Sure, terrorists will rummage around these and steal the fuel rods. Then they somehow figure out how to make a thermonuclear weapon.
"Standard LWR fuel in 17 x 17 configuration, each assembly 2 meters (~ 6 ft.) in length; up to 24-month refueling cycle with fuel enriched at less than 5 percent"
Frankly, I think the most dangerous countries have nuclear weapons already. I mean of course those countries prone to starting imperialistic wars, threatening their neighbors, apartheid, etc.
I would be rather concerned if Iran gained nuclear weapons. They have recently had both overt and covert wars of aggression and have threatened their neighbors etc. But they have also had a recent insurgency demonstrating instability.
"Standard LWR fuel in 17 x 17 configuration, each assembly 2 meters (~ 6 ft.) in length; up to 24-month refueling cycle with fuel enriched at less than 5 percent"