【作者】 戚雄飞； 李松发； 刘鹏； 蔡文超； 白宏博； 孙彪；

【Author】 QI Xiong-fei;LI Song-fa;LIU Peng;CAI Wen-chao;BAI Hong-bo;SUN Biao;Nuclear Power Institute of China;

【机构】 中国核动力研究设计院；

【摘要】 高通量工程实验堆(HFETR)在低浓铀(LEU)燃料元件装载运行期间,一次水活度浓度较高。为了降低HFETR一次水活度浓度,提高燃料元件的抗腐蚀性能,采取了改进燃料元件铝合金包壳表面预处理工艺的措施。本文选取阳极氧化预处理元件全装载和采用阳极氧化、水煮预处理工艺元件混装载以及水煮预处理元件全装载三个连续运行阶段,对HFETR的一次水活度浓度、裂变及活化核素活度浓度进行了总结分析。结果表明,HFETR的LEU燃料元件铝合金包壳采用水煮预处理替代阳极氧化预处理工艺的过程中,一次水活度浓度、典型核素活度浓度保持稳定降低趋势,HFETR一回路运行水质状况得到明显改善。通过对HFETR改进燃料元件包壳预处理工艺的运行反馈分析,证明了在优化运行水质方面,研究堆用铝合金包壳采用水煮预处理工艺比阳极氧化预处理更有优势,为我国研究堆LEU燃料元件的研究和生产提供了运行经验反馈。更多还原

【Abstract】 By During the operation of the Low-Enriched Uranium(LEU) fuel element of the High Flux Engineering Test Reactor(HFETR), the primary water activity concentration is relatively high. In order to reduce the HFETR primary water activity concentration and improve the corrosion resistance of the components, measures have been taken to improve the surface pretreatment process of the aluminum ally cladding of fuel element. This paper selects the three continuous operation stages of full loading of anodizing components, mixed loading of anodizing, hydroxide process components, and full loading of hydroxide pretreatment components. The primary water activity concentration, fission and activated nuclide activity concentration of HFETR are summarized and analyzed. The results showed that the primary water activity concentration and the typical nuclide activity concentration maintained a steady decreasing trend when the aluminum alloy cladding of HFETR LEU fuel element adopts hydroxide pretreatment instead of the anodizing pretreatment process, and the water quality of the HFETR primary circuit has been improved significantly. Through the operational feedback analysis of the HFETR improved fuel element cladding pretreatment process, it is proved that in terms of optimizing the operating water quality, the hydroxide pretreatment process for the aluminum alloy cladding for research reactors has more advantages than the anodizing pretreatment process, which provides operational experience feedback for the research and production of LEU fuel elements for research reactor in China.更多还原