[en] Two tees in the LOFT primary coolant blowdown piping were analyzed for temperature transients occurring during a Loss of Coolant Experiment (LOCE). The surface heat transfer coefficients and boundary temperatures were conservatively chosen to represent the most severe conditions occurring in the tees during a LOCE. Temperature gradients will be used by the Applied Mechanics Branch to determine thermal stresses and the allowable thermal cycles for the piping. Only a LOCE thermal cycle was analyzed because the only other significant thermal cycles (heatup or cooldown) will generate small DT's and will have a minor effect on the allowable number of thermal cycles. The tees are machined from blocks of stainless steel. A two-dimensional cross section of each tee was analyzed and chosen so as to result in the most severe temperature gradients (i.e., where the greatest material thickness exists). The temperature gradients for each case were expressed in the DT form required for the ASME Section III pipe equations. DT values are tabulated in the report and have been forwarded to the Applied Mechanics Branch for stress analysis. Specific details and assumptions used in this analysis are found in appropriate sections of this report