An emergency gas source box for water gates of a nuclear power plant refueling pool

Abstract

The present invention belongs to the field of equipment machinery, and specifically relates to an emergency air source box for a water gate of a refueling pool in a nuclear power plant. When the maintenance compressed air supplying the water gate sealing gasket fails or the air supply is not smooth, the sealing of the water gate will be affected, causing the radioactive water in the component pool to leak to the reactor pool side. In this device, the air inlet pipe, the compressed air source isolation valve, the air source non-return valve and one end of the tee are connected in sequence through pipelines; the pressure reducing valve is connected to one end of the tee and the non-return valve after the pressure reducing valve through a pipeline; the exhaust pipe and the exhaust pipe isolation valve are connected through a pipeline. This set of equipment changes the air supply source of the water gate of the refueling pool from a single air source to a dual air source supply. The dual air supply increases the reliability of the water gate sealing, so that when the normal compressed air fails or the air supply is not smooth, the spare emergency air source can immediately supply air, effectively avoiding single failures and reducing operational risks.

Description

Technical Field

[0001] The invention belongs to the field of equipment machinery, and in particular relates to an emergency air source box for a water gate of a refueling pool in a nuclear power plant. Background Art

[0002] The refueling pool gate is installed in the channel between the component pool and the reactor pool, which can separate the component pool from the reactor pool and seal it, dividing the entire refueling pool into two. The sealing of the gate is ensured by the inflatable sealing gasket. The maintenance compressed air system provides compressed air for the gasket inflation.

[0003] After the water gate is installed, the reactor pool can be drained separately, while the component pool remains filled with water, so that the reactor pool side can be inspected separately. Under low water level conditions, maintenance personnel directly enter the bottom of the reactor pool to inspect the flange surface and main bolt holes of the pressure vessel, measure and record defects, and repair them. The refueling pool water gate, after the water gate is installed in the channel between the component pool and the reactor pool, can achieve the sealing of the component pool and the reactor pool. During the low water level of the pressure vessel, the reactor pool can be drained for low water level maintenance work, while the component pool can be kept full of water to shield the radioactive dose of the upper in-core components and in-core instrumentation.

[0004] When the maintenance air compressor supplying the water gate seal fails or the air supply is blocked, the sealing of the water gate will be affected, causing the radioactive water in the component pool to leak to the reactor pool side, seriously threatening the personal safety of the maintenance personnel in the reactor pool.

[0005] Therefore, it is urgent to invent an emergency gas source box for the sluice gate of the nuclear power plant refueling pool, and add a backup gas source so that when the normal compressed air fails or the gas supply is not smooth, the backup emergency gas source can supply gas immediately to prevent the reactor building sluice gate from leaking and affecting normal maintenance work. Summary of the invention

[0006] 1. Purpose:

[0007] The purpose of this patent is to design an emergency air source box for the water gate of the nuclear power plant refueling pool to ensure that when the normal air supply is lost, the emergency air source can be supplied to the sealing gasket of the water gate to maintain the sealing of the water gate.

[0008] 2. Technical solution:

[0009] An emergency air source box for a water gate of a refueling pool in a nuclear power plant, wherein an air inlet pipe, a compressed air source isolation valve, and an air source non-return valve are sequentially connected through pipelines; a pressure reducing valve is connected to the air source non-return valve and a non-return valve behind the pressure reducing valve through a pipeline; and an exhaust pipe and an exhaust pipe isolation valve are connected through a pipeline.

[0010] The other end of the air source one-way valve is connected to the emergency air supply pipeline one-way valve through a pipeline, the other end of the emergency air supply pipeline one-way valve is connected to the air supply line isolation valve through a pipeline, and the other end of the air supply line isolation valve is connected to the emergency air supply inlet pipe.

[0011] The other end of the one-way valve behind the pressure reducing valve is connected to one end of the gasket air inlet isolation valve through a pipeline, and the other end of the gasket air inlet isolation valve is connected to the air outlet pipe through a pipeline.

[0012] The other end of the exhaust pipe isolation valve is connected to the exhaust pipe through a pipeline.

[0013] The two ends of the gasket air inlet isolation valve are connected in parallel with a gas pressure gauge and a sealing pressure gauge.

[0014] The air outlet pipe is connected to the air supply pipe of the water gate sealing pad through a hard pipeline.

[0015] The air inlet pipe is connected to the emergency gas source nitrogen bottle through a hard pipeline arrangement.

[0016] 3. Effect:

[0017] This device changes the air supply source of the sluice gate of the refueling pool from a single air source to a dual air source. The dual air supply increases the reliability of the sluice gate seal. Compared with the previous single air supply of compressed air source, an emergency air source box is designed to add an emergency air source. When the normal compressed air fails or the air supply is not smooth, the backup emergency air source can supply air immediately, effectively avoiding single failures and reducing operational risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 :Internal structure diagram of emergency air source box for refueling pool sluice gate

[0019] In the figure: 1. Inlet pipe; 2. Emergency air supply inlet pipe; 3. Exhaust pipe; 4. Outlet pipe; 5. Compressed air source isolation valve; 6. Compressed air source pressure reducing valve; 7. One-way valve after the pressure reducing valve; 8. Emergency air supply pipeline one-way valve; 9. Exhaust pipe isolation valve; 10. Air supply pipeline isolation valve; 11. Gasket air inlet isolation valve; 12. Air pressure gauge; 13. Sealing pressure gauge; 14. Air source one-way valve; 15. Tee. DETAILED DESCRIPTION

[0020] The present invention is an emergency air source box for a water gate of a nuclear power plant refueling pool. Figure 1As shown, it is mainly composed of air supply and exhaust pipes, exhaust pipe isolation valves, air source one-way valves, compressed air source pressure reducing valves and sealing pressure gauges. The entire device is installed in a rectangular box and can be made into standard parts. The air inlet pipe 1 is connected to the normal compressed air source for maintenance of the nuclear power plant through a hard pipeline, the emergency air supply air inlet pipe 2 is connected to the emergency air source nitrogen bottle through a hard pipeline, the air outlet pipe 4 is connected to the water gate sealing gasket air supply pipe through a hard pipeline, and the exhaust pipe 3 is open to the air. Under normal circumstances, the compressed air source for maintenance of the nuclear power plant passes through the air inlet pipe 1 through the compressed air source isolation valve 5, the one-way valve 14, and the three-way 15. The pressure is reduced to 0.22MPa by the compressed air source pressure reducing valve 6, and then through the one-way valve 7 after the pressure reducing valve, and the sealing gasket air inlet isolation valve 11 supplies the water gate sealing gasket; the emergency air supply pipeline one-way valve 8 prevents gas from leaking to the emergency air source side during normal air supply. When the compressed air source for maintenance fails, the emergency air source passes through the air intake pipe 2, the air supply line isolation valve 10, the emergency air supply line check valve 8, and the three-way 15, and the pressure is reduced to 0.22MPa by the pressure reducing valve 6, and then through the check valve 7 after the pressure reducing valve, the air intake isolation valve 11 is sealed to supply the water gate sealing gasket; the air source check valve 14 prevents the emergency air source from leaking gas to the faulty air source side. After closing the air intake valve 11, the air pressure gauge 12 and the sealing pressure gauge 13 respectively display the intake pressure and the sealing pressure. When the water gate sealing gasket needs to be exhausted, after closing the air intake valve 11, open the exhaust pipe isolation valve 9 to exhaust.

[0021] according to Figure 1 As shown, the air inlet pipe 1 of the emergency air source box is connected to the compressed air source for maintenance through a hard pipeline, the air inlet pipe 2 of the emergency air source box is connected to the emergency air source nitrogen bottle through a hard pipeline, the air outlet pipe 4 of the emergency air source box is connected to the air supply pipe of the water gate sealing pad through a hard pipeline, and the air exhaust pipe 3 of the emergency air source box is to the air;

[0022] Close the exhaust pipe isolation valve 9, the air supply line isolation valve 10 and the gasket air inlet isolation valve 11, open the compressed air source, and open the compressed air source isolation valve 5. Adjust the pressure of the pressure reducing valve to 0.22MPa through the compressed air source and lock it, and check whether there is any leakage at each joint on the pipeline from the emergency air source box to the compressed air source;

[0023] Close the emergency gas source box isolation valve 5, exhaust pipe isolation valve 9 and gasket air inlet isolation valve 11, open the emergency gas source nitrogen bottle, and open the gas supply line isolation valve 10, and check whether there is any leakage at each joint on the pipeline from the emergency gas source box to the emergency gas source nitrogen bottle;

[0024] Confirm that the exhaust valve 9 of the sluice gate air source box is closed, open the air supply valve 5 of the emergency air source box and the exhaust pipe isolation valve 9, and check whether there is any leakage at each joint on the pipeline from the emergency air source box to the sluice gate air source box;

[0025] Close the main air supply valve 5 of the external air source (the pressure regulating valve remains in the current state unchanged), open the air supply line isolation valve 10, the gasket air inlet isolation valve 11, and the exhaust isolation valve 9 to ensure that the exhaust pipeline of the sluice gate air source box is unobstructed; the emergency air source box test is completed.

Claims

1. An emergency air source box for a water gate of a nuclear power plant refueling pool, characterized in that: The air inlet pipe (1), the compressed air source isolation valve (5), the air source non-return valve (14) and one end of the three-way valve (15) are connected in sequence through pipelines; the pressure reducing valve (6) is connected to one end of the three-way valve (15) and the non-return valve (7) after the pressure reducing valve through a pipeline; the exhaust pipe (3) and the exhaust pipe isolation valve (9) are connected through a pipeline; The other end of the three-way connection (15) is connected to the emergency gas supply pipeline check valve (8) through a pipeline, the other end of the emergency gas supply pipeline check valve (8) is connected to the gas supply line isolation valve (10) through a pipeline, and the other end of the gas supply line isolation valve (10) is connected to the emergency gas supply inlet pipe (2).

2. The nuclear power plant refueling pool water gate emergency air source box as claimed in claim 1, characterized in that: The other end of the one-way valve (7) after the pressure reducing valve is connected to one end of the gasket air inlet isolation valve (11) through a pipeline, and the other end of the gasket air inlet isolation valve (11) is connected to the air outlet pipe (4) through a pipeline.

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

4. The nuclear power plant refueling pool water gate emergency air source box as claimed in claim 2, characterized in that: The two ends of the gasket air inlet isolation valve (11) are connected in parallel to a gas pressure gauge (12) and a sealing pressure gauge (13).

5. The nuclear power plant refueling pool water gate emergency air source box as claimed in claim 3, characterized in that: The air outlet pipe (4) is connected to the air supply pipe of the sluice gate sealing pad via a hard pipeline.

6. The nuclear power plant refueling pool water gate emergency air source box as claimed in claim 1, characterized in that: The emergency air supply inlet pipe (2) is connected to the emergency gas source nitrogen cylinder via a hard pipeline arrangement.

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