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... armed assault and bomb attack on a nuke plant.

The primary system in a PWR operates at over 2000 psig (a BWR around 1000 psig), the reactor system and those downstream are robust enough to convert energy for a million customers -- what exactly size bomb do you think is necessary to cause damage to that equipment? Besides the inconvenient location between the bomber and the reactor system of a concrete shield building that is three-feet thick re-bar concrete in most locations inside of which is a free standing tank/building made of thick steel plate. The penetrations through the building are at least double isolation capable, and sometimes triple. You can know a plant, but the force you would need to apply in order to cause problems with the core is inpractibably large. The system is automated and engineered to first and foremost contain the fuel with redundant systems and defense in-depth processes. Even taking an operator at gun point it would not be possible to cause a significant release. The studies we have to do to get a license are hypothetical to validate the design of various systems. Taken together, the structures, systems and components within a nuclear plant will not allow your nightmare scenario.