Possible in-service damages of steam generators at VVER-1000 and VVER-1200 NPP units and their impact on long-term operation

Abstract

Specific features of corrosion-mechanical damages of primary circuit header to steam generator vessel branch welds at VVER-1000 NPPs and their impact on safety and economic efficiency during long-term operation are analysed. Measures to avoid the damages for similar zones of VVER-1200 steam generators are discussed.

Keywords

• vver-1000& vver-1200 reactor facilities
• long-term operation
• steam generator
• weld of primary circuit header to steam generator branch
• corrosion-mechanical damage in operation