Atomic Energy Society of Japan

In a fusion neutron source, liquid Li has been applied as target material. For the safety operation of the liquid Li target, Li fire risk reduction is indispensable. In order to reveal the conditions of Li fire ignition for the Li target safety, an experimental study on Li fire has been performed under the IFMIF/EVEDA project. The humidity at which Li fire ignites was investigated by changing the humidity and heating Li samples. The compatibility between Li and a heat insulator was experimentally evaluated since the leaked Li from a loop contact with an insulator. From the results, it is revealed the insulator planned to be employed in a fusion neutron source, A-FNS, has no characteristics encouraging Li fire ignition.