SOME RESULTS OF MODELING THE RADIATION CONDITIONS AND ASSESSING THE SOURCE TERM AT FUKUSHIMA-1 NPP WITH THREE-DIMENSIONAL FIELDS OF METEOROLOGICAL DATA (PREPRINT IBRAE-2011-07)

Preprint IBRAE-2011-07

The results of assessment of source term in the accident at Fukushima-1 NPP and modeling of the radiation situation in Japan territory using detailed three-dimensional fields of meteorological data are presented. It is shown that the wind, temperature and precipitation fields found from the WRF-ARW model with resolution of 10 km are in good agreement with the results of NCEP (National Centers for Environmental Prediction, USA). The dose rates assessed on the basis of modeling at the points of radiation monitoring in Japan differ from results of airborne gamma survey no more than 2 times. Proposed assessments of the sources of accidental releases into the atmosphere during March 15, 2011 due to a series of accidents at the units of Fukushima-1 NPP, on the whole, correspond to the real radiation conditions. This is confirmed by the simulation results, data of dose rate measurements, results of airborne gamma survey and estimates of Cs-137 fallout based on the data of monitoring services.

Bibliographical reference 

Arutyunyan R.V., Bakin R.I., Bolshov L.A., Dzama D.V., Pripachkin D.A., Semyonov V.N., Sorokovikova O.S, Fokin A.V., Tsaun S.N., Shikin A.V. (IBRAE RAN), Ignatov R.Y., Rubinstein K.G., Smirrnova M.M. (State Institution “Hydrometeorological Centre of Russia”). Some results of modeling the radiation conditions and assessing the source term at Fukushima-1 NPP with three-dimensional fields of meteorological data. Preprint No. IBRAE-2011-07. Moscow, Nuclear Safety Institute of the Russian Academy of Sciences (IBRAE RAN), 2011, 20 p.