As the stainless steel seamless pipe for the reprocessing apparatus, the carbon content is reduced in order to strongly control the chromium-carbon compound in the welding-affected portion, or the content of silicon and phosphorus is limited in the 310Nb steel. Further, in the 304ULC steel, a steel industry which strongly limits the phosphorus content to 0.015% or less in order to improve the corrosion resistance in nitric acid is produced. 65% boiling nitric acid corrosion test was repeated 20 times. If the corrosion-resistant material was not more than 0.1 mm / a and the sensitized material at 650C for 2 hours had a corrosion degree of 0.2 mm / a or less , With excellent corrosion resistance.
Titanium and Ti-5a alloys with improved corrosion resistance have been used in the East Sea reprocessing plant in Japan to produce U, Pu solution evaporation boilers and heat recovery evaporation boilers. In addition, because zirconium has a stable corrosion resistance in a nitric acid environment, zirconium is used in a continuous dissolution tank in a reprocessing plant at Rokkashimura, Aomori, Japan.
