Nuclear Nonproliferation: DOE Needs to Take Action to Further Reduce the Use of Weapons-Usable Uranium in Civilian Research Reactors.
GAO-04-807 July 30, 2004
Nuclear research reactors worldwide use highly enriched uranium Enriched uranium is a sample of uranium in which the percent composition of uranium-235 has been increased through the process of isotope separation. Natural uranium is 99.284% 238U isotope, with 235U only constituting about 0.711 % of its weight. (HEU HEU Highly Enriched Uranium
HEU Hospital Employees Union
HEU Higher Echelon Unit ) as fuel and for the production of medical isotopes. Because HEU can also be used in nuclear weapons, the Department of Energy's (DOE) Reduced Enrichment for Research and Test Reactors program is developing low enriched uranium (LEU), which would be very difficult to use in weapons, to replace HEU. To date, 39 of the 105 research reactors in the United States United States, officially United States of America, republic (2005 est. pop. 295,734,000), 3,539,227 sq mi (9,166,598 sq km), North America. The United States is the world's third largest country in population and the fourth largest country in area. and abroad targeted by DOE have converted to LEU fuel. GAO was asked to examine (1) the status of the remaining research reactors in converting to LEU fuel, (2) DOE's progress in developing new LEU fuels for reactors where conversion is not yet technically feasible, (3) DOE's progress in developing LEU for the production of medical isotopes, and (4) the status of DOE and Nuclear Regulatory Commission Nuclear Regulatory Commission (NRC), an independent U.S. government commission, created by the Energy Reorganization Act of 1974 and charged with licensing and regulating civilian use of nuclear energy to protect the public and the environment. (NRC NRC
1. National Research Council
2. Nuclear Regulatory Commission
Noun 1. NRC - an independent federal agency created in 1974 to license and regulate nuclear power plants ) efforts to improve security at research reactors.
Currently, conversion to LEU fuel is technically feasible for 35 of the 66 research reactors in DOE's program that still use HEU fuel, but most do not have plans to convert. In the United States, 8 research reactors, including 6 university research reactors, have not converted because DOE has not provided the necessary funding. Of the 20 foreign research reactors that use U.S.-origin HEU fuel, 14 do not have plans to convert because they have a sufficient supply of HEU fuel and either do not want to incur the additional cost of conversion or do not have the necessary funding. Finally, only 1 of 7 Russian-supplied research reactors that could use LEU fuel is scheduled to convert. Conversion to LEU fuel is not technically feasible for 31 research reactors worldwide that still use HEU fuel. DOE has experienced technical setbacks in fuel development that have postponed the conversion of the 31 reactors until 2010 at the earliest. One fuel failed unexpectedly in testing, and DOE may cancel further development, depending on the results of additional tests. Initial testing of another LEU fuel produced positive results, but additional testing is required and the fuel will not be developed until 2010 at the earliest. Separately from the development of LEU fuel, DOE is developing LEU to replace HEU in the production of medical isotopes. DOE has not yet completed the work that would enable conversion of large-scale medical isotope isotope (ī`sətōp), in chemistry and physics, one of two or more atoms having the same atomic number but differing in atomic weight and mass number. The concept of isotope was introduced by F. production to LEU. One reactor has converted to LEU for smallscale production. However, large-scale producers are concerned that the cost of converting to LEU could be prohibitive. DOE and NRC have taken steps to improve security at foreign and U.S. research reactors. While operators at most research reactors we visited said that security had been upgraded through DOE or NRC efforts, we observed areas where further improvements could be made. Recognizing the possible need for further improvements, DOE and NRC are engaged in separate efforts to assess and improve security.