3D Printing in Nuclear Energy

Ensuring Reliability and Long-Term Availability in One of the Most Regulated Industries

Nuclear energy facilities operate under some of the most demanding conditions and safety frameworks of any industrial sector. Plants must deliver continuous, stable energy while maintaining a near-zero tolerance for component failure. Meanwhile, many reactors in operation today are several decades old, with ageing equipment, discontinued components and supply chains that can no longer provide the parts needed to support long-term operation.

Additive manufacturing (AM) offers a new approach for nuclear operators seeking to extend plant lifecycles, secure spare part availability, improve system reliability and maintain compliance with strict regulatory requirements. For SMRs, it can serve as a flexible base for future maintenance strategies. By enabling on-demand production of highly specialized, traceable and performance-optimized components, AM strengthens operational continuity in a sector where reliability is not optional, it is mandatory.

Challenges in the Nuclear Industry

Nuclear operators worldwide are facing unique and increasingly urgent challenges:

10_filigree

Ageing Fleets with Long Operational Lifetimes

Many nuclear plants were built decades ago, and their components require replacement far beyond original production timelines.

09_high_temperature

Strict Safety and Regulatory Requirements

Documentation, quality control, repeatability and material certification are essential for every component. 

Obsolescence of Critical Components

OEMs may no longer exist; tooling is unavailable and documentation for legacy parts is often incomplete.

13_automation

Limited Availability of Qualified Suppliers

Nuclear-grade parts demand rigorous documentation, testing and traceability - capabilities not every supplier can offer.

Long Lead Times

Conventional manufacturing often cannot deliver critical parts in time to support uninterrupted operation.

Why Additive Manufacturing for Nuclear

Additive manufacturing supports nuclear operators and suppliers in meeting strict technical, operational and regulatory requirements:

  • Lifecycle extension through spare parts: AM enables the reproduction of obsolete components without original tooling or OEM support.
  • On-demand production with full traceability: Every build can be documented, monitored and validated - consistent with nuclear quality frameworks.
  • Reduced dependency on legacy suppliers: Components can be produced locally, using qualified materials and verified processes.
  • Performance-optimized designs: Internal channels, improved flow behavior and reduced part count increase performance and reliability, while also enabling innovative design approaches for SMRs and next-generation reactor technologies.
  • Support for qualification and certification: AM enables controlled, repeatable manufacturing workflows suitable for nuclear qualification pathways.

Together, these capabilities make AM an increasingly important technology for ensuring continuous, safe and efficient nuclear operations.

Applications of 3D Printing in Nuclear

AM is already used across multiple nuclear applications and environments. These applications demonstrate that AM is not conceptual - it is already supporting operating reactors today:

  • Replacement parts for legacy systems: Obsolete impellers, housings, valve components and other critical parts. PCB protection, mimic panels
  • Pumps, valves and flow-critical components: Optimized for improved performance and increased durability.
  • Internal components with complex geometries: Advanced cooling channels, optimized flow passages and integrated features.
  • Safety-related but non-fuel components: Filtration elements, structural parts and debris mitigation solutions.
  • Tooling, jigs and auxiliary systems: Custom fixtures enabling safer and more efficient maintenance.
BLOG | ADDITIVE SNACK

The Silent Backbone: How Additive Manufacturing Is Re-Energizing the World’s Power Grids

Westinghouse uses AM to solve critical reliability challenges in nuclear plants, including advanced debris filters and bottom nozzles that boost filtration efficiency to over 95% without increasing pressure drop. At the same time, ExxonMobil reduces inventory tax through digital warehouses, enabling qualified parts to be printed on demand. Together, these initiatives show how AM is becoming a safety critical backbone for both nuclear operations and global energy supply chains.

Why EOS for Nuclear

With a strong history in mission-critical applications and deep expertise in metal additive manufacturing, EOS is a trusted partner for the nuclear industry. We support operators, suppliers and research institutes in safely adopting and scaling AM through:

  • Reliable, repeatable and certifiable metal AM production
  • Materials suitable for high-temperature, high-stress and corrosive environments
  • Support for qualification, testing and regulatory compliance
  • Decades of experience in aerospace, energy and other regulated sectors
  • Proven nuclear applications, including operating reactor components
  • A global ecosystem of partners providing end-to-end AM support

EOS enables nuclear operators to secure spare parts availability, extend lifecycle operations, improve system performance and build robust supply chains - essential for safe, reliable and sustainable nuclear energy generation.