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KMID : 0364920200450040178
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Journal of Radiation Protection and Research
2020 Volume.45 No. 4 p.178 ~ p.186
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Study on Dose Rate on the Surface of Cask Packed with Activated Cut-off Pieces from Decommissioned Nuclear Power Plant
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Park Kwang-Soo
Kim Hae-Woong
Sohn Hee-Dong
Kim Nam-Kyun
Lee Chung-Kyu
Lee Yun
Lee Ji-Hoon
Hwang Young-Hwan
Lee Mi-Hyun
Lee Dong-Kyu
Jung Duk-Woon
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Abstract
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Background: Reactor pressure vessel (RV) with internals (RVI) are activated structures by neutron irradiation and volume contaminated wastes. Thus, to develop safe and optimized disposal plan for them at a disposal site, it is important to perform exact activation calculation and evaluate the dose rate on the surface of casks which contain cut-off pieces.
Materials and Methods: RV and RVI are subjected to neutron activation calculation via Monte Carlo methodology with MCNP6 and ORIGEN-S program?neutron flux, isotopic specific activity, and gamma spectrum calculation on each component of RV and RVI, and dose rate evaluation with MCNP6.
Results and Discussion: Through neutron activation analysis, dose rate is evaluated for the casks containing cut-off pieces produced from decommissioned RV and RVI. For RV cut-off ones, the highest value of dose rate on the surface of cask is 6.97×10?1 mSv/hr and 2 m from it is 3.03×10?2 mSv/hr. For RVI cut-off ones, on the surface of it is 0.166×10?1 mSv/hr and 2 m from it is 1.04×10?1 mSv/hr. Dose rates for various RV and RVI cut-off pieces distributed lower than the limit except the one of 2 m from the cask surface of RVI. It needs to adjust contents in cask which carries highly radioactive components in order to decrease thickness of cask.
Conclusion: Two types of casks are considered in this paper: box type for very-low-level waste (VLLW) as well as low-level waste (LLW) and cylinder type for intermediate-level waste (ILW). The results will contribute to the development of optimal loading plans for RV and RVI cut-off pieces during the decommissioning of nuclear power plant that can be used to prepare radioactive waste disposal plans for the different types of wastes?ILW, LLW, and VLLW.
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KEYWORD
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Monte Carlo, Cask, Drum, Reactor Pressure Vessel, Internal, Decommissioning
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