Additive Manufacturing of Spacer Grids for Nuclear Reactors

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OPEN 2018
Pittsburgh, Pennsylvania
Project Term:
02/06/2019 - 08/05/2022

Technology Description:

Carnegie Mellon will combine its expertise in additive manufacturing (AM) with Westinghouse’s knowhow in nuclear reactor component fabrication to develop an innovative process for AM of nuclear components. The team chose to redesign nuclear reactor spacer grids as a test case because they are a particularly difficult component to manufacture. The role of spacer grids is to provide mechanical support to nuclear fuel rods within a reactor and reduce vibration as well as cause mixing of the cooling fluid. The team will alter the traditional AM process, including using nonstandard powders to optimize performance and reduce cost. If the project is successful, it could pave the way for other reactor components to be additively manufactured, enabling the rapid deployment of advanced reactors.

Potential Impact:

Carnegie Mellon’s process will inform the development of lower cost, safe, and secure advanced nuclear power plants.


The technology supports advanced manufacturing efforts to keep production in the U.S.


AM can substantially disrupt the nuclear vs. fossil fuel competitive landscape by reducing the cost of nuclear reactor components and increasing their performance. These advantages will positively impact energy-related emissions and energy efficiency.


The use of AM can potentially provide cost savings in fabricating next generation reactor components and replacement parts for legacy nuclear systems.


ARPA-E Program Director:
Dr. Jenifer Shafer
Project Contact:
Prof. Jack Beuth
Press and General Inquiries Email:
Project Contact Email:


Westinghouse Electric Company LLC

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