"Perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away." How would you "bloat up" a reactor that uses pass

"Perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away." How would you "bloat up" a reactor that uses passive convection, submerged in millions of gallons of emergency cooling water? Light Water Reactors aren't the ideal way to generate nuclear energy, but they're proven technology, and it's hard to imagine a safer LWR design than what NuScale is planning.