JPS59133491A - Discharging tube device for main steam escape safety valve - 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 provides a relief safety valve exhaust pipe device that improves the steam release section, reduces the bubble pulsating load applied to the dry well wall, and improves the suppression pool. This invention relates to a main steam relief safety valve exhaust pipe device that allows for a compact internal arrangement.

[Prior art]

Figure 1 is a cross-sectional view of the reactor cavity of an underground nuclear power plant, Figure 2
The figure shows a cross section taken along the line AA in FIG. 1, FIG. 3 shows the main steam safety relief valve exhaust pipe device and its surroundings, and FIG. 4 shows a detailed view of the steam release conduit section of the main steam safety safety valve exhaust pipe.

In order to prevent an abnormal pressure rise in the reactor 6, a relief safety valve is installed in the main steam pipe, and its exhaust pipe 10 extends into the suppression pool 4, and the steam is discharged into the water via a steam release conduit 14. It is designed to be released.

As shown in FIG. 4, the steam discharge conduit 14 has a large number of openings, which face each other in the horizontal direction.

This structure has the disadvantage that bubble pressure pulsations are large during vapor condensation.

The repeated vibrations due to the activation of the relief safety valve during the life of the plant are 4,000 to 5,000 times, and the design conditions for the structural materials below the water surface are extremely severe due to the bubble pressure pulsations. It is necessary to soften such load conditions, increase margin for structural integrity, and reduce design conditions.

[Purpose of the invention]

The present invention eliminates the above-mentioned problems and reduces the bubble pulsating load applied to the structural members in the pool, thereby reducing the design load of the structural members in the pool. The purpose of the present invention is to provide an exhaust pipe device.

[Summary of the invention]

Regarding the main steam relief safety valve exhaust pipe, each steam release conduit section is assembled with a header underwater, and attached to the reactor containment vessel which is surrounded by solid rock. Main steam relief safety valve exhaust pipe device equipped with an outflow direction restriction plate.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings. FIG. 5 is a plan view showing one embodiment of the present invention, and FIG. 6 is a sectional view taken along line BB in FIG.

In the figure, 10 is an exhaust pipe, 11 is a header pipe that is combined in the underwater part, and 12 is a steam outflow direction restriction that is attached to the dry well wall 3 at the point where the header and the dry well wall 3 are closest. It is a board.

As shown in the figure, the main steam relief safety valve is constructed with a header 11 in the underwater part, and the header part 11 has a large number of steam release openings. It is installed in the reactor containment vessel supported by the rock, and the rock is designed to absorb the bubble pulsation load when the relief safety valve is activated and steam is released into the water. Further, a steam outflow direction restriction plate is installed at a portion where the header 11 and the dry well wall 3 are closest to each other so that the released steam does not directly collide with the dry well 3.

With the above structure, when the relief safety valve operates and steam is released into the water, the bubble pulsation load is stopped by the rock that is integrated with the reactor containment vessel, and the dry well wall 3 Due to the vapor outflow direction restriction plate 12, the vapor does not collide directly with the dry well wall. In addition, since the dry well wall 3 is circular, the header pipe is placed along the longitudinal direction of the reactor cavity, so it is separated from the dry well, so the pressure load is attenuated and the load value itself is reduced. be done.

As shown in FIG. 5, the present invention allows the suppression pool 4 to be arranged compactly, thereby improving the equipment design.

Installation and maintenance are easy. Moreover, bubble pulsation load is reduced.

〔Effect of the invention〕

Since the present invention is configured as described above, it has the following effects.

(1) The load acting on the dry well wall can be reduced.

(H) The arrangement within the suppression pool becomes compact, making design, installation, workability, etc. easier.

(＋＋＋＞ The design load of the equipment inside the containment vessel can be reduced.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the reactor cavity of an underground nuclear power plant, Figure 2
The figure is an explanatory diagram of the A-A section in Figure 1, Figure 3 is a diagram showing the main steam relief safety valve exhaust pipe system, Figure 4 is a detailed diagram of the steam release pipe section of the main steam safety safety valve exhaust pipe, FIG. 5 is a plan view showing an embodiment of the present invention, and FIG. 6 is an explanatory view of section BB in FIG. 1... Bedrock, 2... Reactor containment vessel, 3... Dry well, 4... Suppression pool, 5... Vent pipe, 6... Reactor pressure vessel, 7... Support Material, 8... Reactor cavity, 9... Relief safety valve exhaust pipe device, 10... Exhaust pipe, 11... Header pipe, 12...
...Steam outflow direction restriction plate, 13...Steam release conduit. Agent: Patent Attorney Akio Takahashi 2 illustrations, 30 grass, 4 wards, grass, S map

Claims (1)

[Scope of Claims] 1. In an underground nuclear power plant, a main steam relief safety valve exhaust pipe device in a containment vessel in which containment vessel suppression pools are arranged on both sides of a dry well; A main steam relief safety valve exhaust pipe device is installed in a reactor containment vessel whose surroundings are supported by solid rock, and is characterized by reducing the load acting on the drywell wall in relation to the bubble pulsation load when the relief safety valve is activated. 2. In claim 1, each steam discharge conduit is submerged with a header, and a steam outflow direction restriction plate is attached to the dry well wall, so that the steam outflow direction is directed toward the dry well wall. A main steam relief safety valve exhaust pipe device characterized by preventing direct collision and by arranging the header along the reactor containment vessel to make the arrangement in the multi-suppression pool compact.