<p style="text-align: justify">In order to meet the new challenges on the energy and environment, a new conceptual design of nuclear heating reactor (HAPPY200) is developed. HAPPY200 is a low-pressure closed loop reactor with high security, great efficiency and maturity, which is developed by State Power Investment Corporation (SPIC) independently. It can be used for heating, cooling, desalination and other applications. Based on large volume pool completely passive technologies, HAPPY200 safety system can provide an inherent technical guarantee for the safety of the reactor.The outlet temperature is 120℃, the inlet temperature is 80℃, the operating pressure is 0.6MPa. In this study, the thermal&nbsp;performance problems of big or small fuel assemblies are discussed for HAPPY200. At present, the commonly used PWR fuel assembly is in the form of a 17x17 square arrangement assembly. Considering the advantages of easy layout and refueling of small assembly, the 9x9 small fuel assembly is also considering. For the HAPPY200 reactor core conceptual design, 37group 17x17 big assemblies which include 9768 fuel rods can be arranged. And for the same size of PRV, 157group 9x9 small assemblies which include 11304 fuel rods can be arranged. Based on the&nbsp;analysis results, in the condition of same total power, the thermal performance of HAPPY200 with small assembly is better; and in the condition of same rod power, the case2 with small assembly have better thermal performance and have higher total power.</p>

Comparison on HAPPY200 Reactor With Different Type Fuel Assembly

Paper Proceedings: https://asmedigitalcollection.asme.org/ICONE/ICONE28/volume/85246

2021 28th International Conference on Nuclear Engineering (ICONE28)

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