JPH0377097A - Blow out panel device - Google Patents

Abstract

PURPOSE:To suppress the outflow rate of steam by providing a supporting means which parts the blow out panel mounted in the aperture on the side wall of the building of an nuclear power plant or resetting the same from and to the outside surface of the side wall when the inside pressure in the building attains a set value. CONSTITUTION:A hanger arm 9 is projected to the blow out panel 3 from the outside surface of the building and the front end of this arm 9 is movably engaged with a rail 10 installed on a downward grade toward the aperture 2. A buffer device 12 is provided on the inside surface of the side wall of a duct 11 opposite to the base end of the arm 9. The panel 3 is rapidly moved along the rail 10 when the internal pressure acts. The device 12 receives the impact acting on the panel 3 by receiving this pressure and to prevent the failure of the panel. The panel 3 descends along the rail 10 and comes into contact with the outer side of the aperture 2 when the internal pressure in the building B attains the specified threshold or below. The aperture 2 is nearly closed from the outer side thereof in this way and the steam outflow from the aperture 2 is limited.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a blowout panel device in a nuclear power plant.

(Conventional Technique #I) In order to deal with the rise in pressure inside the building when a main steam pipe ruptures, the building of a nuclear power plant is opened due to the rise in internal pressure, and the rise in internal pressure causes the reactor pressure vessel, other equipment, and the building itself to be opened. A blowout panel device is provided to reduce the impact on FIG. 3 is a diagram showing the position where the blowout panel device is installed, and FIG. 4 is a diagram showing the structure of the conventional blowout panel device.

As shown in FIG. 3, the blowout panel device is installed on the side wall of the top floor of nuclear power plant building B at a location indicated by reference numeral 1 in the figure. As shown in Figure 4, nuclear power plant building B
An opening 2 is provided in the side wall of the blowout panel 3, and a blowout panel 3 is provided to close the opening 2. That is, an opening frame 4 on a frame is attached to the inner surface of the opening 2, and a frame-shaped stop plate 5 is attached to the inner periphery of this opening frame, which has a protrusion that reduces the opening cross section toward the outside of the building B. It is being On the other hand, the blowout panel 3 has a first bent part 3a with a deep U-shaped cross section on its periphery, and a second bent part 3a with a shallow U-shaped cross section in the opposite direction at the tip edge of this bent part. Bending part 3
6 The blowout panel 3 having the above configuration includes:
The tip of the second bent portion 3b is brought into contact with the inner surface of the tip of the protruding portion of the stop plate 5, and the backing seal 6 is interposed between the opening frame 4 and the first bent portion 3a to close the opening frame. It is attached to 4. Note that 7 in this figure is attached to the inner surface of the lower part of the opening, and is attached to the bent portion 3a of the blowout panel 3.
The sled that abuts and supports the lower surface is shown, and the arrow 8 shows the building pressure acting on the blowout panel 3. Furthermore, although not shown in the drawings, the blowout panel 3 is suspended from the building frame by a chain or the like.

In the conventional blowout panel 3 having the above configuration, when the building pressure 8 rises and reaches a certain limit, the stop plate 5 is deformed by the pressure load acting on the blowout panel 3, and the retaining force against the blowout panel 3 is reduced. The blowout panel 3 is removed from the opening frame 4 and the blowout panel 3 is removed from the opening 2.
will be released.

This releases the internal pressure inside the nuclear power plant building.

In addition, since the blowout panel 3 is assembled and supported from the building frame by supporting means such as chains as described above, it will not fall when the opening 2 is opened.

(Problems to be Solved by the Invention) In the conventional blowout panel device having the above configuration, once it is activated, it is necessary to restore the current state by some means, and until this restoration, main steam is not supplied from the opening. As emissions continue, the pollution of the environment cannot be ignored.

The present invention has been made based on the above-mentioned circumstances, and provides a blowout panel device that automatically closes the opening of a building when the opening of the building is opened due to a predetermined internal pressure and then the internal pressure of the building decreases to a certain limit. The purpose is to

[Structure of the Invention] (Means for Solving the Problem) The blowout panel device of the present invention is attached to an opening in the side wall of the nuclear power plant building by a stop plate that is deformed when the internal pressure inside the building reaches a predetermined value. with a blowout panel,
The blowout panel is characterized by comprising support means for guiding the blowout panel in a direction away from the outer surface of the side wall when the stop plate is deformed and returning it to the original position after the internal pressure has decreased.

(Function) In the blowout panel device of the present invention having the above configuration,
When the pressure inside the building increases, the blowout panel deforms the stop plate and moves to open the opening, allowing steam inside the building to flow out and lowering the internal pressure. Further, when the internal pressure is reduced to a certain value, the blowout panel is returned to its original position by the support means, substantially closing the opening and restricting the outflow of steam.

(Embodiment) FIG. 1, in which the same parts as in FIG. 4 are denoted by the same reference numerals, is a side view of an embodiment of the present invention shown together with a cut away nuclear power building. In this figure, a hanger arm 9 is projected from the outside of the building on the blowout panel 3, and the tip of the hanger arm is movably engaged with a rail 1° installed on a downward slope toward the opening 2. . That is, the hanger arm 9 and the rail 10 constitute support means for the blowout panel. Note that the rail 10 is fixed to the inner surface of the upper end of a duct 11 that guides steam leaked when the main steam pipe ruptures. Further, a shock absorber 12 is provided on the inner surface of the side wall of the duct 11, facing the base end of the hanger arm 9. In the blowout panel device of the present invention having the above structure, when the internal pressure 8 acting on the blowout panel 3 becomes larger than the constant pressure regulated by the stop plate 5, the blowout panel 3 moves to the stop plate 5. It resists the supporting force of the building B, deforms it, and is blown out of the building B as shown by the arrow 13 in the figure.

Therefore, in the blowout panel device of the present invention,
Since the tip of the hanger arm 9 of the blowout panel 3 is movably engaged with the rail 10, the blowout panel 3 is rapidly moved along the rail 10 when the internal pressure is applied.

The buffer bag [12] cushions the impact acting on the blowout panel and prevents its damage.

The blowout panel 3 with the opening 2 opened as described above is about to move toward the opening 2 due to the downward slope of the rail 10. Therefore, if the internal pressure in the building B falls below a certain limit, it will descend along the rail 1o and come into contact with the outside of the opening 2.

As a result, the opening 2 is substantially closed from the outside, and the outflow of steam from the opening 2 is restricted.

With the above outflow restricted, appropriate measures are taken against the main steam pipe rupture, the stop plate 5 is replaced, and the blowout panel device is restored to full silkworm status.

In other words, in the conventional blowout panel device,
The opening 2 was fully opened until the measures against the main steam pipe rupture were completed and the blowout panel device was completely restored, and the outflow of steam was not restricted in any way. The outflow of steam is restricted even in the front.

FIG. 2, in which the same parts as in FIG. 1 are given the same reference numerals, shows another embodiment of the present invention. In this figure.

A stop plate 5 that engages with the opening frame 4 to orient the blowout panel 3 is fixed to the blowout panel 3 side.

Further, two hanger arms are attached to both upper ends of the outer surface of the blowout panel 3 (the outer surface of the building B). The upper ends of these hanger arms project upward from the upper end of the blowout panel 3. A shaft 22 provided at the upper end of each hanger arm 21 in parallel to the side wall is engaged with a long hole 24 provided in a bracket 23 protruding from the outer surface of the side wall of the building iB and inclined downward toward the outer surface of the side wall. The blowout panel 3 is engaged with the bracket 23 so that it can move laterally along the elongated hole 24 and rotate about the shaft 22. That is, the hanger arm 21 and the bracket 23 constitute support means for the blowout panel 3.

In the embodiment with the above configuration, when the building pressure 8 becomes greater than the constant value defined by the stop plate 5.

The blowout panel 3 deforms the stop plate 5 due to the load applied thereto, and as shown by the arrow 25 in the drawing,
It is laterally driven outwards and then pivoted about axis 22 as indicated by arrow 26 to open aperture 2.

This reduces the internal pressure within the building in the same manner as in the embodiment described above.

Further, when the internal pressure inside the building B decreases, the blowout panel 3 closes the opening 2 by following the reverse process as described above. In this embodiment as well, the same restriction of vapor outflow as in the previously described embodiment is automatically achieved.

[Effects of the Invention] As is clear from the above, in the blowout panel device of the present invention, when the pressure inside the building rises due to a rupture of the main steam pipe, the blowout panel deforms the stop plate attached to the opening frame due to the pressure inside the building. Driven by the internal pressure, an opening in the side wall of the building is opened to release leaked steam outside the building, and when the internal pressure drops to a certain value, the opening is automatically closed to restrict the outflow of steam.

Therefore, if the stop plate is replaced after taking appropriate measures against a main steam pipe rupture, the blowout panel device will be completely restored and the opening will be completely closed.

Therefore, the amount of steam rising and flowing into the building until the blowout panel device is completely restored can be minimized, and environmental pollution can be kept to a minimum.

[Brief explanation of drawings]

FIG. 1 is a side view of one embodiment of the invention shown with a cut away nuclear power building; FIG. 2 is a similar view to the previous view of another embodiment of the invention; FIG. FIG. 4 is a sectional view showing the structure of a conventional blowout panel device. B...Nuclear power plant building 1...Blowout panel device installation location 2...Opening
3... Blowout panel 4... Opening frame 5... Stop plate 6... Backing seal 7... Sled 8...・Internal pressure 9.
21...Hanger arm 10...Rail 11...Duct side wall 12...Buffer device 13゜25.26...Arrow mark 22.・
...Shaft 23...Bracket 24...
...long hole

Claims (1)

[Claims] A blowout panel is attached to the opening in the side wall of the building by a stop plate that is deformed when the internal pressure inside the nuclear power plant building reaches a predetermined value, and the blowout panel is separated from the outer surface of the side wall when the stop plate is deformed. A blowout panel device comprising support means for guiding the blowout panel in the direction and returning it to the original position after the internal pressure has decreased.