Primary loop pressure relief system and primary loop overpressure protection system

The utility model discloses a primary loop pressure relief system and a primary loop overpressure protection system. The primary loop pressure relief system comprises a hot state pressure relief unit and a cold state and active pressure relief unit, wherein the hot state pressure relief unit is used for carrying out hot state overpressure automatic pressure relief on a primary loop; the cold state and active pressure relief unit is used for carrying out cold state overpressure automatic pressure relief and active pressure relief on the primary loop; wherein the hot-state pressure relief unit comprises at least two spring safety valves with different opening fixed values; one end of each spring type safety valve is connected to the pressure stabilizer through a pressure relief pipeline, and the other end of each spring type safety valve is connected to the pressure relief recovery system through a discharge pipeline; one end of the cold state and active pressure relief unit is connected to the voltage stabiliz