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Belgian stress tests action plan ‐ 2012‐12‐14No Topic Source Recommendations, Requirements from other national reviews Action : Family ‐ subfamily ‐ sub‐subfamilyActions to beimplementedComment1Natural hazards(earthquake)ENSREG country peerreview reportProbabilisitc seismic hazard analysisIt is recommended that the national regulator monitors the completion of theupdated PSHA related to the seismic hazard, the implementation of theconsequential measures and the updated assessment of safety margins. Theseupdates may benefit from a harmonization of the seismic hazard assessmenton an international level. Experience exchange, namely among theneighbouring countries is recommended, in order to avoid discrepancies forsites with comparable seismic activity.External hazards ‐ Earthquake ‐ Reevaluation of theseismic hazard regarding Design Basis Earthquake1, 429§ 2.1.3 of country peerreview report.2Natural hazards(earthquake)ENSREG country peerreview reportSeismic instrumentationThe seismic instrumentation which was observed during the plant visitappeared to offer an opportunity for improvement with respect to the numberof accelerometers and to the evaluation procedure. An immediate evaluationof the recorded signals, allowing the comparison of response spectra with thedesign basis spectra and a direct access to this information is recommended inorder to facilitate and to accelerate the measures to be initiated after a seismicevent.External hazards ‐ Earthquake ‐ Regulatory watch 616§ 2.1.3 of country peerreview report.3Natural hazards(flooding)ENSREG country peerreview reportSafety improvementsRegarding the protection against external flood for the Tihange site, it isrecommended that the national regulator should focus on the implementationof all safety improvements proposed by the licensee, as well as thoseprescribed by the regulator.External hazards ‐ Flooding ‐ Internal emergencyplan proceduresExternal hazards ‐ Flooding ‐ Procedures in case offloodingExternal hazards ‐ Flooding ‐ Protection againstbuildings floodingExternal hazards ‐ Flooding ‐ Protection against siteflooding34, 37, 38, 39, 66, 67,68, 69, 70, 71, 72, 73,74, 75, 76, 77,§ 2.2.3 of country peerreview report.4Natural hazards(flooding)ENSREG country peerreview reportSafety improvementsRegarding the protection against external flood for the Doel site, it isrecommended that the national regulator monitor the implementation of themeasures proposed in the action plan.External hazards ‐ Flooding ‐ Protection againstbuildings floodingExternal hazards ‐ Flooding ‐ Protection against siteflooding430, 431, 432, 433, 434, § 2.2.3 of country peer435, review report.5Natural hazards(weather)ENSREG country peerreview reportExtreme weather conditions,With respect to extreme weather conditions, the derivation of design basisparameters with 10,000 years return periods is recommended to beconsidered.External hazards ‐ Extreme weather conditions ‐Confirmation of resistance to tornadoesExternal hazards ‐ Extreme weather conditions ‐Sewage capacity evaluation441, 443, 546, 547§ 2.3.3 of country peerreview report.7 Design issuesENSREG country peerreview reportAutonomy of safety systemsThe peer review team recommends Belgian regulatory body to take intoconsideration the benefits of the increasing (up to at least 72 hours) of theautonomy of the emergency diesel generators of the 2nd level safety systemsat Tihange 1 for events determined by design basis earthquake, possibly byenhancing the robustness of the CVA B01Hc fuel tank to design basisearthquake.External hazards ‐ Earthquake ‐ Impact earthquakeon a fuel tank of Tihange 1.614§ 4.3 of country peerreview report.Additional topics1/9