Auxiliary water supply system for nuclear power plant steam generator

Abstract

The invention discloses an auxiliary water supply system for a nuclear power station steam generator. The auxiliary water supply system comprises a water storage tank and a centrifugal pump which are connected through multiple pipelines to form a circulation loop, a pipeline at an upstream inlet of the centrifugal pump is provided with a siphon connected with a medicine barrel, and a pipeline at a downstream outlet of the centrifugal pump is provided with a purifying device. According to the auxiliary water supply system, the inlet of the centrifugal pump is provided with the siphon connected with the medicine barrel, through siphoning before pumping, the medicine can be filled into the pipeline, the water storage tank is cleaned by utilizing power cycle of the centrifugal pump, online medicine filling is realized, risk operation such as hoisting and high altitude dosing can be avoided, and advantages of safety, convenience and rapidness are realized. The downstream outlet of the centrifugal pump is provided with the purifying device equipped with a detachable and washable filter core, and purifying demands of the water storage tank can be satisfied.

Description

technical field [0001] The invention belongs to the field of nuclear power plant debugging, and more specifically relates to an auxiliary water supply system for a steam generator of a nuclear power plant provided with a dosing device. Background technique [0002] The steam generator auxiliary feed water system (ASG) is a special safety system in the pressurized water reactor type, which replaces the normal feed water to provide feed water for the steam generator (SG) in case of an accident, and cools the primary circuit. Usually, each unit is equipped with an ASG water storage tank, auxiliary feed water pump subsystem and related pipelines and valves. The auxiliary feed water pump subsystem takes water from the ASG water storage tank and supplies it to the SG. When the unit is in normal operation, the ASG water storage tank stores desalted / deoxygenated alkaline water with a capacity of about 1200 cubic meters. [0003] In the installation stage, after the installation pe...

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Problems solved by technology

Gravity flushing of the ASG water storage tank through multiple filling and draining requires 1,200 cubic meters of water for each filling and draining. Since only gravity flushing is used, the effect is not obvious. According to experience, it needs to be performed 5-6 times, which not only wastes a lot of desalinated water, but also every time It takes a long time to fill and drain, and it takes about 7-9 days to complete 5-6 times of filling and draining

[0007] When adding chemicals, it is necessary to use lifting wheels to lift the medicines. Based on the water volume of 1200 cubic meters, about 25 barrels of hydrazine (7% concentration, 20kg per barrel) and 35 barrels of ammonia water (4% concentration, 25kg per barrel) need to be lifted each time. ), the lifting workload is heavy, and the dosing port is located on the top of the ASG water storage tank, the space is narrow and the ventilation is not smooth. risk

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