Dresden 2013 – scientific programme

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AGA: Arbeitsgruppe Physik und Abrüstung

AGA 2: Monitoring und Überwachung von Kernmaterialien

AGA 2.4: Talk

Wednesday, March 6, 2013, 16:00–16:30, HSZ-04

Nuclear Safeguards for an Underground Final Repository - Research for Acoustic-Seismic Monitoring — •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 potential access, during and after the emplacement phase. Tasked by the German Support Programme for the IAEA we have measured acoustic and seismic signals from various mining activities in the Gorleben exploratory mine. Geophone spectra show excitation up to several kHz, often with considerable broad-band content. With periodic machinery harmonic series appear. Seismic signal strengths from different sources vary by three (including blast shots by six) orders of magnitude, in power-law fits the decrease with distance is with exponents -2 to -0.8. Many sources could be detected by amplitude at several 100 m distance, blasts at several km. By a ring of underground geophones around a repository in salt monitoring for undeclared activities seems principally possible.