To support NASA's future Ocean Worlds Exploration missions, Advanced Cooling Technologies, Inc. developed a thermal management concept for a radioisotope-powered ice melting probe. The concept consists of integrated thermal features for efficient and reliable ice penetration, designed to deliver maximum power fraction for forward melting and to mitigate challenges encountered by the probe in icy environments. To characterize thermal performance, large-scale ice melting tests were conducted by submerging the probe into a liquid nitrogen cooled ice container. Three different bulk ice temperatures were tested (-2°C, -21°C, and -26°C). The probe did not see any significant difference in performance, proving it can operate in a range of different environmental conditions. For each melt test, a power input of 500-600W was reached by incrementally increasing the power as the probe descended into the ice. As measured by a linear displacement sensor, the probe was able to maintain a reasonably constant melting speed throughout each test, indicating the probe did not encounter tail refreezing and was able to adjust as it descended further into the ice. The tests performed demonstrated that the integrated thermal management features developed during this program can effectively transport heat generated from the heat sources and sufficiently dissipate this heat to the front end of the probe and further into the environment, successfully melting the ice and allowing decent. These results are promising for the future development and advancement of such applications for both terrestrial and extraterrestrial ice melting probe designs, highlighting the importance of efficient thermal management systems.