JOPSS - Search Results

JAEA has been developing simulation system to predict the environmental transport of radionuclide. SPEEDI was developed and it is currently operational as a emergency response system of Japan. By expanding SPEEDI, WSPEEDI was constructed with a combination of atmospheric model MM5 and particle dispersion model GEARN. WSPEEDI has been applied for analysis on the environmental impact by the Fukushima Daiichi NPP accident. At first, the source term of radionuclide discharged into the atmosphere was estimated by coupling monitoring data with atmospheric dispersion simulations. By using this source term, detailed analysis on the local and regional atmospheric dispersion has been carried out. The source term was also used by the UNSCEAR for the atmospheric dispersion analysis and dose estimation. Recently, we re-estimated source term by using newly released data and modified WSPEEDI. The simulation well reproduced the local and regional deposition pattern of $^{131}$ I and $^{137}$ Cs.

Oral presentation

Source term estimation based on environmental monitoring data

Nagai, Haruyasu

no journal, ,

no abstracts in English

Oral presentation

Utilization of atmospheric dispersion simulation for the source term estimation and radiation dose assessment of the Fukushima Daiichi Nuclear Power Station accident

Terada, Hiroaki; Nagai, Haruyasu

no journal, ,

no abstracts in English

Oral presentation

Source term estimation of radioactive materials released to the atmosphere due to the Fukushima Daiichi Nuclear Power Station accident

Nagai, Haruyasu; Terada, Hiroaki

no journal, ,

no abstracts in English

Oral presentation

Developments and applications of atmospheric dispersion prediction model; Source term estimation of the Fukushima Daiichi Nuclear Power Station Accident and dispersion analysis of radioactive nuclides released from nuclear fuel reprocessing plants

Terada, Hiroaki

no journal, ,

no abstracts in English

Oral presentation

Development of an estimation method of concentration distribution and release amount of radionuclide discharged to the atmosphere using gamma-ray imaging, 1; Outline of study

Nagai, Haruyasu; Tanimori, Toru*; Nakayama, Hiromasa; Satoh, Daiki; Furuta, Yoshihiro

no journal, ,

no abstracts in English

Oral presentation

Development and application of atmospheric dispersion prediction models for radioactive material

Terada, Hiroaki

no journal, ,

no abstracts in English

Oral presentation

Development of an estimation method of concentration distribution and release amount of radionuclide discharged to the atmosphere using gamma-ray imaging, 4; A Prototype of estimation method

Nagai, Haruyasu; Furuta, Yoshihiro*; Satoh, Daiki; Nakayama, Hiromasa

no journal, ,

no abstracts in English

Oral presentation

Nuclear safety and recent trends in health physics; Progress and challenges in atmospheric dispersion modeling

Nagai, Haruyasu

no journal, ,

no abstracts in English

Oral presentation

Nuclear safety and recent trends in health physics; Progress and challenges in atmospheric dispersion modeling

Nagai, Haruyasu

no journal, ,

no abstracts in English

Presentation/Publication Type

Journal/Book Title

Meeting title

First Author

Keyword

Language

Publication Year

Held year of conference

Relation between nasty smell at Kanto area on 28 August 2000 and eruption at Miyake Island; Examination by numerical simulation

Present status of the radioactive contamination around the Chernobyl nuclear power plant

Analyses of accident events on thermal-hydraulics in fusion reactor design

Development of the emergency system for radioactive source term estimation

Real-time high-sensitivity fuel failure detection for HTGR

None

Reduction of erosion by blistering in molybdenum surface with a multi-groove microstructure

A Study of the Fast Reactor Core Meltdown and Collapsing Accident

Investigation on the release amount of $^{133}$ Xe from the Fukushima Dai-ichi Nuclear Power Plant

Application of atmospheric dispersion simulation system WSPEEDI for analysis on the environmental impact due to the Fukushima Daiichi Nuclear Power Station accident

Source term estimation based on environmental monitoring data

Utilization of atmospheric dispersion simulation for the source term estimation and radiation dose assessment of the Fukushima Daiichi Nuclear Power Station accident

Source term estimation of radioactive materials released to the atmosphere due to the Fukushima Daiichi Nuclear Power Station accident

Developments and applications of atmospheric dispersion prediction model; Source term estimation of the Fukushima Daiichi Nuclear Power Station Accident and dispersion analysis of radioactive nuclides released from nuclear fuel reprocessing plants

Development of an estimation method of concentration distribution and release amount of radionuclide discharged to the atmosphere using gamma-ray imaging, 1; Outline of study

Development and application of atmospheric dispersion prediction models for radioactive material

Development of an estimation method of concentration distribution and release amount of radionuclide discharged to the atmosphere using gamma-ray imaging, 4; A Prototype of estimation method

Nuclear safety and recent trends in health physics; Progress and challenges in atmospheric dispersion modeling

Nuclear safety and recent trends in health physics; Progress and challenges in atmospheric dispersion modeling