Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Verification of the adequacy of domestic low-level radioactive waste grouping analysis using statistical methods

  • Lee, Dong-Ju (Radwaste Management Center, Korea Atomic Energy Research Institute (KAERI)) ;
  • Woo, Hyunjong (Euclidsoft) ;
  • Hong, Dae-Seok (Radwaste Management Center, Korea Atomic Energy Research Institute (KAERI)) ;
  • Kim, Gi Yong (Radioactive Waste Chemical Analysis Center, Korea Atomic Energy Research Institute (KAERI)) ;
  • Oh, Sang-Hee (Radwaste Management Center, Korea Atomic Energy Research Institute (KAERI)) ;
  • Seong, Wonjun (Decommissioning Technology Research Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Im, Junhyuck (Decommissioning Technology Research Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Yang, Jae Hwan (Department of Environmental & IT Engineering, Chungnam National University)
  • Received : 2021.11.05
  • Accepted : 2022.01.07
  • Published : 2022.07.25
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Abstract

The grouping analysis is a method guided by the Korea Radioactive Waste Agency for efficient analysis of radioactive waste for disposal. In this study, experiments to verify the adequacy of grouping analysis were conducted with radioactive soil, concrete, and dry active waste in similar environments. First, analysis results of the major radionuclide concentrations in individual waste samples were reviewed to evaluate whether wastes from similar environments correspond to a single waste stream. As a result, the soil and concrete waste were identified as a single waste stream because the distribution range of radionuclide concentrations was "within a factor of 10", the range that meet the criterion of the U.S. Nuclear Regulatory Commission for a single waste stream. On the other hand, the dry active waste was judged to correspond to distinct waste streams. Second, after analyzing the composite samples prepared by grouping the individual samples, the population means of the values of "composite sample analysis results/individual sample analysis results" were estimated at a 95% confidence level. The results showed that all evaluation values for soil and concrete waste were within the set reference values (0.1-10) when five-package and ten-package grouping analyses were conducted, verifying the adequacy of the grouping analysis.

Keywords

Acknowledgement

This work was supported by a research grant from the Korea Atomic Energy Research Institute (KAERI) [Grant No. 521220-21, South Korea] and [Grant No. 521240-21, South Korea] and Nuclear Research & Development Program (Grant No. 2019M2C9A1059067) of the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (MIST).

References

  1. Y.-J. Choi, S.-C. Lee, C.-L. Kim, Proposal for effective disposal options of very low level decommissioning waste, Prog. Nucl. Energy 94 (2017) 36-45, https://doi.org/10.1016/j.pnucene.2016.10.001.
  2. Korea Institute of Nuclear Safety, Status of Radioactive Waste Storage at the 4th Quarter of 2020, Waste Comprehensive Information Database, Korea Institute of Nuclear Safety, 2021. http://www.kins.re.kr/wacid.
  3. S.-C. Bae, J. Park, Status and research progress of nuclear decommissioning concrete waste disposal, J. Korean Recycl. Constr. Resour. Inst. 15 (2020) 45-51, https://doi.org/10.14190/MRCR.2020.15.2.045.
  4. International Atomic Energy Agency, Characteristics of Radioactive Waste Forms Conditioned for Storage and Disposal: Guidance for the Development of Waste Acceptance Criteria, IAEA-TECDOC-285, International Atomic Energy Agency, Vienna, 1983.
  5. M.H. Ahn, S.C. Lee, K.J. Lee, Disposal concept for LILW in Korea: characterization methodology and the disposal priority, Prog. Nucl. Energy 51 (2009) 327-333, https://doi.org/10.1016/j.pnucene.2008.07.001.
  6. Nuclear Safety and Security Commission, Regulations for the Waste Acceptance of Low and Intermediate Level Radioactive Waste, 2021. Notice No. 2021-26.
  7. J.W. Yeon, B.M. Kang, N.U. Kim, Chemical Analysis of Radioactive Materials, No. KAERI/RR-4323/2017, Korea Atomic Energy Research Institute, 2018.
  8. K. Jee, H. Ahn, A Strategy on the Disposal of below Intermediate Level Rad-wastes (No. KAERI/RR-4041/2015), Korea Atomic Energy Research Institute, 2015.
  9. Korea Radioactive Waste Agency, Waste Acceptance Criteria for the 1st Phase Disposal Facility of the Wolsong Low- and Intermediate-Level Waste Disposal Center (No. WAC-SIL-2020-1), 2020.
  10. J.B. Park, J.T. Jeong, J.-W. Park, Development of the safety case program for the Wolsong low- and intermediate-level radioactive waste disposal facility in Korea, J. Nucl. Fuel Cycle Waste Technol. 12 (2014) 335-344, https://doi.org/10.7733/jnfcwt.2014.12.4.335.
  11. Nuclear Safety and Security Commission, Criteria for Structure and Equipment of the Low- and Intermediate-Level Radioactive Waste Repository, 2017. Notice No. 2017-59.
  12. J.B. Park, H.R. Jung, E.Y. Lee, C.L. Kim, G.Y. Kim, K.S. Kim, Y.K. Koh, K.W. Park, J.H. Cheong, C.W. Jeong, J.S. Choi, K.D. Kim, Wolsong low-and intermediate-level radioactive waste disposal center: progress and challenges, Nucl. Eng. Technol. 41 (2009) 477-492, https://doi.org/10.5516/NET.2009.41.4.477.
  13. Y. Shin, J. Lee, The status and experiences of LILW disposal facility construction, J. Korean Soc. Miner. Energy Resour. Eng. 54 (2017) 389-396, https://doi.org/10.12972/ksmer.2017.54.4.389.
  14. International Atomic Energy Agency, Disposal Aspects of Low and Intermediate Level Decommissioning Waste: Results of a Coordinated Research Project 2002-2006, IAEA-TECDOC-1572, International Atomic Energy Agency, Vienna, 2007, http://www-pub.iaea.org/MTCD/publications/PDF/TE_1572_web.pdf.
  15. International Atomic Energy Agency, Classification of Radioactive Waste, IAEA Safety Standards Series No. GSG-1, International Atomic Energy Agency, Vienna, 2009.
  16. US Nuclear Regulatory Commission, Concentration Averaging and Encapsulation Branch Technical Position, Revision 1, vol. 1, Federal Register 80, US Nuclear Regulatory Commission, Washington, DC, 2015.
  17. K.J. Lee, M.C. Song, G.H. Hwang, C.M. Lee, D.S. Yuk, S.C. Lee, Research on the Assessment Technology of the Radionuclide Inventory for the Radioactive Waste Disposal (No. KINS/HR-590), Korea Institute of Nuclear Safety, 2004.
  18. W.K. Hastings, Monte Carlo sampling methods using Markov chains and their applications, Biometrika 57 (1970) 97-109, https://doi.org/10.1093/biomet/57.1.97.
  19. H. Kim, J. Bae, M. Lee, S. Lee, E. Lee, J. Lee, Introduction to Statistics, third ed., Jungik, Korea, 2019.
  20. S.-H. Kim, J. Yeom, I.-S. Baek, J.-S. Kim, S.-I. Sung, Determining the statistical sample size for reliability testing, J. Appl. Reliab. 20 (2020) 84-93, https://doi.org/10.33162/jar.2020.3.20.1.84.
  21. J.W. Tukey, Exploratory Data Analysis, Addison-Wesley, United States, 1977.
  22. K. Potter, H. Hagen, A. Kerren, P. Dannenmann, Methods for Presenting Statistical Information: the Box Plot, Vis. Large Unstructured Data Sets, vol. 4, 2006, pp. 97-106.
  23. R. Dawson, How significant is a boxplot outlier? J. Stat. Educ. 19 (2) (2011) https://doi.org/10.1080/10691898.2011.11889610.