The Predicted And Actual Wetting Rate Of
The Buffer In Repositories For High-level
Radioactive Waste
Author(s)
R. Pusch, G. Ramqvist & S. Knutsson
Abstract
Underground test sites for the disposal of high-level radioactive waste (HLW)
are commonly equipped with instrumentation for documentation of the evolution
of engineered barriers and of changes in the physical state of the host rock. The
rate of hydration of the clay buffer surrounding waste canisters determines the
physical interaction with the rock and waste canisters and is recorded by use of
RH meters and by measuring the swelling pressure exerted on cells installed in
the clay. They are connected to cables and tubings extending to the recording
units placed in room atmosphere. If they pass from the rock through the buffer
groundwater under pressure can migrate through or along bunches of cables and
tubings and reach the points of measurement earlier than in clay without
instrumentation. The inconvenience is avoided by tight embedment of individual
cables and tubings and placement of the pressure gauges such that they do not
pass through the clay. Incorrect rates of hydration has led to the inadequate
conclusion that water flows in unsaturated parts of the buffer according Darcy’s
law while it is in fact migrating by coupled diffusion processes.
Keywords: buffer, cables, instrumentation, pressure sensors, thermocouples,
tubings.
Keywords
buffer, cables, instrumentation, pressure sensors, thermocouples,
tubings.
Related Book
Other papers in this volume
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