RU123867U1 - DRAINAGE DRAINAGE SYSTEM WITH RADIAL-AXIAL BEARING OF THE MAIN CIRCULATING PUMP UNIT - Google Patents

Abstract

1. A drainage system for leaks from a radial-axial bearing of the main circulation pump unit with a water-cooled radial-axial bearing (ROP) and a pressureless drain pipe for drainage of leaks with a ROP, characterized in that it is equipped with a collection and return circuit for leakages from the ROP to the industrial circuit of the reactor installation leakage collection tank, to which a pressureless drainage pipe for drainage of leaks with ROP is connected through a water seal, and from the working space of which drainage pipes for the tank and overflow and suction are removed pipelines with leakage drainage return pumps with ROP, each pump is equipped with a leakage drainage recirculation pipeline to the leakage collection tank, and leakage drainage return pumps of the leakage return pipes are connected to the drain circuit of the industrial circuit through the shut-off valve, while the leakage recovery tank is equipped with a level sensor, and all pipelines of the system are equipped with control, shut-off and control and measuring equipment. 2. The drainage system of leaks from the radial-axial bearing of the main circulation pump unit according to claim 1, characterized in that the height of the water seal is 1.0-1.5 m. 3. The leakage drainage system from the radial-axial bearing of the main circulation pump unit according to claim 1, characterized in that the drainage system and the overflow of the leakage collection tank are carried out in a station-wide leakage collection system for boron-containing water. The leakage drainage system from the radial-axial bearing of the main circulation pump unit according to claim 1, characterized in that it contains at least two leakage drainage return pumps with ROP.

Description

The utility model relates to power engineering, its area of application is water-cooled reactor units of the power units of nuclear power plants (NPPs), which include the main circulation pump units (GTsNA) of the GNTSA-1391, GTsNA-1719 type with water-cooled radial-axial bearings (ROP) ) and leakage drainage system with ROP.

As a prototype, a pump has been adopted for pumping liquid in a high-pressure circuit (RF patent No. 2190127, class F04D 29/04, published September 27, 2002), which is included in the main circulation pump unit of the reactor plant of the water-water type of a nuclear power plant and includes a circuit cooling and lubrication of the radial-axial bearing, which includes a discharge pipe with a throttle and a vertical expansion chamber, which in its upper part communicates with a retaining tank, and in the lower part with a supply pipe of this circuit. The lower part of the ROP has openings designed to drain leaks from it. The system of drainage leaks with ROP is carried out by dumping the drains into the special sewage system for further purification and processing. In this case, there is a need to replenish the industrial circuit with distillate by the amount of leakage discharged by the drainage.

The problem solved by the proposed utility model is to reduce the losses of the industrial circuit environment during the operation of the reactor installation by collecting drainage leaks from the RSC of the SSC and returning them to the industrial circuit.

As a solution to the problem, a leakage drainage system from the main circulation pumping unit (SCCA) with a water-cooled radial-axial bearing (ROP) and a pressureless drainage pipe for drainage of leakage drains with a ROP, equipped with a collection and return circuit for leakages from the ROP to the industrial circuit of the reactor unit containing a collection tank is proposed leaks to which a pressure-free drainage drain pipe with ROP is connected through a hydraulic lock, and from the working space of which drainage pipes for the tank and overflow and suction pipes water pipelines with leakage drainage return pumps with ROP, each pump is equipped with a leakage drainage recirculation pipeline to the leakage collection tank, and leakage drainage return pumps of the leakage return pipes are connected to the drain circuit of the industrial circuit through the shut-off valve, while the leakage recovery tank is equipped with a level sensor, and all pipelines the systems are equipped with adjustment, shut-off and control and measuring equipment. The height of the water seal is 1.0-1.5 m. Drainage and overflow of the leakage collection tank is carried out in a general station system for collecting leakages of boron-containing water. The leakage drainage system with MCP contains at least two return pumps for leakage drainage with ROP.

The drawing shows a diagram of a system of drainage leaks from a radial-axial bearing (ROP) of the main circulation pump unit (GTsNA).

It contains several (for example, four) GNCA 1 with a water-cooled ROP (not shown in the drawing), a pressure-free pipe 2 for draining drainage drains with a ROP with a flow meter 3, a funnel 4, into which drainage drains with ROP are collected, localizing group 5 with an electrically conductive shutoff valve , a water trap 6, having a height of 1.0-1.5 m, a leakage drainage collection tank 7 with a level sensor 8, equipped with a drainage pipe 9 and an overflow pipe 10, suction pipelines 11, leakage drainage return pumps with ROP 12 with recirculation pipelines 13 drainage pr leaks in the tank collecting leaks 7, the control valve 14. One of the pumps 12 is a backup. The pressure line 15 of the pump 12 return drainage of leaks with ROP connected to the drain line of the industrial circuit through the shut-off valve 16.

The system operates as follows.

Through non-pressure pipelines 2, drain drainage of leaks with ROP separately for each of the four SSCs 1, in order to avoid mutual influence, drainage of leaks with ROP is collected in a funnel 4 made with a height of ~ 1 m, while the pipelines are lowered into it by ½ of the height of the funnel. Through a special sealed penetration at the inlet and outlet of which there is a special protective armature - localizing group 5 with electrically conductive shut-off valves, the drains come from the sealed part of the reactor compartment to the unpressurized one. Then through the hydraulic lock 6 merge into the tank 7 collecting drainage leaks. The purpose of the water trap 6 is to exclude air from the leaky part of the reactor compartment to the airtight one during operation of the system, on the basis of which the height of the water trap is 1.0-1.5 m. The drainage pipelines of the tank 9 and overflow 10 are removed from the working space of the tank 7 for collecting leakage drains. The drainage of the system and the overflow of the leakage collection tank is carried out in a station-wide system for collecting leakages of boron-containing water. From the tank 7, drainage leaks with ROP through the suction pipe 11 by the pump 12 return the drainage of leaks through the pressure pipe 15 are fed into the discharge pipe of the industrial circuit through the shut-off valve 16, which allows you to disconnect from the industrial circuit the entire system of the return of drainage of leaks. For the purpose of redundancy, two pumps 12 for returning drainage drains with ROP were installed, each with its own shut-off valve and pipelines 13 for recirculating drainage of leaks with ROP into the leakage collection tank 7. Type of vortex pumps. Part of the medium pumped by the pump 12 is returned to the tank 7 through the recirculation pipe 13. The pump head 12 is determined by the back pressure in the industrial circuit system, equal to ~ 300 kPa and the hydraulic resistance of the route, including control valves with a throughput of K = 1 m / h. The shutoff valves on the suction 11 and pressure pipelines 15 allow any pump to be repaired during normal operation of the system. The initial filling of the pressure pipelines 15 and the leakage collection tank 7 is carried out from the industrial circuit system through the pipe 17 with shut-off and shut-off valves 18. The following parameters are monitored during the operation of the leakage return system from the RPM of each MCP 1: pressure at the pump head 12, level in the tank 7 for collecting drainage leaks, drainage flow rate of leakages from the ROP of each MCPA 1, total flow rate of leakage return to the industrial circuit. The leak return system with ROP GTsNA 1 is fully automated. It is possible to pre-select the first switch-on pump 12. An emergency reserve input (ATS) is provided in the event of a decrease in pressure at the pressure of a running pump 12 to 0.02 MPa or less and a level in tank 7 of more than 0.75 m. After switching on one of the pumps 12, the control fittings 14, the level controller 8 is included in the automatic mode of operation. After turning off the last pump 12, the level controller 8 switches to the remote control mode. Both pumps 12 are turned off when the level of distillate in the tank 7 decreases below 0.2 m.

The amount of leakage from the ROP of one MCPA is ~ 0.1 m / h. Accordingly, for a company of 1.5 years, the total value of leakage drainages can be estimated at 5200 tons. The economic effect of introducing a system for returning drainage drains with ROP GTSNA will be expressed in the absence of the need for distillate production to replenish the industrial circuit and in the absence of the need to process additional amount of special sewage water.

Claims (4)

1. A drainage system for leaks from a radial-axial bearing of the main circulation pump unit with a water-cooled radial-axial bearing (ROP) and a pressureless drain pipe for drainage of leaks with a ROP, characterized in that it is equipped with a collection and return circuit for leakages from the ROP to the industrial circuit of the reactor installation leakage collection tank, to which a pressureless drainage pipe for drainage of leaks with ROP is connected through a water seal, and from the working space of which drainage pipes for the tank and overflow and suction are removed pipelines with leakage drainage return pumps with ROP, each pump is equipped with a leakage drainage recirculation pipeline to the leakage collection tank, and leakage drainage return pumps of the leakage return pipes are connected to the drain circuit of the industrial circuit through the shut-off valve, while the leakage recovery tank is equipped with a level sensor, and all pipelines of the system are equipped with adjustment, shut-off and cut-off and control equipment. 2. The drainage system of leaks from the radial-axial bearing of the main circulation pump unit according to claim 1, characterized in that the height of the water seal is 1.0-1.5 m 3. The drainage system of leaks from the radial-axial bearing of the main circulation pump unit according to claim 1, characterized in that the drainage of the system and the overflow of the leakage collection tank are carried out in a station-wide system for collecting leaks of boron-containing water. 4. The drainage system of leaks from the radial-axial bearing of the main circulating pump unit according to claim 1, characterized in that it contains at least two return pumps for drainage of leaks from the ROP.

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