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ICRP International

Conference on Recovery After Nuclear Accidents

Radiological Protection Lessons
from Fukushima and Beyond

December 1 - 18, 2020

S. Sil, K. Gaurav, P. Krishna Kumar, Y.K. Pandey, H.P. Rammohan

Updated: Dec 11, 2020

Effect of Meteorological Characteristics on Atmospheric Dispersion and Off-site Radiation Dose Consequences Following a Postulated Severe Accident in VVER-1000 Reactor

S. Sil, K. Gaurav, P. Krishna Kumar, Y.K. Pandey, H.P. Rammohan (Nuclear Power Corporation of India Limited)

Radiological Impact Assessment following a postulated accident is an integral part of safety analysis studies for nuclear reactor and facilities. It is required for quantifying the radiations risk to the public, to the environment and assessment of the effectiveness of suitable protection or mitigation actions for emergency preparedness plan.

This study brings out the effect of Site Meteorological characteristics on the atmospheric dispersion of radionuclides from VVER-1000 reactor following a postulated Design Extension Condition with Core Melt (Severe Accident) and subsequent public dose beyond the Exclusion Zone Boundary. The study has been carried out using an in-house code ‘DARSH’ in accordance with the regulatory guidelines of India.

The timing and effectiveness of different mitigatory measures (Iodine Thyroid blocking, sheltering, evacuation, food ban) have been predicted for different atmospheric conditions. As a result of this parametric study it is concluded that the permanent relocation of the population is not required.



S. Sil, K. Gaurav, P. Krishna Kumar, Y.K. Pandey, H.P. Rammohan (Nuclear Power Corporation of India Limited)


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