![]() Publication Date: Fri Jul 01 00:00: Research Org.: Sandia National Lab. BWRs, on the other hand, do experience high dry-well temperatures and have a higher potential for leakage. The results of this study, however, show that this conclusion does not hold for PWRs because in the worst accident sequence, the long time containment gases stabilize to 350/sup 0/F. Since other containments had similar electrical penetration assemblies, it was concluded that all containments would experience the same type of failure. Because of the high temperatures, it was postulated in the ORNL study that the sealants would fail and all the electrical penetration assemblies would leak before structural failure would occur. An accident sequence analysis conducted on a Boiling Water Reactor (BWR), Mark I (MK I), indicated very high temperatures in the dry-well region, which is the location of the majority of electrical penetration assemblies. These studies are directed towards assessing the risk and consequences of severe accidents. The leakage behavior of containments beyond design conditions and knowledge of failure modes is required for evaluation of mitigation strategies for severe accidents, risk studies, emergency preparedness planning, and siting. ![]()
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