title: Estimation of 85Kr dispersion from the spent nuclear fuel reprocessing plant in Rokkasho, Japan, using an atmospheric dispersion model.
abstract: The spent nuclear fuel reprocessing plant of Japan Nuclear Fuel Limited (JNFL) located in Rokkasho, Japan, discharged small amounts of (85)Kr into the atmosphere during final tests of the plant with actual spent fuel from 31 March 2006 to October 2008. During this period, the gamma-ray dose rates due to discharged (85)Kr were higher than the background rates measured at the Institute for Environmental Sciences and at seven monitoring stations of the Aomori prefectural government and JNFL. The dispersion of (85)Kr was simulated by means of the fifth-generation Penn State/NCAR Mesoscale Model and the CG-MATHEW/ADPIC models (ver. 5.0) with a vertical terrain-following height coordinate. Although the simulated gamma-ray dose rates due to discharged (85)Kr agreed fairly well with measured rates, the agreement between the estimated monthly mean (85)Kr concentrations and the observed concentrations was poor. Improvement of the vertical flow of air may lead to better estimation of (85)Kr dispersion.
authors.affiliation: Institute for Environmental Sciences, 1-7 Ienomae, Obuchi, Rokkasho, Aomori, Japan abe@ies.or.jp.
authors.forename: K
authors.initials: K
authors.lastname: Abe
authors.affiliation: Institute for Environmental Sciences, 1-7 Ienomae, Obuchi, Rokkasho, Aomori, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Iyogi
authors.affiliation: Institute for Environmental Sciences, 1-7 Ienomae, Obuchi, Rokkasho, Aomori, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Kawabata
authors.affiliation: Japan NUS Co. Ltd., Nishi-Shinjuku Kimuraya Building 5F, 7-5-25 Nishi-Shinjuku, Shinjuku-ku, Tokyo, Japan.
authors.forename: J H
authors.initials: JH
authors.lastname: Chiang
authors.affiliation: Japan NUS Co. Ltd., Nishi-Shinjuku Kimuraya Building 5F, 7-5-25 Nishi-Shinjuku, Shinjuku-ku, Tokyo, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Suwa
authors.affiliation: Institute for Environmental Sciences, 1-7 Ienomae, Obuchi, Rokkasho, Aomori, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Hisamatsu
mesh_terms: D000396:Air Pollutants, Radioactive / Q000032:analysis*; D001272:Atmosphere / Q000032:analysis / Q000737:chemistry*; D003198:Computer Simulation; D007564:Japan; D007727:Krypton Radioisotopes / Q000032:analysis*; D015233:Models, Statistical; D009688:Nuclear Reactors; D011834:Radiation Monitoring / Q000379:methods*; D011850:Radioactive Waste / Q000032:analysis* / Q000517:prevention & control*; D059027:Recycling
chemical_list: D000396:Air Pollutants, Radioactive; D007727:Krypton Radioisotopes; D011850:Radioactive Waste