Models of coefficient of thermal expansion (CTE) for Gilsocarbon graphites irradiated in inert and oxidising environments
Models of coefficient of thermal expansion (CTE) for Gilsocarbon graphites irradiated in inert and oxidising environments
复制标题
在惰性和氧化环境中辐照的 Gilsocarbon 石墨的热膨胀系数 (CTE) 模型
DOI：
10.1016/j.jnucmat.2012.08.022
复制
发表时间：
2013
影响因子：
3.1
通讯作者：
Eason E
中科院分区：
文献类型：
--
作者：
Eason E
本文介绍了辐射对先进气冷反应堆（AGR）中使用的Gilsocarbon石墨热膨胀系数（CTE）影响的经验模型的开发和验证。辐照和氧化联合模型部分基于惰性环境中快中子损伤的新模型。新的惰性模型表明，在非常低的剂量下，CTE值增加到“上层”辐照CTE值，然后CTE值随剂量增加而降低，遵循双曲正切函数。AGR中实际暴露的影响通过在剂量和CTE方向上移动惰性模型来建模，以与在操作AGR中从慢化剂砖中钻取的材料的CTE测量值一致。惰性模型中匹配钻孔数据所需的偏移因反应堆而异。新模型预测随机选择的验证数据，这些数据未用于模型拟合以及拟合校准数据。
This paper presents the development and validation of an empirical model of radiation effects on coefficient of thermal expansion (CTE) for the Gilsocarbon graphites used in Advanced Gas-cooled Reactors (AGRs). The combined irradiation and oxidation model is based in part on a new model of fast neutron damage in inert environment. The new inert model shows an increase to an “upper shelf” irradiated CTE value at very low dose, then CTE values decrease with increasing dose following a hyperbolic tangent function. The effect of the actual exposure in AGRs is modelled by shifting the inert model in both dose and CTE directions to agree with the CTE measurements on material trepanned from moderator bricks in operating AGRs. The shift in the inert model that is needed to match the trepanned data varies significantly by reactor. The new model predicts randomly-selected validation data that were not used in model fitting as well as it fits the calibration data.