Individual:
http://rdf.iit.demokritos.gr/2014/iaeaSafetyGlossary/id32
Annotations (2)
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nreo:canonicalLabel "ageing" (en)
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skos:definition "General 'process' in which characteristics of a 'structure, system or '<br/>
'component' gradually change with time or use.<br/>
Although the term 'ageing' is defined in a neutral sense — the changes <br/>involved in 'ageing' may have no effect on 'protection' or 'safety', or could even <br/>have a beneficial effect — it is most commonly used with a connotation of <br/>changes that are (or could be) detrimental to 'protection and safety' (i.e. as a <br/>synonym of 'ageing degradation').<br/>
<i><b>non-physical ageing.</b></i> The 'process' of becoming out of date (i.e. obsolete) <br/>owing to the evolution of knowledge and technology and associated <br/>changes in codes and standards.<br/>
Examples of 'non-physical ageing' effects include the lack of an effective <br/>'containment' or 'emergency' core cooling 'system', the lack of 'safety' 'design'<br/>
features (such as 'diversity', separation or 'redundancy'), the unavailability of <br/>qualified spare parts for old equipment, incompatibility between old and new <br/>equipment, and outdated 'procedures' or documentation (e.g. which thus do <br/>not comply with current regulations).<br/>Strictly, this is not always 'ageing' as defined above, because it is sometimes not <br/>due to changes in the 'structure, system or component' itself. Nevertheless, the <br/>effects on 'protection and safety', and the solutions that need to be adopted, are <br/>often very similar to those for 'physical ageing'.<br/>The term <i><b>technological obsolescence</b></i> is also used.<br/>
<i><b>physical ageing.</b></i><b> </b>'Ageing' of 'structures, systems and components' due to <br/>physical, chemical and/or biological 'processes' ('ageing' mechanisms).<br/>
Examples of 'ageing' mechanisms include wear, thermal or <i>radiation<br/></i>embrittlement, corrosion and microbiological fouling.<br/>The term <i><b>material ageing</b></i> is also used.<br/>" (en)
Types (1)
Usage (22)