• Title/Summary/Keyword: KRR-2

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Application of In Situ Measurement for Site Remediation and Final Status Survey of Decommissioning KRR Site

  • Hong, Sang Bum;Nam, Jong Soo;Choi, Yong Suk;Seo, Bum Kyoung;Moon, Jei Kwon
    • Journal of Radiation Protection and Research
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    • v.41 no.2
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    • pp.173-178
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    • 2016

  • Background: In situ gamma spectrometry has been used to measure environmental radiation, assumptions are usually made about the depth distribution of the radionuclides of interest in the soil. The main limitation of in situ gamma spectrometry lies in determining the depth distribution of radionuclides. The objective of this study is to develop a method for subsurface characterization by in situ measurement. Materials and Methods: The peak to valley method based on the ratio of counting rate between the photoelectric peak and Compton region was applied to identify the depth distribution. The peak to valley method could be applied to establish the relation between the spectrally derived coefficients (Q) with relaxation mass per unit area (${\beta}$) for various depth distribution in soil. The in situ measurement results were verified by MCNP simulation and calculated correlation equation. In order to compare the depth distributions and contamination levels in decommissioning KRR site, in situ measurement and sampling results were compared. Results and Discussion: The in situ measurement results and MCNP simulation results show a good correlation for laboratory measurement. The simulation relationship between Q and source burial for the source layers have exponential relationship for a variety depth distributions. We applied the peak to valley method to contaminated decommissioning KRR site to determine a depth distribution and initial activity without sampling. The observed results has a good correlation, relative error between in situ measurement with sampling result is around 7% for depth distribution and 4% for initial activity. Conclusion: In this study, the vertical activity distribution and initial activity of $^{137}Cs$ could be identifying directly through in situ measurement. Therefore, the peak to valley method demonstrated good potential for assessment of the residual radioactivity for site remediation in decommissioning and contaminated site.

  • https://doi.org/10.14407/jrpr.2016.41.2.173 인용 PDF KSCI

Management of Metallic Radioactive Waste from Decontamination and Decommissioning of KRR 1&2 (KRR 1&2 제염$\cdot$해체에서 방사성 금속 고체폐기물의 관리)

  • 정기정;이동규;정경환;이근우;박진호
    • Proceedings of the Korean Radioactive Waste Society Conference
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    • 2003.11a
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    • pp.645-649
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    • 2003

  • The variety conditions and working situations during decontamination and decommissioning practice may cause the production of metallic wastes, which can differ in character or in quantity from the waste anticipated during D&D planning. The management of such kind of wastes involves the need to evaluate existing waste management system in order to determine how metallic wastes should be well handled and treated. In this study, the investigation of existing management practices which can be also applied to the metallic waste management, was carried. Simultaneously, assistance in selection of appropriate technologies and processes is investigated which can be used when anticipated situations occur during decontamination and decommissioning practice.

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