ICONE19-43633 DEVELOPMENT AND THERMALHYDRAULIC CALCULATIONS OF A SCWR 64-ELEMENT FUEL BUNDLE

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The objective of this paper is to design a new fuel bundle for use in a generic pressure-channel SCWR, so that the fuel channel materials, i.e. sheath and fuel, will operate below accepted temperature limits. This was achieved by modifying the flow geometry of a 43-element fuel bundle by increasing the number of fuel elements and decreasing their outer diameter. Throughout this paper, the use of uranium mononitride as a possible fuel will be compared to that of uranium dioxide. Two fuel bundle designs will be compared to the reference 43-element Variant-20 bundle. These designs are a 64-element fuel bundle and a 54-element fuel bundle. The 64-element bundle consists of 63 fuel elements with an outer diameter of 9.1 mm, and a central element with an outer diameter of 20 mm, which is filled with burnable poison. The 54-element bundle consists of 53 fuel elements with an outer diameter of 9.5 mm, and a central element with an outer diameter of 20 mm, which is filled with burnable poison.

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