Fire-resistant pit/Definition

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Fire-resistant pit [r]: A fire-resistant shell around the plutonium "pit" of a nuclear weapon, which will resist prolonged exposure to a jet fuel fire (at 1000 °C) without melting or being eaten through by the corrosive action of molten plutonium; the plutonium will not contaminate the area unless the shell is disrupted; on the B83 strategic bomb and W87 ICBM warhead