Dispersion-filled composite insulation layer for nuclear-grade equipment and pipelines

Abstract

The invention discloses a dispersion-filled composite thermal insulation layer for nuclear-grade equipment and pipelines, which comprises a thermal insulation outer box, inner and outer gamma shielding layers filled inside the thermal insulation outer box, boron carbide powder and metal reflective foils, and inner and outer gamma shields. The shielding layers are all made of inorganic shielding materials with metal properties; the filling sequence on the thickness section of the insulation layer is: the inner shell plate of the insulation outer box, the inner gamma shielding layer, the metal reflective foil, and the outer gamma shielding layer and the shell plate of the thermal insulation outer box, the boron carbide powder is evenly dispersed in the cavity between two adjacent layers of metal foil; the metal reflective foil is in the form of positive and negative conical boss corrugations arranged at regular intervals vertically and horizontally shape, and two adjacent layers of metal reflective foils are stacked alternately in a back-to-back style with the apex of the front and back conical bosses. The invention provides a composite metal thermal insulation layer with thermal insulation function and screen radiation shielding function, which can be used in a high-temperature radiation environment for a long service life without replacement.

Description

technical field [0001] The invention relates to the technical field of the nuclear industry, in particular to a dispersion-filled composite thermal insulation layer for nuclear-grade equipment and pipelines. Background technique [0002] When the nuclear reactor is in normal operation, high-temperature, high-pressure, and high-radioactive cooling medium flows inside the primary equipment and pipelines of the nuclear reactor. It is necessary to install an insulation layer on the outer surface of the equipment and pipelines to reduce heat loss. Shielding materials are installed outside the equipment and pipelines to reduce the radiation dose around the equipment, which is helpful for personnel's inspection and maintenance during service. At present, the first-level equipment and the outside of the pipeline of the nuclear reactor coolant system usually use a metal insulation layer, but this metal insulation layer only has the function of heat preservation and heat insulation, a...

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