OKh18N10T steel corrosion resistance investigation in gadolinium nitrate solutions in nuclear reactor fluid poison control conditions

Laboratory, capsule and loop tests of OKh18N10T steel corrosion resistance in gadolinium nitrate solutions in the WWR-M reactor are conducted. Gadolinium concentration in different tests changed from 0.011 to 1.22 mol/l, the temperature changed from 20 to 80 deg C, the pressure did not ceed 1.6 MPa. Investigation has shown that OKh1810T steel corrosion in gadolinium nitrate solutions is of uniform character irrespective of surface condition, gadolinium nitrate concentration, tests duration, reactor radiation process and mechanical pressure presence. Local types of corrosion on surface and in the area of welded joints are not found. Lotal corrosion rate does not exceed 1.9+-1.1 mg/(m2xh). OKh18N10T steel in gadolinium nitrate solution processes a high corrosion resistance and may be used as construction material to make equipment for systems of liquid ractivity regulation in low-temperature nuclear reactors