Boundary effect on the dynamic response of a 7-hexagon fuel ducts submerged in fluid

• Effects of boundary constraint for a 7-column core are investigated with a coupled acoustic structure model. • Weak and strong boundary constraints provide a bracketing limit for real-world situation. • Stronger coupling effect is more evident when gap size is smaller for the weak boundary constraint. Understanding the dynamic response of core structure in a fast reactor under earthquake could provide a guideline for the reactor design. A core...