Stability:

Stability of a material refers to its chemical and mechanical inertness under the conditions to that it will be subjected. Nuclear plants must have a multiplicity of environments to that materials are subjected. A few of these environments, like as high temperatures, high radiation, high acid, and high pressure, could be considered extreme and harsh; thus, the stability of the materials associated for service in these areas is a main consideration.

Corrosion mechanisms could become extremely damaging if not controlled. They are identified in another module, Properties of Metals. High corrosion resistance  is  desirable  in  reactor systems  since  low  corrosion  resistance  leads  to  raise  production of  corrosion products that might be transported by the core.  These products become irradiated and contaminate the whole system. This contamination contributes to high radiation levels after shutdown. For these purpose, corrosion resistant materials are specially selected for use in the primary and secondary coolant systems.