One comment on the possibility of single 5MW units or small clusters: they need not ever be”untended” in the sense that they will always be located, in the industrialized countries, in sites that already have some 24-7 staffing, such as service stations or electrical substations. However, technical monitoring will certainly be done remotely.
In terms of airplane crashes, there is nothing in the facility, certainly not the the decaborane, which has remotely close to the killing power of the crash itself.
