This report presents an overview of the features that affect the sealing capability of radioactive material packagings currently certified by the U.S. Nuclear Regulatory Commission. The report is based on a review of current literature on seals, closures, and leakage f o r radioactive material packagings. Federal regulations that relate to the sealing capability of radioactive material packagings, as well as basic equations f o r leakage calculations and some of the available leakage test procedures are presented. The factors which affect the sealing capability of a closure, including the properties of the sealing surfaces, the gasket material, the closure method and the contents are discussed in qualitative terms. Information on the general properties of both elastomer and metal gasket materials and some specific designs are presented. A summary of the seal material, closure method, and leakage tests for currently certified packagings with large diameter seals is provided.
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