Design and test of flap valve of natural circulation in CARR

The flap valve of natural circulation was designed for the passive residual heat removal system of CARR (Chinese Advanced Research Reactor). Considering the functional requirements and performance parameters, the structure of two rotation assembly assemblies, i.e. the damping arm and a heavy weight part was adopted in the design to achieve the passive opening or closing motion of the flap valve. The function and the structure of the flap valve were described in this paper. The design calculation and the material selection and the performance test were also introduced. The performance test results showed that the flap valve can meet the design requirements. (authors)