20080915 Ver 1_Notice of Deviation Flow Requirements_20161118

rot
DUKE
ENERGY.
The Honorable Kimberly D. Bose, Secretary
Federal Energy Regulatory Commission
888 First Street, N,E.
Washington, DC 20426
WA TER S TRA TEG Y, H YDRO
LICENSING AND LAKE SERVICES
Duke Energy Corporation
526 South Church Street
Charlotte, NC 28.902
RE: ilotification of Deviation From Minimum Continuous Flow Requiremen
Catawba-Wateree Hydro Project P-2232
Bridgewater Development i
Duke Energy Carolinas, LLC (Duke Energy) is providing notification of a deviation from
the Minimum Continuous Flow requirement of the Federal Energy Regulatory
Commission (Commission) License for the Catawba-Wateree Hydro Project (Project)
issued November 25, 2015,
According to License Appendix E, Section A-2.0, the seasonal Minimum Continuous
Flow into the Bridgewater Tailrace for the August - November time period is 75 cubic feet
per second (cfs), as measured at the immediately downstream United States Geological
Survey (USGS) streamflow gaging station (No. 02138520).
On November 16, 2016, the technician at the Bridgewater station heard a loud noise
coming from Unit 3. The technician contacted the manufacturer and it was suggested to
have the Regulated Renewables Operations Center (RAli OC) shutdown the unit and have
the technician perform an inspection. Prior to shutting down the unit, the RROC
technician opened the ring jet valve to pass the required minimum continuous flow of 75
cfs. lFix, the program used for automatic controls for the hydro stations, was showing an
output of 91 cfs from the ring jet valve at an opening of 29 percent. This flow-to-openin!t
relationship is based on data provided by a consultant. The technician in the RROC then
proceeded to shutdown Unit 3.
it) I a I I AMR I A I W001 I I I I a 14 W; &-=

The Honorable Kimberly D. Bose, Secretary
November 16, 2016
Page 2
This incident revealed an inconsistency between the flow release information used in the
IFix system and the flow recorded by the downstream USGS gage. In February 2016,
Duke Energy performed a flow measurement calibration for ring jet valve flows. The
flows associated with the calibration were not in alignment with the flows represented on
the iFix screen. As a result of this event, the controls group will remove the existing flow
data from the iFix screen and replace it with a graphic that reflects actual field -calibrated
flows and the percent ring jet valve opening to achieve each flow.
in excess ot 75 cts prior to and tollowing this event helped mitigate tor flows during this
two-hour period. During this time there was no effect on Large Water Intake Owners or
Downstream Effluent Dischargers. No environmental effects were observed or are
considered likely. Duke Energy is notifying North Carolina agencies via copy of this
letter and requests their feedback if any agency believes further consultation is
necessary.
Sinc rely,
i to,
Jeffrey G. Lineberger, �PE
AROTOMM5
cc with Enclosure: 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
Lynne Dunn, Duke Energy
George Galleher, Duke Energy
Mark Oakley, Duke Energy
Phil Fragapane, Duke Energy
Keith Finley, Duke Energy
Garry Rice, Duke Energy
Shannon Todd, Duke Energy

MOTIrs
Values b0ow -the continuous minimurn flow req.Ar men are highlighted in red
Minimum
Flow (cfs)
(Cfs)
11/16/16 4:00 PM
145
75
11/16/16 4:15 PM
148
75
11/16/16 4:30 PM
145
75
11/16/16 4:45 PM
181
75
11/16/16 5:00 PM
193
75
11/16/16 5:15 PM
130
75
11/16/16 5:30 PM
69
75
11/16/16 5:45 PM
66
75
11/16/16 6:00 PM
66
75
11/16/16 6:15 PM
66
75
11/16/16 6:30 PM
66
75
11/16/16 6:45 PM
66
75
11/16/16 7:00 PM
66
75
11/16/16 7:15 PM
66
75
11/16/16 7:30 PM
66
75
11/16/16 7:45 PM
91
75
11/16/16 8:00 PM
89
75
11/16/16 8:15 PM
89
75
11/16/16 8:30 PM
89
75
11/16/16 8:45 PM
89
75
11/16/16 9:00 PM
89
75