BUBBLING UP? This is a new custom glass test cell developed by Oak Ridge National Laboratory to observe how gases behave inside a molten salt fueled reactor. Some molten salt designs operate on liquid fuel. Nuclear and chemical reactions from these designs can result in gases that bubble out of the molten salt, which can impact reactor neutronics and thermal hydraulic performance. To better understand this behavior, researchers injected small helium and krypton bubbles into the cell filled with