Reaction of porous beryllium in steam

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Abstract
This report presents the findings of some additional investigations into the reaction of beryllium of approximately 88% theoretical density with steam. An earlier investigation had shown this material to be extremely reactive compared to dense beryllium. Inductively heated samples developed self-sustaining reactions due to the exothermic heat of reaction at temperatures between 600[degrees]C and 700[degrees]C. These initial tests did not completely explain the mechanisms causing this behavior. The onset of thermal instability appeared to have a temperature dependent incubation period and some dependence upon specimen geometry. Additional tests have clarified this behavior. We have also obtained measurements of emissivity and permeability. This information will be helpful in the future in modeling reactor accident scenarios. The high effective surface area of porous beryllium has also allowed reaction rates to be obtained at temperatures as low as 400[degrees]C. This information for porous beryllium was then used to extend relationships for the reaction rates of dense beryllium in steam to these lower temperatures.

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