| Title | Atmospheric discharge and dispersion of radionuclides during the Fukushima Dai-ichi Nuclear Power Plant accident, 1; Source term estimation and local-scale atmospheric dispersion in early phase of the accident |
| Alternative title | 福島第一原子力発電所事故における放射性物質の大気放出及び拡散過程,1; 事故初期の放出量推定とプラント周辺地域の大気拡散 |
| Publisher | Elsevier |
| Author | Katata, Genki |
| Author | Ota, Masakazu |
| Author | Terada, Hiroaki |
| Author | Chino, Masamichi |
| Author | Nagai, Haruyasu |
| Issued date | 2012-07 |
| Language | eng |
| Page | 103p.-113p. |
| Type | report |
| Description | The source term of 131I and 137Cs discharged in early phase of the Fukushima Dai-ichi Nuclear Power Plant (FNPP1) accident was estimated by combining environmental data with atmospheric dispersion simulations of a computer-based nuclear emergency response system, WSPEEDI-II. Major releases were estimated when air dose rates increased after the hydrogen explosion at Unit 1 during the afternoon on 12 March and during the midnight on 14 March. The high-concentration plumes discharged during these periods caused large deposition to the northwest and south-southwest directions of FNPP1, respectively. The increases of air dose rates observed at the monitoring posts were overall reproduced by WSPEEDI-II using estimated release rates. The simulation indicated that air dose rates significantly increased in the south-southwest region of FNPP1 by dry deposition of the high-concentration plume discharged from the midnight on 14 March to the morning on 15 March. |
| Information source |  JOPSS Relation URLRelation URL |
| Related sites |
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| URI | https://f-archive.jaea.go.jp/dspace/handle/faa/211522 |
