Nuclear power units have the ability to provide large-scale, stable industrial steam. With the rising prices of fossil fuels, nuclear energy has become economically competitive in supplying industrial steam. Laboratory measurements show that, under the condition of no leakage in the heat transfer tube of the steam generator, the concentration of radionuclides in the condensed water of the secondary loop steam is not different from that in the environmental water sample except for tritium. The IAEA technical report provides a two-cycle scheme of PWR supply steam for SAGD, which has the advantages of simple system, less process equipment, and high steam quality compared to the external steam supply scheme from the tertiary loop. Based on the drinking water standard, this article proposes to control the target value of radionuclide management for industrial application of secondary loop steam at 3.0 Bq/kg; Add a high- sensitivity radiation monitor on the steam generator blowdown line, and carry out technical renovation on the main steam pipeline N- 16 radiation monitoring channel to provide timely, effective, and reliable monitoring of steam generator heat transfer tube leakage. It is interlocked with the control valve at the boundary of the external steam supply pipeline factory area to prevent radionuclides from passing through the steam supply pipeline factory area during operation and accident conditions.
A three-dimensional numerical simulation model for salt water cooling tower was established to study the characteristics of drifts and salt deposition in nuclear power project.In the model,site meteorological data,design parameters of cooling tower,general layout and environmental characteristics are considered.The results show that when the natural wind direction is parallel to the tower row,two hot air streams are superimposed on each other as one,which is beneficial to reducing the influence of drifts and salt deposition in the environment.The drifts with particle size greater than 550 μm can not escape from the outlet of cooling towers.For normal operation of 2 nuclear power units at the same site,the salt deposition will not cause damage to plants.
为使室内氡暴露剂量评估更加具有系统性和普遍适用性,利用矩阵构建了一种建材所致室内氡暴露剂量的评价方法.该方法基于室内氡浓度模型、人员暴露剂量估算模型及相应标准,同时考虑建材氡析出率、房屋结构尺寸、室内换气率以及人员暴露时长等因素,将不同情况下的复杂计算转化为矩阵,最终得到在不同换气率和不同暴露时长情况下的室内人员氡暴露剂量等级.以一处已知房屋尺寸和各建材氡析出率的居室为例,使用本方法对其室内氡暴露剂量进行了分析和评估,以查表的方式快速得到了不同换气率和暴露时长下室内氡暴露剂量等级.
外周血淋巴细胞染色体畸变和微核作为对电离辐射较为敏感的生物指标,在国内外辐射生物剂量估算中得到广泛应用和认可,但在放射工作人员职业健康监护中的价值尚有值得讨论的问题.本文从染色体畸变和微核形成机制入手,探讨这 2 项细胞遗传指标在放射工作人员职业健康检查中的意义和实用价值,供同行讨论和参考.
瞄准先进的局部放射损伤的基础研究及临床诊疗技术的国际前沿,结合国内尤其是核工业总医院 30 余年从事放射损伤基础研究和临床救治的实践经验,从多个维度建立铱-192 源外照射致局部放射损伤的精准评估技术体系,建立局部放射损伤优化的救治策略和疗效估评方案,并在局部放射损伤的诊疗全过程中加以验证,从而实现对铱-192 源外照射致局部放射损伤的精准评估、规范救治、预后判断、康复管理和长期医学随访,提高局部放射损伤的治愈率,降低致残率,为局部放射损伤的诊疗提供理论指导和技术支撑.
