| Xie Weiping,Di Mingle,Zhao Xihuan,Chen Hao,Chen Quanli.Investigation on radionuclide deposition during primary loop overhaul at a nuclear power plant[J].Chinese Journal of Radiological Medicine and Protection,2022,42(8):641-644 |
| Investigation on radionuclide deposition during primary loop overhaul at a nuclear power plant |
| Received:March 01, 2022 |
| DOI：10.3760/cma.j.cn112271-20220301-00070 |
| KeyWords:Nuclear power plants Dose rates Overhauls Radionuclides |
| FundProject: |
| Author Name | Affiliation | | Xie Weiping | Jiangsu Nuclear Power Corporation, Lianyungang 222000, China | | Di Mingle | Jiangsu Nuclear Power Corporation, Lianyungang 222000, China | | Zhao Xihuan | Jiangsu Nuclear Power Corporation, Lianyungang 222000, China | | Chen Hao | Jiangsu Nuclear Power Corporation, Lianyungang 222000, China | | Chen Quanli | Jiangsu Nuclear Power Corporation, Lianyungang 222000, China |
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| Abstract:: |
| Objective To investigate radionuclide deposition in the systems related to the primary loop during the overhaul and refueling at a nuclear power plant.Methods The radionuclides deposited in the main piping system, the primary loop coolant purification system, the volume and boron control system, the waste heat export system, and the inner wall of pipe in boron-containing water system were measured by using the low and medium radiation field high-purity germanium (HPGe) in-situ γ source term measurement system, the strong radiation field cadmium zinc telluride (CZT) in-situ γ source term measurement system, and the portable radiation monitoring instrument Radiagem-2000.Results The result had shown that the major radionuclides deposited in the systems related to primary loop were mainly 58Co, 60Co, 95Nb, 95Zr, 51Cr, 124Sb, 54Mn, 110Ag*, 59Fe, and those with higher deposition were 60Co, 58Co, 124Sb, 95Zr. Of them, the largest deposition was 60Co up to 21 200 Bq/cm2 in extra strong pipe below the safety valve, 58Co up to 8 480 Bq/cm2 in the pipeline of hot section in the state of full water in the main pipeline. 124Sb was 4 910 Bq/cm2 in pipeline before the filter of the primary loop purification system and 4 680 Bq/cm2 in the chemical capacity drainage pipeline, respectively, and 95 Zr was 2 500 Bq/cm2 in the pipeline of hot section in the state of full water in the main pipeline. The radionuclides deposited, after the filter of the purification system, in the pipe upstream of the boron-containing pump were significantly lower than those in other systems.Conclusions The types of radionuclides in the systems associated with primary loop at a nuclear power plant are basically identical, but their amount deposited varies greatly. Attention should be paid to the removal of radionuclides in primary loop through the filter of purification system. |
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