Risk Impact of Maintenance and Other Activities with Regard to Plant Areas

In all operating modes of a nuclear power plant lot activities take place, including maintenance, surveillance testing and modifications. Some these can impose temporary increase in risk level, as they may change the status equipment important to safety. Such increases are usually controlled by monitoring, which considers changes due (e.g. availability) systems functions. Risk monitors are, many cases, designed operated be system-oriented (or function-oriented), focus on “measuring” associated with different system configurations (from where comes often used term “configuration management”). On other hand, components placed various locations at floors (elevations) buildings. Piping, well cabling, is routed through one or more Equipment performing functions is, sometimes, located near each architectural limitations. Where required, barriers applied order ensure physical separation independency. Due reasons, particular area (compartment, room, part large room,…) contain variety mechanical, electrical / safety implications. As components, areas also related other, degrees relative importance. Since performed imply changes, actual potential, equipment, structures barriers, there need that monitoring area-oriented aspects, beside considering those function-oriented. impact an activity taking place considered terms (potential actual) its three components: 1) likelihood initiators triggered (but not mitigated any same area); 2) mitigating capability regarding this area; 3) initiators. Activity none combination components. Normally, under limited engineering principles (because it become very contributor). However, present some residual form cannot excluded (as demonstrated area-related studies past, such internal fire flooding analyses). With area, relevant importance (and, hence, potential planned go time) then of, respectively: whether contains for mitigation includes triggering initiator include The paper discusses issues describes basic concepts management.