[en] Several sections of the LOFT primary coolant blowdown piping were analyzed for temperature transients occurring during a Loss of Coolant Experiment (LOCE). The LOCE fluid conditions were chosen to conservatively represent the most severe operating conditions occurring in the piping. Temperature gradients will be used by the Applied Mechanics Branch to determine thermal stresses and the allowable thermal cycles for the piping. The only other significant thermal cycle (heat-up or cooldown) was not analyzed because the DTs for this cycle for the pipe sections analyzed will be small (less than 15⁰F) and will have a very minor effect on the allowable number of thermal cycles. 8 inch-Sch 160, 10 inch-Sch 140, 12 inch-Sch 160, and a special 6 inch section of stainless steel piping were analyzed. The temperature gradients for each case were expressed in the DT form required for the ASME Section III pipe equations