| Term | Definition |
|---|---|
| UCLA | University of California at Los Angeles |
| ultimate heat sink |
The atmosphere, a body of water or ground water (or a combination of these), to which generated heat is transferred during all ITER states. |
| ultra-high-quality vacuum | See vacuum pumps. Ultra high quality vacuum has a gas pressure lower than 1 µbar . |
| unscheduled down time | The down time of the plant not according to plan. |
| unscheduled non-operating state | When the plant or component is down according to plan for the length of the unscheduled down time due to an off-normal event. |
| US | United States of America |
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