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AGA: Arbeitsgruppe Physik und Abrüstung

AGA 8: Acoustic and Seismic Signals for Safeguards and Verification

AGA 8.1: Vortrag

Mittwoch, 18. März 2015, 17:00–17:30, EMH 225

Nuclear Safeguards at an Underground Final Repository in Salt - Seismic-Signal Modelling for Detectability — •Jürgen Altmann — Experimentelle Physik III, TU Dortmund, 44221 Dortmund

Final repositories for spent nuclear fuel need to be put under safeguards of the International Atomic Energy Agency (IAEA) to detect undeclared access, during and after the emplacement phase. Following a measurement project at the Gorleben exploratory mine, the next task done for the German Support Programme to the IAEA was to model the propagation of seismic signals caused by mining activities to potential monitoring sites around and within the salt dome. For impulsive and periodic sources the seismic propagation is computed in three dimensions on the LiDO cluster of TU Dortmund using the open program SpecFEM3D. Signal forms and spectra reflect the boundaries of the various layers and their attenuation, modelled by constant quality factors. From the amplitude decrease with distance detection ranges for relevant mining activities are estimated by comparison with typical background noise. This allows conclusions on the required density and number of sensors for a seismic monitoring system.