The deposition of corrosion products in orifice of the steam generator of high temperature gas cooled reactor(HTGR) in nuclear power units threats to safe operation of the unit seriously. To effectively inhibit the deposition of corrosion products in the orifice

the influence of dissolved oxygen in water on the orifice deposition rate was studied under the simulated water condition in the secondary loop of the HTGR. Moreover

the variation law of ZETA potential with dissolved oxygen in iron solution was also studied. It is found that the deposition rate of corrosion products in the orifice area is extremely sensitive to the dissolved oxygen

it decreases with the increase of dissolved oxygen concentration in water. Secondly

over high pH value is not conducive to the inhibition of orifice deposition

which is mainly due to the effect of dissolved oxygen and pH value on the ZETA potential. The wall current electrokinetic effect plays an important role in the orifice deposition

and increasing the concentration of dissolved oxygen in feed water is an effective method to restrain the orifice deposition and clogging in the steam generator of HTGR.