Porous body model for predicting temperature distributions in wire wrapped fuel and blanket assemblies of a LMFBR

Prediction of the coolant temperature field in a breeder reactor including interassembly heat transfer

“…The first axial point shall be 0.0 and the last axial point shall be 1.0. The formats [1][2][3][4][5] for these cards are 8F10.5. Section III.…”

“…On the next page, it will print out the average [1][2][3][4][5][6][7] i. Sperature inside the. duct, the total heat generation of the assembly, the enthalpy increase inside the duct, and the enthalpy increase in the gap of the assembly, It 07-inf;s out the radial temperature distribution of the assembly'.…”

“…Therefore it is desirable to understand and to know quantitatively how the inclusion of the interassembly heat transfer affects the temperature distribution. In studying this question in breeder reactors with wire wrapped fuel assemblies we adopt the methodology of the ENERGY Code [5] to analyze the performance of each subassembly. The physical model of simulating the cross flow caused by the wire wrap of the fuel.…”

“…pin by an effective eddy diffusitivity is employed. The velocities in the interior region and the wall region of an assembly are obtained from the uniform theoretical flow split velocities [5,61. These approximations enable the momentum equations to be decoupled from the energy equations.…”

“…In region IV, the differential equation is pcpv4 , VT = k72T (4) 14 where we have assumed that this is a laminar flow region, the boundary conditions for joining various regions are Tregion I = Tregion II I A VT · n = VT • n (5) region I region II…”