If you have Redpower installed, then your "Personal" Safes are no longer personal, you can use ANY Redpowerblock, that can extract Items out of Containers, to steal Items out of Safes. Also you can use the Blockbreaker, which is even able to spit out the Stuff of the Safe behind it (The Blockbreaker CAN'T do that with Vanillachests!), to mine the Safe and get all the Stuff without the need of any other effort.
As of the Fact, that these Safes are even Nukeproof, i would consider that as Bug.
I know Redpower is Eloraams Stuff, but cant there be a workaround about this Securityproblem?