Argonne National Laboratory
Reduced Enrichment for Research and Test Reactors
Nuclear Science and Engineering Division at Argonne
U.S. Department of Energy


RERTR FUEL TESTS – As part of the advanced fuel development program for RERTR, fuel samples are being tested in Department of Energy's Advanced Test Reactor at Idaho National Laboratory.

The Reduced Enrichment for Research and Test Reactors (RERTR) Program develops technology necessary to enable the conversion of civilian facilities using high enriched uranium (HEU) to low enriched uranium (LEU) fuels and targets. The RERTR Program was initiated by the U.S. Department of Energy in 1978. During the Program's existence, more than 70 research reactors have been converted from HEU (= or >20% U-235) to LEU (< 20% U-235) fuels, nearly 30 additional reactors that used HEU have been verified as shutdown, and processes have been developed for producing radioisotopes with LEU targets. The RERTR Program is managed by the Office of Material Management and Minimization in the National Nuclear Security Administration (NNSA). The main technology components of the program are:

  1. the development of advanced LEU fuels,
  2. design and safety analysis for research reactor conversion, and
  3. development of targets and processes for the production of the medical isotope Molybdenum-99 with LEU.

Fuels for Research and Test Reactors

Design and Safety Analyses for Research and Test Reactors

Radioisotope Production

Reference Documents concerning the RERTR Program

RERTR International Meetings

2021 RERTR Meeting

RERTR-2021 International Meeting

The United States Department of Energy / National Nuclear Security Administration’s Office of Material Management and Minimization (M3) hosted the RERTR-2021 International Meeting on Reduced Enrichment for Research and Test Reactors on April 20-22, 2021.

Past RERTR International Meetings



RERTR Meeting Archive (1995-2004)

For the complete list of RERTR International Meetings, see RERTR International Meetings


See list of RERTR Program contacts


Mission Statement

The RERTR program mission supports the minimization and, to the extent possible, elimination of the use of HEU in civil nuclear applications by working to convert research reactors and radioisotope production processes to the use of LEU fuel and targets throughout the world.

2021 RERTR Meeting

The 2021 RERTR International Meeting (RERTR-2021) was held April 20-22, 2021.


Securing the world’s most vulnerable nuclear material
Image Credits: NNSA

Feb. 18, 2014 - Securing the world’s most vulnerable nuclear material
Argonne works to support President Obama’s vision of a world free of nuclear weapons through efforts to secure the world’s most vulnerable nuclear material and eliminate the use of high enriched uranium in civilian applications under the U.S. DOE Global Threat Reduction Initiative
Read more on Obama’s Four Year Effort » [5.2MB]


Useful Links



Past Meetings docs


The Nuclear Engineering Division at Argonne offers postdoctoral and student opportunities.


Argonne offers three Postdoctoral Fellowship Programs to outstanding doctoral scientists and engineers who are at early points in their promising careers. Please check our Postdoctoral Opportunities website for details about the Programs, a list of recent Postdoc Openings, contact information and more.



To find out about employment and internship opportunities visit our Students website.


The Nuclear Engineering Division Student Outreach Committee serves as a point of contact to student organizations and it also maintains regular communications with university nuclear engineering programs.
The Student Outreach website informs you about current committee activities and provides other information of interest to students.

ARGONNE NATIONAL LABORATORY, Nuclear Engineering Division, RERTR Department
9700 South Cass Ave., Argonne, IL 60439-4814
A U.S. Department of Energy laboratory managed by UChicago Argonne, LLC

Last modified on May 18, 2020