DEVICE FOR INSTALLING EXTERNAL THERMAL INSULATION ON A NUCLEAR REACTOR VESSEL

The invention refers to the area of nuclear power engineering, particularly to auxiliary devices for nuclear power plants, namely to the devices for installation of the outer heat insulation of a nuclear reactor vessel, and can be used at nuclear plants for recovery annealing of the VVER reactor vessel welds.The objective to be achieved with the use of the claimed invention is to provide the possibility for installation and dismantling of heat insulation on the outer surface of the VVER reactor vessel in the confined space of the subpile room and at the increased level of ionizing radiation.Reduction of the temperature gradient through the thickness of the nuclear reactor vessel by heat insulation of the external reactor vessel surface, assurance of uniform physical properties for the reactor vessel metal and welds and reduction of thermal impacts on the surrounding structures during recovery annealing of the welds and/or base metal of the VVER reactor vessel shall be the technical result of this invention.The technical result of the invention is ensured by the fact that the device for installation of the outer heat insulation of a nuclear reactor vessel includes a mobile transfer trolley equipped with the mechanism for its movement, a removable bearing rim located on the mobile transfer trolley with the reactor vessel heat insulation attached to it, at least two lifting devices located on the opposite sides of the reactor vessel at the level of its upper section, in this case the removable bearing rim is connected to the lifting devices with the possibility to lift and lower it.Application of the claimed invention will provide the possibility for installation and dismantling of heat insulation on the outer surface of the VVER reactor vessel in the confined space of the subpile room and at the increased level of ionizing radiation. Heat insulation of the external reactor vessel surface will ensure reduction of the temperature gradient through the thickness of the nuclear reactor vessel, uniformity of the physical properties for its metal and welds as well as reduction of thermal impacts on the surrounding structures during recovery annealing of the welds and/or base metal of the VVER reactor vessel.