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RELAP5-3D has become one of the most widely licensed software products within DOE

June 15, 2020

By INL Media Relations

100th Licensing Agreement signed for INL Software RELAP5-3D

Idaho National Laboratory’s Reactor Excursion and Leak Analysis Program5-3D (RELAP5-3D) reached a milestone this week when it signed its 100th active license agreement. The RELAP5-3D code is used primarily for analysis of potential accidents and transients in water-cooled nuclear power plants, and for analysis of advanced reactor systems.

Since it was first introduced in 1996, RELAP5-3D has become one of the most widely licensed software products within DOE. Use of the code has grown steadily, nearly doubling in the last five years, and continued growth is expected. Licensees, both international and domestic, include universities, government agencies, nuclear steam supply system providers and utilities with operating power plants.

RELAP5-3D sustains itself primarily with membership fees from the International RELAP Users Group (IRUG), which provides funding to continually upgrade and maintain this safety analysis code.



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Battelle Energy Alliance manages INL for the U.S. Department of Energy’s Office of Nuclear Energy. INL is the nation’s center for nuclear energy research and development, celebrating 75 years of scientific innovations in 2024. The laboratory performs research in each of DOE’s strategic goal areas: energy, national security, science and the environment. 

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Posted June 15, 2020

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