The paper investigated the influence of nitrogen on pitting corrosion in austenitic Cr-Ni steels of grades 18Cr-9Ni and 16Cr-11Ni-3Мo and their welded joints under parking conditions. It was established that increasing the content of nitrogen while decreasing the carbon content had a positive influence on the pitting resistance. We determined the value of the critical temperature of pitting formation and the safe range of temperature and composition of the environment ensuring no pockets of local corrosion can emerge while the FBR-1200 equipment is stored, installed, or put into operation.