ML16349A175

Seabrook MSFHI - Tables 1 and 2--Final 12-21-16

ML16349A175
Person / Time
Site:	Seabrook
Issue date:	12/21/2016
From:	Bensi M T NRC/NRO/DSEA/RHMB
To:
Willingham M
References
Download: ML16349A175 (7)

Text

SeabrookStation,Unit1Table 1. Current Design Basis Flood Hazards for Use in the MSAMechanismStillwater Elevation Waves/ Runup ReferenceDesign Basis Hazard ElevationLocal Intense PrecipitationMaximum water surface elevation not crediting storm drainage system.19.9 ft NAVD88Minimal19.9 ft NAVD88FHRR Section 3.1Failure of Dams and Onsite Water Control/Storage StructuresNo Impact on the Site IdentifiedNo Impact on the Site IdentifiedNo Impact on the Site IdentifiedFHRR Section 3.3 and FHRR Table 5-1Streams and RiversPMP combined with tidal effectNo Impact on the Site IdentifiedNo Impact on the Site IdentifiedNo Impact on the Site IdentifiedFHRR Table 5-1, Note 1Storm SurgeSurge at Seawall14.8 ft NAVD8814.8 ft NAVD88FHRR Section 5.4 and FHRR Table 5-1Site ponding due to surge (waves overtopping seawall)20.2 ft NAVD88 0.8 ft21.0 ft NAVD88FHRR Section 5.4 and FHRR Table 5-1 SeicheNo Impact on the Site IdentifiedNo Impact on the Site IdentifiedNo Impact on the Site IdentifiedFHRR Table 5-1 TsunamiNo Impact on the Site IdentifiedNo Impact on the Site IdentifiedNo Impact on the Site IdentifiedFHRR Table 5-1Ice-Induced FloodingNo Impact on the Site IdentifiedNo Impact on the Site IdentifiedNo Impact on the Site IdentifiedFHRR Table 5-1 SeabrookStation,Unit1Table 1. Current Design Basis Flood Hazards for Use in the MSAMechanismStillwater Elevation Waves/ Runup ReferenceDesign Basis Hazard ElevationNote 1: Reported values are rounded to the nearest one-tenth of a foot.Channel Migrations/DiversionsNo Impact on the SIte IdentifiedNo Impact on the Site IdentifiedNo Impact on the Site IdentifiedFHRR Section 3.9Note 2: FHRR Section 5.4 (Surge) states that, with regard to the CLB "some minor overtopping is expected, with still water levels on the site not exceeding +20.23 ft-NAVD88 (+21.00 ft-Plant Datum). The overtopping could support minor wave activity that could conservatively result in a wave runup on building walls to +21.03 ft-NAVD88 (+21.8 ft-Plant Datum)."

SeabrookStation,Unit1Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSAMechanismStillwater Elevation Waves/ RunupReevaluated Hazard Elevation ReferenceLocal Intense Precipitation20.7 ft NAVD88Minimal20.7 ft NAVD88Table 4-3 of FHRRPump House/Site-specific PMP - Point of Interest (POI) 1221.8 ft NAVD88Minimal21.8 ft NAVD88Table 4-3 of FHRRContainment Units 1/Site-specific

PMP - POI 5920.6 ft NAVD88Minimal20.6 ft NAVD88Table 4-3 of FHRRTurbine Building/Site-specific

PMP - POI 5720.8 ft NAVD88Minimal20.8 ft NAVD88Table 4-3 of FHRRFuel Storage Building/Site-specific PMP - POI 1923.8 ft NAVD88Minimal23.8 ft NAVD88Table 4-3 of FHRRWaste Process Building/Site-specific PMP - POI 2520.9 ft NAVD88Minimal20.9 ft NAVD88Table 4-3 of FHRRAdministration Building/Site-specific PMP - POI 3620.3 ft NAVD88Minimal20.3 ft NAVD88Table 4-3 of FHRRCooling Tower/Site-specific PMP - POI 6925.1 ft NAVD88Minimal25.1 ft NAVD88Table 4-3 of FHRRDry Fuel Storage Pad/Site-specific PMP - POI 83Storm Surge17.8 ft NAVD88 5.6 ft23.4 ft NAVD88FHRR Table 5-1Seawall20.2 ft NAVD8820.2 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Intake Building (POI 1)

SeabrookStation,Unit1Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSAMechanismStillwater Elevation Waves/ RunupReevaluated Hazard Elevation Reference20.0 ft NAVD8820.0 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Pump House Building (POI 11)20.3 ft NAVD8820.3 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Pump House Building (POI 9, 10, 12 and 13)20.4 ft NAVD8820.4 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Pump House Building (POI 3 and 6)20.6 ft NAVD8820.6 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Pump House Building (POI 7 and

8)20.7 ft NAVD8820.7 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Pump House Building (POI 5 and 14)20.8 ft NAVD8820.8 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Pump House Building (POI 4)20.2 ft NAVD8820.2 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping (POI

15)20.3 ft NAVD8820.3 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Containment Unit 1 (POI 62)20.5 ft NAVD8820.5 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Containment Unit 1 (POI 16 and

17)20.6 ft NAVD8820.6 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Containment Unit 1 (POI 63)

SeabrookStation,Unit1Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSAMechanismStillwater Elevation Waves/ RunupReevaluated Hazard Elevation Reference20.8 ft NAVD8820.8 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Containment Unit 1 (POI 61)20.9 ft NAVD8820.9 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Containment Unit 1 (POI 60)21.0 ft NAVD8821.0 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Containment Unit 1 (POI 59)22.1 ft NAVD8822.1 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Containment Unit 1 (POI 18)20.2 ft NAVD8820.2 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Waste Process Building (POI 21)20.5 ft NAVD8820.5 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Waste Process Building (POI 22)20.6 ft NAVD8820.6 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Waste Process Building (POI 23)20.8 ft NAVD8820.8 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Waste Process Building (POI 27)21.0 ft NAVD8821.0 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Waste Process Building (POI 24)23.1 ft NAVD8823.1 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Waste Process Building (POI 26)

SeabrookStation,Unit1Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSAMechanismStillwater Elevation Waves/ RunupReevaluated Hazard Elevation Reference24.6 ft NAVD8824.6 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Waste Process Building (POI 25)20.2 ft NAVD8820.2 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Administration Building (POI 50)20.4 ft NAVD8820.4 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Administration Building (POI 49)20.5 ft NAVD8820.5 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Administration Building (POI 31

and 48)20.6 ft NAVD8820.6 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Administration Building (POI 28, 36, 37 and 51)20.7 ft NAVD8820.7 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Administration Building (POI 44, 45, 46 and 47)20.8 ft NAVD8820.8 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Administration Building (POI 35, 38 and 42)20.9 ft NAVD8820.9 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Administration Building (POI 32

and 39)21.0 ft NAVD8821.0 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Administration Building (POI 43)21.1 ft NAVD8821.1 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Administration Building (POI 33

and 41)

SeabrookStation,Unit1Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSAMechanismStillwater Elevation Waves/ RunupReevaluated Hazard Elevation Reference21.2 ft NAVD8821.2 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Administration Building (POI 40)21.3 ft NAVD8821.3 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Administration Building (POI 34)24.3 ft NAVD8824.3 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Administration Building (POI 30)20.4 ft NAVD8820.4 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Turbine Building (POI 58)20.5 ft NAVD8820.5 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Turbine Building (POI 53)20.6 ft NAVD8820.6 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Turbine Building (POI 52)20.3 ft NAVD8820.3 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Cooling Tower (POI 65 and 66)20.4 ft NAVD8820.4 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Cooling Tower (POI 64 and 72)20.6 ft NAVD8820.6 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Cooling Tower (POI 73)20.7 ft NAVD8820.7 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Cooling Tower (POI 74)

SeabrookStation,Unit1Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSAMechanismStillwater Elevation Waves/ RunupReevaluated Hazard Elevation Reference Note : Reevaluated hazard mechanisms bounded by the cu rrent design basis (se e Table 1) are not included in this table Note : Reported values a re rounded to the nearest o ne-tenth of a foot.20.8 ft NAVD8820.8 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Cooling Tower (POI 71 and 75)20.9 ft NAVD8820.9 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Cooling Tower (POI 67)21.0 ft NAVD8821.0 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Cooling Tower (POI 68 and 70)21.2 ft NAVD8821.2 ft NAVD88FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9Surge+Wave Overtopping at Cooling Tower (POI 69)

Note 3: Storm surge elevations at locations othe r th an the seawall reflec t water elevations on the site a s a result of waves overtopping the seawall and water flo wing across the site.

Staff a dded the resulting overtopping depths (FHRR Table 4-41) and ground elevations to com pute the st illwater elevations at t he POIs assoc iated with sit e buildings as shown in FH RR Figure 4-9 and FHRR Figure 4-10. The PMSS ponding level (given as the wave-overtopping effected stillwater elevation in this table) exceeds that of the CDB. The licensee stated that the reevaluated wave runup o n building walls can be expected to be somewhat more than that described in the CDB (FHRR Section 5.4).

Note: To develop storm surge elevations at locations other than the seawall, staff sorted and grouped the s tillwater elevation values by site building and then by stillwater elevation value. Staff developed table scenarios based on site building and stillwaver elevation groups at no finer than 0.1-ft increments .

Note: With respect to storm surge elevations at location s other than the seawall, the licensee stated in FHRR Table 4-3 that "it is apparent that t he s tated WSEL for POI 30 i s not the general surface elevation of the floodwater in that location, particularly give n th e minimal flood depth. Local topography and nearby POIs 31 and 32 should be referenced to determine a reasonable, conservative flooding level for this point."

Note: With respect to storm surge elevations at location s other than the seawall, the licensee stated in FHRR Table 4-41 that "POI 29 is located on top of t he RHR vault roof; therefore, f lood depths do not accumulate becaus e t he RHR Vault roof is higher than the m aximum flood water l evels in the area." The licensee does n ot provide the definition of RHR wit hin the FHRR.

Note: Values reported fo r local intense precipit ation are representative values fo r eac h b uilding