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KMID : 0364920120370040202
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Journal of Radiation Protection and Research
2012 Volume.37 No. 4 p.202 ~ p.207
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A Study on the Inventory Estimation for the Activated Bioshield Concrete of KRR-2
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Hong Sang-Bum
Seo Bum-Kyoung
Cho Dong-Keun
Jeong Gyeong-Hwan
Moon Jei-Kwon
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Abstract
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The radioactivity inventory significantly affects all steps of decommissioning projects including planning, cost estimation, risk assessment, waste management and site remediation. The decommissioning project of the KRR-2 was completed in 2009 and a large amount of activated concrete waste was generated. The bioshield concrete, containing minute amount of impurity elements, was activated by neutron reaction during the operation of the reactor. A variety radionuclides was generated in the concrete, including 3H, 14C, 55Fe, 60Co 63Ni, 134Cs, 152Eu and 154Eu. In this paper, the comparison between the calculated results and previous measured results was carried out to estimate the inventory of the bioshield concrete of the KRR-2. The combined computer codes of MCNP5 and ORIGEN 2.1 for calculation of the distribution of neutron flux, cross-section and generation of radionuclides were used. The results were shown that 99.8% of the total radioactivity of 3H, 55Fe, 60Co and 152Eu in the bioshield concrete 12 years after shutdown. The effects on the variation of inventory were analysed depending on the operation periods and the cooling times in the bioshield concrete.
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KEYWORD
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Inventory, Activation, Bioshield concrete, Decommissioning
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