Ten thin-walled Type-304 stainless-steel-clad fuel rods were irradiated as part of the Saxton core to a maximum burnup of 8900 MWd/t at a maximum heat flux of 410 000 Btu/(h ft2) (129 W/cm2). The corresponding integrated fast flux exposure ( > 1 MeV) was 1.1 x 1021 n/cm2. Postirradiation examinations revealed no evidence of failure or crack formation, although the thin-walled clad was subjected to plastic deformation. The experiment demonstrated satisfactory performance of stainless steel in a borated PWR environment.