System and method for steam purging of main steam pipeline of nuclear power plant

Abstract

The invention discloses a steam blowing system and method for a main steam pipeline of a nuclear power plant. The system comprises a water feed pump outlet isolation door (1), a high-pressure heater bypass pipe (2) and an external steam inflation valve set (8). An outlet of the water feed pump outlet isolation door (1) is connected to an inlet of the high-pressure heater bypass pipe (2). The external steam inflation valve set (8) is installed in an open hole in a water supply pipeline behind the water feed pump outlet isolation door (1). By means of the method, the time needed for heating external steam to steam reaching pipe blowing parameters through heat generated by rotation of a main pump (main nucleolus draught fan) is shorter, the pipe blowing time is greatly shortened, and a test run working period is shortened.

Description

Technical field: [0001] The invention relates to the technical field of nuclear power, in particular to a system and method for steam purging of a main steam pipeline of a nuclear power plant. Background technique: [0002] At present, the purging methods used in the main steam pipeline of PWR nuclear power plants are as follows: [0003] (1) Use the frictional heat generated by the rotation of the main pump of the nuclear island during the heat test to heat the water to turn it into steam, and use these steam to blow the pipe. Due to the limited heat generated by the main pump and the large latent heat of water vaporization, it takes a long time to generate steam and the amount of steam is small, and it takes a long time to blow the pipe, and it can only be purged symbolically, which cannot meet the requirements of the blow pipe; [0004] (2) Use compressed air to blow the pipe. GB50235 requires that steam pipes should be blown with steam pipes, using compressed air to bl...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of steam blowing method for the main steam pipe of the nuclear power plant in view of the deficiency of the method used for purging the main steam pipe of the secondary circuit of the pressurized water reactor nuclear power plant and the problem that there is no suitable method for the main steam pipe of the secondary circuit of the high temperature gas-cooled reactor. The sweeping system and method are suitable for both the pressurized water reactor nuclear power plant and the high temperature gas-cooled reactor nuclear power plant

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