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A refractory material is one that retains its strength at high temperatures. ASTM C71 defines refractories as "non-metallic materials having those chemical and physical properties that made them applicable for structures, or as components of systems, that are exposed to environments above 1000 °F (800K, 500 °C)".

Such high temperatures are not met in water reactors, except in the fuel itself, which is in the form uranium dioxide. Is this what you mean? Some other types of reactors use high temperature gas for the coolant, though these are mostly experimental or prototypes at present. For example the pebble bed reactor uses fuel with the fissile material embedded in 'pebbles' of graphite, and in an inert helium atmosphere. In this case the graphite could be regarded as a refractory.

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Q: What is the type and specification of the Refractory used in Nuclear Power Plants and its source of supply and technology.?
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