The purpose of the test and evaluation of tamper indicating devices (TIDs) described in this report is to examine existing and commercially available TID technologies for specific use at the Mayak Fissile Material Storage Facility (FMSF). In this respect, TIDs that have been used under best international safeguards practices form a natural testing baseline. TID candidacy is based on TID performance with respect to mutually agreed functional, operational, and security requirements for the FMSF, taking into account both the U.S. and the Russian Federation views, as well as anticipated environments within the FMSF. Although some Russian views have been documented, very little information at the level required for formal test planning was received prior to the start of the testing campaign. Consequently, this report currently documents the results of environmental testing of U.S. TID candidates for a transparency and/or safeguards-and-security regime at the Mayak FMSF, based largely on best international safeguards practices.