This industry-first milestone increases bottom nozzle debris resistance from 65% to 96%
CRANBERRY TOWNSHIP, Pa., June. 26, 2024 – In an industry first, Westinghouse Electric Company used additive manufacturing (AM) to fabricate bottom nozzles that improve debris capture and fuel endurance within its fuel assemblies. The nozzles were integrated into four Lead Test Assemblies delivered to Alabama Power’s Joseph M. Farley Nuclear Plant operated by Southern Nuclear, in the first quarter of 2024.
Image of a Westinghouse fuel assembly bottom nozzle fabricated using additive manufacturing
Debris-wearing action on the fuel rod cladding – known as debris fretting – is the primary source of leaks in Pressurized Water Reactor (PWR) fuel assemblies. AM technology offers significant improvements in debris filtering thanks to enhanced design freedom which reduces the diameter of debris that can enter into the reactor. In testing, the additively manufactured components demonstrated a 30% improvement in debris resistance.
“Over the past decade, Southern Nuclear has led the industry in the development and implementation of new technologies that improve fuel resiliency,” said Southern Nuclear President Pete Sena. “The existing nuclear power fleet is the backbone of our country’s clean energy supply, and we are innovating nuclear fuel today to be more robust in order to deliver safer, more affordable and more reliable carbon-free clean nuclear power for decades to come.”
“Our additive manufacturing technology is allowing us to achieve breakthrough performance with an immediate positive impact for our customers,” said Tarik Choho, Westinghouse President of Nuclear Fuel. “This significant technology innovation for PWR reactors mitigates the risk of leakage in the fuel rods due to the accumulation of debris, strengthening the safety and efficiency of our customers’ operations.”
This milestone demonstrates Westinghouse’s leadership in the nuclear industry to achieve cutting-edge solutions using AM techniques. In 2015, the company conducted the first-ever material irradiation study of AM nuclear components. In 2020, Westinghouse installed the first-ever safety-related AM component, a Thimble Plugging Device, into an operating commercial reactor, and in 2024 Westinghouse produced the 1,000th Additive Manufacturing Component for VVER-440 Fuel.
