A kind of intermediate filling and shielding material insulation layer for nuclear-level equipment and pipelines

Abstract

The invention discloses an insulating layer of shielding material filled in the middle for nuclear-grade equipment and pipelines, which comprises an outer insulating box, a neutron shielding layer, a gamma shielding layer, and metal reflective foils on both sides of the cold and hot sides filled in the outer insulating box. Both the neutron shielding layer and the gamma shielding layer are made of inorganic shielding materials with metallic properties; the filling sequence on the thickness section of the insulation layer is as follows: the heat surface shell plate of the heat preservation outer box, the metal reflective foil on the heat surface side, Neutron shielding layer, gamma shielding layer, metal reflective foil on the cold side, and cold shell of the thermal insulation outer box; metal reflective foils on both sides of the cold and hot sides are 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 in a back-to-back style with positive and negative ball-socket apexes to apexes. The invention provides a composite metal thermal insulation layer with thermal insulation function and screen radiation shielding function, which can serve in a high-temperature radiation environment with a long service life.

Description

technical field [0001] The invention relates to the technical field of the nuclear industry, in particular to an intermediate filling shielding material 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 insulati...

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