Regulations on the Final Disposal of High Level Radioactive Waste and Safety Management of the Facilities Article 2

The terms used in these Regulations are defined as follows：1. High level radioactive waste final disposal facilities (hereinafter referred to as "disposal facilities"): facilities located in a proper geological environment a proper depth under the ground surface, which can safely separate the radioactive nuclides from the biosphere for a long time, including the buildings, structures and equipment on the related ground surface and in the disposal area of underground tunnels as well as the underground disposal area used to isolate highly radioactive wastes.2. Parent rock for disposal: the geological rock mass used to place highly radioactive wastes3. Multiple isolating walls: the multilevel combination of natural and engineering obstacles used to isolate or delay the filtering, leakage and transplantation of radioactive nuclides, including the waste itself, container, buffering and backfill materials, and stratum.4. Personal annual risk: the product of the annual probability of accidents incurring to the disposal facilities multiplied by the probability of death due to exposure to the radiation caused by the accident.5. Controlled area for disposal: the area of the ground surface and the underlayer of the ground surface within the scope of the disposal facilities, marked with proper signs indicating the boundary of the disposal facilities.