Nuclear power plant auxiliary steam and steam turbine shaft seal steam pipeline joint purging method

Abstract

The invention discloses a nuclear power plant auxiliary steam and steam turbine shaft seal steam pipeline joint purging method, and belongs to the technical field of nuclear power plant pipeline steampurging. The nuclear power plant auxiliary steam and steam turbine shaft seal steam pipeline joint purging method comprises the following steps that firstly, an adjusting valve in a pipeline, a filter element of a filter net and a filter element of a check valve are moved out; secondly, only a pipeline valve on a to-be-purged path is opened; thirdly, an auxiliary boiler is started, a steam isolation valve is gradually opened so as to conduct purging into the pipeline till the black or the brown of the steam at the pipeline outlet position disappears, and the steam isolation valve is closed; fourthly, installation or replacement of a target plate is conducted at the pipeline outlet position, the steam isolation valve is gradually opened, purging is conducted into the pipeline for a periodof time, the steam isolation valve is closed, the target plate index is detected, and whether the requirement is met or not is judged; and fifthly, the fourth step is repeatedly conducted till it is detected that two continuous purging results meet the requirement. By means of the nuclear power plant auxiliary steam and steam turbine shaft seal steam pipeline joint purging method, the nuclear power plant auxiliary steam and steam turbine shaft seal steam supply pipeline purging quality can be effectively improved, the purging time is shortened, and the purging cost is reduced.

Description

technical field [0001] The invention relates to the technical field of steam purging of nuclear power plant pipelines, in particular to a method for combined purging of nuclear power plant auxiliary steam and steam turbine shaft seal steam pipelines. Background technique [0002] Auxiliary steam plays a very important role in the operation of nuclear power plants. The use of auxiliary steam runs through a series of engineering stages of nuclear power plants from start-up to operation, shutdown and maintenance, and provides indispensable support for the normal operation of nuclear power plants. At present, the second and third generation nuclear power plants currently in operation in China and under construction are all equipped with auxiliary steam systems. The main function of the auxiliary steam system is to meet the start-up steam demand of nuclear power units. During the low load level of the power station start-up on the conventional island side, auxiliary steam is nee...

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Problems solved by technology

Both the auxiliary steam pipeline and the shaft seal steam pipeline need to add more temporary measures such as pipes and valves. The installation and removal of temporary measures will consume a lot of manpower and time; in addition, the existence of temporary measures will occupy a lot of space in the power plant building, and The purge pipes are high-temperature and high-pressure pipes, which brings great inconvenience to the development of other work in the power station

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