ML15268A298

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Interim Staff Response Enclosuflooding Tables 1 and 2
ML15268A298
Person / Time
Site: Catawba  Duke Energy icon.png
Issue date: 10/05/2015
From:
NRC/NRO/DSEA/RHMB
To:
Quinn-Willingham L
Shared Package
ML15278A028 List:
References
Download: ML15268A298 (3)


Text

Catawba, 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 Unit 1 Side of the Yard 594.7 ft msl Minimal 594.7 ft msl Response to NRC Request for Additional Information Regarding the FHRR, dated July 28, 2015 (ADAMS Accession No. ML15222A535)

Unit 2 Side of the Yard 594.7 ft msl Minimal 594.7 ft msl Response to NRC Request for Additional Information Regarding the FHRR, dated July 28, 2015 (ADAMS Accession No. ML15222A535)

Streams and Rivers Lake Wylie CNS Intake 581.1 ft msl Not 581.1 ft msl FHRR Section 1.2.2 and Table 3-1 applicable Standby Nuclear Service Water 583.5 ft msl 1.0 ft 584.5 ft msl FHRR Section 1.2.2 Pond Dam Failure of Dams and Onsite Water Control/Storage Structures Lake Wylie CNS Intake 592.4 ft msl 1.5 ft 593.9 ft msl FHRR Table 1.2.8-1 (Combined Effects)

Standby Nuclear Service Water 592.4 ft msl 2.2 ft 594.6 ft msl FHRR Table 1.2.8-1 Pond (Combined Effects)

Allison Creek CNS Discharge 592.4 ft msl 1.2 ft 593.6 ft msl FHRR Table 1.2.8-1 (Combined Effects)

Storm Surge Lake Wylie Storm Surge and 569.4 ft msl 8.4 ft 577.8 ft msl FHRR Section 1.2.4 Seiche

Catawba, 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 Seiche No Impact No Impact No Impact FHRR Section 1.2 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 Ice-Induced Flooding No Impact No Impact No Impact FHRR Section 1.2 on the Site on the Site on the Site Identified Identified Identified Channel Migrations/Diversions No Impact No Impact No Impact FHRR Section 1.2 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.

Catawba, 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 Unit 1 Side of the Yard 595.5 ft msl Minimal 595.5 ft msl FHRR Section 2.1 and Table 3-1 Unit 2 Side of the Yard 595.6 ft msl Minimal 595.6 ft msl FHRR Section 2.1 Streams and Rivers Lake Wylie CNS Intake 590.7 ft msl Not 590.7 ft msl FHRR Section 2.2.2 applicable Standby Nuclear Service Water 583.0 ft msl 0.8 ft 583.8 ft msl FHRR Section 2.4.1 and Table 2.4.3-1 Pond Dam (LIP)

Failure of Dams and Onsite Water Control/Storage Structures Lake Wylie CNS Intake 602.2 ft msl 1.0 ft 603.2 ft msl FHRR Section 2.8.1, Table 3-1, and (Combined Effects) Table 2.8.1-1 Standby Nuclear Service Water 602.2 ft msl 1.0 ft 603.2 ft msl FHRR Table 2.4.2-1 and Table 3-1 Pond (Combined Effects)

FHRR Table 2.8.1-1 Allison Creek CNS Discharge 599.8 ft msl Not 599.8 ft msl FHRR Table 2.3.2-4 and Table 3-1 (Combined Effects) applicable 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.