Long term safety of spent nuclear fuel storage canisters is far from assured
Premature failure of U.S. spent nuclear fuel storage canisters, San Onofre Safety, “……. The dry cask systems …..may fail within 30 years or possibly sooner, based on information provided by Nuclear Regulatory Commission (NRC) technical staff.
There is no technology to adequately inspect canisters.
There is no system in place to mitigate a failed canister……..
Canisters may need to be replaced within 30-42 years or sooner.…
Recent information provided by the NRC technical staff indicates dry storage canisters may need to be replaced within 30-42 years or sooner, due to stress corrosion cracking of the thin (1/2 to 5/8 inch) stainless steel canisters (due to our coastal environment). Similar stainless steel materials at nuclear plants have failed within 16 to 33 years. The concrete overpacks also have aging issues that are accelerated in coastal environments…….
Recent information provided by the NRC technical staff indicates dry storage canisters may need to be replaced within 30-42 years or sooner, due to stress corrosion cracking of the thin (1/2 to 5/8 inch) stainless steel canisters (due to our coastal environment). Similar stainless steel materials at nuclear plants have failed within 16 to 33 years. The concrete overpacks also have aging issues that are accelerated in coastal environments………
No canisters approved for high burnup fuel for more than the initial 20 years.
High burnup fuel cladding damage The NRC has not extended licenses past the initial 20 years for storage of high burnup fuel (>45GWd/MTU) due to unknowns about high burnup fuel in storage and transport. This fuel is over twice as radioactive and hotter than lower burnup fuel. The NRC has allowed nuclear plants to burn fuel longer, without the research to show that it is safe in storage and transport. The protective fuel cladding can become brittle and crack; resulting is higher risk for radiation exposure, if the canisters fail……. https://sanonofresafety.org/2014/08/21/premature-failure-of-u-s-spent-nuclear-fuel-storage-canisters/
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nuclear-news 
Of course they are flawed, partially because Holtec makes the cheapest casks in America, which is why they are the most popular. Holtec has filed for literally Hundreds of certification exemptions for their crappy 1/2 inch casks, yet they are still in use today at most current or past NPP’s. Not that casks are a great idea to begin with, they vent directly to atmosphere and have failed and or caught fire in transit multiple times (that we Know of).
There is no good answer, but a true deep geologic repository bored into solid unfractured rock would be the best of the bad options. Also the most expensive, which is why it will never happen.