Radiological Safety Analysis for a Hypothetical Accident of a Generic VVER-1000 Nuclear Power Plant
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Date
2020-01-21
Journal Title
Journal ISSN
Volume Title
Publisher
Hindawi Science and Technology of Nuclear Installations
Abstract
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. ,e total effective dose equivalent (TEDE), the
respiratory time-integrated air concentration, and the ground deposition concentration are calculated considering site-specific
meteorological conditions. ,e 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. ,is maximum TEDE
value is recorded within a distance where public occupation is restricted. ,e 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. ,e released radionuclides might be transported to long distances but will not have any harmful effect
on the public. ,e 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.
Description
Research Article
Keywords
radiological safety, total effective dose equivalent (TEDE), public occupation, IAEA