Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Optimization of spent nuclear fuels per canister to improve the disposal efficiency of a deep geological repository in Korea

  • Received : 2021.08.24
  • Accepted : 2022.02.18
  • Published : 2022.08.25
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Abstract

The disposal area of a deep geological repository (DGR) for the disposal of spent nuclear fuels (SNFs) is estimated considering the spacing between deposition holes and between disposal tunnels, as determined by a thermal analysis using the decay heat of a reference SNF. Given the relatively large amount of decay heat of the reference SNF, the disposal area of the DGR is found to be overestimated. Therefore, we develop a computer program using MATLAB, termed ACom (Assembly Combination), to combine SNFs when stored in canisters such that the decay heat per canister is evenly distributed. The stability of ACom was checked and the overall distribution of the decay heat per canister was analyzed. Finally, ACom was applied to disposal scenarios suggested in the conceptual design of a DGR for SNFs, and it was confirmed that the decay heat per canister could be evenly distributed and that the maximum decay heat of the canister could be much lower than that of a canister estimated using a reference SNF. ACom can be used to improve the disposal efficiency by reducing the disposal area of a DGR for SNFs by ensuringg a relatively even distribution of decay heat per canister.

Keywords

Acknowledgement

This work was supported by the Institute for Korea Spent Nuclear Fuel (iKSNF) and National Research Foundation of Korea (NRF) grant funded by the Korea government (Ministry of Science and ICT, MSIT) (No. NRF-2021M2E1A1085185).

References

  1. Ministry of Trade, Industry and Energy, The 8th Basic Plan for Electric Power Demand and Supply (2017~2031), Notice 2017-601, 2017.
  2. Atomic Energy Commission, Basic plan on the management of high-level wastes, July 25 (2016) 2016.
  3. Committee on the Reexamination of Policy for Spent Nuclear Fuel Management, Proposal of Recommendation on Policy for Spent Nuclear Fuel Management, 2021.
  4. J.Y. Lee, D.K. Cho, H.J. Choi, J.W. Choi, Concept of a Korean reference disposal system for spent fuels, J. Nucl. Sci. Technol. 44 (2) (2007) 1565-1573. https://doi.org/10.1080/18811248.2007.9711407
  5. J.Y. Lee, et al., An improved concept of deep geological disposal system considering arising characteristics of spent fuels from domestic nuclear power plants, J. Nucl. Fuel Cycle Waste Technol. 17 (4) (2019) 405-418. https://doi.org/10.7733/jnfcwt.2019.17.4.405
  6. C.H. Kim, et al., Management of High-Level Nuclear Waste, Hanlim Research Report-57, 2009.
  7. D.K. Cho, D.H. Kook, H.J. Choi, J.W. Choi, Development of a simplified source term estimation model for a spent fuel from Westinghouse-type Reactors, J. Kor. Radioact. Waste Soc. 8 (3) (2010) 239-245.
  8. Kari Ikonen, Thermal Analyses of Spent Nuclear Fuel Repository, 2003. POSIVA 2003-04.
  9. V. Solans, et al., Loading optimization for Swiss used nuclear fuel assemblies into final disposal canister, Nucl. Eng. Des. 370 (2020) 110897. https://doi.org/10.1016/j.nucengdes.2020.110897