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提出了一种长寿期钠冷快堆的堆芯换料设计。基于增殖焚烧的燃耗策略,通过定期径向倒料,堆芯在不换料的情况下能够维持较长时间的临界,进而实现反应堆的长寿期设计。在本次方案设计中,采用一次通过的燃料循环方式,以U-Zr合金作为燃料材料,有利于防止核扩散;采用非均匀的布料方案,有利于内增殖组件的增殖以及展平堆芯功率分布;采用内收敛的径向倒料方式,有利于增殖组件的增殖与焚烧,提高堆芯寿期。初步计算结果表明,这种倒料策略是可行的。反应堆可以通过堆内倒料,实现38年不换料的运行,并且卸出的增殖组件可以用作下一个新堆芯的驱动组件,使新堆芯达到临界。堆芯关键参数都在现有长寿期快堆概念设计的可接受范围内。
A core refueling design of long-life sodium-cooled fast reactor was proposed. Based on the fuel burn strategy of multiplicative incineration, the core can be maintained for a longer period of time without refueling through periodic radial back-feeding, and then the long-life design of the reactor can be realized. In the design of this project, adopting a once-through fuel cycle mode, using U-Zr alloy as a fuel material, is conducive to preventing nuclear proliferation; using a non-uniform distribution scheme is conducive to proliferation of inner propagation components and flattening core power Distribution; Adopt the convergent radial back-feeding mode, which is beneficial to proliferation and incineration of proliferation components and increase core life. The preliminary calculation results show that this dumping strategy is feasible. Reactors can be refueled through the heap for 38-year, non-refueling operations and the unfolded multiplication components can be used as the driving components for the next new core to bring the new reactor to a critical mass. The key parameters of the core are within the acceptable range of the conceptual design of the existing long-life fast reactor.