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由于短棒长期置于堆芯中,产生了对燃料燃耗的屏蔽效应等原因。因此,后来国际上有关压水堆核电站设计制造公司纷纷取消了短棒。针对这种情况,本文进一步研究了短棒的功能,讨论了短棒用于轴向燃耗控制的原理,提出将短棒分两组使用。短棒长度用三分之一棒或半棒,两组短棒交替进入堆芯的运行方式。其目的是扬长避短,变弊为利,最后达到一举三得的效果:(1)避免了短棒的屏蔽效应,保持了展平轴向功率分布和抑制氙振荡的功能。(2)用于轴向燃耗控制,对300MWe的核电站,首炉料可延长燃耗寿期10—15天,即可多发72—108GWh的电。(3)同四分之一棒相比,加大了短棒价值,兼氙棒使用,提高了电站变工况恢复功率的能力和速度。这种设计,对作日负荷循环的核电站尤为有利。
As the short rod placed in the core for a long time, resulting in a fuel-efficient shielding effect and other reasons. Therefore, international design and manufacturing of PWR nuclear power plants later canceled short rods. In view of this situation, this paper further studies the function of the short rod, discusses the principle of the short rod for axial fuel consumption control, and proposes to use the short rod in two groups. Short rod length with one-third rod or half rod, two short rods alternately into the core of the operation. The purpose is to avoid weaknesses, disadvantages to profit, and finally achieve the desired effect of one stroke after another: (1) to avoid the short rod shielding effect, maintaining a flat axial power distribution and inhibition of xenon oscillation function. (2) For axial fuel consumption control, for the 300MWe nuclear power plant, the first charge can extend the fuel consumption life by 10-15 days and generate 72-108GWh of electricity. (3) Compared with the one-fourth bar, the value of short bar and the use of xenon bar have been increased, which has improved the ability and speed of the power station to resume working under different working conditions. This design is particularly advantageous for nuclear power plants that have a load-carrying cycle.