Research on Optimization Scheme of Thermal Power Filtering for Primary Loop of Nuclear Power Plant

Aiming to address the unplanned load reduction caused by fluctuation in the thermal power display value of the primary circuit of the M310 unit, a sensitivity analysis of the thermal power calculation parameters was conducted. By comparing steady-state operation data from different characteristic stages in the refueling cycle, it was found that the main factor influencing thermal power fluctuation is the temperature of the primary circuit hot section. Due to the fuel loading scheme and refueling scheme of the unit, the coolant of the hot section is not uniformly mixed, leading to significant temperature fluctuation in the primary circuit hot section. A new thermal power filtering scheme is proposed for this phenomenon, and it is verified by steady-state and transient operation data that the thermal power fluctuation range can be reduced while ensuring the transient response capability.