Got a couple of Fuel Pool Cooling/Cleaning Hx's that have had a degrading trend in their heat transfer performance. Had a bid for a vendor to perform (proprietary) cleaning and was subsequently told to perform the restoration of the Hx's "inhouse" and a heck of a lot cheaper. Anyone have any tales to tell about:
1) Chemicals used (this is a BWR with HWC and GEZIP, no NMC as yet)
2) Resins used for cleanup and return to service of water
Most likely fouling mechanism is macro (FME introduced over the years through Fuel Pool skimmer tanks), iron oxide, and possible adherent from chemicals used for reactor cavity decon.
Appreciate any help I can get.