Power Unit No. 2 was taken out of service on 1 September. Fault detection of equipment is being completed, and about 70% of the works on preparing and checking metal with industrial safety expert reviews have been completed.
Following the results of the boiler equipment inspection, the tee of the live steam combining assembly will be replaced. Power engineers have also performed diagnostics of the generator: rotor and stator. The comments identified are being resolved. According to the results of comprehensive tests, after the completion of repairs, the operation of the equipment will continue for the next six years.
In addition, the 4th pass coils of stage 2 high pressure convection superheater will be replaced in the boiler of Power Unit No. 2 (810 MW STU). All works are being performed as per the schedule. The dismantling of old elements has been completed, about 100% of joints have been prepared for welding, and 700 welded joints have been welded (50% of the planned volume) at the moment. Power engineers are to replace 730 pipes. Hydraulic testing of the boiler will start in mid-November 2022.
In addition to the above, KAG-24 (24 kV complex automated generators) are being replaced at Power Unit No. 2 as part of technical refurbishment. The old unit has been completely dismantled, a process-oriented opening has been made. A new circuit breaker has been installed in a regular place, it is being piped. Works are continuing on the refurbishment of KRU (packaged switchgear)-6 kW section. Power engineers have already reached the final stage of repairs of this equipment.
All works at Power Unit No. 2 (810 MW STU) at Surgutskaya GRES-2 Branch of Unipro PJSC will be completed in December 2022.