Assessment of the potential Total Effective Dose (TED) and Ground Deposition (GD) following a hypothetical accident at the proposed Rooppur Nuclear Power Plant

The radiological consequences following a severe hypothetical accident at the proposed Rooppur Nuclear Power Plant in Bangladesh, have been assessed using the health physics code HotSpot 3.1, developed by Lawrence Livermore National Laboratory, USA in this study. The source term for this approach has been calculated analytically. Atmospheric dispersion characteristics have been branded using the site-specific meteorological data of 30 years, obtained from Bangladesh Meteorological Department. The TED and GD values have been calculated in the downwind distance for six individual cases along the plume centerline from the release point up to 200 km. The cases include three seasons namely Summer, Rainy and Winter with three stability classes A, B and F prevailing around the region. The highest value of TED and GD observed is for Rainy season (Stability Class F). The three TED contours have been drawn for 1.00, 0.50 and 0.05 Sv respectively which reflect dose limits for permanent relocation, emergency worker and evacuation, as established by IAEA-TECDOC-953. Demographic analysis reveals that the highest number of affected population corresponds to Rainy season, as it is more spread.