This work investigates the possibility of increasing the incineration rate of reactor-grade plutonium (rgPu) in the pressurized water reactor (PWR). In an attempt to reduce the production of plutonium isotopes from the conventional fuel and increase the rate of burning the accumulated plutonium, thorium-232 is suggested to be used as a fertile material in the standard fuel assembly and a suggested Blanket-seed assembly. The neutronic properties of Th-rgPu in both the standard fuel assembly and the BS assembly were analyzed and compared with the standard fuel to distinguish which of them is more effective in burning the rgPu. The performance of Th-rgPu in the standard fuel assembly and the BS assembly has been assessed by tracking the infinity multiplication factor (Kinf), the amount of the rgPu incinerated, reactor safety parameters, the most important fission products, the radioactivity of the spent fuel and the radial power distribution through the assembly. The neutronic analysis confirmed the viability of BS assembly in burning a large quantity of rgPu, maintaining the neutronic safety parameters at acceptable values.