ML14086A502

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Enclosure 1 to PNPS Letter 2.14.027 - Entergy Nuclear Engineering Report No. PNPS-RPT-11-00001, Re-assessment of Pilgrim Seismic Core Damage Frequency
ML14086A502
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Site: Pilgrim
Issue date: 06/13/2011
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Entergy Nuclear Operations
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2.14.027 PNPS-RPT-11-00001, Rev. 0
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ENCLOSURE I TO PNPS Letter 2.14.027 Entergy Nuclear Engineering Report No. PNPS-RPT-11-00001, "Re-assessment of Pilgrim Seismic Core Damage Frequency" June 2011

ENTERGY NUCLEAR Engineering White Paper Engineering Report No PNPS-RPT-1 1-00001 Rev. 0 ReAsssmn of Pilri Sesi Cor Damg Frequency

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SEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency TABLE OF CONTENTS 1.0 EXECUTIVE

SUMMARY

................................................................ 4 2 .0 P UR PO S E ................................................................................. 4 3 .0 B A C KG RO UND ........................................................................... 5 4.0 DEFINITIONS AND ACRONYMS ................................................... 6 4 .1 De fi n itio n s ..................................................... .................. 6 4 .2 A cro n yms ..................................................... ................... 7 5.0 GENERAL DISCUSSION ............................................................. 9 5.1 Assessment Approach ................................. 9 5.2 NRC Review Results ......................................................... 12 6 .0 E VA LU A T IO NS ........................................................................... 13 6.1 NRC Methodology in Determining SCDF ............................... 13 6.2 Methodology that Emulates NRC's Results ............................. 14 6.3 USGS Hazard Curves for PNPS ........................................... 15 6.4 Identification of Margin ........................................................ 16 6.4.1 Identification of Low Capacity Components ................. 16 6.4.2 In-Structure Response Spectra ................................. 23 6.4.3 Review of Capacities of Relays ............................... 23 6.4.4 Review of Capacities of Block Walls ........... ............ 25 6.4.5 Review of Capacities of Other Components .................. 26 6.4.6 Revised Fragilities ............................... 26 6.5 Re-Assessment of SCDF .................................................. 32

7.0 CONCLUSION

S ........................................................................ 34 8.0 RECOMMENDATIONS ................................................................. 34 8.1 Short term Recommendations ............................................ 34 8.2 Long term Recommendations ............................................. 34

9.0 REFERENCES

........................................................................... 35 10.0 ATTACHMENTS ............................................................................... 36 11.0 TEAM MEMBERS ....................................................................... 36 Sheet 3 of 36

SEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency 1.0 EXECUTIVE

SUMMARY

Recent NRC Safety/Risk Assessment of US Nuclear Plant Seismic Core Damage Frequencies based on the 2008 US Geological Survey (USGS) Seismic Hazard Curves used Pilgrim's Individual Plant Examination of External Events (IPEEE) [ 9.1]

information to perform risk assessments in support of reaching a resolution to GI-199.

The report identified Pilgrim Nuclear Power Station (PNPS) as the plant with the second-largest calculated Seismic Core Damage Frequency (SCDF). Since the Pilgrim IPEEE work included conservatisms, Entergy assembled a Seismic Review Team tasked with developing an SCDF estimate that more closely reflects the robustness of the Pilgrim Plant.

Although the NRC-estimated SCDF was below the target goal of 1.OE-04 per year, and thus acceptable in terms of the plant seismic risk, the review team re-assessed key PNPS components and demonstrated a larger plant-level seismic capacity than that used in the NRC assessment. The NRC used values for plant capacity extracted from the PNPS IPEEE report submitted in 1994. This resulted in the NRC determining a conservative SCDF estimate of 6.9E-05 per year, or 1 in 14,493 reactor-years. Using the improved plant level capacities developed by the team a re-assessment of the SCDF estimate was performed. This resulted in a SCDF of 3.98E-05 per year, or 1 in 25,126 reactor-years, using the same USGS Hazard Curves relied upon by NRC for the seismic risk assessment.

Using the improved plant level capacity developed by the review team and the EPRI updated 2010 Seismic Hazard Curves [9.12], the SCDF estimate is further reduced to 1.46E-05 per year (or 1 in 68,493 reactor-years).

2.0 PURPOSE The purpose of this Engineering Report is to provide an assessment relative to the seismic robustness of PNPS. A Seismic Review Team was therefore formed with an established main goal to re-assess the Seismic Core Damage Frequency (SCDF) for PNPS and demonstrate whether the actual PNPS SCDF value is in fact lower than the NRC reported estimate of 6.9E-05 per year. (SCDF, if not explicitly shown, is expressed in occurrences per year throughout this document).

Sheet 4 of 36

SEnterg ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency

3.0 BACKGROUND

During NRC's review of the Early Site Permit (ESP) applications for new nuclear plants, it appeared that the seismic hazard for operating plants in the Central and Eastern United States (CEUS) region may have increased for some sites. Based on the evaluations of the Individual Plant Examination of External Events (IPEEE) Program, the NRC had determined that seismic designs of operating plants in the CEUS provided an adequate level of protection. However, in light of the preliminary results from the review of ESP applications, the NRC also recognized that the probability of exceeding the Safe Shutdown Earthquake (SSE) at some of the currently operating sites in the CEUS may be higher than previously thought. Therefore, the NRC initiated Generic Issue GI-199 to assess the impact of increased estimates of seismic hazards on selected current nuclear power plants in the CEUS region that might be impacted by the updated seismic research, information, and models.

On 09/02/10, the NRC issued Safety/Risk Assessment (SRA) results for Generic Issue 199, "Implications of Updated Probabilistic Seismic Hazard Estimates in Central and Eastern United States on Existing Plants" [9.3]. The SRA consists of three separate evaluations performed using, respectively, the 1989 Electric Power Research Institute (EPRI), 1994 Lawrence Livermore National Laboratory (LLNL), and the updated 2008 U.S. Geological Survey (USGS) seismic hazard curves to calculate the SCDF for all U.S. nuclear plants. The results of the GI-199 assessment raised the possibility that the probability of exceeding the design basis ground motion may have increased at some sites, but only by a relatively small amount. The NRC concluded that "no concern exists regarding adequate protection and that the current seismic design of operating reactors provides a safety margin to withstand potential earthquakes exceeding the original design basis." However, since the changes in seismic core-damage frequency estimated in the Safety/Risk Assessment Stage of GI-199 for numerous plants lie in the range of 1.OE-04 per year to 1.OE-05 per year, NRC decided that the issue will proceed to the Regulatory Assessment Stage of the Generic Issues Program. It should be noted that the NRC-DOE-EPRI team is developing a new CEUS seismic source model, and the Senior Seismic Hazard Analysis Committee (SSHAC) Next Generation Attenuation (NGA) East project is developing a revised ground motion model.

The objective of the GI-1 99 Safety/Risk Assessment (SRA) was to perform a conservative, screening-level assessment to evaluate if further investigations of seismic safety for operating reactors in the CEUS are warranted consistent with NRC directives.

Sheet 5 of 36

SEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency The results of the GI-1 99 SRA should not be interpreted as definitive estimates of plant-specific seismic risk. The nature of the information used (both seismic hazard data and plant-level fragility information) make these estimates useful only as a screening tool.

The NRC does not rank plants by seismic risk.

NRC evaluation results showed PNPS as having the second-largest SCDF value of the U.S. nuclear plants (SCDF estimate of 6.9E-05 per year) using the 2008 updated USGS Seismic Hazard Curves [9.7] for the PNPS site. Note that this is still within the range considered acceptable in the NRC's process for evaluating emergent issues.

The NRC used information from the PNPS IPEEE [9.1] submittal to derive the plant-level fragility used to calculate the SCDF. Conservatism in the information could have resulted in an overly conservative (high) SCDF estimate.

As a result of the Tohoku-Taiheiyou-Oki Earthquake in Japan and its effect on the Fukushima Daiichi Nuclear Station, increased attention has been directed to nuclear plants [9.4, 9.6] and in particular PNPS's ability to withstand an earthquake without suffering core damage.

4.0 DEFINITIONS & ACRONYMS 4.1 Definitions

  • Composite Uncertainty (11) - The composite logarithmic standard deviation of the capacity about the best-estimate, or median value. It represents the variation due to both inherent randomness (Ar)and uncertainty (Pu).
  • Fragility - The conditional probability of failure as a function of a ground motion parameter (for example, peak ground acceleration).
  • High Confidence of a Low Probability of Failure (HCLPF) - The ground motion parameter (for example, peak ground acceleration) at which there is at least 95% confidence of less than 5% probability of failure (for example, core damage).
  • Median Capacity (Am or C50) - The ground motion parameter (for example, peak ground acceleration) for which there is a 50% probability of failure (for example, core damage).

Sheet 6 of 36

zEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency

  • Plant-Level Fragility - The probability of core damage as a function of the site earthquake-induced vibratory ground motion.
  • Seismic Core Damaae Frequency (SCDF) - The expected frequency of core damage caused by earthquake ground motion (expressed as occurrences per reactor-year) for a nuclear power plant at a specific location.
  • Seismic Hazard Curve - The annual frequency at which the site earthquake-induced vibratory ground motion exceeds a given value of a ground motion parameter (for example, peak ground acceleration)
  • Seismic Hazard Map - A seismic hazard map displays an earthquake ground motion parameter (for example, peak ground acceleration) for a specific probability of occurrence at many locations (for example, across the United States). Seismic hazard maps are derived from seismic hazard curves calculated for a grid of sites across the United States.

" Surrogate Element - Element used to represent all of the components with relatively high seismic capacity.

  • Uniform Hazard Spectrum (UHS) - A plot of the maximum acceleration of a single-frequency system over a range of frequencies for a ground motion with a specific probability of occurrence.

4.2 Acronyms

" ATWS - Anticipated Transient Without Scram

" BE - Basic Event

" CAV - Cumulative Absolute Velocity

" CDF - Core Damage Frequency

" CDFM - Conservative Deterministic Failure Margin

" CEUS - Central and Eastern United States

  • EPRI - Electric Power Research Institute
  • ESP - Early Site Permit Sheet 7 of 36

cý-Enterg ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency

" GERS - Generic Equipment Ruggedness Spectra

  • GI - Generic Issue
  • GIP - Generic Implementation Procedure
  • GMI - Ground Motion Incoherence
  • GMRS - Ground Motion Response Spectrum
  • GSI - Generic Safety Issue
  • HCLPF - High Confidence of a Low Probability of Failure
  • IPEEE - Individual Plant Examination of External Events
  • ISRS - In-Structure Response Spectra

" LLNL - Lawrence Livermore National Laboratory.

" LOCA - Loss of Coolant Accident

  • NGA - Next Generation Attenuation
  • NRC - US Nuclear Regulatory Commission
  • PGA - Peak Ground Acceleration
  • PNPS - Pilgrim Nuclear Power Station

" PRA - Probabilistic Risk Assessment

  • PSD - Power Spectral Density
  • RBCCW - Reactor Building Closed Cooling Water
  • SBO - Station Blackout Sheet 8 of 36

'Entergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency

  • SCDF - Seismic Core Damage Frequency
  • SEWS - Screening Evaluation Worksheet
  • SHIP- Seismic Hazard Integration Package
  • SMA - Seismic Margins Assessment
  • SRA - Safety/Risk Assessment
  • SSHAC - Senior Seismic Hazard Analysis Committee
  • UHS - Uniform Hazard Spectra
  • USI - Unresolved Safety Issue
  • USGS - U.S. Geological Survey

" ZPA - Zero Period Acceleration 5.0 GENERAL DISCUSSION 5.1 Assessment Approach The team effort consisted of completing the following:

" Understanding the current seismic risk to the station, in terms of SCDF.

  • Identifying potential conservatisms within the PNPS IPEEE submittal information used by the NRC in the SCDF calculation.

" Exploring and, where appropriate, removing conservatisms in the IPEEE component fragility values. The plant-level fragility value is expected to increase.

" Exploring, and where appropriate, reducing conservatism in the USGS Seismic Hazard Curves. For example, the USGS seismic hazard calculations did not include Cumulative Absolute Velocity (CAV) filtering and ground motion incoherence, which tend to reduce the acceleration values.

Sheet 9 of 36

SEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Using the original seismic PRA computer model Seismic Hazard Integration Package (SHIP) to estimate a more realistic SCDF using revised fragilities, revised risk significant random failure probabilities, revised operator action failure probability to align suppression pool cooling and removal of Reactor Building quad coolers requirements (for RHR A/B quadrant, CRD quadrant, and HPCI room) in the SPRA model. It should be noted that the 2002 GOTHIC calculation [9.5] showed that the function of RHR pumps A/B/C/D, CRD pumps and HPCI were not impacted by the loss of their respective area coolers during the mission time. Table 5.1 below provides a summary of these changes - (See Attachment 10.7).

  • Fully understanding the methodology used by NRC in developing the SCDF estimates reported in [9.3], and subsequently, developing a method that emulates the NRC's approach and duplicates the NRC results, as described in Attachment 10.2. This methodology was used to obtain revised SCDF estimates based on the peak ground acceleration (PGA) and the 10 Hz, 5 Hz, and 1 Hz hazard curves. The revised SCDF reflected changes in seismic fragilities, random failure probabilities, operation action failure probabilities, or system modeling changes as described in the previous bullet above.
  • Developing recommendations for short-term and long-term actions to improve the seismic risk estimates to more accurately reflect the robustness of the plant.

Sheet 10 of 36

SEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Table 5.1 Summary of Pilgrim SPRA Basic Events Changes Basic Event Descrtion Probability (3)

Name Old (1) New EPTHPCIXXR HPCI Pump Fail to Run 1.96E-02 3.93E-03 (2)

IPTRCICXXS RCIC Pump Fail to Start 3.33E-02 3.33E-03 (2)

HSYHPCIMNU HPCI unavailable due to maintenance 2.54E-02 1.21 E-02 (2)

ILPRCICMNU RCIC unavailable due to maintenance 3.55E-02 8.74E-03 (2)

EPTRCICXXR RCIC Pump Fail to Run 1.96E-02 9.78E-03 (2)

HVMMO3XXXN HPCI steam admission valve fails to open 1.30E-02 1.03E-03 (2)

SPMALLXCCS Common cause failure of all SSW pumps to start 7.OOE-04 1.63E-05 (2)

HPTHPCIXXS HPCI pump fail to start 6.11E-03 3.33E-03 (2)

HPTHPRCCCR Common cause failure of HPCI & RCIC pumps to run 3.56E-04 2.31 E-07 (2)

HPMAUXOILS HPCI aux oil pump fail to start 3.OOE-03 3.33E-03 (2)

HPTHPRCCCS Common cause failure of HPCI & RCIC pumps to start 3.90E-04 3.46E-05 (2)

ADLGEBXXXU B DG out for corrective maintenance 1 .18E-02 1.09E-02 (2)

EFN201ABXZ HPCI ROOM COOLING FANs VAC201A/B FAILURE 1.23g 2.00g (4)

EFN202ABXZ VAC202A&B FAIL RBCCW PRESSURE BOUNDARY 1.23g 2.00g (4)

EFN203ABXZ CRD QUAD ROOM COOLING FANS VAC 203A/B FAILURE 1.23g 2.00g (4)

EFN204ABXZ QUAD ROOM COOLER FANs 204A/B FAILURE 0.61g 2.00g (4)

EFN204CDXZ QUAD ROOM COOLER FANs 204C/D FAILURE 0.61g 2.00g (4)

EFN207A-DZ VAC207A-D FAILS RBCCW PRESSURE BOUNDARY 1.01g 2.00g (4)

EFNDWCOOLZ FAILURE OF VAC205 OR 206 FAMILY OF FAN COOLERS 1.06g 2.00g (4)

ERE159X9!Z SEISMICALLY CORR RELAY CHATTER OF 159-509 & 609 0.55g 2.22g (5)

ERE132X9!Z SEISMICALLY CORR RELAY CHATTER OF 132-509 & 609 0.55g 1.50g 05)

EBW209/OXZ BLOCK WALL 209.0 FAILS 0.82g 2.00g (5)

EBDDGBLDXZ DIESEL GENERATOR BUILDING FAILS 0.77g 1.04g (5)

EBW45/3XXZ BLOCK WALL 45.3 FAILS 1.07g 2.00g (5)

EBSB2XXXXZ SEISMICALLY INDUCED FAILURE OF BUS B2 0.84g 1.13g (5)

EPM184AXXZ BODG FUEL OIL PUMP P184 FAILURE 1.05g 1.42g (5)

ECMK103ABZ DIESEL STARTING AIR COMPRESSORS 1.28g 1.73g (5)

EPM141ABXZ DIESEL FUEL OIL PUMPS P-141A/B FAILURE 1.28g 1.73g (5)

EVPEABXXXZ DG A&B FUEL OIL PRESSURE REG VALVE E FAILURE 1.28g 1.73g (5)

EVRCABXXXZ DG A&B FUEL OIL RELIEF VALVE C FAIL 1.28g 1.73g (5)

EVS4565CDZ DIESEL AIR PSV4565C AND D SEISMIC COR FAILURE 1.28g 1.73g (5)

ETKT105ABZ CSTs T105A/B FAILURE 0.94g 1.27g 5 )

EBW195/23Z BLOCKWALL 195.23 FAILS 1.00g 2.00g (5)

Sheet 11 of 36

SEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency ETK105ABNZ CST 105 A/B FAILS DUE TO N2 TANK INTERACTION 0.16g 5.00g 151 ESPCOOLXXY OPERATOR FAILS TO INITIATE SPC WHEN REQUIRED 5.0E-01 5.OE-02 ()

Notes to Table 5.1:

(1) Probability based on original SHIP input file PILRUN1.CMP.

(2) Revised data reflects updated Basic Event (BE) data from PNPS_07_maint.rr dated 12/16/2009. [9.18]

(3) Entries expressed in terms of "g" denote median capacity used to calculate CDF.

(4) GOTHIC calculation (Reference 9.5) showed that the function of RHR pumps A/B/C/D, CRD pumps and HPCI were not impacted by the loss of RHR Loop A/B quad coolers during the mission time. Hence, a value of 2.Og is assumed for median seismic capacity.

(5) Based on revised seismic fragility calculation from Attachment 10.4.

(6) Human error probability reflects more realistic value for higher accelerations.

5.2 NRC Review Results The results of the NRC analysis described in Section 6.1, for PNPS are summarized below Table 5.2:

Table 5.2 NRC Results for SCDF SEISMIC CORE DAMAGE FREQUENCY INCREASE INCREASE PLANT WEAKEST LINK 2008 USGS 1989 EPRI 1994 LLNL USGS-EPRI USGS-LLNL PNPS 6.9E-05 8.OE-06 1.1E-04 6.1E-05 -4.1E-05 1 in 14,500 yrs 1 in 125,000 yrs 1 in 9,091 yrs The NRC acknowledges [9.3] that "The results of the GI-199 safety risk assessment should not be interpreted as definitive estimates of plant-specific seismic risk because some analyses were very conservative making the calculated risk higher than in reality".

The 1989 EPRI and 1994 LLNL results for PNPS are quite different. The difference in SCDF is positive for USGS-EPRI and negative for USGS-LLNL.

Sheet 12 of 36

SEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency As a result of the GI-199 SRA, the NRC compiled a list of 27 plants requiring further review. PNPS is not among those selected plants, due to the negative USGS-LLNL change in SCDF. The criteria used for selection by NRC are described in Attachment 10.1.

6.0 EVALUATIONS 6.1 NRC Methodology in Determining SCDF The SCDF is calculated as:

SCDF = fPa _ clk where P(a) is the plant-level fragility function and H(a) is the seismic hazard curve. The equation is evaluated numerically.

The fragility function used by the NRC was characterized by a median capacity, Am, and a composite uncertainty, Pc. The NRC derived these parameters from the IPEEE submittals for each plant. The submittal information varied from plant to plant; therefore, the NRC used different methods for different plants. The different methods are defined in Table C-1 of Appendix C of [9.3]. The method used for each plant is listed in Table C-2 of Appendix C of [9.3].

The method used for PNPS was supposed to take the median capacity, C50 , and HCLPF from the IPEEE submittal and calculate Pc as 13c = ln(C 5o/HCLPF)/2.33.

" The NRC lists 0.49g for median capacity, C50 , in Table C-2. The number given in Table 3-13 of the PNPS IPEEE submittal [9.1] is 0.48g.

  • The NRC lists 0.27 for composite uncertainty, Pc in Table C-2. The PNPS HCLPF is listed as 0.25g in Table 3-13. Using C50 = 0.48g and HCLPF = 0.25g gives Pc = 0.28. Using C50 = 0.49g and HCLPF = 0.25g gives Pc = 0.29. Neither of these is the same as 0.27. Use of C50 = 0.49g and Pc = 0.27 give HCLPF =

0.26g.

Sheet 13 of 36

SEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency It is surmised that the NRC adjusted the fragility parameters to get agreement with PNPS IPEEE reported SCDF when using the 1989 EPRI PGA Seismic Hazard Curve.

See Attachment 10.2 for more discussion.

For seismic hazard input the NRC used three sets of seismic hazard curves: USGS 2008, EPRI 1989 and LLNL 1993. Each set had individual hazard curves for PGA, 10 Hz, 5 Hz and 1 Hz. For a given set the NRC calculated the SCDF corresponding to each curve. The highest SCDF calculated was used as the plant SCDF corresponding to the set of curves (the "weakest link approach"). The SCDFs for each plant and for each set of curves are presented in Tables D-1, D-2 and D-3 of Appendix D of [9.3].

The "weakest link" SCDF for PNPS for the USGS 2008 seismic hazard is listed in Table D-1 of the GI-199 SRA [9.3] as 6.9E-05 per year. The corresponding "weakest link" SCDFs for the EPRI 1989 hazard and LLNL 1993 hazard are 8.OE-06 and 1.1 E-04, respectively. The NRC then used the differences between the SCDF for the USGS 2008 hazard and the SCDFs for the EPRI 1989 and LLNL 1994 hazards to select plants for further review. PNPS was not selected because the SCDF based on the USGS 2008 seismic hazard is lower than the SCDF for the LLNL 1993 Seismic Hazard Curve.

The fragility information from the IPEEE submittals was in general characterized in terms of PGA. In order to calculate the SCDF for the 10 Hz, 5 Hz or 1 Hz Seismic Hazard Curves, the fragilities must be changed to be in terms of the spectral acceleration at that frequency. This was done by multiplying the median capacity acceleration, C50 , by a spectral ratio, m. The spectral ratios for all of the plants are given in Table C2 of Appendix C of the GI-199 SRA [9.3] (and are also discussed in Attachment 10.2).

6.2 Methodology That Emulates NRC's Results A full understanding of the methodology used in the NRC report was achieved. The NRC SRA results were duplicated, validating our understanding. The same methodology was used to develop the more realistic estimates of SCDF.

The methodology developed for calculating SCDF for a given hazard curve and fragility was derived and used in conjunction with the USGS Seismic Hazard Curves for which the acceleration interval was refined using a log-log interpolation between the raw Sheet 14 of 36

SEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency acceleration data points for a 0.001g interval. Excerpts from the SCDF analyses for the PGA, 10 Hz, 5 Hz, and 1Hz Hazard Curves showing the 0.001g discretization for each hazard curve are presented in Attachments 10.2 and 10.5.

The SCDF results obtained using the methodologydescribed above, with the USGS Hazard Curve and PNPS fragility used by the NRC, match those reported in the NRC GI-199 SRA. This same methodology was then used in the SCDF calculation estimates that more accurately reflect the robustness of the PNPS components as outlined in Attachments 10.3 and 10.5.

6.3 USGS Hazard Curves for PNPS In developing the SCDF estimates, the NRC SRA indicates that the PNPS Seismic PRA (SPRA) was used to establish plant-level fragility curve parameters. This plant-level fragility was then convolved with Seismic Hazard Curves derived by the United States Geological Survey (USGS) for the PNPS plant site. The curves were obtained from NRC [9.7]. The curves as transmitted by NRC are contained in Attachment 10.6.

Current NRC guidance for the estimation of design ground motions for new plants (Regulatory Guide 1.208 [9.8]) allows for a period and amplitude-dependent reduction in event frequency to represent the observation that some fraction of earthquake ground motions of a given amplitude fall below the threshold of damage for most engineered structures. One measure of this threshold is the cumulative absolute velocity (CAV) value. The USGS hazard analysis did not include the CAV threshold effect [9.3]. It is believed that if the CAV threshold effect were to be incorporated in the seismic hazard analysis, the hazard curves would be lowered and the SCDF would decrease as a result. However, it is not possible to incorporate the effect within the scope of this assessment beyond calculating SCDF values using the EPRI Seismic Hazard Curves.

EPRI performed an independent seismic hazard analysis. The results have not been publicly released, but EPRI provided its hazard results to Entergy. These hazard analysis included consideration of the CAV threshold effect. Therefore, SCDF calculations will also be done using the EPRI updated curves [9.12] for comparison to the SCDF calculations using the USGS curves.

Sheet 15 of 36

SEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency 6.4 Identification of Margin 6.4.1 Identification of Low Capacity Components In Section 3.1.5.5 of the PNPS IPEEE submittal [9.1], the mean core damage frequency (CDF) due to a seismic event is reported to be 5.8E-05 per year. The dominant core damage sequence is a seismic-induced loss-of-offsite power (LOSP) and the subsequent loss of reactor pressure vessel (RPV) injection. This sequence contributes 2.72E-05 per year, or 46.7% of the total seismic CDF. Important contributors are relay chattering failures associated with both emergency diesel generators (EDG) and the SBO diesel. Other contributors are loss of the condensate storage tank (due to system interaction with the nitrogen supply tank) and diesel generator building structural failure.

In addition to seismic related faults, non seismic failures that contribute to this sequence involve operator action failure to reset SBO diesel-related relays and failure to complete SBO diesel start procedure.

The second-highest sequence contributing to the seismic CDF involves LOSP and failure to provide containment decay heat removal. This sequence contributes 2.09E-05 per year, or 35.9% of the total seismic CDF. The loss of containment decay heat removal involves failure of the RHR system or failure of systems that support the RHR system (these include loss of RHR pumps quadrant room cooling, Reactor Building Closed Cooling Water (RBCCW) system surge tank and pumps failures, SSW pumps failure, seismic-induced block wall system interaction failure (block walls 209.0 or 45.3),

or seismically-induced failure of bus B2. In addition to seismic-related faults, non-seismic failures that contribute to this sequence involve operator action failure to align for suppression pool cooling and failure to complete SBO diesel start procedure.

The third and fourth dominant sequences involve the occurrence of a small break LOCA and subsequent loss of RPV injection or containment decay heat removal. These sequences contribute 5.90E-06 per year, or 10.1% of the total seismic CDF. These sequences are identical to dominant seismic sequence one and two above except for the occurrence of small break LOCA and involve the occurrence of small LOCA and subsequent loss of RPV injection or containment decay heat removal.

With consideration of the above seismic sequences, seven types of seismic-induced accidents dominate the seismic core damage frequency: loss of makeup at high RPV pressure, loss of containment heat removal, small LOCA with high pressure makeup Sheet 16 of 36

SEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency failure, small LOCA with containment control failure, surrogate element (element representing all components with relatively high seismic capacity), vessel rupture, and anticipated transient without scram (ATWS). Their mean contributions to the seismic core damage frequency for events up to seismic failure of the surrogate element are summarized below in Table 6.1:

Table 6.1 Events and Contribution to SCDF from IPEEE Seismic Accident Initiating Key Seismic Contributing Per year Mean Contribution Sequence Event(s) Components CDF to SCDF LOSP/Loss of Electrical faults, seismic 1 interactions, and DG 2.72E-05 46.7 %

building failure Pumps (RHR, RBCCW, and 2 LOSP/RHR SSW), RBCCW surge tank, 2.09E-05 35.9 %

and Electrical faults 3 SmallLOCAs Same as above sequences 5.90E-06 10.1 %

1&2 4 Seismic Failure of Surrogate 1.64E-06 2.8 %

From a review of the contribution to SCDF, it is evident that the sequences associated with loss of RPV injection (SITQU) resulted in a significant risk contribution. As a result, components associated with the SITQU were identified as requiring review to determine if conservatisms existed in the calculation of their fragility values. This was done by reviewing Table 3-15 of the PNPS IPEEE submittal [9.1], which summarizes important seismic faults.

To broaden the review additional components were selected associated with other sequences which resulted in significant risk contribution to the SCDF, and with IPEEE-calculated fragility levels below the surrogate element. In this approach a selection of the low capacity components were reviewed to ascertain if conservatisms exist, and if the findings, on a sample basis, are applicable to the remaining low capacity components with fragility levels below the surrogate element value.

Sheet 17 of 36

!t-Entergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency The SHIP model was run with successive change to the median capacity of each of the components in the model with a median capacity lower than the surrogate. The median capacity was increased to 2g to reflect the component seismic contribution to risk without having to modify the SHIP model, and the model was run to calculate a new SCDF. The reduction in SCDF was recorded. The components were then ranked in order of the percentage reduction in SCDF attributable just to reduced conservatism in that one component fragility. The results are shown in Table 6.2 below.

Table 6.2 Components Ranked by Potential Reduction in SCDF Number Component Median Beta-C HCLPF Component Revised  %

Name Description SCDF Change 5 E0.55X0.143LOSS OF OFFSITE 3.45E-06 94.072 POWER QUAD ROOM 28 EFN204ABXZ 0.61 0.46 0.286 COOLER FANs 5.16E-05 11.340 204A1B FAILURE QUAD ROOM 29 EFN204CDXZ 0.61 0.46 0.286 COOLER FANs 5.21 E-05 10.481 204C/D FAILURE SEISMICALLY 3 ERE18781!Z 0.25 0.597 0.065 INDUCED5.24E-05 9.966 CHATTER OF RELAY 187-801A SEISMICALLY CORRELATED 6 ERE132X9!Z 0.55 0.597 0.142 RELAY CHATTER 5.35E-05 8.076 OF 132-509 AND 609 SEISMICALLY CORRELATED 7 ERE159X9!Z 0.55 0.597 0.142 RELAY CHATTER 5.35E-05 8.076 OF 159-509 AND 609 (1 AND 2) 36 EBW209/OXZ 0.82 0.46 0.384 BLOCK WALL 209.0 5.37E-05 7.732 FAILS DIESEL 35 EBDDGBLDXZ 0.77 0.46 0.36 GENERATOR 5.38E-05 7.560 BUILDING FAILS 45 EBW45/3XXZ 1.07 0.46 0.501 5.39E-05 7.388 FAILS 33 EBSA8XXXXZ 0.96 0.47 0.323 A8 BUS FAILURE 5.40E-05 7.216 SEISMICALLY 37 EBSB2XXXXZ 0.84 0.46 0.393 INDUCED FAILURE 5.40E-05 7.216 1___ _ 1_ 1__

OF BUS B2 Sheet 18 of 36

' Entergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Number Component Median Beta-C HCLPF Component Revised  %

Name Description SCDF Change BODG FUEL OIL 43 EPM184AXXZ 1.05 0.46 0.492 PUMP P184 5.44E-05 6.529 FAILURE SEISMICALLY 13 ERE16059!Z 0.89 0.597 0.23 CORRELATED 5.45E-05 6.357 RELAY CHATTER OF 160-509 SEISMICALLY 14 ERE18159Z 0.89 0.597 0.23 INDUCED5.45E-05 6.357 CHATTER OF RELAY 181-509 SEISMICALLY 15 ERE18759!Z 0.89 0.597 0.23 INDUCED5.45E-05 6.357 CHATTER OF RELAY 187-509 SEISMICALLY 16 ERE27A5X!Z 0.89 0.597 0.23 INDUCED5.45E-05 6.357 CHATTER OF RELAY 127-A5X SEISMICALY INDUCED DIESEL 32 EDLGEABXXZ 1.39 0.654 0.32 GENERATOR A/B 5.45E-05 6.357 CORELATED FAILURE VAC207A-D FAILS 42 EFN207A-DZ 1.01 0.46 0.473 RBCCW5.45E-05 6.357 PRESSURE BOUNDARY SEISMICALLY 23 ERE15169Z 1.04 0.597 0.269 INDUCED5.46E-05 6.186 CHATTER OF 151V-609/A,B,C SEISMICALLY 24 ERE16069!Z 1.04 0.597 0.269 CORRELATED 5.46E-05 6.186 RELAY CHATTER OF 160-609 SEISMICALLY 25 ERE18169!Z 1.04 0.597 0.269 INDUCED5.46E-05 6.186 CHATTER OF RELAY 181-609 SEISMICALLY 26 ERE18769Z 1.04 0.597 0.269 INDUCED5.46E-05 CHATTER OF 6.186 RELAY 187-609 SEISMICALLY 27 ERE27A6X!Z 1.04 0.597 0.269 INDUCED5.46E-05 6.186 CHATTER OF RELAY 127-A6X Sheet 19 of 36

,..Enterg ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Number Component Median Beta-C HCLPF Component Revised  %

Name Description SCDF Change FAILURE OF VAC205 OR 206 44 EFNDWCOOLZ 1.06 0.46 0.496 OF FAN FAMILY OF 5.46E-05 6.186 COOLERS SEISMICALLY 17 ERE32801Z 1 0.597 0.258 5.47E-05 6.014 CHATTER OF RELAY 132-801A SEISMICALLY 18 ERE51N81Z 1 0.597 0.258 INDUCED5.47E-05 6.014 CHATTER OF RELAY 151N-801A SEISMICALLY INDUCED 19 ERE51NG8!Z 1 0.597 0.258 CHATTER OF 5.47E-05 6.014 RELAY 151NG-801A SEISMICALLY 20 ERE51V81!Z 1 0.597 0.258 INDUCED5.47E-05 6.014 CHATTER OF RELAY 151V-801A SEISMICALLY 21 ERE59801!Z 1 0.597 0.258 INDUCED5.47E-05 6.014 CHATTER OF RELAY 159-801A SEISMICALLY CORRELATED 31 ERE2352X!Z 1.2 0.597 0.31 RELAY CHATTER 5.47E-05 6.014 OF 23A-K52A AND B

HPCI ROOM 46 EFN201ABXZ 1.23 0.46 0.576 COOLING FANs 5.47E-05 6.014 VAC201A/B FAILURE VAC202A&B FAIL 47 EFN202ABXZ 1.23 0.46 0.576 RBCCW5.47E-05 6.014 PRESSURE BOUNDARY CRD QUAD ROOM 48 EFN203ABXZ 1.23 0.46 0.576 COOLING VAC 203A/BFANS 5.47E-05 6.014 FAILURE DIESEL STARTING AIR 49 ECMK103ABZ 1.28 0.46 0.599 5.47E-05 6.014 K103A/B CORRELATED I _ FAILURE Sheet 20 of 36

'Entergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Number Component Median Beta-C HCLPF Component Revised  %

Name Description SCDF Change DIESEL FUEL OIL 50 EPM141ABXZ 1.28 0.46 0.599 PUMPS P-141A/B 5.47E-05 6.014 FAILURE DG A & B SEIS 51 EVPEABXXXZ 1.28 0.46 0.599 CORREL FUEL OIL 5.47E-05 6.014 PRESSURE REG VALVE E FAILURE DG A & B SEISMICALLY 52 EVRCABXXXZ 1.28 0.46 0.599 CORRELATED 5.47E-05 6.014 FUEL OIL RELIEF VALVE C FAIL DIESEL AIR PSV4565C AND D 53 EVS4565CDZ 1.28 0.46 0.599 SEISMIC 5.47E-05 6.014 CORRELATION FAILURE SEISMICALLY CORRELATED 22 ERE12769!Z 1.04 0.597 0.269 CHATTER OF 5.48E-05 5.842 RELAY 127-609 AND 159N-609 SEISMICALLY 30 ERE1425B!Z 1.14 0.597 0.295 INDUCED5.48E-05 5.842 CHATTER OF 420-1846 SEISMICALLY 34 ERE18681Z 1.34 0.597 0.346 INDUCED5.48E-05 5.842 CHATTER OF RELAY 186-801A SEISMICALLY 38 ERE2759X!Z 1.55 0.597 0.401 INDUCED5.48E-05 5.842 CHATTER OF 127-509X 39 ETKT105ABZ 0.94 0.46 0.44 5.48E-05 5.842 FAILURE 40 EBW21O/OXZ 1.65 0.572 0.441 BLOCK WALL 210.0 5.48E-05 5.842 FAILS 41 EBW195/23Z 1 0.46 0.468 BLOCKWALL 5.48E-05 5.842 195.23 FAILS CST 105 A/B FAILS 4 ETK105ABNZ 0.16 0.46 0.075 DUE TO N2 TANK 5.77E-05 0.859 INTERACTION SEISMICALLY 8 ERE40801!Z 0.67 0.597 0.173 INDUCED5.79E-05 0.515 CHATTER OF RELAY 140-801A Sheet 21 of 36

SEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Number Component Median Beta-C HCLPF Component Revised  %

Name Description SCDF Change SEISMICALLY 9 ERE46801Z 0.67 0.597 0.173 INDUCED5.79E-05 0.515 CHATTER OF RELAY 146-801A SEISMICALLY 10 ERE1865X!Z 0.73 0.597 0.189 INDUCED5.80E-05 0.344 CHATTER OF RELAY 181-5X SEISMICALLY 12 ERE15159Z 0.89 0.597 0.23 INDUCED5.80E-05 0.344 CHATTER OF 151V-509/A,B,C SEISMICALLY 1 EISLOCACSZ 0 0.46 0 INDUCED CORE 5.82E-05 0.000 SPRAY PIPE RUPTURE SEISMICALLY 2 EISLOCRHRZ 0 0.46 0 INDUCED RHR 5.82E-05 0.000 PIPING RUPTURE SEISMICALLY CORRELATED 11 ERE12759!Z 0.89 0.597 0.23 CHATTER OF 5.82E-05 0.000 RELAY 127-509 AND 159N-509 54 EBW198/1XZ 3.43 0.792 0.607 5.82E-05 0.000 FAILS BLOCK WALL 198.2 55 EBW198/2XZ 3.43 0.792 0.607 FLS FAILS 5.82E-05 0.000 SURROGATE ELEMENT FOR 56 ESURROGATZ 1 0.3 0.61 "L OH R "ALL OTHER" I___

_SEISMIC

_ FAILURE I _ I The first component in the list is LOSS OF OFFSITE POWER. The fragility for this is a generic fragility and cannot be modified without a significant amount of work, which is beyond the scope of this re-assessment. The next two components, QUAD ROOM COOLER FANs 204A/B FAILURE and QUAD ROOM COOLER FANs 204C/D FAILURE are no longer required to be in the model [9.5] (note that EFN201ABXZ and EFN203ABXZ--CRD quad coolers and HPCI room coolers are also not required).

Therefore, these components were not examined further.

The fragility calculations for the remaining components were examined to see if conservatism could be removed, which would result in a higher median capacity. These Sheet 22 of 36

eEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency reviews focused on conservatism in seismic demand and conservatism in seismic capacity. The main source of conservatism in seismic demand would be in the in-structure response spectra. This is discussed in Section 6.4.2. Conservatism in seismic capacity is discussed in Sections 6.4.3 to 6.4.5. Calculations of revised fragilities removing conservatism are contained in Attachment 10.4.

6.4.2 In-Structure Response Spectra To determine component seismic response within a structure, floor response spectra are typically generated. The generation of the floor response for the PNPS SPRA is described in Section 3.1.4.3 of the PNPS IPEEE submittal [9.1]. For PNPS, floor response spectra based on design ground input spectra were generated as part of the original plant design. Within the PNPS IPEEE assessment to develop component capacity, in-structure response spectra (ISRS) were calculated using median-centered soil-structure interaction analysis with the 1989 LLNL [9.11] uniform hazard spectral shape with a 1.0E-04 exceedance probability and anchored to 0.4g peak ground acceleration as input, was used in accordance with NUREG 1407 [9.10]. Structural damping was set to 7% in accordance with the recommendation of EPRI NP-6041 [9.2].

The floor response spectra generation and soil-structure interaction analysis were performed generally in accordance with NRC Standard Review Plan requirements, except that certain limitations were not applied. This is reasonable since the structural response calculations should be median-centered rather than conservative. The review team assessed that the ISRS generation approach did not result in over-estimation of in-structure floor amplification. Thus, this was not pursued further as a source of conservatism in the SCDF.

6.4.3 Review of Capacities of Relays Many of the components in the list, including the top three with potential for risk reduction, are relays. The relay fragilities were calculated in Stevenson & Associates Calculation C-015 [9.13]. C-015 states that the relay list with GERS capacities was provided by PNPS in a spreadsheet. This spreadsheet has not been located, and the GERS values used have not been independently verified by the review team. Some of the relays, including most of those in the Table 6.2 above, did not have GERS. The fragilities for these relays were calculated assuming the relays would eventually be shown to meet the minimum capacity for USI A-46 [9.17]. The documentation demonstrating this has not been located. Therefore, these fragilities have not been I

Sheet 23 of 36

SEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency changed. If these relays were indeed seismic verified in the USI A-46 program, the capacities may potentially be increased since it is likely the relay capacity would exceed the minimum required to meet the USI A-46 acceptance criteria.

The methodology for calculating the median fragility is described in calculation C-015

[9.13]. The methodology does not contain excess conservatism. Using various intermediate scaling factors based on EPRI TR-103959 [9.9], two factors are determined which give the median capacity as a factor times the GERS 4-16 Hz spectral acceleration, and as a factor times the GERS Zero Period Acceleration (ZPA) acceleration. The factors depend on the type of cabinet containing the relay and the location of the cabinet in the plant. The lower of the two products is used for the final median capacity. While the methodology is correct, the actual values used in the scale factor calculations have not been independently verified because the spreadsheet has not been located.

Table 6.3 below shows the relay fragilities with a potential significant impact on the SCDF. It gives the basis for the median capacity. The value of 0.6 for Beta-c is a standard value for relay fragilities.

Table 6.3 Relay Fragilities Name Median Beta- Component PANEL LOC GERS GERS Am Am MAKE MODEL C Description 4-16 ZPA PEAK ZPA ERE18781!Z 0.25 0.60 187-801A A8 GND 1.80 0.75 0.33 0.25 GE 12CFD22B1A 132-509 ERE132X9!Z 0.55 0.60 A AND 609 609 C101 DG23 W CRN-1 159-509 ERE159X9!Z 0.55 0.60 AND 609 C101 DG23 GE AND 609 SV ERE16059!Z 0.89 0.60 160-509 A5 TB37 GE 12CFVB11A3A ERE1 81592Z 0.89 0.60 181-509 A5 TB37 GE 121JF52A45 ERE18759!Z 0.89 0.60 187-509 A5 TB37 W SA-1 ERE27A5X!Z 0.89 0.60 127-A5X A5 TB37 GE 12HFA51A42H 151 V-ERE15169!Z 1.04 0.60 151,,

609/A,B,C A6 TB23 GE 121J CV52A9A ERE16069!Z 1.04 0.60 160-609 A6 TB23 GE 12CFVB11A3A ERE18169!Z 1.04 0.60 181-609 A6 TB23 GE 121JF52A4A ERE18769Z 1.04 0.60 187-609 A6 TB23 W SA-1 ERE27A6X!Z 1.04 0.60 127-A6X A6 TB23 GE 12HFA51A42H ERE32801'Z 1.00 0.60 132-801A A8 GND 7.50 3.00 1.39 1.00 GE 121CW51A2A ERE51N81!Z 1.00 0.60 151N-801A A8 GND 7.50 3.00 1.39 1.00 GE 121FC51A2A ERE51NG81Z 1.00 0.60 A8 GND 7.50 3.00 1.39 1.00 GE 801A 121FC51A2A ERE51V81!Z 1.00 0.60 151V-801A A8 GND 7.50 3.00 1.39 1.00 GE 121FCV51AD1A ERE59801!Z 1.00 0.60 159-801A A8 GND 7.50 3.00 1.39 1.00 GE 121AV71B2A ERE2352X!Z 1.20 0.60 C941 RW23 3.30 1.32 1.24 1.20 AGASTAT AND B EGP-D-002 ERE12769!Z 1.04 0.60 127-609 A6 TB23 GE 121AV51D1A Sheet 24 of 36

Entergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Name Median Beta- Component PANEL LOC GERS GERS Am Am MAKE MODEL C Description 4-16 ZPA PEAK ZPA AND 159N-609 ERE1425B!Z 1.14 0.60 420-1846 ERE18681!Z 1.34 0.60 186-801A A8 GND 10.00 4.00 1.85 1.34 GE HEA61 ERE2759X!Z 1.55 0.60 127-509X A5 TB37 7.50 3.00 1.73 1.55 GE 121AV53B ERE40801!Z 0.67 0.60 140-801A A8 GND 5.00 2.00 0.93 0.67 12CEH51A1A ERE46801Z 0.67 0.60 146-801A A8 GND 5.00 2.00 0.93 0.67 12SGC21A1A ERE1865X!Z 0.73 0.60 186-5X C5 RW37 5.00 2.00 1.83 0.73 HFA54E ERE15159Z 0.89 0.60 151V- A5 TB37 509/A,B,C 121JCV52A9A 127-509 ERE12759Z 0.89 0.60 AND 159N- A5 TB37 121AV51D(B)1A/IAV-I 1 509 1 1 51D As stated above, the basis for the GERS values in this table, and the disposition of the relays without GERS, could not be determined in the time available for this review (with two exceptions which are discussed below). Further review could locate GERS or determine that the relays were replaced, in which cases the fragilities could be increased.

For two of the relays, it has been possible to revise the fragility based on new information. For relays 132-509 and 132-609, a GERS for the Westinghouse CRN-1 relay was located [9.14]. This GERS has a 4-16 Hz spectral acceleration of 7g, which yields a median capacity of 1.55g using the factor from Calculation C-015 [9.13]. For relays 159-509 and 159-609, the relays have been replaced. The replacement relay was seismically qualified by test. The test response spectrum had a spectral acceleration of 15g in the 4-16 Hz range, and a ZPA acceleration of 6g. For conservatism, a 4-16 Hz spectral acceleration of 10g was assumed, which resulted in a median capacity of 2.22g. This is higher than the surrogate median capacity. The calculations are in Attachment 10.4.

6.4.4 Review of Capacities of Block Walls A number of the significant components are block wall failures (209.0, 45.3, 210.0, 195.23, 198.1 and 198.2). Block wall fragilities were calculated in Calculation C-017

[9.15]. Three of these walls (209.0, 45.3 and 195.23) had fragilities calculated by scaling the results of the IEB 80-11 [9.16] calculations. The scale factor contained two terms which result in conservatism. The first is the reduction for the peak-to-valley variability in the ground response spectra. For PNPS fragility calculations, this factor is 1/1.35. The USGS and updated EPRI Hazard Curves include this variability; therefore, it should not be included in the fragility calculation. This means that all of the median Sheet 25 of 36

SEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency capacities that were derived from the scaled HCLPFs can be increased by 35%. The second term is the building amplification factor. A multiplying factor of 2.1 was used for all of the walls in C-017 [9.15], yet table of building amplification factors on Page 5 of C-017 gives amplification factors between 2.6 and 12.6. For the block walls in Table 6.2 above, the building amplification factors vary from 4.47 to 9.00, which are 2.12 and 4.29, respectively, times the 2.1 factor used in the fragility calculation. Thus, the median capacities can be multiplied by a factor of at least 2. Multiplying the C-017 fragilities by 2, and also by 1.35, results in median capacities for the three block walls above 2g. For the purpose of this evaluation a median capacity of 2g was used. The calculations are in Attachment 10.4.

Block walls 210.0, 198.1 and 198.2 had full fragility analysis. No excess conservatism in these analyses was identified. Therefore, the fragility values for these block walls were not changed.

6.4.5 Review of Capacities of Other Components Many components in the model had median capacities based on factoring the anchorage calculations for Unresolved Safety Issue (USI) A-46 [9.17]. The calculation process is described in Section 3.1.4.2 of the PNPS IPEEE submittal [9.1]. The capacity determined in the reference calculation was assumed to be calculated following the Conservative Deterministic Failure Margin (CDFM) HCLPF methodology in EPRI NP-6041 [9.2]. This is a conservative assumption, but the individual reference calculations have not been located at this time and the degree of conservatism has not been assessed. This capacity was converted to a median HCLPF by dividing by a factor of 1.35 for peak-to-valley variability, and the median capacity was calculated using a generic composite variability (pc) of 0.46. As noted above, this factor should not be included when using the USGS or updated EPRI Hazard Curves. The median capacities for these components can be in increased by 1.35. Those fragilities in Table 6.2 above, other than those for relays and block walls, that had 13c = 0.46 were assumed have a median capacity based on factoring the A-46 capacity. These median capacities were increased by 1.35. The calculations are in Attachment 10.4.

6.4.6 Revised Fragilities The revised fragilities are shown in Table 6.4 below. The basis for the change is noted in the "Comments" column. For a component noted as "Not needed", the median was Sheet 26 of 36

' Entergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency changed to 2g to effectively remove it from the risk calculation. For a component noted as "Brs", the revised median is 1.35 times the original median, reflecting removal of the reduction for peak-to-valley variability.

Table 6.4 Revised Fragilities Revised Fragilitv Oriqinal Fraqilitv Number Name Median Beta-C Comments Median Beta-C Component Description LOSS OF 5 ELOSPXXXXZ 0.35 0.55 OFFSITE POWER Not QUAD ROOM 28 EFN204ABXZ 2.00 0.46 0.61 0.46 COOLER FANs 204A/B FAILURE Not QUAD ROOM 29 EFN204CDXZ 2.00 0.46 not 0.61 0.46 COOLER FANs 204C/D FAILURE SEISMICALLY INDUCEDR 3 ERE18781!Z 0.25 0.60 0.25 0.60 CHATTE CHATTER OF RELAY 187-801A SEISMICALLY CORRELATED 6 ERE132X9!Z 1.50 0.60 Found 0.55 0.60 GERS CHATTER OF 132-509 AND 609 SEISMICALLY Replaced CORRELATED 7 ERE159X9!Z 2.22 0.60 with 0.55 0.60 RELAY qualified CHATTER OF ABB 59N 159-509 AND 609 (1 AND 2)

Limited to BLOCK WALL 36 EBW209/OXZ 2.00 0.46 2.00 0.82 0.46 2.00 209.0 FAILS DIESEL 35 EBDDGBLDXZ 1.04 0.46 Brs 0.77 0.46 GENERATOR BUILDING FAILS Limited to BLOCK WALL 45 EBW 45/3XXZ 2.00 0.46 2.00 1.07 0.46 45.3 F A LS 2.00 45.3 FAILS 33 EBSA8XXXXZ Full fragility 0.96 0.47 A8 BUS analysis FAI LURE SEISMICALLY INDUCED 37 EBSB2XXXXZ 1.13 0.46 Brs 0.84 0.46 ILUREO FAILURE OF BUS B2 Sheet 27 of 36

ýt-Entergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Revised Fragility Original Fragility Number Name Median Beta-C Comments Median Beta-C Component Description BODG FUEL OIL 43 EPM184AXXZ 1.42 0.46 Brs 1.05 0.46 PUMP P184 FAI LURE SEISMICALLY CORRELATED 13 ERE16059Z 0.89 0.60 RELAY CHATTER OF 160-509 SEISMICALLY INDUCED CHATTE R 14 ERE18159!Z 0.89 0.60 CHATTER OF RELAY 181-509 SEISMICALLY 15 ERE18759Z 0.89 0.60 INDUCED CHATTER OF RELAY 187-509 SEISMICALLY INDUCED 16 ERE27A5X!Z 0.89 0.60 CHATTE R CHATTER OF RELAY 127-A5X SEISMICALY INDUCED DIESEL 32 EDLGEABXXZ 1.39 0.65 GENERATOR A/B CORELATED FAILURE VAC207A-D FAILS RBCCW 42 EFN207A-DZ 1.36 0.46 Brs 1.01 0.46 PRESSR E PRESSURE BOUNDARY SEISMICALLY INDUCED R 23 ERE15169!Z 1.04 0.60 CHATTE CHATTER OF 151V-609/A,B,C SEISMICALLY CORRELATED 24 ERE16069Z 1.04 0.60 RELAY CHATTER OF 160-609 SEISMICALLY INDUCED 25 ERE18169!Z 1.04 0.60 CHATTE R CHATTER OF RELAY 181-609 SEISMICALLY INDUCED 26 ERE18769Z 1.04 0.60 CHATTER OF RELAY 187-609 Sheet 28 of 36

A SEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Revised Fragility Original Fragility Number Name Median Beta-C Comments Median Beta-C Component Description SEISMICALLY INDUCED CHATTE R 27 ERE27A6X!Z 1.04 0.60 CHATTER OF RELAY 127-A6X FAILURE OF VAC205 OR 206 44 EFNDWCOOLZ 1.43 0.46 Brs 1.06 0.46 FAMILY OF FAN FAMILY OF FAN COOLERS SEISMICALLY INDUCED CHAUCE R 17 ERE32801!Z 1.00 0.60 CHATTER OF RELAY 132-801A SEISMICALLY INDUCED 18 ERE51 N81!Z 1.00 0.60 CHATTER OF RELAY 151N-801A SEISMICALLY INDUCED 19 ERE51NG8!Z 1.00 0.60 CHATTER OF RELAY 151NG-801A SEISMICALLY INDUCED 20 ERE51V81!Z 1.00 0.60 CHATTER OF RELAY 151V-801A SEISMICALLY INDUCED CHATTE R 21 ERE59801!Z 1.00 0.60 CHATTER OF RELAY 159-801A SEISMICALLY CORRELATED 31 ERE2352X!Z 1.20 0.60 RELAY CHATTER OF 23A-K52A AND B HPCI ROOM Not COOLING FANs 46 EFN201ABXZ 2.00 0.46 1.23 0.46 COIA needed VAC201A/B FAILURE VAC202A&B Not FAIL RBCCW 47 EFN202ABXZ 2.00 0.46 Ned 1.23 0.46 RES UR needed PRESSURE I I BOUNDARY Sheet 29 of 36

SEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Revised Fragility Original Fragility Number Name Median Beta-C Comments Median Beta-C Component Description CRD QUAD Not ROOM 48 EFN203ABXZ 2.00 0.46 1.23 0.46 COOLING FANS VAC 203A/B FAILURE DIESEL STARTING AIR 49 ECMK103ABZ 1.73 0.46 Brs 1.28 0.46 COMPRESSORS K103A/B CORRELATED FAILURE DIESEL FUEL 50 EPM141ABXZ 1.73 0.46 Brs 1.28 0.46 OIL PUMPS P-141A/B FAILURE DG A & B SEIS CORREL FUEL 51 EVPEABXXXZ 1.73 0.46 Brs 1.28 0.46 OIL PRESSURE REG VALVE E FAILURE DG A & B SEISMICALLY 52 EVRCABXXXZ 1.73 0.46 Brs 1.28 0.46 CORRELATED FUEL OIL RELIEF VALVE C FAIL DIESEL AIR PSV4565C AND 53 EVS4565CDZ 1.73 0.46 Brs 1.28 0.46 D SEISMIC CORRELATION FAILURE SEISMICALLY CORRELATED 22 ERE12769Z 1.04 0.60 CHATTER OF RELAY 127-609 AND 159N-609 SEISMICALLY INDUCED 30 ERE1425B!Z 1.14 0.60 CHATTE R CHATTER OF 420-1846 SEISMICALLY 0.60 INDUCED CHATTE R 34 ERE18681Z 1.34 CHATTER OF RELAY 186-801A SEISMICALLY INDUCED R ERE2759X!Z 1.55 0.60 CHATTE 38 CHATTER OF 127-509X Sheet 30 of 36

SEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Revised Fragility Original Fragility Number Name Median Beta-C Comments Median Beta-C Component Description 39 ETKT105ABZ 1.27 0.46 Brs 0.94 0.46 CSTs T105AIB FAILURE 40 EBW210/0XZ Full fragility faIty 1.65 0.57 BLOCK WALL 21.FAL analysis 210.0 FAILS 41 EBW195/23Z 2.00 0.46 Limited to 1.00 0.46 BLOCKWALL 2.00 195.23 FAILS CST 105 A/B Interaction FAILS N2 TANKDUE TO 4 ETK105ABNZ 2.00 0.46 fixe 0.16 0.46 fixed N2 TANK INTERACTION SEISMICALLY 0.60 INDUCED 8 ERE40801!Z 0.67 CHATTER OF RELAY 140-801A SEISMICALLY INDUCED 9 ERE46801Z 0.67 0.60 CHATTER CHATTER OF RELAY 146-801A SEISMICALLY 10 ERE1865X!Z 0.73 0.60 INDUCED CHATTER OF RELAY 186-5X SEISMICALLY INDUCED R 12 ERE15159IZ 0.89 0.60 CHATTE CHATTER OF 151V-509/A,B,C SEISMICALLY INDUCED CORE 1 EISLOCACSZ 0.00 0.46 SPRAY PIPE RUPTURE SEISMICALLY 0.46 INDUCED RHR 2 EISLOCRHRZ 0.00 PIPING RUPTURE SEISMICALLY CORRELATED 11 ERE12759!Z 0.89 0.60 CHATTER OF RELAY 127-509 AND 159N-509 54 EBWAHOQIXY Full fragility 3 0.79 BLOCK WALL analysis 198.1 FAILS EBW1 98/2XZ Full fragility 3.43 0.79 BLOCK WALL analysis 198.2 FAILS Sheet 31 of 36

SEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency 6.5 Re-Assessment of SCDF The PNPS SCDF was calculated in the PNPS IPEEE SPRA using the systems model as input to the SHIP model. The model incorporated seismic fragilities for components into event trees and fault trees, producing sequences representing combinations of system failures that could lead to core damage following the seismic event. For this evaluation, the effect on plant SCDF of changing the fragility of a given component (structure, system or equipment) can be determined by changing the fragility parameters in the model and re-running it using the SHIP software. However, all of the fragilities in the SHIP model are expressed in terms of PGA. In order to calculate the SCDF using hazard curves for 10 Hz, 5 Hz and 1 Hz it is necessary to change the fragilities to reference the spectral acceleration at that frequency rather than the PGA. It is not possible, at this time, to change all of the fragilities in the model. Therefore, the change in plant SCDF was estimated using the process described below, which is the same as the NRC used.

The NRC developed a plant-fragility from the median capacity and HCLPF reported in the PNPS IPEEE submittal. These numbers came from the SHIP risk quantification.

However, the median capacity and composite variability in the NRC GI-199 SRA are slightly different than those that would be calculated using the SHIP numbers. The NRC notes that in some cases the fragility values were modified so as to match the reported SCDF. If the plant-level fragility reported by the NRC is used with EPRI 1989 PGA Hazard Curve, the SCDF is computed as 5.8E-05 per year. This is what SHIP computes. Ifthe median capacity and composite variability computed directly from the SHIP output (median capacity and HCLPF) are used, the computed SCDF is higher.

Therefore, it is reasonable to adjust the fragility to get agreement with the SHIP quantification for the same hazard curve.

The SHIP model was re-run with the USGS PGA hazard and using revised fragilities as per Table 6.4, which results in a revised SCDF of 2.14E-5 per year. The median capacity and HCLPF were 0.57g and 0.33g, respectively. The composite variability calculated from the median capacity and HCLPF is 0.23. Convolving the USGS PGA Hazard Curve with this fragility (C5 o = 0.57g, P3c = 0.23), the SCDF is 2.78E-05 per year.

This is higher than the SHIP result of 2.14E-05 per year. Adjusting the fragility to C50 =

0.63g and P3c = 0.23 and convolving with the USGS PGA hazard, the SCDF is 2.14E-05 per year. This agrees with the SHIP result.

Using this fragility and convolving with 10 Hz, 5 Hz and 1 Hz gives the results shown below in Table 6.5 compared to the original NRC results. The convolution calculations are summarized in Attachment 10.3. The detailed calculations are contained in Attachment 10.5.

Sheet 32 of 36

SEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Table 6.5 2008 USGS Hazard SCDF with Revised Fragilities PGA 10 Hz 5 Hz 1 Hz Max NRC Fragility 4.26E-05 6.88E-05 6.19E-05 2.40E-05 6.88E-05 Revised Fragility 2.78E05 4.88E-05 4.36E-05 1.79E-05 4.88E-05 Revised Fragility 2.14E05 3.98E-05 3.53E-05 1.49E-05 3.98E-05 SHIP Adjusted I Note that the SCDFs in the first row of Table 6.5 were calculated by Entergy using the NRC plant-level fragility and the 2008 USGS seismic hazard curves. For comparison the NRC GI-199 SRA reported SCDFs of 4.3E-05, 6.9E-05, 6.2E-05, 2.4E-05, and 6.9E-05 for PGA, 10 Hz, 5 Hz, 1 Hz and Maximum, respectively.

The same process was also done with the updated EPRI Seismic Hazard Curves [9.12]

and the same fragilities considered in conjunction with the USGS Hazard Curves. The EPRI Hazard Curves were prepared using different ground motion experts and use a Cumulative Absolute Velocity (CAV) filter to remove high frequency waves with limited energy. The results are shown in Table 6.6 below.

Table 6.6 2010 EPRI Hazard SCDF with Revised Fragilities PGA 10 Hz 1 Hz Max NRC Fragility 3.11E-05 2.74E-05 1.87E-05 3.11E-05 Revised Fragility 2.54E05 2.20E-05 1.39E-05 2.54E-05 Revised Fragility 1.46E05 1.22E-05 5.57E-07 1.46E05 SHIP Adjusted Sheet 33 of 36

A Entergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency

7.0 CONCLUSION

S It is concluded that the PNPS plant is more robust than shown in the PNPS IPEEE study and the NRC GI-199 SRA. The site median capacity and composite uncertainty used by the NRC resulted in a conservative estimate of SCDF of 6.9E-05 per year.

The improved values for the median capacity and composite uncertainty calculated by the review team resulted in a SCDF estimate of 3.98E-05 per year associated with the current USGS Hazard Curves, which represents a significant reduction from the GI-199 reported SCDF estimate and is a more realistic estimate of the seismic risk.

It should also be noted that using the improved fragility along with the 2010 EPRI updated Seismic Hazard Curves instead of the USGS curves further reduces the SCDF value to 1.46E-05 per year.

8.0 RECOMMENDATIONS 8.1 Short Term Recommendations:

- Consider developing more formal calculations per EN-DC-126 to enhance the supporting documentation associated with this Engineering Report.

- Verify the assumption used in the relay fragility calculation C-015 [9.13] that relays without GERS were verified by PNPS to meet A-46 requirements.

8.2 Long Term Recommendations:

- Consider modeling reactor pressure vessel (RPV) depressurization function for seismic sequences that involve loss of high pressure RPV injection and potential use of low pressure RPV injection (from RHR/Low Pressure Coolant Injection (LPCI) and Core Spray systems) in a future SPRA.

- Consider modeling the direct torus vent system for seismic sequences that involve loss of containment decay heat removal (loss of suppression pool cooling and drywell sprays) in a future SPRA.

- Continue locating GERS or test data for relays in C-015 [9.13] to enable increasing the median capacity of the fragilities. Investigate the operational requirements of the relays.

Sheet 34 of 36

A

!Entergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency

9.0 REFERENCES

9.1 Pilgrim Individual Plant Examination of External Events Report, July 1994.

9.2 EPRI, "Methodology for Assessment of Nuclear Power Plant Seismic Margin (Revision 1)," NP-6041-SL, August 1991 9.3 NRC, "Safety/Risk Assessment Results for Generic Issue (GI) 199, Implications of Updated Probabilistic Hazard Estimates in Central and Eastern United States on Existing Plants," dated September 2, 2010 (ADAMS Accession Number ML100270582) 9.4 NRC Information Notice 2011-05: Tohoku-Taiheiyou-Oki Earthquake Effects on Japanese Nuclear Power Plants 9.5 NEA-02-044, February 13, 2002, "The Temperature Profile of the HVAC Systems for the Pilgrim IPE and Update for the Life Extension Project 9.6 NRC Frequently Asked Questions related to the March 11, 2011 Japanese Earthquake and Tsunami 9.7 Email from Martin Stutzke (USNRC) to John Bretti (Entergy), "Pilgrim Seismic Hazard Curves used in GI-199", dated April 7, 2011 (see Attachment 10.6).

9.8 NRC Regulatory Guide 1.208, "A Performance Based Approach to Define the Site Specific Earthquake Ground Motion", March 2007.

9.9 EPRI TR-103959, "Methodology for Developing Seismic Fragilities", 1994.

9.10 USNRC, "Procedural & Submittal Guidance for the Individual Plant Examination of External Events (IPEEE) for Severe Accident Vulnerabilities", NUREG-1407, June 1991.

9.11 USNRC, "Seismic Hazard Characteristics of 69 Nuclear Power Plant Sites East of the Rocky Mountains," NUREG/CR-5250, Vols. 1-8, January 1989.

9.12 EPRI, "Updated Seismic Hazard Results for the Arkansas, Fitzpatrick, Grand Gulf, Indian Point, Pilgrim, River Bend, Vermont Yankee, and Waterford Nuclear Sites." August 2010 (Not published, Proprietary).

9.13 Stevenson & Associates, C-015: Relay Fragility Analysis for Seismic PRA (BECo SUDDS/RF 94-10).

9.14 EPRI, "Seismic Ruggedness of Relays," NP-7147-SL, V2, Addendum 2, April 1995.

9.15 Stevenson & Associates, C-017: Estimated Fragilities for Blockwalls for Pilgrim Station Seismic PRA (BECo SUDDS/RF 94-10).

9.16 NRC, "Masonry Wall Design," IE Bulletin 80-11, May 1980.

Sheet 35 of 36

SEntergy ENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency 9.17 NRC, "Verification of Seismic Adequacy of Mechanical and Electrical Equipment in Operating Reactors, Unresolved Safety Issue (USI) A-46," Generic Letter 87-03, February 1987.

9.18 Engineering Report PNPS-NE-07-0006, "Pilgrim Probabilistic Safety Assessment (PSA)," Rev.2, April 2008.

10.0 ATTACHMENTS 10.1 Selection Criteria for 27 Plants that Require Further Investigation (3 pages) 10.2 Develop Methodology that Emulates NRC's Use of IPEEE Parameters to Calculate Seismic Core Damage Frequency (SCDF) Values (19 pages) 10.3 Revised SCDF for PNPS Using USGS & EPRI Hazard Curves (2 pages) 10.4 Revised Calculations for Identified Low Capacity Components (14 pages) 10.5 SCDF Calculations Using Plant Level Fragility (23 pages) 10.6 Email from Martin Stutzke (USNRC) to John Bretti (Entergy) (7 pages) 10.7 SHIP Model Input and Output (102 pages) 11.0 REVIEW TEAM MEMBERS Joe Abisamra, PE - Chief Engineer (ECH) - Team Lead Clem Yeh - Engineering Supervisor (WPO)

Dragos (Dan) Nuta, PE - Senior Engineer (IPEC)

Clem Littleton - Senior Lead Engineer (PNPS)

John Bretti - Senior Lead Engineer (WPO)

John Favara - Senior Lead Engineer (WPO)

Ray Pace - Engineering Supervisor (PNPS)

Paul Baughman, PE - Senior Consultant (ARES Corporation)

Fred Mogolesko -Consultant (ICE Corporation)

Sheet 36 of 36

!%--Entergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Attachment 1 Selection Criteria for 27 Plants that Require Further Investigation

11ýEntergy ENG REPORT PN PS-RPT-I 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency NRC's August 2010 List This is NRC's explanation of how they compiled the list that was shared at the NRUG meeting at Amelia Island in early August and again during the presentation to the ACRS in Nov 2010.

Please note that NRC says they were not trying to identify specific plants but, instead, were trying to determine if further evaluation by the Generic Issue Program was warranted. Because there are plants in the "continue" region (with a change in seismic CDF greater than 10E-5),

their conclusion is that they should continue to evaluate the Generic Issue.

Two sets of seismic hazard curves were developed to support the Individual Plant Examination of External Events (IPEEE) that was requested by Generic Letter 88-20, Supplement 4:

1. Lawrence Livermore National Laboratory (LLNL), as reported in NUREG-1488
2. Electric Power Research Institute Seismic Owners Group (EPRIISOG), as reported in EPRI NP-6395.

Note that there are LLNL seismic hazard curves all for Central and Eastern United States (CEUS) plants, but that some plants did not participate in the EPRIJSOG. The observation that there are two sets of credible, IPEEE-era seismic hazard curves implies that there are two ways to compute the change in seismic core-damage frequency (delta-SCDF). Specifically, you can compute the change with respect to the LLNL curves and/or with respect to the EPRI/SOG curves.

For plants that had both sets of curves, we computed both delta-SCDFs and developed the so-called "delta-delta plot" (Figure 1) to decide which plants warranted further investigation. If one of the delta-SCDFs was greater than or equal to 1E-5/y and the other was positive, then we binned the plant into the "continue" region. This process identified 24 plants as listed below:

1. Crystal River3
2. Dresden 2
3. Dresden 3
4. Farley 1
5. Farley 2
6. Indian Point 2
7. Indian Point 3 8- Limerick 1
9. Limerick 2
10. North Anna 1

'11. North Anna 2

12. Oconee 1
13. Oconee 2
14. Oconee 3
15. Peach Bottom 2
16. Peach Bottom 3
17. Perry 1
18. River Bend I Page 1 of3

ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency

19. Seabrook 1
20. Sequoyah 1
21. Sequoyah 2
22. Summer 23 Watts Bar 1
24. Wolf Creek 1 For plants that did not participate in the EPRI/SOG, we were limited to considering only the delta-SCDF with respect to the LLNL seismic hazard curves. If this delta-SCDF was greater than or equal to 1 E-5/y, then we binned the plant into the "continue" zone. This process identified 3 plants as listed below:
1. Duane Arnold
2. Saint Lucie 1
3. Saint Lucie 2 Hence, there are a total of 27 plants (24 + 3) that fali into the "continue" zone.

Reference:

NRC staff presentation to ACRS Siting Subcommittee, November 30, 2010.

Page 2 of 3

PNPS-RPT-11-00001

  • Entergy ENG REPORT Re-assessment of Pilgrim Seismic Core Damage Frequency Figure 1 4 .E-05 3.1-06 2.E-05 S1.15-05 II

-2.15-05

-3.E-05 05S

-5.1-OM

-iE-OS O-E-OO 1.Ei- 21-05 FE-05 4.E-05 5.E-45 6E-OS 7.1-OS Change in SCDF (fE SM Baseline)

Page 3 of 3

ENG REPORT PNPS-RPT-1 1-00001 z-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency Attachment 2 Develop Methodology that Emulates NRC's Use of IPEEE Parameters to Calculate Seismic Core Damage Frequency (SCDF) Values

A EENG REPORT PNPS-RPT-1 1-00001

!L'-Enterg Re-assessment of Pilgrim Seismic Core Damage Frequency Develop Methodology that Emulates NRC's use of IPEEE Parameters to Calculate Seismic Core Damage Frequency (SCDF) Values Prepared by: Dragos Nuta, PE Reviewed by: Paul Baughman EXECUTIVE

SUMMARY

  • Full understanding of methodology used by NRC to calculate SCDF values was achieved.
  • The NRC Report results were duplicated, validating our understanding.
  • The methodology is used to develop more realistic estimates of risk In developing the SCDF estimates, the NRC report (Ref.1) indicates that the Pilgrim Nuclear Power Station (PNPS) Seismic PRA (SPRA) was used to establish plant-level firagility curves parameters.

These parameters were then convolved with the hazard curves derived by United States Geological Survey (USGS) for the PNPS coordinates, and resulted in the estimates of the SCDFs based on the peak ground acceleration (PGA), 10 Hz, 5 Hz, and 1 Hz hazard curves.

It was decided that the most effective way for developing more realistic seismic hazard estimates is to fully understand the basis for the NRC developed parameters and methodology used, after which the NRC SCDF calculation methodology would be used to reflect the revised fragilities and calculate more realistic SCDF estimates. In order to clearly understand the various parameters used by NRC in their work, our understanding of the NRC methodology had to be verified by duplicating the results obtained by the NRC.

Activities undertaken to achieve verification of the NRC SCDF estimates included:

I. Document input information referred to in the NRC report (Ref. 1)

2. Extract all information from the NRC report describing how various parameters were established.
3. Document the methodology used to calculate the SCDF estimates.
4. Obtain USGS Hazard Curves (which were used in the NRC Report)
5. Derive parameters and develop mathematical formulation for all terms used in the SCDF calculations.
6. Use the methodology and derived parameters and perform risk analyses that duplicate the NRC Report SCDFs for PNPS.

Page 1 of 19

PNPS-RPT-11-O0001 z-EnteWg ENG REPORT Re-assessment of Pilgrim Seismic Core Damage Frequency A discussion of the work performed in support of all activities described above and the results obtained is provided below.

1. Document input information referred to in the NRC report (Ref. 1)

Page C-5 of the NRC Report (Ref. 1) states that the C50 and Pc parameters were obtained from the SPRA probability plot of the reported plant-level fragility data.

Table C.1. Bases for Establishing Plant-Level Fragility Curves Parameters From IPEEE Information.

Basis Source Parameters la SPRA C5o and Pc determined by probability plot of the reported plant-level fragility curve Applicability of the la basis is provided in Table C-2 from which an excerpt is provided below.

Indeed, the PNPS IEEE Report (Ref 2) developed a plant level fragility that reflects not only the seismic robustness of the PNPS Structures, Systems, and Components (SSCs), but also the effects of random and other non-seismic related failures. The Mean Capacity at the plant level (in terms of PGA) was given as 0.48g (Figure 3-17 of Ref. 2).

The NRC work used a 0.49g median capacity, together with a composite lognormal standard deviation Pc, representing randomness and uncertainty, of 0.27 in their risk assessment work.

The parameters are introduced in Table C-2 (Page C-7) of the NRC report, as extracted below:

Table C-2. Plant-Level Fragility Data.

Docket PGA Fragility Spectral Ratios Numbe HCL C5 13c 10 5 1 Bas Plant r IPEEE Method PF Hz Hz Hz Is Pilgrm 1 050002 seismic PRA 0.4 0.2 .516 0.5J7l 93 9 7 1.5 16 I It should be noted that the C50 and Pc parameters, as well as the Spectral Ratios, will be discussed below.

2. Extract all information from the NRC report describing how various parameters were established.

In using plant level fragilities based on the IPEEE Review Level Earthquake (RLE), taken by NRC to be the 1989 EPRI hazard data and ground response spectra, adjustments to the fragilities had to be made so that they may be used in conjunction with the hazard curves, and ground spectra, based on 2008 USGS data.

The NRC captures the adjustments in Figure C-I (Page C-4) of the NRC Report (Ref 1) as follows:

Page 2 of 19

ENG REPORT PNPS-RPT-1 1-00001 OEnteigy Re-assessment of Pilgrim Seismic Core Damage Frequency Ina a1C6 PKI shape noed InSPRA or m10HCLPF C50 HCLPF mCLF ,,.; HCLPF '- P~(Ialur) = 0.01 I I I i I n I1Hz 5Hz 10 Hz P98 Definition FigureTheC-I. of Spectral Fragility in Terms of the PGA-Based Fragility and Figure C-1. The Definition of Spectral Fragility In Terms of the PGA-Based Fragility and the Review-Level Response Spectrum.

The median seismic capacity C 50 is calculated as follows:

The High Confidence of a Low Probability of Failure (HCLPF) reported in Table 3-13 of Ref. 2 is 0.25g:

Table 3-13 SPRA Results (EPRI)

Result Value Value JI Seismic Core Damage Frequency 5.82 E-05 3.13 E-05 Plant Median Capacity (PGA(g)) 0,48 0-57g Plant High Confidence of a Low Probability of 0.25g 0_32g Failure (HCLPF) (PGA(g))

Plant HCLPF based on seismic faults only - random failures and human reliability excluded The HCLPF is related to the median seismic capacity C50 to be used in the work reflecting the USGS hazard curves as follows:

C 50 = HCLPF e (2.3264 x Pc)

NRC assumed a Pc = 0.27 which results in C 50 =0.25g x e (2.3264 x0 27 =) 0.25g x 1.874 = 0.48g. This median capacity matches the median capacity reported in Table 3-13 of Ref. 2, as shown above.

However, NRC adjusted slightly the fragilities so that the calculated SCDF matched the results obtained when using the 1989 EPRI PGA hazard curve, and a C 50 = 0.49g was used in the assessments. [Note that when the deconvolution is done with the 1989 EPRI PGA hazard curve and the NRC fragility, the resulting SCDF is 5.76E-05. The value reported by the NRC in Table D.2 of the GI-199 SRA is 6.8E-06. The reason for this discrepancy is not known.]

Page 3 of 19

ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency The in,, M5 , and mto spectral ratios were obtained from the EPRI based RLE as the ratio between the spectral amplitudes at I Hz, 5 Hz, and 10 Hz, and the peak ground acceleration for the spectrum.

The calculated spectral ratios are provided in Table C-2 from which excerpts were provided above.

The PNPS spectral ratios for 1 Hz, 5 Hz, and 10 Hz are given as 0.5, 1.66, and 1.55, respectively, as shown in the Table C2 excerpt above.

3. Document the methodology used to calculate the SCDF estimates.

Appendix A of the NRC Report (Ref.1) contains an extensive explanation as to how the SCDF is calculated using the Hazard Curve for a certain frequency and the fragilities for a certain SSC or, in our case, the plant level fragility (consisting of the median capacity and composite uncertainty). The mathematical formulation shown below in the excerpt from Appendix A of Ref. 1:

ai FdPcj)a)

SCDF(a 1 ,ai-.)= j Hi(a)I da daHi(a)PCo(a) I (A-12) is solved numerically.

To allow an understanding of exactly what was done as part of this task that validated our understanding of the NRC parameters used and methodology by duplicating the SCDF estimates published by NRC for PNPS, we present a plain language description of the steps involved in estimating a SCDF.

The steps involved in obtaining a seismic core damage frequency estimate are as follows:

a) Obtain the hazard curves for various frequencies of interest, including the PGA.

b) Tabulated values of accelerations and their annual exceedance frequency are usually provided so data needs not be read off of the Hazard Curve. The data is arranged in order of increasing accelerations.

c) Between each ascending pair of accelerations (interval), establish the interval acceleration and interval frequency as described below.

d) Calculate the interval z-value for a normal distribution, given the interval acceleration, the median capacity of the item for which the SCDF is calculated, and the composite 13c, which represents the randomness and uncertainty in the median capacity, as described below.

e) Calculate the conditional probability of failure f) Convolve the interval frequency with the conditional probability of failure and obtain the probability of failure for each interval.

g) The summation of the probabilities of failure for all acceleration intervals represents the total probability of failure or the SCDF for the item having a median capacity Am and the associated P3c when the hazard curve for the selected frequency is considered.

Page 4 of 19

ENG REPORT PNPS-RPT-I 1-00001

  • Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency The steps discussed above under b) through g) were incorporated into an EXCEL spreadsheet as shown below:

A B C D E F G H Hazard Curve Freq. Interval Interval Interval Z Conditional Probability Probability Acceleration Acceleration (a) Frequency ln(a/Am)/P3c of Failure of Failure (A._ + A i ÷1_/2_ (B- B j+) NORMDIST Z = (Fi) E i x G, where "i" is the row number under consideration A discussion of the various steps, with headings captured under Columns A through H in the EXCEL spreadsheet, is presented below.

a) Obtain the hazard curves for various frequencies of interest, including the PGA.

Hazard Curves are developed by ground motion experts. After establishing all seismic zones of known seismic activity that could affect a particular location, each seismic zone is associated with a magnitude M that may occur at the specific seismic zone, including its recurrence interval, the distance from the seismic zone to the site where the Hazard Curves must be established, as well as other parameters that deal with variability and wave propagation.

From each seismic zone, wave propagation formulations are used to propagate seismic waves of various frequencies to the site where the Hazard Curves are established. The frequencies considered include, as a minimum, 1 Hz, 5 Hz, 10 Hz, and PGA.

As mentioned above, Hazard Curves are calculated for various frequencies. An excerpt from the NRC report (Ref 1) shows PGA and 1 Hz Hazard Curve plots:

I OI Ht 0.01 '1 1 10 The X-axis contains acceleration levels, while the Y-axis contains annual exceedance probabilities, or annual exceedance frequencies. A point on a Hazard Curve is associated with an acceleration and an annual exceedance probability.

Page 5 of 19

Ar ENG REPORT PNPS-RPT-1 1-00001

!z-Enterg Re-assessment of Pilgrim Seismic Core Damage Frequency While the pairs of acceleration and exceedance probability may be read off of the Hazard Curves, a tabulation of accelerations and their annual exceedance probabilities is usually provided and contains a minimum of 10-12 pairs of values. Given the summation process used to emulate an integral, the more points considered, the more accurate the representation of the Hazard Curve in calculating the SCDF.

c) For every interval, establish the interval acceleration and frequency.

Given a tabulation that has acceleration values increasing in magnitude, and corresponding annual exceedance frequencies that decrease in magnitude, the interval from one acceleration value to the one immediately below, has an interval acceleration and frequency established as follows:

  • The interval acceleration is the average of the top acceleration and the one immediately below. In the tabulation excerpted above, having columns A through H, the interval acceleration for the ith row is (Ai + A i+,) / 2. The result is placed in Column D of the excerpt.

" The interval frequency is calculated as the difference between the annual exceedance frequencies for two accelerations. In the tabulation above, the frequency for the ith row is the difference between the exceedance probabilities shown on row "i" and row "i + 1". This value is entered in Column E of the excerpted tabulation.

d) Calculate the z-value for the acceleration interval The z-value is associated with a normal distribution that has the mean value of zero and an area under the distribution curve of 1.0. It is calculated as Z = (In (a/Am)) / P, where

" a = acceleration value for the interval. It is captured under Column D of the excerpted EXCEL spreadsheet above.

  • Am is the median capacity of the SSC considered or, in our case, the point estimate fragility developed for the plant. When the plant Am value established using the 1989 EPRI Hazard Curves is used in conjunction with Hazard Curves developed by USGS, the median capacity for the plant is introduced as C 50 when the PGA Hazard curve is considered, and mi C 50 when the frequency "i" Hazard Curve is considered. Both C50 and the "m" factors were discussed under 2.

above.

  • P3c is the composite uncertainty.

Page 6 of 19

S-Entergy ENG REPORT PNPS-RPT-I1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency For normal distributions, the z-value represents the number of standard deviations away from the mean (which is the center of the symmetrical distribution curve).

e) Calculate the conditional probability of failure.

The conditional probability of failure for a normal distribution is the area from the left tail of the distribution to the calculated z-value. For these calculations, the conditionalprobability of failure was calculated using the NORMDIST Z function in EXCEL and the z-value calculated as discussed above (and present in Column F of the tabulated excerpt).

The conditional probability of failure may be calculated by hand using tabulations of Z values and probabilities (area under the curve), remembering that the given area is always given from the mean to the absolute value of"z". Thus, probability for a negative z-value (z-value is to the left of the mean) will be obtained by reading the area (probability) from the normal distribution table, and subtracting from 0.5 (which is the area for each half of the normal distribution plot) to obtain the area from the left tail of the distribution to the negative z-value. The probability for a positive z-value (z-value is to the right of the mean) will be obtained by reading the area (probability) from the normal distribution table, and adding it to 0.5 (which is the area for each half of the normal distribution plot) to obtain the area from the left tail of the distribution to the positive z-value.

d) Multiply the interval (annual exceedance) frequency and the conditional probability of failure to obtain the probability of failure for each interval.

Values captured under Columns E and G of the excerpted tabulation, respectively, for each acceleration interval are multiplied and the results are entered under Column H of the excerpted tabulation.

e) Calculate the total probability of failure (SCDF)

The total probability of failure for an SSC having a median capacity Am and 0c composite uncertainty, when considering a Hazard Curve representing a specific frequency, is obtained by adding the probabilities of failure for all acceleration intervals used to discretize the Hazard Curve.

The values of probability of failure in Column H were summed to provide the Total Probability of Failure. When the PNPS point estimate fragilities are used, as discussed under d) above, the summation represents the SCDF.

As discussed below, the NRC Report (Ref. 1) provides SCDF using the 1 Hz, 5 Hz, 10 Hz, and PGA USGS Hazard Curves. The NRC reported SCDF results were duplicated using the methodology described above, as described under 6, below.

4. Obtain USGS Hazard Curves (which were used in the NRC Report)

While hazard curves for various wave frequencies could have been obtained from USGS developed module 2008. CEUS.Opl0.2000.txt.gz by selecting the coordinates for the PNPS, the data was obtained from the NRC (Refer to Attachment 10.6 of Report PNPS-RPT-l 1-0001).

Page 7 of 19

"Entergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency USGS Hazard Curves used for the work discussed herein were obtained from the NRC and are as follows (Note Hazard Curves are based on 2008 USGS adjusted for site soil conditions using EPRI/SOG site amplification functions (EPRI NP-6395-D):

PGA 10 Hz 5 Hz 1 Hz Annual Annual Annual Annual exceedence exceedence exceedence exceedence Acceleration frequency Acceleration frequency Acceleration frequency Acceleration frequency (g's) (per year) (g's) (per year) W's) (per year) (g's) (per year) 0.0148 6.76E-03 0.0178 1.04E-02 0.0215 1.31E-02 0.0040 1.16E-02 0.0207 4.63E-03 0.0266 7.07E-03 0.0320 8.44E-03 0.0060 7.39E-03 0.0288 3.12E-03 0.0392 4.70E-03 0.0473 5.30E-03 0.0092 4.48E-03 0.0401 2.06E-03 0.0584 3.03E-03 0.0698 3.21E-03 0.0140 2.57E-03 0.0560 1.34E-03 0.0870 1.88E-03 0.1037 1.88E-03 0.0211 1.40E-03 0.0771 8.68E-04 0.1294 1.14E-03 0.1539 1.07E-03 0.0328 7.24E-04 0.1065 5.55E-04 0.1922 6.69E-04 0.2272 5.92E-04 0.0495 3.58E-04 0.1446 3.52E-04 0.2790 3.83E-04 0.3213 3.20E-04 0.0763 1.71E-04 0.1957 2.23E-04 0.3955 2.15E-04 0.4608 1.69E-04 0.1163 8.09E-05 0.2610 1.38E-04 0.5443 1.18E-04 0.6365 8.74E-05 0.1757 3.81E-05 0.3410 8.57E-05 0.6864 7.37E-05 0.8229 5.26E-05 0.2743 1.79E-05 0.4203 5.23E-05 0.7301 6.26E-05 0.8986 4.41E-05 0.4147 8.21 E-06 0.5161 3.11E-05 1.0449 3.20E-05 1.2591 2.14E-05 0.5200 5.37E-06 0.6283 1.77E-05 1.2560 2.21 E-05 1.4560 1.44E-05 0.6428 3.55E-06 0.7936 9.51E-06 1.4206 1.54E-05 1.6444 9.77E-06 0.9636 1.41 E-06 0.9000 7.08E-06 1.7228 6.74E-06 1.9126 4.03E-06 1.1880 8.42E-07 1.0464 4.65E-06 2.1900 2.52E-06 2.1900 1.44E-06 1.4388 5.1OE-07 1.3832 1.96E-06 2.6240 7.OOE-07 2.6240 4.16E-07 2.1648 1.59E-07 1.8744 5.99E-07 4.0000 7.31 E-08 3.9360 6.69E-08 3.2472 4.28E-08 4.8708 8.57E-09 As discussed under 6. below, the USGS Hazard Curves, which were plotted in Attachment 1, will be further discretized to provide better estimates of the SCDFs that may be compared to those presented in the NRC Report (Ref 1).

5. Derive parameters and develop mathematical formulation for all terms used in the SCDF calculations.

Parameters and mathematical formulations were discussed under Item 3. above, as the methodology used to calculate the SCDF was documented. Below, we cover all these parameters and formulations and provide, when appropriate, quantifications for use in the SCDF analyses for comparison against the NRC results.

As mentioned above, the methodology used to calculate the SCDF was incorporated into an EXCEL spreadsheet that contains, in Columns A through H, the parameters and formulations used. It is duplicated below:

Page 8 of 19

ENG REPORT PNPS-RPT-11-00001

!t-EnteWg Re-assessment of Pilgrim Seismic Core Damage Frequency A B C D E F G H Annual Hazard Curve Exceedance Interval Interval Interval Z Conditional Probability Probability Acceleration Freq Acceleration (a) Frequency In(a/Am)/!c of Failure of Failure a) Hazard Curve acceleration and annual exceedance frequency - The tabulation above contains in Columns A and B pairs of acceleration values and their corresponding annual exceedance frequency. While a "sample" run using this "raw" data will be presented and discussed below, the curves will be discretized further when calculating SCDFs for comparison with the NRC calculated values.

b) Acceleration interval, the interval acceleration (a) and the interval frequency are calculated values using the Hazard Curve information, as discussed under 3. above.

c) Z-Value - This is a calculated value based on the quantification of the following parameters:

0 The interval acceleration (a) - This value is calculated as discussed under 3.

0 The Median Capacity (Am) - When performing analyses using the USGS Hazard Curves and USGS spectra, the median capacities calculated using the 1989 EPRI ground spectra must be modified. As discussed under 2. above, the median capacities to be used for the 1 Hz, 5 Hz, 10 Hz, and PGA SCDF analyses are expressed in terms of C5 0 as follows:

Calculated Hazard Curve Median M ed Frequency Spectral Ratio Capacity Capacity (Hz) Formula PGA I 1 x C50 0.49 I Hz 0.50 0.50 x C5 o 0.245 5 Hz 1.66 1.66 x C5 o 0.8134 10 Hz 1.55 1.55 x C50 0.7595

  • The Composite Uncertainty coefficient (0c) - 13c is taken as 0.27, as discussed under 2.

above.

d) Conditional Probability of Failure and Probability of Failure - These values are calculated for each of the acceleration intervals (into which the Hazard Curve was discretized), and are contained under Columns G and H of the EXCEL spreadsheet header shown above.

e) Total Probability of Failure (SCDF) - This is a calculated value, equal to the summation of the probabilities of failure calculated for each acceleration interval.

An example of the use of these parameters and formulations for calculating the SCDF using the raw 1 Hz USGS Hazard Curve presented above is presented below:

Page 9 of 19

A

ý- Entergy ENG REPORT PNPS-RPT-1 1-00001 Reassessment of Pilgrim Seismic Core Damage Frequency Am - 0.49 x 0.50 f PNPS NRC Probability of Failure Solution 0.245 0.27 1Hz A B C D E F G H Hazard Curve Freg. Interval Interval Interval Z Conditional Probability Probability Acceleration Acceleration (a) Frequency ln(a/Am)/O3c of Failure of Failure (A12+A13)/2 (B12- B13) NORMDIST Z = (F12) E12 x G12 0.004 1.16E-02 0.005 0.00421 -14.41414925 2.10801E-47 8.87473E-50 0.006 7.39E-03 0.0076 0.00291 -12.86337023 3.6176E-38 1.05272E-40 0.0092 4.48E-03 0.0116 0.00191 -11.29723375 6.77083E-30 1.29323E-32 0.014 2.57E-03 0.01755 0.00117 -9.763719484 8.05673E-23 9.42638E-26 0.0211 1.40E-03 0.02695 0.000676 -8.175092271 1.4782E-16 9.99262E-20 0.0328 7.24E-04 0.04115 0.000366 -6.607534383 1.95387E-11 7.15115E-15 0.0495 3.58E-04 0.0629 0.000187 -5.035970544 2.37717E-07 4.4453E-1 1 0.0763 1.71 E-04 0.0963 0.0000901 -3.458481081 0.000271615 2.44725E-08 0.1163 8.09E-05 0.146 0.0000428 -1.917228107 0.027604479 1.18147E-06 0.1757 3.81E-05 0.225 0.0000202 -0.31539929 0.376229253 7.59983E-06 0.2743 1.79E-05 0.3445 0.00000969 1.262355111 0.896589483 8.68795E-06 0.4147 8.21E-06 0.46735 0.00000284 2.391926782 0.991619907 2.8162E-06 0.52 5.37E-06 0.5814 0.00000182 3.200669547 0.999314457 1.81875E-06 0.6428 3.55E-06 0.8032 0.00000214 4.397576068 0.999994527 2.13999E-06 0.9636 1.41E-06 1.0758 5.68E-07 5.479857923 0.999999979 5.68E-07 1.188 8.42E-07 1.3134 3.32E-07 6.218949123 1 3.32E-07 1.4388 5.10E-07 1.8018 3.51E-07 7.389937902 1 3.51E-07 2.1648 1.59E-07 2.706 1.16E-07 8.896179993 1 1.162E-07 3.2472 4.28E-08 4.059 3.42E-08 10.39790262 1 3.423E-08 4.8708 8.57E-09 4.8708 8.57E-09 11.07316764 1 8.57E-09 Total Prob of Failure 2.56787E-05 A discussion of the plant level SCDF obtained using the 1 Hz USGS seismic Hazard Curve is presented hereafter, together with a "manual" check of a few of the calculated conditional probabilities of failure.

Page 10 of 19

ENG REPORT PNPS-RPT-1 1-00001

  • Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency The upper right hand of the tabulation indicates for the 1 Hz analysis, the median capacity used was Am = 0.245g and the composite Pc was 0.27.

Columns A and B, containing the Hazard Curve Accelerations and Annual Exceedance Frequency are identical to the values presented here under 4. above.

Given the Z value, EXCEL calculated the Conditional Probabilities of failure, tabulated in Column G, using the NORMDIST Z function. A verification of two of the entries is presented below.

Where the table entries represent the area under the curve from the mean to the Z value:

S==.ol we:

l MoflW*sr md RoW IK Kuu.

WPtstck r twvy SWtyS is,. , lA-- i g Mmass: 1973). RtadMed with Mddp-tk, For the Z value of-0.315, which is entered for the row showing the acceleration of 0. 1757g, we round the value to -0.30 and the area in the table above is 0.1179. Therefore, the conditional probability of failure, which is the area starting from the left tail of the normal distribution to the Z-value, is 0.5, the area under the left half of the distribution plus the tabulated value, less 0.1179 which equals 0.3821. This compares favorably with the NORMDIST Z value of 0.376 (calculated for a z-value of -0.315 rather than 0.30).

For the Z value of 1.262, shown in the row for acceleration 0.2743g, the area from the Normal Distribution Table above is shown as 0.4032. Thus, the conditional probability of failure, (i.e.,

the area under the normal distribution curve from the left tail to the Z-value) is 0.5 + 0.4032 =

0.9032, which compares favorably to the NORMDIST Z value calculated as 0.89658.

Page 11 of 19

ct-Entergy ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency On a different note, the summation of all Probability of Failure entries calculated under Column H for all accelerations under Column A., or 2.57E-05, represents the Total Probability of Failure, or SCDF, for PNPS when considering the USGS 1 Hz Hazard Curve modified for soil conditions. Given the limited number of discretization points for the Hazard Curve, the value differs from the SCDF calculated in the NRC Report (Ref 1) which, as shown in the excerpt below, is 2.4E-05 for the 1.0 Hz Hazard Curve.

Table D-1. Seismic Core-Damage Freguencies Using 2008 USGS Seismic Hazard Curves.

Updated USGS IPEEE weakest Docket controlling simple weighted link Plant Name Number PGA 10 Hz 5 Hz 1 Hz max curve average average model Pilgrim 1 05000293 I4.3E-05 I6.9E05 62-0 .05 6.912-05 10 Hz 14.9E-05 5.0E-05 6.9E-05

6. Use the methodology and derived parameters and perform risk analyses that duplicate the NRC Report SCDFs for PNPS.

The methodology developed for estimating SCDF given Hazard Curves for different frequencies and the parameters derived under 5. above, were used in conjunction with the USGS Hazard Curves for which the acceleration interval was refined using a log-log interpolation between the raw acceleration data points for a 0.001g interval. Excerpts from the SCDF analyses for the PGA, 10 Hz, 5 Hz, and 1Hz Hazard curves showing the 0.001g discretization and the Total Probability of Failure for each Hazard Curve are presented in Attachment 3.

A summary of the results obtained using the methodology described above, against those reported in the NRC Report, shows full agreement:

PNPS Como~arison of Seismic CDF Results with NRC Estimates Hazard Median Seismic CDF Curve Capacity NRC Simplified Frequency (g) (Table D-1) Methodology PGA 0.49 4.3E-05 4.26E-05 10Hz 0.7595 6.9E-05 6.88E-05 5Hz 0.8134 6.2E-05 6.19E-05 1Hz 0.245 2.4E-05 2.40E-05 Excerpts from the EXCEL analyses using the USGS Hazard Curves for PGA, 10 Hz, 5 Hz, and 1 Hz are provided in Attachment 2. Due to the rather small acceleration interval of0.001g, the number of rows is excessive and, as such, only a limited number of acceleration values are excerpted.

Page 12 of 19

AN Enterv ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency The headings of the tabulations list the frequency of the Hazard Curve used (which was discretized to 0.00 lg intervals), the calculated SCDF for the specific Hazard Curve, and the plant level Median Capacity and P3c used.

References:

1. NRC, "Safety/Risk Assessment Results for Generic Issue (GI) 199, Implications of Updated Probabilistic Hazard Estimates in Central and Eastern United States on Existing Plants," dated September 2, 2010 (ADAMS Accession Number ML100270582)
2. Pilgrim Individual Plant Examination of External Events Report, July 1994.

Page 13 of 19

.. Ent&Wg ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Attachment 1 USGS Hazard Curves for PNPS Page 14 of 19

PNPS-RPT-1 1-00001

  • Entergy ENG REPORT Re-assessment of Pilgrim Seismic Core Damage Frequency USGS Hazard Curves 1.20E-03 1.10E-03 1.OOE-03

,9.OOE-04

-- I N ----- - --- - ----- --- -

8.OOE-04 PGA

, 7.00E-04 CL 10 Hz

  • 6.00E-04 5 Hz u 5.00E-04
  • 4.00E-04 Al------------- 1 Hz I--

x LU 3.OOE-04 2.OOE-04 t - I- i~n.q 1.OOE-04 O.OOE+00 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Acceleration (g)

Page 15 of 19

OREntergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency ATTACHMENT 2 Excerpts from SCDF Calculations for Various USGS Hazard Curve Frequencies Page 16 of 19

ENG REPORT PNPS-RPT-11-00001 Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency PGA USGS Hazard Curve 0.oM* .

.nterval I I Total S.iaic Core Damae Fr*

  • 4.26E45 Plant Mdiani Caaiy I Plant ComTposite Urocertalnty, pc 62 Frequency of Falr Delta RFda at Seihmnc Level (g) ExedneProbability g level 0.01__6.76E_0 9.21 E 38 5. 14E-41 0.016 6.1E3 1.76E-36 7.34-40 0.017 5.79E-03 2.71 E-35 9.93E-39 0.018 5.42E.03 3.42E-34 1.11E-37 0.019 5.10E-03 3.63E-33 1.06E-36 0,020 4.81E-03 3.31 E-32 5.96E-36 0.021 4.63E-03 2-63E-31 8.71 E-35 0.022 4.30E-03 1i.8E 4.12E-34 0.023 4.07E-03 1.16E-29 2.35E-33 0.024 3.87E0 6.61E2 1.22E-..

0.025 a69E03 3.43E-28 5.80E-32 0.026 3,52E-03 1.64E-27 2.54E41 0.027 3.36E-.03 7.22E-27 1.04E-30 0.2 322E-03 2.97E-26 3,06E-0 0.029 3.12E-03 1.1 SE25 1.81E-29 0.030 2.6E0 4.16E-25 4.92E-i29 0.031 2.84E-03 1.4~3E-24 1.7E2 0.032 2.73E-03 4,65E-24 4.77E-28 0.033 2.63E-03 1.44E-23 1,38E-27 0.034 2.53E-03 4.28.23 3.4E2 0.035 2,4E0 1.22E-22 1.02E-26 0.036 .6E-03 3.33E-22 2.63E-2 0.037 2.8E0 8.76E-22 6.52E-6 0.038 2.20E-03 2.23E-21 1.56E-25 0.39Z13E-03 5.48E21 4.08E-25 0.040 2.06E.03 1.31 E-20 7.34E-25 0.041 2.OOE403 3,03 0.042 1.94E-3 B. E-20 3.95E-24 0.043 1.SSE-03 1,50E-19 8.21 E-24 0.044 1.3E0 3.20E-19 1.67E-23 0.045 1.78E.03 6.69E-19 3.31E-23 Last rows of the EXCEL spreadsheet are below:

1.870 6.05E-07 1.00E+O0 1.26E-09 1.871 6.04E-07 1 OOE+00 122E-09 1.872 6.02E-07 1.00E+O0 1.26E-09 1.873 6.01 E"07 1.001E+00 1.75E-09 1.874 5.99E-07 1 OOE+00 5.99E-07 Page 17 of 19

i ENG REPORT PNPS-RPT-11-00001

  • Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency 10 Hz USGS Hazard Curve 0.*01i n *trals Total Seismc Cone Dem F uen = I 6.88E-o I Plant Median Capacit 0.7595 Plant Composite Uncertainty, 1c 0.27 Frequency of Faiur Delta Risk at g Seismic Level (g) Exceedance Probability level 0.018 .04E-02 2.25E-43 18.40E46 0.019 9.78E-03 3.28E-42 1.56E-45 0.020 9.31E-03 4.03E-41 1.74E-44 0.021 8.88E-03 4.26E-.40 1.67E-43 0.022 8.48E-03 3.93E-39 1,41 E-42 0.023 8.13E-03 3.20E-38 1,05E-41 0.024 7.80E-03 2.33E-37 7,08E-41 0.025 7.49E-03 1.54E-36 4.31 E-40 0.026 7.21 E-03 9.23E-36 1.35E-39 01027 -7T M 5.08E-35 1.94E-38 0.028 6.68E-03 2.59E-34 6,25E-38 0.029 6.44E,.3 1.23E-33 2.76E-37 0.030 6.22E-03 5.43E-33 1,14E-36 0.031 6.01E-03 2.26E-32 4.44E-36 0.032 5.81E-03 8.87E-32 1.63E-35 0.033 5.63E-03 3.30E-31 5,71 E-35 0,034 5.45E.03 1.17E-30 1.90E-34 0.035 5.29E-03 3.93E-30 6.05E-34 0.036 5.14E-03 127E-29 1,84E-33 0.037 4.99E-03 3.92E-29 5.39E-33 0.038 4.85E-03 1.1 7E-28 1.83E-32 0.039 4.70E-03 3.34E-28 3.41E-32 0.040 4.59E-03 9.25E-28 1.14E-31 0.041 4.47E-03 2.48E-27 2.89E-31 0.042 4.36E-03 6.43E-27 7.15E-31 0.043 4.24E-03 1 62E-26 1.71E-30 0.044 4.14E-03 3.97E-26 4.OOE-30 0.045 4.04E-03 9.46E-26 9.12E-30 0.046 3.94E-03 2,20E-25 2.02E-29 0.047 3,85E-03 4.99E-25 4.40E-29 0.048 3.76E-03 1.11 E-24 9.33E-29 Last rows of the EXCEL spreadsheet are shown below 3.996 1 7.35E-08 I 1.OOE+00 I 9.85E-1 1 1 3.997 7.34E-08 I 1.OOE+00 9.83E-1 1 3.998 7.33E-08 1.00E+00 9.82E-1 1 3.999 7.32E-08 1.00E+00 9.80E-1 1 4.000 7.31 E-08 1.OOE+00 7,31E-08 Page 18 of 19

ENG REPORT PNPS-RPT-11-00001

  • Enterg Re-assessment of Pilgrim Seismic Core Damage Frequency S lb USGS Hazard Curve 4*1iIntervala
  • Sm s ucs a F = 1 6.19 P flanMdanCpaciy 0834 U1 Pat HLF a P~nomoieUncditO 0-271 0.021 13E0 1.4241 5.12E-45 0.02 121 E-02 1.16E-39 6.45E-43 0,024 1.1 6E-02 8,77E-39 4.48E-42 0.025 1.11E-02 6,OOE-38 2.82E-41 0.02 1.06E-02 3.73E-37 1.62E-40 0.027 1.02E-02 2.13E-36 8,53E-40 0.028 9.77E03 1.12E-35 4.16E-39 0.029 0., I 9.4E03

.DE0 5.48E-35 2.50E-34 1.89E-38 80E3 0.3 8.73E-03 1.07E-33 3.1 7E-37 0,032 8. -03 4134E-36 0.3 , E0 1.66E-32 4.70E-36 0.034 7,85E03 6.03E-32 1.60E-35 0.035 7.58E-0 2.09E41 5.1E3 0.036 7, -03 6IE-31 1.62E-34 0.037 7.10E-3 2.1 9E-30 4.*5E-34 0.038 6.87E-03 68 -30 1.40E33 0.040 0.039____ 6.7E-03 6.67E-03 5256E-2.9 1.96E-29 1.04E 3.70E-33 0.04 1 56,2E-03 1.5,2E-28 .

00 5.94E-03 1.0 1 2-3 0.04 5.48E,07 3 1.7,5-25 2.2E-0.050 494&03 3.77E-25 4.67E-29 0.051 4.81 8.3 I7.99E-25 9.47E-29 Last rows of the EXCEL spreadsheet are shown below:

1 3.932 1 6.72E-08 11.00E+00 I 7.70E-1 1 3.933 8.71E-08 1.00E+00 7.69E-11 3.934 6.70E-08 1.00E+00 7.68E-11 1 3.935 1 6.69E-08 I 1.008+00 I 7.67E-1 1 I 3.936 1 6.69E-08, IE+00

1. I 6.69E-08 I Page 19 of 19

,_Entergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Attachment 3 Revised SCDF for PNPS Using USGS & EPRI Hazard Curves

ENG REPORT PNPS-RPT-1 1-00001 c-Enterg Re-assessment of Pilgrim Seismic Core Damage Frequency Prepared by: Paul Baughman, PE Reviewed by: Dan Nuta, PE John Bretti Assessment of the Effect of Identified Conservatisms on the SCDF Estimates Obtained Using the USGS Hazard Curves.

Seismic core damage frequency analyses using the 2008 USGS Seismic Hazard Curves used by NRC for 1 Hz, 5 Hz, 10 Hz, and PGA, discretized to acceleration intervals of 0.001g by log-log interpolation, were performed using fragilities adjusted for identified conservatisms. The analyses consist of convolving the USGS Hazard Curves for different frequencies with the various fragilities.

A description of the analyses performed is as follows:

Analyses Series I - NRC plant-level fragility, Am = 0.49g and Pc = 0.27, with m10 = 1.55, m5 = 1.66, and in = 0.5.

Analyses Series 2 - Entergy revised fragility, Am = 0.57g, and Pc = 0.23. This fragility reflects changes in the plant model, plant modifications and removal of conservatism in fragilities.

Analyses Series 3 - Entergy SHIP-adjusted revised fragility, Am = 0.63g, and P3c = 0.34. This fragility reflects adjustment of the Entergy revised plant-level fragility so that the SCDF using the PGA hazard curve matches the SHIP-calculated SCDF.

Results from the analyses are presented below.

Analysis Series - 1 2 3 Hazard Curve NRC Reported Entergy Am = SCDFs Frequency Entergy SCDFs Entergy SCDFs SCDF .49g Am =.57g Am = .63g Estimates P3c = .27 Pc = .23 3c = .23 PGA 4.3E-05 4.26E-05 2.78E-05 2.14E-05 10 Hz 6.9E-04 6.88E-04 4.88E-05 3.98E-05 5 Hz 6.2E-05 6.19E-05 4.36E-05 3.53E-05 I Hz 2.4E-05 2.40E-05 1.79E-05 1.49E-06 Page 1 of2

".Entergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Assessment of the Effect of Identified Conservatisms on the SCDF Estimates Obtained Using the EPRI Updated Hazard Curves.

Seismic core damage frequency analyses using updated hazard curves developed by EPRI for 1 Hz, 10 Hz, and PGA, discretized to acceleration intervals of 0.001g by log-log interpolation, were performed using fragilities adjusted for identified conservatisms. The analyses consist of convolving the EPRI updated hazard curves for different frequencies with the various fragilities A description of the analyses performed is as follows:

Analyses Series I - NRC fragility values, Am = 0.49g and P3c = 0.27, with mi1 = 1.55, m5 = 1.66, and in,

= 0.5.

Analyses Series 2 - Entergy revised fragility, Am = 0.57g, and Pc = 0.23. This fragility reflects changes in the plant model, plant modifications and removal of conservatism in fragilities.

Analyses Series 3 - Entergy SHIP-adjusted revised fragility, Am = 0.82g, and P3c = 0.34. This fragility reflects adjustment of the Entergy revised plant-level fragility so that the SCDF using the PGA hazard curve matches the SHIP-calculated SCDF.

Results from the analyses are presented below.

Analysis Series 1! 2 3 NRC Reported Entergy SCDFs Entergy SCDFs Entergy SCDFs Hazard Curve SCDF Am =.49 Am = .57 Am = .82g Frequency USGS-Based = .27 PC.23 PC = .23 Estimates PGA 4.3E-05 3.11E-05 2.54E-05 1.46E-05 10 Hz 6.9E-04 2.74E-05 2.20E-05 1.22E-05 5 Hz 6.2E-05 n/a n/a n/a 1 Hz 2.4E-05 1.87E-06 1.29E-06 5.57E-07 Page 2 of 2

ENG REPORT PNPS-RPT-11-00001

'%-EntergY Re-assessment of Pilgrim Seismic Core Damage Frequency Attachment 4 Revised Calculations for Identified Low Capacity Components

En y ENG REPORT PNPS-RPT-1 1-00001

!ý--Entergy Revised Calculations for Identified Low Capacity Components Prepared by: Paul Baughman Reviewed by: Dragos Nuta This attachment shows the calculations done in revising the fragilities of identified low capacity components.

Background

The low capacity components to be examined for conservatism in the fragilities were identified by running the SHIP program and successively increasing the median capacity of each component to 2g, well above the surrogate element capacity. Note that the term "component" refers to a component event of the SPRA systems model, not necessarily a component in the plant.

For each component in the list, the basis for fragility is examined, to the extent possible in a limited amount of time, for excess conservatism in the median capacity. The median capacity will then will be revised to account for the removal of the conservatism.

The table below shows the components that were identified for investigation, ranked by potential reduction in risk. The table gives the fragility values used in the original SPRA. Median refers to the median capacity of the component in terms of peak ground acceleration. Beta-c refers to the composite variability. HCLPF refers to the high confidence of low probability of failure capacity.

Page 1 of 14

REPORT PNPS-RPT-11-00001 t-Entergy ENG Revised Calculations for Identified Low Capacity Components Numbern Name Median Beta-C. HCLPF Component Description ELOSP)000Z- 0.35 0.55 0.141 LOSS OF OFFSITE POWER- ---- -

2 Ef N2O4ABXZ 0.61 0.46 0.286 QUAD ROOM COOLER FANs 204A/B FAILURE 29 EFN204CD)Z 0.61 0.46 0.286 QUAD ROOM COOLER FANs 204C/D FAILURE 3 JERE18781!Z 0.25 0.597 0.065 SEISMICALLY INDUCED CHATTER OF RELAY 187-801A 6 JERE132X9'7Z 0.55 0.597 0.142 SEISMICALLY CORRELATED RELAY CHATTER OF 132-509 AND 609 7 IERE159X9!Z 0.55 0.597 0.142 ISEISMICALLY CORRELATED RELAY CHATTER OF 159-509 AND 609 (1 AND 2) 36 !EBW209/0)Z 0.82 0.46 0.384

- BLOCK WALL 209.0 FAILS 35 EBDDGBLD)X _0.77 L_0.46 J 0.36 DIESEL GENERATOR BUILDING FAILS 45 _EBW45/3)0 .___1.071-0.46 -_0.501 BLOCK WALL 45,.3 FAILS 33 - EBSA8)0 Z... 0.96 1 0.47 0.323 1A8 BUS FAILURE j 37 IEBSB2)000Z 0.84 0.46 0.393 SEISMICALLY INDUCED FAILURE OF BUS B2 43-- IEPM184A)0

  • - 1.05_ _0.46 0.492 IBODG FUEL OIL PUMPP184 FAILURE 13 !ERE16059!Z 0.89 0.597 0.23 {SEISMICALLY CORRELATED RELAY CHATTER OF 160-509
14 E 8159,z _ 0.89 0.597 0.23 SEISMICALLY INDUCED CHATTER OF RELAY 181-509 15 ERE18759IZ 0.89 0.597 0.23 ISEISMICALLY INDUCED CHATTER OF RELAY 187-509 16 IERE27A5XIZ___ 0.89 0.597 0.23 SEISMICALLY INDUCED CHATTER OF RELAY 127-A5X 32 EDLGEAB)X__ 1.39 -0.654 0.32 SEISMICALY INDUCED DIESEL GENERATOR A/B CORELATED FAILURE 42 -EFN207A-DZ 1.01 0.46 0.473 VAC207A- FAILS RBCCW PRESSURE BOUNDARY 23 -- zRE15169. 1.04 0.597 0.269 SEISMICALLY INDUCED CHATTER OF 151V-609/AB,C 24 TERE16069!Z 1.04 - 0.597 0.269 SEISMICALLY CORRELATED RELAY CHATTER OF 160-609 25 iERE18169!Z 1.04 0.59_7 0._.269 SEISMICALLY INDUCED CHATTER OF RELAY 181-609 26 ERE18769!Z 1.04 0.597 0.269 SEISMICALLY INDUCED CHATTER OF RELAY 187-609 2-- ERE27A6XZ 1.0 0.57 0269 SESIAL NDCDCATRO-F-RELAY 127-A S44 EFNDWCOOLZ ERE328017AI 1.06

_]1.04 0.46 0.496 FAILURE OF VAC205 OR 206 FAMILY OF FAN COOLERS 0._597 -I0269SEISMICALLY 0 INDUCED CHATTER OF RELAY 132-8A6 17 ERE51N81!Z 1 .50.597SEISMICALLY INDUCED CHATTER OF RELAY 151N-801A 19 JERE51NG8!Z 1 0.597 0.258 SEISMICALLY INDUCED CHATTER OF RELAY 151NG-801A 201 JERE51V81'Z 1 0.597 0.258 SEISMICALLY INDUCED CHATTER OF RELAY 151V-801A "21 ERE59801Z _1 0.597 0.258 SEISMICALLY INDUCED CHATTER OF RELAY 159-801A

_ 31 ERE2352).Z 1.2 0.597 0.31 SEISMICALLY CORRELATED RELAY CHATTER OF 23A-K52A AND B 46 JEFN201AB)( 1.23 0.46 0.576 HPCI ROOM COOLING FANs VAC201A/B FAILURE 47 EFN202AB)Z 1.23 0.46. 0.576 VAC202A&B FAIL RBCCW PRESSURE BOUNDARY 48 1EFN203AB)Z 1.23 0.46 0.576 CRD QUAD ROOM COOLING FANS VAC 203A/B FAILURE 49 ECMK103ABZ 1.28 0.46 0.599 DIESEL STARTING AIR COMPRESSORS K103AIB CORRELATED FAILURE 50 EPM141ABXZ 1.28 0.46 0.599 DIESEL FUEL OIL PUMPS P-141A/B FAILURE 51 -EVPEAB)00( 1.28 0.46 0.599 DG A & B SEIS CORREL FUEL OIL PRESSURE REG VALVE E FAILURE 52 IEVRCAB)00__ 1.28 0.46 0.599 DG A & B SEISMICALLY CORRELATED FUEL OIL RELIEF VALVE C FAIL 53 1EVS4565CDZ_ 1.28 0.46 0.599 DIESEL AIR PSV4565C AND D SEISMIC CORRELATION FAILURE 22 ERE127691Z 1.04 0.5971 0.269 SEISMICALLY CORRELATED CHATTER OF RELAY 127-609 AND 159N-609 30 ERE1425B!Z 1.14 0.597 1 0.295 SEISMICALLY INDUCED CHATTER OF 420-1846 34 ERE18681!Z 1.34 0.597 0.346 SEISMICALLY INDUCED CHATTER OF RELAY 186-801A 38 ERE2759)]Z 1.55 0.597 0.401 SEISMICALLY INDUCED CHATTER OF 127-509X 39 ETKT105ABZ 0.94 0.46 0.44 CSTs T105A/B FAILURE K 40 41 4

IEBW210/0)Z

  • EBW195/23Z

!ETK105ABNZ 1.65 1

0.16 0.572 0.46 0.46 0.441 0.468 0.075 BLOCK WALL 210.0 FAILS BLOCKWALL 195.23 FAILS CST 105 A/B FAILS DUE TO N2 TANK INTERACTION 8 ERE40801!Z 0.67 0.597 0.173 SEISMICALLY INDUCED CHATTER OF RELAY 140-801A 9 ERE468018Z 0.67 0.597 0.173 SEISMICALLY INDUCED CHATTER OF RELAY 146-801A 10 ERE1865)QZ 0.73 0.597 0.189 SEISMICALLY INDUCED CHATTER OF RELAY 181-5X 12 ERE15159Z 0.89 0.597 0.23 SEISMICALLY INDUCED CHATTER OF 151V-509/A,B,C 1 EISLOCACSZ 0 0.46 0 SEISMICALLY INDUCED CORE SPRAY PIPE RUPTURE 2 EISLOCRHRZ 0 0.46 0 SEISMICALLY INDUCED RHR PIPING RUPTURE 11 ERE12759!Z 0.89 0.597 0.23 SEISMICALLY CORRELATED CHATTER OF RELAY 127-509 AND 159N-509 54 EBW198/1XZ 3.43 0.792 0.607 BLOCK WALL 198.1 FAILS 55 EBW1 98/2)XZ 3.43 0.792 0.607 BLOCK WALL 198.2 FAILS Page 2 of 14

NEntergy ENG REPORT PNPS-RPT-1 1-00001 Revised Calculations for Identified Low Capacity Components Identification of Conservatism There are four groups of components in the table above whose median capacities can be modified:

1. Component failures that can be eliminated from the model
2. Relay chatter failures
3. Block wall failures
4. Other component failures Component Failures that can be Eliminated from the Model The first component in the table above, LOSS OF OFFSITE POWER, cannot be changed without further research. The next two components, QUAD ROOM COOLER FANs 204A/B FAILURE and QUAD ROOM COOLER FANs 204C/D FAILURE are no longer required to be in the model due to systems consideration. EFN201ABXZ and EFN203ABXZ-CRD, quad coolers and HPCI room coolers, are also not required. EKTI05ABNZ, CST 105 A/B fails due to N2 tank interaction, is also not required because the N2 tank anchorage has been upgraded, eliminating the interaction. These components are not examined further. The median capacities of these components are set to 2g in order to effectively eliminate them from contribution to risk.

Relay Chatter Failures Two relay fragilities were revised, ERE132X9!Z and ERE159X9!Z. The relay fragility calculations are documented in C-015 (Stevenson & Associates, C-015: Relay Fragility Analysis for Seismic PRA (BECo SUDDS/RF 94-10)).

EREI32X9!Z (Relays 132-509 and 132-609):

The properties of ERE132X9!Z (132-509 and 132-609) from C-015 are shown below (from C-0 15). 132-609 is the same.

Relay 9 Basic Event Panel Loc, r.1i f9 Model GGERS Values 1g) Medianr Median Lesser Peak above 33 Frag1lty Fragilty Fragility I (Peak) IqZPA* .!I DCFTI(A) EREDCFTAZ CIDI OG23 Agestat 2412PO 12.5 5 1 2-75 1 2 7c  :.76s 132-S09 ERE13259!Z C101 DG23 west CAN.1 UsCA-45 UseA-46 055 1 C'55 055 demand demand Page 3 of 14

PNPS-RPT-1 1-00001

ýý-Entergy ENG REPORT Revised Calculations for Identified Low Capacity Components The fragility for relay 132-509 was not based on a GERS (Generic Equipment Ruggedness Spectrum, from EPRI NP-7147-SL, "Seismic Ruggedness of Relays," August 1991, and supplements); rather, it was based on just meeting the A-46 (NRC, "Verification of Seismic Adequacy of Mechanical and Electrical Equipment in Operating Reactors, Unresolved Safety Issue (USI) A-46," Generic Letter 87-03, February 1987) capacity requirement. A GERS now exists for the Westinghouse CRN-I relay. It is in Group 18 of EPRI NP-7147-SL, "Seismic Ruggedness of Relays," V2, Addendum 2. The GERS data for Group 18 is presented below.

Fragility level refers to the spectra acceleration in the 4-16 Hz range for which the relay contacts will not chatter. There are four relay contact states: non-operate (de-energized) and operate (energized), and, for each of those, NO (normally open) and NC (normally closed). The GERS fragility level is given for each contact state. The ZPA acceleration is 60% of the 4-16 Hz acceleration per EPRI NP-7147-SL.

Table 2-1 Test Fragility Levels tot Relay Test Groups 13 tIrough 20 (contlnud)

Zagidty(' LWevh 2

TusI Group 16. Md"l4 ) _ __

KO IM NO me E_12lAM __

6M.~

-.....7 10 ,

L,2 7

NA NA l~fl~O$ .. L..J 10 NIA AV.0 i24A1 10, -- 0o GE J 1R¶!0 10 to 10

e. .*_ 10 IQ 10o 10 (3e ]12HGlA10 j6 MR ý!A 10 1&HFA1,lAtMV l_ it NA _NA, NA OFeye" 4471 NA*I 5;C'z' NA* 1,,, N "A

NA Wk 1*r' 4 NA A CH w I10-0 CY. .2,.10 iL 10 *-..-

  • e W V4 a. 46 , 9, NA A!EMOC 166 J.J.1 ID 10 Teao e up Ie. _ _21, 1 GE 121AVSK ____ 7 2 10 W j GD-1 7 L I4 .$ NA 800 050-- I0 1 10 1 10 AS= ýO NA 1+ MA CS 10 to0 AB __ __" _ __ 10+/- 10l 0 1*

The entry for these relays from the A-46 Essential Relay List is shown below. The far right columns give the operational state.

101 32-Wg r-491 ES OL2 DO0A 27rT wadf'eP. CRNdd NO AN ASOS NO 640 lit i32.tSS C102 Es 0L2 Dr. 27 T W000timo Cf64-i NO No The list above shows the relay state is normally open (NO) and de-energized (No in far right column). Therefore, the GERS fragility level is 7g. The ZPA level is 60% of this, or 4.2g.

Page 4 of 14

1"Entergy ENG REPORT PNPS-RPT-1 1-00001 Revised Calculations for Identified Low Capacity Components The GERS accelerations are converted to median capacities for Pilgrim using scale factors. The table of scale factor from C-015 is shown below.

MCC Canital swicligear sPRA 0.a - TvOe BSwthbolcd Tvoe Loc.iorn EW EW NS "S Peak ZPA Peak ZPA Peak ZPA Peak ZPA Peak ZPA --

D623 0.783 0.320 0.802 0.305 0.2-12 0.57 0.222 0557 0.167 0418 GND23 0.724 0.400 0.724 0.400 0290 0.52S 0.246 0.446 0. 185 0 33-:

RB23 0318 0.211 0.330 0.195 0.692 1.083 0.587 0.919 0441 0689 RW23 0.17 0.214 0.489 0207 0.442 1,060 0.375 0906 028l 0679 RW37 050 0-216 0.497 0.259 0.431 0,682 0,366 10.746 0 27 0 51 T823 0.536 0.268 0483 0.267 0,425 08521 0360 0 7.'3 0 V70 05.2 TO37 0.6n- 0276 0611 0281 0.363 1.0613 0309 0 690 0 -31 0617 The panel C I01 is a control benchboard at location DG23. Therefore, the median capacity, per the table above, is the lesser of 0.222 times the 4-16 Hz spectral acceleration or 0.557 times the ZPA acceleration. Considering the GERS for the Westinghouse CRN-1 these calculations are:

0.222 x 7.Og = 1.55g 0.557 x 4.2g = 2.34g Therefore, the median capacity of ERE1 32X9!Z is 1.55g.

EREI59X9!Z (Relays 159-509 and 159-609):

The panel and location of the 159-509 and 160-509 are shown below (from C-0 15):

Relay # Basic Event Panel Loc. Mtgr Model 0 GERS Values 1g) Median Median Lesser Peak above 33 Fragiliy Fragility I Fag~ility

- _____________ _____ .jPeakb*g 3fZPAI ,l{ jg1 D 023 Agaslal 2412Po 12.5 I 2.78 27A=- J7S DCFTI(A) EREDCFTA!Z C101 132.509 ERE13FA9IZ ClO OG23 West CRN-t _ Use _05,1 A-49 Use A461 055 C 555

_demand demand 159-509 1 ,2 ERE159592 C101 OG23 GE SV Use A.46 Use A-46 055 0 o5 05 1 demand demand DCFTI(B) EREOC.FTB! C102 OG-3 AWt1 2412PD 12.5 5 271 :7[ý 271 132-609 ERE13269gZ C102 DO 23 Wes CRI.i Use A-49 UseA-44 055 0 sr, 055, demand demand I_

159.609 1a2 EREASIW9Z C102 M23 CE S£V Use A,46 Use A-4 055 CSS 055

.... . . . I. I.. I -- demand I demand I As reported by PNPS personnel, ERE159X9!Z has been changed to a ABB 59N relay. This relay has been qualified by ABB Report RC 5139-B (BECo SUDDS/RF 96-16).

Page 5 of 14

S ENG REPORT PNPS-RPT-1 1-00001

ýz-Entergy Revised Calculations for Identified Low Capacity Components The cover of the seismic qualification report is shown below.

SEISMIC ftenter: *C'5S39 ASEA BROWN BOVERI !ar . f bate: ID/fl/SI Tik: 27ig UN*ITRVOLTmE Im~l. A Dt, 019e Prep. by: a. Conrad Test Model  : Cat. i Z1IT175 Test Procedure - Per AM Specification RC-20tl-S to =et the reqoitanents of ANSI C37.98 (lttE-S01-1978).

Test Facility  : ST. Acton Divisico, Acton, Muss.

Documentation UTS/ACTCN report 1i1333-63N Relay Sectings and Status mottoring (Page 2)

Test ilesponse Spactra (Pale 3)

Testing A broad-band, *nlti-frequency vhbraiaon, of 30 eeconds duration, Lpesad biaxial at ar , in foter erlentatloner

1) Left-to-rrlhz
2) Front-to-back
3) Risbt-to-lefc
46) Back-to-front For 'a Orientataton, the relay status is tested and nenitored in three functional states;
1) )fo-operstatinu (i.e. not pictted up, etc.)
2) Operated (i.e. tripped, etc.)
3) Traosiriaoal The required cobiftations total 12 foll-level tests.

Results  ; o fragility or.nis-operatiett ws found uithio the 6g ZPA limitation of the actuator.

Notes The biaxial naton predates an acceleration with equal vertical end horizonte.al ompsnca, rhue yielding a total ZPA of 8.g at 45 . The TS shove the vertical coeponent. as analyzed at oane third octave intervals between I and 100 Alt. The *AUlydis is shown for damping flators of 5, 3, 2, and It.

Generic Other relays qualified by this teat eeriest All ala typt 27*1 relays, saries eiST All ABl type 5I relays, aeriea I1LU Test case models are also qualified by this report in

.colanjscInwith supplementary "eeto (Aenon 2461639" ,

5/25/80E, uioi test levels equal to or grester than the TRS shown on page 3 of this report:

Al& Alt type 271t relays, series 411T All .ABB type 9INrelays, series "1iU This is *the sywevrty of ASiE M*MO gotisi andtantl*ien prspietary an eonfiderntialinfltle

.514h reit nf% M Cup'itat or disclosed etherthapas esxeessly authorized tby ASiEFI Bul.OME Page 6 of 14

ENG REPORT PNPS-RPT-I 1-00001

  • Entergy Revised Calculations for Identified Low Capacity Components The Test Response Spectra are shown below:

The ZPA of the TRS is 6g and the 4-16 Hz range is 2.5 x 6g = 15g. This applies to all operating states.

To be conservative, the 4-16 Hz range will be taken as lOg and used to obtain the median capacity. The 5%-damped TRS plot shown in the report has a peak spectral acceleration of 15g, but the test was a bi-axial test performed with the specimen mounted at 45 degrees. It is not clear if the TRS has been adjusted for this, so be conservative it is de-rated by a factor of 1.4, giving about 10g. The ZPA will likewise be de-rated to 4g. This is sufficient to give a good median capacity.

Page 7 of 14

1"Entergy ENG REPORT PNPS-RPT-1 1-00001 Revised Calculations for Identified Low Capacity Components The panel and location of the 159-509 and 160-509 are (from C-015) C101 and C102. These are control benchboards located at DG23. The median capacity is lesser of 0.222 times the 4-16 Hz acceleration of 10g, or 0.557 times the ZPA.

0.222 x lOg = 2.22g 0.557 x 4g = 2.23g Therefore, the median capacity is 2.22g.

Block Wall Failures The fragility calculations for block walls are documented in Stevenson & Associates, C-017:

Estimated Fragilities for Blockwalls for Pilgrim Station Seismic PRA (BECo SUDDS/RF 94-10).

The following summary of results is from C-017:

Summary of Results Initial Seismic Building Elevation Wall No. Estimation Fragility Am(SSE)1 JAm)

Intake 21".4 45.01 0.67 g 0.67 g Structure 21'-6" 45.02 0.66 g 2.39 g 21'-6" 45.03 0.66 Q 1.07 g 511-0" 64.05 0.65 g 0.72 g Reactor 511-01 65.06 0.65 g 3.82 g Building 74'-3" 66.22 0.49 g 2.92 g 74'-3 66.24 0.499 2.92 g Reactor Aux. Bay 3T-0 185.01!1 0.86 g 1.41 g Radwaste 23'-0" 194.22 0.49 g 3.33 g Building 37'-0" 195.23 0.42 g 1.09-_

23'-0" 198,00 0.32 g 2.299 Diesel Generator 23'-0" 198.01 0.32 g 0.55 g' Building 23'-0 198.02 0.32 g 0.56 g' 23Y-0" 198.03 0.32 9 2.29 g 23'.0. 209.00 0.49 g 0.82 g 23'-0*' 209.01 0.49 g 1.72 g Turbine 37'0" 210.00 0.42 g 0.54 g' Building 371.-0 210.01 0.429 1.84 g*

37'.0' 210.02 0.42 g 2.35 g 37'-0" 210.03 0.42 g 0.549g

  • NOTE: Fragilityanalysis for blockwalls 198.01, 198.02, 210.00 and 210.01 superseded by detailed fragility analysis in calculation91C2672-C012 Page 8 of 14

act-Entergy ENG REPORT PNPS-RPT-11-00001 Revised Calculations for Identified Low Capacity Components Block walls 45.03, 209.00 and 195.23 had fragilities obtained by factoring the IE 80-11 (NRC, "Masonry Wall Design," IE Bulletin 80-11, May 1980) results. Note that these walls are labeled 45.3, 209.0 and 195.23 in SPRA fragility table.

The block walls 45.03, 210.00 and 195.23 have fragilities calculated by factoring the A-46 anchorage calculation. The following is from C-017:

To convert a HCLPFM, value to a median capacity two variables It = 0.40 and is, = 0.20 are used as discussed on pages 3-4, 5-5, 5-6 of Ref. 3, Then the median capacity (Ac) is calculated according to pages 2-22 and 2-23 of Ref. 3:

e:,

A, = (HCLPF 5,- -- x Amplification Factor EQ 1 etl

= 0.15g x2.1 x 2.1 = 0.66 g S&A performed Soil Structure Interaction for the Pilgrim Station using a reference peak ground acceleration of 0.4g (Ref. 1). The resulting floor spectra from this analysis establish the relationship between spectral accelerations on building floors, and a 0,4g PGA seismic input using the SPRA spectral shape. On the basis of this analysis, the median fragilities of blockwalls (i-e. the A, values) can be calculated by ratioing the spectral ordinate S,,spR) of the appropriate response spectrum anchored to SPRA PGA.

=0.4 g to the median capacity A, = 0.66 g:

A,,(SSE) = S#.smpR-- Ac xO.4g E02 The 2.1 Amplification Factor is explained below:

For conservative estimation of the HLCPFe values for the blockwalls the factor of 2.1 is employed. This factor represents approximation of the ratio of spectral peak acceleration over ZPA value at ground level.

C-017 contains a table of amplification factors based on building and elevation, shown below:

Location 7% Damped Peak Amplification Factor Diesel Generator El 23'-0 . ......... 399.......... 2.60 Intake Structure El 21'.6"......... 1.23g .......... 8.20 Reactor Building El 51'-0" .................. 1,48g ................. 9.87 Reactor Building El -0"............ g........... 4,07 Radwaste El 2-0".............. 1.359.......... 9,00 Radwaste El 37'-0"- .. ................... 0.679 .. .............. 4.47 Turbine Building El 2"-0".................... 1.359 .......... 9.00 Turbine Building El 37-0" ....... ....... 1.8g .. ............. 12.60 Page 9 of 14

S Entergy ENG REPORT PNPS-RPT-1 1-00001 Revised Calculations for Identified Low Capacity Components Wall 45.03 is at Intake Structure El. 21'6". The amplification factor is 8.20. Wall 195.23 is at Radwaste Building El. 37'-0". The amplification factor is 4.47. Wall 209.00 is at Turbine Building El. 23'-0". The amplification factor is 9.00. These amplification factors could have been used instead of 2.1.

The initial median capacity Am(SSE) was calculated assuming the wall had a capacity/demand ration of 1.0 under the SSE seismic demand in the 80-11 evaluation. The final seismic fragility median capacity Am was calculated by factoring the initial capacity by the actual capacity/demand ratio in the 80-11 calculation. These calculations are shown in C-017. No excess conservatism was noted in the 80-11 capacity/demand factor.

There are two sources of conservatism in these block wall fragilities. The first is the reduction for the peak-to-valley variability in the ground response spectra. For the block walls, this factor is 1/1.35. The USGS and updated EPRI Hazard Curves include this variability; therefore, it should not be included in the fragility calculation. This means that the median capacities can be increased by 35%. The second source is the building amplification factor. A multiplying factor of 2.1 was used for all of the walls in C-017, yet table of building amplification factors on Page 5 of C-017 gives amplification factors between 2.6 and 12.6. For the three block walls 45.03, 209.00 and 195.23 the building amplification factors vary from 4.47 to 9.00, which are 2.12 and 4.29, respectively, times the 2.1 factor used in the fragility calculation. Thus, the median capacities can be multiplied by a factor of at least 2. Multiplying the C-017 fragilities by 2, and also by 1.35, results in median capacities for the three block walls above 2g. For the purpose of this evaluation a median capacity of 2g is used.

Other Component Failures There are many components with a composite variability of 0.46. This indicates that the fragility was derived by factoring the USI A-46 anchorage capacity. These components are candidates for removing conservatism. Fragilities of components with composite uncertainty different than 0.46 were obtained by full fragility analysis. These are not examined for conservatism. Note that the standard composite uncertainty for relays is 0.597 rather than 0.46.

The following components had median capacities based on factoring the A-46 anchorage calculations.

Page 10 of 14

'Enterg ENG REPORT PNPS-RPT-1 1-00001 Revised Calculations for Identified Low Capacity Components Name Me4dian Beta -C HCLP F __Component Descriptlon EBDDGBLD)(Z 0.77 0.46 0.36 DIESEL GENERATOR BUILDING FAILS EBSB2)000(Z 0.84 0.46 0.393 SEISMICALLY INDUCED FAILURE OF BUS B2 II f i

ý 43 EPM184A)0( 1.05 0.46 0.492 BODG FUEL OIL PUMP P184 FAILURE 42 EFN207A-DZ 1.01 0.46 0.473 VAC207A-D FAILS RBCCW PRESSURE BOUNDARY EFNDWCOOLZ 1.06 0.46 0.496 FAILURE OF VAC205 OR 206 FAMILY OF FAN COOLERS 492 50 ECMK103ABZ EPM141ABX(Z _

1.28 1.28 0.46 0.46 0.599 0.599 DIESEL STARTING AIR COMPRESSORS K103A/B CORRELATED FAILURE DIESEL FUEL OIL PUMPS P-141AIB FAILURE 51 EV-PE-AB)00-Z - 1.28 0.46 0.599 DG A & B SEIS CORREL FUEL OIL PRESSURE REG VALVE E FAILURE 1 52 ,EVRCAB)00(Z _ 1.28 0.46 0.599 DG A & B SEISMICALLY CORRELATED FUEL OIL RELIEF VALVE C FAIL EVS4565CDZ 1.28 0.46 0.599 DIESEL AIR PSV4565C AND D SEISMIC CORRELATION FAILURE

ý39 ETKT105ABZ 0.94 0.46 j 0.44 CSTs T105A/B FAILURE The following excerpt from section 3.1.4.2 of the PNPS IPEEE submittal describes the process of factoring up a HLPLF to get the median capacity. The process used a factor of 1.35 to account for peak-to-valley variability. This can be removed if the seismic hazard analysis accounts for this, which the 2008 USGS and 2010 EPRI seismic hazard analyses do.

Page II of 14

A-Enterg)y ENG REPORT PNPS-RPT-I 1-00001 Revised Calculations for Identified Low Capacity Components Using these conservative seismic capacities in median fragility analysis requires a two step process using the recommendations of Ref 3-10. The first step adjusts for the variability of the definition of the seismic ground motion input. The seismic margins approach uses a ground motion spectral shape that represents an 84% non-exceedance level, whereas seismic fragility analysis uses a median or 50% non-exceedance level. The first conversion adjusts an SMA HCLPF (a HCLPF 84 ) to median equivalent (a HCLPF 50 ) as:

HCLPFeA HCLPF84 HCLPFso= e -- 1.35 where:

3rs O = Response spectrum logarithmic standard deviation (taken at 0.3 for East Coast sites).

The resulting value of the HCLPF 5 0 corresponds to the 5% probability of failure on the 95%

confidence interval. The second conversion moves from the HCLPFso to the median capacity point, or the 50% probability of failure on the 50% confidence interval as:

HCLPFSo HCLPFso C,= eZ.3 - 0.35 Where.

Cm = Median in-structure seismic capacity 03c = Combined uncertainty = 0.46 for this project.

Combining these two steps into a single equation results in the direct relationship between HCLPF8 4 and median capacity as:

C. = HCLPFs4 2-1 x HCLPFu Seismic capacities (Am) are expressed in terms of a Peak Ground Acceleration normalizing the in-structure seismic capacity as:

A,,,=-CR x 0.4g Where:

Am = Median PGA seismic capacity of a specific component IRS = Peak of the in-structure response spectra at or abovefn for the specific component 0.4g = PGA of the ground response spectrum used to generate the IRS All of the median capacities for the components in the table above can be increased by a factor of 1.35. This is done in the table below.

Page 12 of 14

ENG REPORT PNPS-RPT-1 1-00001 tt-Entergy Revised Calculations for Identified Low Capacity Components Origlni aQeaa RkevlSae Number Name MiedlanT.Factor Median __ Component Description 35 EBDDGBLDXZ 0.77 1 1.35 1.04 DIESIEL GENERATOR BUILDING FAILS 37 EBSB2)0O00Z 0.8 1.35 1 SEISMICALLY INDUCED FAILURE OF BUS B2 43 EPM184A)O( 1.05 1.35 1.42 BODG FUEL OIL PUMP P184 FAILURE 42 EFN207A-DZ 1.01 1.35 1.36 VAC207A-D FAILS RBCCW PRESSURE BOUNDARY 4 EFNDWCOOLZ 1.06 -1.35 1.43 -- FAILURE OF VAC205 OR 206 FAMILY OF FAN COOLERS 49 'ECMK103ABZ 1.28 -1.35 1.73 DIESEL STARTING AIR COMPRESSORS K103AJB CORRELATED FAILURE 50 EPM141ABXZ 1.28 1.35 1.73 DIESEL FUEL OIL PUMPS P-141A/B FAILURE 51 *EVPEAB)00(Z 1.28 1.35 1.73 DG A & B SElS CORREL FUELOIL PRESSURE REG VALVE E FAILURE 52 iEVRCAB)OO0Z 1.28 1.35 1.73 DG A & B SEISMICALLY CORRELATED FUEL OIL RELIEF VALVE C FAIL 53 IEVS4565CDZ -_1.28 1.35 1.73 DIESEL AIR PSV4565C AND D SEISMIC CORRELATION FAILURE

+

_39 ETKT105ABZ 10.94 1 1.35 1.27_jCSTs T105A/B FAILURE Page 13 of 14

A% Ente v ENG REPORT PNPS-RPT-1 1-00001 Revised Calculations for Identified Low Capacity Components Summary of Results The following table presents a summary of the revised fragilities for the identified low-capacity components.

-- _-- Component Revised Fragility __

NumberJ Name . Median Beta-C- Comment Component Description 5 1ELOSP )000 . . _- - [LOSS OF OFFSITE POWER_

28 -EN-2-04A- 2.00 0.46-o - Not needed QUAD ROOM COOLER FANs 204A/B FAILURE 29 JEFN204CD)(Z ___2.00 0.46 Nol needed __OIUAD ROOM COOLER FANs_204C/D FAILU-R-E ___

3 EJRE18781'Z . 0.25

. 0.60 ]SEISMICALLY INDUCED CHATTER OF RELAY 187-801A S6 ERE132X9.Z .

ERElI59XZ-1.580-2.22 T_7 I 0.600.60 t Found GERS ISEISMICALLY CORRELATED RELAY CHATTER OF 132-509 AND 609 _9-Replaced- ABB 59N jSEISMCALLY CORRELATED RELAY CHATTER OF 159-509 AND 609(1 AND;

,_3LIEBW209/90M I 00 0.46 ILimited to02.00 IBLOCK WALL 209.0 FAILS _________ ___

35 _ EBDDGBLDXZ 1.04 0.46 -- Bra . - 9DIESEL GENERATOR BUILDING FAILS 45FEBW45/3)CZ 2.00 I 0.46 Limited to 2.00 BLOCK WALL 45.3 FAILS 33 IEBSA8)000 ul rglt(aayiA8BSFIUE _ _

37 EBSB2C000 _1.13 j0.46 __Brs IJSEISMICALLY INDUCED FAILURE OF BUS B2 i*43-- ___1.42

/EPM184A)0(Z 0.46 I . .Brs _IBODG FUEL OIL PUMP P184 FAILURE 13 ERE16059'. I _______ SEISMICALLY CORRELATED RELAY CHATTER OF 160-509 14 ERE18159Z __ _ 1SEISMICALLY INDUCED CHATTER OF RELAY_181-509 15 -ERE 187592-- - - --- JSEISMICALLY I, INDUCED CHATTER OF RELAY 187-509

- 16 " JERE27A5XAZ JSEISMIICALLY INDUCIED-CHATTER OF RELAY 127-A5X_. .. .

-- 32* E-*EA BX .SEISMICALY INDUCED DIESEL GENERATOR A/B CORELATED FAILURE 42 1EFN207A-DZ 1.36 1 0.46 Brs VAC207A-D FAILS RBCCW PRESSURE BOUNDARY

--- ERE15169. . -- - ]SEISMICALLY INDUCED CHATTER OF 151V-69/BC

__24 JERE16069 ___JSEISMICALLY CORRELATED RELAY CHATTER OF 160-609

- 25 ERE1-869!Z _.--........- 'SEISMICALLY INDUCED CHATTER OF-RELAY 181-609 26- ERE18769'_- .SEISMICALLY INDUCE-DCH-ATE-R OF RELAY-187-609 .. .

- 27 -ERE27A6X!- . .SEISMICALLY INDUCED CHATTER OF RELAY 127-A6X 44 EFNDWCOOLZ 1.43 0.46 Brs FAILURE OF VAC205 OR 206 FAMILY OF FAN COOLERS 17 'ERE32801

  • _ _ SEISMICALLY INDUCED CHATTER OF RELAY 132-801A 18 ERE51N81!ZE C INDUCED CHATTER OF RELAY 151N-.01A 19 ERE51NG8!Z -- SEISMICALLY INDUCED-CHATTER OF RELAY 151NG-801A 20 ERE51V81' - SEISMICALLY INDUCED CHATTER OF RELAY 151V-601A 21 ERE59801Z _ _SEISMICALLY INDUCED CHATTER OF RELAY 159-8OlA 31 ERE2352XIZ ___I . !SEISMICALLY CORRELATED RELAY CHATTER OF 23A-K52A AND B 46 EFN201AB)C 1 2.00 0.46 Not needed d HPCI ROOM COOLING FANs VAC201A/B FAILURE 47 EFN202AB)C 2!.00 0.46 Not needed IVACM,-AB FAIL RBCCW PRESSURE BOUNDARY V4i8 EFN203AB)Z 2.00! 0.46 Not needed CRD QUUAD ROO-M COO LING FANS VAC-203NAB-FA LURfE 49 ..EC.MK1ABZ 17-3 046 Bra DIESEL STARTING AIR COMPRESSORS K103A/B CORRELATED FAILURE 50 EPM141ABXZ 1.73 0.46 Bra DIESEL FUEL OIL PUMPS P-141A/B FAILURE 51 EVPEAB)0Z 1.73 j 0.46 Brs DG A & B SEIS CORREL FUEL OIL PRESSURE REG VALVE E FAILURE 52 EVRCAB)0DG 1.73 I 0.46 Bra DGA & B SEISMICALLY CORRELATED FUEL OIL RELIEF VALVE C FAIL 53 EVS4565CDZ 1.73 0.46 Bra DIESEL AIR PSV4565C AND D SEISMIC CORRELAT1ON FAILURE

_22 JERE12769!Z SEISMICALLY CORRELATED CHATTER OF RELAY 127-609 AND 159N-609 30 - ERE114B'Z- .-..- . . " .. SEISMICALLY INDUCED CHATTER OF 420-1846 341ERE-1_____ 81V SEISMICALLY INDUCED CHATTER OF RELAY 186-801A 3 RE X SEISMICALLY INDUCED CHATTER OF 127-509X 39 {ETKT105ABZ 11.27 - 0.46 1 Brs CSTs T105A/B FAILURE 40" EBW210/0XZ _ ___.. Full fragility analysis BLOCK WALL 210.0 FAILS 41 EBW195/23Z 2.00 1 0.46 1. Limited to 2.00 BLOCKWALL 195.23 FAILS 4 [_TK105ABNZ 2.00 0.46 1 Interaction fixed CST 105 A/B FAILS DUE TO N2 TANK INTERACTION 8-ERE480' . - SEISMICALLY INDUCED CHATTER OF RELAY 140-801A 9 ERE468011 2 . _ _ SEISMICALLY INDUCED CHATTER OF RELAY 146-801A 10 __ERE1865! _ ___ .SEISMICALLY INDUCED CHATTER OF RELAY 186-5X 12_ ERE1 5159!Z - SSM CLLY INDUCEDW CATR OF 151V0/A.B.C 1 EISLOCACSZ _____-_.__ ISEISMICALLY INDUCED CORE SPRAY PIPE RUPTURE 2 EISLOCRHRZ ___ SEISMICALLY INDUCED RHR PIPING RUPTURE 11 ERE1-2759!- I---__ SEISMICALLY CORRELATED CHATTER OF RELAY 127-509 AND 159N-509 54 EBW198/1X- - -. Full fragility analysis BLOCK WALL 198.1 FAILS 55 -- EB-iB/q982X _'_* 2___ Full~~ fragility analsis lBLOCK WALL 196.2 FAILS Page 14 of 14

ENG REPORT PNPS-RPT-1 1-00001

~Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency Attachment 5 SCDF Calculations Using Plant-Level Fragility

Is Entey ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Prepared by: Paul Baughman Reviewed by: Dragos Nuta

Background

The plant seismic core damage frequency (SCDF) from the Pilgrim Individual Plant Examination of External Events (IPEEE) Report Seismic Probabilistic Assessment (SPRA) was calculated from the systems model using the SHIP (Seismic Hazard Integration Package) code. The model incorporated seismic fragilities for components into event trees and fault trees. These resulted in sequences where system-induced failures could lead to core damage. The fragilities in the model are in terms of peak ground acceleration (PGA). Therefore, the seismic hazard curve used must also be in terms of PGA.

In the GI-199 SRA the NRC used hazard curves for PGA, 10 Hz, 5 Hz and 1 Hz. The method used for computing the SCDF for each curve is develop a plant-level fragility P(a) and convolve it with the hazard curve H(a), where a is acceleration. The plant-level fragility for PGA is developed from the IPEEE SCDF, median capacity and HCLPF. For use with other hazard curves, the median capacity is modified using m factors. This process is explained in the GI-199 SRA.

The SCDF is calculated as:

SCDF P(a)*L dH(a) da da I where P(a) is the plant-level fragility function and H(a) is the seismic hazard curve.

The above equation can be evaluated numerically. Entergy developed spreadsheets that perform the numerical integration. The failure probability, p(a), at each acceleration level is calculated as follows:

P~)= (DI)ln(a / Am) p(a) __ _

where D[ = Standard normal cumulative distribution function a Seismic acceleration (g)

Am = Plant/component median capacity (g)

Pc = Logarithmic composite standard deviation (uncertainty) of the response and fragility Page 1 of 23

S'Entergy ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency The seismic risk frequency is estimated by convoluting the hazard curve with the component failure probability using the following expression:

Risk = 1? P ai+ai+/-] [f(a),- f(a),]

where p(a) = Component failure probability evaluated at the average seismic acceleration for the interval i to i+l fa)i= Seismic frequency of exceedance for ith acceleration f(a)i+l Seismic frequency of exceedance for (i+l)th acceleration In other words, the overall seismic risk frequency can be estimated by multiplying the plant/component failure probability (which is evaluated at the average acceleration of each interval) by the corresponding frequency of exceedance for that interval and summing the results over the entire range of the seismic hazard curve. The accuracy of the seismic CDF is dependent on the size of the interval used in the convolution, with smaller convolution intervals resulting in more accurate estimates of the seismic core damage frequency (SCDF). The spreadsheets developed by Entergy to estimate the SCDF use a convolution interval of 0.001g, with values in between known data points derived using a log-log interpolation.

Calculations This attachment contains the spreadsheets for the various SCDF calculations.

I. NRC GI-199 SRA Fragility with 2008 USGS Hazard (PGA, 10 Hz, 5 Hz, 1 Hz)

2. Entergy Fragility with 2008 USGS Hazard (PGA, 10 Hz, 5 Hz, 1 Hz)
3. Entergy Fragility- SHIP Adjusted with 2008 USGS Hazard (PGA, 10 Hz, 5 Hz, 1 Hz)
4. NRC GI-199 SRA Fragility with 2010 EPRI Hazard (PGA, 10 Hz, 1 Hz)
5. Entergy Fragility with 2010 EPRI Hazard (PGA, 10 Hz, 1 Hz)
6. Entergy Fragility- SHIP Adjusted with 2010 EPRI Hazard (PGA, 10 Hz, 1 Hz)

Page 2 of 23

PNPS-RPT-1 1-OOO1

  • Entergy ENG REPORT Re-assessment of Pilgrim Seismic Core Damage Frequency NRC GI-199 SRA Frasilitv with 2008 USGS Hazard (PGA)

Total Seismic Core Damage Frequency = I 4.26E-05_

Plant Median Capacity 0.49 Plant HCLPF 0.26 Plant Composite Uncertainty, Pc 0.27 Frequency of Failure Delta Risk Seismic Level (g) Exceedance Probability at g level Annual 0.015 6.76E-03 9.21E-38 5.14E-41 Acceleration Frequency of 0.016 6.21E-03 1.76E-36 7.34E-40 (g) Exceedance 0.017 5.79E-03 2.71E-35 9.93E-39 0.015 6.76E-03 0.018 5.42E-03 3.42E-34 1.11 E-37 0.021 4.63E-03 0.019 5.1OE-03 3.63E-33 1.06E-36 0.029 3.12E-03 0.020 4.81E-03 3.31E-32 5.96E-36 0.040 2.06E-03 0.021 4.63E-03 2.63E-31 8.71 E-35 0.056 1.34E-03 0.022 4.30E-03 1.85E-30 4.12E-34 0.077 8.68E-04 0.023 4.07E-03 1.1 6E-29 2.35E-33 0.106 5.55E-04 0.024 3.87E-03 6.61 E-29 1.22E-32 0.145 3.52E-04 0.025 3.69E-03 3.43E-28 5.80E-32 0.196 2.23E-04 0.026 3.52E-03 1.64E-27 2.54E-31 0.261 1.38E-04 0.027 3.36E-03 7.22E-27 1.04E-30 0.341 8.57E-05 0.028 3.22E-03 2.97E-26 3.06E-30 0.420 5.23E-05 0.029 3.12E-03 1.1 5E-25 1.81 E-29 0.516 3.11E-05 0.030 2.96E-03 4.16E-25 4.92E-29 0.628 1.77E-05 0.031 2.84E-03 1.43E-24 1.57E-28 0.794 9.51 E-06 0.032 2.73E-03 4.65E-24 4.77E-28 0.900 7.08E-06 0.033 2.63E-03 1.44E-23 1.38E-27 1.046 4.65E-06 0.034 2.53E-03 4.28E-23 3.84E-27 1.383 1.96E-06 0.035 2.44E-03 1.22E-22 1.02E-26 1.874 5.99E-07 0.036 2.36E-03 3.33E-22 2.63E-26 0.037 2.28E-03 8.76E-22 6.52E-26 0.038 2.20E-03 2.23E-21 1.56E-25 0.039 2.13E-03 5.48E-21 4.08E-25 0.040 2.06E-03 1.31 E-20 7.34E-25 0.041 2.OOE-03 3.03E-20 1.85E-24 0.042 1.94E-03 6.82E-20 3.95E-24 0.043 1.88E-03 1.50E-19 8.21E-24 0.044 1.83E-03 3.20E-19 1.67E-23 Last EXCEL spreadsheet rows are shown below:

1.872 6.02E-07 1.OOE+00 1.26E-09 1.873 6.01E-07 1.OOE+00 1.75E-09 1.874 5.99E-07 1.OOE+00 5.99E-07 Page 3 of 23

ENG REPORT PNPS-RPT-1 1-00001 Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency NRC GI-199 SRA Fragility with 2008 USGS Hazard (10Hz)

Total Seismic Core Damage Frequency = I 6.88E-05 Plant Median Capacity 0.7595 Plant HCLPF nra Plant Composite Uncertainty, Pc 0.27 Frequency of Failure Delta Risk Seismic Level (g) Exceedance Probability at g level Annual 0.018 1.04E-02 2.25E-43 1.48E-46 Acceleration Frequency of 0.019 9.78E-03 3.28E-42 1.56E-45 (g) Exceedance 0.020 9.31 E-03 4.03E-41 1.74E-44 0.018 1.04E-02 0.021 8.88E-03 4.26E-40 1.67E-43 0.027 7.07E-03 0.022 8.48E-03 3.93E-39 1.41 E-42 0.039 4.70E-03 0.023 8.13E-03 3.20E-38 1.05E-41 0.058 3.03E-03 0.024 7.80E-03 2.33E-37 7.08E-41 0.087 1.88E-03 0.025 7.49E-03 1.54E-36 4.31 E-40 0.129 1.14E-03 0.026 7.21 E-03 9.23E-36 1.35E-39 0.192 6.69E-04 0.027 7.07E-03 5.08E-35 1.94E-38 0.279 3.83E-04 0.028 6.68E-03 2.59E-34 6.25E-38 0.396 2.15E-04 0.029 6.44E-03 1.23E-33 2.76E-37 0.544 1.18E-04 0.030 6.22E-03 5.43E-33 1.14E-36 0.686 7.37E-05 0.031 6.01 E-03 2.26E-32 4.44E-36 0.730 6.26E-05 0.032 5.81 E-03 8.87E-32 1.63E-35 1.045 3.20E-05 0.033 5.63E-03 3.30E-31 5.71 E-35 1.256 2.21 E-05 0.034 5.45E-03 1.17E-30 1.90E-34 1.421 1.54E-05 0.035 5.29E-03 3.93E-30 6.05E-34 1.723 6.74E-06 0.036 5.14E-03 1.27E-29 1.84E-33 2.190 2.52E-06 0.037 4.99E-03 3.92E-29 5.39E-33 2.624 7.OOE-07 0.038 4.85E-03 1.17E-28 1.83E-32 4.000 7.31 E-08 0.039 4.70E-03 3.34E-28 3.41 E-32 0.040 4.59E-03 9.25E-28 1.14E-31 0.041 4.47E-03 2.48E-27 2.89E-31 0.042 4.36E-03 6.43E-27 7.15E-31 0.043 4.24E-03 1.62E-26 1.71 E-30 0.044 4.14E-03 3.97E-26 4.OOE-30 0.045 4.04E-03 9.46E-26 9.12E-30 0.046 3.94E-03 2.20E-25 2.02E-29 0.047 3.85E-03 4.99E-25 4.40E-29 Last EXCEL spreadsheet rows are shown below:

3.998 7.33E-08 1.OOE+00 9.82E-11 3.999 7.32E-08 1.OOE+00 9.80E-11 4.000 7.31 E-08 1.OOE+00 7.31 E-08 Page 4 of 23

ENG REPORT PNPS-RPT-1 1-00001

  • Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency NRC GI-199 SRA Fragility with 2008 USGS Hazard (5Hz)

Total Seismic Core Damage Frequency = I 6.19E-05 i Plant Median Capacity 0.8134 Plant HCLPF n/a Plant Composite Uncertainty, Pc 0.27 Frequency of Failure Delta Risk Seismic Level (g) Exceedance Probability at g level Annual 0.021 1.31E-02 1.42E-41 5.12E-45 Acceleration Frequency of 0.022 1.28E-02 1.36E-40 8.33E-44 (g) Exceedance 0.023 1.21E-02 1.16E-39 6.45E-43 0.021 1.31 E-02 0.024 1.16E-02 8.77E-39 4.48E-42 0.032 8.44E-03 0.025 1.11 E-02 6.OOE-38 2.82E-41 0.047 5.30E-03 0.026 1.06E-02 3.73E-37 1.62E-40 0.070 3.21 E-03 0.027 1.02E-02 2.13E-36 8.53E-40 0.104 1.88E-03 0.028 9.77E-03 1.12E-35 4.16E-39 0.154 1.07E-03 0.029 9.40E-03 5.48E-35 1.89E-38 0.227 5.92E-04 0.030 9.05E-03 2.50E-34 8.07E-38 0.321 3.20E-04 0.031 8.73E-03 1.07E-33 3.17E-37 0.461 1.69E-04 0.032 8.44E-03 4.34E-33 1.34E-36 0.636 8.74E-05 0.033 8.13E-03 1.66E-32 4.70E-36 0.823 5.26E-05 0.034 7.85E-03 6.03E-32 1.60E-35 0.899 4.41 E-05 0.035 7.58E-03 2.09E-31 5.21 E-35 1.259 2.14E-05 0.036 7.33E-03 6.91 E-31 1.62E-34 1.456 1.44E-05 0.037 7.1OE-03 2.19E-30 4.85E-34 1.644 9.77E-06 0.038 6.87E-03 6.68E-30 1.40E-33 1.913 4.03E-06 0.039 6.67E-03 1.96E-29 3.87E-33 2.190 1.44E-06 0.040 6.47E-03 5.56E-29 1.04E-32 2.624 4.16E-07 0.041 6.28E-03 1.52E-28 2.70E-32 3.936 6.69E-08 0.042 6.1OE-03 4.04E-28 6.79E-32 0.043 5.94E-03 1.04E-27 1.66E-31 0.044 5.78E-03 2.60E-27 3.96E-31 0.045 5.62E-03 6.34E-27 9.18E-31 0.046 5.48E-03 1.50E-26 2.72E-30 0.047 5.30E-03 3.48E-26 3.35E-30 0.048 5.20E-03 7.87E-26 1.07E-29 0.049 5.07E-03 1.74E-25 2.26E-29 0.050 4.94E-03 3.77E-25 4.67E-29 Last EXCEL spreadsheet rows are shown below:

3.934 6.70E-08 1.OOE+00 7.68E-11 3.935 6.69E-08 1.OOE+00 7.67E- 11 3.936 6.69E-08 1.00E+00 6.69E-08 Page 5 of 23

ENG REPORT PNPS-RPT-1 1-00001

  • Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency NRC GI-199 SRA Fragility with 2008 USGS Hazard (1Hz)

Total Seismic Core Damage Frequency = I 2.40E-05 Plant Median Capacity 0.245 Plant HCLPF n/a Plant Composite Uncertainty, Pc 0.27 Frequency of Failure Delta Risk Seismic Level (g) Exceedance Probability at g level Annual 0.004 1.16E-02 6.86E-50 1.74E-52 Acceleration Frequency of 0.005 9.1OE-03 3.29E-45 5.64E-48 (g) Exceedance 0.006 7.39E-03 1.71E-41 2.04E-44 0.004 1.16E-02 0.007 6.19E-03 1.92E-38 1.76E-41 0.006 7.39E-03 0.008 5.27E-03 7.09E-36 5.62E-39 0.009 4.48E-03 0.009 4.48E-03 1.14E-33 5.60E-37 0.014 2.57E-03 0.010 3.99E-03 9.48E-32 4.47E-35 0.021 1.40E-03 0.011 3.52E-03 4.70E-30 1.79E-33 0.033 7.24E-04 0.012 3.14E-03 1.52E-28 4.79E-32 0.050 3.58E-04 0.013 2.82E-03 3.47E-27 8.87E-31 0.076 1.71E-04 0.014 2.57E-03 5.88E-26 1.50E-29 0.116 8.09E-05 0.015 2.31E-03 7.76E-25 1.62E-28 0.176 3.81 E-05 0.016 2.1OE-03 8.24E-24 1.48E-27 0.274 1.79E-05 0.017 1.92E-03 7.26E-23 1.12E-26 0.415 8.21E-06 0.018 1.77E-03 5.42E-22 7.32E-26 0.520 5.37E-06 0.019 1.63E-03 3.51 E-21 4.16E-25 0.643 3.55E-06 0.020 1.52E-03 2.OOE-20 2.27E-24 0.964 1.41 E-06 0.021 1.40E-03 1.01E-19 8.71E-24 1.188 8.42E-07 0.022 1.32E-03 4.64E-19 3.93E-23 1.439 5.10E-07 0.023 1.23E-03 1.94E-18 1.47E-22 2.165 1.59E-07 0.024 1.15E-03 7.44E-18 5.1OE-22 3.247 4.28E-08 0.025 1.09E-03 2.65E-17 1.64E-21 4.871 8.57E-09 0.026 1.02E-03 8.80E-17 4.96E-21 0.027 9.68E-04 2.74E-16 1.41E-20 0.028 9.16E-04 8.06E-16 3.79E-20 0.029 8.69E-04 2.25E-15 9.69E-20 0.030 8.26E-04 5.97E-15 2.36E-19 0.031 7.87E-04 1.51E-14 5.53E-19 0.032 7.50E-04 3.67E-14 9.71 E- 19 0.033 7.24E-04 8.58E-14 3.76E-18 Last EXCEL spreadsheet rows are shown below:

4.869 8.58E-09 1.OOE+00 6.99E-12 4.870 8.58E-09 1.OOE+00 5.58E-12 4.871 8.57E-09 1.OOE+00 8.57E-09 Page 6 of 23

ENG REPORT PNPS-RPT-1 1-00001

  • Enter~gy Reassessment of Pilgrim Seismic Core Damage Frequency Entern Fragility with 2008 USGS Hazard (PGA)

Total Seismic Core Damage Frequency = 1 2.78E-05 Plant Median Capacity 0.57 Plant HCLPF 0.33 Plant Composite Uncertainty, Pc 0.23 Frequency of Failure Delta Risk Seismic Level (g) Exceedance Probability at g level Annual 0.015 6.76E-03 1.16E-55 6.46E-59 Acceleration Frequency of 0.016 6.21E-03 8.03E-54 3.34E-57 (g) Exceedance 0.017 5.79E-03 4.06E-52 1.49E-55 0.015 6.76E-03 0.018 5.42E-03 1.56E-50 5.07E-54 0.021 4.63E-03 0.019 5.1OE-03 4.67E-49 1.36E-52 0.029 3.12E-03 0.020 4.81E-03 1.13E-47 2.03E-51 0.040 2.06E-03 0.021 4.63E-03 2.23E-46 7.38E-50 0.056 1.34E-03 0.022 4.30E-03 3.71E-45 8.26E-49 0.077 8.68E-04 0.023 4.07E-03 5.26E-44 1.06E-47 0.106 5.55E-04 0.024 3.87E-03 6.46E-43 1.19E-46 0.145 3.52E-04 0.025 3.69E-03 6.97E-42 1.18E-45 0.196 2.23E-04 0.026 3.52E-03 6.66E-41 1.03E-44 0.261 1.38E-04 0.027 3.36E-03 5.70E-40 8.17E-44 0.341 8.57E-05 0.028 3.22E-03 4.41 E-39 4.54E-43 0.420 5.23E-05 0.029 3.12E-03 3.11E-38 4.93E-42 0.516 3.11E-05 0.030 2.96E-03 2.01 E-37 2.38E-41 0.628 1.77E-05 0.031 2.84E-03 1.20E-36 1.32E-40 0.794 9.51 E-06 0.032 2.73E-03 6.66E-36 6.83E-40 0.900 7.08E-06 0.033 2.63E-03 3.44E-35 3.30E-39 1.046 4.65E-06 0.034 2.53E-03 1.67E-34 1.50E-38 1.383 1.96E-06 0.035 2.44E-03 7.61 E-34 6.40E-38 1.874 5.99E-07 0.036 2.36E-03 3.28E-33 2.59E-37 0.037 2.28E-03 1.34E-32 9.96E-37 0.038 2.20E-03 5.20E-32 3.65E-36 0.039 2.13E-03 1.93E-31 1.43E-35 0.040 2.06E-03 6.82E-31 3.83E-35 0.041 2.OOE-03 2.32E-30 1.42E-34 0.042 1.94E-03 7.56E-30 4.38E-34 0.043 1.88E-03 2.38E-29 1.30E-33 0.044 1.83E-03 7.21 E-29 3.75E-33 Last EXCEL spreadsheet rows are shown below:

1.872 6.02E-07 1.OOE+00 1.26E-09 1.873 6.01 E-07 1.00E+00 1.75E-09 1.874 5.99E-07 1.00E+00 5.99E-07 Page 7 of 23

PNPS-RPT-1 1-00001

  • Entergy ENG REPORT Re-assessment of Pilgrim Seismic Core Damage Frequency Enterev Fragility with 2008 USGS Hazard (10Hz)

Total Seismic Core Damage Frequency = I 4.88E-05 Plant Median Capacity 0.8835 Plant HCLPF n/a Plant Composite Uncertainty, pc 0.23 Frequency of Failure Delta Risk Seismic Level (g) Exceedance Probability at g level Annual 0.018 1.04E-02 1.04E-63 6.84E-67 Acceleration Frequency of 0.019 9.78E-03 4.83E-62 2.30E-65 (g) Exceedance 0.020 9.31E-03 1.76E-60 7.59E-64 0.018 1.04E-02 0.021 8.88E-03 5.17E-59 2.03E-62 0.027 7.07E-03 0.022 8.48E-03 1.25E-57 4.49E-61 0.039 4.70E-03 0.023 8.13E-03 2.54E-56 8.36E-60 0.058 3.03E-03 0.024 7.80E-03 4.40E-55 1.33E-58 0.087 1.88E-03 0.025 7.49E-03 6.59E-54 1.85E-57 0.129 1.14E-03 0.026 7.21E-03 8.66E-53 1.27E-56 0.192 6.69E-04 0.027 7.07E-03 1.01 E-51 3.84E-55 0.279 3.83E-04 0.028 6.68E-03 1.05E-50 2.52E-54 0.396 2.15E-04 0.029 6.44E-03 9.79E-50 2.20E-53 0.544 1.18E-04 0.030 6.22E-03 8.34E-49 1.75E-52 0.686 7.37E-05 0.031 6.01E-03 6.49E-48 1.28E-51 0.730 6.26E-05 0.032 5.81E-03 4.65E-47 8.58E-51 1.045 3.20E-05 0.033 5.63E-03 3.09E-46 5.35E-50 1.256 2.21E-05 0.034 5.45E-03 1.91 E-45 3.11 E-49 1.421 1.54E-05 0.035 5.29E-03 1.10E-44 1.69E-48 1.723 6.74E-06 0.036 5.14E-03 5.96E-44 8.66E-48 2.190 2.52E-06 0.037 4.99E-03 3.04E-43 4.18E-47 2.624 7.OOE-07 0.038 4.85E-03 1.47E-42 2.30E-46 4.000 7.31 E-08 0.039 4.70E-03 6.71 E-42 6.85E-46 0.040 4.59E-03 2.92E-41 3.59E-45 0.041 4.47E-03 1.21 E-40 1.42E-44 0.042 4.36E-03 4.81 E-40 5.35E-44 0.043 4.24E-03 1.83E-39 1.94E-43 0.044 4.14E-03 6.70E-39 6.76E-43 0.045 4.04E-03 2.36E-38 2.27E-42 0.046 3.94E-03 8.OOE-38 7.36E-42 0.047 3.85E-03 2.62E-37 2.31 E-41 Last EXCEL spreadsheet rows are shown below:

3.998 7.33E-08 1.OOE+00 9.82E-11 3.999 7.32E-08 1.OOE+00 9.80E-11 4.000 7.31 E-08 1.OOE+00 7.31 E-08 Page 8 of 23

ENG REPORT PNPS-RPT-1 1-00001

  • Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency Enterev Fragilitv with 2008 USGS Hazard (5Hz) X Total Seismic Core Damage Frequency = I 4.36E-05 Plant Median Capacity 0.9462 Plant HCLPF n/a Plant Composite Uncertainty, Pc 0.23 Frequency of Failure Delta Risk Seismic Level (g) Exceedance Probability at g level Annual 0.021 1.31E-02 3.93E-61 1.42E-64 Acceleration Frequency of 0.022 1.28E-02 1.01 E-59 6.16E-63 (g) Exceedance 0.023 1.21E-02 2.17E-58 1.21E-61 0.021 1.31 E-02 0.024 1.16E-02 3.96E-57 2.02E-60 0.032 8.44E-03 0.025 1.11E-02 6.25E-56 2.94E-59 0.047 5.30E-03 0.026 1.06E-02 8.62E-55 3.74E-58 0.070 3.21 E-03 0.027 1.02E-02 1.05E-53 4.21 E-57 0.104 1.88E-03 0.028 9.77E-03 1.14E-52 4.25E-56 0.154 1.07E-03 0.029 9.40E-03 1.12E-51 3.87E-55 0.227 5.92E-04 0.030 9.05E-03 9.96E-51 3.21E-54 0.321 3.20E-04 0.031 8.73E-03 8.09E-50 2.38E-53 0.461 1.69E-04 0.032 8.44E-03 6.04E-49 1.87E-52 0.636 8.74E-05 0.033 8.13E-03 4.17E-48 1.1 8E-51 0.823 5.26E-05 0.034 7.85E-03 2.67E-47 7.09E-51 0.899 4.41 E-05 0.035 7.58E-03 1.60E-46 3.99E-50 1.259 2.14E-05 0.036 7.33E-03 8.97E-46 2.11 E-49 1.456 1.44E-05 0.037 7.1OE-03 4.74E-45 1.05E-48 1.644 9.77E-06 0.038 6.87E-03 2.37E-44 4.94E-48 1.913 4.03E-06 0.039 6.67E-03 1.12E-43 2.21E-47 2.190 1.44E-06 0.040 6.47E-03 5.03E-43 9.40E-47 2.624 4.16E-07 0.041 6.28E-03 2.16E-42 3.82E-46 3.936 6.69E-08 0.042 6.1 OE-03 8.82E-42 1.48E-45 0.043 5.94E-03 3.46E-41 5.53E-45 0.044 5.78E-03 1.30E-40 1.98E-44 0.045 5.62E-03 4.72E-40 6.83E-44 0.046 5.48E-03 1.65E-39 2.98E-43 0.047 5.30E-03 5.55E-39 5.34E-43 0.048 5.20E-03 1.81 E-38 2.46E-42 0.049 5.07E-03 5.70E-38 7.40E-42 0.050 4.94E-03 1.74E-37 2.16E-41 Last EXCEL spreadsheet rows are shown below:

3.934 6.70E-08 1.00E+00 7.68E-11 3.935 6.69E-08 1.OOE+00 7.67E-11 3.936 6.69E-08 1.OOE+00 I 6.69E-08 Page 9 of 23

ENG REPORT PNPS-RPT-11-00001

  • Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency Enterev Fragility with 2008 USGS Hazard (1Hz) P Total Seismic Core Damage Frequency = 1.79E-05 Plant Median Capacity 0.285 Plant HCLPF - n/a Plant Composite Uncertainty, P3c 0.23 Frequency of Failure Delta Risk Seismic Level (g) Exceedance Probability at g level Annual 0.004 1.16E-02 5.03E-73 1.27E-75 Acceleration Frequency of 0.005 9.10E-03 2.47E-66 4.22E-69 (g) Exceedance 0.006 7.39E-03 5.13E-61 6.12E-64 0.004 1.16E-02 0.007 6.19E-03 1.21E-56 1.12E-59 0.006 7.39E-03 0.008 5.27E-03 5.93E-53 4.69E-56 0.009 4.48E-03 0.009 4.48E-03 8.78E-50 4.32E-53 0.014 2.57E-03 0.010 3.99E-03 5.13E-47 2.42E-50 0.021 1.40E-03 0.011 3.52E-03 1.42E-44 5.43E-48 0.033 7.24E-04 0.012 3.14E-03 2.16E-42 6.78E-46 0.050 3.58E-04 0.013 2.82E-03 1.97E-40 5.05E-44 0.076 1.71 E-04 0.014 2.57E-03 1.19E-38 3.02E-42 0.116 8.09E-05 0.015 2.31E-03 4.97E-37 1.04E-40 0.176 3.81 E-05 0.016 2.1 OE-03 1.53E-35 2.73E-39 0.274 1.79E-05 0.017 1.92E-03 3.59E-34 5.55E-38 0.415 8.21E-06 0.018 1.77E-03 6.66E-33 8.99E-37 0.520 5.37E-06 0.019 1.63E-03 1.01E-31 1.19E-35 0.643 3.55E-06 0.020 1.52E-03 1.26E-30 1.43E-34 0.964 1.41 E-06 0.021 1.40E-03 1.35E-29 1.16E-33 1.188 8.42E-07 0.022 1.32E-03 1.24E-28 1.05E-32 1.439 5.1 OE-07 0.023 1.23E-03 9.98E-28 7.59E-32 2.165 1.59E-07 0.024 1.15E-03 7.13E-27 4.88E-31 3.247 4.28E-08 0.025 1.09E-03 4.56E-26 2.83E-30 4.871 8.57E-09 0.026 1.02E-03 2.64E-25 1.49E-29 0.027 9.68E-04 1.40E-24 7.18E-29 0.028 9.16E-04 6.80E-24 3.19E-28 0.029 8.69E-04 3.06E-23 1.32E-27 0.030 8.26E-04 1.28E-22 5.09E-27 0.031 7.87E-04 5.04E-22 1.84E-26 0.032 7.50E-04 1.86E-21 4.92E-26 0.033 7.24E-04 6.49E-21 2.84E-25 Last EXCEL spreadsheet rows are shown below:

4.869 8.58E-09 1.OOE+00 6.99E-12 4.870 8.58E-09 1.OOE+00 5.58E-12 4.871 8.57E-09 I 1.OOE+00 8.57E-09 Page 10 of 23

ENG REPORT PNPS-RPT-11-00001

  • Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency Enteri Fragility - SHIP Adiusted with 2008 USGS Hazard (PGA)f Total Seismic Core Damage Frequency = I 2.14E-05 Plant Median Capacity 0.63 Plant HCLPF 0.37 Plant Composite Uncertainty, Pc 0.23 Frequency of Failure Delta Risk Seismic Level (g) Exceedance Probability at g level Annual 0.015 6.76E-03 1.12E-58 6.24E-62 Acceleration Frequency of 0.016 6.21E-03 8.73E-57 3.63E-60 (g) Exceedance 0.017 5.79E-03 4.94E-55 1.81E-58 0.015 6.76E-03 0.018 5.42E-03 2.10E-53 6.84E-57 0.021 4.63E-03 0.019 5.1 OE-03 6.95E-52 2.02E-55 0.029 3.12E-03 0.020 4.81E-03 1.84E-50 3.31 E-54 0.040 2.06E-03 0.021 4.63E-03 3.99E-49 1.32E-52 0.056 1.34E-03 0.022 4.30E-03 7.23E-48 1.61E-51 0.077 8.68E-04 0.023 4.07E-03 1.11 E-46 2.25E-50 0.106 5.55E-04 0.024 3.87E-03 1.48E-45 2.73E-49 0.145 3.52E-04 0.025 3.69E-03 1.72E-44 2.91 E-48 0.196 2.23E-04 0.026 3.52E-03 1.77E-43 2.75E-47 0.261 1.38E-04 0.027 3.36E-03 1.62E-42 2.32E-46 0.341 8.57E-05 0.028 3.22E-03 1.34E-41 1.38E-45 0.420 5.23E-05 0.029 3.12E-03 1.01E-40 1.60E-44 0.516 3.11E-05 0.030 2.96E-03 6.96E-40 8.24E-44 0.628 1.77E-05 0.031 2.84E-03 4.41 E-39 4.86E-43 0.794 9.51E-06 0.032 2.73E-03 2.59E-38 2.66E-42 0.900 7.08E-06 0.033 2.63E-03 1.42E-37 1.36E-41 1.046 4.65E-06 0.034 2.53E-03 7.27E-37 6.52E-41 1.383 1.96E-06 0.035 2.44E-03 3.50E-36 2.94E-40 1.874 5.99E-07 0.036 2.36E-03 1.59E-35 1.26E-39 0.037 2.28E-03 6.82E-35 5.08E-39 0.038 2.20E-03 2.78E-34 1.95E-38 0.039 2.13E-03 1.08E-33 8.05E-38 0.040 2.06E-03 4.02E-33 2.26E-37 0.041 2.OOE-03 1.43E-32 8.73E-37 0.042 1.94E-03 4.88E-32 2.82E-36 0.043 1.88E-03 1.60E-31 8.79E-36 0.044 1.83E-03 5.07E-31 2.64E-35 Last EXCEL spreadsheet rows are shown below:

1.872 6.02E-07 1.OOE+00 1.26E-09 1.873 6.01E-07 1.OOE+00 1.75E-09 1.874 5.99E-07 1.00E+00 5.99E-07 Page 1I of 23

ENG REPORT PNPS-RPT-11-O0001

  • Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency Entergy Fragility - SHIP Adjusted with 2008 USGS Hazard (10Hz)

I Total Seismic Core Damage Frequency = I 3.98E-05 I Plant Median Capacity 0.9765 Plant HCLPF n/a Plant Composite Uncertainty, P3c 0.23 Frequency of Failure Delta Risk Seismic Level (g) Exceedance Probability at g level Annual 0.018 1.04E-02 6.17E-67 4.04E-70 Acceleration Frequency of 0.019 9.78E-03 3.15E-65 1.50E-68 (g) Exceedance 0.020 9.31E-03 1.26E-63 5.44E-67 0.018 1.04E-02 0.021 8.88E-03 4.05E-62 1.59E-65 0.027 7.07E-03 0.022 8.48E-03 1.07E-60 3.83E-64 0.039 4.70E-03 0.023 8.13E-03 2.35E-59 7.75E-63 0.058 3.03E-03 0.024 7.80E-03 4.41 E-58 1.34E-61 0.087 1.88E-03 0.025 7.49E-03 7.13E-57 2.OOE-60 0.129 1.14E-03 0.026 7.21E-03 1.01E-55 1.48E-59 0.192 6.69E-04 0.027 7.07E-03 1.25E-54 4.78E-58 0.279 3.83E-04 0.028 6.68E-03 1.39E-53 3.36E-57 0.396 2.15E-04 0.029 6.44E-03 1.39E-52 3.13E-56 0.544 1.18E-04 0.030 6.22E-03 1.26E-51 2.65E-55 0.686 7.37E-05 0.031 6.01E-03 1.05E-50 2.05E-54 0.730 6.26E-05 0.032 5.81 E-03 7.95E-50 1.47E-53 1.045 3.20E-05 0.033 5.63E-03 5.58E-49 9.67E-53 1.256 2.21E-05 0.034 5.45E-03 3.64E-48 5.94E-52 1.421 1.54E-05 0.035 5.29E-03 2.22E-47 3.41 E-51 1.723 6.74E-06 0.036 5.14E-03 1.27E-46 1.84E-50 2.190 2.52E-06 0.037 4.99E-03 6.80E-46 9.35E-50 2.624 7.OOE-07 0.038 4.85E-03 3.45E-45 5.39E-49 4.000 7.31 E-08 0.039 4.70E-03 1.65E-44 1.69E-48 0.040 4.59E-03 7.55E-44 9.29E-48 0.041 4.47E-03 3.28E-43 3.83E-47 0.042 4.36E-03 1.36E-42 1.51 E-46 0.043 4.24E-03 5.42E-42 5.74E-46 0.044 4.14E-03 2.07E-41 2.09E-45 0.045 4.04E-03 7.58E-41 7.31 E-45 0.046 3.94E-03 2.68E-40 2.47E-44 0.047 3.85E-03 9.15E-40 8.05E-44 Last EXCEL spreadsheet rows are shown below:

3.998 7.33E-08 1.00E+00 9.82E-11 3.999 7.32E-08 1.OOE+00 9.80E-1 1 4.000 7.31E-08 1.00E+00 7.31E-08 Page 12 of 23

ENG REPORT PNPS-RPT-1 1-00001

  • Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency Entergv Fragilitv - SHIP Adjusted with 2008 USGS Hazard (5Hz)

I Total Seismic Core Damage Frequency = I 3.53E-05 I Plant Median Capacity 1.0458 Plant HCLPF n/a Plant Composite Uncertainty, Pc 0.23 Frequency of Failure Delta Risk Seismic Level (g) Exceedance Probability at g level Annual 0.021 1.31E-02 2.71E-64 9.80E-68 Acceleration Frequency of 0.022 1.28E-02 7.57E-63 4.63E-66 (g) Exceedance 0.023 1.21 E-02 1.76E-61 9.84E-65 0.021 1.31 E-02 0.024 1.16E-02 3.49E-60 1.78E-63 0.032 8.44E-03 0.025 1.11E-02 5.94E-59 2.79E-62 0.047 5.30E-03 0.026 1.06E-02 8.81 E-58 3.82E-61 0.070 3.21E-03 0.027 1.02E-02 1.15E-56 4.61E-60 0.104 1.88E-03 0.028 9.77E-03 1.34E-55 4.98E-59 0.154 1.07E-03 0.029 9.40E-03 1.40E-54 4.84E-58 0.227 5.92E-04 0.030 9.05E-03 1.33E-53 4.27E-57 0.321 3.20E-04 0.031 8.73E-03 1.14E-52 3.37E-56 0.461 1.69E-04 0.032 8.44E-03 9.06E-52 2.80E-55 0.636 8.74E-05 0.033 8.13E-03 6.62E-51 1.87E-54 0.823 5.26E-05 0.034 7.85E-03 4.49E-50 1.19E-53 0.899 4.41 E-05 0.035 7.58E-03 2.83E-49 7.07E-53 1.259 2.14E-05 0.036 7.33E-03 1.68E-48 3.93E-52 1.456 1.44E-05 0.037 7.1OE-03 9.32E-48 2.06E-51 1.644 9.77E-06 0.038 6.87E-03 4.89E-47 1.02E-50 1.913 4.03E-06 0.039 6.67E-03 2.42E-46 4.79E-50 2.190 1.44E-06 0.040 6.47E-03 1.14E-45 2.14E-49 2.624 4.16E-07 0.041 6.28E-03 5.13E-45 9.08E-49 3.936 6.69E-08 0.042 6.10E-03 2.19E-44 3.69E-48 0.043 5.94E-03 8.99E-44 1.44E-47 0.044 5.78E-03 3.53E-43 5.37E-47 0.045 5.62E-03 1.33E-42 1.93E-46 0.046 5.48E-03 4.85E-42 8.78E-46 0.047 5.30E-03 1.70E-41 1.64E-45 0.048 5.20E-03 5.76E-41 7.83E-45 0.049 5.07E-03 1.89E-40 2.45E-44 0.050 4.94E-03 6.OOE-40 7.44E-44 Last EXCEL spreadsheet rows are shown below:

3.934 6.70E-08 1.OOE+00 7.68E- 11 3.935 6.69E-08 1.OOE+00 7.67E-11 3.936 6.69E-08 1.OOE+00 6.69E-08 Page 13 of 23

ENG REPORT PNPS-RPT-1 1-00001

  • Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency EnterLy Fragilitv - SHIP Adjusted with 2008 USGS Hazard (1Hz)

Total Seismic Core Damage Frequency = I 1.49E-05 Plant Median Capacity 0.315 Plant HCLPF n/a Plant Composite Uncertainty, Pc 0.23 Frequency of Failure Delta Risk Seismic Level (g) Exceedance Probability at g level Annual 0.004 1.16E-02 1.74E-76 4.42E-79 Acceleration Frequency of 0.005 9.1OE-03 1.25E-69 2.14E-72 (g) Exceedance 0.006 7.39E-03 3.56E-64 4.25E-67 0.004 1.16E-02 0.007 6.19E-03 1.1OE-59 1.02E-62 0.006 7.39E-03 0.008 5.27E-03 6.82E-56 5.40E-59 0.009 4.48E-03 0.009 4.48E-03 1.25E-52 6.13E-56 0.014 2.57E-03 0.010 3.99E-03 8.78E-50 4.14E-53 0.021 1.40E-03 0.011 3.52E-03 2.89E-47 1.1OE-50 0.033 7.24E-04 0.012 3.14E-03 5.13E-45 1.61 E-48 0.050 3.58E-04 0.013 2.82E-03 5.43E-43 1.39E-46 0.076 1.71E-04 0.014 2.57E-03 3.73E-41 9.48E-45 0.116 8.09E-05 0.015 2.31E-03 1.77E-39 3.70E-43 0.176 3.81E-05 0.016 2.1OE-03 6.12E-38 1.1OE-41 0.274 1.79E-05 0.017 1.92E-03 1.61 E-36 2.49E-40 0.415 8.21E-06 0.018 1.77E-03 3.31 E-35 4.47E-39 0.520 5.37E-06 0.019 1.63E-03 5.52E-34 6.54E-38 0.643 3.55E-06 0.020 1.52E-03 7.62E-33 8.65E-37 0.964 1.41E-06 0.021 1.40E-03 8.88E-32 7.64E-36 1.188 8.42E-07 0.022 1.32E-03 8.89E-31 7.54E-35 1.439 5.10E-07 0.023 1.23E-03 7.77E-30 5.91 E-34 2.165 1.59E-07 0.024 1.15E-03 6.OOE-29 4.12E-33 3.247 4.28E-08 0.025 1.09E-03 4.14E-28 2.57E-32 4.871 8.57E-09 0.026 1.02E-03 2.58E-27 1.45E-31 0.027 9.68E-04 1.46E-26 7.52E-31 0.028 9.16E-04 7.61E-26 3.57E-30 0.029 8.69E-04 3.66E-25 1.58E-29 0.030 8.26E-04 1.63E-24 6.47E-29 0.031 7.87E-04 6.80E-24 2.49E-28 0.032 7.50E-04 2.66E-23 7.04E-28 0.033 7.24E-04 9.82E-23 4.30E-27 Last EXCEL spreadsheet rows are shown below:

4.869 8.58E-09 1.OOE+00 6.99E-12 4.870 8.58E-09 1.OOE+00 5.58E-12 4.871 8.57E-09 1.OOE+00 8.57E-09 Page 14 of 23

ENG REPORT PNPS-RPT-1 1-00001 Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency NRC GI-199 SRA Fragility with 2010 EPRI Hazard (PGA)

Total Seismic Core eF = 3.E06 Plant Median Capacity 0.49 Plant HCLPF 0.261 Plant Composite Uncertainty, Pc 0.27 Frequency of Failure Delta Risk Seismic Level (g) Exceedance Probability at g level Annual 0.001 1.15E-04 1.11E-108 0.OOE+00 Acceleration Frequency of 0.0015 1.15E-04 5.06E-97 0.OOE+00 (g) Exceedance 0.002 1.15E-04 2.12E-85 0.OOE+00 0.001 1.15E-04 0.003 1.1 5E-04 3.96E-75 1.61 E-94 0.0015 1.15E-04 0.004 1.15E-04 6.77E-68 -2.75E-87 0.002 1.15E-04 0.005 1.15E-04 2.17E-62 8.83E-82 0.003 1.15E-04 0.006 1.15E-04 5.47E-58 -2.22E-77 0.005 1.15E-04 0.007 1.1 5E-04 2.38E-54 9.68E-74 0.007 1.15E-04 0.008 1.15E-04 2.88E-51 0.OOE+00 0.01 1.15E-04 0.009 1.15E-04 1.32E-48 -5.37E-68 0.015 1.15E-04 0.010 1.1 5E-04 2.84E-46 1.1 5E-65 0.02 1.15E-04 0.011 1.15E-04 3.33E-44 0.OOE+00 0.03 1.15E-04 0.012 1.15E-04 2.37E-42 0.OOE+00 0.05 1.15E-04 0.013 1.15E-04 1.12E-40 0.OOE+00 0.07 1.11 E-04 0.014 1.1 5E-04 3.72E-39 -1.51E-58 0.1 1.02E-04 0.015 1.15E-04 9.21E-38 3.74E-57 0.15 8.59E-05 0.016 1.15E-04 1.76E-36 0.OOE+00 0.2 7.20E-05 0.017 1.15E-04 2.71E-35 0.OOE+00 0.3 5.22E-05 0.018 1.15E-04 3.42E-34 0.OOE+00 0.5 2.99E-05 0.019 1.15E-04 3.63E-33 -1.48E-52 0.7 1.83E-05 0.020 1.1 5E-04 3.31 E-32 1.35E-51 1 9.54E-06 0.021 1.15E-04 2.63E-31 0.OOE+00 1.5 3.98E-06 0.022 1.15E-04 1.85E-30 0.OOE+00 2 1.95E-06 0.023 1.15E-04 1.16E-29 0.OOE+00 3 6.19E-07 0.024 1.15E-04 6.61E-29 0.OOE+00 5 1.1OE-07 0.025 1.15E-04 3.43E-28 0.OOE+00 7 2.92E-08 0.026 1.15E-04 1.64E-27 0.OOE+00 10 5.97E-09 0.027 1.15E-04 7.22E-27 0.OOE+00 0.028 1.15E-04 2.97E-26 0.OOE+00 0.029 1.15E-04 1.15E-25 -4.66E-45 Last EXCEL spreadsheet rows are shown below:

9.998 5.98E-09 1.OOE+00 2.66E-12 9.999 5.97E-09 1.OOE+00 2.66E-12 10.000 5.97E-09 I 1.OOE+00 5.97E-09 Page 15 of 23

PNPS-RPT-1 1-00001

  • Entergy ENG REPORT Re-assessment of Pilgrim Seismic Core Damage Frequency NRC GI-199 SRA Fragility with 2010 EPRI Hazard (10Hz)

Total Seismic Core uen = 2.74E-0 Plant Median Capacity 0.7595 Plant HCLPF n/a Plant Composite Uncertainty, 03c 0.27 Frequency of Failure Delta Risk Seismic Level (g) Exceedance Probability at g level Annual 0.001 1.1 5E-04 7.15E-125 0.OOE+00 Acceleration Frequency of 0.0015 1.15E-04 2.44E-112 0.OOE+00 (g) Exceedance 0.002 1.15E-04 8.70E-100 0.OOE+00 0.001 1.15E-04 0.003 1.15E-04 1.22E-88 4.97E-108 0.0015 1.15E-04 0.004 1.15E-04 9.42E-81 -3.83E-100 0.002 1.15E-04 0.005 1.15E-04 1.01E-74 4.09E-94 0.003 1.1 5E-04 0.006 1.15E-04 6.90E-70 -2.80E-89 0.005 1.15E-04 0.007 1.15E-04 7.07E-66 2.88E-85 0.007 1.1 5E-04 0.008 1.15E-04 1.81E-62 0.OOE+00 0.01 1.15E-04 0.009 1.15E-04 1.62E-59 -6.57E-79 0.015 1.15E-04 0.010 1.15E-04 6.33E-57 2.57E-76 0.02 1.15E-04 0.011 1.1 5E-04 1.28E-54 0.OOE+00 0.03 1.15E-04 0.012 1.1 5E-04 1.50E-52 0.OOE+00 0.05 1.15E-04 0.013 1.15E-04 1.12E-50 0.OOE+00 0.07 1.13E-04 0.014 1.15E-04 5.72E-49 -2.32E-68 0.1 1.09E-04 0.015 1.15E-04 2.11E-47 8.57E-67 0.15 9.93E-05 0.016 1.15E-04 5.87E-46 0.OOE+00 0.2 8.84E-05 0.017 1.1 5E-04 1.28E-44 0.OOE+00 0.3 6.94E-05 0.018 1.15E-04 2.25E-43 0.OOE+00 0.5 4.43E-05 0.019 1.1 5E-04 3.28E-42 -1.33E-61 0.7 2.98E-05 0.020 1.15E-04 4.03E-41 1.64E-60 1 1.76E-05 0.021 1.15E-04 4.26E-40 0.OOE+00 1.5 8.47E-06 0.022 1.15E-04 3.93E-39 0.OOE+00 2 4.65E-06 0.023 1.1 5E-04 3.20E-38 0.OOE+00 3 1.80E-06 0.024 1.15E-04 2.33E-37 0.OOE+00 5 4.59E-07 0.025 1.15E-04 1.54E-36 0.OOE+00 7 1.68E-07 0.026 1.15E-04 9.23E-36 0.OOE+00 10 5.28E-08 0.027 1.15E-04 5.08E-35 0.OOE+00 0.028 1.15E-04 2.59E-34 0.OOE+00 0.029 1.1 5E-04 1.23E-33 -4.99E-53 Last EXCEL spreadsheet rows are shown below:

9.998 5.28E-08 1.OOE+00 1.71 E-1 1 9.999 5.28E-08 1.OOE+00 1.71 E-11 10.000 5.28E-08 1.OOE+00 5.28E-08 Page 16 of 23

PNPS-RPT-1 1-00001

  • Entergy ENG REPORT Re-assessment of Pilgrim Seismic Core Damage Frequency NRC GI-199 SRA Fragility with 2010 EPRI Hazard (1Hz)

Total Seismic Core Damae F = 1.87E Plant Median Capacity 0.245 Plant HCLPF n/a Plant Composite Uncertainty, 13c 0.27 Frequency of Failure Delta Risk Seismic Level (g) Exceedance Probability at g level Annual 0.001 1.15E-04 2.12E-85 0.OOE+00 Acceleration Frequency of 0.0015 1.15E-04 3.96E-75 0.OOE+00 (g) Exceedance 0.002 1.15E-04 5.64E-65 5.64E-71 0.001 1.15E-04 0.003 1.14E-04 4.34E-56 7.38E-62 0.0015 1.15E-04 0.004 1.12E-04 6.86E-50 8.93E-56 0.002 1.15E-04 0.005 1.11 E-04 3.29E-45 9.01 E-51 0.003 1.14E-04 0.006 1.08E-04 1.71 E-41 3.86E-47 0.005 1.11E-04 0.007 1.06E-04 1.92E-38 6.63E-44 0.007 1.06E-04 0.008 1.03E-04 7.09E-36 2.10E-41 0.01 9.70E-05 0.009 9.96E-05 1.14E-33 2.93E-39 0.015 8.23E-05 0.010 9.70E-05 9.48E-32 3.49E-37 0.02 6.95E-05 0.011 9.33E-05 4.70E-30 1.52E-35 0.03 5.01 E-05 0.012 9.01E-05 1.52E-28 4.38E-34 0.05 2.81 E-05 0.013 8.72E-05 3.47E-27 8.95E-33 0.07 1.74E-05 0.014 8.46E-05 5.88E-26 1.37E-31 0.1 9.61 E-06 0.015 8.23E-05 7.76E-25 2.38E-30 0.15 4.49E-06 0.016 7.92E-05 8.24E-24 2.29E-29 0.2 2.49E-06 0.017 7.65E-05 7.26E-23 1.83E-28 0.3 1.02E-06 0.018 7.39E-05 5.42E-22 1.25E-27 0.5 2.99E-07 0.019 7.16E-05 3.51E-21 7.46E-27 0.7 1.24E-07 0.020 6.95E-05 2.OOE-20 5.36E-26 1 4.52E-08 0.021 6.68E-05 1.01E-19 2.49E-25 1.5 1.29E-08 0.022 6.44E-05 4.64E-19 1.05E-24 2 4.90E-09 0.023 6.21E-05 1.94E-18 4.06E-24 3 1.12E-09 0.024 6.OOE-05 7.44E-18 1.45E-23 5 1.41E-10 0.025 5.80E-05 2.65E-17 4.79E-23 0.026 5.62E-05 8.80E-17 1.48E-22 0.027 5.45E-05 2.74E-16 4.33E-22 0.028 5.30E-05 8.06E-16 1.19E-21 0.029 5.15E-05 2.25E-15 3.13E-21 Last EXCEL spreadsheet rows are shown below:

4.998 1.41E-10 1.OOE+00 1.15E-13 4.999 1.41E-10 1.OOE+00 1.14E-13 5.000 1.41E-10 1.OOE+00 1.41E-10 Page 17 of 23

PNPS-RPT-1 1-00001

  • Entergy ENG REPORT Re-assessment of Pilgrim Seismic Core Damage Frequency Entergy Fragility with 2010 EPRI Hazard (PGA)

Tota1 Seismic Core Damg F uen = 2.54E-06 Plant Median Capacity 0.57 Plant HCLPF 0.334 Plant Composite Uncertainty, 03c 0.23 Frequency of Failure Delta Risk Seismic Level (g) Exceedance Probability at g level Annual 0.001 1.15E-04 2.02E-156 0.OOE+00 Acceleration Frequency of 0.0015 1.15E-04 5.98E-140 0.OOE+00 (g) Exceedance 0.002 1.15E-04 1.68E-123 0.OOE+00 0.001 1.15E-04 0.003 1. 15E-04 6.10E-109 2.48E-128 0.0015 1.15E-04 0.004 1.15E-04 1.14E-98 -4.62E-118 0.002 1.15E-04 0.005 1.15E-04 7.68E-91 3.12E-110 0.003 1.15E-04 0.006 1.15E-04 1.42E-84 -5.76E-104 0.005 1.15E-04 0.007 1.15E-04 2.17E-79 8.84E-99 0.007 1.15E-04 0.008 1.15E-04 5.44E-75 0.OOE+00 0.01 1.15E-04 0.009 1.15E-04 3.44E-71 -1.40E-90 0.015 1.15E-04 0.010 1.15E-04 7.42E-68 3.02E-87 0.02 1.15E-04 0.011 1.15E-04 6.75E-65 0.OOE+00 0.03 1.15E-04 0.012 1.15E-04 3.03E-62 0.OOE+00 0.05 1.15E-04 0.013 1.15E-04 7.59E-60 0.OOE+00 0.07 1.11E-04 0.014 1.1 5E-04 1.16E-57 -4.70E-77 0.1 1.02E-04 0.015 1.15E-04 1.16E-55 4.70E-75 0.15 8.59E-05 0.016 1.15E-04 8.03E-54 0.OOE+00 0.2 7.20E-05 0.017 1.15E-04 4.06E-52 0.OOE+00 0.3 5.22E-05 0.018 1.15E-04 1.56E-50 0.OOE+00 0.5 2.99E-05 0.019 1.1 5E-04 4.67E-49 -1.90E-68 0.7 1.83E-05 0.020 1.15E-04 1.13E-47 4.57E-67 1 9.54E-06 0.021 1.15E-04 2.23E-46 0.OOE+00 1.5 3.98E-06 0.022 1.15E-04 3.71E-45 0.OOE+00 2 1.95E-06 0.023 1.15E-04 5.26E-44 0.OOE+00 3 6.19E-07 0.024 1.1 5E-04 6.46E-43 0.OOE+00 5 1.1OE-07 0.025 1.15E-04 6.97E-42 0.OOE+00 7 2.92E-08 0.026 1.1 5E-04 6.66E-41 0.OOE+00 10 5.97E-09 0.027 1.15E-04 5.70E-40 0.OOE+00 0.028 1.15E-04 4.41E-39 0.OOE+00 0.029 1.1 5E-04 3.11 E-38 -1.27E-57 Last EXCEL spreadsheet rows are shown below:

9.998 5.98E-09 1.OOE+00 2.66E-12 9.999 5.97E-09 1.OOE+00 2.66E-12 10.000 5.97E-09 1.00E+00 5.97E-09 Page 18 of 23

PNPS-RPT-1 1-00001

  • Entergy ENG REPORT Re-assessment of Pilgrim Seismic Core Damage Frequency Entergy Fragility with 2010 EPRI Hazard (10Hz)

TotalSeimicCore Damg Frqec = I 2.20E-06 Plant Median Capacity 0.8835 Plant HCLPF n/a Plant Composite Uncertainty, P3c 0.23 Frequency of Failure Delta Risk Seismic Level (g) Exceedance Probability at g level Annual 0.001 1.15E-04 2.87E-179 0.OOE+00 Acceleration Frequency of 0.0015 1.15E-04 1.38E-161 0.OOE+00 (g) Exceedance 0.002 1.15E-04 7.38E-144 0.OOE+00 0.001 1.15E-04 0.003 1.15E-04 4.34E-128 1.76E-147 0.0015 1.15E-04 0.004 1.1 5E-04 6.46E-1 17 -2.63E-1 36 0.002 1.15E-04 0.005 1.15E-04 2.29E-108 9.31E-128 0.003 1.15E-04 0.006 1.1 5E-04 1.68E-101 -6.84E-1 21 0.005 1.15E-04 0.007 1.15E-04 8.42E-96 3.42E-115 0.007 1.15E-04 0.008 1.15E-04 5.93E-91 0.OOE+00 0.01 1.15E-04 0.009 1.15E-04 9.40E-87 -3.82E-106 0.015 1.15E-04 0.010 1.1 5E-04 4.63E-83 1.88E-102 0.02 1.15E-04 0.011 1.15E*04 8.94E-80 0.OOE+00 0.03 1.15E-04 0.012 1.15E-04 8.OOE-77 0.OOE+00 0.05 1.15E-04 0.013 1.15E-04 3.78E-74 0.OOE+00 0.07 1.13E-04 0.014 1.15E-04 1.04E-71 -4.22E-91 0.1 1.09E-04 0.015 1.15E-04 1.80E-69 7.32E-89 0.15 9.93E-05 0.016 1.15E-04 2.1OE-67 0.OOE+00 0.2 8.84E-05 0.017 1.15E-04 1.72E-65 0.OOE+00 0.3 6.94E-05 0.018 1.15E-04 1.04E-63 0.OOE+00 0.5 4.43E-05 0.019 1.1 5E-04 4.83E-62 -1.97E-81 0.7 2.98E-05 0.020 1.15E-04 1.76E-60 7.16E-80 1 1.76E-05 0.021 1.15E-04 5.17E-59 0.OOE+00 1.5 8.47E-06 0.022 1.15E-04 1.25E-57 0.OOE+00 2 4.65E-06 0.023 1.15E-04 2.54E-56 0.OOE+00 3 1.80E-06 0.024 1.15E-04 4.40E-55 0.OOE+00 5 4.59E-07 0.025 1.15E-04 6.59E-54 0.OOE+00 7 1.68E-07 0.026 1.15E-04 8.66E-53 0.OOE+00 10 5.28E-08 0.027 1.1 5E-04 1.01 E-51 0.OOE+00 0.028 1.15E-04 1.05E-50 0.OOE+00 0.029 1.15E-04 9.79E-50 -3.98E-69 Last EXCEL spreadsheet rows are shown below:

9.998 5.28E-08 1.OOE+00 1.71 E-1 1 9.999 5.28E-08 1.OOE+00 1.71E-11 10.000 5.28E-08 1.OOE+00 5.28E-08 Page 19 of 23

PNPS-RPT-1 1-00001

  • Enterg ENG REPORT Re-assessment of Pilgrim Seismic Core Damage Frequency Entergy Fragility with 2010 EPRI Hazard (1Hz)

Total Seismic Core a Frquenc = I .29E-06 Plant Median Capacity 0.285 Plant HCLPF n/a Plant Composite Uncertainty, Pc 0.23 Frequency of Failure Delta Risk Seismic Level (g) Exceedance Probability at g level Annual 0.001 1.15E-04 1.68E-123 0.OOE+00 Acceleration Frequency of 0.0015 1.15E-04 6.10E-109 0.00E+00 (g) Exceedance 0.002 1.15E-04 1.61E-94 1.61E-100 0.001 1.15E-04 0.003 1.14E-04 7.21 E-82 1.22E-87 0.0015 1.15E-04 0.004 1.12E-04 5.03E-73 6.54E-79 0.002 1.15E-04 0.005 1.11E-04 2.47E-66 6.75E-72 0.003 1.14E-04 0.006 1.08E-04 5.13E-61 1.1 6E-66 0.005 1.11E-04 0.007 1.06E-04 1.21 E-56 4.21 E-62 0.007 1.06E-04 0.008 1.03E-04 5.93E-53 1.76E-58 0.01 9.70E-05 0.009 9.96E-05 8.78E-50 2.26E-55 0.015 8.23E-05 0.010 9.70E-05 5.13E-47 1.88E-52 0.02 6.95E-05 0.011 9.33E-05 1.42E-44 4.60E-50 0.03 5.01 E-05 0.012 9.01E-05 2.16E-42 6.20E-48 0.05 2.81 E-05 0.013 8.72E-05 1.97E-40 5.10E-46 0.07 1.74E-05 0.014 8.46E-05 1.19E-38 2.77E-44 0.1 9.61 E-06 0.015 8.23E-05 4.97E-37 1.52E-42 0.15 4.49E-06 0.016 7.92E-05 1.53E-35 4.23E-41 0.2 2.49E-06 0.017 7.65E-05 3.59E-34 9.06E-40 0.3 1.02E-06 0.018 7.39E-05 6.66E-33 1.54E-38 0.5 2.99E-07 0.019 7.16E-05 1.01E-31 2.14E-37 0.7 1.24E-07 0.020 6.95E-05 1.26E-30 3.39E-36 1 4.52E-08 0.021 6.68E-05 1.35E-29 3.32E-35 1.5 1.29E-08 0.022 6.44E-05 1.24E-28 2.81 E-34 2 4.90E-09 0.023 6.21 E-05 9.98E-28 2.09E-33 3 1.12E-09 0.024 6.OOE-05 7.13E-27 1.39E-32 5 1.41E-10 0.025 5.80E-05 4.56E-26 8.25E-32 0.026 5.62E-05 2.64E-25 4.46E-31 0.027 5.45E-05 1.40E-24 2.21 E-30 0.028 5.30E-05 6.80E-24 1.01 E-29 0.029 5.15E-05 3.06E-23 4.26E-29 Last EXCEL spreadsheet rows are shown below:

4.998 1.41E-10 1.OOE+00 1.15E-13 4.999 1.41E-10 1.OOE+00 1.14E-13 5.000 1.41E-10 1.OOE+00 1.41E-10 Page 20 of 23

ENG REPORT PNPS-RPT-1 1-00001

  • Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency Entergy Fragilitv - SHIP Adjusted with 2010 EPRI Hazard (PGA)

Total Seismic Core D e Frequenc 1.46E-0 Plant Median Capacity 0.82 Plant HCLPF 0.480 Plant Composite Uncertainty, j3c 0.23 Frequency of Failure Delta Risk Seismic Level (g) Exceedance Probability at g level Annual 0.001 1.15E-04 2.87E-175 0.OOE+00 Acceleration Frequency of 0.0015 1.1 5E-04 8.57E-1 58 0.OOE+00 (g) Exceedance 0.002 1.15E-04 2.78E-140 0.OOE+00 0.001 1.15E-04 0.003 1.15E-04 1.02E-124 4.14E-144 0.0015 1.15E-04 0.004 1.15E-04 1.06E-113 -4.32E-133 0.002 1.15E-04 0.005 1.15E-04 2.84E-105 1.16E-124 0.003 1.15E-04 0.006 1.15E-04 1.65E-98 -6.71E-118 0.005 1.15E-04 0.007 1.15E-04 6.75E-93 2.75E-112 0.007 1.15E-04 0.008 1.15E-04 3.99E-88 0.OOE+00 0.01 1.15E-04 0.009 1.15E-04 5.41E-84 -2.20E-103 0.015 1.15E-04 0.010 1.15E-04 2.31E-80 9.41E-100 0.02 1.15E-04 0.011 1.15E-04 3.93E-77 0.00E+00 0.03 1.15E-04 0.012 1.15E-04 3.13E-74 0.OOE+00 0.05 1.15E-04 0.013 1.15E-04 1.33E-71 0.O0E+00 0.07 1.11E-04 0.014 1.15E-04 3.30E-69 -1.34E-88 0.1 1.02E-04 0.015 1.15E-04 5.20E-67 2.12E-86 0.15 8.59E-05 0.016 1.15E-04 5.55E-65 0.OOE+00 0.2 7.20E-05 0.017 1.15E-04 4.20E-63 0.OOE+00 0.3 5.22E-05 0.018 1.15E-04 2.35E-61 0.OOE+00 0.5 2.99E-05 0.019 1.15E-04 1.01E-59 -4.11E-79 0.7 1.83E-05 0.020 1.15E-04 3.43E-58 1.40E-77 1 9.54E-06 0.021 1.15E-04 9.43E-57 0.OOE+00 1.5 3.98E-06 0.022 1.15E-04 2.14E-55 0.OOE+00 2 1.95E-06 0.023 1.15E-04 4.09E-54 0.OOE+00 3 6.19E-07 0.024 1.15E-04 6.68E-53 0.OOE+00 5 1.10E-07 0.025 1.15E-04 9.47E-52 0.00E+00 7 2.92E-08 0.026 1.15E-04 1.1 8E-50 0.OOE+00 10 5.97E-09 0.027 1.15E-04 1.30E-49 0.OOE+00 0.028 1.15E-04 1.28E-48 0.OOE+00 0.029 1.15E-04 1.15E-47 -4.66E-67 Last EXCEL spreadsheet rows are shown below:

9.998 5.98E-09 1.OOE+00 2.66E-12 9.999 5.97E-09 1.OOE+00 2.66E-12 10.000 5.97E-09 1.OOE+00 5.97E-09 Page 21 of 23

PNPS-RPT-1 1-00001

  • Entergy ENG REPORT Re-assessment of Pilgrim Seismic Core Damage Frequency Entergy Fragility - SHIP Adjusted with 2010 EPRI Hazard (10Hz)

I Total Seismic Core Damaueo Freuencv = I 1.22E-05 I Plant Median Capacity 1.271 Plant HCLPF n/a Plant Composite Uncertainty, Pc 0.23 Frequency of Failure Delta Risk Seismic Level (g) Exceedance Probability at g level Annual 0.001 1.15E-04 2.01E-199 0.OOE+00 Acceleration Frequency of 0.0015 1.15E-04 9.73E-181 0.OOE+00 (g) Exceedance 0.002 1.1 5E-04 6.04E-162 O.OOE+00 0.001 1.15E-04 0.003 1.15E-04 3.57E-145 1.45E-164 0.0015 1.15E-04 0.004 1.15E-04 2.99E-133 -1.21E-152 0.002 1.15E-04 0.005 1.15E-04 4.20E-124 1.71E-143 0.003 1.15E-04 0.006 1.15E-04 9.69E-1 17 -3.94E-136 0.005 1.15E-04 0.007 1.15E-04 1.29E-110 5.27E-1 30 0.007 1.15E-04 0.008 1.1 5E-04 2.15E-105 0.OOE+00 0.01 1.15E-04 0.009 1.15E-04 7.31E-101 -2.97E-120 0.015 1.15E-04 0.010 1.15E-04 7.16E-97 2.91E-1 16 0.02 1.15E-04 0.011 1.15E-04 2.58E-93 0.OOE+00 0.03 1.15E-04 0.012 1.15E-04 4.09E-90 0.OOE+00 0.05 1.15E-04 0.013 1.15E-04 3.27E-87 0.OOE+00 0.07 1.13E-04 0.014 1.1 5E-04 1.47E-84 -5.97E-1 04 0.1 1.09E-04 0.015 1.15E-04 4.02E-82 1.63E-101 0.15 9.93E-05 0.016 1.1 5E-04 7.18E-80 0.OOE+00 0.2 8.84E-05 0.017 1.15E-04 8.84E-78 0.OOE+00 0.3 6.94E-05 0.018 1.15E-04 7.84E-76 0.OOE+00 0.5 4.43E-05 0.019 1.15E-04 5.21E-74 -2.12E-93 0.7 2.98E-05 0.020 1.15E-04 2.67E-72 1.09E-91 1 1.76E-05 0.021 1.15E-04 1.09E-70 0.OOE+00 1.5 8.47E-06 0.022 1.15E-04 3.59E-69 0.OOE+00 2 4.65E-06 0.023 1.15E-04 9.82E-68 0.OOE+00 3 1.80E-06 0.024 1.15E-04 2.26E-66 0.OOE+00 5 4.59E-07 0.025 1.15E-04 4.46E-65 0.OOE+00 7 1.68E-07 0.026 1.15E-04 7.62E-64 0.OOE+00 10 5.28E-08 0.027 1.15E-04 1.14E-62 0.OOE+00 0.028 1.15E-04 1.52E-61 0.OOE+00 0.029 1.1 5E-04 1.80E-60 -7.31 E-80 Last EXCEL spreadsheet rows are shown below:

9.998 5.28E-08 1.OOE+00 1.71E-11 9.999 5.28E-08 1.00E+00 1.71E-11 10.000 5.28E-08 1.00E+00 5.28E-08 Page 22 of 23

ENG REPORT PNPS-RPT-1 1-00001

  • Enter~gy Re-assessment of Pilgrim Seismic Core Damage Frequency Enter*v Frazilitv - SHIP Adjusted with 2010 EPRI Hazard (1Hz)

Total Seismic Coramg Freqenc 5.57E-07 Plant Median Capacity 0.41 Plant HCLPF n/a Plant Composite Uncertainty, P3c 0.23 Frequency of Failure Delta Risk Seismic Level (g) Exceedance Probability at g level Annual 0.001 1.1 5E-04 2.78E-140 0.OOE+00 Acceleration Frequency of 0.0015 1.15E-04 1.02E-124 0.OOE+00 (g) Exceedance 0.002 1.15E-04 3.11E-109 3.11E-115 0.001 1.15E-04 0.003 1.14E-04 1.40E-95 2.37E-101 0.0015 1.15E-04 0.004 1.12E-04 5.46E-86 7.10E-92 0.002 1.15E-04 0.005 1.11E-04 1.06E-78 2.90E-84 0.003 1.14E-04 0.006 1.08E-04 6.92E-73 1.57E-78 0.005 1.11E-04 0.007 1.06E-04 4.37E-68 1.51 E-73 0.007 1.06E-04 0.008 1.03E-04 5.02E-64 1.49E-69 0.01 9.70E-05 0.009 9.96E-05 1.59E-60 4.10E-66 0.015 8.23E-05 0.010 9.70E-05 1.85E-57 6.78E-63 0.02 6.95E-05 0.011 9.33E-05 9.55E-55 3.09E-60 0.03 5.01E-05 0.012 9.01E-05 2.56E-52 7.36E-58 0.05 2.81 E-05 0.013 8.72E-05 3.97E-50 1.02E-55 0.07 1.74E-05 0.014 8.46E-05 3.88E-48 9.07E-54 0.1 9.61E-06 0.015 8.23E-05 2.57E-46 7.86E-52 0.15 4.49E-06 0.016 7.92E-05 1.21 E-44 3.36E-50 0.2 2.49E-06 0.017 7.65E-05 4.25E-43 1.07E-48 0.3 1.02E-06 0.018 7.39E-05 1.15E-41 2.67E-47 0.5 2.99E-07 0.019 7.16E-05 2.50E-40 5.31 E-46 0.7 1.24E-07 0.020 6.95E-05 4.41 E-39 1.18E-44 1 4.52E-08 0.021 6.68E-05 6.51 E-38 1.60E-43 1.5 1.29E-08 0.022 6.44E-05 8.17E-37 1.85E-42 2 4.90E-09 0.023 6.21 E-05 8.86E-36 1.86E-41 3 1.12E-09 0.024 6.OOE-05 8.41 E-35 1.63E-40 5 1.41E-10 0.025 5.80E-05 7.07E-34 1.28E-39 0.026 5.62E-05 5.33E-33 8.99E-39 0.027 5.45E-05 3.63E-32 5.73E-38 0.028 5.30E-05 2.25E-31 3.33E-37 0.029 5.15E-05 1.28E-30 1.78E-36 Last EXCEL spreadsheet rows are shown below:

4.998 1.41E-10 1.OOE+00 1.15E-13 4.999 1.41E-10 1.OOE+00 1.14E-13 5.000 1.41E-10 1.OOE+00 1.41E-10 Page 23 of 23

doEntergy ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Attachment 6 Email from Martin Stutzke (USNRC) to John Bretti (Entergy)

ENG REPORT PNPS-RPT-i 1-00001 ct-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency Prepared by: Clem Yeh Reviewed by: John Bretti The 2008 USGS Seismic Hazard Curves for the Entergy plants were transmitted to Entergy by the NRC is the following email.

Page 1 of 7

doENG REPORT PNPS-RPT-l 1-00001

'%-EntergY Re-assessment of Pilgrim Seismic Core Damage Frequency From: Stutzke, Martin rmailto: Martin.Stutzke~3nrc.gov]

Sent: Thursday, April 07, 2011 1:18 PM To: Bretti, John F

Subject:

RE: Pilgrim Seismic Hazard Curves used in GI-199 John -

Please find attached an EXCEL spreadsheet that provides the seismic hazard curves used in GI-199 based on the 2008 U.S. Geological Survey (USGS) hard rock seismic hazard estimates, adjusted for site soil conditions using the EPRI/SOG site amplification functions (EPRI NP-6395-D). I've provided information for all Entergy sites, just in case you have a use for it or wish to share with others at Entergy. Please note that these are mean values; the USGS has not issued uncertainty information (fractiles, medians, etc.) for the 2008 estimates. You can use www.earthguake.usgs.gov to get more information, including the final report (click on "Hazards"),

Regards, Marty From: Bretti, John F [mailto:JBretti(dentergy.com1 Sent: Thursday, April 07, 2011 11:35 AM To: Stutzke, Martin

Subject:

Pilgrim Seismic Hazard Curves used in GI-199 Martin, About a week ago, you had provided Dragos (Dan) Nuta with tabulated exceedance frequencies for the USGS hazard curves that were used for the Indian Point site. I was wondering ifyou could provide me with the corresponding hazard curve data used in GI-199 for Pilgrim Station.

Sincerely, John Bretti Senior Lead Engineer Entergy Nuclear 914-272-3433 Page 2 of 7

ENG REPORT PNPS-RPT-I 1-00001 cý-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency Seismic Hazard Curves Used in GI-199 Basis: 2008 USGS adjusted for site soil conditions using EPRI/SOG site amplification functions (EPRI NP-6395-D)

PGA 10 Hz 5 Hz 1 Hz exceedence exceedence exceedence exceedence acceleration frequency acceleration frequency acceleration frequency acceleration frequency Site Name s (per year) (g's) (per year) (g's) (per year) (g's) (per year)

Arkansas 0.0070 8.42E-03 0.0075 1.30E-02 0.0075 1.64E-02 0.0037 1.35E-02 0.0098 5.98E-03 0.0113 8.81E-03 0.0113 1.07E-02 0.0056 9.17E-03 0.0137 4.33E-03 0.0169 6.03E-03 0.0169 7.01E-03 0.0084 6.21E-03 0.0192 3.19E-03 0.0253 4.21E-03 0.0253 4.65E-03 0.0127 4.23E-03 0.0269 2.36E-03 0.0380 2.99E-03 0.0380 3.17E-03 0.0190 2.95E-03 0.0376 1.67E-03 0.0570 2.09E-03 0.0570 2.17E-03 0.0285 2.05E-03 0.0527 1.07E-03 0.0854 1.34E-03 0.0854 1.38E-03 0.0427 1.34E-03 0.0738 6.09E-04 0.1280 7.48E-04 0.1280 7.45E-04 0.0641 7.55E-04 0.1030 3.13E-04 0.1920 3.60E-04 0.1920 3.35E-04 0.0961 3.50E-04 0.1450 1.45E-04 0.2880 1.51 E-04 0.2880 1.27E-04 0.1440 1.32E-04 0.2030 6.33E-05 0.3900 7.34E-05 0.3900 5.61E-05 0.2160 4.11E-05 0.2840 2.68E-05 0.4320 5.68E-05 0.4320 4.19E-05 0.3240 1.07E-05 0.3970 1.14E-05 0.6490. 1.94E-05 0.6490 1.23E-05 0.4000 4.83E-06 0.5560 5.OOE-06 0.8000 1.09E-05 0.8000 6.39E-06 0.4870 2.15E-06 0.7780 2.23E-06 0.9730 6.31 E-06 0.9730 3.37E-06 0.7300 3.08E-07 0.9000 1.58E-06 1.4600 1.92E-06 1.4600 8.71E-07 0.9000 1.19E-07 1.0900 9.71E-07 2.1900 5.16E-07 2.1900 2.37E-07 1.0900 5.53E-08 1.5200 3.82E-07 3.2800 1.17E-07 3.2800 5.79E-08 1.6400 1.33E-08 2.1300 1.09E-07 5.0000 1.01 E-08 4.9200 7.72E-09 2.4600 2.59E-09 3.6900 3.16E-10 Fitzpatrick 0.0070 9.06E-03 0.0075 1.60E-02 0.0075 2.04E-02 0.0037 1.52E-02 0.0098 5.63E-03 0.0113 9.77E-03 0.0113 1.24E-02 0.0056 9.66E-03 0.0137 3.38E-03 0.0169 5.72E-03 0.0169 7.17E-03 0.0084 5.85E-03 0.0192 1.96E-03 0.0253 3.17E-03 0.0253 3.89E-03 0.0127 3.32E-03 0.0269 1.10E-03 0.0380 1.67E-03 0.0380 1.98E-03 0.0190 1.78E-03 0.0376 6.04E-04 0.0570 8.39E-04 0.0570 9.60E-04 0.0285 8.83E-04 0.0527 3.23E-04 0.0854 4.08E-04 0.0854 4.42E-04 0.0427 4.05E-04 0.0738 1.71E-04 0.1280 1.92E-04 0.1280 1.94E-04 0.0641 1.70E-04 0.1030 9.16E-05 0.1920 8.96E-05 0.1920 8.21E-05 0.0961 6.58E-05 0.1450 4.91 E-05 0.2880 4.19E-05 0.2880 3.46E-05 0.1440 2.40E-05 0.2030 2.73E-05 0.3900 2.40E-05 0.3900 1.83E-05 0.2160 8.50E-06 0.2840 1.55E-05 0.4320 1.99E-05 0.4320 1.48E-05 0.3240 3.04E-06 0.3970 8.81 E-06 0.6490 9.39E-06 0.6490 6.44E-06 0.4000 1.80E-06 0.5560 4.87E-06 0.8000 6.32E-06 0.8000 4.17E-06 0.4870 1.10E-06 0.7780 2.57E-06 0.9730 4.31E-06 0.9730 2.75E-06 0.7300 3.95E-07 0.9000 1.90E-06 1.4600 1.83E-06 1.4600 1.09E-06 0.9000 2.28E-07 1.0900 1.23E-06 2.1900 6.72E-07 2.1900 3.81E-07 1.0900 1.36E-07 1.5200 5.18E-07 3.2800 1.85E-07 3.2800 1.09E-07 1.6400 4.16E-08 2.1300 1.57E-07 5.0000 1.91E-08 4.9200 1.74E-08 2.4600 1.10E-08 I 1 1 3.6900 2.17E-09 Page 3 of 7

,ýEntergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Seismic Hazard Curves Used in GI-199 Basis: 2008 USGS adjusted for site soil conditions using EPRI/SOG site amplification functions (EPRI NP-6395-D)

PGA 10 Hz 5 Hz 4 1 Hz

+

Grand Gulf 0.0097 5.03E-03 0.0125 7.25E-03 0.0140 9.60E-03 0.0080 1.03E-02 0.0135 3.65E-03 0.0188 5.02E-03 0.0210 6.31 E-03 0.0120 6.95E-03 0.0188 2.63E-03 0.0277 3.54E-03 0.0313 4.23E-03 0.0179 4.69E-03 0.0259 1.80E-03 0.0412 2.43E-03 0.0466 2.83E-03 0.0269 3.16E-03 0.0360 1.12E-03 0.0612 1.53E-03 0.0695 1.77E-03 0.0401 2.11 E-03 0.0500 6.34E-04 0.0906 8.69E-04 0.1032 9.79E-04 0.0596 1.31 E-03 0.0696 3.31 E-04 0.1349 4.47E-04 0.1529 4.70E-04 0.0863 7.03E-04 0.0937 1.67E-04 0.1920 2.13E-04 0.2189 2.03E-04 0.1276 3.11E-04 0.1246 8.48E-05 0.2707 9.74E-05 0.3110 8.19E-05 0.1893 1.15E-04 0.1610 4.32E-05 0.3715 4.36E-05 0.4406 3.26E-05 0.2621 3.65E-05 0.2071 2.33E-05 0.4563 2.40E-05 0.5577 1.66E-05 0.3715 1.05E-05 0.2442 1.30E-05 0.4795 1.96E-05 0.6005 1.33E-05 0.5346 2.91 E-06 0.3176 7.43E-06 0.5906 8.70E-06 0.7528 5.52E-06 0.6400 1.54E-06 0.4448 4.23E-06 0.6640 5.70E-06 0.7840 3.53E-06 0.7792 8.75E-07 0.6224 2.32E-06 0.7784 3.81 E-06 0.8757 2.35E-06 1.1680 3.23E-07 0.7200 1.74E-06 1.1680 1.63E-06 1.1680 9.62E-07 1.4400 1.93E-07 0.8502 1.15E-06 1.7520 6.14E-07 1.7520 3.47E-07 1.7440 1.1 7E-07 1.1552 4.96E-07 2.6240 1.71 E-07 2.6240 1.01 E-07 2.6240 3.68E-08 1.5762 1.53E-07 4.0000 1.69E-08 3.9360 1.63E-08 3.9360 9.90E-09 5.9040 1.94E-09 I t 1*

Indian Point 0.0070 8.02E-03 0.0075 1.20E-02 0.0075 1.47E-02 0.0037 1.27E-02 0.0098 5.72E-03 0.0113 8.43E-03 0.0113 9.73E-03 0.0056 8.13E-03 0.0137 4.04E-03 0.0169 5.86E-03 0.0169 6.37E-03 0.0084 4.98E-03 0.0192 2.82E-03 0.0253 3.98E-03 0.0253 4.07E-03 0.0127 2.89E-03 0.0269 1.95E-03 0.0380 2.62E-03 0.0380 2.52E-03 0.0190 1.63E-03 0.0376 1.34E-03 0.0570 1.69E-03 0.0570 1.53E-03 0.0285 8.78E-04 0.0527 9.06E-04 0.0854 1.06E-03 0.0854 9.08E-04 0.0427 4.61 E-04 0.0738 6.09E-04 0.1280 6.49E-04 0.1280 5.26E-04 0.0641 2.37E-04 0.1030 4.07E-04 0.1920 3.87E-04 0.1920 2.97E-04 0.0961 1.21E-04 0.1450 2.65E-04 0.2880 2.23E-04 0.2880 1.62E-04 0.1440 6.10E-05 0.2030 1.71E-04 0.3900 1.44E-04 0.3900 1.01E-04 0.2160 3.04E-05 0.2840 1.07E-04 0.4320 1.24E-04 0.4320 8.52E-05 0.3240 1.47E-05 0.3970 6.46E-05 0.6490 6.45E-05 0.6490 4.23E-05 0.4000 9.79E-06 0.5560 3.69E-05 0.8000 4.49E-05 0.8000 2.87E-05 0.4870 6.57E-06 0.7780 1.97E-05 0.9730 3.13E-05 0.9730 1.95E-05 0.7300 2.68E-06 0.9000 1.46E-05 1.4600 1.37E-05 1.4600 8.09E-06 0.9000 1.61 E-06 1.0900 9.58E-06 2.1900 5.12E-06 2.1900 2.91 E-06 1.0900 9.81 E-07 1.5200 4.05E-06 3.2800 1.42E-06 3.2800 8.50E-07 1.6400 3.08E-07 2.1300 1.24E-06 5.0000 1.42E-07 4.9200 1.38E-07 2.4600 8.23E-08 3.6900 1.60E-08 Palisades 0.0148 3.93E-03 0.0178 6.02E-03 0.0215 8.05E-03 0.0040 9.78E-03 0.0207 2.48E-03 0.0266 3.82E-03 0.0320 4.97E-03 0.0060 6.30E-03 0.0288 1.46E-03 0.0392 2.28E-03 0.0473 2.89E-03 0.0092 3.97E-03 0.0401 8.12E-04 0.0584 1.28E-03 1 0.0698 1.55E-03 0.0140 2.39E-03 Page 4 of 7

.1Entergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Seismic Hazard Curves Used in GI-199 Basis: 2008 USGS adjusted for site soil conditions using EPRI/SOG site amplification functions (EPRI NP-6395-D) r V PGA 10 Hz 5 Hz 1 Hz 0.0560 4.40E-04 0.0870 6.90E-04 0.1037 7.69E-04 0.0211 1.32E-03 0.0771 2.37E-04 0.1294 3.61 E-04 0.1539 3.66E-04 0.0328 6.22E-04 0.1065 1.26E-04 0.1922 1.82E-04 0.2272 1.67E-04 0.0495 2.47E-04 0.1446 6.76E-05 0.2790 8.82E-05 0.3213 7.30E-05 0.0763 8.30E-05 0.1957 3.69E-05 0.3955 4.12E-05 0.4608 3.11E-05 0.1163* 2.47E-05 0.2610 2.04E-05 0.5443 1.89E-05 0.6365 1.31 E-05 0.1757 7.03E-06 0.3410 1.17E-05 0.6864 1.05E-05 0.8229 6.92E-06 0.2743 1.96E-06 0.4203 6.81 E-06 0.7301 8.63E-06 0.8986 5.61 E-06 0.4147 6.61 E-07 0.5161 3.90E-06 1.0449 3.97E-06 1.2591 2.43E-06 0.5200 3.98E-07 0.6283 2.13E-06 1.2560 2.64E-06 1.4560 1.57E-06 0.6428 2.44E-07 0.7936 1.08E-06 1.4206 1.77E-06 1.6444 1.01 E-06 0.9636 8.34E-08 0.9000 7.86E-07 1.7228 7.12E-07 1.9126 3.74E-07 1.1880 4.57E-08 1.0464 4.97E-07 2.1900 2.39E-07 2.1900 1.17E-07 1.4388 2.55E-08 1.3832 1.97E-07 2.6240 5.81 E-08 2.6240 2.91 E-08 2.1648 6.43E-09 1.8744 5.63E-08 4.0000 5.05E-09 3.9360 3.95E-09 3.2472 1.31 E-09 4.8708 1.65E-10 I I I 4.

Pilgrim 0.0148 6.76E-03 0.0178 1.04E-02 0.0215 1.31 E-02 0.0040 1.16E-02 0.0207 4.63E-03 0.0266 7.07E-03 0.0320 8.44E-03 0.0060 7.39E-03 0.0288 3.12E-03 0.0392 4.70E-03 0.0473 5.30E-03 0.0092 4.48E-03 0.0401 2.06E-03 0.0584 3.03E-03 0.0698 3.21 E-03 0.0140 2.57E-03 0.0560 1.34E-03 0.0870 1.88E-03 0.1037 1.88E-03 0.0211 1.40E-03 0.0771 8.68E-04 0.1294 1.14E-03 0.1539 1.07E-03 0.0328 7.24E-04 0.1065 5.55E-04 0.1922 6.69E-04 0.2272 5.92E-04 0.0495 3.58E-04 0.1446 3.52E-04 0.2790 3.83E-04 0.3213 3.20E-04 0.0763 1.71E-04 0.1957 2.23E-04 0.3965 2.15E-04 0.4608 1.69E-04 0.1163 8.09E-05 0.2610 1.38E-04 0.5443 1.18E-04 0.6365 8.74E-05 0.1757 3.81 E-05 0.3410 8.57E-05 0.6864 7.37E-05 0.8229 5.26E-05 0.2743 1.79E-05 0.4203 5.23E-05 0.7301 6.26E-05 0.8986 4.41 E-05 0.4147 8.21 E-06 0.5161 3.11 E-05 1.0449 3.20E-05 1.2591 2.14E-05 0.5200 5.37E-06 0.6283 1.77E-05 1.2560 2.21 E-05 1.4560 1.44E-05 0.6428 3.55E-06 0.7936 9.51 E-06 1.4206 1.54E-05 1.6444 9.77E-06 0.9636 1.41 E-06 0.9000 7.08E-06 1.7228 6.74E-06 1.9126 4.03E-06 1.1880 8.42E-07 1.0464 4.65E-06 2.1900 2.52E-06 2.1900 1.44E-06 1.4388 5.10E-07 1.3832 1.96E-06 2.6240 7.OOE-07 2.6240 4.16E-07 2.1648 1.59E-07 1.8744 5.99E-07 4.0000 7.31 E-08 3.9360 6.69E-08 3.2472 4.28E-08 4.8708 8.57E-09 I I I River Bend 0.0056 4.07E-03 0.0080 5.73E-03 0.0138 7.19E-03 0.0104 8.20E-03 0.0078 2.87E-03 0.0121 4.05E-03 0.0206 4.88E-03 0.0157 5.56E-03 0.0110 1.91 E-03 0.0181 2.73E-03 0.0304 3.22E-03 0.0235 3.75E-03 0.0154 1.17E-03 0.0271 1.70E-03 0.0450 1.96E-03 0.0353 2.47E-03 0.0215 6.76E-04 0.0407 9.82E-04 0.0638 1.08E-03 0.0524 1.54E-03 0.0301 3.87E-04 0.0604 5.45E-04 0.0946 5.52E-04 0.0784 8.39E-04 0.0422 2.22E-04 0.0897 2.96E-04 0.1401 2.73E-04 0.1153 3.88E-04 0.0590 1.29E-04 0.1280 1.56E-04 0.1920 1.32E-04 0.1654 1.53E-04 Page 5 of 7

ENG REPORT PNPS-RPT-I 1-00001

!,-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency Seismic Hazard Curves Used in GI-199 Basis: 2008 USGS adjusted for site soil conditions using EPRI/SOG site amplification functions (EPRI NP-6395-D)

PGA 10 Hz 5 Hz 1 Hz 0.0824 7.57E-05 0.1766 8.06E-05 0.2534 6.26E-05 0.2153 5.38E-05 0.1160 4.44E-05 0.2592 4.05E-05 0.3168 2.93E-05 0.2261 1.82E-05 0.1624 2.63E-05 0.3198 2.37E-05 0.3705 1.65E-05 0.2484 6.43E-06 0.2272 1.55E-05 0.3499 1.98E-05 0.3974 1.35E-05 0.2592 2.43E-06 0.3176 8.99E-06 0.5192 9.38E-06 0.5257 6.16E-06 0.3200 1.53E-06 0.4448 4.97E-06 0.6400 6.33E-06 0.6400 4.06E-06 0.3896 9.98E-07 0.6224 2.59E-06 0.7784 4.32E-06 0.7784 2.72E-06 0.5840 3.90E-07 0.7200 1.90E-06 1.1680 1.84E-06 1.1680 1.10E-06 0.7200 2.31 E-07 0.8720 1.23E-06 1.7520 6.76E-07 1.7520 3.89E-07 0.8720 1.39E-07 1.2160 5.10E-07 2.6240 1.88E-07 2.6240 1.12E-07 1.3120 4.28E-08 1.7040 1.55E-07 4.0000 1.97E-08 3.9360 1.82E-08 1.9680 1.13E-08 2.9520 2.21 E-09 I I

  • 4~

Vermont Yankee 0.0070 1.02E-02 0.0075 1.70E-02 0.0075 2.07E-02 0.0037 1.51 E-02 0.0098 6.67E-03 0.0113 1.11 E-02 0.0113 1.32E-02 0.0056 9.73E-03 0.0137 4.23E-03 0.0169 6.94E-03 0.0169 7.99E-03 0.0084 5.99E-03 0.0192 2.58E-03 0.0253 4.12E-03 0.0253 4.59E-03 0.0127 3.49E-03 0.0269 1.53E-03 0.0380 2.31 E-03 0.0380 2.49E-03 0.0190 1.93E-03 0.0376 8.88E-04 0.0570 1.24E-03 0.0570 1.28E-03 0.0285 9.99E-04 0.0527 5.00E-04 0.0854 6.34E-04 0.0854 6.30E-04 0.0427 4.83E-04 0.0738 2.77E-04 0.1280 3.13E-04 0.1280 2.94E-04 0.0641 2.16E-04 0.1030 1.53E-04 0.1920 1.51 E-04 0.1920 1.32E-04 0.0961 9.01 E-05 0.1450 8.35E-05 0.2880 7.20E-05 0.2880 5.79E-05 0.1440 3.55E-05 0.2030 4.67E-05 0.3900 4.13E-05 0.3900 3.12E-05 0.2160 1.35E-05 0.2840 2.64E-05 0.4320 3.43E-05 0.4320 2.53E-05 0.3240 5.11 E-06 0.3970 1.49E-05 0.6490 1.61 E-05 0.6490 1.10E-05 0.4000 3.06E-06 0.5560 8.15E-06 0.8000 1.08E-05 0.8000 7.11 E-06 0.4870 1.89E-06 0.7780 4.25E-06 0.9730 7.30E-06 0.9730 4.66E-06 0.7300 6.76E-07 0.9000 3.14E-06 1.4600 3.06E-06 1.4600 1.83E-06 0.9000 3.88E-07 1.0900 2.04E-06 2.1900 1.11 E-06 2.1900 6.34E-07 1.0900 2.30E-07 1.5200 8.51 E-07 3.2800 3.05E-07 3.2800 1.81 E-07 1.6400 6.95E-08 2.1300 2.58E-07 5.0000 3.15E-08 4.9200 2.87E-08 2.4600 1.83E-08 3.6900 3.62E-09 Waterford 0.0056 3.62E-03 0.0060 5.15E-03 0.0120 6.35E-03 0.0087 7.46E-03 0.0078 2.48E-03 0.0090 3.58E-03 0.0181 4.28E-03 0.0132 5.04E-03 0.0110 1.60E-03 0.0135 2.34E-03 0.0270 2.73E-03 0.0197 3.37E-03 0.0154 9.80E-04 0.0202 1.44E-03 0.0397 1.61E-03 0.0292 2.17E-03 0.0215 5.92E-04 0.0304 8.58E-04 0.0570 8.91 E-04 0.0422 1.29E-03 0.0301 3.60E-04 0.0456 5.00E-04 0.0804 4.78E-04 0.0613 6.59E-04 0.0422 2.19E-04 0.0683 2.84E-04 0.1179 2.51 E-04 0.0820 2.90E-04 0.0590 1.33E-04 0.1024 1.57E-04 0.1562 1.29E-04 0.1199 1.12E-04 0.0824 8.14E-05 0.1536 8.34E-05 0.1843 6.42E-05 0.1634 4.13E-05 0.1160 4.91 E-05 0.2304 4.33E-05 0.2362 3.14E-05 0.1872 1.56E-05 0.1624 2.98E-05 0.3120 2.61 E-05 0.3120 1.82E-05 0.1793 6.20E-06 0.2272 1.79E-05 0.3456 2.20E-05 0.3456 1.51 E-05 0.2592 2.66E-06 Page 6 of 7

ONEnterg ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Seismic Hazard Curves Used in GI-199 Basis: 2008 USGS adjusted for site soil conditions using EPRI/SOG site amplification functions (EPRI NP-6395-D)

PGA 10 Hz 5 Hz 1 Hz 0.3176 1.05E-05 0.5192 1.09E-05 0.5192 7.18E-06 0.3200 1.73E-06 0.4448 5.95E-06 0.6400 7.46E-06 0.6400 4.81E-06 0.3896 1.14E-06 0.6224 3.18E-06 0.7784 5.17E-06 0.7784 3.25E-06 0.5840 4.49E-07 0.7200 2.36E-06 1.1680 2.25E-06 1.1680 1.33E-06 0.7200 2.66E-07 0.8720 1.55E-06 1.7520 8.33E-07 1.7520 4.70E-07 0.8720 1.61 E-07 1.2160 6.52E-07 2.6240 2.30E-07 2.6240 1.35E-07 1.3120 4.96E-08 1.7040 1.99E-07 4.0000 2.35E-08 3.9360 2.14E-08 1.9680 1.31 E-08 I 1 1 2.9520 2.53E-09 Page 7 of 7

ENG REPORT PNPS-RPT-11-00001

!'--Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency Attachment 7 SHIP Model Input and Output

'ENG A REPORT PNPS-RPT-1 1-00001 z-Enter~gy Re-assessment of Pilgrim Seismic Core Damage Frequency Prepared by: John Favara Reviewed by: Clem Yeh

Background

The plant seismic core damage frequency (SCDF) from the Pilgrim Individual Plant Examination of External Events (IPEEE) Report Seismic Probabilistic Assessment (SPRA) was calculated from the systems model using the SHIP (Seismic Hazard Integration Package) code. The model incorporated seismic fragilities for components into event trees and fault trees. These resulted in sequences where system-induced failures could lead to core damage. The effect on plant SCDF of changing the fragility of a given component (structure, system or equipment) is determined by changing the fragility parameters in the model and re-running it using the SHIP software.

This attachment describes the specific SHIP evaluations performed in re-evaluating the Pilgrim SCDF based on revised seismic capacity of important seismic components, update of random failure data for significant non-seismic components, realistic consideration of operator action failure probability to align suppression pool cooling given ground acceleration greater than 0.5g, and latest success criteria on impact of loss of quad room cooling for the RHR, Core Spray, CRD, and HPCI systems.

The Pilgrim IPEEE Report gives a point estimate SCDF of 5.82E-05/year.

In the Pilgrim SPRA seismic sequence quantification entailed the integration of the seismic hazard curve, component fragilities and the seismic system logic model to evaluate the frequency of system failure. The seismic hazard curve used was the 1989 Electric Power Research Institute (EPRI) PGA (peak ground acceleration) curve. The quantification was performed in three steps using the seismic component fragilities and SHIP computer code to determine the seismic sequences frequencies and plant fragilities along with the seismic point estimate core damage firequencies. The steps were:

1. The SPRA logic model was initially quantified, using the current version of SAIC's CAFTA (computer aided fault tree analysis) software, to produce seismic initiated accident sequence cutsets at three PGA levels (i.e., 0.2g, 0.4g, and 0.6g). The cutsets were provided as input to the initial risk quantification over the entire spectrum of the seismic hazard curve. The cutsets were also used to rank important seismic and non-seismic failures for subsequent sensitivity analyses. The results of the initial quantification, and the importance rankings were used to determine which seismic failures required more detailed fragility analysis. These results were also used to determine the need for more detailed fragility and human reliability analysis
2. Re-quantified the SPRA logic models with revised inputs to produce seismic initiated accident sequence cutsets at three seismic hazard levels (i.e., 0.2g, 0.4g, and 0.6g). The Page 1 of 102

'.'Entergy ENG REPORT PNPS-RPT- 1l-0001 Re-assessment of Pilgrim Seismic Core Damage Frequency re-quantified cutsets were provided as input for final importance ranking and quantification.

3. Quantify the Pilgrim SPRA model using the SHIP software package. The SHIP program integrates the SPRA logic model cutsets, the site seismic hazard curve, random failures, operator actions and the individual component seismic fragilities over the full range of seismic risk. The SHIP quantification results include the estimate of the plant core damage frequency and the plant level fragility curve.

Two initiating events (loss-of-offsite power and small break LOCA) and 13 seismic sequences were identified and solved for the SPRA. The 13 seismic sequences were quantified using the EPRI hazard curves and best-estimate seismic fragilities and random failure frequencies. The total SCDF is the sum of the SCDFs for each sequence. The contribution of each sequence to the SCDF is equal to its SCDF divided by the total SCDF.

Of the 13 seismic-induced accident sequences, the top six dominant accident sequences leading to core damage shown in the Pilgrim IPEEE contribute almost 98 percent of the total core damage frequency. The seismic sequences, ranked according to their contribution to core damage frequency, are listed below..

CDF Sequence Contribution Description Rank Percent SITQU 1 46.66 Loss of makeup at high RPV pressure SITW 2 35.92 Loss of containment heat removal SISL2 3 5.25 Small LOCA with high pressure makeup failure SISLi 4 4.88 Small LOCA with containment control failure SURROGATE 5 2.81 Surrogate element to represent all "screened out" components SIVR1 6 2.6 Vessel Rupture SIATWS1 7 1.01 ATWS SIAOUT1 8 0.5 Large LOCA outside containment SISORV2 9 0.13 SORV with successful HP injection but with LP injection failure SISORV1 10 0.1 SORV with successful HP injection but containment control failure SISORV4 11 0.09 SORV with HP and LP injection failure SISORV3 12 0.03 SORV with successful LP injection but containment control failure SIISL1 13 0 Interfacing system LOCAs Although, it is not possible, at this time, to change the CAFTA logic model use to generate the seismic sequences cutsets use as inputs to the model. The capability exists to run SHIP and hence, examined the impact on SCDF. Specifically, five runs were performed.

I. Predict the change in SCDF based on revised SPRA model and use of the original EPRI hazard curves. The revised SPRA model reflect realistic changes in systems, structures, and components seismic capacity, random failure rates, success criteria, and operator Page 2 of 102

-Entergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency actions. This removes some inherent conservatism from the IPEEE SPRA model (for example low seismic fragilities and outdated plant failure data).

2. Predict the change in SCDF based on the original IPEEE SPRA model and use of USGS hazard curves. This provides some perspective regarding the potential conservatism in the NRC's seismic hazard.
3. Determine SCDF contribution for seismic components only based on the original IPEEE SPRA model and use of USGS hazard curves.
4. Predict the change in SCDF based on the revised SPRA model (as described in item #1 above) and use of the USGS hazard curves.
5. Determine SCDF contribution for seismic only components based on the revised SPRA model (as described in item #1 above) and use of USGS hazard curves.
6. Predict the change in SCDF based on the original IPEEE SPRA model and use of the updated EPRI hazard curves. This provides some perspective regarding the impact of the updated EPRI hazards curves versus the IPEEE EPRI hazard curves and the 2008 USGS hazard curves.
7. Determine SCDF contribution for seismic only components based on the original IPEEE SPRA model and use of the updated EPRI hazard curves.
8. Predict the change in SCDF based on the revised SPRA model (as described in item #1 as above) and use of the updated EPRI hazard curves.
9. Determine SCDF contribution for seismic only components based on the revised SPRA model (as described in item #1 as above) and use of the updated EPRI hazard curves.

The salient results from these runs are summarized in Table A-1.

Page 3 of 102

S'Enterv ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Table A-I Summary of SHIP Results Ship Run EPRI Original Curves (revised model) Seismic and Non-Seismic

  1. 1 Seismic Core Damage Frequency 2.85E-5/year Median Capacity 0.57g HCLPF 0.33g Ship Run 2008 USGS Curves Seismic and Non-Seismic
  1. 2 Seismic Core Damage Frequency 3.78E-05/year Median Capacity 0.48g HCLPF 0.25g Ship Run 2008 USGS Curves Seismic Only
  1. 3 Seismic Core Damage Frequency 2.33E-05/year Median Capacity 0.56g HCLPF 0.32g Ship Run 2008 USGS Curves (revised model) Seismic and Non-Seismic
  1. 4 Seismic Core Damage Frequency 2.14E-05/year Median Capacity 0.57g HCLPF 0.33g Ship Run 2008 USGS Curves (revised model) Seismic Only
  1. 5 Seismic Core Damage Frequency 1.20E-05/year Median Capacity 0.69g HCLPF 0.38g Ship Run Updated EPRI Curves Seismic and Non-Seismic
  1. 6 Seismic Core Damage Frequency 2.15E-05/year Median Capacity 0.49g HCLPF 0.25g Ship Run Updated EPRI Curves Seismic Only
  1. 7 Seismic Core Damage Frequency 1.56E-05/year Median Capacity 0.57g HCLPF 0.32g Page 4 of 102

A t v ENG REPORT PNPS-RPT-1 1-00001

%-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency Table A-I Summary of SHIP Results Ship Run Updated EPRI Curves (revised model) Seismic and Non-Seismic

  1. 8 Seismic Core Damage Frequency 1.44E-05/year Median Capacity 0.57g HCLPF 0.33g Ship Run Undated EPRI Curves (revised model) Seismic Only
  1. 9 Seismic Core Damage Frequency 8.97E-06/year Median Capacity 0.69g HCLPF 0.38g Page 5 of 102

A EnENG REPORT PNPS-RPT-I 1-00001 e-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation #1 Predict the change in SCDF based on revised SPRA model and use of the original EPRI hazard curves. The revised SPRA model reflect realistic changes in systems, structures, and components seismic capacity, random failure rates, success criteria, and operator actions. This removes some inherent conservatism from the IPEEE SPRA model (for example low seismic fragilities and outdated plant failure data).

List of SHIP input files:

i. Names File: PILCDF1.NAM (This file lists the names of all other data files to be used by SHIP for Case #1). [see page 22 for details]

ii. Basic Input File: PILCDFI .GEN (This file contains basic parameters relevant to the SHIP Case #1 application). [see page 22 for details]

iii. Basic Event Data File: PILCDFI.CMP (This file contains data pertaining to seismic fragilities, random failures, and operator actions for SHIP for Case #1). This file contains the revise data on plant components seismic fragilities, updated random failure rate, less conservative operator actions failure probability to align suppression pool cooling, and current system success criteria on quad rooms cooling. [see page 23 for details]

iv. System Data File: PILCDF1.SYS (This file contains a list of systems to be analyzed for SHIP for Case #1. Note that the cutsets for each system will be read from separate files). [see page 29 for details]

v. Sequence Data File: PILCDFI .SEQ (This file contains data regarding sequences and plant damage states for SHIP for Case #1). [See page 29 for details]

vi. Hazard Data File: PILCDF1.HAZ (This file contains data related to the IPEEE EPRI seismic hazard for the Pilgrim site for SHIP for Case #1). [see page 29 for details]

vii. Cutset File: LMCDF.RPT (This file contains the cutsets for the systems to be analyzed for SHIP for Case #1. Note that for Pilgrim SPRA, the CDFALL system is the only system to be analyzed. These cutsets are contained in LMCDF.RPT).

viii. SHIP Output File: SCDF1 .BAS (This file represents the SHIP output for SHIP for Case #1. This file contains information on names of all input files, information of all input files, and information on core damage frequency (overall and individual sequences), plant median capacity, and high confidence of a low probability of failure HCLPF] information). [See page 30 for details]

Page 6 of 102

90Enterg ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Results for SHIP Evaluation #1 SCDF (using IPEEE EPRI data) = 2.85E-5/year Median Capacity (using IPEEE EPRI data) = 0.57g HCLPF (using IPEEE EPRI data)= 0.33g Page 7 of 102

S.'Entergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation #2 Predict the change in SCDF based on the original IPEEE SPRA model and use of USGS hazard curves. This provides some perspective regarding the potential conservatism in the NRC's seismic hazard.

List of SHIP input files:

i. Names Filet PILUSGS.NAM (This file lists the names of all other data files to be used by SHIP for Case #2). [see page 31 for details]

ii. Basic Input File: PILUSGS.GEN (This file contains basic parameters relevant to the SHIP Case #2 application). [see page 31 for details]

iii. Basic Event Data File: PILUSGS.CMP (This file contains data pertaining to seismic fragilities, random failures, and operator actions for SHIP for Case #2). [see page 32 for details]

iv. System Data File: PILUSGS.SYS (This file contains a list of systems to be analyzed for SHIP for Case #2. Note that the cutsets for each system will be read from separate files) [see page 38 for details]

v. Sequence Data File: PILUSGS.SEQ (This file contains data regarding sequences and plant damage states for SHIP for Case #2). [See page 38 for details]

vi. Hazard Data File: PILUSGS.HAZ (This file contains data related to the 2008 USGS seismic hazard for the Pilgrim site for SHIP for Case #2). [see page 38 for details]

vii. Cutset File: LMCDF.RPT (This file contains the cutsets for the systems to be analyzed for SHIP for Case #2. Note that for Pilgrim SPRA, the CDFALL system is the only system to be analyzed. These cutsets are contained in LMCDF.RPT).

viii. SHIP Output File: USGSCDF.BAS (This file represents the SHIP output for SHIP for Case #2. This file contains information on names of all input files, information of all input files, and information on core damage frequency (overall and individual sequences), plant median capacity, and high confidence of a low probability of failure HCLPF] information). [See page 39 for details]

Results for SHIP Evaluation #2 SCDF (using Updated USGS data) = 3.78E-5/year Median Capacity (using Updated USGS data) = 0.49g HCLPF (using Updated USGS data)= 0.25g Page 8 of 102

S.'Entergy ENG REPORT PN PS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation #3 Determine SCDF contribution for seismic only components based on the original IPEEE SPRA model and use of USGS hazard curves.

List of SHIP input files:

i. Names File: PILRUN1.NAM (This file lists the names of all other data files to be used by SHIP for Case #3). [see page 40 for details]

ii. Basic Input File: PILRUN1.GEN (This file contains basic parameters relevant to the SHIP Case #3 application). [see page 40 for details]

iii. Basic Event Data File: PILRUN1I.CMP (This file contains data pertaining to seismic fragilities, random failures, and operator actions for SHIP for Case #3). [see page 41 for details]

iv. System Data File: PILRUN1.SYS (This file contains a list of systems to be analyzed for SHIP for Case #3. Note that the cutsets for each system will be read from separate files) [see page 47 for details]

v. Sequence Data File: PILRUN1.SEQ (This file contains data regarding sequences and plant damage states for SHIP for Case #3). [See page 47 for details]

vi. Hazard Data File: PILRUN1 .HAZ (This file contains data related to the IPEEE EPRI seismic hazard for the Pilgrim site for SHIP for Case #3). [see page 47 for details]

vii. Cutset File: LMCDF.RPT (This file contains the cutsets for the systems to be analyzed for SHIP for Case #3. Note that for Pilgrim SPRA, the CDFALL system is the only system to be analyzed. These cutsets are contained in LMCDF.RPT).

viii. SHIP Output File: RANOPO.BAS (This file represents the SHIP output for SHIP for Case #3. This file contains information on names of all input files, information of all input files, and information on core damage frequency (overall and individual sequences), plant median capacity, and high confidence of a low probability of failure HCLPF] information). [See page 48 for details]

Results for SHIP Evaluation #3 SCDF (using USGS data) = 2.33E-05/year Median Capacity (using USGS data) = 0.56g HCLPF (using USGS data)= 0.32g Page 9 of 102

S.'Entergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation #4 Predict the change in SCDF based on revised SPRA model and use of the 2008 USGS hazard curves. The revised SPRA model reflect realistic changes in systems, structures, and components seismic capacity, random failure rates, success criteria, and operator actions. This removes some inherent conservatism from the IPEEE SPRA model (for example low seismic fragilities and outdated plant failure data).

List of SHIP input files:

i. Names File: PILCDF2.NAM (This file lists the names of all other data files to be used by SHIP for Case #4). [see page 49 for details]

ii. Basic Input File: PILCDF2.GEN (This file contains basic parameters relevant to the SHIP Case #4 application). [see page 49 for details]

iii. Basic Event Data File: PILCDF2.CMP (This file contains data pertaining to seismic fragilities, random failures, and operator actions for SHIP for Case #4). This file contains the revise data on plant components seismic fragilities, updated random failure rate, less conservative operator actions failure probability to align suppression pool cooling, and current system success criteria on quad rooms cooling. [see page 50 for details]

iv. System Data File: PILCDF2.SYS (This file contains a list of systems to be analyzed for SHIP for Case #4. Note that the cutsets for each system will be read from separate files) [see page 56 for details]

v. Sequence Data File: PILCDF2.SEQ (This file contains data regarding sequences and plant damage states for SHIP for Case #4). [See page 56 for details]

vi. Hazard Data File: PILCDF2.HAZ (This file contains data related to the IPEEE EPRI seismic hazard for the Pilgrim site for SHIP for Case #4). [see page 56 for details]

vii. Cutset File: LMCDF.RPT (This file contains the cutsets for the systems to be analyzed for SHIP for Case #4. Note that for Pilgrim SPRA, the CDFALL system is the only system to be analyzed. These cutsets are contained in LMCDF.RPT).

viii. SHIP Output File: SCDF2.BAS (This file represents the SHIP output for SHIP for Case #4. This file contains information on names of all input files, information of all input files, and information on core damage frequency (overall and individual sequences), plant median capacity, and high confidence of a low probability of failure HCLPF] information). [See page 57 for details]

Page 10 of 102

ENG REPORT PNPS-RPT-1 1-00001

!%-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency Results for SHIP Evaluation #4 SCDF (using USGS data) = 2.14E-05/year Median Capacity (using USGS data)= 0.57g HCLPF (using USGS data)= 0.33g Page 11 of 102

A E tENG REPORT PNPS-RPT-1 1-00001 z-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation #5 Determine SCDF contribution for seismic only components based on the revised SPRA model and use of USGS hazard curves. The revised SPRA model reflect realistic changes in systems, structures, and components seismic capacity, random failure rates, success criteria, and operator actions. This removes some inherent conservatism from the IPEEE SPRA model (for example low seismic fragilities and outdated plant failure data).

List of SHIP input files:

i. Names File: PILRUN1.NAM (This file lists the names of all other data files to be used by SHIP for Case #5). [see page 58 for details]

ii. Basic Input File: PILRUN1.GEN (This file contains basic parameters relevant to the SHIP Case #5 application). [see page 58 for details]

iii. Basic Event Data File: PILRUNI.CNP (This file contains data pertaining to seismic fragilities, random failures, and operator actions for SHIP for Case #5). This file contains the revise data on plant components seismic fragilities, updated random failure rate, less conservative operator actions failure probability to align suppression pool cooling, and current system success criteria on quad rooms cooling. [see page 59 for details]

iv. System Data File: PILRUN1.SYS (This file contains a list of systems to be analyzed for SHIP for Case #5. Note that the cutsets for each system will be read from separate files) [see page 65 for details]

v. Sequence Data File: PILRUN1.SEQ (This file contains data regarding sequences and plant damage states for SHIP for Case #5). [See page 65 for details]

vi. Hazard Data File: PILRUN1.HAZ (This file contains data related to the IPEEE EPRI seismic hazard for the Pilgrim site for SHIP for Case #5). [see page 65 for details]

vii. Cutset File: LMCDF.RPT (This file contains the cutsets for the systems to be analyzed for SHIP for Case #5. Note that for Pilgrim SPRA, the CDFALL system is the only system to be analyzed. These cutsets are contained in LMCDF.RPT).

viii. SHIP Output File: RANOPO.BAS (This file represents the SHIP output for SHIP for Case #5. This file contains information on names of all input files, information of all input files, and information on core damage frequency (overall and individual sequences), plant median capacity, and high confidence of a low probability of failure HCLPF] information). [See page 66 for details]

Page 12 of 102

1"Entergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Results for SHIP Evaluation #5 SCDF (using USGS data) = 1.20E-05/year Median Capacity (using USGS data) = 0.69g HCLPF (using USGS data)= 0.38g Page 13 of 102

9%E e ENG REPORT PN PS-RPT-11-00001

~Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation #6 Predict the change in SCDF based on the original IPEEE SPRA model and use of the updated EPRI hazard curves. This provides some perspective regarding the impact of the updated EPRI hazards curves versus the IPEEE EPRI hazard curves and the 2008 USGS hazard curves.

List of SHIP input files:

i. Names File: PILEPRII.NAM (This file lists the names of all other data files to be used by SHIP for Case #6). [see page 67 for details]

ii. Basic Input File: PILEPRI 1.GEN (This file contains basic parameters relevant to the SHIP Case #6 application). [see page 67 for details]

iii. Basic Event Data File: PILEPRI I.CMP (This file contains data pertaining to seismic fragilities, random failures, and operator actions for SHIP for Case #6). This file contains the revise data on plant components seismic fragilities, updated random failure rate, less conservative operator actions failure probability to align suppression pool cooling, and current system success criteria on quad rooms cooling. [see page 68 for details]

iv. System Data File: PILEPRII.SYS (This file contains a list of systems to be analyzed for SHIP for Case #6. Note that the cutsets for each system will be read from separate files) [see page 74 for details]

v. Sequence Data File: PILRUN1.SEQ (This file contains data regarding sequences and plant damage states for SHIP for Case #6). [See page 74 for details]

vi. Hazard Data File: PILRUN1 .HAZ (This file contains data related to the IPEEE EPRI seismic hazard for the Pilgrim site for SHIP for Case #6). [see page 74 for details]

vii. Cutset File: LMCDF.RPT (This file contains the cutsets for the systems to be analyzed for SHIP for Case #6. Note that for Pilgrim SPRA, the CDFALL system is the only system to be analyzed. These cutsets are contained in LMCDF.RPT).

viii. SHIP Output File: EPRICDF1.BAS (This file represents the SHIP output for SHIP for Case #6. This file contains information on names of all input files, information of all input files, and information on core damage frequency (overall and individual sequences), plant median capacity, and high confidence of a low probability of failure HCLPF] information). [See page 75 for details]

Page 14 of 102

ENG REPORT PNPS-RPT-1I -00001 ct-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency Results for SHIP Evaluation #6 SCDF (using updated EPRI data) = 2.1 5E-05/year Median Capacity (using updated EPRI data) 0.49g HCLPF (using updated EPRI data) 0.25g Page 15 of 102

AENG REPORT PNPS-RPT-I 1-00001

=t-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation #7 Determine SCDF contribution for seismic only components based on the original IPEEE SPRA model and use of the updated EPRI hazard curves.

List of SHIP input files:

i. Names File: PILEPRI2.NAM (This file lists the names of all other data files to be used by SHIP for Case #7). [see page 76 for details]

ii. Basic Input File: PILEPRI2.GEN (This file contains basic parameters relevant to the SHIP Case #7 application). [see page 76 for details]

iii. Basic Event Data File: PILEPRI2.CMP (This file contains data pertaining to seismic fragilities, random failures, and operator actions for SHIP for Case #7). This file contains the revise data on plant components seismic fragilities, updated random failure rate, less conservative operator actions failure probability to align suppression pool cooling, and current system success criteria on quad rooms cooling. [see page 77 for details]

iv. System Data File: PILEPRI2.SYS (This file contains a list of systems to be analyzed for SHIP for Case #7. Note that the cutsets for each system will be read from separate files) [see page 83 for details]

v. Sequence Data File: PILRUN2.SEQ (This file contains data regarding sequences and plant damage states for SHIP for Case #7). [See page 83 for details]

vi. Hazard Data File: PILRUN2.HAZ (This file contains data related to the IPEEE EPRI seismic hazard for the Pilgrim site for SHIP for Case #7). [see page 83 for details]

vii. Cutset File: LMCDF.RPT (This file contains the cutsets for the systems to be analyzed for SHIP for Case #7. Note that for Pilgrim SPRA, the CDFALL system is the only system to be analyzed. These cutsets are contained in LMCDF.RPT).

viii. SHIP Output File: EPRICDF2.BAS (This file represents the SHIP output for SHIP for Case #7. This file contains information on names of all input files, information of all input files, and information on core damage frequency (overall and individual sequences), plant median capacity, and high confidence of a low probability of failure HCLPF] information). [See page 84 for details]

Page 16 of 102

9%Entergy ENG REPORT PNPS-RPT-I 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Results for SHIP Evaluation #7 SCDF (using updated EPRI data)= 1.56E-05/year Median Capacity (using updated EPRI data)= 0.57g HCLPF (using updated EPRI data)= 0.32g Page 17 of 102

--'Entey ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation #8 Predict the change in SCDF based on the revised SPRA model (as described in item #1 on page 3 of this attachment) and use of the updated EPRI hazard curves.

List of SHIP input files:

i. Names File: PILCDF1.NAM (This file lists the names of all other data files to be used by SHIP for Case #8). [see page 85 for details]

ii. Basic Input File: PILCDF1.GEN (This file contains basic parameters relevant to the SHIP Case #8 application). [see page 85 for details]

iii. Basic Event Data File: PILCDFI.CMP (This file contains data pertaining to seismic fragilities, random failures, and operator actions for SHIP for Case #8). This file contains the revise data on plant components seismic fragilities, updated random failure rate, less conservative operator actions failure probability to align suppression pool cooling, and current system success criteria on quad rooms cooling. [see page 86 for details]

iv. System Data File: PILCDF1.SYS (This file contains a list of systems to be analyzed for SHIP for Case #8. Note that the cutsets for each system will be read from separate files) [see page 92 for details]

v. Sequence Data File: PILCDFI.SEQ (This file contains data regarding sequences and plant damage states for SHIP for Case #8). [See page 92 for details]

vi. Hazard Data File: PILCDFI.HAZ (This file contains data related to the IPEEE EPRI seismic hazard for the Pilgrim site for SHIP for Case #8). [see page 92 for details]

vii. Cutset File: LMCDF.RPT (This file contains the cutsets for the systems to be analyzed for SHIP for Case #8. Note that for Pilgrim SPRA, the CDFALL system is the only system to be analyzed. These cutsets are contained in LMCDF.RPT).

viii. SHIP Output File: SCDFI .BAS (This file represents the SHIP output for SHIP for Case #8. This file contains information on names of all input files, information of all input files, and information on core damage frequency (overall and individual sequences), plant median capacity, and high confidence of a low probability of failure HCLPF] information). [See page 93 for details]

Page 18 of 102

"ýEntergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Results for SHIP Evaluation #8 SCDF (using updated EPPR data) = 1.44E-05/year Median Capacity (using updated EPRI data) = 0.57g HCLPF (using updated EPRI data) = 0.33g Page 19 of 102

S"EntergyENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation #9 Determine SCDF contribution for seismic only components based on the revised SPRA model (as described in item #1 on page 3 of this attachment) and use of the updated EPRI hazard curves.

List of SHIP input files:

i. Names File: PILEPRI I.NAM (This file lists the names of all other data files to be used by SHIP for Case #9). [see page 94 for details]

ii. Basic Input File: PILEPRI 1.GEN (This file contains basic parameters relevant to the SHIP Case #9 application). [see page 94 for details]

iii. Basic Event Data File: PILEPRI1.CMP (This file contains data pertaining to seismic fragilities, random failures, and operator actions for SHIP for Case #9). This file contains the revise data on plant components seismic fragilities, updated random failure rate, less conservative operator actions failure probability to align suppression pool cooling, and current system success criteria on quad rooms cooling. [see page 95 for details]

iv. System Data File: PILEPRI I.SYS (This file contains a list of systems to be analyzed for SHIP for Case #9. Note that the cutsets for each system will be read from separate files) [see page 101 for details]

v. Sequence Data File: PILEPRI 1.SEQ (This file contains data regarding sequences and plant damage states for SHIP for Case #9). [See page 101 for details]

vi. Hazard Data File: PILEPRI 1.HAZ (This file contains data related to the IPEEE EPRI seismic hazard for the Pilgrim site for SHIP for Case #9). [see page 101 for details]

vii. Cutset File: LMCDF.RPT (This file contains the cutsets for the systems to be analyzed for SHIP for Case #9. Note that for Pilgrim SPRA, the CDFALL system is the only system to be analyzed. These cutsets are contained in LMCDF.RPT).

viii. SHIP Output File: RANOPO.BAS (This file represents the SHIP output for SHIP for Case #9. This file contains information on names of all input files, information of all input files, and information on core damage frequency (overall and individual sequences), plant median capacity, and high confidence of a low probability of failure HCLPF] information). [See page 102 for details]

Page 20 of 102

PNPS-RPT-1 1-00001

!!-Entergy ENG REPORT Re-assessment of Pilgrim Seismic Core Damage Frequency Results for SHIP Evaluation #9 SCDF (using updated EPRI data) = 8.87E-06/year Median Capacity (using updated EPRI data) = 0.69g HCLPF (using updated EPRI data)= 0.38g Page 21 of 102

PNPS-RPT-11-00001 cz-Entergy ENG REPORT Re-assessment of Pilgrim Seismic Core Damage Frequency List of SHIP Input Files SHIP Evaluation #1 Names File for PILCDFI.NAM PILCDF 1.GEN PILCDFI .SYS PILCDF1 .CMP PILCDF 1.SEQ PIL.HAZ PILCDF1.NAM 05-19-11 Basic Input File for PILCDF1.GEN Pilgrim SPRA Entergy Nuclear FRAG&BE Data (EPRI)

SCDFI 1 1 2 1 1 1 1 1 1 1 129 7 122 1 2 1 nsupcmp,ncomps,ncmpnln,nr,nsys,nseq,ndmg PGA (g) 1 .04 .01 0.98 1290 2

PILCDFI .GEN 05-19-11 Page 22 of 102

A.' Entergy ENG REPORT PN PS-RPT-I 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Basic Event Data File for PILCDFI.CMP ESISLXXXLXZ SISL EBAAXXXXXZ 2.11 0.46 0 0 EBABD3XXXZ 2.28 0.46 0 0 EBCDI145XZ 2.11 0.46 0 0 EBCD I2-13Z 2.28 0.46 0 0 EBDDGBLDXZ 1.04 0.46 0 0 EBSA5XXXXZ 1.76 0.46 0 0 EBSA600XXZ 2.09 0.46 0 0 EBSA6XXXXZ 2.09 0.46 0 0 EBSA8XXXXZ 0.96 0.29 0.37 0 EBSB1OXXXZ 2.24 0.46 0 0 EBSB 1415XZ 1.51 0.46 0 0 EBSB I718XZ 2 0.46 0 0 EBSBIXXXXZ 2 0.46 0 0 EBSB2XXXXZ 1.13 0.46 0 0 EBSB6XXXXZ 2 0.46 0 0 EBSD16XXXZ 2.11 0.46 0 0 EBSD17XXXZ 2.28 0.46 0 0 EBSD4XXXXZ 2.11 0.46 0 0 EBSD5XXXXZ 2.28 0.46 0 0 EBSD7XXXXZ 2 0.46 0 0 EBSY34XXXZ 1.49 0.46 0 0 EBW 185/1XZ 1.41 0.46 0 0 EBW195/23Z 2 0.46 0 0 EBW I98/OXZ 2.29 0.46 0 0 EBW198/IXZ 3.43 0.33 0.72 0 EBW 198/2XZ 3.43 0.33 0.72 0 EBW198/3XZ 2.29 0.46 0 0 EBW209/OXZ 2 0.46 0 0 EBW209/I XZ 1.72 0.46 0 0 EBW210/OXZ 1.65 0.34 0.46 0 EBW210/IXZ 1.84 0.46 0 0 EBW210/3XZ 2 0.46 0 0 EBW45/3XXZ 2 0.46 0 0 ECBD29XXXZ 2.23 0.46 0 0 ECBD30-31Z 2.28 0.46 0 0 ECMK 103ABZ 1.73 0.46 0 0 ECONTLRODZ 1.55 0.46 0 0 ECOREPLATZ 2.9 0.46 0 0 EDLGEABXXZ 1.39 0.32 0.57 0 EDLGESBOXZ 2 0.46 0 0 EDP2233ABZ 1.49 0.46 0 0 EDPC2258XZ 2.13 0.46 0 0 EDPC5XXXXZ 2.11 0.46 0 0 Page 23 of 102

a -ENG REPORT PNPS-RPT-1 1-00001

!ýLEntergy Re-assessment of Pilgrim Seismic Core Damage Frequency EDPC6XXXXZ 2.11 0.46 0 0 EDPC93023Z 2.28 0.46 0 0 EDPC93912Z 2.28 0.46 0 0 EDRYWSUPPZ 2.62 0.46 0 0 EDWSHIELDZ 2.04 0.46 0 0 EFN201ABXZ 2 0.46 0 0 EFN202ABXZ 2 0.46 0 0 EFN203ABXZ 2 0.46 0 0 EFN204ABXZ 2 0.46 0 0 EFN204CDXZ 2 0.46 0 0 EFN207A-DZ 2 0.46 0 0 EFNDWCOOLZ 1.06 0.46 0 0 EFUAXXXXXZ 2.23 0.46 0 0 EFUBXXXXXZ 2.5 0.46 0 0 EFUD3XXXXZ 2.28 0.46 0 0

-EFUELCHANZ 3.96 0.46 0 0 EINCORHOUZ 2.75 0.46 0 0 EINTKPANLZ 4.54 0.46 0 0 EISLOCACSZ 0 0.46 0 0 EISLOCRHRZ 0 0.46 0 0 ELOCAHPCIZ 2.5 0.46 0 0 ELOCARCICZ 2.5 0.46 0 0 EPM141ABXZ 1.73 0.46 0 0 EPM184AXXZ 1.42 0.46 0 0 EPM202A-FZ 2.13 0.46 0 0 EPM203A-DZ 2.33 0.46 0 0 EPM208A-EZ 2.32 0.46 0 0 EPTHPCIXXZ 2.33 0.46 0 0 EPTRCICXXZ 2.33 0.46 0 0 ERBTRKLOKZ 3.55 0.46 0 0 ERE12759!Z 0.89 0.31 0.51 0 ERE 12769!Z 1.04 0.31 0.51 0 ERE132X9!Z 1.5 0.31 0.51 0 ERE1425B!Z 1.14 0.31 0.51 0 ERE15159!Z 0.89 0.31 0.51 0 ERE15169!Z 1.04 0.31 0.51 0 ERE159X9!Z 2.22 0.31 0.51 0 ERE 16059!Z 0.89 0.31 0.51 0 ERE 16069!Z 1.04 0.31 0.51 0 ERE18159!Z 0.89 0.31 0.51 0 EREI8169!Z 1.04 0.31 0.51 0 ERE1865X!Z 0.73 0.31 0.51 0 ERE18681!Z 1.34 0.31 0.51 0 ERE18759!Z 0.89 0.31 0.51 0 EREI8769!Z 1.04 0.31 0.51 0 ERE18781!Z 0.25 0.31 0.51 0 ERE2352X!Z 1.2 0.31 0.51 0 ERE2759X!Z 1.55 0.31 0.51 0 ERE27A5X!Z 0.89 0.31 0.51 0 Page 24 of 102

A Entergy

-- ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency ERE27A6X!Z 1.04 0.31 0.51 0 ERE32801!Z 1 0.31 0.51 0 ERE40801!Z 0.67 0.31 0.51 0 ERE46801!Z 0.67 0.31 0.51 0 ERE51N81!Z 1 0.31 0.51 0 ERE51NG8!Z 1 0.31 0.51 0 ERE51V81!Z 1 0.31 0.51 0 ERE59801 !Z 1 0.31 0.51 0 ERINGGIRDZ 2.54 0.46 0 0 ERPVPEDESZ 3.27 0.46 0 0 ERPVSTABLZ 1.52 0.46 0 0 ERWCONCWLZ 1.93 0.46 0 0 ERXBLDDWLZ 3.57 0.46 0 0 ERXBLDFOUZ 1.76 0.46 0 0 ESHDSPGUSZ 2.54 0.46 0 0 ESURROGATZ 1 0.3 0 0 ETBCONCWLZ 3.89 0.46 0 0 ETK105ABNZ 5 0.46 0 0 ETKT105ABZ 1.27 0.46 0 0 ETKT124ABZ 4.81 0.65 0 0 ETKT126ABZ 1.44 0.46 0 0 ETKT201ABZ 2.1 0.46 0 0 ETOPGUIDEZ 2.56 0.46 0 0 ETVX21XXXZ 1.76 0.46 0 0 ETVX22XXXZ 2.77 0.46 0 0 ETVX55XXXZ 1.49 0.46 0 0 EUPLOFLORZ 1.4 0.46 0 0 EVA452122Z 2.9 0.46 0 0 EVESUPSKTZ 6.15 0.46 0 0 EVPEABXXXZ 1.73 0.46 0 0 EVRCABXXXZ 1.73 0.46 0 0 EVS4563ABZ 2.9 0.46 0 0 EVS4563CDZ 2.9 0.46 0 0 EVS4565CDZ 1.73 0.46 0 0 EVS4582ABZ 2.9 0.46 0 0 EVS4582CDZ 2.9 0.46 0 0 ELOSPXXXXZ 0.35 0.55 0 0 EBCDI4XXXY 1 5 0.0000 0.15 0.4999 0.5 2 1.0 2.5e-2 2.50E-02 2.50E-01 5.0E-01 5.OOE-01 EDLGESBOXY 1 5 0.0000 0.15 0.4999 0.5 2 1.0 3.2e-3 3.20E-03 3.20E-02 5.OOE-01 5.OOE-01 ELPSPPRPLY 1 5 0.0000 0.15 0.4999 0.5 2 1.0 4.0e-3 4.OOE-03 4.OOE-02 1.00E+00 1.00E+00 ESPCOOLXXY 1 5 0.0000 0.15 0.4999 0.5 2 1.0 5.1e-4 5.10E-04 5.10E-03 5.00E-02 5.OOE-02 Page 25 of 102

SEntergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency ESPC36ABXY 1 5 0.0000 0.15 0.4999 0.5 2 1.0 5.0e-I 5.OOE-01 5.OOE-01 7.50E-01 7.50E-01 ERERESET!Y 1 5 0.0000 0.15 0.4999 0.5 2 1.0 9.OE-2 9.OOE-02 5.OOE-01 5.OOE-01 5.OOE-01 EVMMO45X!Y 5 0.0000 0.15 0.4999 0.5 2 1.0 6.6E-2 6.60E-02 5.OOE-0 I 5.OOE-01 5.OOE-01 ACB152501F 1.49E-04 0.001 ACB1 52509L 1.49E-04 0.001 ACBI52601F 1.49E-04 0.001 ACB1 52609L i .49E-04 0.001 ACB152802F 1.49E-04 0.001 ACB5605CCN 2.21 E-05 0.001 ACB5609CCC 8.86E-05 0.001 ADLADL3CCR 2.64E-04 0.001 ADLADLBCCR 2.64E-04 0.001 ADLADLBCCS 4.90E-05 0.001 ADLBDL3CCR 2.64E-04 0.001 ADLG 123CCR 1.32E-05 0.001 ADLGEAXXXS 4.80E-03 0.001 ADLGEAXXXU 1.18E-02 0.001 ADLGEBXXXR 7.92E-03 0.001 ADLGEBXXXU 1.09E-02 0.001 ADLGESBOXS 4.80E-03 0.001 ADLGESBOXU 1.42E-02 0.001 ALOCALOOP 1.00E+00 0.001 APMI41AXXR 6.84E-04 0.001 APM 141BXXR 6.84E-04 0.001 APM I 84AXXR 6.84E-04 0.001 APM I 84AXXS 4.95E-04 0.001 AVA452XCCN 4.OOE-05 0.001 BPM5XXXCCS 4.80E-05 0.001 BPMBXXXXXU 1.09E-02 0.001 BPMCXXXXXU 1.09E-02 0.001 BPMEXXXXXU i .09E-02 0.001 BPMFXXXXXU 1.09E-02 0.001 BVM3801XXC 1.65E-03 0.001 BVM3805XXC 1.65E-03 0.001 CM 7.50E-06 0.001 CVC9AXXXXC 2.66E-04 0.001 CVC9BXXXXC 2.66E-04 0.001 DBC21XXCCR 1.57E-05 0.001 DBCDI INORE 6.80E-01 0.001 DBCDI IXXXU 7.30E-04 0.001 DBCD12NORE 6.80E-01 0.001 DBCD12XXXU 7.30E-04 0.001 EBCD IXXXR 2.98E-04 0.001 Page 26 of 102

do EENG REPORT PNPS-RPT-1 1-00001 ct-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency EBCDI2XXXR 2.98E-04 0.001 ECB152504F 1.49E-04 0.001 ECB152505N 1.99E-04 0.001 ECB152508L 1.49E-04 0.001 ECB 152509C 7.97E-04 0.001 ECB I 52600L 1.49E-04 0.001 ECB 152604F 1.49E-04 0.001 ECB I 52605N 1.99E-04 0.001 ECB152608L 1.49E-04 0.001 ECB 152609C 7.97E-04 0.001 ECB 152801C 1.99E-04 0.001 ECB1!52802N 1.99E-04 0.001 ECB5605AXY 1.00E+00 0.001 ECB5605DXY 1.00E+00 0.001 EDLGEAXXXR 7.92E-03 0.001 EDLGEBXXXS 4.80E-03 0.001 EDLGESBOXR 7.92E-03 0.001 EHX209AXXU 2.66E-02 0.001 EHX209BXXU 2.66E-02 0.001 ELOCAHPCIR 1.23E-04 0.001 ELOCARCICR 1.23E-04 0.001 EPMI41AXXS 4.95E-04 0.001 EPMI41BXXS 4.95E-04 0.001 EPM208AXXS 9.20E-03 0.001 EPM208BXXS 9.20E-03 0.001 EPM208EXXS 9.20E-03 0.001 EPTHPCIXXR 3.93E-03 0.001 EPTRCICXXR 9.78E-03 0.001 EVA4521XXN 1.60E-04 0.001 EVA4522XXN 1.60E-04 0.001 EVMI30117C 1.65E-03 0.001 EVM23015XC 1.65E-03 0.001 HPMAUXOILS 3.33E-03 0.001 HPME205XXS 3.OOE-03 0.001 HPTHPCIXXS 3.33E-03 0.001 HPTHPRCCCR 2.31E-07 0.001 HPTHfPRCCCS 3.46E-05 0.001 HSYHPCIMNU 1.21E-02 0.001 HVMMO35XXN 1.65E-03 0.001 HVMMO36XXN 1.65E-03 0.001 HVMMO3XXXN 1.03E-03 0.001 HVMMO6XXXC 1.65E-03 0.001 HVMMO8XXXN 1.65E-03 0.001 ILPRCICMNU 8.74E-03 0.001 IPTRCICXXS 3.33E-03 0.001 IPVVACPMPS 3.OOE-03 0.001 IVMINJVCCN 1.30E-04 0.001 IVMMO49XXN 1.50E-03 0.001 IVMMO6OXXC 1.65E-03 0.001 Page 27 of 102

E tgENG REPORT PN PS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency IVMMO61XXN 1.50E-03 0.001 IVMMO62XXN 1.65E-03 0.001 P 6.80E-03 0.001 R[XE207AXU 5.OOE-04 0.001 RH-XE207BXU 5.OOE-04 0.001 RLPSPCOLAU 3.OOE-03 0.001 RLPSPCOLBU 3.OOE-03 0.001 RPMABCDCCS 1.70E-05 0.001 RVC68AXXXC 2.66E-04 0.001 RVC68BXXXC 2.66E-04 0.00 1 RVMIOABCCN 1.30E-04 0.001 RVM3436CCN 1.30E-05 0.001 RVM34ABCCN 3.70E-05 0.001 RVM34AXXXN 1.50E-03 0.001 RVM34BXXXN 1.50E-03 0.001 RVM36ABCCN 3.70E-05 0.001 RVM36AXXXN 1.50E-03 0.001 RVM36BXXXN 1.50E-03 0.001 RVM4A6BCCN 3.70E-05 0.001 RVM4B6ACCN 3.70E-05 0.001 RVM60ABCCN 1.30E-04 0.001 SPMABXXCCS. 2.60E-04 0.001 SPMALLXCCS 1.63E-05 0.001 SPMP208BXU 2.98E-02 0.001 SPMP208EXU 2.98E-02 0.001 SVC3880BXN 1.57E-03 0.001 SVC3880EXN 1.57E-03 0.001 ETRANSFLAG 1.00E+00 0.001 RVM29AXXXL 1.20E-05 0.001 RVM29BXXXL 1.20E-05 0.001 EVM25BXXXL 1.20E-05 0.001 CVM25AXXXL 1.20E-05 0.001 JAF-INSERT 4.65E-03 0.001 Page 28 of 102

PNPS-RPT-11-00001

'c-Entergy ENG REPORT Re-assessment of Pilgrim Seismic Core Damage Frequency System Data File for PILCDF1.SYS 1 1 CDFALL LMCDF Seouence Data File: PILCDF1.SEO PIL-SEQI PIL-SEQI 11 1 ESURROGATZ PIL-SEQ2 F?IL-SEQ2 1 1 3

\ESURROGATZ ELOSPXXXXZ CDFALL ALL I Hazard Data File: PILCDF1.HAZ

                  • Pilgrim Hazard Curves********* ...HAZHEAD (A40) 1 ...NHAZ 7 ...NPHAZ 1.0 ...PWHAZ(I)

.009174 .09684 .1937 .3914 .5810 .7543 .9888 ACC 1.3e-02 1.4e-03 5.3e-04 9.6e-05 2.0e-05 5.7e-06 1.5e-06 HAZ Page 29 of 102

"Entergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Page 17 SCDF1.BAS SHIP Basic Output No. Damage State Damage State No-of Contributing Sequence Risks Name Risk Sequences (in decreasing order of importance.)

I ALL 2.85E-05 2 No. Sequence Name Sequence Risk %of Total 1 PIL-SEQ2 2.57E-05 90.21 2 PIL-SEQI 2.79E-06 9.79 Sum: 2.85E-05 100.00 Page 18 SCDF 1.BAS SHIP Basic Output Summary of Plant Level Fragility Conditional Probability of Failure PGA (g)

.050 .401

.150 .470

.250 .495

.500 .572

.750 .685

.850 .754

.950 .889 HCLPF (See note) .326 Note: Best Estimate Case HCLPF HCLPF = Ground motion level for which there is a high confidence of a low probability of failure

= Amed

  • exp( -2.3
  • Beta )

(Assuming the plant fragility is Lognormally distributed, the HCLPF corresponds to a 1.072%

probability of failure)

Page 30 of 102

S.,Entey ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation #2 Names File for PILUSGS.NAM PILUSGS.GEN PILUSGS.SYS PILUSGS.CMP PILUSGS.SEQ PILUSGS.HAZ PILUSGS.NAM 05-18-11 Basic Input File for PILUSGS.GEN Pilgrim SPRA Entergy Nuclear USGS Base Case CDF USGSCDF 1 1 2 1 1 1 1 1 1 1 1 129 7 122 1 2 1 nsupcmp,ncomps,ncmpnln,nr,nsys,nseq,ndmg PGA (g) 1 .04 .02 0.98 1290 2

PILUSGS.GEN 05-18-11 Page 31 of 102

90 EnteW ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Basic Event Data File for PILUSGS.CMP ESISLXXXXZ SISL EBAAXXXXXZ 2.11 0.46 0 0 EBABD3XXXZ 2.28 0.46 0 0 EBCD1145XZ 2.11 0.46 0 0 EBCD12-13Z 2.28 0.46 0 0 EBDDGBLDXZ 0.77 0.46 0 0 EBSA5XXXXZ 1.76 0.46 0 0 EBSA600XXZ 2.09 0.46 0 0 EBSA6XXXXZ 2.09 0.46 0 0 EBSA8XXXXZ 0.96 0.29 0.37 0 EBSB1OXXXZ 2.24 0.46 0 0 EBSB1415XZ 1.51 0.46 0 0 EBSB 1718XZ 2 0.46 0 0 EBSB1XXXXZ 2 0.46 0 0 EBSB2XXXXZ 0.84 0.46 0 0 EBSB6XXXXZ 2 0.46 0 0 EBSDi6XXXZ 2.11 0.46 0 0 EBSD17XXXZ 2.28 0.46 0 0 EBSD4XXXXZ 2.11 0.46 0 0 EBSD5XXXXZ 2.28 0.46 0 0 EBSD7XXXXZ 2 0.46 0 0 EBSY34XXXZ 1.49 0.46 0 0 EBW185/IXZ 1.41 0.46 0 0 EBW195/23Z 1 0.46 0 0 EBW 198/OXZ 2.29 0.46 0 0 EBW 198/1XZ 3.43 0.33 0.72 0 EBW198/2XZ 3.43 0.33 0.72 0 EBW198/3XZ 2.29 0.46 0 0 EBW209/OXZ 0.82 0.46 0 0 EBW209/1XZ 1.72 0.46 0 0 EBW210/OXZ 1.65 0.34 0.46 0 EBW210/IXZ 1.84 0.46 0 0 EBW210/3XZ 2 0.46 0 0 EBW45/3XXZ 1.07 0.46 0 0 ECBD29XXXZ 2.23 0.46 0 0 ECBD30-31Z 2.28 0.46 0 0 ECMK103ABZ 1.28 0.46 0 0 ECONTLRODZ 1.55 0.46 0 0 ECOREPLATZ 2.9 0.46 0 0 EDLGEABXXZ 1.39 0.32 0.57 0 EDLGESBOXZ 2 0.46 0 0 EDP2233ABZ 1.49 0.46 0 0 EDPC2258XZ 2.13 0.46 0 0 EDPC5XXXXZ 2.11 0.46 0 0 Page 32 of 102

do Entergy ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency EDPC6XXXXZ 2.11 0.46 0 0 EDPC93023Z 2.28 0.46 0 0 EDPC93912Z 2.28 0.46 0 0 EDRYWSUPPZ 2.62 0.46 0 0 EDWSHIELDZ 2.04 0.46 0 0 EFN201ABXZ 1.23 0.46 0 0 EFN202ABXZ 1.23 0.46 0 0 EFN203ABXZ 1.23 0.46 0 0 EFN204ABXZ 0.61 0.46 0 0 EFN204CDXZ 0.61 0.46 0 0 EFN207A-DZ 1.01 0.46 0 0 EFNDWCOOLZ 1.06 0.46 0 0 EFUAXXXXXZ 2.23 0.46 0 0 EFUBXXXXXZ 2.5 0.46 0 0 EFUD3XXXXZ 2.28 0.46 0 0 EFUELCHANZ 3.96 0.46 0 0 EINCORHOUZ 2.75 0.46 0 0 EINTKPANLZ 4.54 0.46 0 0 EISLOCACSZ 0 0.46 0 0 EISLOCRHRZ 0 0.46 0 0 ELOCAHPCIZ 2.5 0.46 0 0 ELOCARCICZ 2.5 0.46 0 0 EPM 141ABXZ 1.28 0.46 0 0 EPM I84AXXZ 1.05 0.46 0 0 EPM202A-FZ 2.13 0.46 0 0 EPM203A-DZ 2.33 0.46 0 0 EPM208A-EZ 2.32 0.46 0 0 EPTHPCIXXZ 2.33 0.46 0 0 EPTRCICXXZ 2.33 0.46 0 0 ERBTRKLOKZ 3.55 0.46 0 0 ERE12759!Z 0.89 0.31 0.51 0 ERE12769!Z 1.04 0.31 0.51 0 ERE132X9!Z 0.55 0.31 0.51 0 EREI425B!Z 1.14 0.31 0.51 0 ERE 15159!Z 0.89 0.31 0.51 0 ERE 15 169!Z 1.04 0.31 0.51 0 ERE159X9!Z 0.55 0.31 0.51 0 ERE 16059!Z 0.89 0.31 0.51 0 ERE 16069!Z 1.04 0.31 0.51 0 EREI8159!Z 0.89 0.31 0.51 0 EREI8169!Z 1.04 0.31 0.51 0 ERE1865X!Z 0.73 0.31 0.51 0 ERE18681!Z 1.34 0.31 0.51 0 ERE18759!Z 0.89 0.31 0.51 0 ERE18769!Z 1.04 0.31 0.51 0 EREI8781!Z 0.25 0.31 0.51 0 ERE2352X!Z 1.2 0.31 0.51 0 ERE2759X!Z 1.55 0.31 0.51 0 ERE27A5X!Z 0.89 0.31 0.51 0 Page 33 of 102

a Entergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency ERE27A6X!Z 1.04 0.31 0.51 0 ERE32801 !Z 1 0.31 0.51 0 ERE40801!Z 0.67 0.31 0.51 0 ERE46801!Z 0.67 0.31 0.51 0 ERE5IN8l!Z 1 0.31 0.51 0 ERE51NG8!Z 1 0.31 0.51 0 ERE51V81!Z 1 0.31 0.51 0 ERE59801 !Z 1 0.31 0.51 0 ERINGGIRDZ 2.54 0.46 0 0 ERPVPEDESZ 3.27 0.46 0 0 ERPVSTABLZ 1.52 0.46 0 0 ERWCONCWLZ 1.93 0.46 0 0 ERXBLDDWLZ 3.57 0.46 0 0 ERXBLDFOUZ 1.76 0.46 0 0 ESHDSPGUSZ 2.54 0.46 0 0 ESURROGATZ 1 0.3 0 0 ETBCONCWLZ 3.89 0.46 0 0 ETK 105ABNZ 0.16 0.46 0 0 ETKT105ABZ 0.94 0.46 0 0 ETKT124ABZ 4.81 0.65 0 0 ETKT126ABZ 1.44 0.46 0 0 ETKT201ABZ 2.1 0.46 0 0 ETOPGUIDEZ 2.56 0.46 0 0 ETVX21XXXZ 1.76 0.46 0 0 ETVX22XXXZ 2.77 0.46 0 0 ETVX55XXXZ 1.49 0.46 0 0 EUPLOFLORZ 1.4 0.46 0 0 EVA452122Z 2.9 0.46 0 0 EVESUPSKTZ 6.15 0.46 0 0 EVPEABXXXZ 1.28 0.46 0 0 EVRCABXXXZ 1.28 0.46 0 0 EVS4563ABZ 2.9 0.46 0 0 EVS4563CDZ 2.9 0.46 0 0 EVS4565CDZ 1.28 0.46 0 0 EVS4582ABZ 2.9 0.46 0 0 EVS4582CDZ 2.9 0.46 0 0 ELOSPXXXXZ 0.35 0.55 0 0 EBCD14XXXY 1 5 0.0000 0.15 0.4999 0.5 2 1.0 2.5e-2 2.50E-02 2.50E-01 5.OOE-01 5.OOE-01 EDLGESBOXY 1 5 0.0000 0.15 0.4999 0.5 2 1.0 3.2e-3 3.20E-03 3.20E-02 5.OOE-01 5.OOE-01 ELPSPPRPLY 1 5 0.0000 0.15 0.4999 0.5 2 1.0 4.0e-3 4.OOE-03 4.OOE-02 1.00E+00 1.00E+00 ESPCOOLXXY 1 5 0.0000 0.15 0.4999 0.5 2 1.0 5.1e-4 5.1OE-04 5.1OE-03 5.OOE-01 5.OOE-01 Page 34 of 102

A n ENG REPORT PNPS-RPT-I 1-00001 t-EnteWg Re-assessment of Pilgrim Seismic Core Damage Frequency ESPC36ABXY 1 5 0.0000 0.15 0.4999 0.5 2 1.0 5.0e-I 5.OOE-01 5.00E-01 7.50E-01 7.50E-01 ERERESET!Y 1 5 0.0000 0.15 0.4999 0.5 2 1.0 9.OE-2 9.OOE-02 5.OOE-01 5.OOE-01 5.OOE-01 EVMMO45X!Y 1 5 0.0000 0.15 0.4999 0.5 2 1.0 6.6E-2 6.60E-02 5.OOE-01 5.OOE-01 5.OOE-01 ACB152501F 1.49E-04 0.001 ACB152509L 1.49E-04 0.001 ACB152601F 1.49E-04 0.001 ACB152609L 1.49E-04 0.001 ACB152802F 1.49E-04 0.001 ACB5605CCN 2.21E-05 0.001 ACB5609CCC 8.86E-05 0.001 ADLADL3CCR 2.64E-04 0.001 ADLADLBCCR 2.64E-04 0.00!

ADLADLBCCS 4.90E-05 0.001 ADLBDL3CCR 2.64E-04 0.00 1 ADLGI23CCR 1.32E-05 0.001 ADLGEAXXXS 4.80E-03 0.001 ADLGEAXXXU 1.18E-02 0.001 ADLGEBXXXR 7.92E-03 0.001 ADLGEBXXXU 1.18E-02 0.001 ADLGESBOXS 4.80E-03 0.001 ADLGESBOXU 1.14E-02 0.001 ALOCALOOP 1.00E+00 0.001 APMI41AXXR 6.84E-04 0.001 APM141BXXR 6.84E-04 0.001 APMI84AXXR 6.84E-04 0.001 APM184AXXS 4.95E-04 0.001 AVA452XCCN 4.OOE-05 0.001 BPM5XXXCCS 4.80E-05 0.001 BPMBXXXXXU 1.09E-02 0.001 BPMCXXXXXU 1.09E-02 0.001 BPMEXXXXXU 1.09E-02 0.001 BPMFXXXXXU 1.09E-02 0.001 BVM3801XXC 1.65E-03 0.001 BVM3805XXC 1.65E-03 0.001 CM 7.50E-06 0.001 CVC9AXXXXC 2.66E-04 0.001 CVC9BXXXXC 2.66E-04 0.001 DBC21XXCCR 1.57E-05 0.001 DBCD IINORE 6.80E-01 0.001 DBCDI 1XXXU 7.30E-04 0.001 DBCDi2NORE 6.80E-01 0.001 DBCD12XXXU 7.30E-04 0.001 EBCDIIXXXR 2.98E-04 0.001 Page 35 of 102

'Entergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency EBCDI2XXXR 2.98E-04 0.001 ECB152504F 1.49E-04 0.001 ECB 152505N 1.99E-04 0.001 ECB152508L 1.49E-04 0.001 ECB152509C 7.97E-04 0.001 ECB152600L 1.49E-04 0.001 ECB152604F 1.49E-04 0.001 ECB152605N 1.99E-04 0.001 ECB152608L 1.49E-04 0.001 ECB152609C 7.97E-04 0.001 ECB15280!C 1.99E-04 0.001 ECB152802N 1.99E-04 0.001 ECB5605AXY 1.00E+00 0.001 ECB5605DXY 1.00E+00 0.001 EDLGEAXXXR 7.92E-03 0.001 EDLGEBXXXS 4.80E-03 0.001 EDLGESBOXR 7.92E-03 0.001 EHX209AXXU 2.66E-02 0.001 EHX209BXXU 2.66E-02 0.001 ELOCAHPCIR 1.23E-04 0.001 ELOCARCICR 1.23E-04 0.001 EPM141AXXS 4.95E-04 0.001 EPMI41BXXS 4.95E-04 0.001 EPM208AXXS 9.20E-03 0.001 EPM208BXXS 9.20E-03 0.001 EPM208EXXS 9.20E-03 0.001 EPTHPCIXXR 1.96E-02 0.001 EPTRCICXXR 1.96E-02 0.001 EVA4521XXN 1.60E-04 0.001 EVA4522XXN 1.60E-04 0.001 EVM130117C 1.65E-03 0.001 EVM23015XC 1.65E-03 0.001 HPMAUXOILS 3.OOE-03 0.001 HPME205XXS 3.OOE-03 0.001 HPTHPCIXXS 6.11E-03 0.001 HPTHPRCCCR 3.56E-04 0.001 HPTHPRCCCS 3.90E-04 0.001 HSYHPCIMNU 2.54E-02 0.001 HVMMO35XXN 1.65E-03 0.001 HVMMO36XXN 1.65E-03 0.001 80 HVMMO3XXXN 1.30E-02 0.001 HVMMO6XXXC 1.65E-03 0.001 HVMMO8XXXN 1.65E-03 0.001 ILPRCICMNU 3.55E-02 0.001 IPTRCICXXS 3.33E-02 0.001 IPVVACPMPS 3.OOE-03 0.001 IVMINJVCCN 1.30E-04 0.001 IVMMO49XXN 1.50E-03 0.001 IVMMO6OXXC 1.65E-03 0.001 Page 36 of 102

A EENG REPORT PNPS-RPT-1 1-00001

'c-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency IVMMO61XXN 1.50E-03 0.001 IVMMO62XXN 1.65E-03 0.001 P 6.80E-03 0.001 RHXE207AXU 5.OOE-04 0.001 RHXE207BXU 5.OOE-04 0.001 RLPSPCOLAU 3.OOE-03 0.001 RLPSPCOLBU 3.OOE-03 0.001 RPMABCDCCS 1.70E-05 0.001 RVC68AXXXC 2.66E-04 0.001 RVC68BXXXC 2.66E-04 0.001 RVMIOABCCN 1.30E-04 0.001 RVM3436CCN 1.30E-05 0.001 RVM34ABCCN 3.70E-05 0.001 RVM34AXXXN 1.50E-03 0.001 RVM34BXXXN 1.50E-03 0.001 RVM36ABCCN 3.70E-05 0.001 RVM36AXXXN 1.50E-03 0.001 RVM36BXXXN 1.50E-03 0.001 RVM4A6BCCN 3.70E-05 0.001 RVM4B6ACCN 3.70E-05 0.001 RVM60ABCCN 1.30E-04 0.001 SPMABXXCCS 2.60E-04 0.001 SPMALLXCCS 7.OOE-04 0.001 SPMP208BXU 2.98E-02 0.001 SPMP208EXU 2.98E-02 0.001 SVC3880BXN 1.57E-03 0.001 SVC3880EXN 1.57E-03 0.001 ETRANSFLAG 1.00E+00 0.001 RVM29AXXXL 1.20E-05 0.001 RVM29BXXXL 1.20E-05 0.001 EVM25BXXXL 1.20E-05 0.001 CVM25AXXXL 1.20E-05 0.001 JAF-INSERT 4.65E-03 0.001 PILRUNI .CMP 5/18/2011 Page 37 of 102

mf

!'-Entergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency System Data File for PILUSGS.SYS 1 1 CDFALL LMCDF Sequence Data File: PILUSGS.SEO PIL-SEQI PIL-SEQI 1 11 ESURROGATZ PIL-SEQ2 T?IL-SEQ2 1 1 3

\ESURROGATZ ELOSPXXXXZ CDFALL ALL I Hazard Data File: PILTJSGS.HAZ

  • Pilgrimn 2008 USGS Hazard Curves* ...HAZHEAD (A40)

... NHAZ 15 ... NPHAZ 1.0 ...PWHAZ(I) 0.0148 0.0288 0.0401 0.0771 0.1065 0.1957 0.2610 0.3410 0.5161 0.6283 0.7936 0.9000 1.0464 1.3832 1.8744 6.76E-03 3.12E-03 2.06E-03 8.68E-04 5.55E-04 2.23E-04 1.38E-04 8.57E-05 3.11E-05 1.77E-05 9.51E-06 7.08E-06 4.65E-06 1.96E-06 5.99E-07 Page 38 of 102

ftEnt&Vg ENG REPORT PN PS-RPT-I 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Page 17 USGSCDF.BAS SHIP Basic Output No. Damage State Damage State No. of Contributing Sequence Risks Name Risk Sequences (in decreasing order of importance) 1 ALL 3.78E-05 2 No. Sequence Name Sequence Risk  % of Total I PIL-SEQ2 3.50E-05 92.44 2 PIL-SEQI 2.86E-06 7.56 Sum: 3.78E-05 100.00 Page 18 USGSCDF.BAS SHIP Basic Output Summary of Plant Level Fragility Conditional Probability of Failure PGA (g)

.050 .314

.150 .378

.250 .418

.500 .490

.750 .543

.850 .630

.950 .808 HCLPF (See note) .252 Note: Best Estimate Case HCLPF HCLPF = Ground motion level for which there is a high confidence of a low probability of failure

= Amed

  • exp( -2.3
  • Beta)

(Assuming the plant fragility is Lognormally distributed, the HCLPF corresponds to a 1.072%

probability of failure)

Page 39 of 102

ENG REPORT PNPS-RPT-11-00001 t-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation #3 Names File for PILRUNI.NAM PILRUN 1.GEN PILRUNI .SYS PILRUN 1.CMP PILRUN1.SEQ USGS.HAZ PILRUN 1.NAM 05-09-94 Basic Inout File for PILRUNI.GEN Pilgrim SPRA Boston Edison Company Level I PRA RANOPO 1 1 2 1 129 7 121 1 2 nsupcmp,ncomps,ncmpnln, nr, nsys, nseq,ndmg PGA (g) 1 .04 .02 0.98 1290 2

Page 40 of 102

fib

  • ENG REPORT PNPS-RPT-1 1-00001 t-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency Basic Event Data File for PILRUN1.CMP ESISLXXXXZ SISL EBAAXXXXXZ 2.11 0.46 0 0 EBABD3XXXZ 2.28 0.46 0 0 EBCDI145XZ 2.11 0.46 0 0 EBCD12-13Z 2.28 0.46 0 0 EBDDGBLDXZ 0.77 0.46 0 0 EBSA5XXXXZ 1.76 0.46 0 0 EBSA600XXZ 2.09 0.46 0 0 EBSA6XXXXZ 2.09 0.46 0 0 EBSA8XXXXZ 0.96 0.29 0.37 0 EBSBIOXXXZ 2.24 0.46 0 0 EBSBI415XZ 1.51 0.46 0 0 EBSBI718XZ 2 0.46 0 0 EBSBIXXXXZ 2 0.46 0 0 EBSB2XXXXZ 0.84 0.46 0 0 EBSB6XXXXZ 2 0.46 0 0 EBSD16XXXZ 2.11 0.46 0 0 EBSD17XXXZ 2.28 0.46 0 0 EBSD4XXXXZ 2.11 0.46 0 0 EBSD5XXXXZ 2.28 0.46 0 0 EBSD7XXXXZ 2 0.46 0 0 EBSY34XXXZ 1.49 0.46 0 0 EBWI85/1XZ 1.41 0.46 0 0 EBW195/23Z 1 0.46 0 0 EBW198/OXZ 2.29 0.46 0 0 EBW198/IXZ 3.43 0.33 0.72 0 EBW 198/2XZ 3.43 0.33 0.72 0 EBW198/3XZ 2.29 0.46 0 0 EBW209/OXZ 0.82 0.46 0 0 EBW209/IXZ 1.72 0.46 0 0 EBW210/OXZ 1.65 0.34 0.46 0 EBW210/1XZ 1.84 0.46 0 0 EBW210/3XZ 2 0.46 0 0 EBW45/3XXZ 1.07 0.46 0 0 ECBD29XXXZ 2.23 0.46 0 0 ECBD30-31Z 2.28 0.46 0 0 ECMKI03ABZ 1.28 0.46 0 0 ECONTLRODZ 1.55 0.46 0 0 ECOREPLATZ 2.9 0.46 0 0 EDLGEABXXZ 1.39 0.32 0.57 0 EDLGESBOXZ 2 0.46 0 0 EDP2233ABZ 1.49 0.46 0 0 EDPC2258XZ 2.13 0.46 0 0 EDPC5XXXXZ 2.11 0.46 0 0 Page 41 of 102

A nENG REPORT PNPS-RPT-1 1-00001 e-EnteWg Re-assessment of Pilgrim Seismic Core Damage Frequency EDPC6XXXXZ 2.11 0.46 0 0 EDPC93023Z 2.28 0.46 0 0 EDPC93912Z 2.28 0.46 0 0 EDRYWSUPPZ 2.62 0.46 0 0 EDWSHIELDZ 2.04 0.46 0 0 EFN201ABXZ 1.23 0.46 0 0 EFN202ABXZ 1.23 0.46 0 0 EFN203ABXZ 1.23 0.46 0 0 EFN204ABXZ 0.61 0.46 0 0 EFN204CDXZ 0.61 0.46 0 0 EFN207A-DZ 1.01 0.46 0 0 EFNDWCOOLZ 1.06 0.46 0 0 EFUAXXXXXZ 2.23 0.46 0 0 EFUBXXXXXZ 2.5 0.46 0 0 EFUD3XXXXZ 2.28 0.46 0 0 EFUELCHANZ 3.96 0.46 0 0 EINCORHOUZ 2.75 0.46 0 0 EINTKPANLZ 4.54 0.46 0 0 EISLOCACSZ 0 0.46 0 0 EISLOCRHRZ 0 0.46 0 0 ELOCAHPCIZ 2.5 0.46 0 0 ELOCARCICZ 2.5 0.46 0 0 EPMI41ABXZ 1.28 0.46 0 0 EPM 184AXXZ 1.05 0.46 0 0 EPM202A-FZ 2.13 0.46 0 0 EPM203A-DZ 2.33 0.46 0 0 EPM208A-EZ 2.32 0.46 0 0 EPTHPCIXXZ 2.33 0.46 0 0 EPTRCICXXZ 2.33 0.46 0 0 ERBTRKLOKZ 3.55 0.46 0 0 ERE12759!Z 0.89 0.31 0.51 0 ERE12769!Z 1.04 0.31 0.51 0 EREI32X9!Z 0.55 0.31 0.51 0 EREI425B!Z 1.14 0.31 0.51 0 ERE15159!Z 0.89 0.31 0.51 0 ERE15169!Z 1.04 0.31 0.51 0 EREI59X9!Z 0.55 0.31 0.51 0 ERE16059!Z 0.89 0.31 0.51 0 ERE16069!Z 1.04 0.31 0.51 0 ERE18159!Z 0.89 0.31 0.51 0 ERE18169!Z 1.04 0.31 0.51 0 EREI865X!Z 0.73 0.31 0.51 0 ERE18681!Z 1.34 0.31 0.51 0 ERE18759!Z 0.89 0.31 0.51 0 ERE18769!Z 1.04 0.31 0.51 0 ERE18781!Z 0.25 0.31 0.51 0 ERE2352X!Z 1.2 0.31 0.51 0 ERE2759X!Z 1.55 0.31 0.51 0 ERE27A5X!Z 0.89 0.31 0.51 0 Page 42 of 102

A tENG REPORT PNPS-RPT-11-00001

!t-Enter~gy Re-assessment of Pilgrim Seismic Core Damage Frequency ERE27A6X!Z 1.04 0.31 0.51 0 ERE32801!Z 1 0.31 0.51 0 ERE40801!Z 0.67 0.31 0.51 0 ERE46801!Z 0.67 0.31 0.51 0 ERE51N81!Z 1 0.31 0.51 0 ERE51NG8!Z 1 0.31 0.51 0 ERE5INV8!Z 1 0.31 0.51 0 ERE59801!Z 1 0.31 0.51 0 ERINGGIRDZ 2.54 0.46 0 0 ERPVPEDESZ 3.27 0.46 0 0 ERPVSTABLZ 1.52 0.46 0 0 ERWCONCWLZ 1.93 0.46 0 0 ERXBLDDWLZ 3.57 0.46 0 0 ERXBLDFOUZ 1.76 0.46 0 0 ESHDSPGUSZ 2.54 0.46 0 0 ESURROGATZ 1 0.3 0 0 ETBCONCWLZ 3.89 0.46 0 0 ETK105ABNZ 0.16 0.46 0 0 ETKT105ABZ 0.94 0.46 0 0 ETKT124ABZ 4.81 0.65 0 0 ETKT126ABZ 1.44 0.46 0 0 ETKT201ABZ 2.1. 0.46 0 0 ETOPGUIDEZ 2.56 0.46 0 0 ETVX21XXXZ 1.76 0.46 0 0 ETVX22XXXZ 2.77 0.46 0 0 ETVX55XXXZ 1.49 0.46 0 0 EUPLOFLORZ 1.4 0.46 0 0 EVA452122Z 2.9 0.46 0 0 EVESUPSKTZ 6.15 0.46 0 0 EVPEABXXXZ 1.28 0.46 0 0 EVRCABXXXZ 1.28 0.46 0 0 EVS4563ABZ 2.9 0.46 0 0 EVS4563CDZ 2.9 0.46 0 0 EVS4565CDZ 1.28 0.46 0 0 EVS4582ABZ 2.9 0.46 0 0 EVS4582CDZ 2.9 0.46 0 0 ELOSPXXXXZ 0.35 0.55 0 0 EBCD 14XXXY 1 2 0.0000 2 1.0 0.0000 0.OOE+00 EDLGESBOXY 1 2 0.0000 2 1.0 0.0000 0.OOE+00 ELPSPPRPLY 1 2 0.0000 2 1.0 0.0000 0.OOE+00 ESPCOOLXXY 1 2 0.0000 2 1.0 0.0000 0.OOE+00 Page 43 of 102

SEntergy ENG REPORT PNPS-RPT-I 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency ESPC36ABXY 1 2 0.0000 2 1.0 0.0000 O.OOE+00 ERERESET!Y 1 2 0.0000 2 1.0 0.0000 0.OOE+00 EVMMO45X!Y 1 2 0.0000 2 1.0 0.0000 0.OOE+00 ACBI5250IF 0.OOE+00 0.001 ACBI52509L 0.OOE+00 0.001 ACBI52601F 0.OOE+00 0.001 ACB152609L 0.OOE+00 0.001 ACB152802F 0.OOE+00 0.001 ACB5605CCN 0.OOE+00 0.001 ACB5609CCC 0.OOE+00 0.001 ADLADL3CCR 0.OOE+00 0.001 ADLADLBCCR 0.OOE+00 0.001 ADLADLBCCS 0.OOE+00 0.001 ADLBDL3CCR 0.OOE+00 0.001 ADLGI23CCR 0.OOE+00 0.001 ADLGEAXXXS 0.OOE+00 0.001 ADLGEAXXXU 0.OOE+00 0.001 ADLGEBXXXR 0.OOE+00 0.001 ADLGEBXXXU 0.OOE+00 0.001 ADLGESBOXS 0.OOE+00 0.001 ADLGESBOXU 0.OOE+00 0.001 ALOCALOOP 0.OOE+00 0.001 APM141AXXR 0.OOE+00 0.001 APM141BXXR 0.OOE+00 0.001 APM 184AXXR 0.OOE+00 0.001 APMI84AXXS 0.OOE+00 0.001 AVA452XCCN 0.OOE+00 0.001 BPM5XXXCCS 0.OOE+00 0.001 BPMBXXXXXU 0.OOE+00 0.001 BPMCXXXXXU 0.OOE+00 0.001 BPMEXXXXXU 0.OOE+00 0.001 BPMFXXXXXU 0.OOE+00 0.001 BVM3801XXC 0.OOE+00 0.001 BVM3805XXC 0.OOE+00 0.001 CM 0.OOE+00 0.001 CVC9AXXXXC 0.OOE+00 0.001 CVC9BXXXXC 0.OOE+00 0.001 DBC21XXCCR 0.OOE+00 0.001 DBCDIINORE 0.OOE+00 0.001 DBCDI 1XXXU 0.OOE+00 0.001 DBCD12NORE 0.OOE+00 0.001 DBCD12XXXU 0.OOE+00 0.001 EBCDI1XXXR 0.OOE+00 0.001 Page 44 of 102

A n ENG REPORT PNPS-RPT-1 1-00001 c,-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency EBCD12XXXR 0.OOE+00 0.001 ECB152504F 0.00E+00 0.001 ECB152505N 0.00E+00 0.001 ECB152508L 0.OOE+00 0.001 ECB152509C 0.OOE+00 0.001 ECB 152600L 0.OOE+00 0.001 ECB152604F 0.OOE+00 0.001 ECB 152605N 0.OOE+00 0.001 ECB 152608L 0.OOE+00 0.001 ECB 152609C 0.OOE+00 0.001 ECB152801C 0.OOE+00 0.001 ECB 152802N 0.OOE+00 0.001 ECB5605AXY 0.OOE+00 0.001 ECB5605DXY 0.OOE+00 0.001 EDLGEAXXXR 0.OOE+00 0.001 EDLGEBXXXS 0.OOE+00 0.001 EDLGESBOXR 0.OOE+00 0.001 EHX209AXXU 0.OOE+00 0.001 EHX209BXXU 0.OOE+00 0.001 ELOCAHPCIR 0.OOE+00 0.001 ELOCARCICR 0.OOE+00 0.001 EPMI41AXXS 0.OOE+00 0.001 EPMI41BXXS 0.OOE+00 0.001 EPM208AXXS 0.OOE+00 0.001 EPM208BXXS 0.OOE+00 0.001 EPM208EXXS 0.OOE+00 0.001 EPTHPCIXXR 0.OOE+00 0.001 EPTRCICXXR 0.OOE+00 0.001 EVA4521XXN 0.OOE+00 0.001 EVA4522XXN 0.OOE+00 0.00 1 EVMI30117C 0.OOE+00 0.001 EVM23015XC 0.OOE+00 0.001 HPMAUXOILS 0.OOE+00 0.001 HPME205XXS 0.OOE+00 0.001 HPTHPCIXXS 0.OOE+00 0.001 HPTHPRCCCR 0.OOE+00 0.001 HPTHPRCCCS 0.OOE+00 0.001 HSYHPCIMNU 0.OOE+00 0.001 HVMMO35XXN 0.OOE+00 0.001 HVMMO36XXN 0.OOE+00 0.001 HVMMO3XXXN 0.OOE+00 0.001 HVMMO6XXXC 0.OOE+00 0.001 HVMMO8XXXN 0.OOE+00 0.001 ILPRCICMNU 0.OOE+00 0.001 IPTRCICXXS 0.OOE+00 0.001 IPVVACPMPS 0.OOE+00 0.001 IVMINJVCCN 0.OOE+00 0.001 IVMMO49XXN 0.OOE+00 0.00 i IVMMO6OXXC 0.OOE+00 0.00 1 Page 45 of 102

A ENG REPORT PNPS-RPT-1 1-00001 c-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency IVMMO61XXN 0.00E+00 0.001 IVMMO62XXN 0.OOE+00 0.001 P 0.OOE+00 0.001 RHXE207AXU 0.OOE+00 0.001 RHXE207BXU 0.OOE+00 0.001 RLPSPCOLAU 0.OOE+00 0.001 RLPSPCOLBU 0.OOE+00 0.001 RPMABCDCCS 0.OOE+00 0.001 RVC68AXXXC 0.OOE+00 0.001 RVC68BXXXC 0.OOE+00 0.001 RVM 1OABCCN 0.OOE+00 0.001 RVM3436CCN 0.OOE+00 0.001 RVM34ABCCN 0.OOE+00 0.001 RVM34AXXXN 0.OOE+00 0.001 RVM34BXXXN 0.OOE+00 0.001 RVM36ABCCN 0.OOE+00 0.001 RVM36AXXXN 0.OOE+00 0.001 RVM36BXXXN 0.OOE+00 0.00 1 RVM4A6BCCN 0.OOE+00 0.001 RVM4B6ACCN 0.OOE+00 0.001 RVM60ABCCN 0.OOE+00 0.00 1 SPMABXXCCS 0.OOE+00 0.001 SPMALLXCCS 0.OOE+00 0.001 SPMP208BXU 0.OOE+00 0.001 SPMP208EXU 0.OOE+00 0.001 SVC3880BXN 0.OOE+00 0.001 SVC3880EXN 0.OOE+00 0.001 ETRANSFLAG 1.00E+00 0.001 RVM29AXXXL 0.OOE+00 0.001 RVM29BXXXL 0.OOE+00 0.001 EVM25BXXXL 0.OOE+00 0.001 CVM25AXXXL 0.OOE+00 0.001 Page 46 of 102

ENG REPORT PNPS-RPT-1 1-00001 c-Ent&Wg Re-assessment of Pilgrim Seismic Core Damage Frequency System Data File for PILRUNI .SYS 1 1 CDFALL LMCDF Sequence Data File: PILRUN1.SEQ PIL-SEQI PIL-SEQI 11 1 ESURROGATZ PIL-SEQ2 IPIL-SEQ2 1 1 3

\ESURROGATZ ELOSPXXXXZ CDFALL ALL I Hazard Data File: USGS.HAZ

  • Pilgrim 2008 USGS Hazard Curves* ...HAZHEAD (A40) 1 ...NHAZ 15 ...NPHAZ 1.0 ...PWM-AZ(I) 0.0148 0.0288 0.0401 0.0771 0.1065 0.1957 0.2610 0.3410 0.5161 0.6283 0.7936 0.9000 1.0464 1.3832 1.8744 6.76E-03 3.12E-03 2.06E-03 8.68E-04 5.55E-04 2.23E-04 1.38E-04 8.57E-05 3.11E-05 1.77E-05 9.51E-06 7.08E-06 4.65E-06 1.96E-06 5.99E-07 Page 47 of 102

doEntergy ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Page 17 RANOPO.BAS SHIP Basic Output No. Damage State Damage State No. of Contributing Sequence Risks Name Risk Sequences (in decreasing order of importance)

I ALL 2.33E-05 2 No. Sequence Name Sequence Risk  % of Total I PIL-SEQ2 2.05E-05 87.73 2 PIL-SEQI 2.86E-06 12.27 Sum: 2.33E-05 100.00 Page 18 RANOPO.BAS SHIP Basic Output Summary of Plant Level Fragility Conditional Probability of Failure PGA (g)

.050 .383

.150 .444

.250 .484

.500 .564

.750 .657

.850 .714

.950 .836 HCLPF (See note) .321 Note: Best Estimate Case HCLPF HCLPF = Ground motion level for which there is a high confidence of a low probability of failure

= Amed

  • exp( -2.3
  • Beta )

(Assuming the plant fragility is Lognormally distributed, the HCLPF corresponds to a 1.072%

probability of failure)

Page 48 of 102

,.Enterg ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation #4 Names File for PILCDF2.NAM PILCDF2.GEN PILCDF2.SYS PILCDF2.CMP PILCDF2.SEQ USGS.HAZ PILCDF2.NAM 05-19-11 Basic Input File for PILCDF2.GEN Pilgrim SPRA Entergy Nuclear FRAG&BE Data (USGS)

SCDF2 1 1 2 1 1 1 1 129 7 122 1 2 1 nsupcmp,ncomps,ncmpnln,nr,nsys,nseq,ndmg PGA (g) 1 .04 .02 0.98 1290 2

PILCDF2.GEN 05-19-11 Page 49 of 102

-:Ent&r ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Basic Event Data File for PILCDF2.CMP ESISLXXXXZ SISL EBAAXXXXXZ 2.11 0.46 0 0 EBABD3XXXZ 2.28 0.46 0 0 EBCD1145XZ 2.11 0.46 0 0 EBCD12-13Z 2.28 0.46 0 0 EBDDGBLDXZ 1.04 0.46 0 0 EBSA5XXXXZ 1.76 0.46 0 0 EBSA600XXZ 2.09 0.46 0 0 EBSA6XXXXZ 2.09 0.46 0 0 EBSA8XXXXZ 0.96 0.29 0.37 0 EBSBIOXXXZ 2.24 0.46 0 0 EBSB1415XZ 1.51 0.46 0 0 EBSBI178XZ 2 0.46 0 0 EBSBIXXXXZ 2 0.46 0 0 EBSB2XXXXZ 1.13 0.46 0 0 EBSB6XXXXZ 2 0.46 0 0 EBSD16XXXZ 2.11 0.46 0 0 EBSD17XXXZ 2.28 0.46 0 0 EBSD4XXXXZ 2.11 0.46 0 0 EBSD5XXXXZ 2.28 0.46 0 0 EBSD7XXXXZ 2 0.46 0 0 EBSY34XXXZ 1.49 0.46 0 0 EBW 185/IXZ 1.41 0.46 0 0 EBW195/23Z 2 0.46 0 0 EBW198/OXZ 2.29 0.46 0 0 EBW198/1XZ 3.43 0.33 0.72 0 EBW198/2XZ 3.43 0.33 0.72 0 EBW198/3XZ 2.29 0.46 0 0 EBW209/OXZ 2 0.46 0 0 EBW209/1 XZ 1.72 0.46 0 0 EBW210/OXZ 1.65 0.34 0.46 0 EBW210/1XZ 1.84 0.46 0 0 EBW210/3XZ 2 0.46 0 0 EBW45/3XXZ 2 0.46 0 0 ECBD29XXXZ 2.23 0.46 0 0 ECBD30-3IZ 2.28 0.46 0 0 ECMK I03ABZ 1.73 0.46 0 0 ECONTLRODZ 1.55 0.46 0 0 ECOREPLATZ 2.9 0.46 0 0 EDLGEABXXZ 1.39 0.32 0.57 0 EDLGESBOXZ 2 0.46 0 0 EDP2233ABZ 1.49 0.46 0 0 EDPC2258XZ 2.13 0.46 0 0 EDPC5XXXXZ 2.11 0.46 0 0 EDPC6XXXXZ 2.11 0.46 0 0 EDPC93023Z 2.28 0.46 0 0 Page 50 of 102

".,Ent&W ENG REPORT PNPS-RPT-I1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency EDPC93912Z 2.28 0.46 0 0 EDRYWSUPPZ 2.62 0.46 0 0 EDWSMIELDZ 2.04 0.46 0 0 EFN201ABXZ 2 0.46 0 0 EFN202ABXZ 2 0.46 0 0 EFN203ABXZ 2 0.46 0 0 EFN204ABXZ 2 0.46 0 0 EFN204CDXZ 2 0.46 0 0 EFN207A-DZ 2 0.46 0 0 EFNDWCOOLZ 1.06 0.46 0 0 EFUAXXXXXZ 2.23 0.46 0 0 EFUBXXXXXZ 2.5 0.46 0 0 EFUD3XXXXZ 2.28 0.46 0 0 EFUELCHANZ 3.96 0.46 0 0 EINCORHOUZ 2.75 0.46 0 0 EINTKPANLZ 4.54 0.46 0 0 EISLOCACSZ 0 0.46 0 0 EISLOCRHRZ 0 0.46 0 0 ELOCAHPCIZ 2.5 0.46 0 0 ELOCARCICZ 2.5 0.46 0 0 EPM 141 ABXZ 1.73 0.46 0 0 EPM184AXXZ 1.42 0.46 0 0 EPM202A-FZ 2.13 0.46 0 0 EPM203A-DZ 2.33 0.46 0 0 EPM208A-EZ 2.32 0.46 0 0 EPTHPCIXXZ 2.33 0.46 0 0 EPTRCICXXZ 2.33 0.46 0 0 ERBTRKLOKZ 3.55 0.46 0 0 ERE12759!Z 0.89 0.31 0.51 0 ERE12769!Z 1.04 0.31 0.51 0 ERE!32X9!Z 1.5 0.31 0.51 0 EREI425B!Z 1.14 0.31 0.51 0 EREI5159!Z 0.89 0.31 0.51 0 EREi5i69!Z 1.04 0.31 0.51 0 ERE159X9!Z 2.22 0.31 0.51 0 ERE16059!Z 0.89 0.31 0.51 0 ERE16069!Z 1.04 0.31 0.51 0 ERE18159!Z 0.89 0.31 0.51 0 ERE18169!Z 1.04 0.31 0.51 0 ERE1865X!Z 0.73 0.31 0.51 0 EREI8681!Z 1.34 0.31 0.51 0 ERE18759!Z 0.89 0.31 0.51 0 ERE18769!Z 1.04 0.31 0.51 0 ERE18781!Z 0.25 0.31 0.51 0 ERE2352X!Z 1.2 0.31 0.51 0 ERE2759X!Z 1.55 0.31 0.51 0 ERE27A5X!Z 0.89 0.31 0.51 0 ERE27A6X!Z 1.04 0.31 0.51 0 ERE32801!Z 1 0.31 0.51 0 Page 51 of 102

ENG REPORT PNPS-RPT-1 1-00001

!Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency ERE40801 !Z 0.67 0.31 0.51 0 ERE46801 !Z 0.67 0.31 0.51 0 ERE51N81!Z 1 0.31 0.51 0 ERE5 1NG8!Z 1 0.31 0.51 0 ERE51V81 !Z 1 0.31 0.51 0 ERE5980 !!Z 1 0.31 0.51 0 ERINGGIRDZ 2.54 0.46 0 0 ERPVPEDESZ 3.27 0.46 0 0 ERPVSTABLZ 1.52 0.46 0 0 ERWCONCWLZ 1.93 0.46 0 0 ERXBLDDWLZ 3.57 0.46 0 0 ERXBLDFOUZ 1.76 0.46 0 0 ESHDSPGUSZ 2.54 0.46 0 0 ESURROGATZ 1 0.3 0 0 ETBCONCWLZ 3.89 0.46 0 0 ETKI05ABNZ 5 0.46 0 0 ETKT105ABZ 1.27 0.46 0 0 ETKT 124ABZ 4.81 0.65 0 0 ETKT126ABZ 1.44 0.46 0 0 ETKT201ABZ 2.1 0.46 0 0 ETOPGUIDEZ 2.56 0.46 0 0 ETVX21IXXXZ 1.76 0.46 0 0 ETVX22XXXZ 2.77 0.46 0 0 ETVX55XXXZ 1.49 0.46 0 0 EUPLOFLORZ 1.4 0.46 0 0 EVA452122Z 2.9 0.46 0 0 EVESUPSKTZ 6.15 0.46 0 0 EVPEABXXXZ 1.73 0.46 0 0 EVRCABXXXZ 1.73 0.46 0 0 EVS4563ABZ 2.9 0.46 0 0 EVS4563CDZ 2.9 0.46 0 0 EVS4565CDZ 1.73 0.46 0 0 EVS4582ABZ 2.9 0.46 0 0 EVS4582CDZ 2.9 0.46 0 0 ELOSPXXXXZ 0.35 0.55 0 0 EBCD14XXXY 1 5 0.0000 0.15 0.4999 0.5 2 1.0 2.5e-2 2.50E-02 2.50E-0 1 5.OOE-01 5.OOE-01 EDLGESBOXY 1 5 0.0000 0.15 0.4999 0.5 2 1.0 3.2e-3 3.20E-03 3.20E-02 5.OOE-0 I 5.OOE-01 ELPSPPRPLY 1 5 0.0000 0.15 0.4999 0.5 2 1.0 4.0e-3 4.OOE-03 4.OOE-02 1.00E+00 1.00E+00 ESPCOOLXXY 1 5 0.0000 0.15 0.4999 0.5 2 1.0 5.Ie-4 5. iOE-04 5.1OE-03 5.OOE-02 5.OOE-02 ESPC36ABXY 1 5 0.0000 0.15 0.4999 0.5 2 Page 52 of 102

SEntergy ENG REPORT PN PS-RPT-1 !-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency 1.0 5.0e-1 5.OOE-01 5.OOE-01 7.50E-01 7.50E-01 ERERESET!Y 5 0.0000 0.15 0.4999 0.5 2 1.0 9.OE-2 9.OOE-02 5.OOE-01 5.OOE-01 5.OOE-01 EVMMO45X!Y 5 0.0000 0.15 0.4999 0.5 2 1.0 6.6E-2 6.60E-02 5.O0E-01 5.OOE-01 5.OOE-01 ACB152501F 1.49E-04 0.001 ACB152509L 1.49E-04 0.001 ACB152601F 1.49E-04 0.001 ACB152609L 1.49E-04 0.001 ACB152802F 1.49E-04 0.001 ACB5605CCN 2.2 iE-05 0.001 ACB5609CCC 8.86E-05 0.001 ADLADL3CCR 2.64E-04 0.001 ADLADLBCCR 2.64E-04 0.001 ADLADLBCCS 4.90E-05 0.001 ADLBDL3CCR 2.64E-04 0.001 ADLG 123CCR 1.32E-05 0.001 ADLGEAXXXS 4.80E-03 0.001 ADLGEAXXXU 1.18E-02 0.001 ADLGEBXXXR 7.92E-03 0.001 ADLGEBXXXU 1.09E-02 0.001 ADLGESBOXS 4.80E-03 0.001 ADLGESBOXU 1.42E-02 0.001 ALOCALOOP 1.00E+00 0.001 APM141AXXR 6.84E-04 0.001 APMI41BXXR 6.84E-04 0.001 APM I84AXXR 6.84E-04 0.001 APM 184AXXS 4.95E-04 0.001 AVA452XCCN 4.OOE-05 0.001 BPM5XXXCCS 4.80E-05 0.001 BPMBXXXXX U 1.09E-02 0.001 BPMCXXXXXU 1.09E-02 0.001 BPMEXXXXXU 1.09E-02 0.001 BPMFXXXXXU 1.09E-02 0.001 BVM380 1XXC 1.65E-03 0.001 BVM3805XXC 1.65E-03 0.001 CM 7.50E-06 0.001 CVC9AXXXXC 2.66E-04 0.001 CVC9BXXXXC 2.66E-04 0.001 DBC2IXXCCR 1.57E-05 0.001 DBCDI INORE 6.80E-01 0.001 DBCDI IXXXU 7.30E-04 0.001 DBCD I2NORE 6.80E-01 0.001 DBCD 12XXXU 7.30E-04 0.001 EBCDI IXXXR 2.98E-04 0.001 EBCD12XXXR 2.98E-04 0.001 ECB152504F 1.49E-04 0.001 Page 53 of 102

j -E tENG REPORT PNPS-RPT-1 1-00001

'c--EnteWg Re-assessment of Pilgrim Seismic Core Damage Frequency ECB 152505N 1.99E-04 0.001 ECB152508L 1.49E-04 0.001 ECB 152509C 7.97E-04 0.001 ECB 152600L 1.49E-04 0.001 ECB152604F 1.49E-04 0.001 ECB152605N 1.99E-04 0.001 ECB152608L 1.49E-04 0.001 ECB152609C 7.97E-04 0.001 ECB152801C 1.99E-04 0.001 ECB152802N 1.99E-04 0.001 ECB5605AXY 1.00E+00 0.001 ECB5605DXY 1.00E+00 0.001 EDLGEAXXXR 7.92E-03 0.001 EDLGEBXXXS 4.80E-03 0.001 EDLGESBOXR 7.92E-03 0.001 EHX209AXXU 2.66E-02 0.001 EHX209BXXU 2.66E-02 0.001 ELOCAHPCIR 1.23E-04 0.001 ELOCARCICR 1.23E-04 0.001 EPM141AXXS 4.95E-04 0.001 EPM141BXXS 4.95E-04 0.001 EPM208AXXS 9.20E-03 0.001 EPM208BXXS 9.20E-03 0.001 EPM208EXXS 9.20E-03 0.001 EPTHPCIXXR 3.93E-03 0.001 EPTRCICXXR 9.78E-03 0.001 EVA4521XXN 1.60E-04 0.001 EVA4522XXN 1.60E-04 0.001 EVM130117C 1.65E-03 0.001 EVM23015XC 1.65E-03 0.001 HPMAUXOILS 3.33E-03 0.001 HPME205XXS 3.OOE-03 0.001 1-PTHPCIXXS 3.33E-03 0.001 HPTHPRCCCR 2.31E-07 0.001 HPTHPRCCCS 3.46E-05 0.001 HSYHPCIMNU 1.21E-02 0.001 HVMMO35XXN 1.65E-03 0.001 HVMMO36XXN 1.65E-03 0.001 HVMMO3XXXN 1.03E-03 0.001 HVMMO6XXXC 1.65E-03 0.001 HVMMO8XXXN 1.65E-03 0.001 ILPRCICMNU 8.74E-03 0.001 IPTRCICXXS 3.33E-03 0.001 IPVVACPMPS 3.OOE-03 0.001 IVMINJVCCN 1.30E-04 0.001 IVMMO49XXN 1.50E-03 0.001 IVMMO6OXXC 1.65E-03 0.001 IVMMO61XXN 1.50E-03 0.001 IVMMO62XXN 1.65E-03 0.001 Page 54 of 102

is E trENG REPORT PNPS-RPT- 1-00001 tý-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency P 6.80E-03 0.001 RHXE207AXU 5.OOE-04 0.001 RHXE207BXU 5.OOE-04 0.001 RLPSPCOLAU 3.OOE-03 0.001 RLPSPCOLBU 3.OOE-03 0.001 RPMABCDCCS 1.70E-05 0.001 RVC68AXXXC 2.66E-04 0.00 1 RVC68BXXXC 2.66E-04 0.001 RVM1OABCCN 1.30E-04 0.001 RVM3436CCN 1.30E-05 0.001 RVM34ABCCN 3.70E-05 0.001 RVM34AXXXN 1.50E-03 0.001 RVM34BXXXN 1.50E-03 0.001 RVM36ABCCN 3.70E-05 0.001 RVM36AXXXN 1.50E-03 0.001 RVM36BXXXN 1.50E-03 0.001 RVM4A6BCCN 3.70E-05 0.001 RVM4B6ACCN 3.70E-05 0.001 RVM60ABCCN 1.30E-04 0.001 SPMABXXCCS 2.60E-04 0.001 SPMALLXCCS 1.63E-05 0.001 SPMP208BXU 2.98E-02 0.001 SPMP208EXU 2.98E-02 0.001 SVC3880BXN 1.57E-03 0.001 SVC3880EXN 1.57E-03 0.001 ETRANSFLAG 1.00E+00 0.001 RVM29AXXXL i .20E-05 0.001 RVM29BXXXL 1.20E-05 0.001 EVM25BXXXL 1.20E-05 0.001 CVM25 AXXXL 1.20E-05 0.001 JAF-INSERT 4.65E-03 0.001 Page 55 of 102

ENG REPORT PNPS-RPT-! 1-00001 t-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency System Data File for PILCDF2.SYS 1 1 CDFALL LMCDF Sequence Data File: PILCDF2.SEQ PIL-SEQI PIL-SEQI 11 1 ESURROGATZ PIL-SEQ2 IPIL-SEQ2 1 1 3

\ESURROGATZ ELOSPXXXXZ CDFALL ALL I Hazard Data File: USGS.HAZ

  • Pilgrim 2008 USGS Hazard Curves* ...HAZHEAD (A40) 1 .N.-IAZ 15 ...NPHAZ 1.0 ...PWI IAZ(I) 0.0148 0.0288 0.0401 0.0771 0.1065 0.1957 0.2610 0.3410 0.5161 0.6283 0.7936 0.9000 1.0464 1.3832 1.8744 6.76E-03 3.12E-03 2.06E-03 8.68E-04 5.55E-04 2.23E-04 1.38E-04 8.57E-05 3.11E-05 1.77E-05 9.51E-06 7.08E-06 4.65E-06 1.96E-06 5.99E-07 Page 56 of 102

'Enteigy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Page 17 SCDF2.BAS SHIP Basic Output No. Damage State Damage State No. of Contributing Sequence Risks Name Risk Sequences (in decreasing order of importance)

I ALL 2.14E-05 2 No. Sequence Name Sequence Risk  % of Total I PIL-SEQ2 1.85E-05 86.60 2 PIL-SEQI 2.86E-06 13.40 Sum: 2.14E-05 100.00 Page 18 SCDF2.BAS SHIP Basic Output Summary of Plant Level Fragility Conditional Probability of Failure PGA (g)

.050 .400

.150 .471

.250 .500

.500 .572

.750 .685

.850 .754

.950 .888 HCLPF (See note) .326 Note: Best Estimate Case HCLPF HCLPF = Ground motion level for which there is a high confidence of a low probability of failure

= Amed

  • exp( -2.3
  • Beta )

(Assuming the plant fragility is Lognormally distributed, the HCLPF corresponds to a 1.072%

probability of failure)

Page 57 of 102

A t ENG REPORT PNPS-RPT-1 1-00001

'týEntmvg Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation #5 Names File for PILRUN1.NAM PILRUN 1.GEN PILRUN1 .SYS PILRUN 1.CMP PILRUN1 .SEQ USGS.HAZ Basic Input File for PILRUN I.GEN Pilgrim SPRA Boston Edison Company Level 1 PRA RANOPO 1 1 2 1111 111 1 129 7 122 1 2 1 nsupcmp,ncomps,ncmpnln,nr,nsys,nseq,ndmg PGA (g) 1 .04 .02 0.98 1290 2

Page 58 of 102

A- EENG REPORT PNPS-RPT-1 1-00001 t-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency Basic Event Data File for PILRUN1.CMP ESISLXXXXZ SISL EBAAXXXXXZ 2.11 0.46 0 0 EBABD3XXXZ 2.28 0.46 0 0 EBCD1145XZ 2.11 0.46 0 0 EBCDI2-13Z 2.28 0.46 0 0 EBDDGBLDXZ 1.04 0.46 0 0 EBSA5XXXXZ 1.76 0.46 0 0 EBSA600XXZ 2.09 0.46 0 0 EBSA6XXXXZ 2.09 0.46 0 0 EBSA8XXXXZ 0.96 0.29 0.37 0 EBSBIOXXXZ 2.24 0.46 0 0 EBSB1415XZ 1.51 0.46 0 0 EBSB1718XZ 2 0.46 0 0 EBSBIXXXXZ 2 0.46 0 0 EBSB2XXXXZ 1.13 0.46 0 0 EBSB6XXXXZ 2 0.46 0 0 EBSD16XXXZ 2.11 0.46 0 0 EBSD17XXXZ 2.28 0.46 0 0 EBSD4XXXXZ 2.11 0.46 0 0 EBSD5XXXXZ 2.28 0.46 0 0 EBSD7XXXXZ 2 0.46 0 0 EBSY34XXXZ 1.49 0.46 0 0 EBW185/1XZ 1.41 0.46 0 0 EBW 195/23Z 2 0.46 0 0 EBW198/OXZ 2.29 0.46 0 0 EBW198/IXZ 3.43 0.33 0.72 0 EBW198/2XZ 3.43 0.33 0.72 0 EBW198/3XZ 2.29 0.46 0 0 EBW209/OXZ 2 0.46 0 0 EBW209/1XZ 1.72 0.46 0 0 EBW210/OXZ 1.65 0.34 0.46 0 EBW210/1XZ 1.84 0.46 0 0 EBW210/3XZ 2 0.46 0 0 EBW45/3XXZ 2 0.46 0 0 ECBD29XXXZ 2.23 0.46 0 0 ECBD30-31Z 2.28 0.46 0 0 ECMKI03ABZ 1.73 0.46 0 0 ECONTLRODZ 1.55 0.46 0 0 ECOREPLATZ 2.9 0.46 0 0 EDLGEABXXZ 1.39 0.32 0.57 0 EDLGESBOXZ 2 0.46 0 0 EDP2233ABZ 1.49 0.46 0 0 EDPC2258XZ 2.13 0.46 0 0 EDPC5XXXXZ 2.11 0.46 0 0 EDPC6XXXXZ 2.11 0.46 0 0 EDPC93023Z 2.28 0.46 0 0 Page 59 of 102

S EntegW ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency EDPC93912Z 2.28 0.46 0 0 EDRYWSUPPZ 2.62 0.46 0 0 EDWSHIELDZ 2.04 0.46 0 0 EFN201ABXZ 2 0.46 0 0 EFN202ABXZ 2 0.46 0 0 EFN203ABXZ 2 0.46 0 0 EFN204ABXZ 2 0.46 0 0 EFN204CDXZ 2 0.46 0 0 EFN207A-DZ 2 0.46 0 0 EFNDWCOOLZ 1.06 0.46 0 0 EFUAXXXXXZ 2.23 0.46 0 0 EFUBXXXXXZ 2.5 0.46 0 0 EFUD3XXXXZ 2.28 0.46 0 0 EFUELCHANZ 3.96 0.46 0 0 EINCORHOUZ 2.75 0.46 0 0 EINTKPANLZ 4.54 0.46 0 0 EISLOCACSZ 0 0.46 0 0 EISLOCRHRZ 0 0.46 0 0 ELOCAHPCIZ 2.5 0.46 0 0 ELOCARCICZ 2.5 0.46 0 0 EPM141ABXZ 1.73 0.46 0 0 EPM 184AXXZ 1.42 0.46 0 0 EPM202A-FZ 2.13 0.46 0 0 EPM203A-DZ 2.33 0.46 0 0 EPM208A-EZ 2.32 0.46 0 0 EPTHPCIXXZ 2.33 0.46 0 0 EPTRCICXXZ 2.33 0.46 0 0 ERBTRKLOKZ 3.55 0.46 0 0 ERE12759!Z 0.89 0.31 0.51 0 ERE12769!Z 1.04 0.31 0.51 0 EREI32X9!Z 1.5 0.31 0.51 0 EREI425B!Z 1.14 0.31 0.51 0 EREI5159!Z 0.89 0.31 0.51 0 EREI5169!Z 1.04 0.31 0.51 0 EREI59X9!Z 2.22 0.31 0.51 0 ERE16059!Z 0.89 0.31 0.51 0 ERE16069!Z 1.04 0.31 0.51 0 ERE18159!Z 0.89 0.31 0.51 0 ERE18169!Z 1.04 0.31 0.51 0 EREI865X!Z 0.73 0.31 0.51 0 ERE18681!Z 1.34 0.31 0.51 0 ERE18759!Z 0.89 0.31 0.51 0 ERE18769!Z 1.04 0.31 0.51 0 ERE18781!Z 0.25 0.31 0.51 0 ERE2352X!Z 1.2 0.31 0.51 0 ERE2759X!Z 1.55 0.31 0.51 0 ERE27A5X!Z 0.89 0.31 0.51 0 ERE27A6X!Z 1.04 0.31 0.51 0 ERE32801!Z 1 0.31 0.51 0 ERE40801!Z 0.67 0.31 0.51 0 Page 60 of 102

EENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency ERE46801!Z 0.67 0.31 0.51 0 ERE51N8l!Z 1 0.31 0.51 0 ERE5ING8!Z 1 0.31 0.51 0 ERE51V81!Z 1 0.31 0.51 0 ERE59801!Z 1 0.31 0.51 0 ERINGGIRDZ 2.54 0.46 0 0 ERPVPEDESZ 3.27 0.46 0 0 ERPVSTABLZ 1.52 0.46 0 0 ERWCONCWLZ 1.93 0.46 0 0 ERXBLDDWLZ 3.57 0.46 0 0 ERXBLDFOUZ 1.76 0.46 0 0 ESHDSPGUSZ 2.54 0.46 0 0 ESURROGATZ 1 0.3 0 0 ETBCONCWLZ 3.89 0.46 0 0 ETKI05ABNZ 5 0.46 0 0 ETKT105ABZ 1.27 0.46 0 0 ETKT124ABZ 4.81 0.65 0 0 ETKT126ABZ 1.44 0.46 0 0 ETKT201ABZ 2.1 0.46 0 0 ETOPGUIDEZ 2.56 0.46 0 0 ETVX2iXXXZ 1.76 0.46 0 0 ETVX22XXXZ 2.77 0.46 0 0 ETVX55XXXZ 1.49 0.46 0 0 EUPLOFLORZ 1.4 0.46 0 0 EVA452122Z 2.9 0.46 0 0 EVESUPSKTZ 6.15 0.46 0 0 EVPEABXXXZ 1.73 0.46 0 0 EVRCABXXXZ 1.73 0.46 0 0 EVS4563ABZ 2.9 0.46 0 0 EVS4563CDZ 2.9 0.46 0 0 EVS4565CDZ 1.73 0.46 0 0 EVS4582ABZ 2.9 0.46 0 0 EVS4582CDZ 2.9 0.46 0 0 ELOSPXXXXZ 0.35 0.55 0 0 EBCD14XXXY 1 2 0.0000 2 1.0 0.0000 0.OOE+00 EDLGESBOXY I 2 0.0000 2 1.0 0.0000 0.OOE+00 ELPSPPRPLY 1 2 0.0000 2 1.0 0.0000 0.OOE+00 ESPCOOLXXY 1 2 0.0000 2 1.0 0.0000 0.OOE+00 ESPC36ABXY 1 2 0.0000 2 1.0 0.0000 0.OOE+00 ERERESET!Y I Page 61 of 102

A E tENG REPORT PNPS-RPT-I 1-00001 ct-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency 2 0.0000 2 1.0 0.0000 0.00E+00 EVMMO45X!Y 1 2 0.0000 2 1.0 0.0000 0.OOE+00 ACB152501F 0.00E+00 0.001 ACB152509L 0.OOE+00 0.001 ACB152601F 0.OOE+00 0.001 ACB152609L 0.OOE+00 0.001 ACB152802F 0.OOE+00 0.001 ACB5605CCN 0.OOE+00 0.001 ACB5609CCC 0.OOE+00 0.001 ADLADL3CCR 0.OOE+00 0.001 ADLADLBCCR 0.OOE+00 0.00 1 ADLADLBCCS 0.OOE+00 0.00 1 ADLBDL3CCR 0.OOE+00 0.001 ADLG123CCR 0.OOE+00 0.001 ADLGEAXXXS 0.OOE+00 0.001 ADLGEAXXXU 0.OOE+00 0.001 ADLGEBXXXR 0.OOE+00 0.001 ADLGEBXXXU 0.OOE+00 0.001 ADLGESBOXS 0.OOE+00 0.001 ADLGESBOXU 0.OOE+00 0.001 ALOCALOOP 0.OOE+00 0.001 APMI41AXXR 0.OOE+00 0.001 APMI41BXXR 0.OOE+00 0.001 APM184AXXR 0.OOE+00 0.001 APM184AXXS 0.OOE+00 0.001 AVA452XCCN 0.OOE+00 0.001 BPM5XXXCCS 0.OOE+00 0.001 BPMBXXXXXU 0.OOE+00 0.001 BPMCXXXXXU 0.OOE+00 0.001 BPMEXXXXXU 0.OOE+00 0.001 BPMFXXXXXU 0.OOE+00 0.001 BVM3801XXC 0.OOE+00 0.001 BVM3805XXC 0.OOE+00 0.001 CM 0.OOE+00 0.001 CVC9AXXXXC 0.OOE+00 0.001 CVC9BXXXXC 0.OOE+00 0.001 DBC21 XXCCR 0.OOE+00 0.001 DBCDI INORE 0.OOE+00 0.001 DBCD11XXXU 0.OOE+00 0.001 DBCD 12NORE 0.OOE+00 0.001 DBCD12XXXU 0.OOE+00 0.001 EBCD1IXXXR 0.OOE+00 0.001 EBCD12XXXR 0.OOE+00 0.001 ECBI52504F 0.OOE+00 0.001 ECB152505N 0.OOE+00 0.001 ECB152508L 0.OOE+00 0.001 ECB 152509C 0.OOE+00 0.001 Page 62 of 102

9% tENG REPORT PNPS-RPT-11-oooo1 c-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency ECB152600L 0.OOE+00 0.001 ECB152604F 0.00E+00 0.001 ECB152605N 0.OOE+00 0.001 ECB152608L 0.00E+00 0.001 ECB152609C 0.OOE+00 0.001 ECBI52801C 0.OOE+00 0.001 ECB152802N 0.OOE+00 0.001 ECB5605AXY 0.OOE+00 0.001 ECB5605DXY 0.00E+00 0.001 EDLGEAXXXR 0.OOE+00 0.001 EDLGEBXXXS 0.OOE+00 0.001 EDLGESBOXR 0.OOE+00 0.001 EffX209AXXU 0.OOE+00 0.001 EHX209BXXU 0.OOE+00 0.001 ELOCAHPCIR 0.OOE+00 0.001 ELOCARCICR 0.OOE+00 0.001 EPMI41AXXS 0.OOE+00 0.001 EPMI41BXXS 0.OOE+00 0.001 EPM208AXXS 0.OOE+00 0.001 EPM208BXXS 0.OOE+00 0.001 EPM208EXXS 0.OOE+00 0.001 EPTHPCIXXR 0.OOE+00 0.00 1 EPTRCICXXR 0.OOE+00 0.001 EVA4521XXN 0.OOE+00 0.001 EVA4522XXN 0.OOE+00 0.001 EVM130117C 0.OOE+00 0.001 EVM23015XC 0.OOE+00 0.001 HPMAUXOILS 0.OOE+00 0.001 IPME205XXS 0.OOE+00 0.001 HPTHPCIXXS 0.OOE+00 0.001 HPTHPRCCCR 0.OOE+00 0.001 H-PTHPRCCCS 0.OOE+00 0.001 HSYHPCIMNU 0.OOE+00 0.001 H-VMMO35XXN 0.OOE+00 0.001 HVMMO36XXN 0.OOE+00 0.001 HVMMO3XXXN 0.OOE+00 0.001 HVMMO6XXXC 0.OOE+00 0.001 HVMM4O8XXXN 0.OOE+00 0.001 ILPRCICMNU 0.OOE+00 0.001 IPTRCICXXS 0.OOE+00 0.00 i IPVVACPMPS 0.OOE+00 0.001 IVMINJVCCN 0.OOE+00 0.001 IVMMO49XXN 0.OOE+00 0.001 IVMMO6OXXC 0.OOE+00 0.001 IVMMO61XXN 0.OOE+00 0.001 IVMMO62XXN 0.OOE+00 0.001 P 0.OOE+00 0.001 RH-XE207AXU 0.OOE+00 0.001 RHXE207BXU 0.OOE+00 0.001 RLPSPCOLAU 0.OOE+00 0.001 Page 63 of 102

AN EENG REPORT PNPS-RPT-11-00001 c-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency RLPSPCOLBU 0.00E+00 0.001 RPMABCDCCS 0.OOE+00 0.001 RVC68AXXXC 0.OOE+00 0.001 RVC68BXXXC 0.OOE+00 0.001 RVMIOABCCN 0.OOE+00 0.001 RVM3436CCN 0.OOE+00 0.001 RVM34ABCCN 0.OOE+00 0.001 RVM34AXXXN 0.OOE+00 0.001 RVM34BXXXN 0.OOE+00 0.001 RVM36ABCCN 0.OOE+00 0.001 RVM36AXXXN 0.OOE+00 0.001 RVM36BXXXN 0.OOE+00 0.001 RVM4A6BCCN 0.OOE+00 0.001 RVM4B6ACCN 0.OOE+00 0.001 RVM60ABCCN 0.OOE+00 0.001 SPMABXXCCS 0.OOE+00 0.001 SPMALLXCCS 0.OOE+00 0.001 SPMP208BXU 0.OOE+00 0.001 SPMP208EXU 0.OOE+00 0.001 SVC3880BXN 0.OOE+00 0.001 SVC3880EXN 0.OOE+00 0.001 ETRANSFLAG 1.00E+00 0.001 RVM29AXXXL 0.OOE+00 0.001 RVM29BXXXL 0.OOE+00 0.001 EVM25BXXXL 0.OOE+00 0.001 CVM25AXXXL 0.OOE+00 0.001 JAF-INSERT 4.65E-03 0.001 Page 64 of 102

PN PS-RPT-1 1-00001 at-Entergy ENG REPORT Re-assessment of Pilgrim Seismic Core Damage Frequency System Data File for PILRUN1 .SYS 1 1 CDFALL LMCDF Seauence Data File: PILRIJNI.SEO PIL-SEQI PIL-SEQI 11 1 ESURROGATZ PIL-SEQ2 IPIL-SEQ2 1 1 3

\ESURROGATZ ELOSPXXXXZ CDFALL ALL I Hazard Data File: USGS.HAZ

  • Pilgrim 2008 USGS Hazard Curves* ...HAZHEAD (A40) 1 ...NHAZ 15 ...NPHAZ 1.0 ...PW1 IAZ(I) 0.0148 0.0288 0.0401 0.0771 0.1065 0.1957 0.2610 0.3410 0.5161 0.6283 0.7936 0.9000 1.0464 1.3832 1.8744 6.76E-03 3.12E-03 2.06E-03 8.68E-04 5.55E-04 2.23E-04 1.38E-04 8.57E-05 3.11E-05 1.77E-05 9.51E-06 7.08E-06 4.65E-06 1.96E-06 5.99E-07 Page 65 of 102

ENG REPORT PNPS-RPT-1 1-00001

"!-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency Page 17 RANOPO.BAS SHIP Basic Output No. Damage State Damage State No. of Contributing Sequence Risks Name Risk Sequences (in decreasing order of importance)

I ALL 1.20E-05 2 No. Sequence Name Sequence Risk  % of Total I PIL-SEQ2 9.1 IE-06 76.09 2 PIL-SEQ1 2.86E-06 23.91 Sum: 1.20E-05 100.00 Page 18 RANOPO.BAS SHIP Basic Output Summary of Plant Level Fragility Conditional Probability of Failure PGA (g)

.050 .466

.150 .546

.250 .595

.500 .693

.750 .797

.850 .859

.950 .965 HCLPF (See note) .381 Note: Best Estimate Case HCLPF HCLPF = Ground motion level for which there is a high confidence of a low probability of failure Amed

  • exp( -2.3
  • Beta )

(Assuming the plant fragility is Lognormally distributed, the HCLPF corresponds to a 1.072%

probability of failure)

Page 66 of 102

.'Entey ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation #6 Names File for PILEPRI1.NAM PILEPRI 1.GEN PILEPRIL .SYS PILEPRI 1.CMP PILEPRI 1.SEQ PILEPRI 1.HAZ PILEPRI 1.NAM 05-24-11 Basic Input File for PILEPRI1.GEN Pilgrim SPRA Entergy Nuclear UPDATED EPRI Base CDF EPRICDF1 1 1 2 1 1 1 1 1 1 1 1 129 7 122 1 2 1 nsupcmp,ncomps,ncmpnln,nr,nsys,nseq,ndmg PGA (g) 1 .04 .02 0.98 1290 2

PILEPRI 1.GEN 05-24-11 Page 67 of 102

ANENG REPORT PNPS-RPT-11-00001 tt'Enterg Re-assessment of Pilgrim Seismic Core Damage Frequency Basic Event Data File for PILEPRI I.CMIP ESISLXXXXZ SISL EBAAXXXXXZ 2.11 0.46 0 0 EBABD3XXXZ 2.28 0.46 0 0 EBCD1145XZ 2.11 0.46 0 0 EBCD12-13Z 2.28 0.46 0 0 EBDDGBLDXZ 0.77 0.46 0 0 EBSA5XXXXZ 1.76 0.46 0 0 EBSA600XXZ 2.09 0.46 0 0 EBSA6XXXXZ 2.09 0.46 0 0 EBSA8XXXXZ 0.96 0.29 0.37 0 EBSBIOXXXZ 2.24 0.46 0 0 EBSB1415XZ 1.51 0.46 0 0 EBSB1718XZ 2 0.46 0 0 EBSBIXXXXZ 2 0.46 0 0 EBSB2XXXXZ 0.84 0.46 0 0 EBSB6XXXXZ 2 0.46 0 0 EBSD16XXXZ 2.11 0.46 0 0 EBSD17XXXZ 2.28 0.46 0 0 EBSD4XXXXZ 2.11 0.46 0 0 EBSD5XXXXZ 2.28 0.46 0 0 EBSD7XXXXZ 2 0.46 0 0 EBSY34XXXZ 1.49 0.46 0 0 EBW185/1XZ 1.41 0.46 0 0 EBW 195/23Z 1 0.46 0 0 EBW198/OXZ 2.29 0.46 0 0 EBW198/IXZ 3.43 0.33 0.72 0 EBW 198/2XZ 3.43 0.33 0.72 0 EBW198/3XZ 2.29 0.46 0 0 EBW209/OXZ 0.82 0.46 0 0 EBW209/1 XZ 1.72 0.46 0 0 EBW210/OXZ 1.65 0.34 0.46 0 EBW210/IXZ 1.84 0.46 0 0 EBW210/3XZ 2 0.46 0 0 EBW45/3XXZ 1.07 0.46 0 0 ECBD29XXXZ 2.23 0.46 0 0 ECBD30-3IZ 2.28 0.46 0 0 ECMK103ABZ 1.28 0.46 0 0 ECONTLRODZ 1.55 0.46 0 0 ECOREPLATZ 2.9 0.46 0 0 EDLGEABXXZ 1.39 0.32 0.57 0 EDLGESBOXZ 2 0.46 0 0 EDP2233ABZ 1.49 0.46 0 0 EDPC2258XZ 2.13 0.46 0 0 EDPC5XXXXZ 2.11 0.46 0 0 EDPC6XXXXZ 2.11 0.46 0 0 Page 68 of 102

A-

  • ENG REPORT PN PS-RPT-1 1-00001 ctEntergy Re-assessment of Pilgrim Seismic Core Damage Frequency EDPC93023Z 2.28 0.46 0 0 EDPC93912Z 2.28 0.46 0 0 EDRYWSUPPZ 2.62 0.46 0 0 EDWSHIELDZ 2.04 0.46 0 0 EFN201 ABXZ 1.23 0.46 0 0 EFN202ABXZ 1.23 0.46 0 0 EFN203ABXZ 1.23 0.46 0 0 EFN204ABXZ 0.61 0.46 0 0 EFN204CDXZ 0.61 0.46 0 0 EFN207A-DZ 1.01 0.46 0 0 EFNDWCOOLZ 1.06 0.46 0 0 EFUAXXXXXZ 2.23 0.46 0 0 EFUBXXXXXZ 2.5 0.46 0 0 EFUD3XXXXZ 2.28 0.46 0 0 EFUELCHANZ 3.96 0.46 0 0 EINCORHOUZ 2.75 0.46 0 0 EINTKPANLZ 4.54 0.46 0 0 EISLOCACSZ 0 0.46 0 0 EISLOCRHRZ 0 0.46 0 0 ELOCAHPCIZ 2.5 0.46 0 0 ELOCARCICZ 2.5 0.46 0 0 EPM 141 ABXZ 1.28 0.46 0 0 EPM 184AXXZ 1.05 0.46 0 0 EPM202A-FZ 2.13 0.46 0 0 EPM203A-DZ 2.33 0.46 0 0 EPM208A-EZ 2.32 0.46 0 0 EPTHPCIXXZ 2.33 0.46 0 0 EPTRCICXXZ 2.33 0.46 0 0 ERBTRKLOKZ 3.55 0.46 0 0 ERE12759!Z 0.89 0.31 0.51 0 ERE12769!Z 1.04 0.31 0.51 0 EREI32X9!Z 0.55 0.31 0.51 0 ERE1425B!Z 1.14 0.31 0.51 0 ERE15159!Z 0.89 0.31 0.51 0 ERE15169!Z 1.04 0.31 0.51 0 ERE159X9!Z 0.55 0.31 0.51 0 ERE16059!Z 0.89 0.31 0.51 0 ERE16069!Z 1.04 0.31 0.51 0 ERE18159!Z 0.89 0.31 0.51 0 EREI8169!Z 1.04 0.31 0.51 0 ERE1865X!Z 0.73 0.31 0.51 0 ERE18681!Z 1.34 0.31 0.51 0 ERE18759!Z 0.89 0.31 0.51 0 ERE18769!Z 1.04 0.31 0.51 0 ERE18781 !Z 0.25 0.31 0.51 0 ERE2352X!Z 1.2 0.31 0.51 0 ERE2759X!Z 1.55 0.31 0.51 0 ERE27A5X!Z 0.89 0.31 0.51 0 ERE27A6X!Z 1.04 0.31 0.51 0 Page 69 of 102

A-E t ENG REPORT PN PS-RPT-1 1-00001 c!'Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency ERE32801!Z 1 0.31 0.51 0 ERE40801 !Z 0.67 0.31 0.51 0 ERE46801!Z 0.67 0.31 0.51 0 ERE51N81!Z 1 0.31 0.51 0 ERE51NG8!Z 1 0.31 0.51 0 ERE51V81!Z 1 0.31 0.51 0 ERE59801 !Z 1 0.31 0.51 0 ERINGGIRDZ 2.54 0.46 0 0 ERPVPEDESZ 3.27 0.46 0 0 ERPVSTABLZ 1.52 0.46 0 0 ERWCONCWLZ 1.93 0.46 0 0 ERXBLDDWLZ 3.57 0.46 0 0 ERXBLDFOUZ 1.76 0.46 0 0 ESHDSPGUSZ 2.54 0.46 0 0 ESURROGATZ 1 0.3 0 0 ETBCONCWLZ 3.89 0.46 0 0 ETKI05ABNZ 0.16 0.46 0 0 ETKT105ABZ 0.94 0.46 0 0 ETKT124ABZ 4.81 0.65 0 0 ETKT126ABZ 1.44 0.46 0 0 ETKT201ABZ 2.1 0.46 0 0 ETOPGUIDEZ 2.56 0.46 0 0 ETVX21XXXZ 1.76 0.46 0 0 ETVX22XXXZ 2.77 0.46 0 0 ETVX55XXXZ 1.49 0.46 0 0 EUPLOFLORZ 1.4 0.46 0 0 EVA452122Z 2.9 0.46 0 0 EVESUPSKTZ 6.15 0.46 0 0 EVPEABXXXZ 1.28 0.46 0 0 EVRCABXXXZ 1.28 0.46 0 0 EVS4563ABZ 2.9 0.46 0 0 EVS4563CDZ 2.9 0.46 0 0 EVS4565CDZ 1.28 0.46 0 0 EVS4582ABZ 2.9 0.46 0 0 EVS4582CDZ 2.9 0.46 0 0 ELOSPXXXXZ 0.35 0.55 0 0 EBCDI4XXXY  !

5 0.0000 0.15 0.4999 0.5 2 1.0 2.5e-2 2.50E-02 2.50E-01 5.OOE-01 5.OOE-01 EDLGESBOXY 1 5 0.0000 0.15 0.4999 0.5 2 1.0 3.2e-3 3.20E-03 3.20E-02 5.OOE-01 5.OOE-0 I ELPSPPRPLY 1 5 0.0000 0.15 0.4999 0.5 2 1.0 4.0e-3 4.OOE-03 4.OOE-02 1.00E+00 1.00E+00 ESPCOOLXXY 1 5 0.0000 0.15 0.4999 0.5 2 1.0 5.1e-4 5.1OE-04 5.10E-03 5.OOE-0I 5.OOE-01 ESPC36ABXY I Page 70 of 102

A t ENG REPORT PNPS-RPT-11-00001

'!!-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency 5 0.0000 0.15 0.4999 0.5 2 1.0 5.0e-I 5.00E-01 5.OOE-01 7.50E-01 7.50E-01 ERERESET!Y 1 5 0.0000 0.15 0.4999 0.5 2 1.0 9.OE-2 9.OOE-02 5.OOE-01 5.OOE-01 5.OOE-01 EVMMO45X!Y I 5 0.0000 0.15 0.4999 0.5 2 1.0 6.6E-2 6.60E-02 5.OOE-01 5.OOE-01 5.00E-01 ACB152501F 1.49E-04 0.001 ACB152509L 1.49E-04 0.001 ACB152601F 1.49E-04 0.001 ACB152609L 1.49E-04 0.001 ACB152802F 1.49E-04 0.001 ACB5605CCN 2.21E-05 0.001 ACB5609CCC 8.86E-05 0.001 ADLADL3CCR 2.64E-04 0.001 ADLADLBCCR 2.64E-04 0.001 ADLADLBCCS 4.90E-05 0.001 ADLBDL3CCR 2.64E-04 0.001 ADLGI23CCR 1.32E-05 0.001 ADLGEAXXXS 4.80E-03 0.001 ADLGEAXXXU 1.18E-02 0.001 ADLGEBXXXR 7.92E-03 0.001 ADLGEBXXXU 1.18E-02 0.001 ADLGESBOXS 4.80E-03 0.001 ADLGESBOXU 1.14E-02 0.001 ALOCALOOP i.OOE+00 0.001 APM141AXXR 6.84E-04 0.001 APM141BXXR 6.84E-04 0.001 APM184AXXR 6.84E-04 0.001 APM184AXXS 4.95E-04 0.001 AVA452XCCN 4.OOE-05 0.001 BPM5XXXCCS 4.80E-05 0.001 BPMBXXXXXU 1.09E-02 0.001 BPMCXXXXXU 1.09E-02 0.001 BPMEXXXXXU 1.09E-02 0.001 BPMFXXXXXU 1.09E-02 0.001 BVM3801XXC 1.65E-03 0.001 BVM3805XXC 1.65E-03 0.001 CM 7.50E-06 0.001 CVC9AXXXXC 2.66E-04 0.001 CVC9BXXXXC 2.66E-04 0.001 DBC21XXCCR 1.57E-05 0.001 DBCDI INORE 6.80E-01 0.001 DBCDII XXXU 7.30E-04 0.001 DBCDI2NORE 6.80E-01 0.001 DBCD12XXXU 7.30E-04 0.001 EBCDI IXXXR 2.98E-04 0.001 EBCD12XXXR 2.98E-04 0.001 Page 71 of 102

A EntENG REPORT PN PS-RPT-1 1-00001 Tt-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency ECB152504F 1.49E-04 0.001 ECB152505N 1.99E-04 0.001 ECB152508L 1.49E-04 0.001 ECB152509C 7.97E-04 0.00 1 ECB152600L 1.49E-04 0.001 ECB 152604F 1.49E-04 0.001 ECB I 52605N 1.99E-04 0.001 ECB152608L 1.49E-04 0.001 ECB I 52609C 7.97E-04 0.001 ECB 152801C 1.99E-04 0.001 ECB I52802N 1.99E-04 0.001 ECB5605AXY 1.00E+00 0.001 ECB5605DXY 1.00E+00 0.001 EDLGEAXXXR 7.92E-03 0.001 EDLGEBXXXS 4.80E-03 0.001 EDLGESBOXR 7.92E-03 0.001 EH-X209AXXU 2.66E-02 0.001 EHX209BXXU 2.66E-02 0.001 ELOCAHPCIR 1.23E-04 0.001 ELOCARCICR 1.23E-04 0.001 EPMI41AXXS 4.95E-04 0.001 EPM141BXXS 4.95E-04 0.001 EPM208AXXS 9.20E-03 0.001 EPM208BXXS 9.20E-03 0.001 EPM208EXXS 9.20E-03 0.001 EPTHPCIXXR 1.96E-02 0.001 EPTRCiCXXR 1.96E-02 0.001 EVA4521XXN 1.60E-04 0.001 EVA4522XXN 1.60E-04 0.001 EVMI30117C 1.65E-03 0.001 EVM23015XC 1.65E-03 0.001 HPMAUXOILS 3.OOE-03 0.001 HPME205XXS 3.OOE-03 0.001 HPTHPCIXXS 6.11E-03 0.001 HPTHPRCCCR 3.56E-04 0.001 HPTHPRCCCS 3.90E-04 0.001 HSYHPCIMNU 2.54E-02 0.001 HVMMO35XXN 1.65E-03 0.001 HVMMO36XXN 1.65E-03 0.001 HVMMO3XXXN 1.30E-02 0.001 HVMMO6XXXC 1.65E-03 0.001 HVMMO8XXXN 1.65E-03 0.001 ILPRCICMNU 3.55E-02 0.001 IPTRCICXXS 3.33E-02 0.001 IPVVACPMPS 3.OOE-03 0.001 IVMINJVCCN 1.30E-04 0.001 IVMMO49XXN 1.50E-03 0.001 IVNMMO60XXC 1.65E-03 0.001 IVMMO61XXN 1.50E-03 0.001 Page 72 of 102

is Ente v ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency IVMMO62XXN 1.65E-03 0.001 P 6.80E-03 0.001 RHXE207AXU 5.00E-04 0.001 RI-XE207BXU 5.00E-04 0.001 RLPSPCOLAU 3.OOE-03 0.001 RLPSPCOLBU 3.OOE-03 0.001 RPMABCDCCS 1.70E-05 0.001 RVC68AXXXC 2.66E-04 0.001 RVC68BXXXC 2.66E-04 0.001 RVMIOABCCN 1.30E-04 0.001 RVM3436CCN 1.30E-05 0.001 RVM34ABCCN 3.70E-05 0.001 RVM34AXXXN 1.50E-03 0.001 RVM34BXXXN 1.50E-03 0.001 RVM36ABCCN 3.70E-05 0.001 RVM36AXXXN 1.50E-03 0.001 RVM36BXXXN 1.50E-03 0.001 RVM4A6BCCN 3.70E-05 0.001 RVM4B6ACCN 3.70E-05 0.001 RVM60ABCCN 1.30E-04 0.001 SPMABXXCCS 2.60E-04 0.001 SPMALLXCCS 7.OOE-04 0.001 SPMP208BXU 2.98E-02 0.001 SPMP208EXU 2.98E-02 0.001 SVC3880BXN 1.57E-03 0.001 SVC3880EXN 1.57E-03 0.001 ETRANSFLAG 1.00E+00 0.001 RVM29AXXXL 1.20E-05 0.001 RVM29BXXXL 1.20E-05 0.001 EVM25BXXXL 1.20E-05 0.001 CVM25AXXXL 1.20E-05 0.001 JAF-INSERT 4.65E-03 0.001 PILRUN 1.CMP 5/18/2011 Page 73 of 102

""Entergy ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency System Data File for PILEPRI1.SYS 1 1 CDFALL LMCDF Seauence Data File: PILEPRI1.SEO PIL-SEQI PIL-SEQI 11 1 ESURROGATZ PIL-SEQ2 F,IL-SEQ2 1 1 3

\ESURROGATZ ELOSPXXXXZ CDFALL ALL I Hazard Data File: PILEPRI I.HAZ

  • Pilgrim Updated EPRI Hazard Cur'ves* ..HAZHEAD (A40)

...NHAZ 15 .NPHAZ 1.0 ..PWHAZ(I) 0.001 0.002 0.005 0.01 0.02 0.03 0.05 0.07 0.1 0.2 0.3 0.5 1.0 1.5 2.0 1.15E-04 1.15E-04 1.15E-04 1.15E-04 1.15E-04 1.15E-04 1.15E-04 1.11E-04 1.02E-04 7.20E-05 5.22E-05 2.99E-05 9.54E-06 3.98E-06 1.95E-06 Page 74 of 102

ENG REPORT PNPS-RPT-1 1-00001 ct-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency Page 17 EPRICDF 1.BAS SHIP Basic Output No. Damage State Damage State No. of Contributing Sequence Risks Name Risk Sequences (in decreasing order of importance)

I ALL 2.15E-05 2 No. Sequence Name Sequence Risk  % of Total I PIL-SEQ2 1.90E-05 88.44 2 PIL-SEQI 2.49E-06 11.56 Sum: 2.15E-05 100.00 Page 18 EPRICDF I.BAS SHIP Basic Output Summary of Plant Level Fragility Conditional Probability of Failure PGA (g)

.050 .314

.150 .378

.250 .418

.500 .490

.750 .543

.850 .630

.950 .808 HCLPF (See note) .252 Note: Best Estimate Case HCLPF HCLPF = Ground motion level for which there is a high confidence of a low probability of failure

= Amed

  • exp( -2.3
  • Beta )

(Assuming the plant fragility is Lognormally distributed, the HCLPF corresponds to a 1.072%

probability of failure)

Page 75 of 102

ENG REPORT PNPS-RPT-I 1-00001

t-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation #7 Names File for PILRUNI.NAM PILRUN 1.GEN PILRUN 1.SYS PILRUN I.CMP PILRUNI.SEQ PILEPRI 1.HAZ PILRUN 1.NAM 05-24-11 Basic Input File for PILRUNI .GEN Pilgrim SPRA Boston Edison Company Level 1 PRA RANOPO 1 1 2 1 111 1 129 7 122 1 2 nsupcmp,ncomps,ncmpnln,nr,nsys,nseq,ndmg PGA (g) 1 .04 .01 0.98 1290 2

PILRUN 1.GEN 5-24-11 Page 76 of 102

Sc-Entery ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Basic Event Data File for PILRUNI .CMP ESISLXXXXZ SISL EBAAXXXXXZ 2.11 0.46 0 0 EBABD3XXXZ 2.28 0.46 0 0 EBCD1145XZ 2.11 0.46 0 0 EBCDI2-13Z 2.28 0.46 0 0 EBDDGBLDXZ 1.04 0.46 0 0 EBSA5XXXXZ 1.76 0.46 0 0 EBSA600XXZ 2.09 0.46 0 0 EBSA6XXXXZ 2.09 0.46 0 0 EBSA8XXXXZ 0.96 0.29 0.37 0 EBSBIOXXXZ 2.24 0.46 0 0 EBSBI415XZ 1.51 0.46 0 0 EBSBI718XZ 2 0.46 0 0 EBSB IXXXXZ 2 0.46 0 0 EBSB2XXXXZ 1.13 0.46 0 0 EBSB6XXXXZ 2 0.46 0 0 EBSD16XXXZ 2.11 0.46 0 0 EBSD17XXXZ 2.28 0.46 0 0 EBSD4XXXXZ 2.11 0.46 0 0 EBSD5XXXXZ 2.28 0.46 0 0 EBSD7XXXXZ 2 0.46 0 0 EBSY34XXXZ 1.49 0.46 0 0 EBW185/IXZ 1.41 0.46 0 0 EBW195/23Z 2 0.46 0 0 EBW198/OXZ 2.29 0.46 0 0 EBWI98/IXZ 3.43 0.33 0.72 0 EBW 198/2XZ 3.43 0.33 0.72 0 EBW198/3XZ 2.29 0.46 0 0 EBW209/OXZ 2 0.46 0 0 EBW209/i XZ 1.72 0.46 0 0 EBW210/OXZ 1.65 0.34 0.46 0 EBW210/IXZ 1.84 0.46 0 0 EBW210/3XZ 2 0.46 0 0 EBW45/3XXZ 2 0.46 0 0 ECBD29XXXZ 2.23 0.46 0 0 ECBD30-31Z 2.28 0.46 0 0 ECMKI03ABZ 1.73 0.46 0 0 ECONTLRODZ 1.55 0.46 0 0 ECOREPLATZ 2.9 0.46 0 0 EDLGEABXXZ 1.39 0.32 0.57 0 EDLGESBOXZ 2 0.46 0 0 EDP2233ABZ 1.49 0.46 0 0 EDPC2258XZ 2.13 0.46 0 0 EDPC5XXXXZ 2.11 0.46 0 0 EDPC6XXXXZ 2.11 0.46 0 0 Page 77 of 102

SEntergy ENG REPORT PNPS-RPT-I 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency EDPC93023Z 2.28 0.46 0 0 EDPC93912Z 2.28 0.46 0 0 EDRYWSUPPZ 2.62 0.46 0 0 EDWSHIELDZ 2.04 0.46 0 0 EFN201 ABXZ 2 0.46 0 0 EFN202ABXZ 2 0.46 0 0 EFN203ABXZ 2 0.46 0 0 EFN204ABXZ 2 0.46 0 0 EFN204CDXZ 2 0.46 0 0 EFN207A-DZ 2 0.46 0 0 EFNDWCOOLZ 1.06 0.46 0 0 EFUAXXXXXZ 2.23 0.46 0 0 EFUBXXXXXZ 2.5 0.46 0 0 EFUD3XXXXZ 2.28 0.46 0 0 EFUELCHANZ 3.96 0.46 0 0 EINCORHOUZ 2.75 0.46 0 0 EINTKPANLZ 4.54 0.46 0 0 EISLOCACSZ 0 0.46 0 0 EISLOCRHRZ 0 0.46 0 0 ELOCAHPCIZ 2.5 0.46 0 0 ELOCARCICZ 2.5 0.46 0 0 EPM141ABXZ 1.73 0.46 0 0 EPM 184AXXZ 1.42 0.46 0 0 EPM202A-FZ 2.13 0.46 0 0 EPM203A-DZ 2.33 0.46 0 0 EPM208A-EZ 2.32 0.46 0 0 EPTHPCIXXZ 2.33 0.46 0 0 EPTRCICXXZ 2.33 0.46 0 0 ERBTRKLOKZ 3.55 0.46 0 0 ERE12759!Z 0.89 0.31 0.51 0 ERE12769!Z 1.04 0.31 0.51 0 ERE I32X9!Z 1.5 0.31 0.51 0 ERE1425B!Z 1.14 0.31 0.51 0 EREI5159!Z 0.89 0.31 0.51 0 ERE15169!Z 1.04 0.31 0.51 0 ERE159X9!Z 2.22 0.31 0.51 0 ERE16059!Z 0.89 0.31 0.51 0 ERE16069!Z 1.04 0.31 0.51 0 ERE18159!Z 0.89 0.31 0.51 0 ERE18169!Z 1.04 0.31 0.51 0 EREI865X!Z 0.73 0.31 0.51 0 ERE 1868 H!Z 1.34 0.31 0.51 0 ERE 18759!Z 0.89 0.31 0.51 0 ERE 18769!Z 1.04 0.31 0.51 0 ERE18781!Z 0.25 0.31 0.51 0 ERE2352X!Z 1.2 0.31 0.51 0 ERE2759X!Z 1.55 0.31 0.51 0 ERE27A5X!Z 0.89 0.31 0.51 0 ERE27A6X!Z 1.04 0.31 0.51 0 Page 78 of 102

-ENG A REPORT PNPS-RPT-1 1-00001 z-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency ERE32801!Z 1 0.31 0.51 0 ERE40801 !Z 0.67 0.31 0.51 0 ERE46801!Z 0.67 0.31 0.51 0 ERE51N81!Z 1 0.31 0.51 0 ERE51NG8!Z 1 0.31 0.51 0 ERE51V81!Z 1 0.31 0.51 0 ERE59801!Z 1 0.31 0.51 0 ERINGGIRDZ 2.54 0.46 0 0 ERPVPEDESZ 3.27 0.46 0 0 ERPVSTABLZ 1.52 0.46 0 0 ERWCONCWLZ 1.93 0.46 0 0 ERXBLDDWLZ 3.57 0.46 0 0 ERXBLDFOUZ 1.76 0.46 0 0 ESH-DSPGUSZ 2.54 0.46 0 0 ESURROGATZ 1 0.3 0 0 ETBCONCWLZ 3.89 0.46 0 0 ETK 105ABNZ 5 0.46 0 0 ETKT105ABZ 1.27 0.46 0 0 ETKT124ABZ 4.81 0.65 0 0 ETKT126ABZ 1.44 0.46 0 0 ETKT201ABZ 2.1 0.46 0 0 ETOPGUIDEZ 2.56 0.46 0 0 ETVX21XXXZ 1.76 0.46 0 0 ETVX22XXXZ 2.77 0.46 0 0 ETVX55XXXZ 1.49 0.46 0 0 EUPLOFLORZ 1.4 0.46 0 0 EVA452122Z 2.9 0.46 0 0 EVESUPSKTZ 6.15 0.46 0 0 EVPEABXXXZ 1.73 0.46 0 0 EVRCABXXXZ 1.73 0.46 0 0 EVS4563ABZ 2.9 0.46 0 0 EVS4563CDZ 2.9 0.46 0 0 EVS4565CDZ 1.73 0.46 0 0 EVS4582ABZ 2.9 0.46 0 0 EVS4582CDZ 2.9 0.46 0 0 ELOSPXXXXZ 0.35 0.55 0 0 EBCDi4XXXY 1 2 0.0000 2 1.0 0.0000 0.OOE+00 EDLGESBOXY 1 2 0.0000 2 1.0 0.0000 0.OOE+00 ELPSPPRPLY 1 2 0.0000 2 1.0 0.0000 0.OOE+00 ESPCOOLXXY 1 2 0.0000 2 1.0 0.0000 0.00E+00 ESPC36ABXY I Page 79 of 102

A EENG REPORT PNPS-RPT-1 1-00001 t-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency 2 0.0000 2 1.0 0.0000 0.OOE+00 ERERESET!Y i 2 0.0000 2 1.0 0.0000 O.OOE+00 EVMMO45X!Y 1 2 0.0000 2 1.0 0.0000 0.OOE+00 ACBI52501F 0.OOE+00 0.001 ACB152509L 0.OOE+00 0.001 ACB152601F 0.OOE+00 0.001 ACB 152609L 0.OOE+00 0.001 ACB152802F 0.OOE+00 0.001 ACB5605CCN 0.OOE+00 0.001 ACB5609CCC 0.OOE+00 0.001 ADLADL3CCR 0.OOE+00 0.001 ADLADLBCCR 0.OOE+00 0.001 ADLADLBCCS 0.OOE+00 0.001 ADLBDL3CCR 0.OOE+00 0.001 ADLGI23CCR 0.OOE+00 0.001 ADLGEAXXXS 0.OOE+00 0.001 ADLGEAXXXU 0.OOE+00 0.001 ADLGEBXXXR 0.OOE+00 0.001 ADLGEBXXXU 0.OOE+00 0.001 ADLGESBOXS 0.OOE+00 0.001 ADLGESBOXU 0.OOE+00 0.001 ALOCALOOP 0.OOE+00 0.001 APM141AXXR 0.OOE+00 0.001 APM141BXXR 0.OOE+00 0.001 APM184AXXR 0.OOE+00 0.001 APM I 84AXXS 0.OOE+00 0.001 AVA452XCCN 0.OOE+00 0.001 BPM5XXXCCS 0.OOE+00 0.001 BPMBXXXXXU 0.OOE+00 0.001 BPMCXXXXXU 0.OOE+00 0.001 BPMEXXXXXU 0.OOE+00 0.001 BPMFXXXXXU 0.OOE+00 0.001 BVM3801XXC 0.OOE+00 0.001 BVM3805XXC 0.OOE+00 0.001 CM 0.OOE+00 0.001 CVC9AXXXXC 0.OOE+00 0.001 CVC9BXXXXC 0.OOE+00 0.001 DBC2IXXCCR 0.OOE+00 0.001 DBCDIINORE 0.OOE+00 0.001 DBCDI IXXXU 0.OOE+00 0.001 DBCD12NORE 0.OOE+00 0.001 DBCD12XXXU 0.OOE+00 0.001 EBCDI IXXXR 0.OOE+00 0.001 EBCD12XXXR 0.OOE+00 0.001 Page 80 of 102

is -ENG REPORT PNPS-RPT-1 1-00001

~Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency ECB152504F 0.OOE+00 0.001 ECB 152505N 0.OOE+00 0.001 ECB152508L 0.00E+00 0.001 ECB 152509C 0.00E+00 0.001 ECB152600L 0.OOE+00 0.001 ECB 152604F 0.OOE+00 0.001 ECB 152605N 0.OOE+00 0.001 ECBI52608L 0.OOE+00 0.001 ECB 152609C 0.OOE+00 0.001 ECBI52801C 0.OOE+00 0.001 ECB152802N 0.OOE+00 0.001 ECB5605AXY 0.OOE+00 0.001 ECB5605DXY 0.OOE+00 0.001 EDLGEAXXXR 0.OOE+00 0.001 EDLGEBXXXS 0.OOE+00 0.001 EDLGESBOXR 0.OOE+00 0.001 EHX209AXXU 0.OOE+00 0.001 EHX209BXXU 0.OOE+00 0.001 ELOCAHPCIR 0.OOE+00 0.001 ELOCARCICR 0.OOE+00 0.001 EPMI41AXXS 0.OOE+00 0.001 EPM141BXXS 0.OOE+00 .0.001 EPM208AXXS 0.OOE+00 0.001 EPM208BXXS 0.OOE+00 0.001 EPM208EXXS 0.OOE+00 0.001 EPTHPCIXXR 0.OOE+00 0.001 EPTRCICXXR 0.OOE+00 0.001 EVA4521XXN 0.OOE+00 0.001 EVA4522XXN 0.OOE+00 0.001 EVM130117C 0.OOE+00 0.001 EVM23015XC 0.OOE+00 0.001 HPMAUXOILS 0.OOE+00 0.001 HPME205XXS 0.OOE+00 0.001 HPTHPCIXXS 0.OOE+00 0.001 HPTHPRCCCR 0.OOE+00 0.001 HPTHPRCCCS 0.OOE+00 0.001 HSYHPCIMNU 0.OOE+00 0.001 HVMMO35XXN 0.OOE+00 0.001 HVMMO36XXN 0.OOE+00 0.001 HVMMO3XXXN 0.OOE+00 0.001 HVMMO6XXXC 0.OOE+00 0.001 HVMMO8XXXN 0.OOE+00 0.001 ILPRCICMNU 0.OOE+00 0.001 IPTRCICXXS 0.OOE+00 0.001 IPVVACPMPS 0.OOE+00 0.001 IVMINJVCCN 0.OOE+00 0.001 IVMMO49XXN 0.OOE+00 0.001 IVMMO6OXXC 0.OOE+00 0.001 IVMMO61XXN 0.OOE+00 0.001 Page 81 of 102

IEntergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency IVMMO62XXN 0.O0E+00 0.001 P 0.OOE+00 0.001 RHXE207AXU 0.OOE+00 0.001 RHXE207BXU 0.OOE+00 0.001 RLPSPCOLAU 0.OOE+00 0.001 RLPSPCOLBU 0.OOE+00 0.001 RPMABCDCCS 0.OOE+00 0.001 RVC68AXXXC 0.OOE+00 0.001 RVC68BXXXC 0.OOE+00 0.001 RVM1OABCCN 0.OOE+00 0.001 RVM3436CCN 0.OOE+00 0.001 RVM34ABCCN 0.OOE+00 0.001 RVM34AXXXN 0.OOE+00 0.001 RVM34BXXXN 0.OOE+00 0.001 RVM36ABCCN 0.OOE+00 0.001 RVM36AXXXN 0.OOE+00 0.001 RVM36BXXXN 0.OOE+00 0.001 RVM4A6BCCN 0.OOE+00 0.001 RVM4B6ACCN 0.OOE+00 0.001 RVM60ABCCN 0.OOE+00 0.001 SPMABXXCCS 0.OOE+00 0.001 SPMALLXCCS 0.OOE+00 0.001 SPMP208BXU 0.OOE+00 0.001 SPMP208EXU 0.OOE+00 0.001 SVC3880BXN 0.OOE+00 0.001 SVC3880EXN 0.OOE+00 0.001 ETRANSFLAG 1.00E+00 0.001 RVM29AXXXL 0.OOE+00 0.001 RVM29BXXXL 0.OOE+00 0.001 EVM25BXXXL 0.OOE+00 0.001 CVM25AXXXL 0.OOE+00 0.001 JAF-INSERT 4.65E-03 0.001 PILRUN I.CMP 5/18/2011 Page 82 of 102

a%

!tEntergy ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency System Data File for PILRUN1 .SYS I I CDFALL LMCDF Sequence Data File: PILRUN 1.SEO PIL-SEQI PIL-SEQI 11 1 ESURROGATZ PIL-SEQ2 IPIL-SEQ2 1 1 3

\ESURROGATZ ELOSPXXXXZ CDFALL ALL I Hazard Data File: PILEPRI I.HAZ

  • Pilgrim Updated EPRI Hazard Curves* ..HAZHEAD (A40) 1 ...NHAZ 15 .NPHAZ 1.0 ..PWHAZ(I) 0.001 0.002 0.005 0.01 0.02 0.03 0.05 0.07 0.1 0.2 0.3 0.5 1.0 1.5 2.0 1.15E-04 1.15E-04 1.15E-04 1.15E-04 1.15E-04 1.15E-04 1.15E-04 1.11E-04 1.02E-04 7.20E-05 5.22E-05 2.99E-05 9.54E-06 3.98E-06 1.95E-06 Page 83 of 102

ct-Entergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Page 17 RANOPO.BAS SHIP Basic Output No. Damage State Damage State No. of Contributing Sequence Risks Name Risk Sequences (in decreasing order of importance)

I ALL 8.97E-06 2 No. Sequence Name Sequence Risk  % of Total 1 PIL-SEQ2 6.57E-06 73.19 2 PIL-SEQI 2.41E-06 26.81 Sum: 8.97E-06 100.00 Page 18 RANOPO.BAS SHIP Basic Output Summary of Plant Level Fragility Conditional Probability of Failure PGA (g)

.050 .466

.150 .546

.250 .595

.500 .693

.750 .798

.850 .858

.950 .962 HCLPF (See note) .381 Note: Best Estimate Case HCLPF HCLPF = Ground motion level for which there is a high confidence of a low probability of failure

= Amed

  • exp( -2.3
  • Beta )

(Assuming the plant fragility is Lognormally distributed, the HCLPF corresponds to a 1.072%

probability of failure)

Page 84 of 102

'"Entergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation #8 Names File for P11 CDFI .NAM PILCDF1 .GEN PILCDF1.SYS PILCDF1 .CMP PILCDF1.SEQ PILEPRI 1.HAZ PILCDF1.NAM 05-24-11 Basic Input File for PILCDF1 .GEN Pilgrim SPRA Entergy Nuclear FRAG&BE Data (EPRI)

SCDF1 1 1 2 1 111 1 11 1 129 7 122 1 2 1 nsupcmp,ncomps,ncmpnln,nr,nsys,nseq,ndmg PGA (g) 1 .04 .01 0.98 1290 2

PILCDF 1.GEN 05-24-11 Page 85 of 102

A EENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Basic Event Data File for PILCDF1 .CMP ESISLXXXXZ SISL EBAAXXXXXZ 2.11 0.46 0 0 EBABD3XXXZ 2.28 0.46 0 0 EBCD1145XZ 2.11 0.46 0 0 EBCD12-13Z 2.28 0.46 0 0 EBDDGBLDXZ 1.04 0.46 0 0 EBSA5XXXXZ 1.76 0.46 0 0 EBSA600XXZ 2.09 0.46 0 0 EBSA6XXXXZ 2.09 0.46 0 0 EBSA8XXXXZ 0.96 0.29 0.37 0 EBSB IOXXXZ 2.24 0.46 0 0 EBSB1415XZ 1.51 0.46 0 0 EBSB1718XZ 2 0.46 0 0 EBSBiXXXXZ 2 0.46 0 0 EBSB2XXXXZ 1.13 0.46 0 0 EBSB6XXXXZ 2 0.46 0 0 EBSD16XXXZ 2.11 0.46 0 0 EBSD17XXXZ 2.28 0.46 0 0 EBSD4XXXXZ 2.11 0.46 0 0 EBSD5XXXXZ 2.28 0.46 0 0 EBSD7XXXXZ 2 0.46 0 0 EBSY34XXXZ 1.49 0.46 0 0 EBW185/IXZ 1.41 0.46 0 0 EBW195/23Z 2 0.46 0 0 EBW I98/OXZ 2.29 0.46 0 0 EBW198/1XZ 3.43 0.33 0.72 0 EBW198/2XZ 3.43 0.33 0.72 0 EBW198/3XZ 2.29 0.46 0 0 EBW209/OXZ 2 0.46 0 0 EBW209/1 XZ 1.72 0.46 0 0 EBW210/OXZ 1.65 0.34 0.46 0 EBW210/1XZ 1.84 0.46 0 0 EBW210/3XZ 2 0.46 0 0 EBW45/3XXZ 2 0.46 0 0 ECBD29XXXZ 2.23 0.46 0 0 ECBD30-3 IZ 2.28 0.46 0 0 ECMKI03ABZ 1.73 0.46 0 0 ECONTLRODZ 1.55 0.46 0 0 ECOREPLATZ 2.9 0.46 0 0 EDLGEABXXZ 1.39 0.32 0.57 0 EDLGESBOXZ 2 0.46 0 0 EDP2233ABZ 1.49 0.46 0 0 EDPC2258XZ 2.13 0.46 0 0 Page 86 of 102

!t-Entergy ENG REPORT PN PS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency EDPC5XXXXZ 2.11 0.46 0 0 EDPC6XXXXZ 2.11 0.46 0 0 EDPC93023Z 2.28 0.46 0 0 EDPC93912Z 2.28 0.46 0 0 EDRYWSUPPZ 2.62 0.46 0 0 EDWSHIELDZ 2.04 0.46 0 0 EFN201ABXZ 2 0.46 0 0 EFN202ABXZ 2 0.46 0 0 EFN203ABXZ 2 0.46 0 0 EFN204ABXZ 2 0.46 0 0 EFN204CDXZ 2 0.46 0 0 EFN207A-DZ 2 0.46 0 0 EFNDWCOOLZ 1.06 0.46 0 0 EFUAXXXXXZ 2.23 0.46 0 0 EFUBXXXXXZ 2.5 0.46 0 0 EFUD3XXXXZ 2.28 0.46 0 0 EFUELCHANZ 3.96 0.46 0 0 EINCORHOUZ 2.75 0.46 0 0 EINTKPANLZ 4.54 0.46 0 0 EISLOCACSZ 0 0.46 0 0 EISLOCRIiRZ 0 0.46 0 0 ELOCAHPCIZ 2.5 0.46 0 0 ELOCARCICZ 2.5 0.46 0 0 EPM 141ABXZ 1.73 0.46 0 0 EPM I84AXXZ 1.42 0.46 0 0 EPM202A-FZ 2.13 0.46 0 0 EPM203A-DZ 2.33 0.46 0 0 EPM208A-EZ 2.32 0.46 0 0 EPTHPCIXXZ 2.33 0.46 0 0 EPTRCICXXZ 2.33 0.46 0 0 ERBTRKLOKZ 3.55 0.46 0 0 ERE 12759!Z 0.89 0.31 0.51 0 ERE 12769!Z 1.04 0.31 0.51 0 ERE132X9!Z 1.5 0.31 0.51 0 EREI425B!Z 1.14 0.31 0.51 0 ERE 15159!Z 0.89 0.31 0.51 0 ERE 15169!Z 1.04 0.31 0.51 0 ERE159X9!Z 2.22 0.31 0.51 0 ERE16059!Z 0.89 0.31 0.51 0 ERE 16069!Z 1.04 0.31 0.51 0 ERE 18159!Z 0.89 0.31 0.51 0 EREI8169!Z 1.04 0.31 0.51 0 ERE1865X!Z 0.73 0.31 0.51 0 ERE18681!Z 1.34 0.31 0.51 0 ERE18759!Z 0.89 0.31 0.51 0 ERE18769!Z 1.04 0.31 0.51 0 ERE18781!Z 0.25 0.31 0.51 0 ERE2352X!Z 1.2 0.31 0.51 0 ERE2759X!Z 1.55 0.31 0.51 0 Page 87 of 102

A EENG REPORT PNPS-RPT-1 1-00001 cý'-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency ERE27A5X!Z 0.89 0.31 0.51 0 ERE27A6X!Z 1.04 0.31 0.51 0 ERE32801!Z 1 0.31 0.51 0 ERE40801!Z 0.67 0.31 0.51 0 ERE46801!Z 0.67 0.31 0.51 0 ERE51N81!Z 1 0.31 0.51 0 ERE51NG8!Z 1 0.31 0.51 0 ERE51V81!Z 1 0.31 0.51 0 ERE59801!Z 1 0.31 0.51 0 ERINGGIRDZ 2.54 0.46 0 0 ERPVPEDESZ 3.27 0.46 0 0 ERPVSTABLZ 1.52 0.46 0 0 ERWCONCWLZ 1.93 0.46 0 0 ERXBLDDWLZ 3.57 0.46 0 0 ERXBLDFOUZ 1.76 0.46 0 0 ESHDSPGUSZ 2.54 0.46 0 0 ESURROGATZ 1 0.3 0 0 ETBCONCWLZ 3.89 0.46 0 0 ETK 105ABNZ 5 0.46 0 0 ETKT105ABZ 1.27 0.46 0 0 ETKT124ABZ 4.81 0.65 0 0 ETKT126ABZ 1.44 0.46 0 .0 ETKT201ABZ 2.1 0.46 0 0 ETOPGUIDEZ 2.56 0.46 0 0 ETVX21 XXXZ 1.76 0.46 0 0 ETVX22XXXZ 2.77 0.46 0 0 ETVX55XXXZ 1.49 0.46 0 0 EUPLOFLORZ 1.4 0.46 0 0 EVA452122Z 2.9 0.46 0 0 EVESUPSKTZ 6.15 0.46 0 0 EVPEABXXXZ 1.73 0.46 0 0 EVRCABXXXZ 1.73 0.46 0 0 EVS4563ABZ 2.9 0.46 0 0 EVS4563CDZ 2.9 0.46 0 0 EVS4565CDZ 1.73 0.46 0 0 EVS4582ABZ 2.9 0.46 0 0 EVS4582CDZ 2.9 0.46 0 0 ELOSPXXXXZ 0.35 0.55 0 0 EBCDI4XXXY 1 5 0.0000 0.15 0.4999 0.5 2 1.0 2.5e-2 2.50E-02 2.50E-01 5.OOE-01 5.OOE-01 EDLGESBOXY  !

5 0.0000 0.15 0.4999 0.5 2 1.0 3.2e-3 3.20E-03 3.20E-02 5.OOE-01 5.OOE-0 I ELPSPPRPLY 1 5 0.0000 0.15 0.4999 0.5 2 1.0 4.0e-3 4.OOE-03 4.OOE-02 1.00E+00 1.00E+00 ESPCOOLXXY 1 5 0.0000 0.15 0.4999 0.5 2 Page 88 of 102

IsEntergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency 1.0, 5.1e-4 5.10E-04 5.1OE-03 5.OOE-02 5.OOE-02 ESPC36ABXY 1 5 0.0000 0.15 0.4999 0.5 2 1.0 5.0e- 1 5.OOE-01 5.OOE-01 7.50E-01 7.50E-01 ERERESET!Y  !

5 0.0000 0.15 0.4999 0.5 2 1.0 9.OE-2 9.OOE-02 5.OOE-01 5.O0E-01 5.OOE-01 EVMMO45X!Y 5 0.0000 0.15 0.4999 0.5 2 1.0 6.6E-2 6.60E-02 5.OOE-01 5.OOE-01 5.00E-01I ACB152501F 1.49E-04 0.001 ACB152509L 1.49E-04 0.001 ACB152601F 1.49E-04 0.001 ACB152609L 1.49E-04 0.001 ACB152802F 1.49E-04 0.001 ACB5605CCN 2.21 E-05 0.001 ACB5609CCC 8.86E-05 0.001 ADLADL3CCR 2.64E-04 0.001 ADLADLBCCR 2.64E-04 0.001 ADLADLBCCS 4.90E-05 0.001 ADLBDL3CCR 2.64E-04 0.001 ADLG 123CCR 1.32E-05 0.001 ADLGEAXXXS 4.80E-03 0.001 ADLGEAXXXU 1.18E-02 0.001 ADLGEBXXXR 7.92E-03 0.001 ADLGEBXXXU 1.09E-02 0.001 ADLGESBOXS 4.80E-03 0.001 ADLGESBOXU 1.42E-02 0.001 ALOCALOOP 1.00E+00 0.001 APM141AXXR 6.84E-04 0.001 APMI41BXXR 6.84E-04 0.001 APM 184AXXR 6.84E-04 0.001 APM 184AXXS 4.95E-04 0.001 AVA452XCCN 4.OOE-05 0.001 BPM5XXXCCS 4.80E-05 0.001 BPMBXXXXXU 1.09E-02 0.001 BPMCXXXXXU 1.09E-02 0.001 BPMEXXXXXU 1.09E-02 0.001 BPMFXXXXXU 1.09E-02 0.001 BVM3801XXC 1.65E-03 0.001 BVM3805XXC 1.65E-03 0.001 CM 7.50E-06 0.001 CVC9AXXXXC 2.66E-04 0.001 CVC9BXXXXC 2.66E-04 0.001 DBC2 I XXCCR 1.57E-05 0.001 DBCD I INORE 6.80E-01 0.001 DBCDI IXXXU 7.30E-04 0.001 DBCD I2NORE 6.80E-01 0.001 DBCD 12XXXU 7.30E-04 0.001 Page 89 of 102

A nENG REPORT PNPS-RPT-1 1-00001 t-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency EBCDII XXXR 2.98E-04 0.001 EBCDI2XXXR 2.98E-04 0.001 ECB152504F 1.49E-04 0.001 ECB152505N 1.99E-04 0.001 ECB152508L 1.49E-04 0.001 ECB152509C 7.97E-04 0.001 ECB I 52600L 1.49E-04 0.001 ECB 152604F 1.49E-04 0.001 ECB 152605N 1.99E-04 0.001 ECBI52608L 1.49E-04 0.001 ECB 152609C 7.97E-04 0.001 ECB152801C 1.99E-04 0.001 ECB152802N 1.99E-04 0.001 ECB5605AXY 1.00E+00 0.001 ECB5605DXY 1.00E+00 0.001 EDLGEAXXXR 7.92E-03 0.001 EDLGEBXXXS 4.80E-03 0.001 EDLGESBOXR 7.92E-03 0.001 EHX209AXXU 2.66E-02 0.001 EHX209BXXU 2.66E-02 0.001 ELOCAHPCIR 1.23E-04 0.001 ELOCARCICR 1.23E-04 0.001 EPM141AXXS 4.95E-04 0.001 EPMI41BXXS 4.95E-04 0.001 EPM208AXXS 9.20E-03 0.001 EPM208BXXS 9.20E-03 0.001 EPM208EXXS 9.20E-03 0.001 EPTHPCIXXR 3.93E-03 0.001 EPTRCICXXR 9.78E-03 0.001 EVA452IXXN 1.60E-04 0.001 EVA4522XXN 1.60E-04 0.001 EVM130117C 1.65E-03 0.001 EVM23015XC 1.65E-03 0.001 HPMAUXOILS 3.33E-03 0.001 HPME205XXS 3.OOE-03 0.001 HPTHPCIXXS 3.33E-03 0.001 HPTHPRCCCR 2.31E-07 0.001 HPTHPRCCCS .3.46E-05 0.001 HSYHPCIMNU 1.21E-02 0.001 HVMMO35XXN 1.65E-03 0.001 HVMMO36XXN 1.65E-03 0.001 HVMMO3XXXN 1.03E-03 0.001 HVMMO6XXXC 1.65E-03 0.001 HVMMO8XXXN 1.65E-03 0.001 ILPRCICMNU 8.74E-03 0.001 IPTRCICXXS 3.33E-03 0.001 IPVVACPMPS 3.OOE-03 0.001 IVMINJVCCN 1.30E-04 0.001 IVMMO49XXN 1.50E-03 0.001 Page 90 of 102

--- Entergy ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency IVMMO60XXC 1.65E-03 0.001 IVMMO61XXN 1.50E-03 0.001 IVMMO62XXN 1.65E-03 0.001 P 6.80E-03 0.001 RHXE207AXU 5.OOE-04 0.001 RHXE207BXU 5.OOE-04 0.001 RLPSPCOLAU 3.OOE-03 0.001 RLPSPCOLBU 3.OOE-03 0.001 RPMABCDCCS 1.70E-05 0.001 RVC68AXXXC 2.66E-04 0.00 1 RVC68BXXXC 2.66E-04 0.00 1 RVM1OABCCN 1.30E-04 0.001 RVM3436CCN 1.30E-05 0.001 RVM34ABCCN 3.70E-05 0.001 RVM34AXXXN 1.50E-03 0.001 RVM34BXXXN 1.50E-03 0.001 RVM36ABCCN 3.70E-05 0.001 RVM36AXXXN 1.50E-03 0.001 RVM36BXXXN 1.50E-03 0.001 RVM4A6BCCN 3.70E-05 0.001 RVM4B6ACCN 3.70E-05 0.001 RVM60ABCCN 1.30E-04 0.001.

SPMABXXCCS 2.60E-04 0.001 SPMALLXCCS 1.63E-05 0.001 SPMP208BXU 2.98E-02 0.001 SPMP208EXU 2.98E-02 0.001 SVC3880BXN 1.57E-03 0.001 SVC3880EXN 1.57E-03 0.001 ETRANSFLAG 1.00E+00 0.001 RVM29AXXXL 1.20E-05 0.001 RVM29BXXXL 1.20E-05 0.001 EVM25BXXXL 1.20E-05 0.001 CVM25AXXXL 1.20E-05 0.001 JAF-INSERT 4.65E-03 0.001 PILRUN I .CMP 5/18/2011 Page 91 of 102

ENG REPORT PNPS-RPT-1 1-00001 tt-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency System Data File for PILCDFI .SYS I I CDFALL LMCDF Sequence Data File: PILCDF1.SEQ PIL-SEQI PIL-SEQI 11 1 ESURROGATZ PIL-SEQ2 F,IL-SEQ2 1 1 3

\ESURROGATZ ELOSPXXXXZ CDFALL ALL I Hazard Data File: PILEPRI I.HAZ

  • Pilgrim Updated EPRI Hazard Curves* ..HAZHEAD (A40) 1 ...NHAZ 15 .NPHAZ 1.0 ..PWHAZ(I) 0.001 0.002 0.005 0.01 0.02 0.03 0.05 0.07 0.1 0.2 0.3 0.5 1.0 1.5 2.0 1.15E-04 1.15E-04 1.15E-04 1.15E-04 1.15E-04 1.15E-04 1.15E-04 I.I1E-04 1.02E-04 7.20E-05 5.22E-05 2.99E-05 9.54E-06 3.98E-06 1.95E-06 Page 92 of 102

"Entergy ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Page 17 SCDF I.BAS SHIP Basic Output No. Damage State Damage State No. of Contributing Sequence Risks Name Risk Sequences (in decreasing order of importance)

ALL 1.44E-05 2 No. Sequence Name Sequence Risk  % of Total I PIL-SEQ2 1.20E-05 83.34 2 PIL-SEQi 2.41E-06 16.66 Sum: 1.44E-05 100.00 Page 18 SCDFI.BAS SHIP Basic Output Summary of Plant Level Fragility Conditional Probability of Failure PGA (g)

.050 .401

.150 .470

.250 .495

.500 .572

.750 .685

.850 .754

.950 .889 HCLPF (See note) .326 Note: Best Estimate Case HCLPF HCLPF = Ground motion level for which there is a high confidence of a low probability of failure

= Amed

  • exp( -2.3
  • Beta)

(Assuming the plant fragility is Lognormally distributed, the HCLPF corresponds to a 1.072%

probability of failure)

Page 93 of 102

PNPS-RPT-1 1-00001

=L-Entergy ENG REPORT Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation #9 Names File for PILRUN 1.NAM PILRUN 1.GEN PILRUN 1.SYS PILRUN 1.CMP PILRUNI .SEQ PILEPRI 1.HAZ PILRUN 1.NAM 05-24-11 Basic Innut File for PILRUN1.GEN Pilgrim SPRA Boston Edison Company Level I PRA RANOPO 1 1 2 1 129 7 122 1 2 nsupcmp,ncomps,ncmpnln,nr,nsys,nseq,ndmg PGA (g) 1 .04 .01 0.98 1290 2

PILRUN 1.GEN 5-24-11 Page 94 of 102

SEnt&V ENG REPORT PN PS-RPT-I 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Basic Event Data File for PILRUNI.CMP ESISLXXXXZ SISL EBAAXXXXXZ 2.11 0.46 0 0 EBABD3XXXZ 2.28 0.46 0 0 EBCD1145XZ 2.11 0.46 0 0 EBCD12-13Z 2.28 0.46 0 0 EBDDGBLDXZ 1.04 0.46 0 0 EBSA5XXXXZ 1.76 0.46 0 0 EBSA600XXZ 2.09 0.46 0 0 EBSA6XXXXZ 2.09 0.46 0 0 EBSA8XXXXZ 0.96 0.29 0.37 0 EBSB10XXXZ 2.24 0.46 0 0 EBSB1415XZ 1.51 0.46 0 0 EBSB1718XZ 2 0.46 0 0 EBSB1XXXXZ 2 0.46 0 0 EBSB2XXXXZ 1.13 0.46 0 0 EBSB6XXXXZ 2 0.46 0 0 EBSD16XXXZ 2.11 0.46 0 0 EBSD17XXXZ 2.28 0.46 0 0 EBSD4XXXXZ 2.11 0.46 0 0 EBSD5XXXXZ 2.28 0.46 0 0 EBSD7XXXXZ 2 0.46 0 0 EBSY34XXXZ 1.49 0.46 0 0 EBW185/1XZ 1.41 0.46 0 0 EBW195/23Z 2 0.46 0 0 EBW198/OXZ 2.29 0.46 0 0 EBW198/1XZ 3.43 0.33 0.72 0 EBW198/2XZ 3.43 0.33 0.72 0 EBW198/3XZ 2.29 0.46 0 0 EBW209/OXZ 2 0.46 0 0 EBW209/1XZ 1.72 0.46 0 0 EBW21O/OXZ 1.65 0.34 0.46 0 EBW210/1XZ 1.84 0.46 0 0 EBW210/3XZ 2 0.46 0 0 EBW45/3XXZ 2 0.46 0 0 ECBD29XXXZ 2.23 0.46 0 0 ECBD30-31Z 2.28 0.46 0 0 ECMK103ABZ 1.73 0.46 0 0 ECONTLRODZ 1.55 0.46 0 0 ECOREPLATZ 2.9 0.46 0 0 EDLGEABXXZ 1.39 0.32 0.57 0 EDLGESBOXZ 2 0.46 0 0 EDP2233ABZ 1.49 0.46 0 0 EDPC2258XZ 2.13 0.46 0 0 EDPC5XXXXZ 2.11 0.46 0 0 EDPC6XXXXZ 2.11 0.46 0 0 Page 95 of 102

iEntergy ENG REPORT PNPS-RPT-1 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency EDPC93023Z 2.28 0.46 0 EDPC93912Z 2.28 0.46 0 EDRYWSUPPZ 2.62 0.46 0 EDWSHIELDZ 2.04 0.46 0 EFN201ABXZ 2 0.46 0 EFN202ABXZ 2 0.46 0 EFN203ABXZ 2 0.46 0 EFN204ABXZ 2 0.46 0 EFN204CDXZ 2 0.46 0 EFN207A-DZ 2 0.46 0 EFNDWCOOLZ 1.06 0.46 0 EFUAXXXXXZ 2.23 0.46 0 EFUBXXXXXZ 2.5 0.46 0 EFUD3XXXXZ 2.28 0.46 0 EFUELCHANZ 3.96 0.46 0 EINCORHOUZ 2.75 0.46 0 EINTKPANLZ 4.54 0.46 0 EISLOCACSZ 0 0.46 0 EISLOCRHRZ 0 0.46 0 ELOCAHPCIZ 2.5 0.46 0 ELOCARCICZ 2.5 0.46 0 EPM141ABXZ 1.73 0.46 0 EPM1 84AXXZ 1.42 0.46 0 EPM202A-FZ 2.13 0.46 0 EPM203A-DZ 2.33 0.46 0 EPM208A-EZ 2.32 0.46 0 EPTHPCIXXZ 2.33 0.46 0 EPTRCICXXZ 2.33 0.46 0 ERBTRKLOKZ 3.55 0.46 0 ERE12759!Z 0.89 0.31 0.51 ERE127692Z 1.04 0.31 0.51 ERE132X9!Z 1.5 0.31 0.51 ERE1425B!Z 1.14 0.31 0.51 ERE15159!Z 0.89 0.31 0.51 ERE1 5169!Z 1.04 0.31 0.51 ERE1 59X9!Z 2.22 0.31 0.51 ERE16059!Z 0.89 0.31 0.51 ERE16069!Z 1.04 0.31 0.51 ERE181592Z 0.89 0.31 0.51 ERE18169!Z 1.04 0.31 0.51 ERE1 865X!Z 0.73 0.31 0.51 ERE18681 !Z 1.34 0.31 0.51 ERE187592Z 0.89 0.31 0.51 ERE18769!Z 1.04 0.31 0.51 ERE18781!Z 0.25 0.31 0.51 ERE2352X!Z 1.2 0.31 0.51 ERE2759X!Z 1.55 0.31 0.51 ERE27A5X!Z 0.89 0.31 0.51 ERE27A6X!Z 1.04 0.31 0.51 Page 96 of 102

A-ENG REPORT PNPS-RPT-1 1-00001

ýzEntergy Re-assessment of Pilgrim Seismic Core Damage Frequency ERE32801Z 1 0.31 0.51 0 ERE40801 'Z 0.67 0.31 0.51 0 ERE46801!Z 0.67 0.31 0.51 0 ERE51N81!Z 1 0.31 0.51 0 ERE51NG8!Z 1 0.31 0.51 0 ERE51V81!Z 1 0.31 0.51 0 ERE59801Z 1 0.31 0.51 0 ERINGGIRDZ 2.54 0.46 0 0 ERPVPEDESZ 3.27 0.46 0 0 ERPVSTABLZ 1.52 0.46 0 0 ERWCONCWLZ 1.93 0.46 0 0 ERXBLDDWLZ 3.57 0.46 0 0 ERXBLDFOUZ 1.76 0.46 0 0 ESHDSPGUSZ 2.54 0.46 0 0 ESURROGATZ 1 0.3 0 0 ETBCONCWLZ 3.89 0.46 0 0 ETK105ABNZ 5 0.46 0 0 ETKT105ABZ 1.27 0.46 0 0 ETKT124ABZ 4.81 0.65 0 0 ETKT126ABZ 1.44 0.46 0 0 ETKT201ABZ 2.1 0.46 0 0 ETOPGUIDEZ 2.56 0.46 0 0 ETVX21XXXZ 1.76 0.46 0 0 ETVX22XXXZ 2.77 0.46 0 0 ETVX55XXXZ 1.49 0.46 0 0 EUPLOFLORZ 1.4 0.46 0 0 EVA452122Z 2.9 0.46 0 0 EVESUPSKTZ 6.15 0.46 0 0 EVPEABXXXZ 1.73 0.46 0 0 EVRCABXXXZ 1.73 0.46 0 0 EVS4563ABZ 2.9 0.46 0 0 EVS4563CDZ 2.9 0.46 0 0 EVS4565CDZ 1.73 0.46 0 0 EVS4582ABZ 2.9 0.46 0 0 EVS4582CDZ 2.9 0.46 0 0 ELOSPXXXXZ 0.35 0.55 0 0 EBCD14XXXY 1 2 0.0000 2 1.0 0.0000 0.OOE+00 EDLGESBOXY 1 2 0.0000 2 1.0 0.0000 0.OOE+00 ELPSPPRPLY 1 2 0.0000 2 1.0 0.0000 0.OOE+00 ESPCOOLXXY 1 2 0.0000 2 1.0 0.0000 0.OOE+00 ESPC36ABXY 1 Page 97 of 102

PNPS-RPT-I 1-00001 tEntergy ENG REPORT Re-assessment of Pilgrim Seismic Core Damage Frequency 2 0.0000 2 1.0 0.0000 0.OOE+00 ERERESET!Y 1 2 0.0000 2 1.0 0.0000 0.OOE+00 EVMMO45X!Y 1 2 0.0000 2 1.0 0.0000 0.OOE+00 ACB152501F 0.OOE+00 0.001 ACB1 52509L 0.OOE+00 0.001 ACB152601F 0.OOE+00 0.001 ACB1 52609L 0.OOE+00 0.001 ACB1 52802F 0.OOE+00 0.001 ACB5605CCN 0.OOE+00 0.001 ACB5609CCC 0.OOE+00 0.001 ADLADL3CCR 0.OOE+00 0.001 ADLADLBCCR 0.OOE+00 0.001 ADLADLBCCS 0.OOE+00 0.001 ADLBDL3CCR 0.OOE+00 0.001 ADLG123CCR 0.OOE+00 0.001 ADLGEAXXXS 0.OOE+00 0.001 ADLGEAXXXU 0.OOE+00 0.001 ADLGEBXXXR 0.OOE+00 0.001 ADLGEBXXXU 0.OOE+00 0.001 ADLGESBOXS 0.OOE+00 0.001 ADLGESBOXU 0.OOE+00 0.001 ALOCALOOP 0.OOE+00 0.001 APM141AXXR 0.OOE+00 0.001 APM141BXXR 0.OOE+00 0.001 APM184AXXR 0.OOE+00 0.001 APM184AXXS 0.OOE+00 0.001 AVA452XCCN 0.OOE+00 0.001 BPM5XXXCCS 0.OOE+00 0.001 BPMBXXXXXU 0.OOE+00 0.001 BPMCXXXXXU 0.OOE+00 0.001 BPMEXXXXXU 0.OOE+00 0.001 BPMFXXXXXU 0.OOE+00 0.001 BVM3801XXC 0.OOE+00 0.001 BVM3805XXC 0.OOE+00 0.001 CM 0.OOE+00 0.001 CVC9AXXXXC 0.OOE+00 0.001 CVC9BXXXXC 0.OOE+00 0.001 DBC21XXCCR 0.OOE+00 0.001 DBCD11NORE 0.OOE+00 0.001 DBCD1 1XXXU 0.OOE+00 0.001 DBCD12NORE 0.OOE+00 0.001 DBCD12XXXU 0.OOE+00 0.001 EBCD1 1XXXR 0.OOE+00 0.001 EBCD12XXXR 0.OOE+00 0.001 Page 98 of 102

A ENG REPORT PNPS-RPT-1 1-00001 Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency ECB152504F 0.OOE+00 0.001 ECB1 52505N 0.OOE+00 0.001 ECB152508L 0.OOE+00 0.001 ECB152509C 0.OOE+00 0.001 ECB1 52600L 0.OOE+00 0.001 ECB1 52604F 0.00E+00 0.001 ECB1 52605N 0.OOE+00 0.001 ECB1 52608L 0.OOE+00 0.001 ECB1 52609C 0.OOE+00 0.001 ECB152801C 0.OOE+00 0.001 ECB152802N 0.OOE+00 0.001 ECB5605AXY 0.OOE+00 0.001 ECB5605DXY 0.OOE+00 0.001 EDLGEAXXXR 0.OOE+00 0.001 EDLGEBXXXS 0.OOE+00 0.001 EDLGESBOXR 0.OOE+00 0.001 EHX209AXXU 0.OOE+00 0.001 EHX209BXXU 0.OOE+00 0.001 ELOCAHPCIR 0.OOE+00 0.001 ELOCARCICR 0.OOE+00 0.001 EPM141AXXS 0.OOE+00 0.001 EPM141BXXS 0.OOE+00 0.001 EPM208AXXS 0.OOE+00 0.001 EPM208BXXS 0.OOE+00 0.001 EPM208EXXS 0.OOE+00 0.001 EPTHPCIXXR 0.OOE+00 0.001 EPTRCICXXR 0.OOE+00 0.001 EVA4521XXN 0.OOE+00 0.001 EVA4522XXN 0.OOE+00 0.001 EVM1330117C 0.OOE+00 0.001 EVM23015XC 0.OOE+00 0.001 HPMAUXOILS 0.OOE+00 0.001 HPME205XXS 0.OOE+00 0.001 HPTHPCIXXS 0.OOE+00 0.001 HPTHPRCCCR 0.OOE+00 0.001 HPTHPRCCCS 0.OOE+00 0.001 HSYHPCIMNU 0.OOE+00 0.001 HVMMO35XXN 0.OOE+00 0.001 HVMMO36XXN 0.OOE+00 0.001 HVMMO3XXXN 0.OOE+00 0.001 HVMMO6XXXC 0.OOE+00 0.001 HVMMO8XXXN 0.OOE+00 0.001 ILPRCICMNU 0.OOE+00 0.001 IPTRCICXXS 0.OOE+00 0.001 IPWACPMPS 0.OOE+00 0.001 IVMINJVCCN 0.OOE+00 0.001 IVMMO49XXN 0.OOE+00 0.001 IVMMO6OXXC 0.OOE+00 0.001 IVMMO61XXN 0.OOE+00 0.001 Page 99 of 102

SEntergy ENG REPORT PN PS-RPT-I 1-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency IVMMO62XXN 0.OOE+00 0.001 P 0.OOE+00 0.001 RHXE207AXU 0.00E+00 0.001 RHXE207BXU 0.00E+00 0.001 RLPSPCOLAU 0.OOE+00 0.001 RLPSPCOLBU 0.OOE+00 0.001 RPMABCDCCS 0.OOE+00 0.001 RVC68AXXXC 0.OOE+00 0.001 RVC68BXXXC 0.OOE+00 0.001 RVM10ABCCN 0.OOE+00 0.001 RVM3436CCN 0.OOE+00 0.001 RVM34ABCCN 0.OOE+00 0.001 RVM34AXXXN 0.OOE+00 0.001 RVM34BXXXN 0.OOE+00 0.001 RVM36ABCCN 0.OOE+00 0.001 RVM36AXXXN 0.OOE+00 0.001 RVM36BXXXN 0.OOE+00 0.001 RVM4A6BCCN 0.OOE+00 0.001 RVM4B6ACCN 0.OOE+00 0.001 RVM60ABCCN 0.OOE+00 0.001 SPMABXXCCS 0.OOE+00 0.001 SPMALLXCCS 0.OOE+00 0.001 SPMP208BXU 0.OOE+00 0.001 SPMP208EXU 0.OOE+00 0.001 SVC3880BXN 0.OOE+00 0.001 SVC3880EXN 0.OOE+00 0.001 ETRANSFLAG 1.OOE+00 0.001 RVM29AXXXL 0.OOE+00 0.001 RVM29BXXXL 0.OOE+00 0.001 EVM25BXXXL 0.OOE+00 0.001 CVM25AXXXL 0.OOE+00 0.001 JAF-INSERT 4.65E-03 0.001 PILRUN1.CMP 5/18/2011 Page 100 of 102

ENG REPORT PNPS-RPT-1 1-00001 t--Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency System Data File for PILRUN 1 .SYS 1 I CDFALL LMCDF Sequence Data File: PILRUNI .SEO PIL-SEQI PIL-SEQI I1 1 ESURROGATZ PIL-SEQ2 T9IL-SEQ2 1 1 3

\ESURROGATZ ELOSPXXXXZ CDFALL ALL I Hazard Data File: PILEPRII .HAZ

  • Pilgrim Updated EPRI Hazard Curves* ..HAZHEAD (A40)

...NHAZ 15 .NPHAZ 1.0 ..PWHAZ(I) 0.001 0.002 0.005 0.01 0.02 0.03 0.05 0.07 0.1 0.2 0.3 0.5 1.0 1.5 2.0 1.15E-04 1.15E-04 1.15E-04 1.15E-04 1.15E-04 1.15E-04 1.15E-04 1.1IE-04 1.02E-04 7.20E-05 5.22E-05 2.99E-05 9.54E-06 3.98E-06 1.95E-06 Page 101 of 102

ENG REPORT PNPS-RPT-11-00001

'=-EnterAY Re-assessment of Pilgrim Seismic Core Damage Frequency Page 17 RANOPO.BAS SHIP Basic Output No. Damage State Damage State No. of Contributing Sequence Risks Name Risk Sequences (in decreasing order of importance)

ALL 8.97E-06 2 No. Sequence Name Sequence Risk  % of Total I PIL-SEQ2 6.57E-06 73.19 2 PIL-SEQI 2.41E-06 26.81 Sum: 8.97E-06 100.00 Page 18 RANOPO.BAS SHIP Basic Output Summary of Plant Level Fragility Conditional Probability of Failure PGA (g)

.050 .466

.150 .546

.250 .595

.500 .693 750 .798

.850 .858 950 .962 HCLPF (See note) .381 Note: Best Estimate Case HCLPF HCLPF = Ground motion level for which there is a high confidence of a low probability of failure

= Amed

  • exp( -2.3
  • Beta)

(Assuming the plant fragility is Lognormally distributed, the HCLPF corresponds to a 1.072%

probability of failure)

Page 102 of 102

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