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IMC 0308 Attachment 3, Appendix J, "Technical Basis for Steam Generator Tube Integrity Findings."

• Some core damage sequences created by initiating events and equipment failures that have nothing to do with the SG tubes. The core damage sequences of concern are characterized by relatively high reactor coolant system pressure and dry SGs at the time that fuel cladding oxidation occurs in the reactor core. These conditions subject the SG tubes to temperatures well above design values. At these abnormal temperatures, the tube material is weaker, and tube ruptures may occur if the tube strength has been degraded during normal operation. The effect of tube degradation on these sequences is an increase in the probability that containment bypass will occur for accidents already included in the base core damage