Drying and characterization of evaporator concentrates coming from PWR

Érica Rodrigues de Faria; Clédola Cássia Oliveira de Tello

doi:10.15392/bjrs.v9i1A.1530

Authors

Érica Rodrigues de Faria Centro de Desenvolvimento da Tecnologia Nuclear
Clédola Cássia Oliveira de Tello Centro de Desenvolvimento da Tecnologia Nuclear

DOI:

https://doi.org/10.15392/bjrs.v9i1A.1530

Keywords:

Evaporator concentrates, drying, characterization

Abstract

In order to control the fission, boric acid is added to the water of primary circuit inside a Pressurized Water Reactor (PWR). After used, this solution is treated in evaporator to reduce its volume, generating the evaporator concentrate (EC). This concentrate should be solidify for transported and storage. Cementation is one of available process to incorporate the concentrate. However, when the evaporator concentrate is cemented there is an increase in the volume of the final product. It is proposed to use an additional process, drying prior be to the cementation. This process is applicable to further reduce the waste volume to be solidificated reducing the number of waste packages, consequently decreasing the storage area and all related risks. Two equipment, lab oven and spray dryer were studied to treat the evaporator concentrate. The dried EC was characterized, and the density, the particle size and the surface area were determined. After drying the evaporator concentrates solution, there was more than 80% weight reduction and initially, the dried product of the spray dryer showed better conditions to be incorporated in cementitious matrix.

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Author Biographies

Érica Rodrigues de Faria, Centro de Desenvolvimento da Tecnologia Nuclear

Graduated in Chemical Engineering and Master in Science and Technology of Radiation, Minerals and Materials.

Clédola Cássia Oliveira de Tello, Centro de Desenvolvimento da Tecnologia Nuclear

Doctor in Chemical Engineering and Master in Nuclear Engineering.

References

INTERNATIONAL ATOMIC ENERGY AGENCY, Radiation, People and Environment, IAEA/PI/A.75 / 04-00391, Vienna, 2004.

INTERNATIONAL ATOMIC ENERGY AGENCY. Nuclear Power Reactors in the World, IAEA-RDS-2/37. Vienna, 2017.

J.A. Perrota, Curso de Introdução à Engenharia do Núcleo dos Reatores, IPEN, São Paulo, 1999.

BEZERRA, J. L., LIRA, C.A.B.O., BARROSO, A.C.O., LIMA, F.R.A., SILVA, M.A.B., FILHO, H. J.B.L. Processo de homogeneização do boro em reatores a água pressurizada utili-zando bancada experimental de baixa pressão. In: CONGRESSO NACIONAL DE ENGEN-HARIA MECÂNICA, 2012, São Luís, Annals…, São Luís, 2012.

INTERNATIONAL ATOMIC ENERGY AGENCY. Design and operation of evaporators for radioactive wastes. TECHNICAL REPORTS SERIES No. 87, Vienna, 1967.

HAUCZ, M. J. A., CALÁBRIA, J.A.A., TELLO, C.C.O., CÂNDIDO, F.D., SALES, S.R.N. Ensaios de lixiviação em produtos cimentados contendo rejeit simulado de concentrado do evaporador de reator PWR. In : INTERNATIONAL JOINT CONFERENCE, 2011, Recife, Annals..., Recife, AIEA, 2011.

CENTRO DE DESENVOLVIMENTO DA TECNOLOGIA NUCLEAR. Otimização da metodologia de solidificação do rejeito da usina de Angra 1. Relatório final, Belo Horizonte, Minas Gerais, 2001.

ANTON, S. and MILAN, Z. Borate compound content reduction in liquid radioactive waste from nuclear power plants with VVER reactor. In: INTERNATIONAL CONFERENCE IN CENTRAL EUROPE, 2000, Plzen, Annals..., Plzen, 2000.

HERNÁNDEZ, S. GUERRERO, A. GOÑI, S. Leaching of borate waste cement matrices: pore solution and solid phase characterization. Advances in Cement Research, v. 12, n. 1. p. 1-8, 2000.

COUMES, C. C. D; COURTOIS, S. Cementation of a low-level radioactive waste of complex chemistry investigation of the combined action of borate, chloride, sulfate and phosphate on cement hydration using response surface methodology. Cement and Concrete Research,v.33, p. 305-316. 2003.

SUN, Q. HU, J., WANG, J., Optimization of composite admixtures used in cementation formula for radioactive evaporator concentrates. Progress in Nuclear Energy. v.70. p. 1-5. 2014.

COMISSÃO NACIONAL DA ENERGIA NUCLEAR. CNEN NN 8.02: Licenciamento de Depósitos de Rejeitos Radioativos de Baixo e Médio Níveis de Radiação. Rio de Janeiro, 2014.

COMISSÃO NACIONAL DA ENERGIA NUCLEAR. CNEN NN 6.09: Critérios de aceit-ação para deposição de rejeitos radioativos de baixo e médio níveis de radiação. Rio de Janei-ro, 2002.

SUN, Q., LI, J. WANG, J. “Effect of borate concentration on solidification of radioactive wastes by different cements”. Nuclear Engineering and Design, v. 241, p.4341- 4345, 2011.

SHI C. & SPENCE R.; “Designing of Cement-Based Formula for Solidification/Stabilization of Hazardous, Radioactive, and Mixed Wastes”. Critical Reviews in Environmental Science and Technology, v. 34. p. 391–417, 2004.

INTERNATIONAL ATOMIC ENERGY AGENCY. Selection of Technical Solutions for the Management of Radioactive Waste. IAEA-TECDOC-1817. Vienna: IAEA, 2017.

R.H. PERRY & D.W. GREEN, Perry’s Chemical Engineers’ Handbook, 8thed, New York: The McGraw-Hill, 2008.

CUSIDÓ, J. A., CREMADES, L.V. “Atomized sludges via spray drying at low temperatures: An alternative to conventional wastewater treatment plants”. Journal of Environmental Management, v. 105, p.p. 61-65, 2012.

FINKBEINER, R. Conditioning of special waste material with the FAVORIT vacuum drying facility. In : WM’00 Conference, 2000, Tucson, Annals..., Tucson, 2000.

TOSCANO, R. A., Proposição de Processo de Tratamento de Resina e Concentrado de Evaporador Provenientes de Usinas Nucleares para o Armazenamento em Repositório de Superfície. Centro de Desenvolvimento da Tecnologia Nuclear, Belo Horizonte, 2017.

FARIA, E. R. Estabelecimento de Parâmetros de Secagem e cimentação do Concentrado de Evaporador proveniente de usina nuclear. Centro de Desenvolvimento da Tecnologia Nu-clear, Belo Horizonte, 2019.

MUJUMDAR, A. S. Handbook of industrial drying. 3nd.ed. Singapura: CRC Press, 2006.

CUSIDÓ, J. A., CREMADES, L.V. “Atomized sludges via spray drying at low temperatures: An alternative to conventional wastewater treatment plants”. Journal of Environmental Management, v. 105, p. 61-65, 2012.