A Design Study for 99Tc and 129I Transmutation in the HYPER System
A Design Study for 99Tc and 129I Transmutation in the HYPER System
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DOI：
10.13182/nse03-a2329
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发表时间：
2003-02
影响因子：
1.2
通讯作者：
W. Park;Yong Ho Kim;C. Park;J. S. Chung;Chang H. Kim
中科院分区：
文献类型：
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作者：
W. Park;Yong Ho Kim;C. Park;J. S. Chung;Chang H. Kim
摘要为了在不引起堆芯安全问题的情况下，最大限度地提高混合动力提取堆（HYPER）系统中99 Tc和129 I的嬗变，对裂变产物（FP）靶进行了设计研究。通过插入诸如CaH 2的缓和剂来获得局部热通量。已经研究了许多类型的目标设计概念。其中99 Tc被加载为在最外区域中的板型，并且129 I被加载为在内部区域中与CaH 2棒混合的NaI棒的概念被推断为在嬗变率和堆芯功率峰值方面是最有效的。建议的FP靶估计有一个净嬗变率为5.53%/有效全功率年（EFPY）和11.41%/EFPY的99 Tc和129 I，分别比其他快中子系统的嬗变率高得多。此外，HYPER系统对99 Tc和129 I的支持率分别为5.7和4.0，与TRU的支持率非常相似。加载FP目标的最大引脚功率峰值为1.232，在可接受范围内。FP靶的加载增加了TRU的存量，使堆芯冷却剂空泡系数更负，但多普勒系数的负性减小。建议的FP靶配置不会引起堆芯中子学方面的安全问题。
Abstract A design study for the fission product (FP) target was performed to maximize the transmutation of 99Tc and 129I in the Hybrid Power Extraction Reactor (HYPER) system without causing any core safety concerns. Localized thermal flux is obtained by inserting moderators such as CaH2. Many types of target design concepts have been investigated. The concept where 99Tc is loaded as a plate type in the outermost region and 129I is loaded as NaI rods mixed with CaH2 rods in the inner region is concluded to be the most effective in terms of transmutation rate and core power peaking. The proposed FP target is estimated to have a net transmutation rate of 5.53%/effective full-power year (EFPY) and 11.41%/EFPY for 99Tc and 129I, respectively, which are much higher compared to the transmutation rates in other fast neutron systems. In addition, the support ratios of the HYPER system for 99Tc and 129I are 5.7 and 4.0, respectively, very similar to the support ratio of TRU. The maximum pin power peaking with the loading of the FP target is 1.232, which is within the acceptable range. The loading of the FP target increases the inventory of TRU and makes the core coolant void coefficient more negative but the Doppler coefficient less negative. The proposed FP target configuration causes no safety problems in terms of core neutronics.