DEVICE FOR THE TEMPERATURE EQUALISATION IN THE CIRCUMFERENTIAL DIRECTION OF A TRAVERSING COLLAR SUBJECT TO A CIRCUMFERENTIAL TEMPERATURE GRADIENT

摘要

1. Device for reducing circumferential temperature gradients around the surface of a sleeve (14a), whose axis is vertical, around a component passing through the upper slab (4) of a nuclear reactor, a rising current of hot gas providing hot zones and a descending current of cooled gas providing cooler zones, comprising means (30, 50) fixed to one of the faces of the sleeve to transfer heat from a hot zone of the sleeve (14a) to a cooler zone of that sleeve, said zones being located at the same level, characterized in that the heat transfer means comprise at least one closed hollow liquidfilled ring (30), said ring (30) comprising a plurality of sections (30a, 30b, 30c) inclined with respect to the horizontal (31) means for fixing the said face of the said sleeve (14a), and means to provide thermal contact between each of said rings and said sleeve (14a), expansion vessels (35) being provided at the highest points of the inclined ring-sections.