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| Idemitsu Kosan Co Ltd |
| Imperial College London |
| Industrias Nucleares do Brasil S A (INB) |
| Intelligent Systems |
| International Center for Environmental Safety of Minatom of Russia (ICES) |
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| International Uranium Enrichment Centre |
| Internexco GmbH |
| Israel Atomic Energy Commission |
| ITOCHU Corporation |