Type B Radioactive Material Packaging are required by federal regulation to provide containment of the radioactive materials being transported with an allowable release rate based upon the conditions and the material. Type B Packaging design incorporate a Containment Vessel (CV) which performs this function. CV designs typically have two separate seals, one that performs the content containment function and a second that is used to verify the installation and functionality of the containment seal. The Savannah River National Laboratory has designed the "Chalfant style" Containment Vessel, used on a family of Type B radioactive material packages, which utilizes a conical plug with dual O Rings which is held in contact by a threaded nut to a conical sealing surface on the vessel body. The "outer" O Ring is credited in the safety basis documents for providing containment. This paper discusses the challenges and benefits of crediting the "inner" O Ring of a Chalfant Style CV.
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