.TRANSFORM.Nuclear.ReactorKinetics.SparseMatrix.Reactivity.Isotopes.Lumped.PartialIsotopes.Data .TRANSFORM.Nuclear.ReactorKinetics.SparseMatrix.Reactivity.Isotopes.Lumped.PartialIsotopes.Datarecord Data = TRANSFORM.Nuclear.ReactorKinetics.SparseMatrix.Data.Isotopes.Isotopes_null;