Some of the abstracts will give insight into what the NSSS/reactor suppliers are considering.
http://www.inspi.ufl.edu/topfuel2009/program/
See - Advances in Water Reactor Fuel Technology and Testing
This paper is a good summary - Codes & Methods Supporting AREVA Fuel Solutions for the Future - Development Strategy
http://www.inspi.ufl.edu/topfuel2009...racts/2191.pdf
Westinghouse has a New Reactor Core Engineering (NRCE) group, and AREVA has their EPR Project group.
GE is working with Hitachi with their ABWR and ESBWR.