Percentage of Core Fission Products by Element Released in Fuel-Overheat or Fuel-Melt Conditions
| Fission product type | Fuel overheat | Fuel melt |
| Noble gas (xenon, krypton) | 50 | 100 |
| Iodine | 50 | 100 |
| Cesium | 50 | 100 |
| Tellurium | 10 | 30 |
| Antimony | 2 | 2 |
| Barium | 1 | 20 |
| Strontium | 0.1 | 7 |
| Ruthenium | 0.01 | 0.7 |
| Lanthanum | Low | 0.01 |