Test of different measures for the prevention of scaling in the cooling system of Grohnde Nuclear Power Plant

摘要

In the cooling system of the Grohnde Nuclear Power Plant, heavy calcium carbonate precipitations have occurred in the turbine condenser and in the cooling tower since 1994. Those precipitations cause performance losses and high cleaning costs. Reasons for the intensified precipitation are apparently the biologically upgraded water quality of the river Weser, as well as specific operational conditions of the cooling system (partial recirculation of cooling water). It was noticed that the formation of calcium carbonate deposits occurred within a limited period of less than two weeks in May. The calcium precipitation was that strong during this time that it could not be stopped despite the immediate application of corundum cleaning balls in the tube cleaning system.