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| Entered date | Event description | |
|---|---|---|
| ENS 54896 | 11 September 2020 13:56:00 | The following is a synopsis of the report received from the State of Nebraska Division of Radioactive Materials via phone: The licensee reported that while they were responding to a product jam alarm they discovered some water on the floor by the source storage pool. In reviewing the control system operation log, the operators found the system had responded to a low water level by opening the make-up water valve. This is a normal system occurrence due to evaporation from the pool. The make-up valve did not close upon reaching the normal water level, so level in the pool continued to rise. Level reached the high water alarm point which is at the top of the pool. The drain valve opened at the high water alarm point causing level to drop, but some water had already overflowed from the pool onto the surrounding floor. Level continued to lower and upon reaching the low level setpoint the system correctly responded by closing the drain valve and reopening the make-up valve. The level control system then responded correctly and the make-up valve closed when water level returned to normal. The irradiator facility has replaced the level switches and updated the preventative maintenance frequency for the valves and switches to prevent a repeat of this event. The source was never uncovered. No release or personnel exposure occurred. |