Key Accomplishments• The project team met at PNNL for a joint working group meeting with the interna- tional Hillfort team to discuss results and develop a consensus for a path forward.• All participating organizations have initiated testing and analysis is currently underway.• Work conducted under this program was presented at the 2016 Materials Research Society Fall Meeting in Boston, MA and a paper was submitted.

Key Benefits• The EPA-1313 and EPA-1315 tests are already EPA approved and minor modifica- tions can be made to these test protocols to adapt their use for glass.• The existing requirements for a glass to be disposed of at IDF include that it be tested with the vapor hydration test and the product consistency test, both of which are conducted at elevated temperatures (200°C and 90°C, respectively). However, the results from these tests show inconsis- tencies when extrapolated to or conducted at low temperatures, near that expected at the IDF (~15°C). The EPA tests might help provide more insight to how glass behaves in an aqueous environment at near room temperature.

Ana M. Han ana.han@em.doe.gov 202-586-0579

Rodrigo (Rod) V. Rimando, Jr. rodrigo.rimando@em.doe.gov 202-287-1348

Technical SummaryThis project is focused on evaluating the e�cacy of using chemical durability tests approved by the Environmental Protection Agency (EPA) to evaluate immobilized low-activity waste (ILAW) glass that will be disposed in the Hanford Integrated Disposal Facility (IDF). The tests that are being evaluated are EPA-1313, which is an agitated test run on powdered or granular materials over a pH range of 2 ≤ pH ≤ 13 and EPA-1315, which is a static test that is run on monolithic or compacted granular materials. This is the �rst time these tests have been evaluated for glassy waste forms. Two glasses, LAW-A44 and ORP-LB2, were fabricated in bulk by PNNL and are being evaluated by PNNL, Vanderbilt, and She�eld using both EPA-1313 and EPA-1315 tests. The results of these tests will be included within the public comments section in the Federal Register in the Spring of 2017 as an addendum to the existing usage of these procedures for application to glass.

Path Forward• Complete EPA-1313 and EPA-1315 tests at all labs for both glasses (LAW-A44 and ORP-LB2).• Compare leachate data for both glasses and both tests between laboratories.• Compare EPA test results to other standardized tests on same glasses.• Estimate release rates based on EPA tests.• Conduct mechanistic evaluation of data obtained through the EPA tests.• Evaluate these tests on additional glasses.• Identify strengths and weakness of EPA tests.

Glass Leaching Assessment forDisposability (GLAD)PARTNERS

For more informationon this project or theEM International Program

U.S. DOE OFFICE OF ENVIRONMENTAL MANAGEMENT INTERNATIONAL PROGRAMH I G H L I G H T S O F F I S C A L Y E A R 2 0 1 6 P R O J E C T S

University of Sheffield

Pacific Northwest National Laboratory (PNNL)Vanderbilt University (VU) Pictures of the LAW-A44 glass monoliths near the containers (top)

and zoomed-in view (bottom) that were prepared for EPA-1315 tests conducted at PNNL.