KerTex Explosives Mod is a potent explosive device and causes big damage. It can be attached to any part and blow up all parts within a selectable radius between 1m and 25m. I think this is exactly what you need.
How to use: After clicking the K-Tex part a window will appear showing you the selectable explosion radius, the safe EVA distance (which is 5 times the set explosion radius) and a button to detonate the explosive device. Clicking again on the part when the detonator window is showing will remove the window. Once clicked on the ‘BOOOM!’ button, the explosive device will explode, taking down any part within the set explosion radius.
* KAS (Kerbal Attachment Systems)
* Universal Storage