Abstract: For meeting with the requirements of preparedness and response in case of a nuclear emergency of HPR1000,a system used to assess the core damage status and to estimate the source term released to the environment must be developed.The development of Emergency Condition Assessment System for HPR1000 (ECAS-HPR1000) was introduced,including its software framework,assessment modules,platform and data interfaces,etc.The system adopts the JAVA language as the platform,and open source MySQL as the data management system,supporting Windows and Linux OS.There are five subsystems,including 1) basic data acquisition subsystem,real-time acquiring the reactor operation parameters from Distributed Control System (DCS),2) core damage assessment subsystem,which used to assess the core damage status and degree,3) source term estimation subsystem,calculating the amount of radioactive material released from the core into the primary coolant system,containment and environment,4) assessment results display subsystem,5) user authorization management subsystem.

Key words: core damage assessment, source term estimate, nuclear emergency