There are a total of 74 fuel rods and 2 water rods in the 9x9 cross-section. Table A-1 gives other values used to describe the geometry for the purposes of determining the loss coefficients. The left column in Table A-1 gives a convenient Identification for each value. Table A-1 . Figure A-3 shows a fuel bundle in a rack cell from the side.
Viscous loss is accounted for along the tubes and side wall.
The inertial losses are accounted for at the lower base hole, the lower and upper tie plates, and the seven grid spacers. Each of these losses is discussed below. The viscous losses come primarily from flow along the tubes. It is assumed that viscous losses are uniform for the entire length of the racks. These losses are based on correlations for tube flow.