As per SAP post installation guide link below :
GRC Access Front-end - The web browser can be used to access embeded NWBC or GRC via Enterprise Portal.
We tried to expose the NWBC link through EP ivew.The connection goes through correctly and inital NWBC default menu comes correctly. However on subsequent click on Access control individual options system gives "portal Rune Time Error".
We are on EP 7.0 and are intending to upgrade to EP 7.02 and make use of GRC Business Package for End User Front End.