JPH023477B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a method for laying piping in a nuclear reactor building,
In particular, a reactor building suitable for use when laying piping through a first shielding wall surrounding a reactor containment vessel and a second shielding wall provided on the outer periphery of the first shielding wall. This relates to a piping installation method.

Generally, as a reactor for a nuclear power plant,
For example, a MARK-type nuclear reactor, which is one of the boiling water reactors, shown in FIG. 1 is known.

A large number of pipes P are installed inside the reactor building 1 in which the reactor is installed and inside the reactor containment vessel 3 that houses the reactor pressure vessel 2. In particular, the reactor pressure The interior and external equipment of the reactor containment vessel 3, including the main steam pipe that supplies main steam generated in the vessel 2 to an external power generation turbine, and the water supply pipe that supplies cooling water to the reactor pressure vessel 2. A first shielding wall 4 provided to surround the reactor containment vessel 3 and a second shielding wall 4 provided on the outer periphery of the first shielding wall 4 are connected to each other.
It is laid through the shielding wall 5 of.

By the way, when installing the piping P that connects the inside of the reactor containment vessel 3 and external equipment, radiation leakage or thermal expansion and contraction of the piping P occurs in the portion that penetrates both the shielding walls 5, 5. In order to prevent the concentration of stress associated with this, it is necessary to ensure the integrity of the nuclear reactor facility by performing shielding treatments and treatments that allow thermal expansion and contraction of the piping P.

The present invention has been made against the above-mentioned background, and its purpose is to:
It is an object of the present invention to provide a method for laying piping in a nuclear reactor building, which can easily carry out the shielding treatment of the penetration parts and the treatment of allowing thermal expansion and contraction of the piping, and can shorten the construction period.

Hereinafter, the present invention will be explained based on process examples shown in FIGS. 2 to 4.

First, prior to installing the pipe P, a through pipe Pa is installed by penetrating the pipe P through the first shielding wall 4,
Penetration pipe Pb installed through the second shielding wall 5
and a connecting pipe Pc that connects both the through pipes Pa and Pb, and a plurality of the connecting pipes Pc are made into a unit by a support frame S.

Next, as shown in FIG. 2, the first shielding wall 4 and the second shielding wall 5 of the reactor building 1 are formed to a predetermined height, and a through pipe is installed in each of the shielding walls 4 and 5. A plurality of pairs of Pa and Pb are laid facing each other at a predetermined interval, and are subjected to shielding treatment and treatment to allow thermal expansion and contraction (for example, attachment of a bellows device).

Next, as shown in FIG. 3, a plurality of unitized connecting pipes Pc are carried between the first shielding wall 4 and the second shielding wall 5 by a crane or the like, and each Connecting pipes Pc... are aligned and fixed for each set between the installed through-pipes Pa and Pb.

Multiple connecting pipes Pc fixed in this way...
After connecting the through-pipes Pa and Pb to both ends of each of..., the through-pipes Pa and Pb are connected to the piping Pd installed inside the reactor containment vessel 3 and the piping Pe connected to external equipment... Then, as shown by the chain line in FIG.
The upper part of the shielding wall 5 is formed, and other structures of the reactor building 1 are formed, and the installation of the piping P is completed.

When the piping P is laid through the first shielding wall 4 and the second shielding wall 5 through such a process,
When installing the through pipes Pa and Pb on both shielding walls 4 and 5, the through pipes Pa and Pb can be installed individually and with a work space secured, so that the through pipes
Shielding treatment between Pa, Pb and the shielding walls 4 and 5, or treatment for allowing thermal expansion and contraction of the pipe P (for example, installation of a bellows device) can be reliably and easily performed.

In addition, when connecting multiple sets of through pipes Pa..., Pb... installed as described above, each set is
Since the connecting pipe Pc, which is made into a unit for each plurality of pipes, is carried in between the two through-pipes Pa and Pb and connected, the alignment with the plurality of through-pipes Pa, Pb, etc. is required. It can be carried out at the same time, and the connecting pipe
It can simplify the work of transporting PCs, and
The installation work of the piping P can be simplified and the construction period can be significantly shortened.

As explained above, according to the present invention, it is possible to provide a method for installing piping in a nuclear reactor building that exhibits various excellent effects.

[Brief explanation of drawings]

In the drawings, FIG. 1 is a longitudinal sectional view showing an example of a nuclear reactor structure, and FIGS. 2 to 4 are longitudinal sectional views showing examples of the process of the present invention. 1...Reactor building, 2...Reactor pressure vessel, 3
...Reactor containment vessel, 4...First shielding wall, 5...
...Second shielding wall, P, Pd, Pe...Piping, Pa, Pb
...Penetrating pipe, Pc...Connecting pipe, S...Support frame.

Claims (1)

[Claims] 1. In a piping installation method in which piping is laid through a first shielding wall and a second shielding wall of a reactor building by penetrating both said shielding walls, a plurality of through-holes are laid in each of said shielding walls. The pipes are buried so as to protrude in opposite directions, and then a connecting pipe made up of a plurality of pipes is inserted into a unit between the plurality of through pipes. A method of laying piping in a nuclear reactor building, which comprises connecting the through pipes.