report

Belgian stress tests action plan ‐ 2012‐12‐14No Topic Source Recommendations, Requirements from other national reviews Action : Family ‐ subfamily ‐ sub‐subfamily24Emergencypreparedness andresponseNational regulatoryinspectionOn‐site transportMeans for on‐site transport of personnel and equipment towards the units,inside the units, or from one unit to another, while the site is flooded, shouldbe further implemented and considered in the emergency preparednessstrategy.External hazards ‐ Flooding ‐ Procedures in case offloodingActions to beimplemented544CommentTihange NPP only§ 7.2.2 of national stresstests report25 Design issuesNational regulatoryinspectionInduced internal hazardsInternal hazards potentially induced by the flooding (fire, explosion) should beexamined and additional measures should be taken where needed (e.g.,because the automatic fire extinction system is lost during a flood exceedingthe “reference flood”). The potential deficiency of the Ultimate Means Circuit(CMU) in case of induced fire, in particular because of dependencies when theCMU is connected to the fire extinction system (CEI), should be examined andpotential weaknesses should be resolved.External hazards ‐ Flooding ‐ Procedures in case offlooding545Tihange NPP only§ 7.2.2 of national stresstests report26Design issuesNational regulatoryinspectionNon conventional meansThe technical characteristics of the non‐conventional means (NCM) that can beused in case of flooding of safety‐related buildings (for all potential causes)should account for the adverse (weather) conditions they may be subject toduring the whole period of operation. If this is not covered by design, anappropriate protection or compensatory strategy should be developed.Emergency management ‐ Infrastructure ‐ On‐siteresistant storage for mobile meansEmergency management ‐ Requirements ‐Specifications of mobile means400, 509, 515, 572, 573Doel NPP only§ 7.2.2 of national stresstests report27Emergencypreparedness andresponseNational regulatoryinspectionEmergency proceduresImprovement of the procedures after earthquake (I‐QM‐01): after anearthquake, it shall be rapidly and visually verified if flooding due to coolingtower basin overflow (e.g. due to obstruction of its outlet channel) is ongoingor imminent. In that case, the CW pumps must be rapidly stopped.External hazards ‐ Earthquake ‐ Risk mitigation ofinternal flooding from circulation water circuit2, 3, 4, 5, 442Doel NPP only§ 7.2.2 of national stresstests report28Natural hazards(flooding)National regulatoryinspectionPeriodic inspectionsAs recent inspections evidenced locations with embankment heightsapproaching the minimal required height (Technical Specifications criterion),embankment height inspections should be done more regularly (e.g., twoyearly,and at least 5‐yearly, instead of ten‐yearly) in order to avoid a risk of floodingExternal hazards ‐ Flooding ‐ Protection against siteexcessive embankment overtopping by wind waves for floods within the designbasis (embankment overtopping may occur for return periods larger than 300years).434, 435Doel NPP only§ 7.2.2 of national stresstests reportAdditional topics4/9