[en] Line 8''-WW-172-AB and related piping inside the LOFT containment and connected to penetration S-7A was analyzed to ASME Code, Subsection NC (Class 2) criteria. This piping is part of the Containment Isolation System. The model considered the piping from the containment I.D. inward through the second isolation valve. The analysis shows overstressed areas at the first, fourth, and fifth elbows from the penetration during the Safe Shutdown Earthquake. This stress may be relieved so that the line will meet Class 2 requirements if two restraints are added to the system