Abstract
Many existing containments in the United States have been shown to accommodate credible severe accident loads. Future containments should be explicitly designed for severe accident loads to reduce the uncertainty associated with the response of containments to these low-probability events. This paper examines the experiences from the application of current structural design codes for concrete containments, ultimate pressure capacity evaluation of existing containments, and pressure fragility testing of scale model concrete containments to arrive at the directions for modification of national codes. Recommendations are provided to consider the severe accidents directly in the concrete containment design.
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