Cleaning device and method for two-loop valve cages

Abstract

The invention belongs to the technical field of nuclear power maintenance, and in particular, relates to a cleaning device and method for two-loop valve cages. The cleaning device for the two-loop valve cages comprises a cleaning tank, a first pump, a cleaning liquid storage box, a second pump, a third pump, a water inlet pipe, a cleaning liquid injecting pipe and a cleaning liquid recovery pipe;the cleaning tank is used for accommodating two-loop valve cages to be cleaned; the first pump is a high-pressure pump, and can pump water of water sources into the cleaning tank through the water inlet pipe to scour the two-loop valve cages; the cleaning liquid injecting pipe and the cleaning liquid recovery pipe are connected between the cleaning liquid storage box and the cleaning tank; the second pump is connected to the cleaning liquid injecting pipe for pumping cleaning liquid in the cleaning liquid storage box into the cleaning tank through the cleaning liquid injecting pipe; and the third pump is connected to the cleaning liquid recovery pipe, and is used for pumping the cleaning liquid in the cleaning tank into the cleaning liquid storage box through the cleaning liquid recovery pipe. The cleaning device can improve the cleaning efficiency of the two-loop valve cages.

Description

technical field [0001] The invention belongs to the technical field of nuclear power maintenance, and in particular relates to a cleaning device and method for a valve cage of a secondary circuit. Background technique [0002] Since the 3rd fuel cycle operation of Fangjiashan Unit 2#, the valve openings of the three main feedwater regulating valves (models 2ARE031VL / 032VL / 033VL) of the main feedwater ARE (main feedwater flow control system) have a tendency to increase abnormally, from 52% Slowly increases to a maximum close to 70%. The main feed water regulating valve is an important equipment of the secondary circuit system of the nuclear power plant. The valve opening limit is required to be 70% during the normal operation of the system. If the valve opening continues to increase, it will seriously affect the safe operation of the unit. [0003] The maintenance personnel dismantled and overhauled the main feedwater regulating valve 2ARE032VL with the largest opening, and ...

AI Technical Summary

Problems solved by technology

Since the opening diameter of the small hole in the cage of the main feedwater regulating valve is only about 6mm (millimeters), it cannot be descaled by general mechanical cleaning methods. The cage is cleaned by the usual high-pressure water gun and ultrasonic method, although there is a little scale Loose, but still deposited in the pores, with little effect and cannot be removed

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