ML092380305

Slides for Closed Meeting Regarding External Flood Technical Meeting on August 27, 2009

ML092380305
Person / Time
Site:	Oconee
Issue date:	08/27/2009
From:	Duke Energy Carolinas
To:	Office of Nuclear Reactor Regulation
Stang, JF, NRR/DORL/LPD II-1, 415-1345
References
Download: ML092380305 (22)

Text

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

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 2 under 10 CFR 2.390

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 3 under 10 CFR 2.390

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 4 under 10 CFR 2.390

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 5 under 10 CFR 2.390

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 6 under 10 CFR 2.390

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 7 under 10 CFR 2.390

Variation in Jocassee Breach Parameters

~ Bottom Elevation

~ 750 ft. MSL

~ 800 ft. MSL 1125 Ft. MSL

~ 825 ft. MSL

~ 850 ft. MSL Piping Elev.

~ Bottom Width

~ 250 ft. Side Bottom Elev. \ / Slopes

~ 500 ft.

~ 600 ft. I I

~ 625 ft.

~ 650 ft. Bottom Width Withhold from public disclosure 8 under 10 CFR 2.390

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 9 under 10 CFR 2.390

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 10 under 10 CFR 2.390

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 11 under 10 CFR 2.390

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 12 under 10 CFR 2.390

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 13 under 10 CFR 2.390

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 14 under 10 CFR 2.390

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 15 under 10 CFR 2.390

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 16 under 10 CFR 2.390

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 17 under 10 CFR 2.390

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 18 under 10 CFR 2.390

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 19 under 10 CFR 2.390

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 20 under 10 CFR 2.390

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 21 under 10 CFR 2.390

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 22 under 10 CFR 2.390