Special filtering device for nuclear sampling system

Abstract

The invention relates to the technical field of medium filtration in nuclear sampling systems, and particularly discloses a special filtering device for a nuclear sampling system. A channel communicated to a middle cylindrical groove of a shell is formed in the side wall of a flange face at the upper end of the shell in the device, wherein the channel is communicated with a downstream pipeline through an outlet valve; the downstream pipeline is communicated with an opening in the bottom end of the shell through a bypass valve and an inlet valve, and the opening in the bottom end of the shell is further connected with the other pipeline through a blow-down valve; the end cover is sealedly fixed on the flange surface of the shell, so that the magnetic rod assembly fixed in the center of theend cover is inserted into the cylindrical groove in the middle of the shell; a filter element assembly is hermetically fixed on the lower end surface of the end cover, and the lower end of the filterelement assembly is positioned below the side wall channel of the shell and sealed with the inner side wall of the shell. The device is convenient to install, repair and operate and is good in filtering effect. The backwashing operation is simple and convenient, the normal operation of a sampling monitoring loop is not influenced, and the reliability of a nuclear power unit system and the unit availability are improved.

Description

technical field [0001] The invention belongs to the technical field of media filtration in a nuclear sampling system, and in particular relates to a special filtering device for a nuclear sampling system. Background technique [0002] One of the main functions of the nuclear sampling system of a nuclear power plant is to obtain the medium from the secondary circuit of the nuclear power plant for chemical analysis and radioactivity monitoring to determine the water chemical parameters of the secondary circuit and monitor possible leakage from the primary side of the evaporator to the secondary side. However, since carbon steel materials are commonly used in the secondary circuit process system of nuclear power plants, corrosion products can easily cause blockage of sampling circuit equipment, resulting in low or cut-off pipeline flow, resulting in the unavailability of nuclear sampling systems, which in turn affects unit availability (retirement prevention) . If an ordinary ...

AI Technical Summary

Problems solved by technology

However, since carbon steel materials are commonly used in the secondary circuit process system of nuclear power plants, corrosion products can easily cause blockage of sampling circuit equipment, resulting in low or cut-off pipeline flow, resulting in the unavailability of nuclear sampling systems, which in turn affects unit availability (retirement prevention)

If an ordinary filter is added to the nuclear sampling system, it will affect the accuracy and response speed of the radioactive monitoring instrument, which cannot meet the functional requirements of the system.

Images