PROBLEM 3

Problem 7.9. The fuel rods in an experimental nuclear reactor are arranged in a rectangular pattern, as shown in the Fig.

P7.9. The fuel rod diameter is 1.14 cm, and the pitch is Pitch=1.65 cm. The rod bundle is 3.66 m tall. Assume that

the core operates at 6.9 MPa, and the water temperature at inlet is 544 K. Heat flux on the fuel rod surface is uniform

and equal to 6.31×10¹ W/m². The flow is assumed to be 1-D, and the mass flow rate through a unit cell is 0.15 kg/s.

Estimate the fuel rod surface temperature at x = 10 cm, x= 25 cm, and x = 50 cm locations.

Flow

-||

- Channel

Fuel Rods

Pitch