Russia forges nuclear steel to brave 1112°F for next-gen reactors

Russian scientists have developed a new heat-resistant austenitic steel designed for use in lead-cooled fast neutron reactors operating at temperatures between 500°C and 600°C (932°F to 1112°F), significantly higher than the typical 320°C to 350°C range of standard VVER reactors. Created under the “Breakthrough” (Proryv) project, which aims to implement a closed nuclear fuel cycle (CNFC) using fast neutron reactors, this steel offers enhanced corrosion resistance, thermal stability, and superior long-term strength compared to existing materials. The development utilized computer modeling and data from heavy liquid metal coolant systems, ensuring the material meets the demanding radiation and thermal conditions of next-generation reactors. In addition to the steel, researchers at CNIITMASH tested laser welding technologies for both austenitic and martensitic-ferritic steels, including dissimilar metal joints, demonstrating increased production speed and weld quality consistent with industry standards. This welding method is compatible with current reactor designs