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A Study on the Inventory Estimation for the Activated Bioshield Concrete of KRR-2
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 Title & Authors
A Study on the Inventory Estimation for the Activated Bioshield Concrete of KRR-2
Hong, Sang Bum; Seo, Bum Kyoung; Cho, Dong Keun; Jeong, Gyeong Hwan; Moon, Jei Kwon;
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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 , , , , , and . 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 , , and 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.
Inventory;Activation;Bioshield concrete;Decommissioning;
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