment fI+ facilities must be buried in thick pipes, and furthermore, the containment vessel and the shielding wall are constructed separately, which requires a long period of time to construct. However, since the work involved rotation, there was a problem in that both material costs and construction costs were high.

Therefore, in recent years, it has been considered to construct a reactor containment vessel by making the conventional containment vessel and shielding wall made of cotton, and lining the inner surface of the concrete wall with stainless steel S plates. In such a structure, the concrete walls maintain sufficient strength, so the thickness of the stainless steel plate can be made thinner.
Moreover, the construction period can be reduced completely, but in order to avoid the action of external forces on the containment vessel, the reactor storage pool and equipment storage pool must be constructed separately from the containment vessel. The configuration of this orifice is shown in FIG.

In other words, in FIG.
are provided consecutively.

And furthermore, on the outer surface 1 there is a conch IJ-) wall 4 A
A containment vessel 5 whose inner surface is lined with a stainless steel plate 4B is provided. The upper part of the containment vessel 5 is an upper wall part 5A that bends inward.
The inner periphery of the tract is located above the biological shielding wall 3. Further, a diaphragm floor 6 is arranged horizontally between the Fil'1 container 5 and the upper end of the pressure vessel foundation 2, and above the diaphragm floor 6 are the biological salmon barrier wall 3 and the containment vessel. A piping support pedestal 7 is provided within a space of ml between the peripheral wall portion 5B of 5 and the diaphragm floor 6 as a base. A storage pool 8, such as a fuel storage pool and an equipment storage pool, is installed above the containment vessel 5, which is separate from the containment vessel 5.

Next, a method of constructing such a nuclear reactor containment facility will be explained. First, reactor pressure vessel foundation 2 and containment vessel 50
After constructing the lower half of the peripheral wall portion 5B, the upper ends of both are connected by a diaphragm floor 6. After the diaphragm floor 6 is installed, a biological shielding camphor tree 3 is connected to the upper end of the pressure vessel base W2, and the soil half of the containment vessel peripheral wall 5B is constructed. In constructing the peripheral wall 5B of the containment vessel 5, the concrete wall 4A is constructed by pouring concrete between the stainless steel plate 4B and the formwork.
and the lining of the stainless steel plate 4B are formed at the same time. To explain this with reference to FIGS. 2 to 5, first, as shown in FIG. A drum made of the above-mentioned materials is erected and fixed on a concrete base 9 by an anchor and a bolt 10.

Further, a large number of embedded plates 11 are attached to the side surface of the stainless steel plate 4B. Then, reinforcing bars 12 are arranged on the outer surface of the stainless steel plate 4B as shown in FIG. 3, and formwork 13 is assembled on the side of the reinforcing bars as shown in FIG. 4. Then, a concrete base 9 is placed between the stainless steel 874B and the formwork 13, and the concrete is hardened. When the formwork 13 is removed, a stainless steel plate 4B is placed on the concrete wall as shown in FIG. The containment vessel lined with is completed. After the containment vessel peripheral wall 5B and the biological shielding wall 3 are completed in this manner, a piping support frame 7 is formed between the biological shielding wall 3 and the containment vessel peripheral wall 5B using the diaphragm floor 6 as a base. Part 5 - After installing the stainless steel plate 4B horizontally and placing the reinforcing bars 12 on the upper surface side, concrete is poured and the concrete wall 4A is lined with the stainless steel plate 4B. The container earthen wall portion 5A is formed, and the entire containment container 5 is completed.

At the same time, the containment vessel 5 is built using the containment vessel upper wall portion 5A as a base.
A storage sol 8 such as an equipment storage pool and an equipment storage pool is constructed without contact with the equipment storage pool.

Problems with the Background Art According to the construction method described above, the storage pool 8 is constructed based on the earthen wall portion 5A of the containment vessel 5, so the storage pool 8 is constructed only after the containment vessel 5 is completely completed up to the upper wall portion 5A. 8
cannot begin construction. In other words, after the reinforcement, formwork and concrete placement of the containment vessel soil wall 5A have been completed, construction of the storage sol 8 will not begin until a long curing period is established and sufficient concrete strength is obtained. The problem was that the construction period for the entire reactor containment facility was delayed.

6- Purpose of the Invention The object of the present invention is to connect the metal structure of the soil wall of the containment vessel, which is made of stainless steel plates with reinforcing bars and scaffolding members, to the metal structure of the peripheral wall of the containment vessel in advance. By constructing the storage pool using the above-mentioned scaffolding members as a base, it is possible to start construction of the storage pool without waiting for the concrete of the containment vessel soil walls to harden, thereby shortening the construction period. The aim is to reduce the amount of knowledge required, reduce the number of man-hours required for construction work, and improve work safety.

Summary of the Invention A method for constructing a nuclear reactor containment facility according to the present invention includes: a pressure vessel foundation that fully supports the reactor pressure vessel; a shielding wall that surrounds the pressure vessel continuously from the upper end of the pressure vessel foundation; and the pressure vessel foundation and shielding wall. A peripheral wall of the containment vessel is constructed by lining the inner surface of the concrete wall with stainless steel button plates surrounding the wall, and a piping support frame located between the above-mentioned shielding wall and the containment vessel. A metal structure of the earthen wall of the containment vessel is manufactured by attaching a scaffolding member and a scaffolding member, and this metal structure is supported from below by the piping support frame, and this metal structure is attached to the peripheral wall of the containment vessel. After bonding to the metal structure, concrete is placed on the stainless steel plate, and a storage pool is constructed on the containment vessel using the scaffold 1 member as a base.

Embodiment of the Invention An embodiment of the method for constructing a nuclear reactor containment facility according to the present invention will be explained in order of steps with reference to FIGS. 6 to 10.

First, as shown in FIG. 6, a pressure vessel foundation 52 supporting the reactor pressure vessel 51 and a containment vessel 55 surrounding the outer periphery of the pressure vessel foundation 52 are shown.
A diaphragm floor 56 is lifted up with heavy machinery and opened horizontally between the upper end of the pressure vessel foundation 52 and the lower half of the peripheral wall 55.8. .

Next, as shown in FIG. 7, a biological shielding wall 53 is constructed on the upper end of the pressure vessel foundation 52, and an upper half of the peripheral wall 55B is constructed on the lower half of the containment vessel peripheral wall 55B. In constructing the containment vessel 55, the concrete wall 54 and the stainless steel plate 54B lined on the inner surface thereof are formed at the same time in the same manner as explained in FIGS. 2 to 5. That is, a stainless steel plate 54B is used as an inner formwork, iron tFh 54 C is placed between this stainless steel plate 54B and a formwork provided outside the stainless steel plate 54B, and concrete is poured. Thereafter, a piping support pedestal 57 for supporting the piping system is constructed between the living body shielding wall 53 and the containment vessel peripheral wall 55B using the diaphragm floor 56 as a base. At the same time, some plumbing work was also carried out.

Next, as shown in FIG. 8, a new support pedestal 57A is installed on the piping support pedestal 57, and a metal structure 5 is mounted on the pre-formed containment vessel soil wall 55.
Install 8. As shown in FIG. 9, this metal S base body 58 is divided into a plurality of parts between the circumference 9 and the bottom plate 5Bk and the inner circumferential plate 58B are made of stainless steel plates and are used as scaffolding members. The top plate 58C and the outer circumference SSD are each made of carbon steel plates, and reinforcing bars are arranged between the bottom plate 5Bk and the soil plate 58C.

Moreover, a plurality of concrete filling holes 58E are provided in the earthen plate 58C. The metal birch structure 58 and the top of the peripheral wall 55B of the containment vessel 55 are then connected, for example, by welding the reinforcing bars 58F and 54C and the stainless steel plates of both together. .

Next, as shown in FIG. 10, a storage pool 6o such as a fuel storage pool, an equipment storage pool, etc. is constructed above the metal structure 58 on the earthen wall 55 of the containment vessel. Upper plate 58C,1 which is a scaffolding member of body 58
A plurality of support parts 59 are welded to the surface. Then, through these supporting members 59, first of the storage pool 6o,
The construction of the upper part of the containment vessel 55 is started so that there is a certain distance between it and the containment vessel earthen wall part 55A. That is, regarding the portion of the storage sol 60 located above the containment vessel 55, a joint structure 61 of the bottom wall part 60 and the side wall part 60B is formed in advance in the same manner as the above-mentioned containment vessel upper wall part 55A, After that, it shall be filled with concrete. Therefore, the steel plates 61A constituting the metal structure 61 are welded to the plurality of supporting members 59 without trenches, and other metal structures 6 are sequentially joined. The inside of the metal structure 58 is filled with concrete through the concrete filling hole 58E, and the inside of the metal structure 61 of the storage pool 6o is also filled with concrete through the concrete filling hole 61B. Then, a formwork for constructing the other parts of the storage sol 6θ is placed, and concrete is also poured into the formwork. In this case, the parts of the storage pool 60 that have the steel plate 61Af and the parts that do not have the steel plate 61Af are firmly joined by welding their reinforcing bars to each other. After waiting for the filled concrete to harden, the formwork is removed. Thereafter, the support member 59 and the support frame 57k interposed between the containment vessel soil wall portion 55 and the storage pool 6o are removed. In addition, concrete filling holes 58E and 6 provided in the metal structure 58.61
1B is closed and the reactor containment facility is completed. According to the above construction method, the earthen wall portion 55 of the containment vessel 55 and a part of the storage pool 60 located above it are constructed using the metal #IT construction body 61, respectively. Since the storage pool 60 is constructed based on the upper plate 58C which is a part of the metal structure 58 of the containment vessel earthen wall 55A, concrete pouring of the earthen wall 55A of the containment vessel 55 is possible. The process can be performed at any time. Therefore, there is no need to start construction of the storage pool 60 after a long curing period until the concrete has sufficient strength as in the past, and the assembly of the metal structure 58 to the containment vessel earthen wall 55 is completed. It is also possible to start construction of the storage sol 6o immediately after the completion of construction, and the construction period can be significantly shortened.

In addition, since these metal structures 58 and 61 can be manufactured in advance at the factory, there is no need to worry about stringing the formwork together, and the man-hours can be reduced to just 1J, improving work safety and efficiency. It can be greatly improved.

In addition, in the above embodiment, the portion of the storage pool located above the containment vessel was constructed using a metal structure in the same way as the earthen wall of the containment vessel. It is also possible to introduce the frame and construct it as an integral part.In this case, the formwork for the storage pool can be constructed using the upper plate of the metal structure of the soil wall of the containment vessel as a base. If this is done, it will be troublesome to remove the formwork caught between the containment vessel and the storage pool, but it can be done by using a jack to keep the formwork afloat.

The structure of the metal structure of the upper wall of the containment vessel is also not limited to the above embodiment. For example, in the above embodiment, the upper plate 58
Although it is assumed that C is used as a foot member for constructing a storage pool, a small piece that serves as a scaffolding member may be locally protruded from the upper surface side of the bottom plate ssA.

Young Sprouts of the Invention According to the construction method of the present invention, the metal structure of the earthen wall of the containment vessel is made of a stainless steel plate with reinforcing bars and scaffolding members attached, and the peripheral wall of the containment vessel with a metal elliptical structure After the scaffolding members are connected to the metal structure of the containment vessel, the storage pool can be constructed using the scaffolding members as a base, making it possible to construct the storage pool without waiting for the concrete poured on the earthen walls of the containment vessel to harden. It can take up to 90 minutes and can be poured even before concrete is poured into the earthen wall of the containment vessel.

Therefore, the construction period for reactor containment facility construction can be significantly shortened, the number of man-hours can be significantly reduced, and the safety and efficiency of work can be greatly improved.

[Brief explanation of the drawing]

Figure 1 is a schematic sectional view of a conventional 14-reactor containment facility for explaining the background technology, and Figures 2 to 5 show the process of lining a concrete wall with stainless steel plates in the same reactor containment facility. Cross-sectional view, Figures 6 to 1
0 shows an embodiment of the method of the present invention, and FIG. 6 1.
7 and 8 are sectional views, FIG. 9 is a plan view, and 1.
Figure 0 is a cross-sectional view. 5 No. Reactor pressure vessel, 52... Pressure vessel basics,
53... Living body tracing wall, 54B... Stainless steel copper plate,
55... Containment vessel, 55A... Containment vessel upper wall, 5
5B... Containment vessel peripheral wall part, 57... Piping support frame,
58.61...Metal sink, 58C...Soil board (scaffolding member), 60...Storage pool〇Applicant's representative Patent attorney Suzue Takehiko Section 15- Figure 1

Claims (2)

[Claims] (1) A pressure vessel foundation that supports the reactor pressure vessel, a shielding wall surrounding the pressure vessel continuous to the upper end of this pressure vessel foundation, and a stainless steel plate on the inner surface of the concrete wall surrounding the pressure vessel foundation and shielding wall. A containment vessel is constructed by constructing a peripheral wall of the containment vessel with an inner lining, a piping support frame located between the shielding wall and the peripheral wall of the containment vessel, and attaching reinforcing bars and scaffolding members to stainless steel plates in advance. 4!14 gold ingots were manufactured for the earthen wall of the container, this metal structure was supported from below by the piping support frame, and this metal structure was connected to the metal structure of the peripheral wall of the containment vessel. After that, concrete is poured on the stainless steel plate,
and a method for constructing a nuclear reactor containment facility, comprising constructing a storage pool on the containment vessel using the scaffolding member as a foundation. (2) Concrete placement on the stainless steel plate is carried out at the same time as a part of the storage pool after the part of the storage pool is constructed. 'H-crotch construction method.