Izvestia Vysshikh Uchebnykh Zawedeniy. Yadernaya Energetika

The peer-reviewed scientific and technology journal. ISSN: 0204-3327

New generation first of the kind unit – VVER 1200 design features

10/02/2017 2017 - #03 Current issues in nuclear energy

Asmolov V.G. Gusev I.N. Kazanskiy V.R. Povarov V.P. Statsura D.B.

DOI: https://doi.org/10.26583/npe.2017.3.01

UDC: 621.039

The paper is concerned with the commissioning of the new generation NPP-2006 power unit with the VVER-1200 reactor. A comparison is made between the characteristics of the new NvNPP II-1 and commercial VVER-1000 power units (B-320). Some design and circuit solutions used in the NPP-2006 project, which allowed increasing the installed capacity of the power unit, are described as well. The installed higher capacity of the power unit was achieved, in particular, due to increasing the primary circuit pressure by 0.5 MPa and the steam generator pressure by 0.6 MPa as well as improving the main circulation pump by 2000 m3/h. The main differences in the equipment and the composition of passive and active safety systems of the NPP-2006 power unit are considered. A brief description of the safety systems first applied at Russian power units is given, e.g., a two-channel structure of active safety systems with redundant emergency pumps in each channel, a double containment, a core melt localization device, a passive heat removal system, etc. Due to the increased number of BRU-Ks, it was possible to increase their performance from 15 to 3 seconds, which significantly improved the maneuverability of the power unit in abnormal conditions.

The structure of the APCS is considered, which is applied in the NPP-2006 project, using programmable technology based on the TELEPERM XS platform. The peculiarities of commissioning of the power unit are analyzed, problematic issues that have arisen at various stages of the construction are revealed, some data on the tests carried out and the results of these tests are also given.

Finally, an analysis is made of some design deficiencies revealed during the construction and commissioning of the power unit, an evaluation of the project was made, and proposals were formulated to finalize the VVER-1200 project for consideration in the subsequent NPP projects.

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NPP-2006 rector steam generator power unit safety system accident APCS operation equipment containment accumulator tank