METHOD AND CLOSURE DEVICE FOR SEALED PIPE PIPE INSTRUMENT OF A NUCLEAR REACTOR.

摘要

An open end portion (14a) of the thimble (14) of the instrumentation conduit is sealed, an extension (20) having a cross section of dimension is fixed in the extension of the thimble (14) smaller than the dimension of the internal cross-section of the instrumentation conduit, the glove finger (14) is moved by pushing on the extender (14) in the axial direction of the instrumentation conduit upstream, in the direction of the nuclear reactor vessel, until the end (14a) of the thermowell (14) is upstream of a mechanism for closing the instrumentation duct or of a sealed passage of the thermowell on which an invervention must be carried out and the annular clearance between the extender (20) of the thermowell (14) and the instrumentation conduit is sealed off, upstream of the mechanism or device for the sealed passage of the conduit instrumentation.