skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Hydrothermal reaction of simulated waste forms with basalt under conditions expected in a nuclear waste repository in basalt

Abstract

Simulated spent fuel, simulated defense high-level waste, and simulated and /sup 99/Tc-doped commercial high-level waste (PNL 76-68) were reacted with groundwater, both in the presence and absence of basalt, simulating expected conditions for a nuclear waste repository located in basalt in gold bag sampling autoclaves at temperatures between 90/sup 0/ and 300/sup 0/C, at 30 MPa pressure. During the course of the experiments, samples of the fluid phase were periodically withdrawn from the autoclaves and were analyzed for pH as well as major, minor, and trace cations and anions. At 200 and 300/sup 0/C, all dissolved species displayed either steady-state concentrations or decreasing concentrations after the first 1000 h. At 100/sup 0/C, some dissolved components had not reached steady-state concentrations after 6000 h. Solids characterization suggests that the formation of secondary alteration phases such as alkali feldspar, smectite clays, scapolite, and a variety of uranium-bearing silicate phases, imposes solubility limits on the release of many analog elements of potential radionuclides. These steady-state (or solubility) concentration limits can be coupled with measured hydrologic flow rates to calculate radionuclide release rates from the waste form for a nuclear waste repository in basalt. The experimentally determined steady-state concentrations of analog elements are comparedmore » to calculated solubilities for individual elements. In many cases, the experimentally determined concentrations are several orders of magnitude higher than the calculated solubility concentrations. Possible reasons for these discrepancies include invalid assumptions on stable alteration solids, temperature differences, and kinetic effects. The steady-state concentrations reported in this document provide realistic and defensibly conservative data that can be used on a preliminary basis for evaluating waste form performance both alone and in the presence of basalt.« less

Authors:
; ;
Publication Date:
Research Org.:
Rockwell International Corp., Richland, WA (USA). Rockwell Hanford Operations
OSTI Identifier:
6386041
Report Number(s):
RHO-BW-ST-59-P
ON: DE85007091
DOE Contract Number:  
AC06-77RL01030
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 54 ENVIRONMENTAL SCIENCES; BASALT; ROCK-FLUID INTERACTIONS; BOROSILICATE GLASS; LEACHING; WASTE FORMS; PERFORMANCE; EXPERIMENTAL DATA; GROUND WATER; HIGH-LEVEL RADIOACTIVE WASTES; HYDROTHERMAL ALTERATION; SPENT FUEL ELEMENTS; TECHNETIUM 99; TEMPERATURE EFFECTS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; DATA; DISSOLUTION; FUEL ELEMENTS; GLASS; HOURS LIVING RADIOISOTOPES; HYDROGEN COMPOUNDS; IGNEOUS ROCKS; INFORMATION; INTERMEDIATE MASS NUCLEI; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; MATERIALS; NUCLEI; NUMERICAL DATA; ODD-EVEN NUCLEI; OXYGEN COMPOUNDS; RADIOACTIVE MATERIALS; RADIOACTIVE WASTES; RADIOISOTOPES; REACTOR COMPONENTS; ROCKS; SEPARATION PROCESSES; TECHNETIUM ISOTOPES; VOLCANIC ROCKS; WASTES; WATER; YEARS LIVING RADIOISOTOPES; 052002* - Nuclear Fuels- Waste Disposal & Storage; 053000 - Nuclear Fuels- Environmental Aspects; 520301 - Environment, Aquatic- Radioactive Materials Monitoring & Transport- Water- (1987)

Citation Formats

Myers, J., Apted, M.J., and Mazer, J.J. Hydrothermal reaction of simulated waste forms with basalt under conditions expected in a nuclear waste repository in basalt. United States: N. p., 1984. Web.
Myers, J., Apted, M.J., & Mazer, J.J. Hydrothermal reaction of simulated waste forms with basalt under conditions expected in a nuclear waste repository in basalt. United States.
Myers, J., Apted, M.J., and Mazer, J.J. Thu . "Hydrothermal reaction of simulated waste forms with basalt under conditions expected in a nuclear waste repository in basalt". United States.
@article{osti_6386041,
title = {Hydrothermal reaction of simulated waste forms with basalt under conditions expected in a nuclear waste repository in basalt},
author = {Myers, J. and Apted, M.J. and Mazer, J.J.},
abstractNote = {Simulated spent fuel, simulated defense high-level waste, and simulated and /sup 99/Tc-doped commercial high-level waste (PNL 76-68) were reacted with groundwater, both in the presence and absence of basalt, simulating expected conditions for a nuclear waste repository located in basalt in gold bag sampling autoclaves at temperatures between 90/sup 0/ and 300/sup 0/C, at 30 MPa pressure. During the course of the experiments, samples of the fluid phase were periodically withdrawn from the autoclaves and were analyzed for pH as well as major, minor, and trace cations and anions. At 200 and 300/sup 0/C, all dissolved species displayed either steady-state concentrations or decreasing concentrations after the first 1000 h. At 100/sup 0/C, some dissolved components had not reached steady-state concentrations after 6000 h. Solids characterization suggests that the formation of secondary alteration phases such as alkali feldspar, smectite clays, scapolite, and a variety of uranium-bearing silicate phases, imposes solubility limits on the release of many analog elements of potential radionuclides. These steady-state (or solubility) concentration limits can be coupled with measured hydrologic flow rates to calculate radionuclide release rates from the waste form for a nuclear waste repository in basalt. The experimentally determined steady-state concentrations of analog elements are compared to calculated solubilities for individual elements. In many cases, the experimentally determined concentrations are several orders of magnitude higher than the calculated solubility concentrations. Possible reasons for these discrepancies include invalid assumptions on stable alteration solids, temperature differences, and kinetic effects. The steady-state concentrations reported in this document provide realistic and defensibly conservative data that can be used on a preliminary basis for evaluating waste form performance both alone and in the presence of basalt.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {3}
}

Technical Report:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that may hold this item. Keep in mind that many technical reports are not cataloged in WorldCat.

Save / Share: