report

Belgian stress tests action plan ‐ 2012‐12‐14No Topic Source Recommendations, Requirements from other national reviews Action : Family ‐ subfamily ‐ sub‐subfamilyActions to beimplementedComment53Emergencypreparedness andresponseNational regulatoryinspectionAs a further diversification of the strategies available to manage a severeaccident, an optimal battery load shedding strategy (in order to extend as longas possible the lifetime of the batteries and thus the period of availability ofvital equipment for the management of the severe accident), should bedeveloped and added to the ERG procedures (severe accident prevention) andto the BK/SAMG procedures (severe accident mitigation).A calculation and decision support tool should be studied in parallel todetermine the loads that can be shed, the extra battery autonomy gained byshedding a specific load, the severe accident management functions that willbe lost by shedding a specific load, and the alternatives that could beconsidered to (partly) compensate for the loss of each particular severeaccident management function.Power supply ‐ Batteries autonomy ‐ Increasingbattery autonomy397, 398, 501, 502, 594,595§ 7.2.5 of national stresstests report54 Design issuesNational regulatoryinspectionThe licensee should review the plants technical specifications in order tofurther improve the availability of the second level emergency equipment. Inparticular, the maximum allowed downtimes and the time limits for return toservice should be re‐evaluated and justified, given the risks involved.Operation management ‐ Varia ‐ Maintaininginstalled but non‐required equipments available asback‐up399, 528, 529§ 7.2.5 of national stresstests report55Design issuesNational regulatoryinspectionThe licensee should regard the additional means (including non conventionalmeans) as safety related equipment as long as they play a key role in theprevention, the detection and/or the mitigation of a severe accident (defencein depth). In this context, the licensee shall determine the specific provisionsapplicable to this equipment where appropriate (introduction in the technicalspecifications, inspections and testing, preventive maintenance…).Emergency management ‐ Requirements ‐Specifications of mobile meansExternal hazards ‐ Flooding ‐ Availability of theadditionnal means against extreme flooding400, 515, 541§ 7.2.5 of national stresstests reportAdditional topics9/9