  Let G be a finite group and K a number field. We show that the "k-th Adams
operation" defined by Cassou-Nogues and Taylor on the locally free class group
Cl(Z_K G) is a symmetric power operation, if k is coprime to the order of G.
Using the equivariant Adams-Riemann-Roch theorem, we furthermore give a
geometric interpretation of a formula established by Burns and Chinburg for
these operations.
