I don’t see where in the cited CFR the special counsel has the authority to grant immunity.
See my thread here:
http://www.freerepublic.com/focus/f-news/3560542/posts
from the regulations:
“the Special Counsel shall exercise, within the scope of his or her jurisdiction, the full power and independent authority to exercise all investigative and prosecutorial functions of any United States Attorney”
To the extent a US Attorney could do an informal immunity letter agreement on his own, then the Special Counsel can do that, and to the extent a US Attorney must get permission for immunity from Main Justice, then presumably the Special Counsel would be under the same regime (i.e., same as a US Attorney).
I wonder though whether DOJ procedures are to have Rosenstein give any immunity approvals since he is the one determined not to have a conflict of interest and is in charge of the Special Counsel.
This news report on the grant of immunity seems rather speculative, however.