12.118. Antimony remains in elemental form upon being released from failed fuel elements and tends not to react with steam or hydrogen in the cooling system. Since its boiling point is 1380°C, it will vaporize under accident conditions and deposit on system surfaces. However, it can alloy with other metals, which would tend to reduce its vapor pressure.

Alkaline earths

12.119. Strontium and barium are released from failed fuel rods as oxides and could react in the cooling system with steam to form hydroxides
which are moderately soluble in water. The presence of carbonates in emergency cooling water would result in precipitation of the alkaline earths from the hydroxides, thus preventing their release from the containment to the environment.

Other fission product groups

12.120. Noble metals, rare earths, and refractory oxides are generally chemically inactive. However, upon possible release into the containment during a severe accident, they could be transported as fine particles such as aerosols.