safe nuclear reactors, the operators perform at an optimal level and many are highly trained. they're very good at what they do but they can make mistakes and the more they're operating under these very, very challenging conditions, the more that they have the likelihood of making mistakes or operating incorrectly. one of the good things from a nuclear safety perspective that's happened is some of these reactors have gone into more of a shutdown mode which dramatically reduces the chance they could have a large radiation release but as joe mentioned, that means they don't have electricity supply around the country. i think that will be where you really have this very, very difficult choice that ukrainian forces will have to make, how much do they defend these facilities knowing know that the russians are willing to use artillery or other weapons to attack them or simply turn the plants over and then operate them at gunpoint? i think that's a very, very difficult choice that ukraine