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随着时间延长,贮存在压力容器中的氚含量不断减少,减少量的一部分衰变产生氦-3,另一部分扩散到容器壁中.扩散到容器壁中的氚又一部分衰变产生氦-3,另一部分在壁中继续扩散直至渗透到容器外.在容器壁中的氚和氦-3会引起材料力学性能变化,从而导致容器承载能力改变.同时考虑容器内部和容器壁中氚的衰变和扩散,建立求解贮氚容器壁中氚和氦-3浓度的解析理论模型,导出了氚和氦-3浓度的理论公式.通过解析计算给出了器壁中氚和氦-3浓度的时空变化曲线和规律,提出了氦-3浓度的2倍定律,即处于开放空间的贮氚球形高压容器,器壁中氦-3的浓度呈内高外低的分布,时间越长,浓度沿径向的梯度越大,在时间足够长时,各处浓度逼近时间无限长时的最终值,也就是最大值,内表面处的最大值是该处氚初始时刻浓度的2倍.
With the extension of time, the tritium content stored in the pressure vessel continues to decrease, a part of the decrease decays to produce helium-3 and the other part diffuses into the vessel wall, the tritium diffused into the vessel wall decays to produce helium-3, Part of the wall continues to spread until it penetrates to the outside of the container.Tritium and helium-3 in the container wall can cause changes in the mechanical properties of the material, resulting in a change in the carrying capacity of the container, taking into account the decay and diffusion of tritium inside the container and in the container wall, The theoretical model of tritium and helium-3 concentration in tristimulus container wall was established, and the theoretical formula of tritium and helium-3 concentration was deduced.The spatio-temporal change curve of tritium and helium-3 concentration in the wall was given by analytical calculation and Law, proposed a law of 2 times the concentration of helium-3, that is open-space storage tritium spherical pressure vessel, helium-3 concentration in the wall was high inside and outside the low distribution, the longer the concentration along the radial gradient When the time is long enough, the final value, that is, the maximum value when the concentration approaches the infinite time limit is everywhere, and the maximum value at the inner surface is twice as high as the initial concentration at the tritium site.