Korea Hydro & Nuclear Power validates 3D-printed nuclear component

Korea Hydro & Nuclear Power (KHNP) has successfully demonstrated the field applicability of 3D-printed nuclear power plant components. A 3D-printed multi-blade impeller, used to cool generator circuit breakers, operated without defects for 18 months at Saeul Nuclear Power Plant Unit 1 from its installation until its scheduled maintenance in July.

Unlike traditional components that consist of multiple blades assembled onto a fixed plate—a structure prone to damage at connection points—the new 3D-printed version utilizes an integrated design. By using additive manufacturing to create a single-piece structure, KHNP eliminated assembly processes and removed structural vulnerabilities, thereby enhancing durability and reliability.

Following rigorous testing of material properties, heat treatment, and mechanical performance, this successful operational cycle provides critical data for the long-term use of additive manufacturing in nuclear environments. KHNP plans to expand the use of 3D printing to other nuclear components and intends to apply the technology to the production of new parts for next-generation reactors, including Small Modular Reactors (SMRs).