The Leningrad NPP-2: voltage has been applied at the water treatment building of the 2nd VVER-1200 power block

The water treatment building at the Leningrad NPP’s 2nd VVER-1200 power block under construction has received electric power supply as scheduled. 10-kilowatt voltage is applied from auxiliary spare transformers at the facility normal operation section, then it’s lowered to 0.4 kilowatt and allocated among consumers.

Before the electric power equipment was launched operational, a team of specialists had undertaken a few tests: continued operation at the base load for 72 hours has confirmed that the equipment assembly and adjustments were completed in a proper manner and are ready for operation.

The water treatment building is the sixth one among the key objects of the power block under construction, where the designed power supply is set and the operational mode is introduced. This February, large-scale designed voltage supply started at the 2nd VVER-1200 power block. As of now, voltage of 10 and 0.4 kilowatt has been applied to the normal operation electric power supply building, the administration office building, the block diesel power plant, the joint fire-fighting water supply pump station, and the industrial heating building.

According to Viacheslav Voblikov, the head of the electric power shop at the Leningrad NPP-2, all auxiliary voltage application works are conducted according to the schedule. All in all, the specialists are to connect several dozens of facilities to the electric power supply. These are primarily the reactor building, the turbine building, the unit-wide control building and others housing technological systems taking part in the pre-commissioning activities scheduled for 2019.

Viacheslav Voblikov: ‘The auxiliary voltage application means lighting, ventilation and water supply for the facilities, and this is a critical step for moving towards the liquid release over the open reactor and the cold-and-hot tests. During the liquid release, we will verify the passing ability of the reactor facility pipes. The trial run will enable us to confirm the reactor facility’s equipment operability at the design conditions. The voltage applied to the reactor building will power the operation of electric engines at the four major circulation pumps, which, in turn, will cater for the primary loop recirculation necessary for the trial run’. 

The Leningrad NPP is the country’s first plant with RBMK-1000 reactors (uranium-graphite circuit-type reactor running on thermal neutrons). The decision that marked its construction was taken in September 1966 by a resolution of the Central Committee of the Communist Party of the USSR and the Council of Ministers No. 800-252. According to that document, the Leningrad NPP was supposed to become a core in a network of nuclear power plants with RBMK-1000 reactors that were supposed to produce a substantial share of electric power. The construction of the Leningrad NPP was going well, and by 1973 the first power block was fully erected. On December 23, 1973, following stable 72-hours’ operation at the capacity of 150 megawatt, the State Commission signed the acceptance certificate stating that the first power block of the Leningrad nuclear power plant is commissioned for pilot production. 

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