Most of the studies focusing at power plant construction cost, power plant O&M cost, and power plant decommissioning cost particularly, a primary objective is to consider all major power plant costs. Usually, minuscule costs and sometimes major cost factors are also not the issue of discussion. There are many elementary factors which determine the economics of nuclear power generation methods and that various assumptions can be made concerning. In this matter, it refers to the power generation costs of nuclear power plants and other arguments from other aspects can be summarized in terms of power generation costs. Therefore, this work focuses on electricity costs for nuclear power plants particularly Light Water Reactor (LWR) technology. Main feature of this research is to consider all cost components of reprocessing plant apart from main nuclear power plant costs i.e., construction cost, O&M cost, and decommissioning cost of reprocessing plant. This work is being carried out for the cost approximation of electricity for LWR technology, with consideration of tariff based and LCOE based methodologies for Once Through Cycle (OTC) and Twice Through Cycle (TTC).