Rosatom has given an update on a vital component of India’s 1000 MW VVER (Russian Pressurized Water-type nuclear reactor). They have started to weld the 170 tons upper semi-vessel with the help of two circumferential welds that will take 22 days about three weeks). After welding the whole welded vessel will be heated to 300 degrees then the heating and holding process will be performed in the heating furnace to obtain some mechanical properties. After this heat treatment scientists will inspect the welding joints and the next process of internal corrosion resistance overlaying of that welding area will be performed. This part will be mechanized with an important reactor control mechanism, nozzles for inlet & outlet of coolant and, emergency coolant supply during circuit depressurization.