Design optimization of the closed-water activation loop at the JSI irradiation facility
Design optimization of the closed-water activation loop at the JSI irradiation facility
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JSI 辐照设施闭路水活化回路的设计优化
DOI：
10.1016/j.fusengdes.2023.113632
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发表时间：
2023
影响因子：
1.7
通讯作者：
I. Lengar
中科院分区：
文献类型：
--
作者：
Domen Kotnik;Anil Kumar Basavaraj;L. Snoj;I. Lengar
斯洛文尼亚Jožef Stefan研究所的TRIGA研究堆正在建造一个闭水激活环，它将作为一个定义明确且稳定的高能伽马射线和中子源。这项工作的主要重点是分析和优化水活化回路的主要组成部分，以在合理的低压降下实现最高的活性。考虑了中子和水力两个方面。结果表明，理想的配置由内部活化部分和外部观察部分的高有效水量以及连接两者的窄输送管组成。对于主要的水活性同位素（16N，17N和19o），内部复杂的蜗牛形设计系统地优于其他简化设计两倍以上。活度值随着流量的增加而增加，但在0.5 l/s左右达到饱和。在此基础上，选择螺形作为内激活和外观察部分的主要候选。为保证闭环内的压降不超过3bar，将输送管的公称流量和内径分别设置为0.5 l/s和1.2 cm。
A closed-water activation loop is being built at the research reactor TRIGA at the Jožef Stefan Institute, Slovenia, which will serve as a well-defined and stable high energy gamma-ray and neutron source. The main focus of this work is to analyse and optimise the main components of the water activation loop to achieve the highest activity at reasonably low pressure drop. Both neutronic and hydraulic aspects were considered. The results show that the desired configuration consists of a high effective water volume of the inner activation part, outer observation part and narrow transport pipes connecting both parts. The complex snail-shape design of the inner part systematically outperformed other simplified designs by more than a factor of two for the main water activated isotopes (16N,17N and19O). The activity values increase strongly with increasing flow rate, but reach saturation at about 0.5 l/s. On this basis, the snail configuration was selected as the main candidate for both the inner activation and outer observation part. To not exceed the pressure drop of 3 bar within the closed-water loop, the nominal water flow rate and the inner diameter of the transport pipes were set to 0.5 l/s and 1.2 cm, respectively.