In 1985, at Novovoronezh NPP (NVNPP), the leakage occurred of liquid radioactive waste (LRW) from the storage facility No. 2 (SLW-2) into the soil. According to the fulfilled assessments, the total volume of LRW penetrated into the soil was about 480 m3, the total activity of 60Co was 76 TBq (2050 Ci) and of 137Cs – 15 TBq (390 Ci). The total activity of other radionuclides was less than 0,037 TBq (1 Ci). The salt contents in LRW were 120–150 g/l. Thus, 60Co was the main contaminant of the environment.