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| Entered date | Event description | |
|---|---|---|
| ENS 53318 | 7 April 2018 11:59:00 | On April 7, 2018 at 0451 EDT, with Unit 1 in Mode 3 at 0 percent power, an auto actuation of 'A' and 'B' Motor Driven Auxiliary Feedwater (MDAFW) pumps occurred during the shutdown of Unit 1 for Harris Nuclear Plant's refueling outage. Plant Operators successfully took control of the AFW flow and noted the 'B' Main Feed pump was still running with proper suction and discharge pressures of 430 lbs. and 1000 lbs. The 'A' and 'B' Motor Driven Auxiliary Feedwater (MDAFW) pumps automatically started as designed when the 'Loss of Both Main Feedwater Pumps' signal was received. The cause of the actuation is still being evaluated. This event is being reported in accordance with 10 CFR 50.72(b)(3)(iv)(A) as an event that results in a valid actuation of the Auxiliary Feedwater system. There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. |
| ENS 52297 | 15 October 2016 15:46:00 | On October 15, 2016, while the Harris Nuclear Plant was shut down for a scheduled refueling outage, the reactor vessel head penetrations were being examined in accordance with the lnservice Inspection Program. Ultrasonic examinations identified a flaw in a head penetration nozzle. The unit is in a safe and stable condition. The flaw will be repaired prior to startup from the refueling outage. The flaw and repair have no impact on the health and safety of the public or station employees. The NRC Resident Inspector has been notified. The flaw is located on the J groove weld of Nozzle 40. No boric acid deposits were located near the nozzle.
Subsequent inspections identified an additional nozzle that will require repairs (Nozzle 51) prior to startup. Inspections continue and are expected to be completed by October 18. The additional inspection indication and repair have no impact on the health and safety of the public or station employees. The NRC Resident Inspector has been notified. The flaw is located on the J groove weld. No boric acid deposits were located near the nozzle. Notified R2DO(Ehrhardt).
Subsequent inspections identified an additional nozzle that will require repairs (Nozzle 30) prior to startup. Inspections continue and are expected to be completed by October 18. The additional inspection indication and repair have no impact on the health and safety of the public or station employees. The NRC Resident Inspector has been notified. Notified R2DO(Ehrhardt). |