Fuel rod cladding RIA simulation test device, fuel cladding tube internal pressure test device, fuel cladding tube internal pressure temperature test device, RIA simulation test device.

Reactivity Initiated Accident simulation test is to simulate nuclear reactor RIA accident conditions of the nuclear reactor, generally caused by rapid increase in reactivity, such as the elastic rod, the control rod assembly out of control and so on. The specific performance is that the internal pressure of the fuel rod and the surface temperature of the cladding are rapidly increased, which eventually causes the cladding tube to soften, expand, foam and burst.

Simulated RIA test device is used to simulate the simultaneous sharp rise of pressure and temperature in fuel cladding tube. The sample tube starts at the normal temperature and pressure conditions (or specified temperature and pressure conditions), and then simultaneously raises the internal pressure and the surface temperature of the sample tube at a set rate until the sample tube is destroyed, test is end.

At present, zirconium alloy is used in nuclear fuel cladding, zirconium alloy has good corrosion resistance, moderate mechanical properties and low thermal neutron absorption cross section (Zirconium is 0.18 barn) in high temperature and high pressure water and steam at 300-400 °C, has good compatibility with nuclear fuel, so it can be used as core structural material of water-cooled nuclear reactor (fuel cladding, pressure tube, support and channel tube). But in the case of serious loss of cooling accident, when the temperature of the material and the surrounding temperature rises above 800 °C, zirconium-water reaction between zirconium alloy and water vapor, which generates hydrogen gas, hydrogen gathers to a certain concentration, if it cannot be released or decompressed, explosion may occurs, such as the explosion in the nuclear accident in Fukushima, Japan.