Abstract-Nuclear Power Plants are a complex system and need to be controlled very meticu lously to avoid any catastrophe from occurring. The safety and availability of the power p lant relies on the human operators both through their ability and reliab ility to ensure smooth and trouble-free plant operations. Train ing the operators on normal p lant operation, maintenance, fault d iagnosis and unforeseen emergencies in the p lant helps reduce the latency period of the plant and thus increase the efficiency. Operator Train ing Simulator has become an indispensable entity in impart ing hands on training to these operators. Develop ment of process simulators calls fo r the p rocess to be designed, modeled and imp lemented to replicate the real plant in steady state and transient conditions.