Abstract
Heavy oil, as one of the most important energy sources in the world, is of great significance to its efficient exploitation. Heavy oil thermal recovery is a very important way. Therefore, to meet the demand of heavy oil thermal recovery energy supply, an energy supply system NCLFR-Oil based on lead-bismuth fast reactor was designed in the early stage. Based on the system analysis code ATHLET, a 40MW all-natural circulation lead-bismuth fast reactor system analysis model for heavy oil thermal recovery energy supply system was established. Three typical accidents, namely protected transient of over power (PTOP), protected secondary loop loss of heat sink (PLOHS) and station blackout (SBO), were studied respectively. The results show that all the parameters of the reactor are within the safety limits under the three kinds of protective accidents, which fully indicates the safety of the reactor. Among them, the PTOP accident has the smallest safety margin, while PLOHS accident has the highest safety margin. For PTOP, the maximum temperature of fuel pellet and cladding increased first and then decreased. The peak temperature was less than the safety limit, and reached the new steady state about 1000 s after the accident. For PLOHS, the maximum temperature of fuel pellet and cladding reached the new steady state at about 1000 s after the accident, while for SBO, it took longer to reach the new steady state at about 3000 s.
