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Duke Energy Scientific Services group repr … Duke Energy Scientific Services group representative notified the NC Wildlife Resources Commission at 1555 hours that MNS was operating their LLI Pumps to maintain discharge temperatures within the NPDES permit average monthly temperature limit.</br>Based on the elevated lake temperatures, action to align circulating water to the LLI (cooler water) is necessary to prevent exceeding discharge temperature limits. Operation of the LLI pumps is sometimes needed during this time of year to comply with the water permit. Substantial effort is taken to avoid this alignment due to the potential to accelerate the natural phenomenon of oxygen depletion in the lower depths of Lake Norman that occurs as water temperature increases. The normal seasonal oxygen level changes can stress the fish population in that depth of the lake.</br>During the operation of the LLI pumps, Duke Energy's Scientific Services group monitors water quality and fish in the lake via the following activities,</br>1) Hydro acoustic surveys of the Cowan's Ford Dam fore-bay both immediate to the dam and also an approximate 2 mile run up the Catawba River channel.</br>2) Monitoring of fish behavior in the immediate vicinity of the LLI. A DIDSON camera sits atop the LLI (25 meter deep).</br>3) Water quality monitoring including dissolved oxygen and temperature profiles at every meter to the bottom of the lake. These profiles occur in the fore-bay and at multiple locations up the channel.</br>4) Hourly MNS discharge temperature monitoring.</br>These activities will continue to be exercised until the LLI pumps are turned off or the natural cycle of oxygen depletion has ended.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
19:55:00, 20 July 2011 +
47,078 +
17:30:00, 20 July 2011 +
19:55:00, 20 July 2011 +
Duke Energy Scientific Services group repr … Duke Energy Scientific Services group representative notified the NC Wildlife Resources Commission at 1555 hours that MNS was operating their LLI Pumps to maintain discharge temperatures within the NPDES permit average monthly temperature limit.</br>Based on the elevated lake temperatures, action to align circulating water to the LLI (cooler water) is necessary to prevent exceeding discharge temperature limits. Operation of the LLI pumps is sometimes needed during this time of year to comply with the water permit. Substantial effort is taken to avoid this alignment due to the potential to accelerate the natural phenomenon of oxygen depletion in the lower depths of Lake Norman that occurs as water temperature increases. The normal seasonal oxygen level changes can stress the fish population in that depth of the lake.</br>During the operation of the LLI pumps, Duke Energy's Scientific Services group monitors water quality and fish in the lake via the following activities,</br>1) Hydro acoustic surveys of the Cowan's Ford Dam fore-bay both immediate to the dam and also an approximate 2 mile run up the Catawba River channel.</br>2) Monitoring of fish behavior in the immediate vicinity of the LLI. A DIDSON camera sits atop the LLI (25 meter deep).</br>3) Water quality monitoring including dissolved oxygen and temperature profiles at every meter to the bottom of the lake. These profiles occur in the fore-bay and at multiple locations up the channel.</br>4) Hourly MNS discharge temperature monitoring.</br>These activities will continue to be exercised until the LLI pumps are turned off or the natural cycle of oxygen depletion has ended.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
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100 +
00:00:00, 20 July 2011 +
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02:06:34, 2 March 2018 +
17:30:00, 20 July 2011 +
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19:55:00, 20 July 2011 +
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