Non-Physical Ageing 1
Non-Physical Ageing 1 : The process of becoming out-of-date (i.e. obsolete) owing to the evolution of knowledge and technology and associated changes in codes and standards. Examples of non-physical ageing effects include the lack of an effective containment or emergency core cooling system, the lack of safety design features (such as diversity, separation or redundancy), the unavailability of qualified spare parts for old equipment, incompatibility between old and new equipment, and outdated procedures or documentation (e.g. which thus do not comply with current regulations). Strictly, this is not always ageing as defined above, because it is sometimes not due to changes in the structure, system or component itself. Nevertheless, the effects on protection and safety, and the solutions that need to be adopted, are often very similar to those for physical ageing. The term technological obsolescence is also used. Physical Ageing. Ageing of structures, systems and components due to physical, chemical and/or biological processes (ageing mechanisms). Examples of ageing mechanisms include wear, thermal or radiation embrittlement, corrosion and microbiological fouling. The term material ageing is also used
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