【作者】 李桃生； 曲静原； 张立国； 方栋； 焦南杰； 乐智希；

【Author】 LI Tao-sheng~1,QU Jing-yuan~2,ZHANG Li-guo~2,FANG Dong~2,Jiao Nan-jie~1,LE Zhi-xi~1 (1.College Of Nuclear Science and Technology,Harbin Engineering University,Harbin.150001,China; 2.Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing.100086,China)

【机构】 哈尔滨工程大学核科学与技术学院； 清华大学核能与新能源技术研究院；

【摘要】 球床式高温气冷堆的燃料平均燃耗比其他堆型更深。本文在燃耗计算过程中针对²³⁸U转换、堆功率和核素的反应截面选取这三个主要影响因素进行讨论,并对燃耗值与标示核素之间关系进行分析。计算结果表明,标示核素的平均中子核反应截面选取是一个很重要因素;对于高燃耗而言,可转换成易裂变同位素问题必须要考虑,当燃耗值为80 000 MWD/tU时,如²³⁹pu对燃耗贡献可达30%;堆功率对燃耗值分析过程中要考虑,尤其是利用¹³⁴Cs和¹³⁷Cs的活度比来确定燃耗值时影响较大。更多还原

【Abstract】 The average burn-up of gas cooled high temperature reactor-pebble bed module is higher than other reactor.Three factors of ²³⁸U transform,reactor power and selective cross-section nuclides are discussed in the process of Burn-up estimation.The relation of the burn-up value with the indicator nuclides is analysed in the paper.The estimation results are shown that the spectral averaged cross sections for some indicator nuclides is very important,and the problem of transfer fertile nuclide into fissile nuclide has to be considered for high burnup,and the contribution of ²³⁹Pu for bumup is 30%when the bumup is 80000MWD/tU,and the reactor power for the estimation process must be considered such as activities ratio of ¹³⁴Cs/¹³⁷Cs.更多还原