Fixing device for out-of-pile neutron dosimeter of CAP1400 reactor pressure vessel

The utility model relates to the technical field of nuclear power stations, and particularly discloses a CAP1400 reactor pressure vessel out-of-pile neutron dosimeter fixing device which comprises a mounting pipe, a protective cover and a fixing piece, the mounting pipe can be arranged on the outer circumferential surface of a pressure vessel, and the protective cover is arranged on the outer circumferential surface of the pressure vessel. The axis of the pressure container and the axis of the mounting pipe are positioned on the same plane; one end, close to the bottom of the pressure container, of the mounting pipe is closed; a protective cover is arranged at the other end, close to the top of the pressure container, of the mounting pipe and has a closed state for closing the other end of the mounting pipe and an open state for opening the other end of the mounting pipe; the fixing part comprises a flexible chain, a plurality of dosimeter boxes are fixedly arranged on the flexible chain at intervals, a dosim