Background: It is very important to ensure the integrity of the reactor pressure vessel under core melt down accident.The high-temperature creep failure is the main failure mode of the reactor pressure vessel under core melt down accident.Purpose: This paper is to present an overview of research status and progress on high-temperature creep behavior of reactor pressure vessel considering the hypothetical core melt down scenario.Methods: Emphasis is placed on accomplished achievements in creep tests

scale model experiments and numerical simulation

and the domestic newly research productions on high-temperature creep behavior of reactor pressure vessel structure integrity.Conclusions: This paper also discusses the limitations of existing researches and indicates future research directions

such as multi-axis tensile tests

analysis of three-dimensional coupling temperature field

scaled model tests

and so on.