ZINO wrote:here is the first question what would the Rate of Fire be: Single shot only; so would it be hand to hand only ( this is vehicle-mounted ) ?
Single Shot. 1x per 15seconds.
The gun is designed with a 15sec. cycle time, that suggests there maybe a unstated required cool down time between shots which would still be present in a nuclear powered version.
Then there is the question of weather the nuclear power pack has the output necessary to allow one to fire the weapon every 15seconds (this can vary from platform to platform). Looking at the Power Leech RCC (WB12 pg126-8, its also in WB30 DBoNA, and a similar thing appears in a super power in RCB1r, so the math might change with other sources) the absorption limit of the Power Leech is 200MD per minute (a EClip holds ~200MD, Long ~300, and a Nuclear power vehicle/bot/pa can be drained at 200MD per minute). If we take the 200MD per minute output for simplicity, then it likely can not power the ATL-7 directly, you'd need some type of storage medium to allow it to fire, and even then with a basic system you'd be looking at a Rate 1 per minute (1 per 4 melees) possibly longer.
ZINO wrote:the second question is there a nuclear energy drum or nuclear pack back for I.D.K runs on years .(Would this work FOR supernatural PS, cyborgs, and power armor troopers)?
There probably are nuclear power packs (portable like used in Railguns) that will work. Rifts has Railguns that are powered by an Eclip, though most are tied into a nuclear reactor.
ZINO wrote:the thrid question is possible to extend the range by without loss damage output ????
By the rules you can technically fire 30% farther, but you take a strike penalty (RUE pg361, its in other main books to IINM).
Psi-Tech can increase the range by 10% (WB12 pg75), though this could be psionic alteration, physical alteration, or a mix. What the process is, could limit ability to stack (ex, an Operator does a pure physical alteration to get the 10% boost as suggested by Mack, but a Psi-Tech could then improve upon it further IF their work is psionic but not likely if it's physical).
A Gizmoteer (WB9 pg157-9) can out do a Psi-Tech at +5% per level, but the modification is temporary and can damage the weapon.
The existence of Blue-Green Lasers for underwater work (normal surface lasers reduce range by 1/2 underwater IIRC), might mean there is a similar color frequency that would work in the atmosphere (though I suspect everyone is already using it).
Fire the weapon in the vacuum of space.
A Techno-Wizard might also be able to whip something up (ex. Mystic Portal, but it would create a minimum range requirement, though I'm sure there are other ways).