Prepare the radicchio, vinaigrette (mixed with a touch mayonnaise or not, as you wish) and chives finely chopped.
Right before serving, set scallops in a wide skillet; barely cover with water and just bring to a simmer, cover and simmer one minute. Remove from heat and pat dry.
Mix warm scallops and radicchio together and set on dinner plate. Drizzle dressing over top and garnish with chives.