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| Entered date | Event description | |
|---|---|---|
| ENS 51146 | 10 June 2015 20:09:00 | This event is being reported pursuant to 10 CFR 50.72(b)(3)(xiii) for a loss of emergency assessment capability at the Harris Nuclear Plant. Between March 24, 2015, and April 28, 2015, the meteorological data transfer process from the sensors to the emergency response facilities stalled intermittently five times. The control room staff was unaware of this condition for a maximum of 6.6 hours at any given time. When the data transfer process was stalled and the control room staff was unaware of the issue, the staff may have used inappropriate information in implementing the emergency plan. There was no impact from this condition because there were no actual emergencies during this time. On June 10, 2015, at approximately 1300 (EDT), further review of the impact of this equipment failure determined that this was reportable as a loss of emergency assessment capability. The condition that caused the data transfer process to stall has been corrected. In addition, measures have been implemented to ensure that if the data transfer process stalls again, backup sources of information will be used in accordance with the emergency plan to preclude loss of the assessment capability. There was no adverse impact to the public health and safety or to plant employees. The NRC Resident Inspector has been informed of this condition. Until this information is captured in a plant procedure, the licensee has issued a standing instruction. |