Pure and Applied Geophysics

, Volume 171, Issue 3, pp 629-644

First online:

Analysis of Radionuclide Releases from the Fukushima Dai-Ichi Nuclear Power Plant Accident Part I

  • G. Le PetitAffiliated withCEA, DAM, DIF Email author 
  • , G. DouyssetAffiliated withCEA, DAM, DIF
  • , G. DucrosAffiliated withCEA, DEN
  • , P. GrossAffiliated withCEA, DAM, DIF
  • , P. AchimAffiliated withCEA, DAM, DIF
  • , M. MonfortAffiliated withCEA, DAM, DIF
  • , P. RaymondAffiliated withCEA, DEN
  • , Y. PontillonAffiliated withCEA, DEN
  • , C. JutierAffiliated withCEA, DAM, DIF
    • , X. BlanchardAffiliated withCEA, DAM, DIF
    • , T. TaffaryAffiliated withCEA, DAM, DIF
    • , C. MoulinAffiliated withCEA, DAM, DIF

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Part I of this publication deals with the analysis of fission product releases consecutive to the Fukushima Dai-ichi accident. Reactor core damages are assessed relying on radionuclide detections performed by the CTBTO radionuclide network, especially at the particulate station located at Takasaki, 210 km away from the nuclear power plant. On the basis of a comparison between the reactor core inventory at the time of reactor shutdowns and the fission product activities measured in air at Takasaki, especially 95Nb and 103Ru, it was possible to show that the reactor cores were exposed to high temperature for a prolonged time. This diagnosis was confirmed by the presence of 113Sn in air at Takasaki. The 133Xe assessed release at the time of reactor shutdown (8 × 1018 Bq) turned out to be in the order of 80 % of the amount deduced from the reactor core inventories. This strongly suggests a broad meltdown of reactor cores.


Fukushima Dai-ichi accident Takasaki fission products reactor damages isotopic ratios CTBTO