Full RT and 100% RT for vessel

The difference between 100% RT and Full RT acc. to ASME VIII div. 1?

ASME VIII Div. 1 specified full RT (RT-1), 0.85 , spot RT or random.
100% RT may be required in project specification.

In my opinion, 100% RT for all BW joint, included nozzle, head, LS, CS …