Iodine vapor generation and on-line detection recovery system for mandrel test

Abstract

The invention discloses an iodine vapor generation and online detection and recovery system for a mandrel test. Iodine particles are placed in an oval-shaped cavity with a negative angle groove, and the cavity is placed in a constant temperature water tank with a preset temperature, and the iodine particles sublimate into iodine vapor; the iodine vapor is passed into a fluidity cuvette through argon, and a tungsten light source penetrates through the fluidity cuvette and the absorbance of the iodine vapor is measured through a spectro-photometer; and after the iodine vapor flows through a furnace body, a sodium sulfite solution is led to absorb the iodine vapor, and finally whether the recovery is complete or not is determined by an ethanol solution. According to the iodine vapor generation and online detection and recovery system, the equilibrium state of iodine sublimation and desublimation can be changed by setting the temperature of the water tank, the absorbance of the iodine vapor is measured online to calculate the current working condition concentration, the sodium sulfite solution is used for absorbing the iodine vapor, and the ethanol solution is used for checking whetherthe recovery of the iodine vapor is complete or not. The iodine vapor generation and online detection and recovery system is simple and safe to operate, is used in working conditions that require iodine vapor corrosion in the mandrel test, and achieves efficient and safe treatment of iodine waste gas.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel and material mechanical performance testing, and in particular relates to an iodine vapor generation and on-line detection and recovery system for mandrel tests. Background technique [0002] The fuel element is the core component of the nuclear fission source in the reactor. Therefore, the element cladding containing the fuel core and fission products has extremely high performance requirements. The external mechanical performance test is indispensable for the design of the nuclear fuel element of the reactor. [0003] Reactor Fuel Pellets are UO 2 , producing fission gas I in a nuclear reaction 2 , iodine vapor is corrosive and acts on the inner surface of the cladding. With the increase of burnup, the fission gas produced by fissile nuclides increases, and due to the effect of temperature gradient in the pellet, the diffusion and migration occur, resulting in the radiation swelling of th...

AI Technical Summary

Problems solved by technology

When the test air flow is large, iodine particles are easily taken by the inlet gas to block the gas outlet, and the concentration of iodine cannot be accurately measured in real time

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