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为中国10MW高温试验模块堆研制了球形燃料元件,它由包覆燃料颗粒弥散在石墨基体里的燃料区和由不含燃料的同样基体材料外壳组成,燃料区和无燃料区之间没有物理上的分界面。改进了燃料核芯的溶胶凝胶制备工艺,使之兼有内、外凝胶工艺的优点;包覆燃料颗粒采用TRISO结构,实验室产品的冷态性能与国际同类产品的相当,初步辐照结果良好;用化学提纯工艺制出了核纯天然石墨粉;用准等静压的方法制造球形燃料元件,性能指标达到了设计要求;建立并发展出高温堆燃料研究和发展所需的常规的及非常规的性能测试方法,满足了实验研究的需要。
A spherical fuel element was developed for China’s 10MW high-temperature test module stack consisting of a fuel zone in which the fuel particles are dispersed in a graphite matrix and a similar outer shell of a base material free of fuel, with no physical The interface. Improved the preparation process of the fuel gel core of the sol gel, both inside and outside the gel process advantages; coated fuel particles using TRISO structure, the cold performance of laboratory products and similar international similar products, the initial irradiation The result is good; the pure natural graphite powder is produced by the chemical purification process; the spherical fuel element is manufactured by the quasi-isostatic pressing method, the performance index meets the design requirements; the conventional And unconventional performance testing methods to meet the needs of experimental research.