Session: 08-01: New Facility Planning/ Environmental Management (EM)/ Health & Safety

Paper Number: 110324

110324 - Environmental Radiological Risk Assessment From the Loca-Type Accident With the Release of Iodine-131 From Two Nuclear Facilities Simultaneously 

The aim of this article is to estimate the dose of gamma-emitting radionuclides associated with the atmospheric release of radioactive material Iodine-131 from an accident with two release sources using the HotSpot Health Physics software. Monitoring the dispersion of Iodine-131 in the atmosphere after an accident in nuclear facilities is important for safety analysis, not only monitoring the amount of material that will be released, but also how it will be dispersed in the atmosphere, that is, which areas will be affected (outside or within the installation's area of responsibility). The information collected by this monitoring is extremely relevant to assess accumulation, exposure and consequences of exposure to radiation, in addition to assisting in decision-making about remediation requirements in contaminated sites, through the assessment of future impacts . In this article, data from a Loss of coolant (LOCA) type accident of two Pressurized Water Reactor (PWR) type plants were used in order to study the behavior of radioactive plumes in the event of release of the two plants simultaneously. Plume modeling using the Gaussian model in most of the tests carried out assumed different values and fluctuations and directly related to the atmospheric stability class, directly influencing the estimation of the final dose. In the tests carried out, the Atmospheric Stability class F (moderately stable) stood out, as it influences the formation of narrower plumes, and as a consequence, resulting in higher dose concentrations, and a greater risk of manifestation of the symptoms of the Acute Irradiation Syndrome depending on the absorbed dose.

Presenting Author: Juliana Sanchez Federal University of Rio de Janeiro

Presenting Author Biography: - PhD student in Nuclear Engineering at Nuclear Engineering Program on Federal University of Rio de Janeiro;
- Master Degree of Nuclear Engineering at Nuclear Engineering Institute on Federal University of Rio de Janeiro;
- Academic Exchange in Radiation Safety at the Nuclear Facilities on Moscow Engineering Physics Institute;
- MBA in Complex System Modeling on Southern Federal University (former Rostov State University);
- MBA in Projects Applied to Civil Construction;
- MBA in Construction Management;
- Civil Engineering.

Four years of experience in quality control management of concrete specimens manufactured in the laboratory and collection and characterization of soil samples;

Since 2017 as a researcher in the area of ​​risk analysis in radiological scenario, involving the impact of radiation from the ground, in urban and rural scenarios, considering climate change as the main external factor, and using the line of severe accidents as the main basis.