Abstract
This paper presents effective multiplication factor (keff)
 with different burnable absorbers and weight percentages at different
 temperatures as well as doppler coefficient results and number density
 calculations for Westinghouse type pressurized water reactor (PWR) Assembly.
 Integral fuel burnable absorber rods coated with ZrB2 and
 Gadolinia-Uranium (UO2-Gd2O3) integral
 burnable absorbers were considered to calculate reactor parameters (keff
 and doppler coefficient). The results compared with base fuel which
 does not contain burnable absorber at different temperatures. The results show
 that reactivity was decreased with increased temperature and doppler
 coefficients increased with temperatures but remained negative at all
 temperatures. At 1500 K, the effective multiplication factor for base fuel was
 found to be 1.46985 while the effective multiplication factors for 2% with Gd2O3,
 8% with Gd2O3, and IFBA rods were 1.38976,  1.37574, and 1.30337 respectively.
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