title: Impacts of (14)C discharges from a nuclear fuel reprocessing plant on surrounding vegetation: Comparison between grass field measurements and TOCATTA-χ and SSPAM(14)C model computations.
abstract: This article compares and discusses the ability of two different models to reproduce the observed temporal variability in grass (14)C activity in the vicinity of AREVA-NC La Hague nuclear fuel reprocessing plant in France. These two models are the TOCATTA-χ model, which is specifically designed for modelling transfer of (14)C (and tritium) in the terrestrial environment over short to medium timescales (days to years), and SSPAM(14)C, which has been developed to model the transfer of (14)C in the soil-plant-atmosphere with consideration over both short and long timescales (days to thousands of years). The main goal of this article is to discuss the strengths and weaknesses of the models studied, and to investigate if modelling could be improved through consideration of a much higher level of detail of plant physiology and/or higher number of plant compartments. These models have been applied here to the La Hague field data as it represents a medium term data set with both short term variation and a sizeable time series of measurements against which to compare the models. The two models have different objectives in terms of the timescales they are intended to be applied over, and thus incorporate biological processes, such as photosynthesis and plant growth, at different levels of complexity. It was found that the inclusion of seasonal dynamics in the models improved predictions of the specific activity in grass for such a source term of atmospheric (14)C.
authors.affiliation: Quintessa Limited, 633/635 Birchwood Boulevard, WA3 7QU, Warrington, United Kingdom. Electronic address: lauralimer@quintessa.org.
authors.forename: Laura M C
authors.initials: LM
authors.lastname: Limer
authors.affiliation: Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PRP-ENV, SERIS, LM2E, Cadarache, Saint-Paul Lez Durance, France.
authors.forename: Séverine
authors.initials: S
authors.lastname: Le Dizès-Maurel
authors.affiliation: Aleksandria Sciences Limited, S7 2DD, Sheffield, United Kingdom.
authors.forename: Ryk
authors.initials: R
authors.lastname: Klos
authors.affiliation: Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PRP-ENV, SERIS, LM2E, Cadarache, Saint-Paul Lez Durance, France.
authors.forename: Denis
authors.initials: D
authors.lastname: Maro
authors.affiliation: Swedish Radiation Safety Authority, SE-171 16, Stockholm, Sweden.
authors.forename: Maria
authors.initials: M
authors.lastname: Nordén
mesh_terms: D000396:Air Pollutants, Radioactive / Q000378:metabolism*; D002250:Carbon Radioisotopes / Q000378:metabolism*; D005602:France; D008129:Lolium / Q000502:physiology*; D008962:Models, Theoretical; D055848:Nuclear Power Plants; D011834:Radiation Monitoring / Q000379:methods*
chemical_list: D000396:Air Pollutants, Radioactive; D002250:Carbon Radioisotopes
keywords: (14)C compartment model; Atmospheric exchange; Environment; Pasture; Plant physiological functioning