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首页> 外文会议>20th International Symposium on Effects of Radiation on Materials, Jun 6-8, 2000, Williamsburg, Virginia >An Evaluation of Through-Thickness Changes in Primary Damage Production in Commercial Reactor Pressure Vessels
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An Evaluation of Through-Thickness Changes in Primary Damage Production in Commercial Reactor Pressure Vessels

机译：商用反应堆压力容器一次伤害产生的全厚度变化评估

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An extensive database of atomic displacement cascades in iron has been developed using the method of molecular dynamics (MD). More than 300 simulations have been completed at 100K with energies between 0.1 and 100 keV. This encompasses nearly all energies relevant to fission reactor irradiation environments since a 100 keV MD cascade corresponds to the average iron cascade following a collision with a 5.1 MeV neutron. Extensive statistical analysis of the database has determined representative average values for several primary damage parameters: the total number of surviving point defects, the fraction of the surviving point defects contained in clusters formed during cascade cooling, and a measure of the size distribution of the in-cascade point defect clusters. The cascade energy dependence of the MD-based primary damage parameters has been used to obtain spectrum-averaged defect production cross sections for typical fission reactor neutron energy spectra as a function of depth through the reactor pressure vessel. The attenuation of the spectrum-averaged cross sections for total point defect survival and the fraction of either interstitials or vacancies in clusters are quite similar to that for the NRT dpa. However, the cross sections derived to account for the energy dependence of the point defect cluster size distributions exhibit a potentially significant variation through the vessel. The production rate of large interstitial clusters decreases more rapidly than dpa whereas the production of large vacancy clusters is slower than dpa.
机译：使用分子动力学（MD）方法已经开发了一个广泛的铁原子级联反应数据库。在100K和0.1至100 keV之间的能量下，已经完成了300多次仿真。这几乎涵盖了与裂变反应堆辐照环境有关的所有能量，因为100 keV MD级联对应于与5.1 MeV中子碰撞后的平均铁级联。数据库的广泛统计分析已确定了几个主要破坏参数的代表性平均值：残存点缺陷的总数，级联冷却过程中形成的簇中所含残存点缺陷的比例以及对容器内尺寸分布的度量-级联点缺陷簇。基于MD的主要损伤参数的级联能量依赖性已被用于获得典型裂变反应堆中子能谱的谱平均缺陷产生截面，该截面是通过反应堆压力容器的深度的函数。频谱平均横截面对于总点缺陷存活率的衰减以及簇中间隙或空位的分数与NRT dpa的衰减非常相似。但是，为解释点缺陷簇尺寸分布的能量依赖性而得出的横截面在整个容器中显示出潜在的显着变化。大型间隙簇的生产率下降速度比dpa更快，而大型空置簇的生产率下降速度比dpa慢。

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