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14CO2 dispersion around two PWR nuclear power plants in Brazil.

Dias, C M; Stenström, Kristina LU ; Leao, I L B; Santos, R V; Nicoli, I G; Skog, Göran LU ; Ekström, Peter LU and da Silveira Correa, R (2009) In Journal of Environmental Radioactivity 100(7). p.574-580
Abstract
Atmospheric air samples were taken within 3 km from power plants encompassing five different distances and wind directions. Samples were taken between 2002 and 2005 aiming to evaluate the environmental C-14 enrichment due to the operation of Brazilian nuclear power plants. The sampling system consisted of a pump connected to a trapping column filled with a 3 M NaOH solution. The trapped C-14 by using a single stage accelerator mass spectrometry (SSAMS). CO2 was analyzed for All sampling sites revealed measurable C-14 excess values. The maximum excesses were of 15 and 14 mBq/m(3) for sampling sites placed at NE of the power plants, which is the main wind direction in the area. The mean excesses values were 12 mBq/m(3) to the NE direction, 8... (More)
Atmospheric air samples were taken within 3 km from power plants encompassing five different distances and wind directions. Samples were taken between 2002 and 2005 aiming to evaluate the environmental C-14 enrichment due to the operation of Brazilian nuclear power plants. The sampling system consisted of a pump connected to a trapping column filled with a 3 M NaOH solution. The trapped C-14 by using a single stage accelerator mass spectrometry (SSAMS). CO2 was analyzed for All sampling sites revealed measurable C-14 excess values. The maximum excesses were of 15 and 14 mBq/m(3) for sampling sites placed at NE of the power plants, which is the main wind direction in the area. The mean excesses values were 12 mBq/m(3) to the NE direction, 8 mBq/m to the E, 10 mBq/m to the N, 8 mBq/m(3) to the WNW and 7 mBq/m(3) to the W direction (increasing distances from NE to W). Compared to other Light Water Reactors (LWR) data, these means' values are significantly higher than the average worldwide reported value of 3 mBq/m(3). Available data indicate that the observed values are not related to C-14 emission by the power plants vent stack. Other factors, such as topography, seem to have an important role because it affects wind dispersion thus favoring C-14 accumulation in the sampled area. Moreover, the high elevations around the power plants enhance the chances to measure high values of C-14 since the plume can be intercepted before it is drawn to the ground. Modeling of the plume has shown that its dispersion does not follow a Gaussian model and that agreement between atmospheric CO2 and vegetation C-14 activities occurs only for sampling sites placed at NE of the power plants. (c) 2009 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Atmospheric air, C-14, Nuclear power plant, PWR, Dispersion, plume, Gaussian
in
Journal of Environmental Radioactivity
volume
100
issue
7
pages
574 - 580
publisher
Elsevier
external identifiers
  • wos:000267176900007
  • scopus:65649138380
ISSN
1879-1700
DOI
10.1016/j.jenvrad.2009.03.022
language
English
LU publication?
yes
id
4cba7a78-d4e2-4e23-81c9-77a1f0c4e79a (old id 1424169)
date added to LUP
2009-06-18 12:41:22
date last changed
2017-01-01 04:25:39
@article{4cba7a78-d4e2-4e23-81c9-77a1f0c4e79a,
  abstract     = {Atmospheric air samples were taken within 3 km from power plants encompassing five different distances and wind directions. Samples were taken between 2002 and 2005 aiming to evaluate the environmental C-14 enrichment due to the operation of Brazilian nuclear power plants. The sampling system consisted of a pump connected to a trapping column filled with a 3 M NaOH solution. The trapped C-14 by using a single stage accelerator mass spectrometry (SSAMS). CO2 was analyzed for All sampling sites revealed measurable C-14 excess values. The maximum excesses were of 15 and 14 mBq/m(3) for sampling sites placed at NE of the power plants, which is the main wind direction in the area. The mean excesses values were 12 mBq/m(3) to the NE direction, 8 mBq/m to the E, 10 mBq/m to the N, 8 mBq/m(3) to the WNW and 7 mBq/m(3) to the W direction (increasing distances from NE to W). Compared to other Light Water Reactors (LWR) data, these means' values are significantly higher than the average worldwide reported value of 3 mBq/m(3). Available data indicate that the observed values are not related to C-14 emission by the power plants vent stack. Other factors, such as topography, seem to have an important role because it affects wind dispersion thus favoring C-14 accumulation in the sampled area. Moreover, the high elevations around the power plants enhance the chances to measure high values of C-14 since the plume can be intercepted before it is drawn to the ground. Modeling of the plume has shown that its dispersion does not follow a Gaussian model and that agreement between atmospheric CO2 and vegetation C-14 activities occurs only for sampling sites placed at NE of the power plants. (c) 2009 Elsevier Ltd. All rights reserved.},
  author       = {Dias, C M and Stenström, Kristina and Leao, I L B and Santos, R V and Nicoli, I G and Skog, Göran and Ekström, Peter and da Silveira Correa, R},
  issn         = {1879-1700},
  keyword      = {Atmospheric air,C-14,Nuclear power plant,PWR,Dispersion,plume,Gaussian},
  language     = {eng},
  number       = {7},
  pages        = {574--580},
  publisher    = {Elsevier},
  series       = {Journal of Environmental Radioactivity},
  title        = {14CO2 dispersion around two PWR nuclear power plants in Brazil.},
  url          = {http://dx.doi.org/10.1016/j.jenvrad.2009.03.022},
  volume       = {100},
  year         = {2009},
}