JP2590238B2 - Reactor containment vessel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a reactor containment vessel used for a boiling water reactor.

(Prior Art) Hereinafter, an outline of a conventional reactor containment vessel will be described with reference to FIG.

The reactor containment vessel (hereinafter abbreviated as PCV) 1 has a reactor pressure vessel (hereinafter abbreviated as RPV) 2 and four dry wells (hereinafter abbreviated as D / W) containing pipes 3 connected to it and an accident. Sometimes the energy of the steam released into the D / W4 is
It consists of 5 parts of a wet well (hereinafter abbreviated as W / W) storing pool water absorbed through the water.

This D / W4 part and W / W5 part are used for the reactor pressure vessel
V pedestal) 6 and diaphragm floor (hereinafter D
/ F).

The D / W 4 has an upper dry well (hereinafter abbreviated as U / D) 4a containing main steam piping and the like, and a lower dry well (hereinafter L / D) containing a control rod drive mechanism (not shown) and the like. (Abbreviated) 4
The U / D 4a and L / D 4b are connected by a D / W communication hole 8.

Here, the drain generated by the valve 9 installed in the pipe 3 connected to the RPV 2 is routed on the D / F 7 in the U / D 4a,
It is guided to the sump 11 by the drain line 10 routed into the L / D 4b through the / W communication hole 8.

(Problems to be Solved by the Invention) As described above, the drain line 10 routed from the outer peripheral portion of the L / D 4a to the D / W communication hole 8 crosses the access route on the D / F 7 to impair accessibility. There was a need for improvement.

An object of the present invention is to provide a PCV capable of improving the accessibility on a D / F and improving the workability of a drain line.
Is to get

[Configuration of the invention]

(Means for Solving the Problems) In order to achieve the above object, in the present invention, RPV
D / W to store the water, W / W to contain the pool water, and this W / W
And a D / F separating the D / W, wherein the W / W
A drain line for treating drain generated by the U / D formed above the D / F is arranged in the W / W through the D / F, and then the L / D formed below the RPV is disposed. A PCV characterized by being guided to a sump disposed in a PCV.

(Operation) In the PCV configured as described above, since there is no drain line separating the access route on the D / F floor, the accessibility on the D / F floor is improved. In addition, compared to U / D that is crowded with main piping, cables, air conditioning ducts, etc., W
Since the volume in / W is small, the workability of drain piping is improved.

(Example) Hereinafter, a PCV1 according to an example of the present invention will be described with reference to FIG.
3 is explained. In FIG. 1, the same portions as those in FIG. 2 are denoted by the same reference numerals, and the description of the configuration of the portions will be omitted.

Pipe 3 routed in U / D4a in the present invention
The drain generated by the valve 9 disposed in the D / F 7 passes through the D / F 7, passes through the W / W 5, reaches the D / W communication hole 8, and is transmitted to the sump 11 by the drain line 14 routed in the L / D 4 b. Be guided.

With the above configuration, the drain line on the D / F 7 in the U / D 4a has been eliminated. Therefore, the access route is not divided by the drain line, and the accessibility on the D / F floor can be improved.

〔The invention's effect〕

As described above, according to the PCV according to the present invention, the D / F in the U / D
By routing the drain line that was routed above in the W / W, the access route is not divided by the drain line, and the accessibility on the D / F floor can be improved.

In addition, since the physical quantity is smaller in the W / W than in the U / D, the workability of the drain line can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a containment vessel showing an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view showing a conventional example of a containment vessel. 1,13 Reactor containment vessel (PCV) 2 Reactor pressure vessel (RPV) 3 Piping 4 Dry well (D / W) 4a Upper dry well (U / D) 4b Lower dry well (L / D) 5 Wet well (W / W) 6 RPV pedestal 7 Diaphragm floor (D / F) 8 D / W communication hole 9 Valve 10 and 14 Drain line 11 …… Sump 12 …… Vent pipe

Claims (1)

(57) [Claims] 1. A reactor containment vessel comprising a dry well for storing a reactor pressure vessel, a wet well for containing pool water, and a diaphragm floor separating said wet well and said dry well. A drain line for treating drain generated in the upper dry well formed in the wet well is pierced through the diaphragm floor and then disposed in the lower dry well formed below the reactor pressure vessel. A reactor containment vessel characterized by being guided to an installed sump.