Home / Standards / NB/T 20646-2023 NB/T 20646-2023 Active 核电厂退役源项调查与放射性物质存留量估算 Standard Type NB ICS N/A CCS N/A Status Active Issue Date 2023-05-26 Implementation 2023-11-26 Centralized Committee 国家能源局 Issuing Authority 国家能源局