residual liquid directed into the steam dryer 22 the remaining liquid is separated from the vapor by the steam dryer 22 again with the liquid returned to the downcomer 48 and the vapor directed into a turbine 50 fig8 through main steam lines 46 referring to fig1 and 2 an ecp probe assembly 100 includes electrochemical potential ecp probes 110 an upper brace 111 and a lower brace 112 for lateral support of the ecp probes 110 and an ecp cover 114 the ecp probes 110 transmit signals that are analyzed by a suitable processor not shown in an analysis instrument for collecting and processing data sensed by the ecp probes 110 the illustrated ecp probe assembly 100 is configured to measure the ecp of water in a conduit 116 that is upstream or downstream from a reactor water cleanup rwcu system 120 shown in fig8 particularly the exemplary ecp probe assembly 100 is mounted in a flange 122 shown in fig2 attached to the conduit 116 such that the ecp probes 110 and ecp cover 114 partially extend into or otherwise encounter the flow 124 fig7 through a conduit 116 in fig2 the flange assembly is shown in its upside down orientation although the ecp probe assembly can be mounted in any azimuthal orientation relative to the pipe axis the ecp probe assembly 100 is configured to monitor.