TAILIEUCHUNG - Validation of UNF-ST&DARDS As-loaded safety analysis methods for BWR decay heat calculations

The assessment in this paper is necessary to demonstrate that sufficient decay heat conservatism is retained in the UNF-ST&DARDS bounding as-loaded spent fuel analysis methodology. This paper also demonstrates the time dependent impact of various parameters such as last cycle power on decay heat values. | Progress in Nuclear Energy 143 2022 104042 Contents lists available at ScienceDirect Progress in Nuclear Energy journal homepage locate pnucene Research Paper Validation of UNF-ST amp DARDS As-loaded safety analysis methods for BWR decay heat calculations Justin B. Clarity a Henrik Liljenfeldt b Kaushik Banerjee c L. Paul Miller a a Oak Ridge National Laboratory Nuclear Energy and Fuel Cycle Division Oak Ridge TN USA b Noemi Analytics Uppsala Sweden c Pacific Northwest National Laboratory Richland WA USA A R T I C L E I N F O A novel assessment of the conservatism in the UNF-ST amp DARDS decay heat calculations has been performed. Keywords UNF-ST amp DARDS is used to quantify the uncredited margin in safety analysis calculations for spent nuclear fuel Spent nuclear fuel SNF storage transportation and disposal systems. The goal of the assembly-specific as-loaded safety analysis UNF-ST amp DARDS approach in UNF-ST amp DARDS is to determine the time-dependent realistic state of the SNF systems however it is Decay heat desirable to conservatively estimate safety analysis parameters such as decay heat for a given set of fuel LWR characteristics. The primary source of conservatism in the generic UNF-ST amp DARDS assembly-specific as-loaded analysis also referred to as bounding within UNF-ST amp DARDS is the conservative assumptions of various reactor operational parameters that attempt to envelop wide spectrum of reactor operating scenarios. The assessment in this paper is necessary to demonstrate that sufficient decay heat conservatism is retained in the UNF-ST amp DARDS bounding as-loaded spent fuel analysis methodology. This paper also demonstrates the time dependent impact of various parameters such as last cycle power on decay heat values. A comparison between the UNF-ST amp DARDS bounding decay heat calculations and calculations performed using a detailed description of the fuel assembly operating histories referred to as detailed calculations was

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