The accurate and rapid execution of procedural tasks in the main control room of a nuclear power plant (NPP) is essential for safe plant operations. This study explored the impact of different types of procedural tasks on operational control performance through simulation experiments. Using a typical Emergency Operating Procedure (EOP) from the control room as an example, we abstracted the procedural tasks into five types and designed human-machine interfaces (HMI) to conduct simulation experiments. Data were collected and analyzed from three aspects: task performance, behavioral performance, and operator state, to assess participants' operational control performance in completing different tasks. The experimental results indicated significant differences in the impact of task types on operators' operational control performance. The results of this research can provide support for improving operational safety in the control room through refined task classification and quantitative assessments of operational control performance.