The Hardin Valley Campus (HVC) of Oak Ridge National Laboratory (ORNL) consists of three buildings located off of Cherahala Boulevard in Knoxville, TN, 37932.
(Please note: this is about 20 minutes from the main campus in Oak Ridge, TN)

The National Transportation Research Center (NTRC) at 2360 Cherahala Blvd. This is the first building on the left as you enter HVC.
The Grid Research Development and Innovation Center (GRID-C at 2370 Cherahala Blvd. This is the second building on the left after you enter HVC.
The Manufacturing Demonstration Facility (MDF) at 2350 Cherahala Blvd.
This is the third/last building after you enter the HVC. This is also where the Visitor Center is located for checking-in/registering. All visitors MUST check-in here before entering any of the buildings on the Hardin Valley Campus.
Google Maps: ORNL (Hardin Valley Campus from Turkey Creek)
Hardin Valley Campus Information: One-Sheet