Passive residual heat removal system outside lead-based fast reactor

The utility model provides a passive residual heat removal system outside a lead-based fast reactor. The passive residual heat removal system outside the lead-based fast reactor comprises a cooling water tank filled with cooling water, a steam pipeline, a cooling water pipeline and a heat transfer pipe, the first end of the cooling water pipeline is communicated with the cooling water tank, and the second end is communicated with the first end of the heat transfer pipe; the first end of the steam pipeline communicates with the cooling water tank, and the second end of the steam pipeline communicates with the second end of the heat transfer pipe; a steam isolation valve is arranged on the steam pipeline, and a cooling water isolation valve is arranged on the cooling water pipeline; the heattransfer pipe comprises an ascending pipeline and a descending pipeline connected with one end of the ascending pipeline, and a heat preservation layer is arranged between the ascending pipeline andthe descending pipeline. T