Test system and method for heat transfer performance of diversified hot-well system in nuclear power plant

The invention discloses a test system for heat transfer performance of a diversified hot-well system in a nuclear power plant. The test system for heat the transfer performance of the diversified hot-well system in the nuclear power plant comprises a reactor coolant circulation loop and a heat derived circulation loop, the reactor coolant circulation loop comprises: a reactor coolant main pump communicating with the reactor coolant circulation loop and a hot side of a waste heat discharge system communicating with the reactor coolant recirculation loop; the heat derived circulation loop comprises a cooler of the reactor coolant main pump, a cold side of the waste heat discharge system, a conventional cold chain hot-well system, and a diversified hot-well system, wherein the conventional cold chain hot-well system is communicated with the cooler of the reactor coolant main pump and the cold side of the waste heat discharge system, and the diversified hot-well system communicates with the cold side of the waste