Radiological dose in Muria peninsula from SB-LOCA event

International Conference on Advances in Nuclear Science and Engineering 2015

Sunarko^1 ; Suud, Zaki^2

BATAN, Jl. Kuningan Barat, Jakarta

10270, Indonesia^1

ITB, Jl. Ganesha 10, Bandung

50254, Indonesia^2

关键词: Accident conditions;    Dose assessments;    Lagrangian particle dispersions;    Meteorological data;    Periodic surfaces;    Radiological dose;    Regulatory limit;    Three-mile island unit 2;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/799/1/012015/pdf
DOI  :  10.1088/1742-6596/799/1/012015

来源: IOP

【 摘 要 】

Dose assessment for accident condition is performed for Muria Peninsula region using source-term from Three-Mile Island unit 2 SB-LOCA accident. Xe-133, Kr-88, I-131 and Cs-137 isotopes are considered in the calculation. The effluent is assumed to be released from a 50 m stack. Lagrangian particle dispersion method (LPDM) employing non-Gaussian dispersion coefficient in 3-dimensional mass-consistent wind-field is employed to obtain periodic surface-level concentration which is then time-integrated to obtain spatial distribution of ground-level dose. In 1-hour simulation, segmented plumes with 60 seconds duration with a total of 18.000 particles involved. Simulations using 6-hour worst-case meteorological data from Muria peninsula results in a peak external dose of around 1.668 mSv for low scenario and 6.892 mSv for high scenario in dry condition. In wet condition with 5 mm/hour and 10 mm/hour rain for the whole duration of the simulation provides only minor effect to dose. The peak external dose is below the regulatory limit of 50 mSv for effective skin dose from external gamma exposure.