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- W3118875478 abstract "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 programâneutron 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 6.97Ã10â1 mSv/hr and 2 m from it is 3.03Ã10â2 mSv/hr. For RVI cut-off ones, on the surface of it is 0.166Ã10â1 mSv/hr and 2 m from it is 1.04Ã10â1 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 wastesâILW, LLW, and VLLW. Keywords: Monte Carlo, Cask, Drum, Reactor Pressure Vessel, Internal, Decommissioning" @default.
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- W3118875478 date "2020-12-30" @default.
- W3118875478 modified "2023-10-15" @default.
- W3118875478 title "Study on Dose Rate on the Surface of Cask Packed with Activated Cut-off Pieces from Decommissioned Nuclear Power Plant" @default.
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- W3118875478 doi "https://doi.org/10.14407/jrpr.2020.45.4.178" @default.
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