High-temperature filter elements for water cooled reactors

Purpose: To prepare filter materials having high adsorption performance for cobalt in reactor water, with no risk of leaching into the reactor water and good fabricability even in a reactor water at high temperature and high pressure. Constitution: The surface of steel containing Cr (9 to 20 % by weight), Mn (9 to 25 %), C (less than 0.5 %), N (less than 1 %), and Si (less than 2 %) is oxidized, to which cobalt can be selectively adsorbed. Thus, the adsorbing performance for cobalt in the reactor water can be increased. (Yoshihara, H.)