"self reinforced" nozzle often refers to a nozzle neck that provides sufficient reinforcing in the nozzle neck (and possibly the welds) without requiring additional area to be provided by excess thickness available in the shell.
Oftentimes, the term "self reinforced" refers to a forged nozzle that has a "heavy wall", transition, and a thinner end that is attached to piping (or it may have a flange) ... see Figure UG-40 Sketch "e" for this type of nozzle neck. Such forgings are provided by Forged Vessel Connections ("FVC") and other vendors (see
http://www.forgedvesselconn.com).
The "lip type" is a special variation of the heavy wall forging described above. The forging has a "lip" that allows for a butt joint weld into the shell rather than a corner joint. See the FVC web site and search for their "Q lip" type forgings. These are expensive and are used only for very demanding requirements.
Either of these (lip type or the heavy wall) can be designed per ASME Code rules same as any other nozzle. However, ASME does not provide any particular requirements or guidance for design of these forgings, other than the special requirements in Figure UG-40 sketch "e" for determining the normal limit of reinforcement.