JPH0216495A - Blow-out device - Google Patents

Abstract

PURPOSE:To reduce the exposure quantity to a worker caused by the maintenance of a blow-out panel by constituting the title device so that a path for communicating with a room in which a piping rupture is generated, an opening device is installed at a boundary to the outside of a building of the path, and the opening device is not installed at a boundary to other adjacent rooms. CONSTITUTION:A path 19 for allowing pressure to escape to the outside of a building 18 is allowed to communicate with a tunnel chamber 11 for vapor generated in a nuclear reactor. In the upper part of this path 19, a blow-out panel 20 being an opening device is installed. When a main vapor piping 10 is ruptured, pressure transmits through the path 19, and when pressure in the path 19 reaches prescribed pressure, the blow-out panel 20 installed in the boundary part of the inside and the outside of the building 18 is opened and the pressure is emitted directly to the outside of the building 18. Consequently, since the number of installation parts of the blow-out panel can be curtailed, the exposure quantity to a worker caused by the maintenance of the blow-out panel can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to blowout equipment for releasing pressure inside a building of a nuclear power plant, which increases due to a pipe rupture, to the outside of the building.

(Conventional technology) High-temperature, high-pressure flow in equipment, etc. that is transferred to turbine equipment! Piping is installed to enclose the body. In the unlikely event that the above-mentioned piping breaks in a nuclear power plant building, the internal pressure inside the building, especially in the room where the breakage is located, will rise, which will have a negative impact on other safety-important equipment installed in the building. There are concerns that For this reason, blowout equipment is installed to release the pressure caused by pipe rupture outside the building before it adversely affects other safety-critical equipment.

A conventional blowout equipment is shown in Fig. 2. Figure 2 is a schematic cross-sectional view of the building. A main steam pipe 1 transfers steam generated in a nuclear reactor through a main steam tunnel chamber 2 to a turbine. This main steam tunnel chamber 2 and an adjacent portion i5a in the turbine building 3 are separated by a blowout panel 4a. Here, the blowout panel refers to the chamber 5b in which a predetermined pressure has been reached, and the blowout panel 4b
separated by. The part adjacent to room 5b, ji5c,
5d, a door 7 and a hatch 8 are installed.

Blowout springs C4d are installed at the boundaries between the rooms 5a and 5d and the outside of the building 9.

When the main steam pipe 1 is ruptured and the pressure in the main steam tunnel chamber 2 increases, the pressure is transmitted to the adjacent chambers 5a and 5b, and the pressure is finally released outdoors via multiple chambers 5c and 5d. There is.

Further, each room in the building 9 may have a different radiation level. Therefore, adjacent rooms with different radiation levels usually need to be kept airtight, so the boundaries between adjacent rooms.

Blowout panels 4a and 4bt are installed that open when the pressure reaches a predetermined value.

(Problem to be solved by the invention "M") However, the conventional blowout equipment configured as described above has a large number of rooms to pass through and a large number of blowout panels to be installed, which has affected the construction period. In addition, maintenance of blowout panels installed in rooms with high radiation weight has the problem of increasing radiation exposure in proportion to the number of installation locations.Furthermore, if the radiation levels in adjacent rooms are about the same, Blowout panels are not required to maintain airtightness, but doors and hatches must be kept open at all times to ensure a pressure transmission path.Therefore, managing them is time-consuming and puts a burden on workers. In other words, when regular inspections and other work were completed, it was necessary to confirm that doors and hatches that needed to be opened were opened, and it was also necessary to install handrails, etc. in hatches that were open.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a release device that releases the pressure inside the building of a nuclear power plant, which increases due to pipe rupture, to a predetermined pressure or higher. In the blowout equipment that allows the pipe to escape to the outside of the building through a pipe, a route is installed that communicates with the room where the pipe breakage occurred, and the release device is installed at the boundary of this route with the outside of the building, and the pipe is adjacent to the room. To provide blowout equipment characterized in that the opening device is not installed at the boundary with other rooms where the blowout equipment is opened.

(Function) In equipment configured in this manner, the number of blowout panels installed can be reduced, the opening/closing management of doors and hatches can be unified, and the number of man-hours can also be reduced.

(Example) An example of the present invention will be described below with reference to FIG. Figure 1 is a schematic cross-sectional view of the building. The main steam pipe 10 transfers steam generated in the nuclear reactor to the turbine through the main steam tunnel chamber 11. This main steam tunnel chamber 11 and an adjacent chamber 13a in the turbine building 12 are separated by a wall 14a. The main steam tunnel room 11 and an adjacent room 13b in the reactor building 15 are separated by a wall 14b. A door 16 and a hatch 17 are installed between the room 13b and the adjacent parts 113c and 13d. The main steam tunnel room 11 has a path 1 for releasing pressure to the outside of the building 18.
9 are connected. This path 19 is made of concrete and has a substantially rectangular cylindrical shape, and extends to the top of the building 18. A blowout panel 20, which is an opening device, is installed above the path 19.

When the main steam pipe 10 is ruptured, the pressure is transmitted through the path 19, and when the pressure in the path 19 reaches a predetermined pressure, the pressure is transferred to the building 1.
A blowout panel 20 installed at the boundary between the inside and outside of the building 18 is opened to release pressure to the outside of the building 18.

According to this embodiment, the pressure is directly released to the outdoors through the path 19, so the pressure transmission path is simpler than in the past. Therefore, since the flow path is reduced, the pressure decreases in a short time, and it is possible to prevent other equipment important for safety from being affected.

The number of locations where blowout panels can be installed can be significantly reduced, shortening the construction period.Furthermore, the opening and closing management of doors and hatches can be unified, reducing the burden on workers.

The blowout panel is installed at a high location. However, the configuration of the present invention is not limited to the above embodiment. For example, the boundary between adjacent rooms does not need to be a wall, but may be a door, hatch, etc., as long as it can withstand the pressure when the pipe breaks.

Although the path is installed for pressure transmission, other equipment such as piping may be installed to the extent that its performance is not affected.

The route may be installed along the inside wall of the building or along the outside wall of the building. Further, the building in which the route is installed may be a nuclear reactor building or a turbine building.

〔Effect of the invention〕

According to the present invention, the number of locations where blowout panels are installed can be reduced, so the amount of radiation exposure of workers due to maintenance of blowout panels can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of blowout equipment according to the present invention, and FIG. 2 is a schematic diagram of a conventional blowout equipment. 10... Main steam piping 11... Main steam tunnel rooms 13a, 13b, 13c, 13d one room 18.
...Building 19...Route 20...Blowout panel

Claims (1)

[Claims] A path that communicates with a room where a pipe rupture occurs in a blowout facility that releases the pressure inside the building of a nuclear power plant, which increases due to a pipe rupture, to the outside of the building via a release device that releases the pressure above a predetermined pressure. and the opening device is installed at the boundary between the route and the outside of the building, and the opening device is not installed at the boundary between the room and another room adjacent to the room. Facility.