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

Home  :: 1995 International RERTR Meeting Program  :: Related Documents

Abstracts and Available Papers Presented at the
1995 International RERTR Meeting


D. Dong and G. F. Vandegrift
Argonne National Laboratory
Argonne, Illinois U.S.A.

S. Amini, J. B. Hersubeno, H. Nasution, and Y. Nampira
Indonesian National Atomic Energy Agency
Serpong, Indonesia

Presented at the1995 International Meeting on
Reduced Enrichment for Research and Test Reactors
September 18-21, 1995
Paris, France

*Work supported by the US Department of Energy
Office of Nonproliferation and National Security
under Contract No. W-31-109-38-ENG.


In FY 1995, we started studies on a new process for dissolution of low-enriched uranium (LEU) targets for Mo-99 production. In this process, an LEU metal foil target is dissolved in a mixture of sodium hydroxide and hydrogen peroxide, then Mo-99 is recovered from the dissolved solution. We focused on the dissolution kinetics to develop a mechanistic model for predicting the products and the rate of uranium dissolution under process conditions. We thoroughly studied the effects of hydrogen peroxide concentration, sodium hydroxide concentration, and temperature on the rate of uranium dissolution.

It was found that uranium dissolution can be classified into a low-base (<0.2 M) and a high-base (>0.2M) process. In the low-base process, both the equilibrium hydrogen peroxide and hydroxide concentrations affect the rate of uranium dissolution; in the high base process, uranium dissolution is a 0.25th order reaction with respect to the equilibrium hydrogen peroxide. The dissolution activation energy was experimentally determined to be 48.8 kJ/mol. Generally, the rate of uranium dissolution increases to a maximum as the hydroxide concentration is increased from 0.01 to about 1.5M, then it decreases as the hydroxide concentration is further increased. The alkalinity of the dissolution solution is an important factor that affects not only the dissolution rate, but also the amount of radioactive waste.

PDF version available
DOWNLOAD full paper in PDF format.

George F. Vandegrift
Department Head, Process Chemistry and Engineering
Argonne National Laboratory
9700 South Cass Avenue
Argonne, IL 60439 USA

Phone:   (630) 252-4513
Fax:        (630) 252-4513

2016 RERTR Meeting

The 2016 International RERTR Meeting (RERTR-2016) will take place in Belgium. Stay tuned for further details.

2015 RERTR Meeting

The 2015 International RERTR Meeting (RERTR-2015) took place in Seoul, Korea on Oct. 11-14, 2015.
For more information visit RERTR-2015.


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 July 29, 2008 11:33 +0200