Exhaust device of nuclear island drainage exhaust system of nuclear power station

Abstract

The invention belongs to the technical field of nuclear power plant equipment maintenance, and particularly relates to an exhaust device of a nuclear island drainage exhaust system of a nuclear powerplant. A set of exhaust device is connected in parallel to an exhaust pipeline at the top of nuclear island voltage stabilizer equipment, and two tee joints, an isolation valve, a vacuum pump (vacuumejector) and other devices are additionally arranged on an original pipeline. The vacuum ejector is powered by compressed air, and exhausted gas mixed with gas of a loop returns to a nuclear island drainage and exhaust system. According to the device for the flushing stage of the primary loop after overhaul of the nuclear power station, the vacuum ejector is additionally arranged on the exhaust pipeline through a set of exhaust device of the nuclear island drainage and exhaust system, primary loop gas is exhausted through the vacuum ejector, and the primary loop is filled with water. The vacuum ejector is powered by overhaul compressed air, and exhausted gas mixed with gas of a loop returns to a nuclear island drainage exhaust system. when the liquid level of the pressure stabilizer reaches full water, the pressure stabilizer exhaust valve and the isolation valve of the vacuum ejector are closed.

Description

technical field [0001] The invention belongs to the technical field of maintenance of nuclear power plant equipment, and in particular relates to an exhaust device for a nuclear island drainage exhaust system of a nuclear power plant. Background technique [0002] After the main system of the nuclear island of the M310 model is drained to a low water level, when the water is flushed again, due to the influence of the inverted U-shaped pipe of the steam generator and the circular top cover of the pressure vessel, the air in the pipes and equipment cannot be completely discharged from the system. The air in the main system is driven out by means of static exhaust-dynamic exhaust-combined exhaust, in which dynamic exhaust and combined exhaust need to jog three reactor coolant pumps in sequence (hereinafter referred to as the main pump, the same below). [0003] The main pump is under the low-pressure platform of the main system, and the auxiliary thrust pad bears the axial vert...

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Problems solved by technology

In addition, there is a common mode problem in the design of the auxiliary thrust pad bearings of the main pump. When the main pump is operated on a low-pressure platform, the risk of wear of the auxiliary thrust pads of the motor is high. There have been defects in the abnormal wear of the auxiliary thrust pads of the main pump in the power plant.

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