FIELD: nuclear power engineering. SUBSTANCE: unit to seal instruments of intrareactor monitoring is located in branch pipe on roof of nuclear reactor. Cylindrical part of sheath has groove where split ring is installed. Sheath with split ring placed into groove is put into socket of flange as far as it as it goes when ring rests against collar of socket. Unit is sealed by means of spacers and rings between them pressed with nut. Such design expands technological capabilities of maintenance as it allows sheaths to be removed without disassembling flange or flange to be removed without dismantling of sheaths. EFFECT: saving of expansive instruments and sheaths where they are installed, reduced maintenance time and cost. 2 dwg
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