ML092380305

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(Redacted) Oconee, Slides for Closed Meeting Regarding External Flood Technical Meeting on August 27, 2009
ML092380305
Person / Time
Site: Oconee  Duke Energy icon.png
Issue date: 08/27/2009
From:
Duke Energy Carolinas
To:
Office of Nuclear Reactor Regulation
Stang, JF, NRR/DORL/LPD II-1, 415-1345
Shared Package
Property Cell - ML24311A143 List:
References
Download: ML092380305 (22)
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Text

Oconee Nuclear Station External Flood Technical Meeting Rockville, MD August 27, 2009 Withhold from public disclosure under 10 CFR 2.390 1

Duke Attendees

~ Jeff Thomas, Corporate Regulatory Compliance Manager

~ Tim Brown, ONS Project Manager

~ Ray Mc Coy, ONS Principal Engineer

~ Chris Ey, Principal Engineer HDR

~ Tim Banta, Senior Engineer HDR Withhold from public disclosure under 10 CFR 2.390 2

Agenda

~Opening Remarks

~Key Input Parameters

~Identification of Parameters Varied

~ Identification of Parameters Not Varied

~Variation of Identified Parameters

~Justification for Identified Parameters and their Variation

~Overview of 1D & 2D models

~ Technical Question / Answer Session Withhold from public disclosure under 10 CFR 2.390 3

Key Parameters

~ Jocassee Breach Parameters

~ Bottom Elevation

~ Bottom Width

~ Side Slopes

~ Piping Elevation

~ Time to Failure

~ Failure Progression

~ Channel Flow Parameters

~ Manning's n Withhold from public disclosure under 10 CFR 2.390 4

Key Parameters

~ Keowee Breach Parameters

~ Location

~ Size

~ Side Slopes

~ Overtopping Failure Trigger

~ Time to Failure:

~ Main Dam

~ ONS Intake Canal Dike

~ Little River Dam Withhold from public disclosure under 10 CFR 2.390 5

Parameters Not Varied

~ Jocassee Breach Parameters

~ Reservoir Elevation

~ Base case - 1108 ft. MSL (1992 EAP)

~ All other cases - 1110 ft. MSL

~ No concurrent PMF

~ Keowee Breach Parameters

~ Reservoir Elevation - 800 ft. MSL

~ No concurrent PMF

~ West Saddle Dike Breach Size

~ Bottom Breach Elevation - 795 ft. MSL

~ Top Breach Length - 1680 ft.

~ Overtopping Trigger Elevation - 817 ft. MSL

~ Time to Failure -.5 hrs.

Withhold from public disclosure under 10 CFR 2.390 6

Parameters Not Varied

~ Oconee Intake Canal Dike

~ Bottom Breach Elevation - 715.5 ft. MSL

~ Bottom Width - 200 ft.

~ Side Slopes - 1:1

~ Overtopping Trigger Elevation - 817 ft. MSL

~ Failure Progression - Sine Wave

~ Little River Dam

~ Bottom Breach Elevation - 670 ft. MSL

~ Bottom Width - 290 ft.

~ Side Slopes - 1:1

~ Overtopping Trigger Elevation - 817 ft. MSL

~ Failure Progression - Sine Wave Withhold from public disclosure under 10 CFR 2.390 7

Variation in Jocassee Breach Parameters

~ Bottom Elevation

~ 750 ft. MSL 1125 Ft. MSL

~ 800 ft. MSL

~ 825 ft. MSL

~ 850 ft. MSL Piping Elev.

~ Bottom Width Side

~ 250 ft.

Bottom Elev.

\\

/

Slopes

~ 500 ft.

~ 600 ft.

I I

~ 625 ft.

Bottom Width

~ 650 ft.

Withhold from public disclosure under 10 CFR 2.390 8

Variation in Jocassee Breach Parameters I cont.

~ Side Slopes

~.9:1 (both)

~ 1:1 (both)

~ 1.5:1 (both)

~ 1.55:1 (West Side),.7:1 (East Side)

~ 1.55:1 (West Side), 1:1 (East Side)

~ Piping Elevation

~ 940 ft. MSL

~ 1020 ft. MSL Withhold from public disclosure under 10 CFR 2.390 9

Variation

~ Jocassee Breach Parameters I cont.

~ Time to Failure

~ 1 hr.

~ 2 hr.

~ 3 hr.

~ 4 hr.

~ 5 hr

~ Failure Progression

~ Linear

~ Sine Wave Withhold from public disclosure under 10 CFR 2.390 10

Computed Jocassee Parameters Jocassee Breach Parameters: Average Breach Width

~ 575 ft. (1992 EAP)

~ 900 ft.

~ 625 ft.

~ 914.4 ft.

~ 770 ft.

~ 925 ft.

~ 792.5 ft.

~ 950 ft.

~ 800 ft.

~ 965.6 ft.

~ 825 ft.

~ 987.5 ft.

~ 875 ft.

~ 1014.4 ft.

~ 865.6 ft.

~ 1087.5

~ 882.5 ft.

Withhold from public disclosure under 10 CFR 2.390 11

Computed Jocassee Parameters Jocassee Breach Parameters: Top Breach Width

~ 900 ft. (1992 EAP)

~ 1265 ft.

~ 1000 ft.

~ 1329 ft.

~ 1040 ft.

~ 1331 ft.

~ 1085 ft.

~ 1400 ft.

~ 11 00 ft.

~ 1429 ft.

~ 1150 ft.

~ 1475 ft.

~ 1200 ft.

~ 1575 ft.

~ 1231 ft.

Withhold from public disclosure under 10 CFR 2.390 12

Variation in Keowee Breach Parameters

~ Location

~ Main Dam (Small Breach)

~ Bottom Elevation 670 & 700 ft. MSL

~ Bottom Width 500 & 650 ft.

~ Side slopes 1:1 (both)

~ Main Dam (Large Breach)

~ Bottom Elevation 670 ft. MSL

~ Bottom Width 500 ft.

~ Side Slopes 3.45:1 (West), 2.03:1 (East)

~ w. Saddle Dike Breach Size:

~ Bottom Elevation 795 ft. MSL

~ Length 1680 ft.

Withhold from public disclosure under 10 CFR 2.390 13

Variation in Keowee Breach Parameters I cant.

~ Overtopping Failure Trigger (Keowee Main Dam)

~.5 ft.

~ 2 ft.

~ Time to Failure

~ Main Dam

~ Oconee Intake Dike

~ 2 hrs.

~ 1 hr.

~ 2.4 hrs.

~ 1.2 hrs.

~ 4 hrs.

~ 2 hrs.

~ Little River Dam

~ 1 hr.

~ 2.4 hrs.

~ 4 hrs Withhold from public disclosure under 10 CFR 2.390 14

Computed Keowee Parameters

~ Average Breach Width

~ 615ft.

~ 645 ft.

~ 765 ft.

~ 897.3 ft.

~ Top Breach Width

~ 790 ft.

~ 880 ft.

~ 1295 ft.

Withhold from public disclosure under 10 CFR 2.390 15

Variation in Channel Flow

~ Channel Flow Parameters

~ Manning's 'n'

~ Main Channel (Upstream of Keowee)

~.02

~.025

~.035

~ Keowee Tailrace

~.035

~.07, followed by transition from.07 to.02 Withhold from public disclosure under 10 CFR 2.390 16

Variation Justification

~ Jocassee

~ Froehlich

~ Bottom Breach Width: 725 ft. (maximum site constraint 600 ft.)

~ Side Slopes: 0.7: 1

~ Average Breach Width: 918 ft.

~ Top Breach Width: 1110 ft.

~ Time to Failure (Mean) 2.6 hrs.

~ Time to Failure (950/0 Confidence Interval): 1.7 - 7.1 hrs.

~ Breach Discharge (Mean) 2.7 mcfs

~ Breach Discharge (950/0 Confidence Interval):.94 - 7.4 mcfs Withhold from public disclosure under 10 CFR 2.390 17

Variation Justification

~ Jocassee

~ Walder & O'Connor

~ Time to Failure (Mean) 3.04 hrs.

~ Breach Discharge (95°Jb Confidence Interval): 7.12 mcfs

~ MacDonald-Langridge Monopolis

~ Time to Failure (Mean): 5.92 hrs.

~ Breach Discharge (Mean): 1.52 mcfs

~ Breach Discharge (95% Confidence Interval): 5.26 mcfs Withhold from public disclosure under 10 CFR 2.390 18

Variation Justification

~ Keowee

~ Froehlich

~ Bottom Breach Width: 1028 ft. (maximum site constraint 500 ft.)

~ Side Slopes: 1:1

~ Average Breach Width: 1173 ft.

~ Top Breach Width: 1318 ft.

~ Time to Failure (95% Confidence Interval): 2.4 - 2.8 hrs.

~ Breach Discharge (Mean) 1.2 mcfs

~ Breach Discharge (95% Confidence Interval):.44 - 3.4 mcfs Withhold from public disclosure under 10 CFR 2.390 19

Variation Justification

~ Keowee

~ Walder & O'Connor

~ Time to Failure (Mean): 1.3 hrs.

~ Time to Failure (95% Confidence Interval): 1.5 - 6.2 hrs.

~ Breach Discharge (Mean) 2.3 mcfs

~ MacDonald-Langridge Monopolis

~ Time to Failure (Mean): 4.6 hrs.

~ Time to Failure (950/0 Confidence Interval): 1.7 - 7.3 hrs.

~ Breach Discharge (Mean): 1.1 mcfs Withhold from public disclosure under 10 CFR 2.390 20

Variation Justification

~ Oconee Intake Dike

~ Froehlich

~ Bottom Breach Width: 1036 ft.

~ Side Slopes: 1:1

~ Average Breach Width: 1161 ft.

~ Top Breach Width: 1286 ft.

~ Time to Failure (95% Confidence Interval): 1.1 - 1.5 hrs.

~ Breach Discharge (Mean) 1.1 mcfs

~ Breach Discharge (95% Confidence Interval):.36 - 2.8 mcfs Withhold from public disclosure under 10 CFR 2.390 21

Variation Justification

~ Oconee Intake Dike

~ Walder & O'Connor

~ Time to Failure (Mean): 1.3 hrs.

~ Time to Failure (95% Confidence Interval):.7 - 2.8 hrs.

~ Breach Discharge (Mean) 1.9 mcfs

~ MacDonald-Langridge Monopolis

~ Time to Failure (Mean): 4.5 hrs.

~ Time to Failure (95°Jb Confidence Interval):.9 - 3.8 hrs.

~ Breach Discharge (Mean): 3.6 mcfs Withhold from public disclosure under 10 CFR 2.390 22

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