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Beryllium Technology Research in the United States

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Beryllium Technology Research in the United States INL/CON-05-00920 PREPRINT Beryllium Technology Research in the United States 7th IEA International Workshop on Beryllium Technology Glen R. Longhurst Robert A. Anderl M. Kay Adler-Flitton Gretchen E. Matthern Troy J. Tranter Kendall J. Hollis February 2005 This is a preprint of a paper intended for publication in a journal or proceedings. Since changes may not be made before publication, this preprint should not be cited or reproduced without permission of the author. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, or any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for any third party’s use, or the results of such use, of any information, apparatus, product or process disclosed in this report, or represents that its use by such third party would not infringe privately owned rights. The views expressed in this paper are not necessarily those of the United States Government or the sponsoring agency. BERYLLIUM TECHNOLOGY RESEARCH IN THE UNITED STATES GLEN R. LONGHURST*, ROBERT. A. ANDERL, M. KAY ADLER-FLITTON, GRETCHEN E. MATTHERN, TROY J. TRANTER, Idaho National Laboratory, P.O. Box 1625, Idaho Falls, Idaho, 83415 USA KENDALL J. HOLLIS Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545 USA ABSTRACT It was discovered in 1999 that irradiated beryllium While most active research involving beryllium in the disposed of at the RWMC was corroding with attendant 14 2 United States remains tied strongly to biological effects, release of tritium and C. In 2001, it was found that there are several areas of technology development in the beryllium irradiated in the Advanced Test Reactor (ATR), last two years that should be mentioned. (1) Beryllium and by inference in most fission reactors, required disposed of in soil vaults at the Idaho National Laboratory classification as Transuranic Waste. Under U.S. (INL) Radioactive Waste Management Complex (RWMC) environmental law, such material could not be disposed of has been encapsulated in-situ by high-temperature and in existing repositories for radioactive waste, and an pressure injection of a proprietary wax based material to exploration of processing techniques has been initiated. inhibit corrosion. (2) A research program to develop a Fusion reactors are planned that make use of process for removing heavy metals and cobalt from beryllium in two ways. One use is as a low-atomic-number irradiated beryllium using solvent extraction techniques has plasma-facing material with excellent oxygen gettering been initiated to remove components that prevent the capabilities. The other potential use is as Flibe coolant and beryllium from being disposed of as ordinary radioactive tritium source in breeding blanket designs. Production of waste. (3) The JUPITER-II program at the INL Safety and such beryllium plasma-facing components and control of Tritium Applied Research (STAR) facility has addressed the tritium in the Flibe are motivations for some of the work REDOX reaction of beryllium in molten Flibe (a mixture of reported here. LiF and BeF2) to control tritium, particularly in the form of HF, bred in the Flibe by reactions involving both beryllium II. ENCAPSULATION OF BURIED Be WASTE and lithium. (4) Work has been performed at Los Alamos National Laboratory to produce beryllium high heat flux Beryllium waste in the RWMC Subsurface Disposal components by plasma spray deposition on macro- Area contains tritium from neutron activation of beryllium. roughened substrates. Finally, (5) corrosion studies on This waste is buried at depths of 6 m or less. As the buried beryllium samples at the RWMC have shown that the beryllium corrodes, tritium is released into the surrounding physical form of some of the corroded beryllium is very soil as gas or water vapor. A beryllium encapsulation filamentary and asbestos-like. project has been conducted at the INL to prevent further corrosion of the beryllium by keeping water away from it.3 KEYWORDS: beryllium, disposition, transmutations, Known and suspected beryllium disposal areas were transuranic, flibe, plasma spray, disease surveyed for tritium at soil depths of 15.2 cm and 61 cm below ground surface. Tritium anomalies were used to I. INTRODUCTION identify sites needing treatment. In situ high-pressure jet grouting was used to isolate By far, the greatest expenditures for research in the the beryllium blocks without removing them from their United States involving beryllium has been in the realm of burial location. In addition to preventing water from biological effects. Weitzman estimated in 2003 that reaching the blocks, this technique reduces migration of research opportunities for beryllium health and safety contaminants (primarily C-14) from the beryllium blocks research were approximately $14.6 million.1 In contrast, and reduces subsidence potential to prevent pooling of work performed in development of beryllium technology water. It will be repairable if isolation is breached, and it combined was much less. Most of the technology will allow future retrieval if required. development activity was connected with management of Several potential grouts were tested and compared irradiated beryllium wastes. based on the required criteria of effectiveness and ease of application. The conclusion was that the paraffin-based 4 *E-mail: [email protected] grout WAXFIX was superior to other grouts tested. WAXFIX is a proprietary grout available from Carter Technologies Co. in Houston, Texas. It has a melting point and 235 mCi/g of 3H from activation of the beryllium of about 51.7qC and a specific density of about 0.8. itself.6 A private company was awarded the contract to A small research program has been initiated to provide the required equipment and services. The major evaluate techniques for removing these contaminants from pieces of equipment used in jet grouting beryllium blocks irradiated beryllium such that the beryllium can be disposed included: of as ordinary radioactive waste. Recycling is not a current • Grout containment units (GCUs), which contained the objective. The separated radioactive metals may then be potentially contaminated returns from the jet grouting disposed of separately in a high-level waste repository or process burned away in a fission reactor. • Drill rig, which performed the drilling and jet grouting The research performed in the first year has shown operations that beryllium can be successfully dissolved in nitric acid • High-pressure pump, which supplied the grout to the and that isotopes of Cs, Sr, Pu, and Am can be successfully drill rig at high pressure removed using a combination of two solvent extraction • Grout truck, which transported hot WAXFIX from the approaches.7 The results indicate that greater than 99.9% storage site to the drilling site. removal can be achieved for each isotope with only three Holes were drilled through the GCUs to a depth below contact stages. Increasing the number of extraction stages the bottom of the beryllium in an array configured to get should provide even greater removal efficiencies. full penetration of the region containing the buried Work will continue in the next year to develop a beryllium. The pump supplied grout at 500 bar and more suitable technique for 60Co removal. Column supported than 90qC. Prior testing had shown the extent of penetration dimethyl glyoxime will be investigated for this purpose as of the hot grout in the soil. After injection for a well as several ion exchange approaches. Work will also predetermined time through the drill, the drill rig was raised continue with the target isotopes mentioned above to by a few cm, and the process was repeated until it got near investigate the possibility of using a combination of the surface. extraction chromatography and ion exchange to provide an Among the problems encountered was the quantity of alternative approach to solvent extraction for removing grout and soil returned to the surface during grouting these isotopes. operations. A number of solutions were considered, but the problem was dealt with by cleaning out the GCUs with a IV. TRITIUM IN FLIBE backhoe. Other problems, such as vibrating the nozzles out of the monitor while drilling and breaking of drill rods, also Much of the beryllium in some fusion reactor designs were encountered and solved. The project took 11 months will be in molten salt. Flibe, a mixture of LiF and BeF2, is to complete. In all, 512 holes were drilled and grouted. being considered as a coolant for breeding blankets with the added capability of breeding some tritium. The JUPITER-II III. REMOVAL OF HEAVY METALS AND COBALT program is supporting research on Flibe at the Safety and Tritium Applied Research (STAR) facility at the Idaho During routine activation calculations on beryllium National Laboratory. Safety and performance issues arising used as neutron reflectors in fission reactors, it was from the corrosive properties of TF, produced in the Flibe discovered that uranium impurity concentrations of only a by neutron transmutation and chemical composition, are few mg/kg could result in the waste being classified as being investigated. transuranic (TRU), having more than 100 nCi/g of A REDOX process has been developed for controlling radioactive elements with atomic numbers greater than 92 pH in the Flibe using sacrificial beryllium to react with the and half-lives greater than 20 years. Such waste presently TF. Recent experiments have examined the dissolution rate has no pathway for disposal in the U.S. Analyses and of beryllium in the molten Flibe as a function of various measurements on beryllium from the Advanced Test flow and chemical parameters. A further goal is to Reactor at the INL confirmed concentrations of heavy understand the mechanisms by which beryllium is metals that were about five times the threshold for TRU transported in the molten salt after dissolution and how and classification.5 Additionally, iron and cobalt impurities where it interacts with the TF.
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