The fuel flow is supposed to stop at some point, faster you go, more energy you need, but if you keep adding fuel you'd exceed the turbine inlet temperature. Now, I converted this number to imperial (because I'm used to imperial in this case more than metric), and 274 kg/min equals to 36,233 pounds per hour, it sounds like a reasonable number maybe? Unfortunately, I don't have any consumption chart here.
But yes, I think the question is more of a "should the FF stop here or later?" type question than "is this number correct now?", if you know what I mean.