调硼稀释对AP1000型压水堆一回路裂变产物源项影响研究

为了研究调硼稀释对压水反应堆一回路裂变产物源项的影响,利用一回路源项程序计算了平衡循环正常调硼,前段不调硼,整个过程不调硼三种条件下一回路裂变产物源项。结果表明,调硼稀释对平衡循环前期一回路源项影响不大,而对平衡循环后期一回路源项有较大影响,且不同类型核素受调硼稀释的作用大小也不同。最后为了判断调硼稀释对一回路各核素去除的相对作用,利用了图像法和比值法,结果表明两种方法均能较好表征调硼稀释对各核素的相对作用大小。

The Research of Boron Dilution Effection on Fission Products Source Terms

In order to study the effects of boron dilution on fission products source terms in primary loops of pressurized water reactor,a code was used to calculate the fission products source terms in reactor coolant under condition of normal boron control,no boron control in early stage and no boron control in whole stage during the equilibrium cycle.The results showed that boron dilution had a low impact on source terms in the early stage of the equilibrium cycle but a great influence in later stage.The degree of influence depends on the nuclide type.Finally,this paper used the methods of image and ratio to estimate the relative influence of boron dilution on nuclides removal of primary system coolant,the research demonstrated that both image method and ratio method could well characterize the relative effect of boron dilution on all nuclides.