| 谢卫平,邸明乐,赵喜寰,陈皞,陈全利.核电厂换料大修一回路放射性核素调查和应用研究[J].中华放射医学与防护杂志,2022,42(8):641-644 |
| 核电厂换料大修一回路放射性核素调查和应用研究 |
| Investigation on radionuclide deposition during primary loop overhaul at a nuclear power plant |
| 投稿时间：2022-03-01 |
| DOI：10.3760/cma.j.cn112271-20220301-00070 |
| 中文关键词: 核电厂 剂量率 大修 放射性核素 |
| 英文关键词:Nuclear power plants Dose rates Overhauls Radionuclides |
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| 中文摘要: |
| 目的 调查某核电厂大修换料期间一回路相关系统的放射性核素资料。方法 采用中低辐射场高纯锗（HPGe）就地γ源项测量系统、强辐射场碲锌镉（CZT）就地γ源项测量系统和便携式辐射监测仪Radiagem-2000测量主管道系统、一回路冷却剂净化系统、容积和硼控系统、余热导出系统、含硼水系统管道内壁沉积的放射性核素。结果 由放射性核素调查结果可知，该核电厂一回路相关系统的放射性核素主要有58Co、60Co、95Nb、95Zr、51Cr、124Sb、54Mn、110Ag*、59Fe，沉积量较多的放射性核素为60Co、58Co、124Sb、95Zr，其中60Co在安全阀下方粗管内的沉积量最大为21 200 Bq/cm2，58Co在主管道满水状态下热段管道内的沉积量最大为8 480 Bq/cm2，124Sb在一回路净化系统过滤器前管道内、化容下泄管道内的沉积量最大分别为4 910、4 680 Bq/cm2，95Zr在主管道满水状态下热段管道内的沉积量最大为2 500 Bq/cm2，同时发现净化系统过滤器后、含硼水泵上游管道内沉积的放射性核素明显少于其它系统。结论 该核电厂一回路相关系统内放射性核素的种类基本是一致的，但是放射性核素沉积的量却存在较大差异，应重视通过净化系统过滤器去除一回路放射性核素。 |
| 英文摘要: |
| 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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