Feasibility study on application of laser induced breakdown spectroscopy for detection & identification of failed fuel pins and sodium–water reaction in fast reactors,Journal of Analytical Atomic Spectrometry

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Feasibility study on application of laser induced breakdown spectroscopy for detection & identification of failed fuel pins and sodium–water reaction in fast reactors
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2020-05-08 , DOI: 10.1039/d0ja00077a
J. Namitha _{1,

2,

3} , U. K. Maity _{1,

2,

2,

3,

4} , T. Selvalakshmi _{1,

2,

3} , P. Manoravi _{2,

3,

4} , G. V. S. Ashok Kumar _{2,

3,

4} , M. Joseph _{1,

2,

2,

3,

5} , N. Sivaraman _{1,

2,

2,

3,

4}

Affiliation

In a fast reactor, during the analysis of the core cover gas, the presence of gaseous fission products, namely, Kr and Xe or the presence of He (in the case of He bonded fuel pins) would indicate the occurrence of fuel pin failure. Similarly, detection of hydrogen (H₂) in the surge tank cover gas indicates the possibility of sodium–water reaction. Analysis for the presence of such gases in the cover gas is mandatory towards safety considerations of any fast reactor. This study demonstrates the feasibility of the application of laser induced breakdown spectroscopy (LIBS) for the detection of H₂, He, Kr and Xe gases in ultra high purity (UHP) Ar, similar to the cover gas of a fast reactor. The characteristic emission lines at 656.21 nm (H_α), 587.4 nm, 877.67 nm and 881.84 nm are chosen for the quantitative analysis of H₂, He, Kr, and Xe, respectively. The calibration curve for all these gases shows a linear fit with a good correlation coefficient. The detection of H₂ is found to have interference from the moisture content present in the LIBS sample chamber. The results on identification of the non-overlapping emission lines of these gaseous species, calibration curve, limit of detection, reproducibility and potential application in fast reactors are discussed in this study.

中文翻译：

激光诱导击穿光谱法在快速反应堆中检测和识别失效的燃料销和钠水反应的可行性研究

在快速反应堆中，在分析堆芯覆盖层气体时，存在气态裂变产物（即Kr和Xe）或存在He（对于He结合的燃料销而言）将表明发生了燃料销故障。同样，在缓冲罐盖罩气体中检测到氢气（H ₂）表示钠与水反应的可能性。对于任何快速反应堆的安全考虑，必须对覆盖气体中此类气体的存在进行分析。这项研究证明了应用激光诱导击穿光谱法（LIBS）来检测超高纯（UHP）Ar中的H ₂，He，Kr和Xe气体的可行性，类似于快堆的覆盖气体。在656.21纳米（H的特征发射线_α分别选择587.4 nm，877.67 nm和881.84 nm进行H ₂，He，Kr和Xe的定量分析。所有这些气体的校准曲线都显示出具有良好相关系数的线性拟合。发现H ₂的检测受到LIBS样品室中水分含量的干扰。讨论了鉴定这些气态物质的非重叠排放线，校准曲线，检测限，重现性和在快速反应器中的潜在应用的结果。

更新日期：2020-07-08

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