A number of incidents were reported to the Nuclear Regulatory Commission this morning:
1. Saturday morning, an Xcel Power environmental specialist reported approximately 100 dead fish downstream from the Monticello nuclear plant in Minnesota. Atypically, the fish were killed by a sudden discharge of cooler water, according to the report submitted to the NRC:
“Fish kill was the result of cooldown of water being discharged to the river from the plant’s discharge canal.”
The discharge followed a reactor shutdown, but the report does not inicate if the shutdown was a planned outage or a scram.
2. Both the Nine Mile Point nuclear plant and the FitPatrick plant reported that an Oswego County emergency siren had sounded Saturday night, causing a warning to sound in the plants’ control rooms. Technicians were dispatched to disconnect the siren. Both facilities say the alarm was invalid, and investigation of the cause continues.
3. The Turkey Point Unit 3 reactor had to be manually scrammed Sunday evening following the discovery of elevated levels of sodium in the steam generator. This resulted in activation of the Reactor Protection System. The reactor is currently in Hot Standby mode while the cause of the increased sodium level is investigated.