Effect of heating temperature on tritium retention in stainless steel type 316 L

•Effects of heating temperature on tritium retention behaviur have been studied using SS316L samples as a model.•Tritium retention behaviur strongly depended on degassing temperature as well as tritium exposure temperature.•Significant increase in tritium retention appeared in a degassing temperature region above 573 K.•Tritium retention behaviur in the plasma-exposed sample was similar to that in the plasma non-exposed samples.•Changes in chemical states of sample surface with heating were consistent with the tritium retention behaviur.