DEVICE FOR SETTING THE UPPER PLATE FOR SUPPORTING THE CLUSTER GUIDES IN RELATION TO THE TANK OF A NUCLEAR REACTOR.

摘要

Device for wedging and positioning the upper support plate of the fuel bundle guides relative to a bearing surface linked to the vessel of a pressurized water nuclear reactor, comprising a set of two rings, respectively an upper ring ( 22) and a lower ring (23), one applied to the support plate (8) and the other to the support surface (9) and between which is housed a stack of pre-loaded spring washers (24). BR/ According to the invention, this device is characterized in that it comprises a hollow connection barrel (26), provided with an axial channel (44) and passing through the two rings, this barrel being designed to be engaged in a bore (20,21) formed in the plate or the bearing surface, the lower ring (23) comprising connection means (27) with the barrel while the upper ring is slidably mounted relative to the latter. ci under the effect of the load applied to the spring washers, the barrel further comprising means (33) for securing it to the plate or to the bearing surface inside the bore which receives it.