How to establish natural circulation of liquid metal coolant in fast neutron reactors

摘要

The present invention relates to the field of nuclear engineering and can be used to establish a natural circulation of liquid metal coolants in heat removal circuits of fast neutron reactors. An ascending tube of the heat removal circuit to create circulating power without the use of a pumping device and to ensure the required direction of natural circulation of the liquid metal coolant in the heat removal circuit without heat transfer from the fast neutron reactor. And before filling the descent tube and equipment, preheat them to a temperature selected from the following inequality conditions, T ₁ and T ₂ , respectively: [Number 3] However: ρ ₁ (T ₁ ) − Density of liquid metal coolant at temperature T ₁ of riser pipe and equipment; ρ ₂ (T ₂ ) − Density of liquid metal coolant at temperature T ₂ of descent pipe and equipment; ΔH ₁ − Height difference between rising entrance and exit; ΔH _2- Difference in height difference between entrance and exit; Hydraulic resistance of ΔP- circuit; g-Gravitational acceleration. The coolant circulation in the circuit is started at the same time as the shift to the natural circulation mode, and the circulation force due to the difference between the liquid metal coolant densities ρ ₁ (T ₁ ) and ρ ₂ (T ₂ ) of the ascending pipe and the descending pipe, respectively. It is carried out until the reactor reaches the rated operating parameters by the method of making.