Study on Key Parameter Range for Curie Point Passive Shutdown Device Based on Integrated Fast Reactor

Passive shutdown procedures can be initiated by the Curie point passive shutdown device, which is a sophisticated reactor safety mechanism that augments the coolant temperature at the core outlet to ensure safety. With this innovative approach, unprotected accidents can be effectively addressed, ensuring the robustness and safety of integrated fast reactor. Enhancing the overall safety and operational stability of the reactor system is the primary objective of this device. To gain a clearer understanding of the pivotal parameters that influence the efficacy of the Curie point passive shutdown device in mitigating the consequences of unprotected accidents, a meticulous analysis of the power plant’s operational procedures was undertaken. The thorough examination covered multiple vital aspects, such as establishing the lower threshold for Curie temperature, evaluating response time, measuring fall time of control rods, and assessing the reactivity worth of the stop rod. In order to ensure timely and effective reactor shutdown, these parameters were essential in the non-dynamic shutdown process and played a crucial role. In this paper, a advanced computational fluid dynamics (CFD) software was used to ensured that unintentional rod ejection during routine reactor operations was avoided. By using this sophisticated tool, the temperature of temperature-sensitive alloys located in the core outlet region could accurately calculated, thereby determining the precise lower boundary for Curie temperature. Furthermore, an accident analysis program was employed to ascertain the maximum allowable response time required for rod dropping in the event of an unprotected accident, which in turn facilitated the establishment of a corresponding upper limit for Curie temperature. Following an exhaustive investigation, it was unequivocally confirmed that temperature-sensitive alloy materials exhibit favorable magnetic flux variations within the prescribed temperature range. This significant finding underscores the practical feasibility and dependability of the Curie point passive shutdown device when operated within its specified parameters. Consequently, the delineation of a reasonable range for these identified key parameters offers invaluable insights for subsequent iterations of equipment design. This ensures that Curie point passive shutdown devices remain compliant with the most stringent safety and performance benchmarks in fast reactor applications, thereby safeguarding the integrity and reliability of nuclear power systems.