89-04: Ultimate Heat Sink Thermal Performance Test at the River Bend StationThis paper describes the work associated with planning, preparations, and executionof these tests. This non conventional design tower would serve as the ultimate heat sink for the reactor plant following a postulated design basis accident. A temporary heat source was used, consisting of the three package boilers and associated equipment to supply steam to two temporary heat exchangers. The basin water was circulated through temporary piping to the