Nuclear power station conventional island desalted water distribution system full-stop overhauling method

Abstract

The invention discloses a nuclear power station conventional island desalted water distribution system full-stop overhauling method. The method comprises the steps that A, ice blockage is carried out on a main pipeline between a conventional island desalted water distribution system and a unit, and an isolating device and a connecting device are additionally arranged at the downstream part of ice blockage; B, a temporary water supply pipeline is connected to the connecting device from an SED, operation verification is carried out on the temporary water supply pipeline, and the temporary water supply pipeline is communicated with the main pipeline between the conventional island desalted water distribution system and the unit through the connecting device after the temporary water supply pipeline is qualified; C, the connecting device is opened to supply water to the unit, and then the isolating device is closed; D, the conventional island desalted water distribution system is made to stop fully, isolating and emptying are carried out, and damaged or aged devices on the main pipeline are replaced; E, a drain valve and a vent valve are opened fully, the system is filled with water, air in the system is exhausted, the system is washed, samples are taken for a laboratory test, and after the samples are qualified, the drain valve is closed, and the conventional island desalted water distribution system is put into operation; F, the connecting device is disconnected with the temporary water supply pipeline, and the connecting device is sealed. The nuclear power station conventional island desalted water distribution system full-stop overhauling method is convenient and rapid to implement, safe and low in cost.

Description

technical field [0001] The invention belongs to the technical field of nuclear power, and relates to a maintenance method, in particular to a complete shutdown maintenance method for a conventional island desalinated water distribution system of a nuclear power plant. Background technique [0002] The function of the conventional island demineralized water distribution system (SER) is to provide the unit with demineralized water with a pH of 9. After the SDA (desalinated water production system) completes the desalinated water production, it is transported to the DOSER401 / 402BA in the north of YA, and then from the DOSER401 / 402PO located in the basement of the YA factory, through the main pipe of the DOSER, and respectively through the nuclear island desalted water distribution system , The conventional island desalted water distribution system delivers desalted water to the nuclear island and the conventional island of the unit. [0003] In the existing nuclear power plant...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a convenient, fast, safe and low-cost nuclear power plant conventional island desalinated water distribution system full stop maintenance method

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