JPH035917Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" This invention relates to the structure of a pipe penetration part in a nuclear reactor containment vessel, and is particularly suitable for a structure where two or more supporting points are provided in a pipe penetration part. It is related to.

"Prior Art and its Problems" A nuclear reactor containment vessel is provided with a large number of pipes penetrating the vessel wall for connecting the reactor pressure vessel and the like to external devices.

Fig. 2 shows a conventional example of the structure of a pipe penetration part in a reactor containment vessel, in which a steel container wall 1 of the reactor containment vessel and a concrete wall 2 such as a reactor building biological shielding wall outside the vessel wall 1 are connected. Piping 3 that penetrates
The pipe 3 is supported by a penetration sleeve 6 which is inserted through a concrete sleeve 5 to form a through hole 4 in the concrete wall 2, and the support point of the pipe 3 is located outside the concrete wall 2. It has become a location.

Therefore, in the example shown in Figure 2, the piping 3 is supported in one place, requiring a design under disadvantageous conditions in terms of mechanical strength and earthquake resistance, and inevitably requiring a large supporting structure. There were problems such as formalization.

In addition, in order to support the piping 3 at two locations, for example, an appropriate support member 7 is interposed between the inner end of the penetration sleeve 6 and the piping 3, as shown by chain lines in FIG. In this case, the container wall 1 passes through the penetration sleeve 6 and the support member 7.
Since the heat transfer path between the pipe 3 and the pipe 3 becomes shorter, the heat transfer path between the pipe 3
Since heat transfer from the container wall 1 to the container wall 1 becomes frequent, problems such as thermal stress are likely to occur in structural members near the heat transfer path arise.

"Purpose of the invention and means for achieving the same" The present invention effectively solves the above problems and also achieves miniaturization of the penetration sleeve.

Support the through piping at two or more locations.

It can be used when adding a radiation shielding function to the inside of the penetration sleeve.

The purpose is to

In order to achieve the above object, the present invention provides piping that penetrates the container wall and the concrete wall outside the container wall, and also provides a penetrating pipe in which the supporting part of the piping is inserted into the through hole in the concrete wall. A penetration sleeve is provided, and a support member between the through hole and the pipe is disposed at a position spaced outward from the pipe support portion of the penetration sleeve.

"Example" Hereinafter, the structure of the piping penetration part in the reactor containment vessel of the present invention will be described with reference to FIG. In addition,
In the drawings, parts common to those of the conventional example described above are given the same reference numerals to simplify the explanation.

As shown in FIG. 1, the penetration sleeve 6 in this embodiment has a smaller dimension of protruding outward from the container wall 1 compared to the example in FIG.
Penetration hole 4 in concrete wall 2 in reactor building
Therefore, the pipe 3
The supporting point is such that the outer end of the penetration sleeve 6 is lower than the end of the concrete sleeve 5.
The layout is quite close to the inside. and,
A support member 7 for connecting the through hole 4 and the pipe 3 is disposed at a position spaced outward from the pipe support by the penetration sleeve 6. The support member 7 forms a small gap G between the pipe 3 and the concrete sleeve 5.
While allowing relative movement in the tube axis direction,
It is designed to be aligned with the anchor reinforcing bars 8 buried in the concrete wall 2.

With such a structure, heat transfer when the piping 3 is in a high temperature state is determined by the design of the length of the penetration sleeve 6, etc.
Since the length of the penetration sleeve 6 can be determined without being influenced by the length of the concrete sleeve 5, the mechanical strength is improved by improving the bending strength etc. as the dimensions of the penetration sleeve 6 are reduced. It is advantageous in this respect. Further, the support member 7 disposed to support the piping 3 can be arbitrarily selected at a position away from the support part provided by the penetration sleeve 6, as shown by the arrow in FIG. , there are fewer restrictions on the number and arrangement of the anchor reinforcing bars 8, etc.

On the other hand, as is clear from the comparison between Figures 1 and 2, the attachment points of the penetration sleeve 6 and the piping 3 are closer to the inside of the reactor containment vessel, so the penetration Lead hair (not shown) can be stuffed into the penetration sleeve 6 to provide this part with a radiation shielding function. (not shown) etc. will be attached.

"Effects of the invention" As is clear from the above explanation, the structure of the piping penetration part in the reactor containment vessel of the invention is as follows: (i) The piping that penetrates the container wall and the concrete wall outside the container wall is Since the penetration sleeve is supported by the through hole, the penetration sleeve can be easily miniaturized.

(ii) Since the support member between the through hole and the piping is arranged at a position spaced outward from the piping support part of the penetration sleeve,
The through pipe can be supported at two or more locations.

(iii) The piping support section provided by the penetration sleeve can be used as a member for holding down lead hair, etc., which is advantageous when providing a radiation shielding function to the inside of the penetration sleeve.

(iv) Cost reduction can be achieved by downsizing the piping penetration part.

It has excellent effects such as:

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an example of the structure of a pipe penetration part in a reactor containment vessel according to the present invention, and FIG. 2 is a longitudinal sectional view showing a conventional example thereof. 1...Container wall, 2...Concrete wall, 3...
Piping, 4... Through hole, 5... Concrete sleeve, 6... Penetration sleeve, 7... Support member, 8... Anchor reinforcing bar, G... Booth.

Claims (1)

[Scope of utility model registration request] In addition to providing piping that penetrates the container wall and the concrete wall outside of the container wall, a penetration sleeve is provided in the container wall with a support portion of the piping inserted into a through hole in the concrete wall, and the penetration sleeve A structure of a pipe penetration part in a nuclear reactor containment vessel, characterized in that a support member between the through hole and the pipe is arranged at a position spaced outward from the pipe support part.