ML16349A175
| ML16349A175 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 12/21/2016 |
| From: | Bensi M NRC/NRO/DSEA/RHMB |
| To: | |
| Willingham M | |
| References | |
| Download: ML16349A175 (7) | |
Text
SeabrookStation,Unit1 Table 1. Current Design Basis Flood Hazards for Use in the MSA Mechanism Stillwater Elevation Waves/
Runup Reference Design Basis Hazard Elevation Local Intense Precipitation Maximum water surface elevation not crediting storm drainage system.
19.9 ft NAVD88 Minimal 19.9 ft NAVD88 FHRR Section 3.1 Failure of Dams and Onsite Water Control/Storage Structures No Impact on the Site Identified No Impact on the Site Identified No Impact on the Site Identified FHRR Section 3.3 and FHRR Table 5-1 Streams and Rivers PMP combined with tidal effect No Impact on the Site Identified No Impact on the Site Identified No Impact on the Site Identified FHRR Table 5-1, Note 1 Storm Surge Surge at Seawall 14.8 ft NAVD88 Minimal 14.8 ft NAVD88 FHRR Section 5.4 and FHRR Table 5-1 Site ponding due to surge (waves overtopping seawall) 20.2 ft NAVD88 0.8 ft 21.0 ft NAVD88 FHRR Section 5.4 and FHRR Table 5-1 Seiche No Impact on the Site Identified No Impact on the Site Identified No Impact on the Site Identified FHRR Table 5-1 Tsunami No Impact on the Site Identified No Impact on the Site Identified No Impact on the Site Identified FHRR Table 5-1 Ice-Induced Flooding No Impact on the Site Identified No Impact on the Site Identified No Impact on the Site Identified FHRR Table 5-1
SeabrookStation,Unit1 Table 1. Current Design Basis Flood Hazards for Use in the MSA Mechanism Stillwater Elevation Waves/
Runup Reference Design Basis Hazard Elevation Note 1: Reported values are rounded to the nearest one-tenth of a foot.
Channel Migrations/Diversions No Impact on the SIte Identified No Impact on the Site Identified No Impact on the Site Identified FHRR Section 3.9 Note 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,Unit1 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism Stillwater Elevation Waves/
Runup Reevaluated Hazard Elevation Reference Local Intense Precipitation 20.7 ft NAVD88 Minimal 20.7 ft NAVD88 Table 4-3 of FHRR Pump House/Site-specific PMP -
Point of Interest (POI) 12 21.8 ft NAVD88 Minimal 21.8 ft NAVD88 Table 4-3 of FHRR Containment Units 1/Site-specific PMP - POI 59 20.6 ft NAVD88 Minimal 20.6 ft NAVD88 Table 4-3 of FHRR Turbine Building/Site-specific PMP - POI 57 20.8 ft NAVD88 Minimal 20.8 ft NAVD88 Table 4-3 of FHRR Fuel Storage Building/Site-specific PMP - POI 19 23.8 ft NAVD88 Minimal 23.8 ft NAVD88 Table 4-3 of FHRR Waste Process Building/Site-specific PMP - POI 25 20.9 ft NAVD88 Minimal 20.9 ft NAVD88 Table 4-3 of FHRR Administration Building/Site-specific PMP - POI 36 20.3 ft NAVD88 Minimal 20.3 ft NAVD88 Table 4-3 of FHRR Cooling Tower/Site-specific PMP - POI 69 25.1 ft NAVD88 Minimal 25.1 ft NAVD88 Table 4-3 of FHRR Dry Fuel Storage Pad/Site-specific PMP - POI 83 Storm Surge 17.8 ft NAVD88 5.6 ft 23.4 ft NAVD88 FHRR Table 5-1 Seawall 20.2 ft NAVD88 Minimal 20.2 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Intake Building (POI 1)
SeabrookStation,Unit1 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism Stillwater Elevation Waves/
Runup Reevaluated Hazard Elevation Reference 20.0 ft NAVD88 Minimal 20.0 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Pump House Building (POI 11) 20.3 ft NAVD88 Minimal 20.3 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Pump House Building (POI 9, 10, 12 and 13) 20.4 ft NAVD88 Minimal 20.4 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Pump House Building (POI 3 and 6) 20.6 ft NAVD88 Minimal 20.6 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Pump House Building (POI 7 and 8) 20.7 ft NAVD88 Minimal 20.7 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Pump House Building (POI 5 and 14) 20.8 ft NAVD88 Minimal 20.8 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Pump House Building (POI 4) 20.2 ft NAVD88 Minimal 20.2 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping (POI 15) 20.3 ft NAVD88 Minimal 20.3 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Containment Unit 1 (POI 62) 20.5 ft NAVD88 Minimal 20.5 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Containment Unit 1 (POI 16 and 17) 20.6 ft NAVD88 Minimal 20.6 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Containment Unit 1 (POI 63)
SeabrookStation,Unit1 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism Stillwater Elevation Waves/
Runup Reevaluated Hazard Elevation Reference 20.8 ft NAVD88 Minimal 20.8 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Containment Unit 1 (POI 61) 20.9 ft NAVD88 Minimal 20.9 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Containment Unit 1 (POI 60) 21.0 ft NAVD88 Minimal 21.0 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Containment Unit 1 (POI 59) 22.1 ft NAVD88 Minimal 22.1 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Containment Unit 1 (POI 18) 20.2 ft NAVD88 Minimal 20.2 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Waste Process Building (POI 21) 20.5 ft NAVD88 Minimal 20.5 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Waste Process Building (POI 22) 20.6 ft NAVD88 Minimal 20.6 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Waste Process Building (POI 23) 20.8 ft NAVD88 Minimal 20.8 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Waste Process Building (POI 27) 21.0 ft NAVD88 Minimal 21.0 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Waste Process Building (POI 24) 23.1 ft NAVD88 Minimal 23.1 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Waste Process Building (POI 26)
SeabrookStation,Unit1 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism Stillwater Elevation Waves/
Runup Reevaluated Hazard Elevation Reference 24.6 ft NAVD88 Minimal 24.6 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Waste Process Building (POI 25) 20.2 ft NAVD88 Minimal 20.2 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Administration Building (POI 50) 20.4 ft NAVD88 Minimal 20.4 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Administration Building (POI 49) 20.5 ft NAVD88 Minimal 20.5 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Administration Building (POI 31 and 48) 20.6 ft NAVD88 Minimal 20.6 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Administration Building (POI 28, 36, 37 and 51) 20.7 ft NAVD88 Minimal 20.7 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Administration Building (POI 44, 45, 46 and 47) 20.8 ft NAVD88 Minimal 20.8 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Administration Building (POI 35, 38 and 42) 20.9 ft NAVD88 Minimal 20.9 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Administration Building (POI 32 and 39) 21.0 ft NAVD88 Minimal 21.0 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Administration Building (POI 43) 21.1 ft NAVD88 Minimal 21.1 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Administration Building (POI 33 and 41)
SeabrookStation,Unit1 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism Stillwater Elevation Waves/
Runup Reevaluated Hazard Elevation Reference 21.2 ft NAVD88 Minimal 21.2 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Administration Building (POI 40) 21.3 ft NAVD88 Minimal 21.3 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Administration Building (POI 34) 24.3 ft NAVD88 Minimal 24.3 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Administration Building (POI 30) 20.4 ft NAVD88 Minimal 20.4 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Turbine Building (POI 58) 20.5 ft NAVD88 Minimal 20.5 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Turbine Building (POI 53) 20.6 ft NAVD88 Minimal 20.6 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Turbine Building (POI 52) 20.3 ft NAVD88 Minimal 20.3 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Cooling Tower (POI 65 and 66) 20.4 ft NAVD88 Minimal 20.4 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Cooling Tower (POI 64 and 72) 20.6 ft NAVD88 Minimal 20.6 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Cooling Tower (POI 73) 20.7 ft NAVD88 Minimal 20.7 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Cooling Tower (POI 74)
SeabrookStation,Unit1 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism Stillwater Elevation Waves/
Runup Reevaluated Hazard Elevation Reference Note 1: Reevaluated hazard mechanisms bounded by the current design basis (see Table 1) are not included in this table Note 2: Reported values are rounded to the nearest one-tenth of a foot.
20.8 ft NAVD88 Minimal 20.8 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Cooling Tower (POI 71 and 75) 20.9 ft NAVD88 Minimal 20.9 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Cooling Tower (POI 67) 21.0 ft NAVD88 Minimal 21.0 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Cooling Tower (POI 68 and 70) 21.2 ft NAVD88 Minimal 21.2 ft NAVD88 FHRR Table 4-3, FHRR Table 4-41, and FHRR Figure 4-9 Surge+Wave Overtopping at Cooling Tower (POI 69)
Note 3: Storm surge elevations at locations other than the seawall reflect water elevations on the site as a result of waves overtopping the seawall and water flowing across the site. Staff added the resulting overtopping depths (FHRR Table 4-41) and ground elevations to compute the stillwater elevations at the POIs associated with site buildings as shown in FHRR 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 on building walls can be expected to be somewhat more than that described in the CDB (FHRR Section 5.4).
Note 4: To develop storm surge elevations at locations other than the seawall, staff sorted and grouped the stillwater 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 5: With respect to storm surge elevations at locations other than the seawall, the licensee stated in FHRR Table 4-3 that it is apparent that the stated WSEL for POI 30 is not the general surface elevation of the floodwater in that location, particularly given the 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 6: With respect to storm surge elevations at locations other than the seawall, the licensee stated in FHRR Table 4-41 that POI 29 is located on top of the RHR vault roof; therefore, flood depths do not accumulate because the RHR Vault roof is higher than the maximum flood water levels in the area. The licensee does not provide the definition of RHR within the FHRR.
Note 7: Values reported for local intense precipitation are representative values for each building