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| Dose rate assessment for pipeline purge of DGT |
| WU Haokun, CHEN Ling, LUO Zhiping, BI Yuanjie, GUO Jinsen
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| China Institute Atomic Energy, Radiation Safety Department, Beijing 102413 China |
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Abstract Objective To evaluate the residual dust in the pipeline under different conditions after the operation of DGT device and after cleaning and purging, to give the result of dose rate, and to propose radiation protection suggestions for the subsequent design of DGT.Methods The Rock'n'Roll resuspension model was used to evaluate the process of pipeline cleaning and purging. Finally, the pipeline dose was estimated in combination with the radioactive activity of dust using Microshield.Results Argon purge has the highest dust removal rate, which can remove about 30% of the dust. However, the dust removal rate is still not good when the particle size is small, and the dose rate caused by pipeline dust can reach a low level at the operating distance of 50 cm.Conclusion Purging can remove the dust adhered to the pipe wall to a certain extent, but it cannot be used as the main method to remove the dust adhered to the pipe wall.
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Received: 19 February 2020
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