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
Seabrook Station, Unit 1 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 Maximum water surface 19.9 ft Minimal 19.9 ft FHRR Section 3.1 elevation not crediting storm NAVD88 NAVD88 drainage system.
Streams and Rivers PMP combined with tidal effect No Impact No Impact No Impact FHRR Table 5-1, Note 1 on the Site on the Site on the Site Identified Identified Identified Failure of Dams and Onsite Water Control/Storage Structures No Impact No Impact No Impact FHRR Section 3.3 and FHRR Table on the Site on the Site on the Site 5-1 Identified Identified Identified Storm Surge Surge at Seawall 14.8 ft 14.8 ft FHRR Section 5.4 and FHRR Table NAVD88 Minimal NAVD88 5-1 Site ponding due to surge 20.2 ft 0.8 ft 21.0 ft FHRR Section 5.4 and FHRR Table (waves overtopping seawall) NAVD88 NAVD88 5-1 Seiche No Impact No Impact No Impact FHRR Table 5-1 on the Site on the Site on the Site Identified Identified Identified Tsunami No Impact No Impact No Impact FHRR Table 5-1 on the Site on the Site on the Site Identified Identified Identified Ice-Induced Flooding No Impact No Impact No Impact FHRR Table 5-1 on the Site on the Site on the Site Identified Identified Identified
Seabrook Station, Unit 1 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 3.9 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: 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)."
Seabrook Station, Unit 1 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 Pump House/Site-specific PMP - 20.7 ft Minimal 20.7 ft Table 4-3 of FHRR Point of Interest (POI) 12 NAVD88 NAVD88 Containment Units 1/Site-specific 21.8 ft Minimal 21.8 ft Table 4-3 of FHRR PMP - POI 59 NAVD88 NAVD88 Turbine Building/Site-specific 20.6 ft Minimal 20.6 ft Table 4-3 of FHRR PMP - POI 57 NAVD88 NAVD88 Fuel Storage Building/Site- 20.8 ft Minimal 20.8 ft Table 4-3 of FHRR specific PMP - POI 19 NAVD88 NAVD88 Waste Process Building/Site- 23.8 ft Minimal 23.8 ft Table 4-3 of FHRR specific PMP - POI 25 NAVD88 NAVD88 Administration Building/Site- 20.9 ft Minimal 20.9 ft Table 4-3 of FHRR specific PMP - POI 36 NAVD88 NAVD88 Cooling Tower/Site-specific 20.3 ft Minimal 20.3 ft Table 4-3 of FHRR PMP - POI 69 NAVD88 NAVD88 Dry Fuel Storage Pad/Site- 25.1 ft Minimal 25.1 ft Table 4-3 of FHRR specific PMP - POI 83 NAVD88 NAVD88 Storm Surge Seawall 17.8 ft 5.6 ft 23.4 ft FHRR Table 5-1 NAVD88 NAVD88 Surge+Wave Overtopping at 20.2 ft 20.2 ft FHRR Table 4-3, FHRR Table 4-41, Intake Building (POI 1) NAVD88 Minimal NAVD88 and FHRR Figure 4-9
Seabrook Station, Unit 1 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism Stillwater Waves/ Reevaluated Reference Elevation Runup Hazard Elevation Surge+Wave Overtopping at 20.0 ft 20.0 ft FHRR Table 4-3, FHRR Table 4-41, Pump House Building (POI 11) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 20.3 ft 20.3 ft FHRR Table 4-3, FHRR Table 4-41, Pump House Building (POI 9, 10, NAVD88 Minimal NAVD88 and FHRR Figure 4-9 12 and 13)
Surge+Wave Overtopping at 20.4 ft 20.4 ft FHRR Table 4-3, FHRR Table 4-41, Pump House Building (POI 3 and NAVD88 Minimal NAVD88 and FHRR Figure 4-9 6)
Surge+Wave Overtopping at 20.6 ft 20.6 ft FHRR Table 4-3, FHRR Table 4-41, Pump House Building (POI 7 and NAVD88 Minimal NAVD88 and FHRR Figure 4-9 8)
Surge+Wave Overtopping at 20.7 ft 20.7 ft FHRR Table 4-3, FHRR Table 4-41, Pump House Building (POI 5 and NAVD88 Minimal NAVD88 and FHRR Figure 4-9 14)
Surge+Wave Overtopping at 20.8 ft 20.8 ft FHRR Table 4-3, FHRR Table 4-41, Pump House Building (POI 4) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping (POI 20.2 ft 20.2 ft FHRR Table 4-3, FHRR Table 4-41,
- 15) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 20.3 ft 20.3 ft FHRR Table 4-3, FHRR Table 4-41, Containment Unit 1 (POI 62) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 20.5 ft 20.5 ft FHRR Table 4-3, FHRR Table 4-41, Containment Unit 1 (POI 16 and NAVD88 Minimal NAVD88 and FHRR Figure 4-9 17)
Surge+Wave Overtopping at 20.6 ft 20.6 ft FHRR Table 4-3, FHRR Table 4-41, Containment Unit 1 (POI 63) NAVD88 Minimal NAVD88 and FHRR Figure 4-9
Seabrook Station, Unit 1 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism Stillwater Waves/ Reevaluated Reference Elevation Runup Hazard Elevation Surge+Wave Overtopping at 20.8 ft 20.8 ft FHRR Table 4-3, FHRR Table 4-41, Containment Unit 1 (POI 61) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 20.9 ft 20.9 ft FHRR Table 4-3, FHRR Table 4-41, Containment Unit 1 (POI 60) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 21.0 ft 21.0 ft FHRR Table 4-3, FHRR Table 4-41, Containment Unit 1 (POI 59) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 22.1 ft 22.1 ft FHRR Table 4-3, FHRR Table 4-41, Containment Unit 1 (POI 18) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 20.2 ft 20.2 ft FHRR Table 4-3, FHRR Table 4-41, Waste Process Building (POI 21) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 20.5 ft 20.5 ft FHRR Table 4-3, FHRR Table 4-41, Waste Process Building (POI 22) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 20.6 ft 20.6 ft FHRR Table 4-3, FHRR Table 4-41, Waste Process Building (POI 23) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 20.8 ft 20.8 ft FHRR Table 4-3, FHRR Table 4-41, Waste Process Building (POI 27) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 21.0 ft 21.0 ft FHRR Table 4-3, FHRR Table 4-41, Waste Process Building (POI 24) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 23.1 ft 23.1 ft FHRR Table 4-3, FHRR Table 4-41, Waste Process Building (POI 26) NAVD88 Minimal NAVD88 and FHRR Figure 4-9
Seabrook Station, Unit 1 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism Stillwater Waves/ Reevaluated Reference Elevation Runup Hazard Elevation Surge+Wave Overtopping at 24.6 ft 24.6 ft FHRR Table 4-3, FHRR Table 4-41, Waste Process Building (POI 25) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 20.2 ft 20.2 ft FHRR Table 4-3, FHRR Table 4-41, Administration Building (POI 50) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 20.4 ft 20.4 ft FHRR Table 4-3, FHRR Table 4-41, Administration Building (POI 49) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 20.5 ft 20.5 ft FHRR Table 4-3, FHRR Table 4-41, Administration Building (POI 31 NAVD88 Minimal NAVD88 and FHRR Figure 4-9 and 48)
Surge+Wave Overtopping at 20.6 ft 20.6 ft FHRR Table 4-3, FHRR Table 4-41, Administration Building (POI 28, NAVD88 Minimal NAVD88 and FHRR Figure 4-9 36, 37 and 51)
Surge+Wave Overtopping at 20.7 ft 20.7 ft FHRR Table 4-3, FHRR Table 4-41, Administration Building (POI 44, NAVD88 Minimal NAVD88 and FHRR Figure 4-9 45, 46 and 47)
Surge+Wave Overtopping at 20.8 ft 20.8 ft FHRR Table 4-3, FHRR Table 4-41, Administration Building (POI 35, NAVD88 Minimal NAVD88 and FHRR Figure 4-9 38 and 42)
Surge+Wave Overtopping at 20.9 ft 20.9 ft FHRR Table 4-3, FHRR Table 4-41, Administration Building (POI 32 NAVD88 Minimal NAVD88 and FHRR Figure 4-9 and 39)
Surge+Wave Overtopping at 21.0 ft 21.0 ft FHRR Table 4-3, FHRR Table 4-41, Administration Building (POI 43) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 21.1 ft 21.1 ft FHRR Table 4-3, FHRR Table 4-41, Administration Building (POI 33 NAVD88 Minimal NAVD88 and FHRR Figure 4-9 and 41)
Seabrook Station, Unit 1 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism Stillwater Waves/ Reevaluated Reference Elevation Runup Hazard Elevation Surge+Wave Overtopping at 21.2 ft 21.2 ft FHRR Table 4-3, FHRR Table 4-41, Administration Building (POI 40) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 21.3 ft 21.3 ft FHRR Table 4-3, FHRR Table 4-41, Administration Building (POI 34) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 24.3 ft 24.3 ft FHRR Table 4-3, FHRR Table 4-41, Administration Building (POI 30) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 20.4 ft 20.4 ft FHRR Table 4-3, FHRR Table 4-41, Turbine Building (POI 58) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 20.5 ft 20.5 ft FHRR Table 4-3, FHRR Table 4-41, Turbine Building (POI 53) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 20.6 ft 20.6 ft FHRR Table 4-3, FHRR Table 4-41, Turbine Building (POI 52) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 20.3 ft 20.3 ft FHRR Table 4-3, FHRR Table 4-41, Cooling Tower (POI 65 and 66) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 20.4 ft 20.4 ft FHRR Table 4-3, FHRR Table 4-41, Cooling Tower (POI 64 and 72) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 20.6 ft 20.6 ft FHRR Table 4-3, FHRR Table 4-41, Cooling Tower (POI 73) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 20.7 ft 20.7 ft FHRR Table 4-3, FHRR Table 4-41, Cooling Tower (POI 74) NAVD88 Minimal NAVD88 and FHRR Figure 4-9
Seabrook Station, Unit 1 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism Stillwater Waves/ Reevaluated Reference Elevation Runup Hazard Elevation Surge+Wave Overtopping at 20.8 ft 20.8 ft FHRR Table 4-3, FHRR Table 4-41, Cooling Tower (POI 71 and 75) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 20.9 ft 20.9 ft FHRR Table 4-3, FHRR Table 4-41, Cooling Tower (POI 67) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 21.0 ft 21.0 ft FHRR Table 4-3, FHRR Table 4-41, Cooling Tower (POI 68 and 70) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 Surge+Wave Overtopping at 21.2 ft 21.2 ft FHRR Table 4-3, FHRR Table 4-41, Cooling Tower (POI 69) NAVD88 Minimal NAVD88 and FHRR Figure 4-9 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.
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