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{{#Wiki_filter:Indian Point Nuclear Generating Units 2 & 3 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     Flood Hazard Reevaulation Report in DB            in DB              in DB        (FHRR) Revision 2, Section 4.1.1 Streams and Rivers Probable Maximum Flood (PMF)         12.7 ft             1.0 ft           13.7 ft     FHRR Revision 2, Section 2.3.1 and on the Hudson River                NGVD29                              NGVD29                    Table 4.1-1 PMF with Low Tide on the             13.0 ft             1.0 ft           14.0 ft     FHRR Revision 2, Section 2.3.1 and Hudson River                        NGVD29                              NGVD29                    Table 4.1-1 PMF with High Tide on the           12.4 ft             1.0 ft           13.4 ft     FHRR Revision 2, Section 2.3.1 and Hudson River                        NGVD29                              NGVD29                    Table 4.1-1 Failure of Dams and Onsite Water Control/Storage Structures REDACTED                          REDACTED          REDACTED          REDACTED                  REDACTED Storm Surge Probable Maximum Hurricane           13.5 ft             1.0 ft           14.5 ft     FHRR Revision 2, Section 2.3.1 and (PMH) with Spring High Tide on      NGVD29                              NGVD29                    Table 4.1-1 the Hudson River Standard Project Hurricane and       13.0 ft             1.0 ft           14.0 ft     FHRR Revision 2, Section 2.3.1 and Standard Project Flood on the      NGVD29                              NGVD29                    Table 4.1-1 Hudson River REDACTED                         REDACTED         REDACTED           REDACTED                   REDACTED REDACTED                         REDACTED         REDACTED           REDACTED                   REDACTED 1
{{#Wiki_filter:Indian Point Nuclear Generating Units 2 & 3 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 Not included in DB Not included in DB Not included in DB Flood Hazard Reevaulation Report (FHRR) Revision 2, Section 4.1.1 Failure of Dams and Onsite Water Control/Storage Structures REDACTED REDACTED REDACTED REDACTED REDACTED Streams and Rivers Probable Maximum Flood (PMF) on the Hudson River 12.7 ft NGVD29 1.0 ft 13.7 ft NGVD29 FHRR Revision 2, Section 2.3.1 and Table 4.1-1 PMF with Low Tide on the Hudson River 13.0 ft NGVD29 1.0 ft 14.0 ft NGVD29 FHRR Revision 2, Section 2.3.1 and Table 4.1-1 PMF with High Tide on the Hudson River 12.4 ft NGVD29 1.0 ft 13.4 ft NGVD29 FHRR Revision 2, Section 2.3.1 and Table 4.1-1 Storm Surge Probable Maximum Hurricane (PMH) with Spring High Tide on the Hudson River 13.5 ft NGVD29 1.0 ft 14.5 ft NGVD29 FHRR Revision 2, Section 2.3.1 and Table 4.1-1 Standard Project Hurricane and Standard Project Flood on the Hudson River 13.0 ft NGVD29 1.0 ft 14.0 ft NGVD29 FHRR Revision 2, Section 2.3.1 and Table 4.1-1 REDACTED REDACTED REDACTED REDACTED REDACTED REDACTED REDACTED REDACTED REDACTED REDACTED 1


Indian Point Nuclear Generating Units 2 & 3 Table 1. Current Design Basis Flood Hazards for Use in the MSA Mechanism               Stillwater         Waves/         Design Basis               Reference Elevation            Runup              Hazard Elevation Seiche Not included     Not included       Not included     FHRR Revision 2, Section 4.1.5 in DB              in DB              in DB Tsunami Not included     Not included       Not included     FHRR Revision 2, Section 4.1.6 in DB              in DB              in DB Ice-Induced Flooding Not included     Not included       Not included     FHRR Revision 2, Section 4.1.7 in DB              in DB              in DB Channel Migrations/Diversions Not included     Not included       Not included     FHRR Revision 2, Section 4.1.8 in DB              in DB              in DB Note 1: Reported values are rounded to the nearest one-tenth of a foot.
Indian Point Nuclear Generating Units 2 & 3 Table 1. Current Design Basis Flood Hazards for Use in the MSA Mechanism Stillwater Elevation Waves/
2
Runup Reference Design Basis Hazard Elevation Note 1: Reported values are rounded to the nearest one-tenth of a foot.
Seiche Not included in DB Not included in DB Not included in DB FHRR Revision 2, Section 4.1.5 Tsunami Not included in DB Not included in DB Not included in DB FHRR Revision 2, Section 4.1.6 Ice-Induced Flooding Not included in DB Not included in DB Not included in DB FHRR Revision 2, Section 4.1.7 Channel Migrations/Diversions Not included in DB Not included in DB Not included in DB FHRR Revision 2, Section 4.1.8 2


Indian Point Nuclear Generating Units 2 & 3 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 2 Transformer Yard Doors      18.8 ft           Minimal           18.8 ft       Letter dated August 18, 2014, Maximum Water-Surface            NGVD29                              NGVD29      entitled "Revised FLO-2D Analysis Elevation - Door ID U2-ABFP-2                                                            to Address the Current LIP Regarding the Flooding Aspects of Recommendations 2.1 of the Near-Unit 2 Transformer Yard Doors      18.8 ft          Minimal            18.8 ft      Term Task Force Review of the Maximum Water-Surface            NGVD29                              NGVD29      Insights from the Fukushima Dai-ichi Elevation - Door ID U2-ABFP-3                                                      Accident Indian Point Units Nos. 2 and 3." ADAMS Accession Unit 2 Transformer Yard Doors     19.1 ft          Minimal            19.1 ft              No. ML16116A060 Maximum Water-Surface             NGVD29                              NGVD29 Elevation - Door ID U2-CB-1 Unit 2 Transformer Yard Doors      19.2 ft           Minimal           19.2 ft Maximum Water-Surface             NGVD29                              NGVD29 Elevation - Door ID U2-PAB-1 Unit 2 Transformer Yard Doors      19.0 ft           Minimal           19.0 ft Maximum Water-Surface             NGVD29                              NGVD29 Elevation - Door ID U2-ABFP-1 Unit 3 Transformer Yard Doors      18.3 ft           Minimal           18.3 ft Maximum Water-Surface             NGVD29                              NGVD29 Elevation - Door ID U3-ABFP-1 Unit 3 Transformer Yard Doors      18.5 ft           Minimal           18.5 ft Maximum Water-Surface             NGVD29                              NGVD29 Elevation - Door ID U3-ABFP-2 Unit 3 Transformer Yard Doors      18.6 ft           Minimal           18.6 ft Maximum Water-Surface             NGVD29                              NGVD29 Elevation - Door ID U3-ABFP-3 Unit 3 Transformer Yard Doors      18.8 ft           Minimal           18.8 ft Maximum Water-Surface             NGVD29                              NGVD29 Elevation - Door ID U3-PAB-1 Unit 3 Transformer Yard Doors      18.9 ft           Minimal           18.9 ft Maximum Water-Surface             NGVD29                               NGVD29 Elevation - Door ID U3-PAB-2 Unit 3 Transformer Yard Doors     19.2 ft           Minimal           19.2 ft Maximum Water-Surface             NGVD29                              NGVD29 Elevation - Door ID U3-CB-1 1
Indian Point Nuclear Generating Units 2 & 3 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 18.8 ft NGVD29 Minimal 18.8 ft NGVD29 Letter dated August 18, 2014, entitled "Revised FLO-2D Analysis to Address the Current LIP Regarding the Flooding Aspects of Recommendations 2.1 of the Near-Term Task Force Review of the Insights from the Fukushima Dai-ichi Accident Indian Point Units Nos. 2 and 3." ADAMS Accession No. ML16116A060 Unit 2 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U2-ABFP-2 18.8 ft NGVD29 Minimal 18.8 ft NGVD29 Unit 2 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U2-ABFP-3 19.1 ft NGVD29 Minimal 19.1 ft NGVD29 Unit 2 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U2-CB-1 18.3 ft NGVD29 Minimal 18.3 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-ABFP-1 18.5 ft NGVD29 Minimal 18.5 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-ABFP-2 18.6 ft NGVD29 Minimal 18.6 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-ABFP-3 18.8 ft NGVD29 Minimal 18.8 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-PAB-1 18.9 ft NGVD29 Minimal 18.9 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-PAB-2 19.2 ft NGVD29 Minimal 19.2 ft NGVD29 Unit 2 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U2-PAB-1 19.0 ft NGVD29 Minimal 19.0 ft NGVD29 Unit 2 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U2-ABFP-1 19.2 ft NGVD29 Minimal 19.2 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-CB-1 1


Indian Point Nuclear Generating Units 2 & 3 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism             Stillwater         Waves/         Reevaluated                   Reference Elevation          Runup              Hazard Elevation Streams and Rivers Cool Season on Hudson River        16.5 ft           2.1 ft           18.6 ft     FHRR Rev. 2 (12/9/2014) Sections PMF with Snow Pack Coincident    NGVD29                              NGVD29      3.4.2.5.1, 3.4.2.5.2, and FHRR (Rev.
Indian Point Nuclear Generating Units 2 & 3 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism Stillwater Elevation Waves/
with 25-year Surge and 10%                                                                12/10/2015) Section 6.2.2 Exceedance High Tide Failure of Dams and Onsite Water Control/Storage Structures REDACTED                       REDACTED         REDACTED           REDACTED                   REDACTED Storm Surge Combined Event with 150,000 cfs    18.9 ft           2.9 ft             21.8 ft     Letter dated April 5, 2016, entitled Flow in Hudson River Coincident  NGVD29                              NGVD29        "Entergy Supplement to Basis for with the Probable Maximum                                                              Performance of the Mitigating Storm Surge (PMSS), Including                                                        Strategies Assessment with the Antecedent Water Level (AWL)                                                      Flood Hazard Information and Report and Coincident Wind-Generated                                                        for Recommendations 2.1 of the Waves (CWGW) - Values                                                                Near-Term Task Force Review of Reported in Open Water in River                                                    Insights from the Fukushima Dai-ichi Outboard of River Bulkhead and                                                          Accident ADAMS Accession U2 Intake Structure                                                                          No. ML16104A041 Combined Event with 150,000 cfs   18.9 ft           2.1 ft             21.0 ft Flow in Hudson River Coincident   NGVD29                              NGVD29 with PMSS, Including AWL and CWGW - Values Reported in Open Areas of Powerblock Yard Between U2 Intake Structure and U2 Turbine Building Combined Event with 150,000 cfs    18.9 ft           4.7 ft             23.6 ft Flow in Hudson River Coincident   NGVD29                              NGVD29 with PMSS, Including AWL and CWGW - Values Reported at River-facing Sides of Structures Between the River Bulkhead and the Turbine Buildings (Including West Sides of U2 and U3 Intake Structures) and River-facing (West) Side of U2 and U3 Turbine Buildings 2
Runup Reevaluated Hazard Elevation Reference Streams and Rivers 16.5 ft NGVD29 2.1 ft 18.6 ft NGVD29 FHRR Rev. 2 (12/9/2014) Sections 3.4.2.5.1, 3.4.2.5.2, and FHRR (Rev.
12/10/2015) Section 6.2.2 Cool Season on Hudson River PMF with Snow Pack Coincident with 25-year Surge and 10%
Exceedance High Tide Failure of Dams and Onsite Water Control/Storage Structures REDACTED REDACTED REDACTED REDACTED REDACTED Storm Surge 18.9 ft NGVD29 2.9 ft 21.8 ft NGVD29 Letter dated April 5, 2016, entitled "Entergy Supplement to Basis for Performance of the Mitigating Strategies Assessment with the Flood Hazard Information and Report for Recommendations 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident ADAMS Accession No. ML16104A041 Combined Event with 150,000 cfs Flow in Hudson River Coincident with the Probable Maximum Storm Surge (PMSS), Including Antecedent Water Level (AWL) and Coincident Wind-Generated Waves (CWGW) - Values Reported in Open Water in River Outboard of River Bulkhead and U2 Intake Structure 18.9 ft NGVD29 2.1 ft 21.0 ft NGVD29 Combined Event with 150,000 cfs Flow in Hudson River Coincident with PMSS, Including AWL and CWGW - Values Reported in Open Areas of Powerblock Yard Between U2 Intake Structure and U2 Turbine Building 18.9 ft NGVD29 4.7 ft 23.6 ft NGVD29 Combined Event with 150,000 cfs Flow in Hudson River Coincident with PMSS, Including AWL and CWGW - Values Reported at River-facing Sides of Structures Between the River Bulkhead and the Turbine Buildings (Including West Sides of U2 and U3 Intake Structures) and River-facing (West) Side of U2 and U3 Turbine Buildings 2


Indian Point Nuclear Generating Units 2 & 3 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism                 Stillwater         Waves/         Reevaluated                   Reference Elevation            Runup              Hazard Elevation Storm Surge (continued)
Indian Point Nuclear Generating Units 2 & 3 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism Stillwater Elevation Waves/
Combined Event with 150,000 cfs        18.9 ft             0.0 ft             18.9 ft     Letter dated April 5, 2016, entitled Flow in Hudson River Coincident      NGVD29                                NGVD29        "Entergy Supplement to Basis for with PMSS, Including AWL and                                                                Performance of the Mitigating CWGW - Values Reported at                                                                  Strategies Assessment with the Location East of U2 and U3                                                              Flood Hazard Information and Report Turbine Buildings                                                                          for Recommendations 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident ADAMS Accession No. ML16104A041 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.
Runup Reevaluated Hazard Elevation Reference Storm Surge (continued) 18.9 ft NGVD29 0.0 ft 18.9 ft NGVD29 Letter dated April 5, 2016, entitled "Entergy Supplement to Basis for Performance of the Mitigating Strategies Assessment with the Flood Hazard Information and Report for Recommendations 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident ADAMS Accession No. ML16104A041 Combined Event with 150,000 cfs Flow in Hudson River Coincident with PMSS, Including AWL and CWGW - Values Reported at Location East of U2 and U3 Turbine Buildings 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.
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.
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.
3
3


Indian Point Nuclear Generating Units 2 & 3 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     Flood Hazard Reevaulation Report in DB            in DB              in DB        (FHRR) Revision 2, Section 4.1.1 Streams and Rivers Probable Maximum Flood (PMF)         12.7 ft             1.0 ft           13.7 ft     FHRR Revision 2, Section 2.3.1 and on the Hudson River                NGVD29                              NGVD29                    Table 4.1-1 PMF with Low Tide on the             13.0 ft             1.0 ft           14.0 ft     FHRR Revision 2, Section 2.3.1 and Hudson River                        NGVD29                              NGVD29                    Table 4.1-1 PMF with High Tide on the           12.4 ft             1.0 ft           13.4 ft     FHRR Revision 2, Section 2.3.1 and Hudson River                        NGVD29                              NGVD29                    Table 4.1-1 Failure of Dams and Onsite Water Control/Storage Structures REDACTED                          REDACTED          REDACTED          REDACTED                  REDACTED Storm Surge Probable Maximum Hurricane           13.5 ft             1.0 ft           14.5 ft     FHRR Revision 2, Section 2.3.1 and (PMH) with Spring High Tide on      NGVD29                              NGVD29                    Table 4.1-1 the Hudson River Standard Project Hurricane and       13.0 ft             1.0 ft           14.0 ft     FHRR Revision 2, Section 2.3.1 and Standard Project Flood on the      NGVD29                              NGVD29                    Table 4.1-1 Hudson River REDACTED                         REDACTED         REDACTED           REDACTED                   REDACTED REDACTED                         REDACTED         REDACTED           REDACTED                   REDACTED 1
Indian Point Nuclear Generating Units 2 & 3 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 Not included in DB Not included in DB Not included in DB Flood Hazard Reevaulation Report (FHRR) Revision 2, Section 4.1.1 Failure of Dams and Onsite Water Control/Storage Structures REDACTED REDACTED REDACTED REDACTED REDACTED Streams and Rivers Probable Maximum Flood (PMF) on the Hudson River 12.7 ft NGVD29 1.0 ft 13.7 ft NGVD29 FHRR Revision 2, Section 2.3.1 and Table 4.1-1 PMF with Low Tide on the Hudson River 13.0 ft NGVD29 1.0 ft 14.0 ft NGVD29 FHRR Revision 2, Section 2.3.1 and Table 4.1-1 PMF with High Tide on the Hudson River 12.4 ft NGVD29 1.0 ft 13.4 ft NGVD29 FHRR Revision 2, Section 2.3.1 and Table 4.1-1 Storm Surge Probable Maximum Hurricane (PMH) with Spring High Tide on the Hudson River 13.5 ft NGVD29 1.0 ft 14.5 ft NGVD29 FHRR Revision 2, Section 2.3.1 and Table 4.1-1 Standard Project Hurricane and Standard Project Flood on the Hudson River 13.0 ft NGVD29 1.0 ft 14.0 ft NGVD29 FHRR Revision 2, Section 2.3.1 and Table 4.1-1 REDACTED REDACTED REDACTED REDACTED REDACTED REDACTED REDACTED REDACTED REDACTED REDACTED 1


Indian Point Nuclear Generating Units 2 & 3 Table 1. Current Design Basis Flood Hazards for Use in the MSA Mechanism               Stillwater         Waves/         Design Basis               Reference Elevation            Runup              Hazard Elevation Seiche Not included     Not included       Not included     FHRR Revision 2, Section 4.1.5 in DB              in DB              in DB Tsunami Not included     Not included       Not included     FHRR Revision 2, Section 4.1.6 in DB              in DB              in DB Ice-Induced Flooding Not included     Not included       Not included     FHRR Revision 2, Section 4.1.7 in DB              in DB              in DB Channel Migrations/Diversions Not included     Not included       Not included     FHRR Revision 2, Section 4.1.8 in DB              in DB              in DB Note 1: Reported values are rounded to the nearest one-tenth of a foot.
Indian Point Nuclear Generating Units 2 & 3 Table 1. Current Design Basis Flood Hazards for Use in the MSA Mechanism Stillwater Elevation Waves/
2
Runup Reference Design Basis Hazard Elevation Note 1: Reported values are rounded to the nearest one-tenth of a foot.
Seiche Not included in DB Not included in DB Not included in DB FHRR Revision 2, Section 4.1.5 Tsunami Not included in DB Not included in DB Not included in DB FHRR Revision 2, Section 4.1.6 Ice-Induced Flooding Not included in DB Not included in DB Not included in DB FHRR Revision 2, Section 4.1.7 Channel Migrations/Diversions Not included in DB Not included in DB Not included in DB FHRR Revision 2, Section 4.1.8 2


Indian Point Nuclear Generating Units 2 & 3 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 2 Transformer Yard Doors      18.8 ft           Minimal           18.8 ft       Letter dated August 18, 2014, Maximum Water-Surface            NGVD29                              NGVD29      entitled "Revised FLO-2D Analysis Elevation - Door ID U2-ABFP-2                                                            to Address the Current LIP Regarding the Flooding Aspects of Recommendations 2.1 of the Near-Unit 2 Transformer Yard Doors      18.8 ft          Minimal            18.8 ft      Term Task Force Review of the Maximum Water-Surface            NGVD29                              NGVD29      Insights from the Fukushima Dai-ichi Elevation - Door ID U2-ABFP-3                                                      Accident Indian Point Units Nos. 2 and 3." ADAMS Accession Unit 2 Transformer Yard Doors     19.1 ft          Minimal            19.1 ft              No. ML16116A060 Maximum Water-Surface             NGVD29                              NGVD29 Elevation - Door ID U2-CB-1 Unit 2 Transformer Yard Doors      19.2 ft           Minimal           19.2 ft Maximum Water-Surface             NGVD29                              NGVD29 Elevation - Door ID U2-PAB-1 Unit 2 Transformer Yard Doors      19.0 ft           Minimal           19.0 ft Maximum Water-Surface             NGVD29                              NGVD29 Elevation - Door ID U2-ABFP-1 Unit 3 Transformer Yard Doors      18.3 ft           Minimal           18.3 ft Maximum Water-Surface             NGVD29                              NGVD29 Elevation - Door ID U3-ABFP-1 Unit 3 Transformer Yard Doors      18.5 ft           Minimal           18.5 ft Maximum Water-Surface             NGVD29                              NGVD29 Elevation - Door ID U3-ABFP-2 Unit 3 Transformer Yard Doors      18.6 ft           Minimal           18.6 ft Maximum Water-Surface             NGVD29                              NGVD29 Elevation - Door ID U3-ABFP-3 Unit 3 Transformer Yard Doors      18.8 ft           Minimal           18.8 ft Maximum Water-Surface             NGVD29                              NGVD29 Elevation - Door ID U3-PAB-1 Unit 3 Transformer Yard Doors      18.9 ft           Minimal           18.9 ft Maximum Water-Surface             NGVD29                               NGVD29 Elevation - Door ID U3-PAB-2 Unit 3 Transformer Yard Doors     19.2 ft           Minimal           19.2 ft Maximum Water-Surface             NGVD29                              NGVD29 Elevation - Door ID U3-CB-1 1
Indian Point Nuclear Generating Units 2 & 3 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 18.8 ft NGVD29 Minimal 18.8 ft NGVD29 Letter dated August 18, 2014, entitled "Revised FLO-2D Analysis to Address the Current LIP Regarding the Flooding Aspects of Recommendations 2.1 of the Near-Term Task Force Review of the Insights from the Fukushima Dai-ichi Accident Indian Point Units Nos. 2 and 3." ADAMS Accession No. ML16116A060 Unit 2 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U2-ABFP-2 18.8 ft NGVD29 Minimal 18.8 ft NGVD29 Unit 2 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U2-ABFP-3 19.1 ft NGVD29 Minimal 19.1 ft NGVD29 Unit 2 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U2-CB-1 18.3 ft NGVD29 Minimal 18.3 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-ABFP-1 18.5 ft NGVD29 Minimal 18.5 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-ABFP-2 18.6 ft NGVD29 Minimal 18.6 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-ABFP-3 18.8 ft NGVD29 Minimal 18.8 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-PAB-1 18.9 ft NGVD29 Minimal 18.9 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-PAB-2 19.2 ft NGVD29 Minimal 19.2 ft NGVD29 Unit 2 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U2-PAB-1 19.0 ft NGVD29 Minimal 19.0 ft NGVD29 Unit 2 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U2-ABFP-1 19.2 ft NGVD29 Minimal 19.2 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-CB-1 1


Indian Point Nuclear Generating Units 2 & 3 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism             Stillwater         Waves/         Reevaluated                   Reference Elevation          Runup              Hazard Elevation Streams and Rivers Cool Season on Hudson River        16.5 ft           2.1 ft           18.6 ft     FHRR Rev. 2 (12/9/2014) Sections PMF with Snow Pack Coincident    NGVD29                              NGVD29      3.4.2.5.1, 3.4.2.5.2, and FHRR (Rev.
Indian Point Nuclear Generating Units 2 & 3 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism Stillwater Elevation Waves/
with 25-year Surge and 10%                                                                12/10/2015) Section 6.2.2 Exceedance High Tide Failure of Dams and Onsite Water Control/Storage Structures REDACTED                       REDACTED         REDACTED           REDACTED                   REDACTED Storm Surge Combined Event with 150,000 cfs    18.9 ft           2.9 ft             21.8 ft     Letter dated April 5, 2016, entitled Flow in Hudson River Coincident  NGVD29                              NGVD29        "Entergy Supplement to Basis for with the Probable Maximum                                                              Performance of the Mitigating Storm Surge (PMSS), Including                                                        Strategies Assessment with the Antecedent Water Level (AWL)                                                      Flood Hazard Information and Report and Coincident Wind-Generated                                                        for Recommendations 2.1 of the Waves (CWGW) - Values                                                                Near-Term Task Force Review of Reported in Open Water in River                                                    Insights from the Fukushima Dai-ichi Outboard of River Bulkhead and                                                          Accident ADAMS Accession U2 Intake Structure                                                                          No. ML16104A041 Combined Event with 150,000 cfs   18.9 ft           2.1 ft             21.0 ft Flow in Hudson River Coincident   NGVD29                              NGVD29 with PMSS, Including AWL and CWGW - Values Reported in Open Areas of Powerblock Yard Between U2 Intake Structure and U2 Turbine Building Combined Event with 150,000 cfs    18.9 ft           4.7 ft             23.6 ft Flow in Hudson River Coincident   NGVD29                              NGVD29 with PMSS, Including AWL and CWGW - Values Reported at River-facing Sides of Structures Between the River Bulkhead and the Turbine Buildings (Including West Sides of U2 and U3 Intake Structures) and River-facing (West) Side of U2 and U3 Turbine Buildings 2
Runup Reevaluated Hazard Elevation Reference Streams and Rivers 16.5 ft NGVD29 2.1 ft 18.6 ft NGVD29 FHRR Rev. 2 (12/9/2014) Sections 3.4.2.5.1, 3.4.2.5.2, and FHRR (Rev.
12/10/2015) Section 6.2.2 Cool Season on Hudson River PMF with Snow Pack Coincident with 25-year Surge and 10%
Exceedance High Tide Failure of Dams and Onsite Water Control/Storage Structures REDACTED REDACTED REDACTED REDACTED REDACTED Storm Surge 18.9 ft NGVD29 2.9 ft 21.8 ft NGVD29 Letter dated April 5, 2016, entitled "Entergy Supplement to Basis for Performance of the Mitigating Strategies Assessment with the Flood Hazard Information and Report for Recommendations 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident ADAMS Accession No. ML16104A041 Combined Event with 150,000 cfs Flow in Hudson River Coincident with the Probable Maximum Storm Surge (PMSS), Including Antecedent Water Level (AWL) and Coincident Wind-Generated Waves (CWGW) - Values Reported in Open Water in River Outboard of River Bulkhead and U2 Intake Structure 18.9 ft NGVD29 2.1 ft 21.0 ft NGVD29 Combined Event with 150,000 cfs Flow in Hudson River Coincident with PMSS, Including AWL and CWGW - Values Reported in Open Areas of Powerblock Yard Between U2 Intake Structure and U2 Turbine Building 18.9 ft NGVD29 4.7 ft 23.6 ft NGVD29 Combined Event with 150,000 cfs Flow in Hudson River Coincident with PMSS, Including AWL and CWGW - Values Reported at River-facing Sides of Structures Between the River Bulkhead and the Turbine Buildings (Including West Sides of U2 and U3 Intake Structures) and River-facing (West) Side of U2 and U3 Turbine Buildings 2


Indian Point Nuclear Generating Units 2 & 3 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism                 Stillwater         Waves/         Reevaluated                   Reference Elevation            Runup              Hazard Elevation Storm Surge (continued)
Indian Point Nuclear Generating Units 2 & 3 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism Stillwater Elevation Waves/
Combined Event with 150,000 cfs        18.9 ft             0.0 ft             18.9 ft     Letter dated April 5, 2016, entitled Flow in Hudson River Coincident      NGVD29                                NGVD29        "Entergy Supplement to Basis for with PMSS, Including AWL and                                                                Performance of the Mitigating CWGW - Values Reported at                                                                  Strategies Assessment with the Location East of U2 and U3                                                              Flood Hazard Information and Report Turbine Buildings                                                                          for Recommendations 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident ADAMS Accession No. ML16104A041 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.
Runup Reevaluated Hazard Elevation Reference Storm Surge (continued) 18.9 ft NGVD29 0.0 ft 18.9 ft NGVD29 Letter dated April 5, 2016, entitled "Entergy Supplement to Basis for Performance of the Mitigating Strategies Assessment with the Flood Hazard Information and Report for Recommendations 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident ADAMS Accession No. ML16104A041 Combined Event with 150,000 cfs Flow in Hudson River Coincident with PMSS, Including AWL and CWGW - Values Reported at Location East of U2 and U3 Turbine Buildings 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.
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.
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.
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Latest revision as of 00:57, 10 January 2025

Enclosure to Indian Point Nuclear Generating Unit Nos. 2 and 3 MSFHI Letter
ML16112A368
Person / Time
Site: Indian Point  Entergy icon.png
Issue date: 04/29/2016
From: Richard Rivera-Lugo
NRC/NRO/DSEA/RHMB
To:
References
Download: ML16112A368 (7)
v • d • e


Text

Indian Point Nuclear Generating Units 2 & 3 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 Not included in DB Not included in DB Not included in DB Flood Hazard Reevaulation Report (FHRR) Revision 2, Section 4.1.1 Failure of Dams and Onsite Water Control/Storage Structures REDACTED REDACTED REDACTED REDACTED REDACTED Streams and Rivers Probable Maximum Flood (PMF) on the Hudson River 12.7 ft NGVD29 1.0 ft 13.7 ft NGVD29 FHRR Revision 2, Section 2.3.1 and Table 4.1-1 PMF with Low Tide on the Hudson River 13.0 ft NGVD29 1.0 ft 14.0 ft NGVD29 FHRR Revision 2, Section 2.3.1 and Table 4.1-1 PMF with High Tide on the Hudson River 12.4 ft NGVD29 1.0 ft 13.4 ft NGVD29 FHRR Revision 2, Section 2.3.1 and Table 4.1-1 Storm Surge Probable Maximum Hurricane (PMH) with Spring High Tide on the Hudson River 13.5 ft NGVD29 1.0 ft 14.5 ft NGVD29 FHRR Revision 2, Section 2.3.1 and Table 4.1-1 Standard Project Hurricane and Standard Project Flood on the Hudson River 13.0 ft NGVD29 1.0 ft 14.0 ft NGVD29 FHRR Revision 2, Section 2.3.1 and Table 4.1-1 REDACTED REDACTED REDACTED REDACTED REDACTED REDACTED REDACTED REDACTED REDACTED REDACTED 1

Indian Point Nuclear Generating Units 2 & 3 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.

Seiche Not included in DB Not included in DB Not included in DB FHRR Revision 2, Section 4.1.5 Tsunami Not included in DB Not included in DB Not included in DB FHRR Revision 2, Section 4.1.6 Ice-Induced Flooding Not included in DB Not included in DB Not included in DB FHRR Revision 2, Section 4.1.7 Channel Migrations/Diversions Not included in DB Not included in DB Not included in DB FHRR Revision 2, Section 4.1.8 2

Indian Point Nuclear Generating Units 2 & 3 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 18.8 ft NGVD29 Minimal 18.8 ft NGVD29 Letter dated August 18, 2014, entitled "Revised FLO-2D Analysis to Address the Current LIP Regarding the Flooding Aspects of Recommendations 2.1 of the Near-Term Task Force Review of the Insights from the Fukushima Dai-ichi Accident Indian Point Units Nos. 2 and 3." ADAMS Accession No. ML16116A060 Unit 2 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U2-ABFP-2 18.8 ft NGVD29 Minimal 18.8 ft NGVD29 Unit 2 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U2-ABFP-3 19.1 ft NGVD29 Minimal 19.1 ft NGVD29 Unit 2 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U2-CB-1 18.3 ft NGVD29 Minimal 18.3 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-ABFP-1 18.5 ft NGVD29 Minimal 18.5 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-ABFP-2 18.6 ft NGVD29 Minimal 18.6 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-ABFP-3 18.8 ft NGVD29 Minimal 18.8 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-PAB-1 18.9 ft NGVD29 Minimal 18.9 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-PAB-2 19.2 ft NGVD29 Minimal 19.2 ft NGVD29 Unit 2 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U2-PAB-1 19.0 ft NGVD29 Minimal 19.0 ft NGVD29 Unit 2 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U2-ABFP-1 19.2 ft NGVD29 Minimal 19.2 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-CB-1 1

Indian Point Nuclear Generating Units 2 & 3 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism Stillwater Elevation Waves/

Runup Reevaluated Hazard Elevation Reference Streams and Rivers 16.5 ft NGVD29 2.1 ft 18.6 ft NGVD29 FHRR Rev. 2 (12/9/2014) Sections 3.4.2.5.1, 3.4.2.5.2, and FHRR (Rev.

12/10/2015) Section 6.2.2 Cool Season on Hudson River PMF with Snow Pack Coincident with 25-year Surge and 10%

Exceedance High Tide Failure of Dams and Onsite Water Control/Storage Structures REDACTED REDACTED REDACTED REDACTED REDACTED Storm Surge 18.9 ft NGVD29 2.9 ft 21.8 ft NGVD29 Letter dated April 5, 2016, entitled "Entergy Supplement to Basis for Performance of the Mitigating Strategies Assessment with the Flood Hazard Information and Report for Recommendations 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident ADAMS Accession No. ML16104A041 Combined Event with 150,000 cfs Flow in Hudson River Coincident with the Probable Maximum Storm Surge (PMSS), Including Antecedent Water Level (AWL) and Coincident Wind-Generated Waves (CWGW) - Values Reported in Open Water in River Outboard of River Bulkhead and U2 Intake Structure 18.9 ft NGVD29 2.1 ft 21.0 ft NGVD29 Combined Event with 150,000 cfs Flow in Hudson River Coincident with PMSS, Including AWL and CWGW - Values Reported in Open Areas of Powerblock Yard Between U2 Intake Structure and U2 Turbine Building 18.9 ft NGVD29 4.7 ft 23.6 ft NGVD29 Combined Event with 150,000 cfs Flow in Hudson River Coincident with PMSS, Including AWL and CWGW - Values Reported at River-facing Sides of Structures Between the River Bulkhead and the Turbine Buildings (Including West Sides of U2 and U3 Intake Structures) and River-facing (West) Side of U2 and U3 Turbine Buildings 2

Indian Point Nuclear Generating Units 2 & 3 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism Stillwater Elevation Waves/

Runup Reevaluated Hazard Elevation Reference Storm Surge (continued) 18.9 ft NGVD29 0.0 ft 18.9 ft NGVD29 Letter dated April 5, 2016, entitled "Entergy Supplement to Basis for Performance of the Mitigating Strategies Assessment with the Flood Hazard Information and Report for Recommendations 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident ADAMS Accession No. ML16104A041 Combined Event with 150,000 cfs Flow in Hudson River Coincident with PMSS, Including AWL and CWGW - Values Reported at Location East of U2 and U3 Turbine Buildings 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.

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.

3

Indian Point Nuclear Generating Units 2 & 3 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 Not included in DB Not included in DB Not included in DB Flood Hazard Reevaulation Report (FHRR) Revision 2, Section 4.1.1 Failure of Dams and Onsite Water Control/Storage Structures REDACTED REDACTED REDACTED REDACTED REDACTED Streams and Rivers Probable Maximum Flood (PMF) on the Hudson River 12.7 ft NGVD29 1.0 ft 13.7 ft NGVD29 FHRR Revision 2, Section 2.3.1 and Table 4.1-1 PMF with Low Tide on the Hudson River 13.0 ft NGVD29 1.0 ft 14.0 ft NGVD29 FHRR Revision 2, Section 2.3.1 and Table 4.1-1 PMF with High Tide on the Hudson River 12.4 ft NGVD29 1.0 ft 13.4 ft NGVD29 FHRR Revision 2, Section 2.3.1 and Table 4.1-1 Storm Surge Probable Maximum Hurricane (PMH) with Spring High Tide on the Hudson River 13.5 ft NGVD29 1.0 ft 14.5 ft NGVD29 FHRR Revision 2, Section 2.3.1 and Table 4.1-1 Standard Project Hurricane and Standard Project Flood on the Hudson River 13.0 ft NGVD29 1.0 ft 14.0 ft NGVD29 FHRR Revision 2, Section 2.3.1 and Table 4.1-1 REDACTED REDACTED REDACTED REDACTED REDACTED REDACTED REDACTED REDACTED REDACTED REDACTED 1

Indian Point Nuclear Generating Units 2 & 3 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.

Seiche Not included in DB Not included in DB Not included in DB FHRR Revision 2, Section 4.1.5 Tsunami Not included in DB Not included in DB Not included in DB FHRR Revision 2, Section 4.1.6 Ice-Induced Flooding Not included in DB Not included in DB Not included in DB FHRR Revision 2, Section 4.1.7 Channel Migrations/Diversions Not included in DB Not included in DB Not included in DB FHRR Revision 2, Section 4.1.8 2

Indian Point Nuclear Generating Units 2 & 3 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 18.8 ft NGVD29 Minimal 18.8 ft NGVD29 Letter dated August 18, 2014, entitled "Revised FLO-2D Analysis to Address the Current LIP Regarding the Flooding Aspects of Recommendations 2.1 of the Near-Term Task Force Review of the Insights from the Fukushima Dai-ichi Accident Indian Point Units Nos. 2 and 3." ADAMS Accession No. ML16116A060 Unit 2 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U2-ABFP-2 18.8 ft NGVD29 Minimal 18.8 ft NGVD29 Unit 2 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U2-ABFP-3 19.1 ft NGVD29 Minimal 19.1 ft NGVD29 Unit 2 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U2-CB-1 18.3 ft NGVD29 Minimal 18.3 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-ABFP-1 18.5 ft NGVD29 Minimal 18.5 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-ABFP-2 18.6 ft NGVD29 Minimal 18.6 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-ABFP-3 18.8 ft NGVD29 Minimal 18.8 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-PAB-1 18.9 ft NGVD29 Minimal 18.9 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-PAB-2 19.2 ft NGVD29 Minimal 19.2 ft NGVD29 Unit 2 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U2-PAB-1 19.0 ft NGVD29 Minimal 19.0 ft NGVD29 Unit 2 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U2-ABFP-1 19.2 ft NGVD29 Minimal 19.2 ft NGVD29 Unit 3 Transformer Yard Doors Maximum Water-Surface Elevation - Door ID U3-CB-1 1

Indian Point Nuclear Generating Units 2 & 3 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism Stillwater Elevation Waves/

Runup Reevaluated Hazard Elevation Reference Streams and Rivers 16.5 ft NGVD29 2.1 ft 18.6 ft NGVD29 FHRR Rev. 2 (12/9/2014) Sections 3.4.2.5.1, 3.4.2.5.2, and FHRR (Rev.

12/10/2015) Section 6.2.2 Cool Season on Hudson River PMF with Snow Pack Coincident with 25-year Surge and 10%

Exceedance High Tide Failure of Dams and Onsite Water Control/Storage Structures REDACTED REDACTED REDACTED REDACTED REDACTED Storm Surge 18.9 ft NGVD29 2.9 ft 21.8 ft NGVD29 Letter dated April 5, 2016, entitled "Entergy Supplement to Basis for Performance of the Mitigating Strategies Assessment with the Flood Hazard Information and Report for Recommendations 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident ADAMS Accession No. ML16104A041 Combined Event with 150,000 cfs Flow in Hudson River Coincident with the Probable Maximum Storm Surge (PMSS), Including Antecedent Water Level (AWL) and Coincident Wind-Generated Waves (CWGW) - Values Reported in Open Water in River Outboard of River Bulkhead and U2 Intake Structure 18.9 ft NGVD29 2.1 ft 21.0 ft NGVD29 Combined Event with 150,000 cfs Flow in Hudson River Coincident with PMSS, Including AWL and CWGW - Values Reported in Open Areas of Powerblock Yard Between U2 Intake Structure and U2 Turbine Building 18.9 ft NGVD29 4.7 ft 23.6 ft NGVD29 Combined Event with 150,000 cfs Flow in Hudson River Coincident with PMSS, Including AWL and CWGW - Values Reported at River-facing Sides of Structures Between the River Bulkhead and the Turbine Buildings (Including West Sides of U2 and U3 Intake Structures) and River-facing (West) Side of U2 and U3 Turbine Buildings 2

Indian Point Nuclear Generating Units 2 & 3 Table 2. Reevaluated Flood Hazards for Flood-Causing Mechanisms for Use in the MSA Mechanism Stillwater Elevation Waves/

Runup Reevaluated Hazard Elevation Reference Storm Surge (continued) 18.9 ft NGVD29 0.0 ft 18.9 ft NGVD29 Letter dated April 5, 2016, entitled "Entergy Supplement to Basis for Performance of the Mitigating Strategies Assessment with the Flood Hazard Information and Report for Recommendations 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident ADAMS Accession No. ML16104A041 Combined Event with 150,000 cfs Flow in Hudson River Coincident with PMSS, Including AWL and CWGW - Values Reported at Location East of U2 and U3 Turbine Buildings 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.

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.

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