Vitrification of high level wastes [electronic resource] : a review of the computer thermal analyses for storage canisters

Published:: Columbus, Ohio : Battelle Memorial Institute, 1979.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: Pages: 36 : digital, PDF file
Additional Creators:: Battelle Memorial Institute and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

CANIST, a two-dimensional (r and THETA) computer program that solves the unsteady-state, heat conduction equation was used to model the thermal behavior of canisters filled with waste glass. CANIST has been found to be a valuable analytical tool for predicting the temperature profile of a waste storage canister as a function of several variables, including the diameter of the canister, the placement of internal fins, the heat generation rate of the waste glass, and the thermophysical properties of the canister and the waste glass. Thus, temperature dependent processes that may affect the integrity of the glass/canister unit, for example cracking, can be investigated using an analytical approach. In the present study, the canister temperature profiles predicted by CANIST were compared to canister temperatures measured during full-scale non-radioactive waste immobilization tests conducted at Pacific Northwest Laboratory. The agreement between experimental and predicted temperatures was good, particularly considering the fact that the thermophysical properties of the waste glass modeled have not yet been accurately determined. Examination of some glass-filled canisters has revealed cracking to have occurred in the glass. However, the comparison between measured and CANIST predicted temperatures suggests that cracking does not significantly influence the heat-transfer process. CANIST was also used to evaluate different ways of reducing the centerline temperature of a canister, and to predict the centerline temperature as a function of the heat generation rate of the waste glass and the type of interim storage, i.e., air or water.

Report Numbers:

E 1.99:pnl-sa-7917
E 1.99: conf-790822-17
conf-790822-17
pnl-sa-7917

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Note:

Published through SciTech Connect.
08/01/1979.
"pnl-sa-7917"
" conf-790822-17"
87. AICHE national meeting, Boston, MA, USA, 19 Aug 1979.
Slate, S.C.; Wescott, R.I.

Funding Information:

AC06-76RL01830

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