The Assessment Of Clay Buffers For
Isolating Highly Radioactive Waste
Author(s)
T. Yang, R. Pusch, S. Knutsson & L. Xiaodong
Abstract
Great effort is put into finding optimal buffer clays for isolating highly
radioactive waste (HLW) in countries utilizing nuclear energy. Different
materials are required to provide a hydrologically and mechanically suitable
surrounding of canisters with highly radioactive waste in repositories in
crystalline rock. For shallow disposal the high hydraulic conductivity of the rock
makes very dense smectite-rich clays necessary while for disposal in very deep
holes the primary desire is to use smectitic clays with a potential to resist high
temperatures. In both cases montmorillonite, with Al being a dominant lattice ion
in the octahedral layer, is suitable, but saponite with Mg as the dominant
octahedral constituent can be preferable for deep disposal. For both concepts the
use of smectitic mud is an option for supplying the buffer with water from start
and for controlling the hydration rate.
Keywords: high-level radioactive waste (HLW), HLW disposal in very deep
holes (VDH), buffer clay, hydration.
Keywords
high-level radioactive waste (HLW), HLW disposal in very deepholes (VDH), buffer clay, hydration.
Related Book
Other papers in this volume
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