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High-level waste-basalt interactions. Annual progress report, February 1, 1977--September 30, 1977

Description: Commercial radioactive waste can be placed under ground in a basalt repository to contain significant amounts of radioactive decay heat for the first hundred or so years, which constitutes the ''thermal period'' of waste isolation, if the feasibility is determined that a basalt geology is a suitable medium for storage of radioactive wastes. Several physical-chemical changes analogous to natural geochemical processes can occur in and around this repository during the thermal period. The waste ca… more
Date: May 1, 1978
Creator: McCarthy, G.J. & Scheetz, B.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Reactivity of a tuff-bearing concrete: CL-40 CON-14

Description: Samples of a tuff-bearing concrete have been altered in J-13 groundwater and in the vapor phase over deionized water at 200{degree}C. Crushed and intact discs of the concrete have been studied. The glassy tuff component of the tuff was more extensively reacted than the welded devitrified tuff. The original concrete was formulated to be expansive on curing through the formation of the calcium alumino-sulfate hydrate phase, ettringite. An x-ray diffraction examination of the altered crushed sampl… more
Date: April 1989
Creator: Scheetz, B. E. & Roy, D. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Numerical modeling of a thermohydrochemical (T-H-C) coupling and the implications to radionuclide transport.

Description: Thermohydrochemical (T-H-C) processes result from the placement of heat-generating radioactive materials in unsaturated, fractured geologic materials. The placement of materials in the proposed Yucca Mountain repository will result in complex environmental conditions. Simple models are developed liking the thermohydrological effects simulated with TOUGHZ to system chemistry, with an example presented for chloride. Perturbations to near-field chemistry could have a significant impact on the migr… more
Date: September 21, 1999
Creator: Esh, D. W. & Scheetz, B. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Hydrothermal interactions of cesium and strontium phases from spent unreprocessed fuel with basalt phases and basalts

Description: This investigation is a segment of an extensive research program aimed at investigating the feasibility of long-term, subsurface storage of commercial nuclear waste. Specifically, it is anticipated that the waste will be housed in a repository mined from the basalt formations which lie beneath the Hanford Site. The elements monitored during the present experiments were Cs and Sr. These two elements represent significant biohazards if released from a repository and are the major heat producing r… more
Date: March 1, 1980
Creator: Komarneni, S.; Scheetz, B.E.; McCarthy, G.J. & Coons, W.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Reaction of water with a simulated high-level nuclear waste glass at 300/sup 0/C, 300 bars

Description: The hydrothermal stability of high-level nuclear wastes is an important consideration in establishing waste form acceptance criteria for a geological repository in basalt. A detailed examination of the stability of a typical simulated high-level waste glass and pressurized water at 300/sup 0/C in a closed system has shown that extensive reaction occurred within a few weeks. The water acted first as a catalyst-solvent in devitrification of the glass and in dissolution, transport, and recrystalli… more
Date: October 20, 1978
Creator: McCarthy, G. J.; Scheetz, B. E.; Komarneni, S. & Smith, D. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Simulated high-level waste-basalt interaction experiments. Annual progress report, October 1, 1977--September 30, 1978

Description: Reconnaissance experiments suggested that the observed reactivity of calcine and glass as 300/sup 0/C would be anticipated at lower temperatures but only after longer times of hydrothermal treatment. Long-duration experiments at 100/sup 0/ and 300/sup 0/C were initiated to determine the time dependence of the alterations at lower temperatures. The reconnaissance experiments also suggested that equilibrium conditions were not yet achieved in these closed system experiments. Glass was observed to… more
Date: November 1, 1978
Creator: Scheetz, B. E.; Smith, D. K.; Barnes, M. W.; Komarneni, S.; Stull, L. M. & Smith, C. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Ceramic phases for immobilization of /sup 129/I. [Sodalite and boracite]

Description: Materials for ultimate disposal of /sup 129/I have been studied. At present, iodide-sodalite, though not ideal, appears to be the best material for /sup 129/I immobilization from the aspects of ease of preparation, thermal stability, cost of materials, and leach resistance. Good consolidation of the material was achieved by sintering in air at 1000 to 1200/sup 0/C, but the iodine content was significantly below stoichiometric expectations. Hot aqueous media preferentially removed iodine, appare… more
Date: July 31, 1981
Creator: Vance, E. R.; Agrawal, D. K.; Scheetz, B. E.; Pepin, J. G.; Atkinson, S. D. & White, W. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Simulated high-level waste-basalt interaction experiments. First interim progress report

Description: Reconnaissance experiments have shown that waste/basalt interactions are of real importance in understanding all aspects of total containment of radionuclides in a basalt repository. It has been shown that the reprocessed waste forms, calcine and glass, are relatively more reactive than the more crystalline waste forms, spent unreprocessed fuel (SURF) and supercalcine. These experiments have established the direction of future research. The remainder of the program will be concerned with longer… more
Date: March 24, 1978
Creator: McCarthy, G. J.; Scheetz, B. E.; Komarneni, S.; Barnes, M.; Smith, C. A.; Lewis, J. F. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Determination of the Structure of Vitrified Hydroceramic/CBC Waste Form Glasses Manufactured from DOE Reprocessing Waste

Description: The selection of a glass-making option for the solidification of nuclear waste has dominated DOE waste form programs since the early 1980's. Both West Valley and Savannah River are routinely manufacturing glass logs from the high level waste inventory in tank sludges. However, for some wastes, direct conversion to glass is clearly not the optimum strategy for immobilization. INEEL, for example, has approximately 4400 m{sup 3} of calcined high level waste with an activity that produces approxima… more
Date: May 31, 2005
Creator: Scheetz, B.E.; White, W. B.; Chesleigh, M.; Portanova, A. & Olanrewaju, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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