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The article describes construction of primary circuit, its features and technical layout. VVER reactors are special design of Pressurized Water Reactors with some particular design features. VVER reactors are the most frequently build reactor type in the world, proposed and build by Rosatom. Beside this, we can alsonotice reactors EPR (European pressured reactor) proposed and build by Areva. Basically primary circuit consists from Reactor, Main circulating piping (MCP), steam generator, main circulating pump, main closure valve and pressurized system. Besides primary circuit there are auxiliary system and safety system for safe operation. Nowadays build reactors are defined as III+ generation with advanced technology.
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