Abstract: For passive pressurized water reactor (PWR) nuclear power plant, spent fuel damage risk potentially induced by internal events was assessed. Spent fuel damage frequency (FDF) was quantified by event tree and fault tree model using probabilistic safety assessment software RiskSpectrum. For different operation conditions total FDF is 2.05×10^-9 per reactor-year which is much lower than core damage frequency (about 2.41×10^-7 per reactor-year). By assumption of completely radioactivity releasing, large radioactive release frequency caused by spent fuel damage is still one order of magnitude lower than that caused by core damage (about 2.38×10^-8 per reactor-year). Since the multiple prevention and mitigation measures in passive PWR nuclear power plant responding to spent fuel pool (SFP) accidents, the risk of SFP is much lower than that of reactor core, and the safety goals of nuclear safety guide can be achieved.