摘要
高温气冷堆中,燃料的平均燃耗比较深。随着235U的消耗和239Pu的累积,239Pu的裂变就将成为一个不可忽略的部分。通过理论计算,讨论了239Pu的裂变对于燃耗测量的影响。计算表明,当燃料球燃耗达到80 000(MW.d)/t(U)时,239Pu的裂变所贡献的燃耗份额约26.7%,239Pu裂变产生的137Cs和134Cs分别占其各自总活度的27.2%和23.2%;比较而言,利用137Cs活度来计算燃耗的方法比用活度比134Cs/137Cs好。
The portion of ^239Pu ill the nuclear fuel cycle of gas cooled high temperature reactor-pebble bed module（HTR-PM） is very important at the high level of burnup, which certainly influences the online burnup measurement. This problem was discussed in the paper. When the expected average burnup was 80 000 （MW· d）/t（U）, the calculation result showed that the energy release from ^239Pu fission contributed to the bumup of fuel pebble by 26.7% and the acitivity of ^137Cs and ^134Cs from ^239pu fission is about 27.2% and 23.2%, respectively. Further analysis also showed that it is better to determinate the burnup by the activity of^ 137Cs in the pebble than by the activity ratio of ^134Cs/^137Cs.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2008年第4期88-92,共5页
Nuclear Power Engineering
