Investigation of the near-range dispersion of particles unexpectedly released from a nuclear power plant using CFD

Barbero, Rubén and Cuadra, Daniel and Domingo Guijarro, Jerónimo and Iranzo, Alfredo and Gallego Díaz, Eduardo F. (2015). Investigation of the near-range dispersion of particles unexpectedly released from a nuclear power plant using CFD. "Environmental Fluid Mechanics", v. 15 (n. 1); pp. 67-83. ISSN 1573-1510. https://doi.org/10.1007/s10652-014-9359-y.

Description

Title: Investigation of the near-range dispersion of particles unexpectedly released from a nuclear power plant using CFD
Author/s:
  • Barbero, Rubén
  • Cuadra, Daniel
  • Domingo Guijarro, Jerónimo
  • Iranzo, Alfredo
  • Gallego Díaz, Eduardo F.
Item Type: Article
Título de Revista/Publicación: Environmental Fluid Mechanics
Date: 2015
ISSN: 1573-1510
Volume: 15
Subjects:
Freetext Keywords: CFD model; Particle release; Atmospheric particle dispersion; Nuclear power plan
Faculty: E.T.S.I. Industriales (UPM)
Department: Ingeniería Energética
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

An event in November 2007 in Ascó-1 nuclear power plant (NPP) in Spain, originated the release of a significant amount of active metallic particles through the discharge stack. Particles were dispersed and deposited in roofs and neighbouring areas within the NPP controlled area. However, the event was not detected until March 2008. More than 1,300 active points with radioactive particles were found, 94 % located inside the double fenced controlled area and 6 % within the exclusion area; 5 particles were found out of the exclusion area. To provide additional insights on the potential consequences of the release, a computational fluid dynamics (CFD) code, ANSYS-CFX-11, has been used to investigate the near-range atmospheric dispersion and deposition of the particles. The purpose of the analysis was to assess the distance travelled by particles of different sizes. A very detailed model of the site was built, taking into account the buildings and the terrain features including the river valley and the surrounding hills. The modelled domain was 3.2×5.2km, with the atmospheric layer up to 4 km height. The atmospheric conditions recorded during the different periods of time between November 2007 and January 2008 were classified into 37 representative categories. In general, the distribution of the particles found was adequately reproduced by the numerical model. Particles larger than 100μm could not travel beyond the double fence. Particles between 50and100μm could have been deposited mainly within the exclusion area, with a small probability of travelling farther. Smaller particles could have travelled beyond, but also should have been deposited in the nearby area, while the majority of particles found are larger, thus indicating that the size of the released particles should be above 50μm. The detailed CFD simulation allowed answering relevant questions concerning the possibility of having an impacted region larger than the exclusion area.

More information

Item ID: 67690
DC Identifier: https://oa.upm.es/67690/
OAI Identifier: oai:oa.upm.es:67690
DOI: 10.1007/s10652-014-9359-y
Official URL: https://link.springer.com/article/10.1007%2Fs10652-014-9359-y
Deposited by: Memoria Investigacion
Deposited on: 12 Jul 2021 14:42
Last Modified: 12 Jul 2021 14:42
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