Atmospheric dispersion modelling and radiological safety analysis have been performed for a postulated accident scenario of a generic VVER-1000 nuclear power plant using the HotSpot Health Physics code. The total effective dose equivalent (TEDE), the respiratory time-integrated air concentration, and the ground deposition concentration are calculated considering site-specific meteorological conditions. The results show that the maximum TEDE and ground deposition concentration values of 3.69E – 01 Sv and 3.80E + 06 kBq/m² occurred at downwind distance of 0.18 km from the release point. This maximum TEDE value is recorded within a distance where public occupation is restricted. The TEDE values at distances of 5.0 km and beyond where public occupation is likely to be found are far below the annual regulatory limits of 1 mSv from public exposure in a year even in the event of worse accident scenario as set in IAEA Safety Standard No. GSR Part 3; no action related specifically to the public exposure is required. The released radionuclides might be transported to long distances but will not have any harmful effect on the public. The direction of the radionuclide emission from the release point is towards the north east. It is observed that the organ with the highest value of committed effective dose equivalent (CEDE) appears to be the thyroid. It was followed by the bone surface, lung, red marrow, and lower large intestine wall in order of decreasing CEDE value. Radionuclides including I-131, I-133, Sr-89, Cs-134, Ba-140, Xe-133, and Xe-135 were found to be the main contributors to the CEDE.

中文翻译：

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VVER-1000通用核动力厂假想事故的放射安全分析

已使用HotSpot Health Physics代码对通用VVER-1000核电站的假定事故场景进行了大气弥散建模和放射安全分析。考虑到特定地点的气象条件，计算总有效剂量当量（TEDE），呼吸时间积分空气浓度和地面沉积浓度。结果表明，最大TEDE和地面沉积物浓度值为3.69 E  – 01 Sv和3.80 E  + 06 kBq / m ²发生在离释放点0.18 km的顺风距离。在限制公共职业的距离内记录此最大TEDE值。即使在IAEA安全标准No.1中规定的更严重事故情况下，距离5.0 km甚至更远可能会出现公共职业的TEDE值也远远低于一年内每年因公众暴露而产生的1 mSv的年度监管限值。 GSR第3部分；无需采取专门与公众接触有关的行动。释放的放射性核素可能被长距离运输，但不会对公众造成任何有害影响。来自释放点的放射性核素发射方向朝东北。据观察，具有最高有效有效剂量当量（CEDE）值的器官似乎是甲状腺。其次是骨表面，肺，红骨髓和较低的大肠壁，以降低CEDE值的顺序。发现包括I-131，I-133，Sr-89，Cs-134，Ba-140，Xe-133和Xe-135在内的放射性核素是CEDE的主要贡献者。