Shielding structure for nuclear reactor cable penetration device and installation method

The invention relates to the technical field of radiation protection, and particularly discloses a shielding structure for a nuclear reactor cable penetration device and an installation method, and the shielding structure comprises a combined shielding assembly and a flexible gap shielding device; a barrel of the cable penetration device is filled with the combined shielding assembly, the combined shielding assembly is provided with a heat insulation plate, a wrapping shielding body and a metal shielding body in the axial thickness direction of the combined shielding assembly, and the wrapping shielding body and the metal shielding body are used for achieving neutron shielding and gamma ray irradiation shielding respectively. The flexible gap shielding device is composed of a plurality of flexible shielding sheets which are filled in an annular gap between the cylinder of the cable penetration device and the embedded pipe. The cable penetration device not only can realize comprehensive radiation shielding pro