Measures were not taken to contervene an unkown risk
You are kidding I suppose ?
Leaks of fuel are unkown risk ?
Fuel is not a combustible ?
Fuel can't burn ?
Check the Concorde design
F.O tanks , gear and engines locations .. and you will understand why the risk was know already when for the first time the Concorde shows his Achilles heel ( tires )
On the many other incidents .. this was a luck factor working
You can't expect this will work fine everytime ...