As aboveground test (AGT) simulators are developed and enhanced, underground test (UGT) data is in most instances used as the yardstick to which the simulator capability to replicate nuclear weapons effects is measured. rather than replicate nuclear weapons effects such as material spallation, surface vaporization, etc. the simulator should be capable of producing threat environment simulations. this is, ugt data used to support simulator development must in someway be associated with a threat environment. the objective of this phase i investigation is to close the loop by assessing which ugt's best simulate current threat environments. in addition, materials and structural configurations tested therein shall be identified with regard to test levels, test results, and system application. the results of this Phase I program are intended to enhance the development of nuclear weapons effects simulation techniques in that both threat environment and corresponding test results will be identified.
