Generation IV Nuclear Energy System Initiative. Air-Cooled Option RCCS Studies and NSTF Preparation.

摘要

The Reactor Cavity Cooling System (RCCS) is an important system to the passive safety case being incorporated in the overall safety strategy for the Next Generation Nuclear Plant (NGNP). The RCCS will be one of the new safety systems specifically designed for the next generation of nuclear power plants. In particular, it is being developed and incorporated into the proposed reactor and plant designs for the very high temperature reactor (VHTR)--a helium gascooled nuclear plant with a thermal-spectrum reactor. The RCCS forms a passive heat sink external to the reactor, and is located within the reactor cavity/silo surrounding the metal vessel. During emergency accident conditions when all ac (alternating current) power is lost, natural convection of the RCCS coolant removes the heat radiated or naturally convected from the metal vessel wall to the inner boundary of the RCCS facing the vessel. RCCS will be a first-of-a-kind (FOAK) passive safety system for core decay heat removal when the FOAK VHTR is built.