JPS6159285A - Method of installing control-rod driving-mechanism containing housing and inernal structure at fixed position - 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] [Field of Application of the Invention] The present invention relates to a method for fixing a control rod drive mechanism housing housing of a boiling water reactor in a fixed position to a structure housed therein, and particularly to a housing structure for housing a control rod drive mechanism of a boiling water reactor. It relates to a mounting method suitable for cases in which the device has a yonet socket or the like on the top of the device and its mounting position is limited.

[Prior art]

In a conventional boiling water reactor, as shown in FIGS. 1 and 2, a control rod guide tube 2 is attached to the top of a control rod drive mechanism storage housing 1. In order to prevent the control rod guide tube 2 from floating up, its lower end 2a is fitted with the tip of an internal structure 3 which is mounted downwardly in the housing 1 in a so-called bayonet socket manner. Since the internal structure 3 has a long total length of approximately 4 m, accurate positioning is required when inserting it into the housing housing 1, and if the internal structure 3 is misaligned, the control rod guide tube 2 may be pushed up.

In the conventional example, the internal structure 3 is a structure called a thermal sleeve, and in a new boiling water reactor, the control rod drive mechanism body falls into this structure.

[Purpose of the invention]

The present invention has been made in view of the above points, and an object of the present invention is to easily and accurately determine the insertion position without pushing up the control rod guide tube when inserting the internal structure into the storage housing. The object of the present invention is to provide a control rod drive mechanism storage housing and a method for mounting an internal structure in a fixed position.

[Summary of the invention]

The present invention provides a protrusion on the outer wall of an internal structure such as a control rod drive mechanism of a boiling water reactor, and further forms a groove on the inner wall of a storage housing that accommodates the internal structure opposite to the protrusion. The intended purpose is achieved by making it possible to attach the internal structure to the storage housing only at the position where the protrusion and the groove fit together.

Therefore, even if directionality is required using a back-net socket formed at the tip of an internal structure, it can be easily installed in a fixed position by determining the position of the protrusion and groove to match that direction. becomes.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
The same parts as those shown in the conventional example of FIG. 2 and FIG. 2 are indicated by the same symbol. FIG. 3 shows an example in which the internal structure 3 attached to the storage housing l is a thermal sleeve in a conventional boiling water reactor, and FIG. 4 shows the storage housing in this embodiment. 1 shows a cross section of the lower part of No. 1.

A T-shaped groove 1a is formed in the inner wall at the lower end of the storage housing 1, and an axial groove of the groove 1a reaches the opening at the lower end of the storage housing 1. A protrusion W3a that fits into the groove 1a is formed on the outer wall of the one-way structure 3. In addition, a control rod guide tube 2 is provided at the top of this internal structure 3.
A notch 2b formed at the lower end 2a of the control rod guide tube 2 and an upper end 3 of the internal structure 3 are provided.
The protrusion 3C formed in b is fitted into the protrusion 3C.

In one embodiment of the present invention configured as described above, when the internal structure 3 is to be attached to the storage housing 1, it can be attached only when the protrusion 3a is aligned with the groove 1a. By aligning the positions of the protrusion 3a and the groove 1a with the fitting position of the lower part 2a of the control rod guide tube 2 and the upper part 3b of the internal structure 3, the upper part can be fitted and installed reliably. After inserting the internal structure 3 into the storage housing 1 in this way,
By rotating the internal structure 3 along the circumferential groove of the groove 1a, the lower end 2a of the control rod guide tube 2 and the upper end 3b of the internal structure 3 can be connected.

Note that the circumferential groove of the groove 1a is formed in the internal structure 3 as shown in the figure.
The object of the present invention can be achieved even if it is stopped at a position that ensures the required rotation angle, or even if it is provided continuously over the entire circumference.

FIG. 5 shows another embodiment of the present invention, in which an inverted groove 1b is formed in the inner wall of the storage housing 1.

This example is particularly effective when it is desired to restrict the rotational direction of the internal structure 3 after it is inserted into the storage housing 1.

〔Effect of the invention〕

As described above, according to the present invention, the insertion position of the internal structure installed in the control rod drive mechanism storage housing is not constant;
The effect is great because the upper part of the internal structure can now be reliably connected.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing a conventional control rod drive mechanism storage housing and its related structure, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 3 is a partial view showing an embodiment of the present invention. FIG. 4 is a cross-sectional view showing the lower part of the storage nozzle in FIG. 3, and the fifth factor is a perspective view showing another embodiment of the present invention. 1...Control rod drive mechanism storage housing, 1a...1
character-shaped groove, 1b... inverted-shaped groove, 2... control rod guide tube,
3... Internal structure, 3a... Projection.

Claims (1)

[Claims] 1. In the method for installing the internal structure of the control rod drive mechanism storage housing in a fixed position of the control rod drive mechanism storage housing and the internal structure of a boiling water reactor, a T-shaped a groove is formed, an axial portion of this groove reaches the lower end surface opening of the control rod drive mechanism housing housing, and the T-shaped groove is fitted into an outer wall of a structure to be housed inside the housing. 1. A method for attaching a control rod drive mechanism storage housing and an internal structure in a fixed position, characterized in that the structure is provided with a flexible protrusion, and the structure can be attached only at a position where the groove and the protrusion fit together.