20080915 Ver 1_Advance Notification of Repairs_20161118

(� DUKE
ENERGY.
November 18, 2016
The Honorable Kimberly D. Bose, Secretary
Federal Energy Regulatory Commission
888 First Street, N.E.
Washington, DC 20426
RE: Advance Notification of Hydroelectric Unit Repairs
Lookout Shoals Development
Catawba-Wateree Hydro Project P-2232
Dear Secretary Bose:
WATER STRATEGY, HYDRO
LICENSING AND LAKE SERVICES
Duke Energy Corporation
528 South Church Street
Charlotte, NC 28202
Duke Energy Carolinas, LLC (Duke Energy) is providing this submittal to the Federal Energy
Regulatory Commission (Commission) in accordance with the Maintenance and Emergency
Protocol of the Catawba-Wateree Project (Project) license issued November 25, 2015.
Specifically, this submittal provides advance notification of required Maintenance of the Normal
Means of Providing Minimum Flow (Scheduled) under MEP Condition B.1.
This maintenance is to modify and repair the continuous minimum flow units, known as Junior
Units A and B, at the Lookout Shoals Development to improve their reliability, repair trash
racks, and improve dissolved oxygen in the water released from these minimum flow units.
Duke Energy needs to take Junior Unit A out of service to repair bearings that are worn
and allow excessive vibration.
Duke Energy is going to seal intake gates leading to the junior units to block the intake
of low -dissolved oxygen from lower reservoir depths and increase the intake of higher
dissolved oxygen water from higher reservoir elevations. This will improve of Duke
Energy's ability to consistently comply with dissolved oxygen standards.
Trash rack supports on the intake side of the junior units need to be repaired.
This work will require a partial station shutdown beginning December 5 and targeted to end on
December 23. These projects require divers to work in the forebay to perform the junior
generator trash rack support repairs and intake gate sealing. Both junior generators must be
shut down during diving periods for diver safety. During the outage, Duke Energy will make the
following flow releases:
• The Lookout Shoals leakage flow was recently confirmed to be approximately 53 cfs
(refer to Duke Energy's November 2, 2016 filing with the Commission regarding
Completed Assessment of Generation Scenario Flows and Outline of Project
Compliance Tool Enhancements for the Lookout Shoals Development, Commission
Docket No. P-2232-631).

Ms. Kimberly D. Bose
November 18, 2016
Page 2 of 2
• Duke Energy will pulse one large unit for 1 hour at 6 MW's twice per day which will
provide a daily average flow of approximately 90 cfs.
• When unit pulsing and the measured leakage are combined, tailrace flow should
average 90 cfs on a daily basis and not fall below approximately 53 cfs.
This approach will have no effect on Large Water Intake Owners or Downstream Effluent
Dischargers. No environmental effects are expected. Duke Energy is notifying North Carolina
agencies via copy of this letter and requests their feedback if any agency believes further
consultation is necessary.
Please direct questions to Mark Oakley at [phone] ([e-mail]).
Sincerely,
4
Jeffrey G. Lineberger, PE
Director, Water Strategy & Hydro Licensing
Duke Energy Carolinas, LLC
cc: Karen Higgins, NC Department of Environmental Quality
Fred Tarver, NC Department of Environmental Quality
Chris Goudreau, NC Wildlife Resources Commission
Bryan Tompkins, US Fish and Wildlife Service
Randy Herrin, Duke Energy
Greg Lewis, Duke Energy
Mark Oakley, Duke Energy
Phil Fragapane, Duke Energy
Keith Finley, Duke Energy
Garry Rice, Duke Energy