Operators report frequent problems with E-102, which are to be investigated. The PFD for the plant' s 100 area is reviewed, and E-102 is identified as the "Reactor Effluent Cooler." The process stream entering the cooler is a mixture of condensable and noncondensable gases at 654 C that are partially condensed to form a two-phase mixture. The coolant is water at 30 C. These conditions characterize a complex heat transfer problem. In addition, operators have noticed that the pressure drop across E-102 fluctuates widely at certain times, making control of the process difficult. Because of the frequent problems with this exchanger, it is recommended that E-102 be replaced by two separate heat exchangers. The first exchanger cools the effluent gas and generates steam needed in the plant. The second exchanger uses cooling water to reach the desired exit temperature of 38 C. These exchangers are to be designated as E-107 (reactor effluent boiler) and E-108 (reactor effluent condenser).