The Leningrad NPP-2: the construction of auxiliary buildings for the 2nd VVER-1200 power block’s reactor is on schedule

The construction of auxiliary buildings for the 2nd VVER-1200 power block’s reactor building at the Leningrad NPP-2 sticks to the plan: over a half of walls and floor structures of the dome containment have been reinforced and concreted.

According to Pavel Ivanov, the lead engineer of the construction control unit at the Leningrad NPP-2 capital construction department, the focus has been on the work processes and top-notch quality of the material used. ‘These buildings will house particular elements of the passive systems for removing heat from steam generators and containment. This equipment is crucial for maintaining the security of the power block. The constructions need to guarantee protection against any possible extreme exposure. This is why, for this very facility, we use special enforcements with increased formability and durability and strong welding properties, as well as extra strong frost-resistant and water-proof concrete. I’m pretty confident that the reference sample trials that will be carried out following the development of strength in concrete will verify the outstanding quality of the whole monolithic construction’, he noted.

The erection of in-situ reinforced concrete constructions runs layer by layer in the following technology sequence: installation of reinforcements and embedded parts, setup of a secluded manageable grounding circuit, formwork setup, concreting, concrete maintenance until it reaches its design strength.

According to the schedule, the auxiliary buildings construction activities are to be completed in fall, before the 2nd VVER-1200 power block’s reactor building confinement trials start.


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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