A secondary-side passive residual heat discharge system for a nuclear power plant steam generator

摘要

A secondary-side passive residual heat discharge system for a nuclear power plant steam generator, comprising a cooling water tank (3) filled with water and disposed on the periphery of a reactor containment casing (11), a heat exchanger (2) immersed at the bottom of the cooling water tank, a first residual heat discharge pipeline (12) having one end extend out through the containment casing and connect to the inlet of the heat exchanger, a steam pipeline isolation valve (5) disposed on the first residual heat discharge pipeline, a second residual heat discharge pipeline (13) having one end extend out through the containment casing and connect to the outlet of the heat exchanger, and a first set of isolation valves (7) disposed on the second residual heat discharge pipeline; the other end of the first residual heat discharge pipeline is connected to a steam pipeline (9) at the upper end of the steam generator (1); the other end of the second residual heat discharge pipeline is connected to the water supply pipeline (10) of the steam generator. When the whole plant has a power outage and the power plant loses the ability to discharge the residual heat of the whole active reactor core, the system can utilize the density difference between the steam and water as a driving force to operate "passively" to discharge the reactor core residual heat for an extended length of time, thus keeping the reactor in a safe state.