NUCLEAR REACTOR PRIMARY CIRCUIT WITH A BRANCH PIPE EQUIPPED WITH A THERMAL SLEEVE

摘要

This nuclear reactor primary circuit (10) comprises: a primary pipe (30) having an internal surface bounding an internal volume (32) in which a primary coolant of the nuclear reactor flows; a branch pipe (34) fixed to the primary pipe (30) and bounding an internal passage (38) communicating with the internal volume (32) of the primary pipe (30); and a sleeve (36), having a first end (50) joined to the branch pipe (34) and a second free end (52) engaged in the internal volume (32) of the primary pipe (30), the second end (52) protruding into the internal volume (32) relative to the internal surface over a non-zero length, an annular space (54) being bounded between the sleeve (36) and the branch pipe (34). The primary circuit (10) comprises a device (60) for locking the sleeve (36), the locking device (60) comprising at least one first relief (62) formed in the branch pipe (34), at least one second relief (64) formed in the sleeve (36) and capable of interacting with the first relief (62) in order to prevent the sleeve (36) from falling into the primary pipe (30) if the sleeve (36) detaches from the branch pipe (34).