CX-016153: Irradiation Testing of Accident Tolerant Fuels in the Advanced Test Reactor Water Loop Revision 1

This environmental checklist (EC) is being revised to add the following scope to the proposed action:
The Accident Tolerant Fuels (ATF) Project is in the pre-irradiation design validation phase for a water loop experiment, designated as ATF-2, to be irradiated in the Idaho National Laboratory (INL) Advanced Test Reactor (ATR) in 2018 as analyzed in the original EC.  Prior to insertion of the ATF-2 experiment in the ATR, a Sensor Qualification Test (SQT) is required to validate sensor performance and structural stability. In order to validate the calculated /expected operation of the ATR SQT, the ATF Project has determined that an SQT mock-up assembly should be conducted out-of-pile (i.e., not in a nuclear reactor) under similar pressures and temperatures to verify the test can withstand the required test conditions prior to ATR insertion. This out-of-pile test will be conducted at the Westinghouse Advanced Loop Tester (WALT Loop) at the Westinghouse mechanical testing facility, located in Churchill, Pennsylvania.