Structures for heat insulation of surfaces within a nuclear reactor

An improvement to a structure for heat insulation of surfaces within a nuclear reactor, said structure comprising an assembly of panels each formed by a stack of metal fabric elements applied against the surface to be protected by means of a double fixing system comprising a tubular member extending through a bore of a panel having one end attached to the surface, the opposite end of said tubular member being threaded and adapted to cooperate with a first nut which applies the panel against the surface by means of a bearing plate, and a stud mounted in the axis of the tubular member having one end attached to said surface, the opposite end of said stud being provided with a threaded head which extends beyond the extremity of the tubular member and cooperates with a second nut which supports a washer for preventing the tubular member and the panel from falling in the event of failure of said tubular member, and a protective housing surrounding the end of the head of the axial stud, said housing being rigidly fixed to the first nut.