[en] The purpose of this paper is to summarize the results of the fission product examinations performed on samples from the TMI-2 reactor vessel and to evaluate the chemistry that resulted in the observed behavior. As part of the TMI-2 core examination program, samples were examined from all regions within the reactor vessel, from leadscrews in the top head to prior molten material relocated to the lower plenum of the reactor vessel during the accident. These results indicated significant variations in fission product behavior that were generally consistent with the volatility and chemical behavior of the fission product species. Low volatility species were retained almost entirely in the fuel material matrix (¹⁴⁴Ce), whereas unoxidized species (e.g., ¹²⁵Sb) were found with the metallic structural materials, and there was a significant release of the high volatile species (¹³⁷Cs and ¹²⁹I) from the high temperature portions of the fuel. 15 refs., 1 fig., 5 tabs