ML15226A525

HAhn_8-13-2015

ML15226A525
Person / Time
Site:	McGuire
Issue date:	09/03/2015
From:	Hosung Ahn NRC/NRO/DSEA/RHMB
To:
Ahn H
Shared Package
ML15230A161	List: ML15226A525 ML15230A070
References
TAC MF3623, TAC MF3624
Download: ML15226A525 (3)

Text

McGuire, Units 1 & 2 Table 1. Current Design Basis Flood Hazards for Use in the MSA Mechanism Stillwater Waves/ Design Basis Reference Elevation Runup Hazard Elevation Local Intense Precipitation 760.4 ft msl 0.0 ft 760.4 ft msl FHRR Section 1.2.1 Streams and Rivers Reservoir Level at Cowans 767.9 ft msl 5.1 ft 773.0 ft msl FHRR Section 1.2.2 Ford Dam FHRR Section 1.2.8 (Table 1.2.8-1)

Failure of Dams and Onsite Water Control/Storage Structures Upstream Dam Failures 762.6 ft msl 5.1 ft 767.7 ft msl FHRR Section 1.2.3 (combined event) FHRR Section 1.2.3 (Table 1.2.8-1)

Standby Nuclear Service Water 746.9 ft msl 1.5 ft 748.4 ft msl FHRR Table 3-1 Pond (combined event)

Standby Nuclear Service Water 727.8 ft msl Not 727.8 ft msl FHRR Table 3-1 Pond Dam Downstream applicable (combined event)

Storm Surge Surge in Lake Norman 760.0 ft msl 14.8 ft 774.8 ft msl FHRR Section 1.2.4 Seiche No Impact No Impact No Impact FHRR Section 1.2.4 on the Site on the Site on the Site Identified Identified Identified Tsunami Not included Not included Not included FHRR Section 1.2 in DB in DB in DB

McGuire, Units 1 & 2 Table 1. Current Design Basis Flood Hazards for Use in the MSA Mechanism Stillwater Waves/ Design Basis Reference Elevation Runup Hazard Elevation Ice-Induced Flooding Not included Not included Not included FHRR Section 1.2 in DB in DB in DB Channel Migrations/Diversions Not included Not included Not included FHRR Section 1.2 in DB in DB in DB Note 1: Reported values are rounded to the nearest one-tenth of a foot.

Note 2: The wave hieght value of 5.1 ft for the Streams and Rivers, and Upstream Dam Failures (combined event) is wave setup plus runup.

McGuire, Units 1 & 2 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism Stillwater Waves/ Reevaluated Reference Elevation Runup Hazard Elevation Local Intense Precipitation 761.1 ft msl Minimal 761.1 ft msl FHRR Section 2.1 Streams and Rivers River PMF in Lake Norman 777.9 ft msl Not 777.9 ft msl FHRR Section 2.2 and 2.8 applicable Failure of Dams and Onsite Water Control/Storage Structures Upstream Dam Failures 778.5 ft msl Not 778.5 ft msl FHRR Section 2.3 and 2.8 (combined event) applicable Standby Nuclear Service Water 735.9 ft msl 0.9 ft 736.8 ft msl FHRR Tables 2.4.2-1 and 2.4.2-2 Pond Dam Downstream (combined event)

Storm Surge 778.5 ft msl 0.0 ft 778.5 ft msl FHRR Table 3-1 FHRR Section 2.4.1 (Table 2.4.1-1)

Note 1: The licensee is expected to develop flood event duration parameters and applicable flood associated effects to conduct the MSA. The staff will evaluate the flood event duration parameters (including warning time and period of inundation) and flood associated effects during its review of the MSA.

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.