CN211315793U

CN211315793U - Emergency air source box for water gate of nuclear power station refueling pool

Info

Publication number: CN211315793U
Application number: CN201921971763.5U
Authority: CN
Inventors: 王宗魁; 朱彩军; 何家欢; 刘强; 岳兴华; 鲍旭东
Original assignee: CNNC Nuclear Power Operation Management Co Ltd; Qinshan Nuclear Power Co Ltd
Current assignee: CNNC Nuclear Power Operation Management Co Ltd; Qinshan Nuclear Power Co Ltd
Priority date: 2019-11-14
Filing date: 2019-11-14
Publication date: 2020-08-21
Anticipated expiration: 2029-11-14

Abstract

The utility model belongs to the equipment machinery field, concretely relates to emergent air supply case of nuclear power station pond sluice gate of reloading. When the maintenance pressure space of the sealing gasket of the water gate is failed or the gas supply is not smooth, the sealing performance of the water gate is affected, and the radioactive water of the component pool is leaked to the side of the reactor pool. In the device, an air inlet pipe, a compressed air source isolation valve, an air source one-way valve and one end of a tee joint are sequentially connected through a pipeline; the pressure reducing valve is connected with one end of the tee joint and the rear check valve of the pressure reducing valve through a pipeline; the exhaust pipe and the exhaust pipe isolation valve are connected through a pipeline. This set of device changes the air feed air supply of reloading pond sluice gate into double-source air feed by single air supply, and dual air feed has increased the sealed reliability of sluice gate for when normally killing out trouble or the air feed is not smooth, reserve emergent air supply can be air feed at once, has effectively avoided single trouble, has reduced the operation risk.

Description

Emergency air source box for water gate of nuclear power station refueling pool

Technical Field

The utility model belongs to the equipment machinery field, concretely relates to emergent air supply case of nuclear power station pond sluice gate of reloading.

Background

The water gate of the refueling water pool is arranged in a channel between the component pool and the reactor pool, so that the component pool and the reactor pool can be separated, sealing is realized, and the whole refueling water pool is divided into two parts. The water gate sealing performance is guaranteed by inflatable seal gasket. The service air compression system provides compressed air for inflating the sealing gasket.

After the water gate is installed, the reactor pool can be drained independently, and the component pool still keeps a water filling state, so that the reactor pool side can be maintained independently. Under the low water level working condition, a maintainer directly enters the bottom of a reactor water tank to inspect the flange surface and the main bolt hole of the pressure vessel, and measures, records and repairs defects. The water gate of the refueling water tank can realize the sealing of the component tank and the reactor water tank after being arranged in a channel between the component tank and the reactor water tank, the reactor water tank can drain water so as to carry out low-water-level maintenance work during the low water level of the pressure vessel, and the component tank can be kept in a full water state so as to shield the radioactive dose of the upper reactor internal component and the reactor nuclear measuring instrument.

When the maintenance pressure space of the sealing gasket of the water gate is failed or the gas supply is not smooth, the sealing performance of the water gate is affected, the radioactive water of the component pool is leaked to the side of the reactor pool, and the personal safety of maintenance personnel in the reactor pool is seriously threatened.

Therefore, the emergency air source box for the water gate of the refueling water pool of the nuclear power station is urgently needed to be invented, and a spare air source is added, so that when the normal pressure air fails or the air supply is not smooth, the spare emergency air source can supply air immediately, and the water gate of a reactor factory building is prevented from leaking to influence the normal maintenance work.

Disclosure of Invention

1. The purpose is as follows:

the purpose of this patent is in order to design an emergent air supply case for nuclear power station reloading pond sluice gate to guarantee that the sealed pad that the emergent air supply can supply with the sluice gate when normal air feed loses, with a device that maintains its sluice gate is sealed.

2. The technical scheme is as follows:

an air inlet pipe, a compressed air source isolation valve and an air source check valve are sequentially connected through a pipeline; the pressure reducing valve is connected with the air source one-way valve and the rear one-way valve of the pressure reducing valve through pipelines; the exhaust pipe and the exhaust pipe isolation valve are connected through a pipeline.

The other end of the air source one-way valve is connected with an emergency air supply pipeline one-way valve through a pipeline, the other end of the emergency air supply pipeline one-way valve is connected with an air supply pipeline isolation valve through a pipeline, and the other end of the air supply pipeline isolation valve is connected with an emergency air supply air inlet pipe.

The other end of the check valve behind the pressure reducing valve is connected with one end of the seal air inlet isolation valve through a pipeline, and the other end of the seal air inlet isolation valve is connected with the air outlet pipe through a pipeline.

The other end of the exhaust pipe isolation valve is connected with the exhaust pipe through a pipeline.

And the two ends of the sealing gasket air inlet isolating valve are connected with an air pressure meter and a sealing pressure meter in parallel.

The air outlet pipe is connected with a water gate sealing gasket air supply pipe through a hard pipeline.

The air inlet pipe is connected with an emergency air source nitrogen cylinder through a hard pipeline arrangement.

3. The effect is as follows:

this set of device changes the air feed air supply of reloading pond sluice gate into double-source air feed by single air supply, and double air feed has increased the sealed reliability of sluice gate, compares in the single air feed in compressed air source before, through the emergent air supply case of design, increases emergent air supply all the way for when normally compressed air breaks down or the air feed is not smooth, reserve emergent air supply can be air feed at once, has effectively avoided single trouble, has reduced the operation risk.

Drawings

FIG. 1: emergency air source box internal structure diagram of water gate of refueling pool

In the figure: 1. an air inlet pipe; 2. an emergency air supply and inlet pipe; 3. an exhaust pipe; 4. an air outlet pipe; 5. a compressed air source isolation valve; 6. a compressed air source pressure reducing valve; 7. a rear check valve of the pressure reducing valve; 8. an emergency air supply pipeline one-way valve; 9. an exhaust pipe isolation valve; 10. a gas supply line isolation valve; 11. a seal air inlet isolation valve; 12. a gas pressure gauge; 13. sealing a pressure gauge; 14. an air source check valve; 15. and a tee joint.

Detailed Description

The utility model relates to a nuclear power station pond sluice gate emergency air source case of reloading. As shown in fig. 1, it is mainly composed of an air supply and exhaust pipe, an exhaust pipe isolation valve, an air source check valve, a compressed air source pressure reducing valve, a pressure sealing gauge, etc. The whole device is arranged in a cuboid box and can be made into a standard part. Intake pipe 1 connects nuclear power plant through hard pipeline and overhauls with normal air supply source of supplying pressure, and emergent air feed intake pipe 2 passes through hard pipeline arrangement and connects on emergent air supply nitrogen cylinder, and the sealed air supply pipe that fills up of outlet duct 4 through hard pipeline connection sluice gate, 3 air-out pipes to empty. Under normal conditions, a compressed air source for maintenance of a nuclear power plant is used for reducing the pressure to 0.22MPa through an air inlet pipe 1, a compressed air source isolation valve 5, a one-way valve 14 and a tee joint 15 by a compressed air source pressure reducing valve 6, and then the pressure is supplied to a water gate sealing gasket through a pressure reducing valve rear one-way valve 7 and a sealing gasket air inlet isolation valve 11; the emergency air supply pipeline one-way valve 8 prevents air from leaking to the emergency air source side during normal air supply. When the pressure air source for maintenance fails, the emergency air source supplies pressure to the water gate sealing gasket through the air inlet pipe 2, the air supply pipeline isolation valve 10, the emergency air supply pipeline one-way valve 8, the tee joint 15, the pressure reducing valve 6 and the pressure reducing valve 6 to 0.22MPa, the pressure reducing valve 7 and the sealing gasket air inlet isolation valve 11; the air supply check valve 14 prevents blow-by of the emergency air supply to the fault air supply side. After the intake valve 11 is closed, the air pressure gauge 12 and the seal pressure gauge 13 display the intake pressure and the seal pressure, respectively. When the water gate sealing gasket needs to exhaust, the exhaust pipe isolation valve 9 is opened to exhaust after the air inlet valve 11 is closed.

According to the scheme shown in the figure 1, an air inlet pipe 1 of an emergency air source box is connected with a compressed air source for maintenance through a hard pipeline, an air inlet pipe 2 of the emergency air source box is arranged and connected on an emergency air source nitrogen cylinder through the hard pipeline, an air outlet pipe 4 of the emergency air source box is connected with an air supply pipe of a water gate sealing gasket through the hard pipeline, and an air outlet pipe 3 of the emergency air source box is empty;

closing an exhaust pipe isolation valve 9, an air supply pipeline isolation valve 10 and a seal pad air inlet isolation valve 11, opening a compressed air source isolation valve 5, adjusting the pressure of a pressure reducing valve to 0.22MPa through the compressed air source and locking, and checking whether leakage exists in each joint from an emergency air source box to the compressed air source pipeline;

closing the isolation valve 5 of the emergency gas source box, the isolation valve 9 of the exhaust pipe and the seal pad gas inlet isolation valve 11, opening an emergency gas source nitrogen cylinder, opening the isolation valve 10 of the gas supply pipeline, and checking whether leakage exists from each joint on the pipeline from the emergency gas source box to the emergency gas source nitrogen cylinder;

confirming that an exhaust valve 9 of a water gate air source box is closed, opening an air supply valve 5 of an emergency air source box and an exhaust pipe isolation valve 9, and checking whether leakage exists at each joint on a pipeline from the emergency air source box to the water gate air source box;

closing the main air supply valve 5 of the external air source (the pressure regulating valve keeps the current state unchanged), and opening the air supply line isolation valve 10, the seal cushion air inlet isolation valve 11 and the exhaust isolation valve 9 to ensure the smoothness of the exhaust line of the water gate air source box; and completing the test of the emergency air source box.

Claims

1. The utility model provides a nuclear power station pond sluice gate emergency air source case that reloads which characterized in that: one ends of the air inlet pipe (1), the compressed air source isolating valve (5), the air source one-way valve (14) and the tee joint (15) are sequentially connected through a pipeline; the pressure reducing valve (6) is connected with one end of the tee joint (15) and the rear check valve (7) of the pressure reducing valve through a pipeline; the exhaust pipe (3) is connected with the exhaust pipe isolation valve (9) through a pipeline.

2. The emergency air source box of the water gate of the refueling pool of the nuclear power plant as recited in claim 1, characterized in that: the other end of tee bend (15) pass through pipe connection emergency air supply line check valve (8), emergency air supply line check valve (8) other end passes through pipe connection air supply line isolation valve (10), emergent air feed intake pipe (2) is connected to air supply line isolation valve (10) other end.

3. The emergency air source box of the water gate of the refueling pool of the nuclear power plant as recited in claim 1, characterized in that: the other end of the back check valve (7) of the pressure reducing valve is connected with one end of the sealing pad air inlet isolating valve (11) through a pipeline, and the other end of the sealing pad air inlet isolating valve (11) is connected with the air outlet pipe (4) through a pipeline.

4. The emergency air source box of the water gate of the refueling pool of the nuclear power plant as recited in claim 1, characterized in that: the other end of the exhaust pipe isolation valve (9) is connected with the air outlet pipe (4) through a pipeline.

5. The emergency air source box of the water gate of the refueling pool of the nuclear power plant as claimed in claim 3, wherein: and two ends of the sealing gasket air inlet isolating valve (11) are connected with an air pressure gauge (12) and a sealing pressure gauge (13) in parallel.

6. The emergency air source box of the water gate of the refueling pool of the nuclear power plant as claimed in claim 4, wherein: the air outlet pipe (4) is connected with the water gate sealing gasket air supply pipe through a hard pipeline.

7. The emergency air source box of the water gate of the refueling pool of the nuclear power plant as claimed in claim 2, characterized in that: the emergency air supply air inlet pipe (2) is connected with an emergency air source nitrogen cylinder through hard pipeline arrangement.