Assessment of the environmental radiological impact in the emergency exposure phase through the simulation of a uranium mining tailings dam breach

R. J. A. Lamour; M. A. V. Wasserman; E. R. R. Rochedo; J. Lugon Junior

doi:10.15392/2319-0612.2023.2228

Authors

Rogério Lamour IRD / CNEN https://orcid.org/0000-0002-7076-9793
Angélica Wasserman Institute of Radiation Protection and Dosimetry (IRD) https://orcid.org/0000-0002-1396-1105
Elaine Rochedo Brazilian Nuclear Energy Commission (CNEN)
Jader Lugon Instituto Federal de Educação, Ciência e Tecnologia Fluminense https://orcid.org/0000-0001-8030-0713

DOI:

https://doi.org/10.15392/2319-0612.2023.2228

Keywords:

uranium tailings, dam breach, radiological assessment, FLO-2D

Abstract

This work is aiming at estimating the radiation doses to members of the public in case of an emergency exposure situation related to a hypothetical uranium mining tailings dam rupture at the UDC - Decommissioning Unit of Caldas, MG, Brazil. The calculations will help to managing the exposures of emergency workers and residents in the region downstream the dam. The computer code chosen to perform the simulations was FLO-2D^@ software. Due to the uncertainties involved, mainly regarding the waste rheology and activity concentrations and in parameters values to be used in the dose assessment, considerations were made for the study to present results derived from conservative assumptions. Through the creation of flood maps, it was possible to estimate the extent of the areas affected by the released materials. The results showed that in a scenario of the tailings dam breach, deposition of mud shall extend over 20 km downstream affecting an area of nearly 3 km². Total dose for a member of the public living in most affected areas would be around 43 mSv/y in the early phase after the accident. Although only shielding would be recommended under current radiation protection regulation, evacuation/relocation is suggested due to the presence of long-lived radionuclides. This protective measure would probably already be indicated by the accident itself, regardless of radiological reasons. More realistic assessment should be performed before returning people, considering long-term environmental transport and uses of the area. It must also be considered that long-term exposures have more restricted recommended acceptable levels than those for the emergency phase.

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References

NATIONAL RESEARCH COUNCIL, Uranium Mining in Virginia: Scientific, Technical, Environmental, Human Health and Safety, and Regulatory Aspects of Uranium Mining and Processing in Virginia. National Academies Press, Washington (DC), USA, 2011.

NEA/ OECD. Managing Environmental and Health Impacts of Uranium Mining. NEA No. 7062, OECD, 2014, 144 p

GOLDEN ASSOCIATES BRASIL CONSULTORIA E PROJETO LTDA. PRAD UTM CALDAS - Plano de Recuperação de Área Degradadas/INB UTM CALDAS. Relatório N°RT-006_099-515-3023_01-J. 2021. 561 p.

INDÚSTRIAS NUCLEARES DO BRASIL, Rio de Janeiro, Brazil. Available in: http://www.inb.gov.br/A-INB/Onde-estamos/Caldas. Last accessed: April, 2022.

Ministério Público Federal - MPF em Minas Gerais envia à CNEN e à INB proposta de TAC para barragem de rejeitos nucleares. Em : https://www.mpf.mp.br/mg/sala-de-imprensa/noticias-mg/mpf-mg-envia-a-cnen-e-a-inb-proposta-de-tac-para-barragem-de-rejeitos-nucleares. Last accessed in 26 January 2023.

O'BRIEN, J., & JULIEN, P. Physical Processes of Hyperconcentrated Sediment Flows. In Proceedings of the ASCE Specialty Conference on the Delineation of Landslides, Floods, and Debris Flow Hazards, 1985, pp. 260-279.

O'BRIEN, J., JULIEN, P., & FULLERTON, W. Two-Dimensional water flood and mudflow. Journal of Hydraulics Engineering, 119(2), 1993, pp. 244-259. DOI: https://doi.org/10.1061/(ASCE)0733-9429(1993)119:2(244)

QGIS - Um Sistema de Informação Geográfica livre e aberto. Available at: https://www.qgis.org/pt_BR/site/about/index.html. Last accessed: 17 May 2022.

FLO-2D. Tutorial documentation. Available at: https://flo-2d.com/. Last accessed: 2022

ALOS-PALSAR Advanced Land Observing Satellite (ALOS) Phased Arrayed type L Band SAR (PALSAR) project. Available at https://asf.alaska.edu/data-sets/sar-data-sets/alos-palsar/; last accessed: June 2022

MAPBIOMAS. Project of Brazilian Land Cover & Use Map Series. Available at: http://mapbiomas.org/pages/database/mapbiomas_collection; Last accessed: 04 May 2022.

SISEMA. Infraestrutura de Dados Espaciais do Sistema Estadual de Meio Ambiente e Recursos Hídricos. Available at: https://idesisema.meioambiente.mg.gov.br/webgis. Last accessed: May 2022.

IAEA. Generic procedure for assessment and response during a radiological emergency. IAEA TECDOC 1162. International Atomic Energy Agency, Vienna, 2000

IAEA. Generic models for use in assessing the impact of discharges of radioactive substances to the environment. IAEA Safety Report Series No. 19. International Atomic Energy Agency, Vienna, 2001.

IAEA. NORMALYSA. Available at: project.facilia.se/normalysa/software.html. Last accessed: Oct. 2022

ANL. RESRAD Family Codes. Available at: resrad.eos.anl.gog/dowload/. Last accessed: Oct 2022

CNEN. Norma CNEN 3.01 - Diretrizes Básicas de Proteção Radiológica. Comissão nacional De Energia Nuclear, Brazil, 2014.

LAURIA, D. C., ROCHEDO, E. R. R. The Legacy of Monazite Processing in Brazil. Radiation Protection Dosimetry, v. 114, n.4, p. 546-550, 2005. DOI: https://doi.org/10.1093/rpd/nci303

CNEN. - Coeficientes De Dose Para Exposição Do Público. Norma 3.01 - Posição Regulatória 3.01/011:2011 Available at: http://appasp.cnen.gov.br/seguranca/normas/pdf/ pr301_11.pdf. Last accessed: Oct. 2022.

SALINAS, I. C. P., CONTI, C. C., ROCHEDO, E. R. R., LOPES, R. T. Gamma shielding factor for typical houses in Brazil. Radiation Protection Dosimetry, Vol.121, No, 4, 2006, pp 420-424. DOI: https://doi.org/10.1093/rpd/ncl075

UNSCEAR. Sources and effects of ionizing radiation UNSCEAR 2000 report to the General Assembly, with scientific annexes Volume I: Sources. United Nations, New York, NY, USA, 2000.

ICRP. Basic Anatomical and Physiological Data for Use in Radiological Protection Reference Values. ICRP Publication 89. Ann. ICRP, 32 (3-4), 2002. DOI: https://doi.org/10.1016/S0146-6453(03)00002-2

IAEA. Handbook of Parameter Values for the Prediction of Radionuclide Transfer in Terrestrial and Freshwater Environments. IAEA Technical Report Series No. 472, International Atomic Energy Agency, Vienna, 2010

ANL. User's guide for RESRAD ONSITE Code Version 7.2. ANL/EVS/TM-18/1. Argonne National Laboratory, USA, 2018.

IAEA, 2014. Radiation Protection and Safety of radiation sources: International Basic Safety Standards. IAEA. Generic Safety Requirements- GRS Part 3. International Atomic Energy Agency, Vienna, 2014.

ICRP. Application of the Commission's Recommendations for the protection of people in emergency exposure situations. ICRP publication 109. Clement C.H. Ed., Annals of the ICRP V.39 N.1, Elsevier, 2009

RAMAN, A., & LIU, F. An Investigation of the Brumadinho Dam Break with HEC RAS Simulation. arXiv: 1911.05219. Cornell University, 2019

Periodic Safety Review Vale TUV SUD (2017), Available at: https://worldminetailingfailures.org/wpcontent/uploads/2019/03/TUV_SUD_2017_Periodic_Safety_Review.en_.pdf. Last accessed: May 2022

GOOGLE. Google Earth. Available at: https://earth.google.com/web/. Last accessed: Nov. 2022.

ANM - https://anmlegis.datalegis.inf.br/action/ActionDatalegis.php?acao=abrirTextoAto&link=S&tipo=RES&numeroAto=00000032&seqAto=000&valorAno=2020&orgao=ANM/MME&codTipo=&desItem=&desItemFim=&cod_modulo=351&cod_menu=6675. Last accessed: Jan. 2023

O'BRIEN, J., & JULIEN, P. Laboratory analysis of mudflow properties. J. of Hyd. Eng., ASCE, 114(8), 1988, p.877-887. DOI: https://doi.org/10.1061/(ASCE)0733-9429(1988)114:8(877)

SICAR - NATIONAL RURAL ENVIRONMENTAL REGISTRATION SYSTEM. Available at: https://www.car.gov.br/publico/ municipios/ downloads? sigla=MG. Last accessed: 04 May 2022.

GOV.BR - https://legislacao.presidencia.gov.br/atos/?tipo=LEI&numero=12651&ano=2012&ato=a48QTVU1kMVpWT59b. Last accessed: Jan. 2023

VEIGA, L.H.S.; KOIFMAN, S.; MELO, V.P.; SACHETT, I.; AMARAL. E.C.S. Preliminary indoor risk assessment at the Poços de Caldas plateau, MG, Brazil. Journal of Environmental Radioactivity V.70 N. 3, 2003, pp.161-173. DOI: https://doi.org/10.1016/S0265-931X(03)00101-2