investigation. This significant improvement in the closure calculations have provided increased confidence  in the wear progression and the recovery procedures for the ISS thermal control system.  References  1. Birur, G. C., Bhandari, P., Gram, M. B., and Durkee, J., “Integrated Pump Assembly – An Active Cooling System for Mars Pathfinder Thermal Control,” Society of Automotive Engineers, 26th International Conference on Environmental Sciences, Monterey, CA, 1996. 2. Lockwood, M. K., Ercol, C. J., Cho, W. L., Hartman, D., and Adamson, G., “An Active Cooling System for the Solar Probe Power System,” AIAA, International Conference on Environmental Systems, AIAA-2010-6294, 2010. 3. Swanson, T. D. and Birur, G. C., “NASA Thermal Control Technologies for Robotic Spacecraft,” National Aeronautics and Space Administration, N20030031332, 2003. 4. Westheimer, D. T. and Tuan, G. C., “Active Thermal Control System Considerations for the Next Generation of Human Rated Space Vehicles,” AIAA AeroSpace Sciences Meeting, AIAA-2005-342, 2005. 5. Paris, A. D., Bhandari, P., and Birur, G. C., “High Temperature Mechanically Pumped Fluid Loop for Space Applications – Working Fluid Selection,” SAE International, 04ICES-282, 2004. 6. Shen, F., Drolen, B., Prabhu, J., Harper, L., Eichinger, E., and Hgyuen, C., “Long Life Mechanical Fluid Pump for Space Applications,” AIAA AeroSpace Sciences Meeting, AIAA-2005-273, 2005. 7. Baldauf, R. W., Kawecki, T., Purdy, W., and Hoang, T. T., “Development of a Bearingless Ammonia Pump for Spacecraft Thermal Control,” NRL Review, 2008. 8. Shen, F., Drolen, B., Prabhu, J., Harper, L., Eichinger, E., Nguyen, C., “Long Life Mechanical Fluid Pump for Space Applications,” 43rd AIAA Aerospace Sciences Meeting, AIAA-2005-273, January 1013, 2005 9. Lockwood, M. K., Ercol, C. J., Cho, W. L., Hartman, D., and Adamson, G., “An Active Cooling System for the Solar Probe Power System,” AIAA 40th International Conference on Environmental Systems, AIAA-2010-6294, 2010. 10. Paris, A. D., Bhandari, P., and Birur, G. C., “High Temperature Mechanically Pumped Fluid Loop for Space Applications – Working Fluid Selection,” SAE International, 04ICES-282, 2004. 11. Bloch, P. E., “Understanding Canned Motor Pumps,” Maintenance Technology, September 1, 2008. 12. Foszcz, J. L., “Canned Motor Pumps,” Plant Engineering, June 3, 1993. 13. Bruckner, R.J., Manco R. A., “ISS Ammonia Pump Failure, Recovery, and Lesson Learned – A Hydrodynamic Bearing Perspective”, Proceedings of the 42nd Aerospace Mechanisms Symposium, NASA Goddard Space Flight Center, May 14-16, 2014. 14. Jeon, H. G., Lee and Y. Z., “The Evaluation of Wear Life Based on Accelerated Test through Analysis of Correlation between Wear Rate and Lubricant Film Parameter,” Tribology Transactions , February 19, 2013. 15. ASTM International, “Standard Test Method for Wear Testing with a Pin-on-Disk Apparatus,” G99-05, reapproved 2010. 16. Gomes, J. R., Silva, O. M., Silva, C. M., Pardini, L. C., and Silva, R. F., “The Effect of Sliding Speed and Temperature on the Tribological Behavior of Carbon-carbon Composites,” Wear , Elsevier, Vol. 249, pp. 240–245, 2001. 17. Lancaster, J. K., “Dry Bearings: A Survey of Materials and Factors Affecting their Performance,” Tribology , December 1973. NASA/CP—2018-219887 508