Ajoy Debbarma ¹, Krishna Murari Pandey ¹

Affiliations
1 Department of Mechanical, National Institute of Technology Silchar, Silchar - 788010, Assam, IN

Abstract

Rewetting is the process of re-establishment of coolant contact with hot surfaces. The present numerical analysis of rewetting nuclear fuel rod are conducted with a proposed zigzag jet direction model in AHWR. Further analysis studied with various jet diameters; 2mm, 3mm and 4mm. The computational domain for simulation; single sector of AHWR, with a vertical section of 542 mm. The domain has 9 fuel rods arranged in three concentric ring. This work has carried out in ANSYS CFX 14.0 packages, with transient two-phase flow. The turbulences validation exercise found SST model, with fairly prediction of experimental data. The wall temperature profile shows irregular and uneven across the surface. The wetting delay at any inlet section is negligible and it got increases in the position away from the inlet section. The wall temperature increases in the section where void sustainability is longer, it is observed with small jet diameter. Overall, the zigzag jet direction has a very responsive information compared to existing model. The present result also evicted that increased in jet diameter, the rewetting temperature and wetting delay reduce significantly.

Keywords

Advanced Heavy Water Reactor, Rewetting Temperature, Shear Stress Turbulence, Wetting Delay, Zig-Zag Jet Impingement

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