Review on Relationship Between Hot Functional Test Water Chemistry and Corrosion Behavior of Related Component Materials in Pressurized Water Reactor Nuclear Power Plants
Hot functional test(HFT)involves a number of pre-operational exercises without fuel per-formed to confirm the operability of newly constructed nuclear power plants in the conditions expected during both normal and off-normal operations of a pressurized water reactor(PWR).HFT water chemistry provides an opportunity to produce a stable and protective oxide scale on the key equipment in the prima-ry coolant of PWR which can greatly reduce the corrosion rate of the substrate,the release of the metal ions and the incorporation of activated corrosion products during the subsequently long-term normal oper-ations,and furthermore,relief the dose rate and decrease the corrosion rates of the related component materials for the nuclear power plants.HFT water chemistry adopted in PWR nuclear power plants and the evaluation methods for the HFT water chemistry optimization are reviewed in the present work.The effect of boric acid,lithium hydroxide,pHT,dissolved hydrogen and Zn injection on the corrosion behavior of key components materials are analyzed.Challenges and trends for HFT water chemistry optimization in the future are also addressed.
PWR nuclear power plantshot functional testwater chemistrydose ratecorrosion rate