It is of course for Caledonia, as a class of two-five vessel.
Armament consist of:
Missiles from Mk-13 that later has to be rebuild to fit Mk-26 and then VLC
1*twin 155mm gun for mostly shore bombing. but can engage other vessel or if in need as a AA battery.
some 40mm and 30mm Where 30mm will later be replaced by Phalanx or Goalkeeper. 40mm can perhaps be replaced with some sort of a RAM system during a refit.
torpedoes the classic way.
Bellow deck hangar with place for 2-3 helicopters and a separate helicopter workshop.
Electronics:
Sonars hull mounted and towed.
SPS-49.
CGN-1 4-illimuninator (2 forward, 2 aft), CGN-2 5-illimuninator (3 forward (2 side by side), 2 aft)
The big radar: Very high power long range radar (What type of a task this radar can do is probably a ques for those that can radars) Note Have tried to draw it as a 2 in 1 radar (on small and long radar, The metal thing on top of the grid radar.)
She is nuclear I thing two small reactors with 2-3 diesel generator in a support system, the drive is of course electric.
speed: High, with a 20++++ knots cruise speed.
If you want, you can come with 3 or more refit ideas that are most likely she is getting during her career with real world weapons and electronics.