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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2019.1
- 수록면
- 1,707 - 1,714 (8page)
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The purpose of the critical evaluation of the spent fuel pool (SFP) is to verify that the maximum effectivemultiplication factor (Keff) is less than the critical safety limit at 100% stored condition of the spent fuelwith the maximum reactivity. At nuclear power plants, the storage standard of spent fuel, ie, the loadingcurve, is established to prevent criticality from being generated in SFP. Here, the loading curve refers to agraph showing the minimum discharged burnup versus the initial enrichment of spent fuel. Recently, USNRC proposed the new critical safety assessment guideline (DSS-ISG-2010-01, Revision 0) of PWR SFPsand most of utilities in US is following it. Of course, the licensed criterion of the maximum effectivemultiplication factor of SFP remains unchanged and it should be less than 0.95 from the 95% probabilityand the 95% confidence level. However, the new guideline is including the new evaluation methodologieslike the application of the axial burnup profile, the validation of depletion and criticality code, and trendanalysis. Among the new evaluation methodologies, the most important factor that affects Keff is the axialburnup profile of spent fuel. US NRC recommends to consider the axial burnup profiles presented inNUREG-6801 in criticality analysis. In this paper, criticality effect was evaluated considering three profiles,respectively: i) Axial burnup profiles presented in NUREG-6801. ii) Representative PWR axialburnup profile. iii) Uniform axial burnup profile. As the result, the case applying the axial burnup profilespresented in NUREG-6801 showed the highest Keff among three cases. Therefore, we need to introduce anew methodology because it can be issued if the axial burnup profiles presented in NUREG/CR-6801 areapplied to the domestic nuclear power plants without any other consideration
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