Has anyone seen an increase in RCS iodine activity in the RCS without a concurrent cesium indication? Xe-133/135 also increased. This occurred at steady state, full power conditions - no opportunity for washout from an existing failed rod. We are puzzled by the lack of cesium as all our models indicate that it should be present when the iodine increase occurred.

Clint Alday Reactor Engineering Waterford 3 calday@entergy.com