The Volgodonsk Branch of JSC "AEM-technology" "Atommash" (part of the Rosatom Engineering Division - "Atomenergomash") has launched the welding of the upper semi-vessel of the RPV for Unit No.2 of Rooppur NPP in Bangladesh.
First the test assembly of components of the RPV semi-vessel took place – the professionals put together two shells and a flange. Further, with the help of a hoisting crane, the item was moved to a welding stand, where they began welding of two circumferential welds. Welding under heating was carried out at a temperature - 150-300 degrees.
After this operation, the product is heated up to 300 degrees in the zones of the welds. With the help of a bridge crane with a hoisting capacity of 180 tons, the professionals move the product into the furnace to conduct the HT for 4 days. At the same time the lower semi-vessel of the nuclear reactor, which consists of three shells and a bottom, is being produced.
The reactor represents a vertical cylindrical body with an elliptical bottom, inside of which there are the Core and the Internals. On top, it is sealed with a Cover with drives mechanisms and regulating bodies installed on top for the protection of the reactors and nozzles, intended for the sensor cables output for in-core monitoring. In the upper part of the vessel, there are nozzles for the coolant input and output, as well as nozzles for emergency supply of the coolant if the circuit is depressurized.
The "Rooppur" NPP is designed and built according to the Russian project. The plant will consist of two power units with a capacity of 1200 MW each, with VVER reactors of 3+ generation.