Leningrad NPP: the unique safety localization system of the power unit No 1 with VVER-1200 reactor has been successfully tested 31.08.2017  INFORMATION AND PUBLIC RELATIONS DEPARTMENT OF LENINGRAD NPP

Leningrad NPP: the unique safety localization system of the power unit No 1 with VVER-1200 reactor has been successfully tested

At the Leningrad NPP’s power unit No 1 under construction the passive heat removal system from the building envelope (PHRS BE) has been successfully tested. Its working capacity has been fully proved.

The testing was carried out at the hot trial stage at the equipment – the main and auxiliary technological systems of normal operation and safety systems. The hot trial is the final large stage of commissioning before the startup.

“The testing has proved that in case of any non-project emergency - including the reactor core damage, the loss of coolant from the primary circuit, active safety system failure or NPP blackout - long-term heat removal from the building envelope will be fully provided. The pressure inside the containment will remain within the limits specified in the project. Thus, the containment integrity as the last safety barrier of the power unit will be guaranteed; this will fully exclude the radioactive materials release into the environment”, the Chief Engineer of Leningrad NPP under construction Aleksandr Belyaev commented the results of the work done.

The passive heat removal system from the building envelope is designed in accordance with the newest requirements for nuclear power plants. Engineering solutions applied in this system are intended to provide higher level of the modern power unit safety. The constructing power unit No 1 with VVER-1200 reactor of Leningrad NPP is the first power unit in Russia equipped with the safety localization system.

“The passive heat removal system from the building envelope has a number of advantages: it is based on the passive operating principles, it doesn’t depend on the sources of power supply and require no operator intervention. Another system’s peculiarity is its continuous readiness for work and the absence of any support systems. In case of hypothetical emergency PHRS BE would keep the heat removal from the building envelope for more than 20 hours”, the Head of Reactor Shop of Leningrad NPP under construction Vitaliy Shutikov added.

It is to be recalled that during the hot trial the specialists check the design parameters of the main equipment, technological systems and their readiness for operation and nuclear fuel loading. Thus, the successful implementation of the hot trial stage in fact means the readiness of the power unit No 1 of Leningrad NPP for nuclear fuel loading.

The Leningrad NPP is an affiliate company for Rosenergoatom Concern OJSC. The plant is based in the city of Sosnovy Bor, 40 km to the west from Saint Petersburg at the Gulf of Finland shore. The Leningrad NPP is the first Russian nuclear power plant having RBMK-1000 reactors (uranium-graphite channel-type thermal neutron reactors). The NPP exploits 4 power blocks with the electric capacity of 1000 megawatt each. Also, pursuant to the NPP-2006 project, 1,2 VVER-1200 power blocks included into The State Atomic Energy Corporation ROSATOM long-term plan are being constructed. Rosenergoatom Concern OJSC is the owner and developer of the project. Holding TITAN-2 is the primary contractor. ATOMPROEKT is the general designer.



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