On Void Reactivity Limitation for the Core Loaded with Mixed Nitride Fuels
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概要
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Self-controllability and self-terminability are strongly required as passive safety features in future liquid-metal FBR (LMFBR) commercialization. In this study, the self-terminability of the MN-fueled core was focused on. The FBR cores including the MN-fueled core should be designed to eliminate severe recriticality leading to energetics during core disruptive accidents (CDAs) because the cores are not designed to operate in an optimum configuration from a reactivity point of view. In addition, in the case of the MN-fueled core, the nitrogen gas N2 generated by the thermal dissociation, one of the unique phenomena of the nitride fuel, would give another cause of reactor vessel failure. Such a mechanical effect would strongly depend on the magnitude of the void reactivity. In this study, the allowable maximum void reactivity of the MN-fueled core to maintain the mechanical integrity of the reactor vessel was evaluated against an Unprotected Loss-of-Flow (ULOF) accident by using ARGO taking into account the equation-of-state of the MN fuel. By considering the partial-pressure-dependent thermal dissociation process, the design limit of the core void reactivity (positive sum) was estimated to be 6.2 $.
- 2009-10-01
著者
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Endo Hiroshi
Nuclear Energy System Safety Div., Japan Nuclear Energy Safety Organization (JNES)
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ISHIZU Tomoko
Department of Nuclear Engineering, Tokyo Institute of Technology
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NINOKATA Hisashi
Department of Nuclear Engineering, Tokyo Institute of Technology
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Ishizu Tomoko
Research Laboratory For Nuclear Reactors Tokyo Institute Of Technology
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Ishizu Tomoko
Department Of Nuclear Engineering Tokyo Institute Of Technology
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Ninokata Hisashi
Tokyo Inst. Of Technol.
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Ninokata Hisashi
Res. Lab. For Nuclear Reactors Tokyo Inst. Of Technol.
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Endo Hiroshi
Nuclear Energy System Safety Div. Japan Nuclear Energy Safety Organization (jnes)
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Ninokata Hisashi
Department Of Nuclear Engineering Tokyo Institute Of Technology
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ISHIZU Tomoko
Department of Nephrology and Endocrinology, University Hospital, The University of Tokyo
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Ishizu Tomoko
Department of Cardiology, Mito Kyodo General Hospital
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