Simplified containment event tree analysis for the Sequoyah Ice Condenser containment

Abstract

SECY-88-147, dated May 25, 1988, presented the NRC staff's program pian to evaluate generic severe accident containment vulnerabilities via the Containment Perfonn_ce Improvement Program (CPIP). This effort was predicated on the presumption that there are generic severe accident challenges for each light water reactor (LWR) containment type that should be addressed _odetermine whether ad.. ditional regulatory guid,'mce or requirements concerning needed containment features are warranted, and to coxffirm the adequency of the existing Commission policy. These challenges should be addressed to determine the possible need for additional regulatory guidance or requirements related to contaimnent features. The ability of contairtments to successfully survive some severe accident challenges is uncertain, as indicated in Draft NUREG-1150. The CPI effort is intended to focus on evaluation of hardware and procedural issues related to generic containment challenges. This report documents the results of NRC-sponsored research related to severe accident challenges and potential enhancements that could improve contaimnent performance. The purpose of this report is to provide PWR Ice Condenser owners with information they may find useful in assessing their plants as part of their Individual Plant Examination (IPE) program. No requirements are contained in this report and it is being provided tbr information only. Specific guidance to the industry on the use of this report, and similar reports has been given in Generic Letter 88-20, Supplement 3, dated