Abstract
Abstract In the lithium loop of IFMIF (International Fusion Materials Irradiation Facility), the target value of the nitrogen concentration in lithium flow is designed to be 99.9999 %), it was contaminated by nitrogen as an impurity of the cover gas. Therefore, the hot trap experimental pot sealed was placed in a vacuum exhaust glove box. In order to minimize nitrogen contamination, lithium sampling for nitrogen concentration measurement was carried out by scraping out lithium in a solid state. Then, nitrogen concentration was determined by the ammonia conversion method. As a result of the hot trap experiment under the above conditions, the nitrogen concentration in lithium was reduced from 43 to 10 wt.ppm by immersing Fe-5at.%Ti grains (∼160 μm) at 509 ℃ after 192 h, from 62 to 9.8 wt.ppm at 550 ℃ after 168 h, and from 65 to 9.9 wt.ppm at 557 ℃ after 144 h.
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