JPS63193093A - Waste-liquor collecting facility for nuclear power plant - 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] [Industrial Application Field] The present invention relates to the improvement of waste treatment equipment in nuclear power plants, and in particular, when the water seal section runs out of water, the waste liquid is This invention relates to waste treatment equipment that prevents backflow of air from a receiver.

[Conventional technology]

In a nuclear power plant, waste liquid generated from various parts of the power plant is received in waste liquid receivers provided on each floor, and is collected in a waste liquid tank through drain piping.

Water seals are installed in these waste liquid receivers so that air between adjacent areas flows through the drain pipes and prevents radioactive waste from dispersing. However, the capacity of the water seals is small and the waste evaporates in a short period of time. , the water will run out and no longer function as a water seal, so it is necessary to periodically replenish water into the waste liquid receiver, which has the disadvantage of requiring a great deal of labor to replenish water into the numerous waste liquid receivers in a nuclear power plant. Ta.

In addition, Japanese Patent Laid-Open Nos. 52-156294 and 57-10499 are examples of devices that prevent waste liquid from adjacent areas from flowing backward through drain pipes, but these inventions prevent the backflow of air in a drained state. could not be prevented.

[Problem that the invention seeks to solve]

In the conventional technology described above, in order to maintain airtightness between each room in a nuclear power plant and to prevent backflow of air from the floor muscle liquid receiver, it is necessary to maintain seal water at an appropriate level at all times. When the water becomes below the water-sealable level due to evaporation, etc., the difference in air pressure between the partitioned rooms causes the air to flow back through the drain pipe to the waste liquid receiver in the adjacent room where the air pressure is lower.
If it blows out onto the floor, it will be contaminated by air containing radioactive substances from adjacent rooms or by radioactive waste in the drain pipes, causing safety management problems. It is necessary to prevent air from flowing in.

An object of the present invention is to provide a floor socket that can prevent backflow of air when the seal water in the floor fluid receiver installed on the floor of a nuclear power plant building evaporates and no longer functions as a sealing mechanism. It is in.

[Means for solving problems]

The purpose of the above is that when the seal water in the water seal evaporates, the waste liquid receiver installed on the floor of the nuclear power plant moves the waste liquid between adjacent rooms from the room with high air pressure to the room with low air pressure.
By using a sealing member with a structure that can only block the flow of air that flows backwards due to differential pressure through the drain pipe, even if the water seal of the waste liquid receiver runs out, the water can be passed through the drain pipe of the waste liquid collection equipment. Prevent the spread of radioactive waste between areas.

[Effect]

Seal water in the water seal part of the waste liquid receiver When the water runs out, the air flowing through the drain pipe due to the difference in air pressure between adjacent areas flows between the inner and outer cylindrical members that make up the water seal part of the waste liquid receiver. A sealing member placed at a position blocking the flow between the cylinders blocks air flowing back.

On the other hand, for waste liquid flowing into the waste liquid receiver, the tip of the sealing member is bent by the water pressure of the liquid accumulated in the waste liquid receiver, and operates to allow the waste liquid to flow easily.
The waste liquid receiver drains waste liquid and blocks air flowing back due to pressure differences from other areas to prevent the spread of contamination.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 shows the structure of the floor fluid receiver in a state where the sealing water has evaporated below the water sealing level, and a perforated plate 6 is installed at the top to prevent large particles from getting mixed in. Inside the waste liquid receiver 1, an outer cylindrical part 3 and a rising inner cylindrical part 2 are installed inside the drain pipe floor muscle liquid receiver to provide a water sealing function. Here, in order to prevent backflow from the drain pipe when the waste liquid (seal water) 7 drops below the seal water level,
A seal member 5 is attached to the inner cylindrical portion 2 and fixed by a seal member outer work 4. The sealing member 5 is pressed against the outer cylindrical part by the pressure of the air pressure to prevent the backflow of air from the drain pipe.

Fig. 2 shows the state of the seal part when waste liquid flows into the floor streak liquid receiver, and a gap is created between the seal member 5, which easily bends due to the water pressure of the waste liquid (seal water) 7, and the outer cylindrical part 3. ,
Drain the waste liquid (seal water) 7.

FIG. 3 shows an example of the arrangement of the floor fluid receiver 1 and the drain pipe 8 with respect to the building frame 9. The pipe head in which the waste liquid (seal water) 7 in FIGS. 1 and 2 has fallen below the seal water level,
This indicates that air moves through the drain pipe 8 due to the pressure difference between each room.

In order for the sealing mechanism of the present invention to function effectively, the sealing member 5 and the outer cylindrical portion 3 must be kept under low pressure at all times in order to prevent air movement even when the pressure difference between rooms is small. It is necessary to crimp it, but for position adjustment,
Outer cylindrical part 3. Seal member frame 4. By matching the sizes of the seal members 5, individual fine adjustments are not required.

According to this embodiment, even if the water sealing function is no longer fulfilled due to evaporation of the sealing water or the like, the air backflow prevention function can be provided regardless of the presence or absence of the sealing water.

In the present invention, the structure and mounting position of the seal part do not necessarily have to be as shown in FIGS. The shape and attachment position may be changed, such as attachment to No. 3.

〔Effect of the invention〕

According to the present invention, by using a sealing member that can block air of low pressure that flows backward, it is possible to prevent contamination from spreading due to air from an adjacent area even when the water seal part runs out of water.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the water seal part of the floor waste liquid receiver according to an embodiment of the present invention when water is drained, Figure 2 is a sectional view of the floor waste liquid receiver of Figure 1 when waste liquid is flowing in, and Figure 3 is FIG. 3 is a cross-sectional view of the building showing a drain pipe connecting a floor waste liquid receiver and an adjacent room. DESCRIPTION OF SYMBOLS 1... Floor waste liquid receiver, 2... Inner cylindrical part, 3... Outer cylindrical part, 4... Seal member outer wadding, 5... Seal member.

Claims (1)

[Claims] 1. Waste liquid collection at a nuclear power plant, characterized in that a sealing member is attached to the waste liquid receiver provided on the floor of the nuclear power plant to prevent backflow of air from the adjacent area through the drain pipe connecting the waste liquid tank. Facility.