Abstract
The basic structural design philosophy and criteria for reactor secondary containment shells is developed. Considering the several loading conditions to which the structure may be subjected, the range of allowable stresses as they relate to desired performance characteristics under various combinations of loadings is discussed. There are three general conditions under which the structure must meet appropriate stress criteria: as a long-term plant enclosure subjected to normal live and dead loads; as a protective structure for the nuclear steam supply system subjected to abnormal external loads and forces such as tornadoes, hurricanes, maximum possible earthquake, and missiles that might be generated by a tornado, turbine failure, or airplanes; and as a containment structure subjected to internal pressure and temperature as a result of a major rupture of the main coolant system.
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