Neutron noise monitoring of inocre vibrations on China's high flux engineering test reactor

Abstract The paper covers the measurement system, experimental results and identification of the driving sources for the neutron noise of the in-core vibrations. From 1980 to 1982, during three fuel cycles, the long-term monitoring of the core and its component vibrations was performed on China's High Flux Engineering Test Reactor, which is a pressurized water moderated/cooled and beryllium reflected reactor having a variety of functions. Tt was the first reactor of such type in China, and came into operation at the end of 1980. The experimental results show that the reactor core, including fuel assemblies and control rods, is stable enough even though it has no upper grid plate and is lashed by coolant flow with velocity of 10 m/sec.