Importance

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Abstract

A nuclear reactor primary circuit with a branch equipped with a thermal sleeve is provided. The nuclear reactor primary circuit includes a primary tubing, having an inner surface delimiting an inner volume in which a primary fluid circulates for cooling the nuclear reactor; a branch fastened to the primary tubing and delimiting an inner passage communicating with the inner volume of the primary tubing; a sleeve, having a first end connected to the branch and a second free end engaged in the inner volume of the primary tubing, the second end protruding in the inner volume relative to the inner surface over a non-zero length, an annular space being delimited between the sleeve and the branch. The primary circuit comprises a device making the sleeve unlosable, the unlosability device comprising at least one first raised portion formed on the branch, at least one second raised portion formed on the sleeve and capable of cooperating with the first raised portion to prevent the sleeve from falling into the primary tubing if the sleeve separates from the branch.

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First Claim