Exhaust optimizing method for primary circuit of million-kilowatt-level nuclear power station

Abstract

The invention relates to an exhaust optimizing method for a primary circuit of a million-kilowatt-level nuclear power station. The primary circuit of the nuclear power station comprises a reactor pressure vessel, a pressure stabilizer, a plurality of steam generators and a plurality of main pumps sequentially communicating by a main pipeline, and the plurality of steam generators correspond to theplurality of main pumps one by one. The method comprises the steps: carrying out water filling and exhausting on a circuit formed by communicating the reactor pressure vessel, the pressure stabilizerand the steam generators; and sequentially joggling the plurality of main pumps, and reducing the pressure to exhaust after completing the joggling of the plurality of main pumps so as to transfer gases in inverted U-shaped pipes of the plurality of steam generators to the reactor pressure vessel and then exhaust the gases in a water filling and exhausting way. By using the exhaust optimizing method for the primary circuit of the million-kilowatt-level nuclear power station, the exhaust time of the primary circuit of the nuclear power station is greatly shortened, and the wear and damage risks of the main pumps are greatly reduced.

Description

technical field [0001] The invention relates to the technical field of mega-kilowatt nuclear power, in particular to a method for optimizing the exhaust gas of a primary circuit of a mega-kilowatt nuclear power plant. Background technique [0002] The primary circuit of a nuclear power plant includes reactor pressure vessels, pressurizers, steam generators and main pumps connected in sequence by main pipes. During the overhaul of nuclear power plants, a combination of static exhaust and dynamic exhaust is usually used to complete the exhaust work of the primary circuit. The specific operation method is as follows: First, carry out the water filling and exhausting of the circuit formed by the connection of the reactor pressure vessel, the pressurizer and the steam generator, which is called static exhausting, that is, the circuit is filled with water to complete the corresponding reactor pressure vessel, stabilization Compressor and some pipeline exhaust, but at this time th...

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Problems solved by technology

[0003] In the traditional primary circuit exhaust process of nuclear power plants, in order to prevent the main pump from being damaged by excessive pressure drop in the primary circuit and prevent the gas from being re-inhaled by the main pump and unable to be discharged, it is required to perform a depressurization every time a main pump is jogged. Exhaust, the operation method of multiple step-down and exhaust not only takes a long time, but also increases the risk of wear and damage of the main pump

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