Uranium hexafluoride online monitoring method

Abstract

The invention belongs to monitoring methods and particularly relates to a uranium hexafluoride online monitoring method, which comprises the following steps of: 1, weighing; 2, flow calculation; and 3, comparison with a standard value: and comparing the flow obtained through calculation in the step 2 with standard flow, judging that an accident exists if the flow obtained through calculation in the step 2 and the standard value have larger deviation, or else, executing the step 1, namely weighing. The uranium hexafluoride online monitoring method disclosed by the invention has the obvious effects that the flow of uranium hexafluoride entering a reburner is determined by measuring the changes of the weight of a uranium hexafluoride container, so that a monitoring container cannot be corroded; in addition, the monitoring method can be used for monitoring the average flow in a period of time, so that a false alarm caused by instant high flow rate and instant low flow rate is avoided.

Description

technical field [0001] The invention belongs to a monitoring method, in particular to an online monitoring method for uranium hexafluoride. Background technique [0002] UF6 is the raw material for the production of UO2, which can be further used to make fuel assemblies. The production process from uranium hexafluoride to uranium dioxide is generally completed by a reformer. Gaseous uranium hexafluoride is continuously fed into the reformer as a raw material, and the produced uranium dioxide is continuously taken out of the reformer. Uranium hexafluoride itself has strong corrosiveness, and its molecular weight is relatively large (352), which is a non-ideal gas, and it is easy to crystallize and cause blockage. In addition, if the speed of UF6 entering the reformer is lower than the set speed, it will cause material accumulation in the furnace, and in severe cases, it will lead to critical hidden dangers. [0003] In order to avoid the occurrence of the above situation, ...

AI Technical Summary

Problems solved by technology

Uranium hexafluoride itself is highly corrosive, and its molecular weight is relatively large (352), it is a non-ideal gas, and it is easy to crystallize and cause blockage

However, as mentioned above, UF6 is highly corrosive and will corrode the detection head of the monitor. The corroded detection head cannot detect accurate flow data, and the property of easy crystallization will make UF6 crystallization in the head

Therefore, it is difficult to completely guarantee the accurate measurement of its real flow

In addition, the flow sensor detects the instantaneous flow rate. If for some reason the flow rate of the material entering the furnace produces a short-term large flow rate or a small flow rate, the sensor will also consider it a safety hazard and alarm, but the above-mentioned short-term large flow rate or small flow rate The feeding of materials into the furnace will not affect the production. Only when the flow into the furnace continues to be overloaded with a large flow rate or a long-term low flow rate may cause safety hazards

[0004] If uranium hexafluoride leaks between the detector and the feed inlet of the reformer, the detector cannot detect it. In addition, the uranium material in the reformer leaks from the filter tube to the exhaust system and cannot be found immediately.

The leakage of uranium hexafluoride and the leakage of uranium materials into the exhaust system are major nuclear safety hazards

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