Electric motors for the primary circulation pumps of the 2nd power block have been successfully installed at the Leningrad NPP-2

The installation of four electric motors for the primary circulating-water pump house assembly units has been successfully completed at the reactor hall of the second VVER-1200 power block at the Leningrad NPP-2. Each unit is around 46 tons, and they facilitate the main loop coolant circulation.

At first, the team assembled the electric motors at the new power block’s construction site, and then these motors were lifted into the reactor building’s containment.

Shortly, the staff will begin to bundle the motors with supply pipelines and auxiliary systems and conduct post-assembly lubrication system cleaning. Those will be followed by the pump equipment electric part tests with the primary circulating-water pump house assembly units being rotated at idle.

During the power block operation, the main pumping equipment of the NPP’s primary circuit, these four primary circulating-water pump house assembly units – will cater for coolant circulation through the reactor core.


Compared to the traditional VVER-1000 power blocks, the project for the 3+ generation Leningrad NPP power block has a number of advantages that considerably increase its economic parameters and safety standards. The capacity of the nuclear facility has been increased by 20%, from 1000 to 1200 megawatt; the designed life span of the core equipment has doubled and is now 60 years. In addition to that, this power block complies with the top international standards with regard to nuclear security. The Leningrad NPP-2 project serves as a reference for several international projects by the Rosatom State Corporation, such as the Belarusian NPP, the Paksh-2 NPP, the El Dabaa NPP, the Hanhikivi-1 NPP, etc.

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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