ML23068A087

NRC-2022-000210 - Resp 1 - Final, Agency Records Subject to the Request Are Enclosed, (Part 2 of 4)

ML23068A087
Person / Time
Issue date:	03/01/2023
From:	NRC/OCIO
To:
Shared Package
ML23068A081	List: ML23068A082 ML23068A083 ML23068A085 ML23068A086 ML23068A087 ML23068A088
References
NRC-2022-000210
Download: ML23068A087 (1)

Text

Oconee, Units 1, 2, & 3 Table 1. Current Design Basis Flood Hazards for Use in the MSA I

Mechanism Stillwater Waves/

Design Basis Reference Elevation Runup Hazard Elevation Local Intense Precipitation Not included Not included Not included Staff Assessment in DB in DB in DB I

I Streams and Rivers I

I Flooding in Reservoirs - Keowee 808.0 ft MSL Not 808.0 ft MSL Staff Assessment Reservoir (not calculated at applicable Power Block)

I I

Failure of Dams and Onsite I

Water Control/Storage Structures Not included Not included Not included Staff Assessment in DB in DB in DB I

I Storm Surge I

I I

Not included Not included Not included Staff Assessment in DB in DB in DB I

I Seiche I

I Not included Not included Not included Staff Assessment in DB in DB in DB I

I Tsunami I

I Not included Not included Not included Staff Assessment in DB in DB in DB I

I Ice-Induced Flooding I

I I

Not included Not included Not included Staff Assessment in DB in DB in DB I

I Channel Migrations/Diversions I

I Not included Not included Not included Staff Assessment in DB in DB in DB j

I l

Note 1: Reported values are rounded to the nearest one-tenth of a foot.

Oconee, Units t, 2., & 3 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA I

Mechanism Stillwater Waves/

Reevaluated Reference Elevation Runup Hazard Elevation local Intense Precipitation 800.4 ft MSL Minimal 800.4 ft MSL FHRR Section 3.1 Streams and Rivers I

Streams and Rivers (Flooding in 808.9 ft MSL 3.3 ft 812.2 ft MSL FHRR Section 3.2 Reservoirs, Keowee)

I Failure of Dams and Onsite Water Control/Storage Structures

'b1C',:l6 (t-.1(] ):16 Jocassee Dam Breach - Sunny T.S.C § MSL Not llSC ~

MSL FHRR Section 3.3 Day Failure

~:'40-1111) applicable

~~fo-ld1 b*1* tfJ (bl( ~l(F

• Note 1: The licensee is expected to develop flood event duration parameters and applicable flood associated effects to conduct the MSA consistent with the guidance. The NRC staff has reviewed information related to flood event duration parameters (including warning time and period of inundation).

Note 2: Reevaluated hazard mechanisms bounded by the current design basis (see Table 1) are not included in this table.

Note 3: Reported values are rounded to the nearest one-tenth of a foot.

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