Analysis of Radionuclide Releases from the Fukushima Dai-ichi Nuclear Power Plant Accident Part II
The present part of the publication (Part II) deals with long range dispersion of radionuclides emitted into the atmosphere during the Fukushima Dai-ichi accident that occurred after the March 11, 2011 tsunami. The first part (Part I) is dedicated to the accident features relying on radionuclide detections performed by monitoring stations of the Comprehensive Nuclear Test Ban Treaty Organization network. In this study, the emissions of the three fission products Cs-137, I-131 and Xe-133 are investigated. Regarding Xe-133, the total release is estimated to be of the order of 6 × 1018 Bq emitted during the explosions of units 1, 2 and 3. The total source term estimated gives a fraction of core inventory of about 8 × 1018 Bq at the time of reactors shutdown. This result suggests that at least 80 % of the core inventory has been released into the atmosphere and indicates a broad meltdown of reactor cores. Total atmospheric releases of Cs-137 and I-131 aerosols are estimated to be 1016 and 1017 Bq, respectively. By neglecting gas/particulate conversion phenomena, the total release of I-131 (gas + aerosol) could be estimated to be 4 × 1017 Bq. Atmospheric transport simulations suggest that the main air emissions have occurred during the events of March 14, 2011 (UTC) and that no major release occurred after March 23. The radioactivity emitted into the atmosphere could represent 10 % of the Chernobyl accident releases for I-131 and Cs-137.
KeywordsFukushima Dai-ichi accident atmospheric transport modeling source terms evaluation Cs-137 I-131 Xe-133 CTBTO
- Achim, P., Gross, P., Le Petit, G., Taffary, T. and Armand, P. (2011), Contribution of Isotopes Production Facilities and Nuclear Power Plants to the Xe-133 Worldwide Atmospheric Background. CTBT Science and Technology, June 8 to 10, Vienna, Austria.Google Scholar
- BIOsphere Modelling and ASSessment (BIOMASS) programme: Testing of environmental transfer models using data from the atmospheric release of Iodine-131 from the Hanford site, USA, in 1963. Report of the Dose Reconstruction Working Group of the Biomass Programme, Theme 2. International Atomic Energy Agency, Vienna, March 2003.Google Scholar
- Caput, C., Camus, H., Gauthier, D., and Belot, Y. (1993), Experimental study of washout of iodine vapour scavenged by rain (in French). Radioprotection Volume 28, Number 1, January–March.Google Scholar
- Chino, M., Nakayama, H., Nagai, H., Terada, H., Katata, G., and Yamazawa, H. (2011), Preliminary estimation of release amounts of 131 I and 137 Cs accidentally discharged from the Fukushima Daiichi nuclear power plant into the atmosphere. Journal of Nuclear Science and Technology, Vol. 48, No. 7, 1129–1134.Google Scholar
- DOE, US Department of Energy and National Nuclear Security Administration (NNSA), (2011) Radiological assessment of effects from Fukushima Daiichi power plant. Radiation monitoring data updated from March 22 to May 13.Google Scholar
- Fast, J. D., and Easter, R. C. A. (2006), Lagrangian particle dispersion model compatible with WRF. 7th Annual WRF User’s Workshop, 19–22 June, Boulder, CO.Google Scholar
- FLEXPART and FLEXTRA homepage at the Norvegian Institute for Air Research (NILU). http://transport.nilu.no/flexpart.
- Kalinowski, M.B., and Tuma, M.P. (2009), Global radioxenon emission inventory based on nuclear power reactor reports. Journal of Environmental Radioactivity 100, 58–70.Google Scholar
- Kaneyasu, N., Ohashi, H., Suzuki, F., Okuda, T., and Ikemori, F. (2012), Sulfate Aerosol as a Potential Transport Medium of Radiocesium from the Fukushima Nuclear Accident. Environmental Science & Technology, 46, 5720–5726.Google Scholar
- Katata, G., Ota, M., Terada, H., Chino, M., and Nagai, H. (2012), Atmospheric discharge and dispersion of radionuclides during the Fukushima Dai-ichi Nuclear Power Plant accident. Part I: Source term estimation and local-scale atmospheric dispersion in early phase of the accident. Journal of Environmental Radioactivity 109, 103–113.Google Scholar
- Katata, G., Terada, H., Nagai, H., and Chino, M. (2012), Numerical reconstruction of high dose rate zones due to the Fukushima Dai-ichi Nuclear Power Plant. Journal of Environmental Radioactivity 111, 2–12.Google Scholar
- Le Petit, G., Douysset, G., Ducros, G., Gross, P., Achim, P., Monfort, M., Raymond, P., Pontillon, Y., Jutier, C., Blanchard, X., Taffary, T., and Moulin, C. (2012), Analysis of radionuclide releases from the Fukushima Dai-ichi Nuclear Power Plant accident, Part I, Pure Appl. Geophys. doi:10.1007/s00024-012-0581-6
- MEXT, Ministry of Education, Culture, Sports, Science and Technology—Japan: Reading of environmental radioactivity level by prefecture, Time series data.Google Scholar
- MM5, Modeling System Version 3. PSU/NCAR mesoscale modeling system. Tutorial Class Notes and User’s Guide, January 2005.Google Scholar
- Masson, O., et al. (2011), Tracking of Airborne Radionuclides from the Damaged Fukushima Dai-ichi Nuclear Reactors by European Networks. Environmental Science & Technology, Vol 45, 7670–7677.Google Scholar
- Mathieu, A., Korsakissok, I., Quélo, D., Groëll, J., Tombette, M., Didier, D., Quentric, E., Saunier, O., Benoit, J.P., and Isnard, O. (2012), Atmospheric Dispersion and Deposition of Radionuclides from the Fukushima Daiichi Nuclear Power Plant Accident. Elements, Vol. 8, 195-200.Google Scholar
- Matthews, M. (2010), Workshop on Signatures of Medical and Industrial Isotopes Production (WOSMIP)—A Review. US DOE Report PNNL-19294, February 2010.Google Scholar
- NCEP/GFS meteorological data at global scale. http://weather.noaa.gov/pub/SL.us008001/ST.opnl.
- NISA, Japanese Nuclear and Industrial Safety Agency: Bulletins on conditions of Fukushima Daiichi Nuclear Power Station. http://www.nisa.meti.go.jp/english/press/index.html.
- Okada, S. (2011), Off-Site Activities regarding the Accident at the Fukushima Daiichi Nuclear Power Station and Lesson from Them. World Engineers’ Convention, Geneva, 4–9 September.Google Scholar
- Pittauerová, D., Hettwig, B., and Fischer, W. (2011), Fukushima fallout in Northwest German environmental media. Journal of Environmental Radioactivity, 102, 877–880.Google Scholar
- Qiao, F.L., Wang, G.S., Zhao, W., Zhao, J.C., Dai, D.J., Song, Y.J., and Song, Z.Y. (2011), Predicting the spread of nuclear radiation from the damaged Fukushima Nuclear Power Plant. Chinese Science Bulletin Vol. 56, No. 18, 1890–1896.Google Scholar
- Quélo, D., Groëll, J., Didier, D., Mathieu, A., Korsakissok, I., Tombette, M., Quentric, E., Benoit, J.P., and Isnard, O. (2011), Atmospheric transport modeling and situation assessment of the Fukushima accident. 15th annual GMU conference on atmospheric transport & dispersion modeling, July 12–14, Fairfax, Virginia, U.S.A.Google Scholar
- Sehmel, G.A. (1980), Particle and gas dry deposition: a review. Atmospheric Environment Vol. 14, pp. 983–1011.Google Scholar
- Slinn, W.G.N. (1982), Predictions for particle deposition to vegetative canopies. Atmos. Environ., 16, 1785–1794.Google Scholar
- Stohl, A., Hittenberger, M., and Wotawa, G. (1998), Validation of the Lagrangian particle dispersion model FLEXPART against large-scale tracer experiment data. Atmos. Environ. 32, 4245–4264.Google Scholar
- Stohl, A., Seibert, P., Wotawa, G., Arnold, D., Burkhart, J.F., Eckhardt, S., Tapia, C., Vargas, A., and Yasunari, T.J. (2012), Xenon-133 and caesium-137 releases into the atmosphere from the Fukushima Dai-ichi nuclear power plant: determination of the source term, atmospheric dispersion, and deposition. Atmospheric Chemistry and Physics, 12, 2313–2343.Google Scholar
- Takemura, T., Nakamura, H., Takigawa, M., Kondo, H., Satomura, T., Miyasaka, T., and Nakajima, T. (2011), A Numerical Simulation of Global Transport of Atmospheric Particles Emitted from the Fukushima Daiichi Nuclear Power Plant. SOLA, Vol. 7, 101–104.Google Scholar
- TEPCO Press releases. http://www.tepco.co.jp/en/nu/press/f1-np/index-e.html.
- Terada, H., Katata, G., Chino, M., and Nagai, H. (2012), Atmospheric discharge and dispersion of radionuclides during the Fukushima Dai-ichi Nuclear Power Plant accident. Part II: verification of the source term and analysis of regional-scale atmospheric dispersion. Journal of Environmental Radioactivity 112, 141–154.Google Scholar
- UNSCEAR: Exposures and effects of the Chernobyl accident. Annex J. Report Vol 2, 456–457, (2000).Google Scholar
- Uematsu, M., Merril J.T., Patterson T.L., Duce, R.A., and Prospero J.M. (1988), Aerosol residence time and iodine gas/particle conversion over the North Pacific as determined from Chernobyl radioactivity. Geochemical Journal, Vol. 22, 157–163.Google Scholar
- Wesely, M.L. and Hicks, B.B. (1977), Some factors that affect the deposition rates of sulfur dioxide and similar gases on vegetation. J. Air Poll. Contr. Assoc., 27, 1110–1116.Google Scholar
- Winiarek, V., Bocquet, M., Saunier, O., and Mathieu A. (2012), Estimation of Errors in the Inverse Modeling of Accidental Release of Atmospheric Pollutant: Application to the Reconstruction of the Cesium-137 and Iodine-131 Source Terms from the Fukushima Daiichi Power Plant. Journal of Geophysical Research, doi:10.1029/2011JD016932.