Studies of creep behaviour in structures that operate at elevated temperatures such as nuclear power plants are important for structural integrity assessments. The effect of plastic pre-strain can significantly affect the creep deformation of a component. Therefore, it is necessary to fully understand the effect to incorporate it into high-temperature lifetime assessments. The object of the proposed SANS experiment is to quantify the amount of creep cavitation damage as a function of creep strain for specimens made from virgin 316H stainless steel material having undergone different amounts of pre-strain. This will provide information on the mechanism of creep cavity formation in pre-strained specimens.