Abstract
AbstractIn the Canadian Nuclear Fuel Waste Management Program, metals and alloys with low melting points are being evaluated for their potential application as cast matrices within used-fuel immobilization containers. Since a high integrity matrix is essential to ensure adequate internal support to the container shell under pressure and temperature conditions anticipated within an underground disposal vault, an extensive casting development program has been undertaken at the Whiteshell Nuclear Research Establishment. The program includes theoretical solidification model development supplemented by casting experiments that employ both unidirectional and multidirectional cooling of small and halfscale prototype containers.Experimental data obtained from the lead casting experiments were compared with model predictions and excellent agreement was obtained. Multidirectional cooling decreases the total solidification time by a factor of two and a half, compared to unidirectional cooling. The techniques develop...
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