<p>The floating reactor system will be rolling, heaving and other movements affected by waves, wind, etc. These movements will introduce additional inertial force field into the rod bundle, which will affect the flow characteristics in the rod bundle channel. In order to study the influence of rolling motion on the flow characteristics of rod bundle, a visualization research of the flow field of rod bundle channel with a pitch-to-diameter ratio of 1.326 was carried out under rolling motion. The results show that the rolling motion has a significant influence on the flow field in the rod bundle under the small drive force, which affects the velocity distribution in different sub-channels, and there is transverse mixing between adjacent sub-channels. With the increase of the drive force, the influence of rolling motion on the rod bundle flow field gradually weakens. The distribution of the flow field under rolling motion is significantly different from that under pulsating flow. The experimental results show that the rolling motion has less influence on the central part of the beam channel and more influence on the corner channel. The velocity field of the corner channel on both sides presents periodic fluctuation, and the wave phase is inverse phase. This study shows that the flow field variation caused by swaying motion is different from that caused by pulsating flow, and the flow field of fuel assembly in floating reactor system under ocean condition is further studied.</p>

Experimental Study on the Flow Characteristics of Rod Bundle Under Rolling Motion

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

2021 28th International Conference on Nuclear Engineering (ICONE28)

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