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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.

VVER-1000炉の想定シビアアクシデント後に気象特性が大気拡散やサイト外放射線量影響に及ぼす効果

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


想定事故後の放射線影響評価は、原子炉及び原子力施設の安全解析調査に不可欠な部分である。これは一般市民や環境への放射線リスクを定量化し、緊急時準備計画に適した防護措置や緩和措置の実効性を評価するのに必要とされる。本調査では、炉心溶融を伴う想定設計外状態(シビアアクシデント)後のVVER-1000炉による放射性核種の大気拡散とその後の立入禁止区域境界を越える公衆被ばく線量にサイトの気象特性が及ぼす効果を明らかにする。本調査はインドの規制ガイドラインに従い内部コード「DARSH」を用いて行われた。さまざまな緩和対策(ヨウ素甲状腺遮断、屋内退避、避難、食料禁止)の時期と実効性をさまざまな大気条件で予測している。本パラメーター調査の結果、住民の恒久的な移住は必要ないと結論付けられている。

Paper-C32_SSil-etal
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