ML15243A447

Master Report - Tables 1 and 2

ML15243A447
Person / Time
Site:	Salem
Issue date:	09/10/2015
From:	Quinn-Willingham L NRC/NRO/DSEA/RHMB
To:
Quinn-Willingham L
Shared Package
ML15244B266	List: ML15238B704 ML15243A447
References
TAC MF3790, TAC MF3791
Download: ML15243A447 (3)

Text

Salem, Units 1 and 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 Not included Not included Not included FHRR Section 1.2.1 in DB in DB in DB Streams and Rivers Not included Not included Not included FHRR Section 1.2.2 in DB in DB in DB Failure of Dams and Onsite Water Control/Storage Structures Not included Not included Not included FHRR Section 1.2.3 in DB in DB in DB Storm Surge Auxiliary Building 24.0 ft 6.6 ft 30.6 ft FHRR Section 1.2.4 NAVD88 NAVD88 Service Water Intake Structure 24.0 ft 13.5 ft 37.5 ft FHRR Section 1.2.4 and Table 3-1 NAVD88 NAVD88 Seiche No Impact No Impact No Impact FHRR Section 1.2.5 on the Site on the Site on the Site Identified Identified Identified Tsunami No Impact No Impact No Impact FHRR Section 1.2.6 on the Site on the Site on the Site Identified Identified Identified Ice-Induced Flooding No Impact No Impact No Impact FHRR Section 1.2.7 on the Site on the Site on the Site Identified Identified Identified

Salem, Units 1 and 2 Table 1. Current Design Basis Flood Hazards for Use in the MSA Mechanism Stillwater Waves/ Design Basis Reference Elevation Runup Hazard Elevation Channel Migrations/Diversions No Impact No Impact No Impact FHRR Section 1.2.8 on the Site on the Site on the Site Identified Identified Identified Note 1: Reported values are rounded to the nearest one-tenth of a foot.

Note 2: Based on the NRC staffs independent (deterministic) hazard assessment using present-day regulatory guidance and methodologies of storm surge, the staff concludes that the sites current design basis remains bounded. For this reason, the staff concludes it is appropriate to utilize the current design basis storm surge elevation in conjunction with the mitigating strategies assessment.

Salem, Units 1 and 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 12.2 ft Minimal 12.2 ft FHRR Section 3.1 NAVD88 NAVD88 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.