JPH0220960B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement of a nuclear reactor containment vessel, and particularly relates to a reactor containment vessel in which the effective space within the containment vessel is expanded by improving the installation structure of piping, electric conduits, or cable trays. .

Generally, the reactor containment vessel of a nuclear power plant consists of a drywell that houses the reactor pressure vessel, a suppression chamber that stores pool water, and a vent pipe that communicates between these drywells and the suppression chamber. It is composed of. A pipe whip structure is constructed between the pressure vessel pedestal in the dry well and the reactor shield wall, and is used to connect various mechanical equipment, piping, etc.
Wire conduits, cable trays, etc. are arranged, but these equipment and piping come in many types and numbers, and the pipe whip structure that supports their weight is also large-scale. Internal equipment placement space and piping space are subject to restrictions. In particular, there is a large amount of piping, conduit, or cable trays, and when they are laid, sufficient clearance is required between each other or from other equipment or structures due to construction errors, heat transfer, and earthquake resistance. Furthermore, since the beam is laid so as to bypass the intersection with the beam member, the installation space becomes very large.

Here, an example of a detour at the intersection of the pipe whip structure 10 and the pipe 11 will be described with reference to FIGS. 11 to 13. 11 and 12, a pipe 11 is disposed via an L-shaped steel 30 and a U-bolt 31 to a lower flange 10b forming a beam 10 of a pipe whip structure made of H-shaped steel. The pipe 11 is detoured at a place where it intersects with another beam 32, and is supported by a support 33 projecting from another beam 32 as shown in FIG.

For this reason, conventional reactor containment vessels have little free space, making it extremely difficult to secure inspection space and passage space for personnel, especially during the period of service. In addition, the required number of supports to securely support piping, cable trays, etc. has increased, and the mounting positions of these supports have also changed.
The selection of the optimal location is often constrained by seismic calculations.

The present invention was made in view of the above circumstances, and
At least three sides of a beam of a steel structure such as a horizontal beam or a vertical beam of a pipe whip structure constructed in a reactor containment vessel are shielded by the main body of the beam. Utilize the remaining space to lay various types of piping, cable trays, raceways, etc., and also connect other steel structures and various types of piping, raceways, or cable trays that block the remaining space of the beams of the installed steel structure. By drilling through holes in other steel structures and passing piping through the interfering parts (hereinafter referred to as intersection points), we can provide flexibility in the arrangement space for equipment and expand the effective space. The purpose of the present invention is to provide a reactor containment vessel that can secure the space required for inspection and personnel passage during its use.

Hereinafter, one embodiment of the reactor containment vessel according to the present invention will be described with reference to the drawings.

As illustrated in FIGS. 1 and 2, a reactor containment vessel 1 of a nuclear power plant includes a reactor pressure vessel 2.
A suppression chamber 5 stores pool water 4, and a vent pipe 6 communicates between the dry well and the suppression chamber.

Inside the dry well 3, a pipe whip structure 9 is constructed around the pressure vessel pedestal 7 and the reactor shielding wall 8, and various mechanical equipment, piping, electrical conduits, cable trays, etc. are installed using this structure. be done.

FIGS. 3 and 4 show that when the pipe whip structure 10 is made of H-beam steel, a small-diameter Piping 1
1 is attached and supported using U bolts 12.

Figures 5 and 6 show an example in which, when a small-diameter pipe 11 intersects with a pipe 10 made of H-shaped steel, a pipe through hole 13 is provided in the web of the beam at this intersection point, and the pipe 11 is inserted into this hole. show. In this case, pipe 1
1 is placed on a support pedestal 14 before and after the through hole 13, and is supported and fixed by U bolts 12. Note that the through-hole portion of the beam is reinforced with a reinforcing material (not shown) as necessary.

FIGS. 7 and 8 show that when the cable tray 15 intersects with the beam 10 made of H-shaped steel, a rectangular through hole 16 is provided in the beam at the point of intersection, and the cable tray 15 is inserted through this hole. Give an example. In this case, the cable tray 15 is placed on the support pedestal 14 before and after the through hole 16, and is fixed using bolts and nuts 17. Reference numeral 18 indicates a reinforcing material for reinforcing the through hole portion.

9 and 10 show an example in which, when a small-diameter pipe 11 intersects with a pipe 19 made of box-shaped steel, a through hole 20 is provided in the beam at the crossing point, and the pipe 11 is inserted into this hole. In this case, the through hole 20 has
A sleeve 22 with four pairs of guides 21 protruding inward from both ends is inserted and fixed, and a protrusion 23 is formed on the piping 11 side to slidably engage with the guides 22 to prevent thermal expansion and contraction of the piping 11. Allows for axial movement due to

The present invention has been described above with reference to four embodiments, but as is clear from these embodiments, according to the present invention, by attaching piping to a beam, at least three sides of the beam are shielded by the main body of the beam. The remaining space can be effectively used as installation space for piping, and since a through hole is provided in the beam at the intersection with the beam, it is possible to pass through the hole, which is necessary when bypassing the hole. In addition to eliminating the need for additional occupied area, support can be provided at the beam penetrating portion, so the space required for support can be reduced.

Therefore, the effective space within the dry well is expanded, the degree of freedom in installing various equipment and piping is increased, and it is possible to secure sufficient passage space for inspection and personnel during the service period.

It goes without saying that the present invention is not limited to the MARKI type nuclear reactor containment vessel shown in FIG. 1, but can be similarly applied to containment vessels of the same type or the same type.

[Brief explanation of drawings]

FIG. 1 is a conceptual vertical cross-sectional view showing an example of a nuclear reactor containment vessel according to the present invention, and FIG. 2 is an A-A in FIG.
A conceptual cross-sectional end view taken along the line, Fig. 3 is a side view showing an example in which piping is installed along an H-shaped steel beam in the present invention, Fig. 4 is a cross-sectional view thereof, and Fig. 5 is a cross-sectional view of the present invention. Fig. 6 is a cross-sectional view of the pipe, and Fig. 7 is a side view showing an example in which the piping is supported through the H-shaped steel beam in the present invention. FIG. 8 is a side view showing an example, FIG. 8 is a cross-sectional view thereof, FIG.
The figure is a cross-sectional view, Figure 11 is a side view showing a conventional example in which piping is installed along the beam of a pipe whip structure made of H-shaped steel, and Figure 12 is B of Figure 11.
13 is a cross-sectional view taken along the line CC in FIG. 11. 1...Reactor containment vessel, 2...Reactor pressure vessel, 3
... Dry well, 4... Pool water, 5... Suppression chamber, 6... Vent pipe, 7... Pressure vessel pedestal, 8... Reactor shielding wall, 9... Pipe whip structure, 10... Beam, 11... Piping, 12
... U bolt, 13 ... Through hole, 14 ... Support frame, 1
5... Cable tray, 16... Through hole, 18... Reinforcement material, 19... Beam, 20... Through hole, 21... Guide, 2
2...Sleeve, 23...Protrusion.

Claims (1)

[Scope of Claims] 1. Laying various piping, electrical conduit or cable trays in the remaining space formed by at least three sides of the beam of the steel structure built in the reactor containment vessel being shielded by the main body of the beam, At the interference part between the steel structure that blocks the remaining space of the beam of the laid steel structure and various piping, conduit, or cable tray, the steel structure that blocks the remaining space may A nuclear reactor containment vessel characterized by being formed with a through hole through which a cable tray passes. 2 the piping, conduit or cable tray;
The reactor containment vessel according to claim 1, wherein the reactor containment vessel is supported via a support in the remaining space. 3. The reactor containment vessel according to claim 2, wherein the support comprises a support pedestal on which the piping, electric conduit, or cable tray is placed and which is disposed before and after the through hole. 4. The reactor containment vessel according to claim 2, wherein the support is a reinforcing material disposed on the inner wall surface of the through hole. 5. The nuclear reactor according to claim 2, wherein the support supports the piping, conduit, or cable tray in an axially movable manner and is comprised of a sleeve inserted into the through hole. Containment vessel. 6 the sleeve and the pipe inserted through the sleeve;
A nuclear reactor containment vessel according to claim 5, characterized in that a guide and a protrusion slidably engaged with the guide are provided between the electric conduit or the cable tray.