Atomic minds, would you kindly fact check this info?

A popular LLM informs me that most SMR designs are fail safe (ie HTGR, MSR). Also that if an aeroplane crash split a reactor open, no clean up occurred and you stood next to it for a month then you would receive 10 mSv which is a radiation dose roughly equivalent to:
  - A full body medical CT scan
  - 10x long haul flights

And resulting in an elevated risk of cancer in later life of 0.05%.  If that is true, am I missing any other worse scenarios? Can a villain use cheap methods to cause hell?