Home / Standards / NB/T 20631-2021 NB/T 20631-2021 Active 核电厂大范围损伤缓解导则编制和实施 Standard Type NB ICS N/A CCS N/A Status Active Issue Date 2021-12-22 Implementation 2022-03-22 Centralized Committee 国家能源局 Issuing Authority 国家能源局