Individual:
http://rdf.iit.demokritos.gr/2014/iaeaSafetyGlossary/id511
Annotations (2)
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nreo:canonicalLabel "plant states" (en)
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skos:definition "Operational states<br/>
Accident conditions<br/>
Within design basis<br/>
Beyond design basis<br/>
accidents<br/>
accidents<br/>
Anticipated<br/>
Design<br/>
Normal<br/>
operational<br/>
basis<br/>
Severe<br/>
operation<br/>
a<br/>
b<br/>
occurrences<br/>
accidents<br/>
accidents<br/>
Accident management<br/>
a<br/>
'Accident conditions' that are not 'design basis accidents' as explicitly considered but<br/>which are encompassed by them.<br/>
b<br/>
'Beyond design basis accidents' without significant core degradation.<br/>
This figure differs from that in the 1988 versions of the Nuclear Safety <br/>Standards Codes, as follows:<br/>(a) 'Accident conditions' are now taken to include all non-operational states, <br/>
rather than just 'design basis accidents' and those conditions encompassed <br/>by them (marked a);<br/>
(b) The new category, marked b, of 'beyond design basis accidents' that are not <br/>
classified as 'severe accidents' because there is no significant core <br/>degradation;<br/>
(c) The term 'accident management' is applied only to 'beyond design basis '<br/>
'accidents', rather than to all non-operational states.<br/>
<i><b>accident conditions.</b></i> 'Deviations' from 'normal operation' more severe than <br/>'anticipated operational occurrences', including 'design basis accidents' and <br/>'severe accidents'.<br/>
Examples of such 'deviations' include a major 'fuel failure' or a loss of coolant <br/>accident (LOCA).<br/>See 'accident'.<br/>
<i><b>accident management.</b></i> The taking of a set of actions during the evolution <br/>of a 'beyond design basis accident':<br/>
(a) To prevent the escalation of the 'event' into a 'severe accident';<br/>(b) To mitigate the consequences of a 'severe accident';<br/>(c) To achieve a long term safe stable state.<br/>
The second aspect of 'accident management' (to mitigate the consequences of a <br/>'severe accident') is also termed 'severe accident management'.<br/>
<i><b>anticipated operational occurrence.</b></i> An operational 'process' deviating <br/>from 'normal operation' which is expected to occur at least once during the <br/>'operating lifetime' of a 'facility' but which, in view of appropriate <i>design<br/></i>provisions, does not cause any significant damage to <i>items important to <br/>safety</i> or lead to 'accident conditions'.<br/>
Examples of 'anticipated operational occurrences' are loss of normal electrical <br/>power and faults such as a turbine trip, malfunction of individual items of a <br/>normally running plant, 'failure' to function of individual items of <i>control<br/></i>equipment, and loss of power to the main coolant pump.<br/>Some States and organizations use the term <i><b>abnormal operation</b></i> (for contrast <br/>with 'normal operation') for this concept.<br/>
<i><b>beyond design basis accident.</b></i> 'Accident conditions' more severe than a <br/>'design basis accident'.<br/>
<i><b>design basis accident.</b></i> 'Accident conditions' against which a 'facility' is <br/>designed according to established 'design' criteria, and for which the <br/>damage to the 'fuel' and the release of 'radioactive material' are kept within <br/>'authorized limits'.<br/>
<i><b>normal operation.</b></i> 'Operation' within specified <i>operational limits and <br/>conditions</i>.<br/>
For a nuclear power plant, this includes startup, power 'operation', shutting <br/>down, shutdown, 'maintenance', testing and refuelling.<br/>
<i><b>operational states.</b></i> States defined under 'normal operation' and <i>anticipated <br/>operational occurrences</i>.<br/>
Some States and organizations use the term <i><b>operating conditions</b></i> (in contrast <br/>to 'accident conditions') for this concept.<br/>
<i><b>severe accident.</b></i> 'Accident conditions' more severe than a <i>design basis <br/>accident</i> and involving significant core degradation.<br/>
<i><b>severe accident management.</b></i> See 'severe accident' and <i>accident <br/>management</i>.<br/>
By extension, 'accident management' for a 'severe accident' includes the taking of <br/>a set of actions during the evolution of the 'accident' to mitigate degradation of <br/>the core.<br/>
<i><b>within design basis accident.</b></i> 'Accident conditions' not more severe than a <br/>'design basis accident'.<br/>" (en)
Types (1)
Usage (32)