论文部分内容阅读
本文研究了围板对堆芯中子经济的影响,并且经过不同厚度围板的零功率反应堆的实验,验证了理论予计的结果。尽管不锈钢通常被认为是一种寄生性中子吸收体,但发现围板增加到某一厚度时,反而提高了堆芯的中子经济效益。由于不同厚度不锈钢板反射中子的作用不同,当围板厚度由2.5cm(这是核电厂压水堆使用的一种代表性围板的厚度)增加到20cm(在结构设计中应将20cm的围板改变为不锈钢反射层组件)时,则30万kW的核电厂压水堆第一燃料循环的寿期将会延长40EF-PD。若把第一循环寿期转换为平衡燃料循环寿期(360EFPD),20cm不锈钢反射层则可多发33EFPD。再按40年的核电厂设计寿命(年负荷因子为0.8)折算,则可多发76亿度的电。如果不锈钢反射层用锆合金代替,其经济效益更大。
In this paper, the influence of coaming on the neutron economy of the core is studied, and the theoretical results are validated through the experiment of zero power reactor with different thickness of coaming. Although stainless steel is generally considered a parasitic neutron absorber, it has been found that increasing the thickness of the cladding to a certain thickness increases the neutron economics of the core. Since the effect of reflecting neutrons on different thicknesses of stainless steel plates is different, when the thickness of the coamings is increased from 2.5 cm (the thickness of a representative coamings used in pressurized water reactors of nuclear power plants) to 20 cm (in structural design, 20 cm The panel was changed to a stainless steel reflector assembly), then the lifetime of the first fuel cycle of the 300 MW nuclear power plant PWR will be extended by 40 EF-PD. If the first cycle life is converted to a balanced fuel cycle life (360 EFD), the 20 cm stainless steel reflector can emit 33 EFD. Then 40 years of design life of nuclear power plants (annual load factor of 0.8) conversion, you can send more 7.6 billion kWh of electricity. If the stainless steel reflector with zirconium alloy instead of its greater economic benefits.