Barbara,

NRL may stand for "Naval Research Laboratory".  I'm not sure about the other
one.

Scott Morris
University of Illinois
Department of Nuclear Engineering
211 Nuclear Engineering Laboratory
103 South Goodwin Avenue
Urbana, IL  61801-2984

Phone:  (217) 244-4949
Fax:    (217) 333-2906
e-mail: xxxxxx@uiuc.edu