ML14086A502

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
From:	Nuta D A Entergy Nuclear Operations
To:	Office of Nuclear Reactor Regulation
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2.14.027 PNPS-RPT-11-00001, Rev. 0
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ENCLOSURE I TOPNPS Letter 2.14.027Entergy Nuclear Engineering Report No. PNPS-RPT-11-00001, "Re-assessment of Pilgrim Seismic Core Damage Frequency" June 2011 ENTERGY NUCLEAREngineering White PaperEngineering Report NoPNPS-RPT-1 1-00001Rev. 0ReAsssmn of PilriSesi Cor Damg Frequency

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SEntergyENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency TABLE OF CONTENTS1.0 EXECUTIVE SUMMARY ................................................................

42 .0 P U R P O S E .................................................................................

43 .0 B A C K G R O U N D ...........................................................................

54.0 DEFINITIONS AND ACRONYMS

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64 .1 D e fi n itio n s .....................................................

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64 .2 A cro n ym s .....................................................

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75.0 GENERAL DISCUSSION

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95.1 Assessment Approach

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95.2 NRC Review Results .........................................................

126 .0 E V A LU A T IO N S ...........................................................................

136.1 NRC Methodology in Determining SCDF ...............................

136.2 Methodology that Emulates NRC's Results .............................

146.3 USGS Hazard Curves for PNPS ...........................................

156.4 Identification of Margin ........................................................

166.4.1 Identification of Low Capacity Components

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166.4.2 In-Structure Response Spectra .................................

236.4.3 Review of Capacities of Relays ...............................

236.4.4 Review of Capacities of Block Walls ...........

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256.4.5 Review of Capacities of Other Components

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266.4.6 Revised Fragilities

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266.5 Re-Assessment of SCDF ..................................................

3

27.0 CONCLUSION

S

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348.0 RECOMMENDATIONS

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348.1 Short term Recommendations

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348.2 Long term Recommendations

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3

49.0 REFERENCES

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3510.0 ATTACHMENTS

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3611.0 TEAM MEMBERS .......................................................................

36Sheet 3 of 36 SEntergyENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency 1.0 EXECUTIVE SUMMARYRecent NRC Safety/Risk Assessment of US Nuclear Plant Seismic Core DamageFrequencies based on the 2008 US Geological Survey (USGS) Seismic Hazard Curvesused 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 thesecond-largest calculated Seismic Core Damage Frequency (SCDF). Since the PilgrimIPEEE work included conservatisms, Entergy assembled a Seismic Review Teamtasked with developing an SCDF estimate that more closely reflects the robustness ofthe Pilgrim Plant.Although the NRC-estimated SCDF was below the target goal of 1.OE-04 per year, andthus acceptable in terms of the plant seismic risk, the review team re-assessed keyPNPS components and demonstrated a larger plant-level seismic capacity than thatused in the NRC assessment.

The NRC used values for plant capacity extracted fromthe PNPS IPEEE report submitted in 1994. This resulted in the NRC determining aconservative SCDF estimate of 6.9E-05 per year, or 1 in 14,493 reactor-years.

Usingthe improved plant level capacities developed by the team a re-assessment of theSCDF estimate was performed.

This resulted in a SCDF of 3.98E-05 per year, or 1 in25,126 reactor-years, using the same USGS Hazard Curves relied upon by NRC for theseismic risk assessment.

Using the improved plant level capacity developed by the review team and the EPRIupdated 2010 Seismic Hazard Curves [9.12], the SCDF estimate is further reduced to1.46E-05 per year (or 1 in 68,493 reactor-years).

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

Sheet 4 of 36 SEntergENGINEERING 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 EasternUnited States (CEUS) region may have increased for some sites. Based on theevaluations of the Individual Plant Examination of External Events (IPEEE) Program,the NRC had determined that seismic designs of operating plants in the CEUS providedan adequate level of protection.

However, in light of the preliminary results from thereview 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 theCEUS may be higher than previously thought.

Therefore, the NRC initiated GenericIssue GI-199 to assess the impact of increased estimates of seismic hazards onselected current nuclear power plants in the CEUS region that might be impacted by theupdated seismic research, information, and models.On 09/02/10, the NRC issued Safety/Risk Assessment (SRA) results for Generic Issue199, "Implications of Updated Probabilistic Seismic Hazard Estimates in Central andEastern United States on Existing Plants" [9.3]. The SRA consists of three separateevaluations performed using, respectively, the 1989 Electric Power Research Institute (EPRI), 1994 Lawrence Livermore National Laboratory (LLNL), and the updated 2008U.S. Geological Survey (USGS) seismic hazard curves to calculate the SCDF for allU.S. nuclear plants. The results of the GI-199 assessment raised the possibility that theprobability of exceeding the design basis ground motion may have increased at somesites, but only by a relatively small amount. The NRC concluded that "no concern existsregarding adequate protection and that the current seismic design of operating reactorsprovides a safety margin to withstand potential earthquakes exceeding the originaldesign 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 therange of 1.OE-04 per year to 1.OE-05 per year, NRC decided that the issue will proceedto the Regulatory Assessment Stage of the Generic Issues Program.

It should be notedthat the NRC-DOE-EPRI team is developing a new CEUS seismic source model, andthe 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 aconservative, screening-level assessment to evaluate if further investigations of seismicsafety for operating reactors in the CEUS are warranted consistent with NRC directives.

Sheet 5 of 36 SEntergyENGINEERING 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 andplant-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 theU.S. nuclear plants (SCDF estimate of 6.9E-05 per year) using the 2008 updated USGSSeismic Hazard Curves [9.7] for the PNPS site. Note that this is still within the rangeconsidered 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 haveresulted in an overly conservative (high) SCDF estimate.

As a result of the Tohoku-Taiheiyou-Oki Earthquake in Japan and its effect on theFukushima Daiichi Nuclear Station, increased attention has been directed to nuclearplants [9.4, 9.6] and in particular PNPS's ability to withstand an earthquake withoutsuffering core damage.4.0 DEFINITIONS

& ACRONYMS4.1 Definitions

• Composite Uncertainty (11) -The composite logarithmic standard deviation ofthe capacity about the best-estimate, or median value. It represents thevariation due to both inherent randomness (Ar) and uncertainty (Pu).* Fragility

-The conditional probability of failure as a function of a groundmotion parameter (for example, peak ground acceleration).

• High Confidence of a Low Probability of Failure (HCLPF) -The groundmotion parameter (for example, peak ground acceleration) at which there is atleast 95% confidence of less than 5% probability of failure (for example, coredamage).* Median Capacity (Am or C50) -The ground motion parameter (for example,peak ground acceleration) for which there is a 50% probability of failure (forexample, core damage).Sheet 6 of 36 zEntergyENGINEERING 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 siteearthquake-induced vibratory ground motion.* Seismic Core Damaae Frequency (SCDF) -The expected frequency of coredamage caused by earthquake ground motion (expressed as occurrences perreactor-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 motionparameter (for example, peak ground acceleration)

• Seismic Hazard Map -A seismic hazard map displays an earthquake groundmotion parameter (for example, peak ground acceleration) for a specificprobability of occurrence at many locations (for example, across the UnitedStates).

Seismic hazard maps are derived from seismic hazard curvescalculated for a grid of sites across the United States." Surrogate Element -Element used to represent all of the components withrelatively high seismic capacity.

• Uniform Hazard Spectrum (UHS) -A plot of the maximum acceleration of asingle-frequency system over a range of frequencies for a ground motion witha 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* CRD -Control Rod Drive* EDG -Emergency Diesel Generator

• EPRI -Electric Power Research Institute

• ESP -Early Site PermitSheet 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* HPCI -High Pressure Coolant Injection

• IPEEE -Individual Plant Examination of External Events* ISRS -In-Structure Response Spectra" LLNL -Lawrence Livermore National Laboratory.

" LOCA -Loss of Coolant Accident* LOOP or LOSP -Loss of Off-Site Power* LPCI -Low Pressure Coolant Injection

• 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* RCIC -Reactor Core Isolation Cooling* RCP -Reactor Coolant Pump* RHR -Residual Heat Removal* RPV -Reactor Pressure Vessel* SBO -Station BlackoutSheet 8 of 36

'EntergyENGINEERING 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

• SPRA -Seismic Probabilistic Risk Assessment

• SRA -Safety/Risk Assessment

• SSE -Safe Shutdown Earthquake

• 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 ApproachThe 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 IPEEEcomponent fragility values. The plant-level fragility value is expected toincrease.

" Exploring, and where appropriate, reducing conservatism in the USGSSeismic Hazard Curves. For example, the USGS seismic hazard calculations did not include Cumulative Absolute Velocity (CAV) filtering and groundmotion incoherence, which tend to reduce the acceleration values.Sheet 9 of 36 SEntergyENGINEERING 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 actionfailure probability to align suppression pool cooling and removal of ReactorBuilding quad coolers requirements (for RHR A/B quadrant, CRD quadrant, and HPCI room) in the SPRA model. It should be noted that the 2002GOTHIC 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 areacoolers during the mission time. Table 5.1 below provides a summary ofthese changes -(See Attachment 10.7).* Fully understanding the methodology used by NRC in developing the SCDFestimates reported in [9.3], and subsequently, developing a method thatemulates the NRC's approach and duplicates the NRC results, as described in Attachment 10.2. This methodology was used to obtain revised SCDFestimates based on the peak ground acceleration (PGA) and the 10 Hz, 5 Hz,and 1 Hz hazard curves. The revised SCDF reflected changes in seismicfragilities, random failure probabilities, operation action failure probabilities, orsystem modeling changes as described in the previous bullet above.* Developing recommendations for short-term and long-term actions to improvethe seismic risk estimates to more accurately reflect the robustness of theplant.Sheet 10 of 36 SEntergyENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Table 5.1Summary of Pilgrim SPRA Basic Events ChangesBasic Event Descrtion Probability (3)Name Old (1) NewEPTHPCIXXR 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 SEntergyENGINEERING 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 151ESPCOOLXXY 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 pumpsA/B/C/D, CRD pumps and HPCI were not impacted by the loss of RHR LoopA/B quad coolers during the mission time. Hence, a value of 2.Og is assumedfor 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 ResultsThe results of the NRC analysis described in Section 6.1, for PNPS are summarized below Table 5.2:Table 5.2NRC Results for SCDFSEISMIC CORE DAMAGE FREQUENCY INCREASE INCREASEPLANT WEAKEST LINK2008 USGS 1989 EPRI 1994 LLNL USGS-EPRI USGS-LLNL PNPS 6.9E-05 8.OE-06 1.1E-04 6.1E-05 -4.1E-051 in 14,500 yrs 1 in 125,000 yrs 1 in 9,091 yrsThe 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 becausesome 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 inSCDF is positive for USGS-EPRI and negative for USGS-LLNL.

Sheet 12 of 36 SEntergyENGINEERING 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 furtherreview. 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 SCDFThe SCDF is calculated as:SCDF = fPa _ clkwhere P(a) is the plant-level fragility function and H(a) is the seismic hazard curve. Theequation is evaluated numerically.

The fragility function used by the NRC was characterized by a median capacity, Am, anda composite uncertainty, Pc. The NRC derived these parameters from the IPEEEsubmittals for each plant. The submittal information varied from plant to plant;therefore, the NRC used different methods for different plants. The different methodsare defined in Table C-1 of Appendix C of [9.3]. The method used for each plant islisted in Table C-2 of Appendix C of [9.3].The method used for PNPS was supposed to take the median capacity, C50, andHCLPF from the IPEEE submittal and calculate Pc as 13c = ln(C5o/HCLPF)/2.33.

" The NRC lists 0.49g for median capacity, C50, in Table C-2. The number given inTable 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 PNPSHCLPF is listed as 0.25g in Table 3-13. Using C50 = 0.48g and HCLPF = 0.25ggives Pc = 0.28. Using C50 = 0.49g and HCLPF = 0.25g gives Pc = 0.29. Neitherof these is the same as 0.27. Use of C50 = 0.49g and Pc = 0.27 give HCLPF =0.26g.Sheet 13 of 36 SEntergyENGINEERING 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 withPNPS 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: USGS2008, EPRI 1989 and LLNL 1993. Each set had individual hazard curves for PGA, 10Hz, 5 Hz and 1 Hz. For a given set the NRC calculated the SCDF corresponding toeach 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 foreach 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 TableD-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 USGS2008 hazard and the SCDFs for the EPRI 1989 and LLNL 1994 hazards to select plantsfor further review. PNPS was not selected because the SCDF based on the USGS2008 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 interms of PGA. In order to calculate the SCDF for the 10 Hz, 5 Hz or 1 Hz SeismicHazard Curves, the fragilities must be changed to be in terms of the spectralacceleration at that frequency.

This was done by multiplying the median capacityacceleration, C50, by a spectral ratio, m. The spectral ratios for all of the plants aregiven in Table C2 of Appendix C of the GI-199 SRA [9.3] (and are also discussed inAttachment 10.2).6.2 Methodology That Emulates NRC's ResultsA full understanding of the methodology used in the NRC report was achieved.

TheNRC SRA results were duplicated, validating our understanding.

The samemethodology 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 whichthe acceleration interval was refined using a log-log interpolation between the rawSheet 14 of 36 SEntergyENGINEERING 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 thePGA, 10 Hz, 5 Hz, and 1Hz Hazard Curves showing the 0.001g discretization for eachhazard curve are presented in Attachments 10.2 and 10.5.The SCDF results obtained using the methodologydescribed above, with the USGSHazard Curve and PNPS fragility used by the NRC, match those reported in the NRCGI-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 inAttachments 10.3 and 10.5.6.3 USGS Hazard Curves for PNPSIn 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 StatesGeological Survey (USGS) for the PNPS plant site. The curves were obtained fromNRC [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 inevent frequency to represent the observation that some fraction of earthquake groundmotions 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 isbelieved that if the CAV threshold effect were to be incorporated in the seismic hazardanalysis, the hazard curves would be lowered and the SCDF would decrease as aresult. However, it is not possible to incorporate the effect within the scope of thisassessment beyond calculating SCDF values using the EPRI Seismic Hazard Curves.EPRI performed an independent seismic hazard analysis.

The results have not beenpublicly

released, but EPRI provided its hazard results to Entergy.

These hazardanalysis included consideration of the CAV threshold effect. Therefore, SCDFcalculations will also be done using the EPRI updated curves [9.12] for comparison tothe SCDF calculations using the USGS curves.Sheet 15 of 36 SEntergyENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency 6.4 Identification of Margin6.4.1 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 coredamage sequence is a seismic-induced loss-of-offsite power (LOSP) and thesubsequent 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 relaychattering failures associated with both emergency diesel generators (EDG) and theSBO diesel. Other contributors are loss of the condensate storage tank (due to systeminteraction with the nitrogen supply tank) and diesel generator building structural failure.In addition to seismic related faults, non seismic failures that contribute to this sequenceinvolve operator action failure to reset SBO diesel-related relays and failure to completeSBO diesel start procedure.

The second-highest sequence contributing to the seismic CDF involves LOSP andfailure to provide containment decay heat removal.

This sequence contributes 2.09E-05per year, or 35.9% of the total seismic CDF. The loss of containment decay heatremoval involves failure of the RHR system or failure of systems that support the RHRsystem (these include loss of RHR pumps quadrant room cooling, Reactor BuildingClosed Cooling Water (RBCCW) system surge tank and pumps failures, SSW pumpsfailure, 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 alignfor suppression pool cooling and failure to complete SBO diesel start procedure.

The third and fourth dominant sequences involve the occurrence of a small break LOCAand subsequent loss of RPV injection or containment decay heat removal.

Thesesequences contribute 5.90E-06 per year, or 10.1% of the total seismic CDF. Thesesequences are identical to dominant seismic sequence one and two above except forthe occurrence of small break LOCA and involve the occurrence of small LOCA andsubsequent 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 RPVpressure, loss of containment heat removal, small LOCA with high pressure makeupSheet 16 of 36 SEntergyENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency

failure, small LOCA with containment control failure, surrogate element (elementrepresenting all components with relatively high seismic capacity),

vessel rupture, andanticipated transient without scram (ATWS). Their mean contributions to the seismiccore damage frequency for events up to seismic failure of the surrogate element aresummarized below in Table 6.1:Table 6.1Events and Contribution to SCDF from IPEEESeismicAccident Initiating Key Seismic Contributing Per year Mean Contribution Sequence Event(s)

Components CDF to SCDFLOSP/Loss of Electrical faults, seismic1 interactions, and DG 2.72E-05 46.7 %building failurePumps (RHR, RBCCW, and2 LOSP/RHR SSW), RBCCW surge tank, 2.09E-05 35.9 %and Electrical faults3 SmallLOCAs Same as above sequences 5.90E-06 10.1 %1 & 24 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 byreviewing 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 othersequences which resulted in significant risk contribution to the SCDF, and with IPEEE-calculated fragility levels below the surrogate element.

In this approach a selection ofthe low capacity components were reviewed to ascertain if conservatisms exist, and ifthe findings, on a sample basis, are applicable to the remaining low capacitycomponents 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 thecomponents in the model with a median capacity lower than the surrogate.

The mediancapacity was increased to 2g to reflect the component seismic contribution to riskwithout having to modify the SHIP model, and the model was run to calculate a newSCDF. The reduction in SCDF was recorded.

The components were then ranked inorder of the percentage reduction in SCDF attributable just to reduced conservatism inthat one component fragility.

The results are shown in Table 6.2 below.Table 6.2Components Ranked by Potential Reduction in SCDFNumber Component Median Beta-C HCLPF Component Revised %Name Description SCDF Change5 E0.55X0.143LOSS OF OFFSITE 3.45E-06 94.072POWERQUAD ROOM28 EFN204ABXZ 0.61 0.46 0.286 COOLER FANs 5.16E-05 11.340204A1B FAILUREQUAD ROOM29 EFN204CDXZ 0.61 0.46 0.286 COOLER FANs 5.21 E-05 10.481204C/D FAILURESEISMICALLY 3 ERE18781!Z 0.25 0.597 0.065 INDUCED5.24E-05 9.966CHATTER OFRELAY 187-801ASEISMICALLY CORRELATED 6 ERE132X9!Z 0.55 0.597 0.142 RELAY CHATTER 5.35E-05 8.076OF 132-509 AND609SEISMICALLY CORRELATED 7 ERE159X9!Z 0.55 0.597 0.142 RELAY CHATTER 5.35E-05 8.076OF 159-509 AND609 (1 AND 2)36 EBW209/OXZ 0.82 0.46 0.384 BLOCK WALL 209.0 5.37E-05 7.732FAILSDIESEL35 EBDDGBLDXZ 0.77 0.46 0.36 GENERATOR 5.38E-05 7.560BUILDING FAILS45 EBW45/3XXZ 1.07 0.46 0.501 5.39E-05 7.388FAILS33 EBSA8XXXXZ 0.96 0.47 0.323 A8 BUS FAILURE 5.40E-05 7.216SEISMICALLY 37 EBSB2XXXXZ 0.84 0.46 0.393 INDUCED FAILURE 5.40E-05 7.2161___ 1_ _ 1__ OF BUS B2Sheet 18 of 36

' EntergyENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Number Component Median Beta-C HCLPF Component Revised %Name Description SCDF ChangeBODG FUEL OIL43 EPM184AXXZ 1.05 0.46 0.492 PUMP P184 5.44E-05 6.529FAILURESEISMICALLY 13 ERE16059!Z 0.89 0.597 0.23 CORRELATED 5.45E-05 6.357RELAY CHATTEROF 160-509SEISMICALLY 14 ERE18159Z 0.89 0.597 0.23 INDUCED5.45E-05 6.357CHATTER OFRELAY 181-509SEISMICALLY 15 ERE18759!Z 0.89 0.597 0.23 INDUCED5.45E-05 6.357CHATTER OFRELAY 187-509SEISMICALLY 16 ERE27A5X!Z 0.89 0.597 0.23 INDUCED5.45E-05 6.357CHATTER OFRELAY 127-A5XSEISMICALY INDUCED DIESEL32 EDLGEABXXZ 1.39 0.654 0.32 GENERATOR A/B 5.45E-05 6.357CORELATED FAILUREVAC207A-D FAILS42 EFN207A-DZ 1.01 0.46 0.473 RBCCW5.45E-05 6.357PRESSUREBOUNDARYSEISMICALLY 23 ERE15169Z 1.04 0.597 0.269 INDUCED5.46E-05 6.186CHATTER OF151V-609/A,B,C SEISMICALLY 24 ERE16069!Z 1.04 0.597 0.269 CORRELATED 5.46E-05 6.186RELAY CHATTEROF 160-609SEISMICALLY 25 ERE18169!Z 1.04 0.597 0.269 INDUCED5.46E-05 6.186CHATTER OFRELAY 181-609SEISMICALLY 26 ERE18769Z 1.04 0.597 0.269 INDUCED5.46E-05 6.186CHATTER OFRELAY 187-609SEISMICALLY 27 ERE27A6X!Z 1.04 0.597 0.269 INDUCED5.46E-05 6.186CHATTER OFRELAY 127-A6XSheet 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 ChangeFAILURE OFVAC205 OR 20644 EFNDWCOOLZ 1.06 0.46 0.496 FAMILY OF FAN 5.46E-05 6.186FAMILY OF FANCOOLERSSEISMICALLY 17 ERE32801Z 1 0.597 0.258 5.47E-05 6.014CHATTER OFRELAY 132-801ASEISMICALLY 18 ERE51N81Z 1 0.597 0.258 INDUCED5.47E-05 6.014CHATTER OFRELAY 151N-801A SEISMICALLY INDUCED19 ERE51NG8!Z 1 0.597 0.258 CHATTER OF 5.47E-05 6.014RELAY 151NG-801ASEISMICALLY 20 ERE51V81!Z 1 0.597 0.258 INDUCED5.47E-05 6.014CHATTER OFRELAY 151V-801A SEISMICALLY 21 ERE59801!Z 1 0.597 0.258 INDUCED5.47E-05 6.014CHATTER OFRELAY 159-801ASEISMICALLY CORRELATED 31 ERE2352X!Z 1.2 0.597 0.31 RELAY CHATTER 5.47E-05 6.014OF 23A-K52A ANDBHPCI ROOM46 EFN201ABXZ 1.23 0.46 0.576 COOLING FANs 5.47E-05 6.014VAC201A/B FAILUREVAC202A&B FAIL47 EFN202ABXZ 1.23 0.46 0.576 RBCCW5.47E-05 6.014PRESSUREBOUNDARYCRD QUAD ROOM48 EFN203ABXZ 1.23 0.46 0.576 COOLING FANS 5.47E-05 6.014VAC 203A/BFAILUREDIESEL STARTINGAIR49 ECMK103ABZ 1.28 0.46 0.599 5.47E-05 6.014K103A/BCORRELATED I _ FAILURESheet 20 of 36

'EntergyENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Number Component Median Beta-C HCLPF Component Revised %Name Description SCDF ChangeDIESEL FUEL OIL50 EPM141ABXZ 1.28 0.46 0.599 PUMPS P-141A/B 5.47E-05 6.014FAILUREDG A & B SEIS51 EVPEABXXXZ 1.28 0.46 0.599 CORREL FUEL OIL 5.47E-05 6.014PRESSURE REGVALVE E FAILUREDG A & BSEISMICALLY 52 EVRCABXXXZ 1.28 0.46 0.599 CORRELATED 5.47E-05 6.014FUEL OIL RELIEFVALVE C FAILDIESEL AIRPSV4565C AND D53 EVS4565CDZ 1.28 0.46 0.599 SEISMIC 5.47E-05

6.0 14CORRELATION

FAILURESEISMICALLY CORRELATED 22 ERE12769!Z 1.04 0.597 0.269 CHATTER OF 5.48E-05 5.842RELAY 127-609AND 159N-609SEISMICALLY 30 ERE1425B!Z 1.14 0.597 0.295 INDUCED5.48E-05 5.842CHATTER OF 420-1846SEISMICALLY 34 ERE18681Z 1.34 0.597 0.346 INDUCED5.48E-05 5.842CHATTER OFRELAY 186-801ASEISMICALLY 38 ERE2759X!Z 1.55 0.597 0.401 INDUCED5.48E-05 5.842CHATTER OF 127-509X39 ETKT105ABZ 0.94 0.46 0.44 5.48E-05 5.842FAILURE40 EBW21O/OXZ 1.65 0.572 0.441 BLOCK WALL 210.0 5.48E-05 5.842FAILS41 EBW195/23Z 1 0.46 0.468 BLOCKWALL 5.48E-05 5.842195.23 FAILSCST 105 A/B FAILS4 ETK105ABNZ 0.16 0.46 0.075 DUE TO N2 TANK 5.77E-05 0.859INTERACTION SEISMICALLY 8 ERE40801!Z 0.67 0.597 0.173 INDUCED5.79E-05 0.515CHATTER OFRELAY 140-801ASheet 21 of 36 SEntergyENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Number Component Median Beta-C HCLPF Component Revised %Name Description SCDF ChangeSEISMICALLY 9 ERE46801Z 0.67 0.597 0.173 INDUCED5.79E-05 0.515CHATTER OFRELAY 146-801ASEISMICALLY 10 ERE1865X!Z 0.73 0.597 0.189 INDUCED5.80E-05 0.344CHATTER OFRELAY 181-5XSEISMICALLY 12 ERE15159Z 0.89 0.597 0.23 INDUCED5.80E-05 0.344CHATTER OF151V-509/A,B,C SEISMICALLY 1 EISLOCACSZ 0 0.46 0 INDUCED CORE 5.82E-05 0.000SPRAY PIPERUPTURESEISMICALLY 2 EISLOCRHRZ 0 0.46 0 INDUCED RHR 5.82E-05 0.000PIPING RUPTURESEISMICALLY CORRELATED 11 ERE12759!Z 0.89 0.597 0.23 CHATTER OF 5.82E-05 0.000RELAY 127-509AND 159N-50954 EBW198/1XZ 3.43 0.792 0.607 5.82E-05 0.000FAILSBLOCK WALL 198.255 EBW198/2XZ 3.43 0.792 0.607 FLS 5.82E-05

0.0 00FAILSSURROGATE

ELEMENT FOR56 ESURROGATZ 1 0.3 0.61 "L OH R"ALL OTHER"I___ _ _SEISMIC FAILURE I _ IThe first component in the list is LOSS OF OFFSITE POWER. The fragility for this is ageneric fragility and cannot be modified without a significant amount of work, which isbeyond the scope of this re-assessment.

The next two components, QUAD ROOMCOOLER FANs 204A/B FAILURE and QUAD ROOM COOLER FANs 204C/DFAILURE are no longer required to be in the model [9.5] (note that EFN201ABXZ andEFN203ABXZ--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 ifconservatism could be removed, which would result in a higher median capacity.

TheseSheet 22 of 36 eEntergyENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency reviews focused on conservatism in seismic demand and conservatism in seismiccapacity.

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 inseismic capacity is discussed in Sections 6.4.3 to 6.4.5. Calculations of revisedfragilities removing conservatism are contained in Attachment 10.4.6.4.2 In-Structure Response SpectraTo determine component seismic response within a structure, floor response spectraare typically generated.

The generation of the floor response for the PNPS SPRA isdescribed in Section 3.1.4.3 of the PNPS IPEEE submittal

[9.1]. For PNPS, floorresponse spectra based on design ground input spectra were generated as part of theoriginal 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 spectralshape with a 1.0E-04 exceedance probability and anchored to 0.4g peak groundacceleration 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 wereperformed 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 reviewteam assessed that the ISRS generation approach did not result in over-estimation ofin-structure floor amplification.

Thus, this was not pursued further as a source ofconservatism in the SCDF.6.4.3 Review of Capacities of RelaysMany of the components in the list, including the top three with potential for riskreduction, 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 wasprovided by PNPS in a spreadsheet.

This spreadsheet has not been located, and theGERS values used have not been independently verified by the review team. Some ofthe relays, including most of those in the Table 6.2 above, did not have GERS. Thefragilities for these relays were calculated assuming the relays would eventually beshown to meet the minimum capacity for USI A-46 [9.17]. The documentation demonstrating this has not been located.

Therefore, these fragilities have not beenISheet 23 of 36 SEntergyENGINEERING 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, thecapacities may potentially be increased since it is likely the relay capacity would exceedthe 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 variousintermediate scaling factors based on EPRI TR-103959

[9.9], two factors aredetermined which give the median capacity as a factor times the GERS 4-16 Hzspectral 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 thelocation of the cabinet in the plant. The lower of the two products is used for the finalmedian capacity.

While the methodology is correct, the actual values used in the scalefactor calculations have not been independently verified because the spreadsheet hasnot been located.Table 6.3 below shows the relay fragilities with a potential significant impact on theSCDF. It gives the basis for the median capacity.

The value of 0.6 for Beta-c is astandard value for relay fragilities.

Table 6.3Relay Fragilities Name Median Beta- Component PANEL LOC GERS GERS Am Am MAKE MODELC Description 4-16 ZPA PEAK ZPAERE18781!Z 0.25 0.60 187-801A A8 GND 1.80 0.75 0.33 0.25 GE 12CFD22B1A 132-509ERE132X9!Z 0.55 0.60 A 609 C101 DG23 WAND 609 CRN-1159-509ERE159X9!Z 0.55 0.60 AND 609 C101 DG23 GEAND 609 SVERE16059!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-1ERE27A5X!Z 0.89 0.60 127-A5X A5 TB37 GE 12HFA51A42H 151 V-ERE15169!Z 1.04 0.60 151,, A6 TB23 GE609/A,B,C 121J CV52A9AERE16069!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-1ERE27A6X!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 GE801A 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 AGASTATAND B EGP-D-002 ERE12769!Z 1.04 0.60 127-609 A6 TB23 GE 121AV51D1A Sheet 24 of 36 EntergyENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Name Median Beta- Component PANEL LOC GERS GERS Am Am MAKE MODELC Description 4-16 ZPA PEAK ZPAAND 159N-609ERE1425B!Z 1.14 0.60 420-1846ERE18681!Z 1.34 0.60 186-801A A8 GND 10.00 4.00 1.85 1.34 GE HEA61ERE2759X!Z 1.55 0.60 127-509X A5 TB37 7.50 3.00 1.73 1.55 GE 121AV53BERE40801!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 HFA54EERE15159Z 0.89 0.60 151V- A5 TB37509/A,B,C 121JCV52A9A 127-509ERE12759Z 0.89 0.60 AND 159N- A5 TB37 121AV51D(B)1A/IAV-I 1 509 1 1 51DAs stated above, the basis for the GERS values in this table, and the disposition of therelays without GERS, could not be determined in the time available for this review (withtwo exceptions which are discussed below). Further review could locate GERS ordetermine that the relays were replaced, in which cases the fragilities could beincreased.

For two of the relays, it has been possible to revise the fragility based on newinformation.

For relays 132-509 and 132-609, a GERS for the Westinghouse CRN-1relay was located [9.14]. This GERS has a 4-16 Hz spectral acceleration of 7g, whichyields a median capacity of 1.55g using the factor from Calculation C-015 [9.13]. Forrelays 159-509 and 159-609, the relays have been replaced.

The replacement relaywas seismically qualified by test. The test response spectrum had a spectralacceleration of 15g in the 4-16 Hz range, and a ZPA acceleration of 6g. Forconservatism, a 4-16 Hz spectral acceleration of 10g was assumed, which resulted in amedian capacity of 2.22g. This is higher than the surrogate median capacity.

Thecalculations are in Attachment 10.4.6.4.4 Review of Capacities of Block WallsA 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 byscaling the results of the IEB 80-11 [9.16] calculations.

The scale factor contained twoterms 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 is1/1.35. 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 medianSheet 25 of 36 SEntergyENGINEERING 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%. Thesecond term is the building amplification factor. A multiplying factor of 2.1 was used forall 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 6.2above, the building amplification factors vary from 4.47 to 9.00, which are 2.12 and4.29, respectively, times the 2.1 factor used in the fragility calculation.

Thus, themedian capacities can be multiplied by a factor of at least 2. Multiplying the C-017fragilities by 2, and also by 1.35, results in median capacities for the three block wallsabove 2g. For the purpose of this evaluation a median capacity of 2g was used. Thecalculations 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 wallswere not changed.6.4.5 Review of Capacities of Other Components Many components in the model had median capacities based on factoring theanchorage 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]. Thecapacity determined in the reference calculation was assumed to be calculated following the Conservative Deterministic Failure Margin (CDFM) HCLPF methodology inEPRI 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 notbeen assessed.

This capacity was converted to a median HCLPF by dividing by afactor 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 notbe included when using the USGS or updated EPRI Hazard Curves. The mediancapacities for these components can be in increased by 1.35. Those fragilities in Table6.2 above, other than those for relays and block walls, that had 13c = 0.46 were assumedhave 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 notedin the "Comments" column. For a component noted as "Not needed",

the median wasSheet 26 of 36

' EntergyENGINEERING 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 notedas "Brs", the revised median is 1.35 times the original median, reflecting removal of thereduction for peak-to-valley variability.

Table 6.4Revised Fragilities Revised Fragilitv Oriqinal Fraqilitv Number Name Median Beta-C Comments Median Beta-C Component Description LOSS OF5 ELOSPXXXXZ 0.35 0.55 OFFSITEPOWERNot QUAD ROOM28 EFN204ABXZ 2.00 0.46 0.61 0.46 COOLER FANs204A/B FAILURENot QUAD ROOM29 EFN204CDXZ 2.00 0.46 not 0.61 0.46 COOLER FANs204C/D FAILURESEISMICALLY INDUCED3 ERE18781!Z 0.25 0.60 0.25 0.60 CHATTE RCHATTER OFRELAY 187-801ASEISMICALLY CORRELATED 6 ERE132X9!Z 1.50 0.60 Found 0.55 0.60GERS CHATTER OF132-509 AND609SEISMICALLY Replaced CORRELATED 7 ERE159X9!Z 2.22 0.60 with 0.55 0.60 RELAYqualified CHATTER OFABB 59N 159-509 AND609 (1 AND 2)Limited to BLOCK WALL36 EBW209/OXZ 2.00 0.46 2.00 0.82 0.462.00 209.0 FAILSDIESEL35 EBDDGBLDXZ 1.04 0.46 Brs 0.77 0.46 GENERATOR BUILDING FAILSLimited to BLOCK WALL45 EBW 45/3XXZ 2.00 0.46 2.00 1.07 0.46 45.3 F A LS2.00 45.3 FAILS33 EBSA8XXXXZ Full fragility 0.96 0.47 A8 BUSanalysis FAI LURESEISMICALLY INDUCED37 EBSB2XXXXZ 1.13 0.46 Brs 0.84 0.46 ILUREOFAILURE OFBUS B2Sheet 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 OIL43 EPM184AXXZ 1.42 0.46 Brs 1.05 0.46 PUMP P184FAI LURESEISMICALLY CORRELATED 13 ERE16059Z 0.89 0.60 RELAYCHATTER OF160-509SEISMICALLY INDUCED14 ERE18159!Z 0.89 0.60 CHATTE RCHATTER OFRELAY 181-509SEISMICALLY 15 ERE18759Z 0.89 0.60 INDUCEDCHATTER OFRELAY 187-509SEISMICALLY INDUCED16 ERE27A5X!Z 0.89 0.60 CHATTE RCHATTER OFRELAY 127-A5XSEISMICALY INDUCEDDIESEL32 EDLGEABXXZ 1.39 0.65 GENERATOR A/BCORELATED FAILUREVAC207A-D FAILS RBCCW42 EFN207A-DZ 1.36 0.46 Brs 1.01 0.46 PRESSR EPRESSUREBOUNDARYSEISMICALLY INDUCED23 ERE15169!Z 1.04 0.60 CHATTE RCHATTER OF151V-609/A,B,C SEISMICALLY CORRELATED 24 ERE16069Z 1.04 0.60 RELAYCHATTER OF160-609SEISMICALLY INDUCED25 ERE18169!Z 1.04 0.60 CHATTE RCHATTER OFRELAY 181-609SEISMICALLY INDUCED26 ERE18769Z 1.04 0.60CHATTER OFRELAY 187-609Sheet 28 of 36 ASEntergyENGINEERING 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 INDUCED27 ERE27A6X!Z 1.04 0.60 CHATTE RCHATTER OFRELAY 127-A6XFAILURE OFVAC205 OR 20644 EFNDWCOOLZ 1.43 0.46 Brs 1.06 0.46 FAMILY OF FANFAMILY OF FANCOOLERSSEISMICALLY INDUCED17 ERE32801!Z 1.00 0.60 CHAUCE RCHATTER OFRELAY 132-801ASEISMICALLY INDUCED18 ERE51 N81!Z 1.00 0.60 CHATTER OFRELAY 151N-801ASEISMICALLY INDUCED19 ERE51NG8!Z 1.00 0.60 CHATTER OFRELAY 151NG-801ASEISMICALLY INDUCED20 ERE51V81!Z 1.00 0.60 CHATTER OFRELAY 151V-801ASEISMICALLY INDUCED21 ERE59801!Z 1.00 0.60 CHATTE RCHATTER OFRELAY 159-801ASEISMICALLY CORRELATED 31 ERE2352X!Z 1.20 0.60 RELAYCHATTER OF23A-K52A AND BHPCI ROOMNot COOLING FANs46 EFN201ABXZ 2.00 0.46 1.23 0.46 COIAneeded VAC201A/B FAILUREVAC202A&B Not FAIL RBCCW47 EFN202ABXZ 2.00 0.46 Ned 1.23 0.46 RES URneeded PRESSUREI I BOUNDARYSheet 29 of 36 SEntergyENGINEERING 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 QUADNot ROOM48 EFN203ABXZ 2.00 0.46 1.23 0.46 COOLING FANSVAC 203A/BFAILUREDIESELSTARTING AIR49 ECMK103ABZ 1.73 0.46 Brs 1.28 0.46 COMPRESSORS K103A/BCORRELATED FAILUREDIESEL FUEL50 EPM141ABXZ 1.73 0.46 Brs 1.28 0.46 OIL PUMPS P-141A/B FAILUREDG A & B SEISCORREL FUEL51 EVPEABXXXZ 1.73 0.46 Brs 1.28 0.46 OIL PRESSUREREG VALVE EFAILUREDG A & BSEISMICALLY 52 EVRCABXXXZ 1.73 0.46 Brs 1.28 0.46 CORRELATED FUEL OILRELIEF VALVEC FAILDIESEL AIRPSV4565C AND53 EVS4565CDZ 1.73 0.46 Brs 1.28 0.46 D SEISMICCORRELATION FAILURESEISMICALLY CORRELATED 22 ERE12769Z 1.04 0.60 CHATTER OFRELAY 127-609AND 159N-609SEISMICALLY INDUCED30 ERE1425B!Z 1.14 0.60 CHATTE RCHATTER OF420-1846SEISMICALLY INDUCED34 ERE18681Z 1.34 0.60 CHATTE RCHATTER OFRELAY 186-801ASEISMICALLY INDUCED38 ERE2759X!Z 1.55 0.60 CHATTE RCHATTER OF127-509XSheet 30 of 36 SEntergyENGINEERING 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 T105AIBFAILUREFull fragility BLOCK WALL40 EBW210/0XZ faIty 1.65 0.57 21.FALanalysis 210.0 FAILS41 EBW195/23Z 2.00 0.46 Limited to 1.00 0.46 BLOCKWALL 2.00 195.23 FAILSCST 105 A/BInteraction FAILS DUE TO4 ETK105ABNZ 2.00 0.46 fixe 0.16 0.46 N2 TANKfixed N2 TANKINTERACTION SEISMICALLY INDUCED8 ERE40801!Z 0.67 0.60CHATTER OFRELAY 140-801ASEISMICALLY INDUCED9 ERE46801Z 0.67 0.60 CHATTERCHATTER OFRELAY 146-801ASEISMICALLY 10 ERE1865X!Z 0.73 0.60 INDUCEDCHATTER OFRELAY 186-5XSEISMICALLY INDUCED12 ERE15159IZ 0.89 0.60 CHATTE RCHATTER OF151V-509/A,B,C SEISMICALLY INDUCED CORE1 EISLOCACSZ 0.00 0.46SPRAY PIPERUPTURESEISMICALLY INDUCED RHR2 EISLOCRHRZ 0.00 0.46PIPINGRUPTURESEISMICALLY CORRELATED 11 ERE12759!Z 0.89 0.60 CHATTER OFRELAY 127-509AND 159N-50954 EBWAHOQIXY Full fragility 3 0.79 BLOCK WALLanalysis 198.1 FAILSEBW1 98/2XZ Full fragility 3.43 0.79 BLOCK WALLanalysis 198.2 FAILSSheet 31 of 36 SEntergyENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency 6.5 Re-Assessment of SCDFThe PNPS SCDF was calculated in the PNPS IPEEE SPRA using the systems modelas input to the SHIP model. The model incorporated seismic fragilities for components into event trees and fault trees, producing sequences representing combinations ofsystem failures that could lead to core damage following the seismic event. For thisevaluation, 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 thefragilities in the SHIP model are expressed in terms of PGA. In order to calculate theSCDF using hazard curves for 10 Hz, 5 Hz and 1 Hz it is necessary to change thefragilities to reference the spectral acceleration at that frequency rather than the PGA. Itis not possible, at this time, to change all of the fragilities in the model. Therefore, thechange in plant SCDF was estimated using the process described below, which is thesame as the NRC used.The NRC developed a plant-fragility from the median capacity and HCLPF reported inthe PNPS IPEEE submittal.

These numbers came from the SHIP risk quantification.

However, the median capacity and composite variability in the NRC GI-199 SRA areslightly different than those that would be calculated using the SHIP numbers.

TheNRC notes that in some cases the fragility values were modified so as to match thereported SCDF. If the plant-level fragility reported by the NRC is used with EPRI 1989PGA Hazard Curve, the SCDF is computed as 5.8E-05 per year. This is what SHIPcomputes.

If the median capacity and composite variability computed directly from theSHIP 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 SHIPquantification for the same hazard curve.The SHIP model was re-run with the USGS PGA hazard and using revised fragilities asper Table 6.4, which results in a revised SCDF of 2.14E-5 per year. The mediancapacity 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 PGAHazard Curve with this fragility (C5o = 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-05per year. This agrees with the SHIP result.Using this fragility and convolving with 10 Hz, 5 Hz and 1 Hz gives the results shownbelow in Table 6.5 compared to the original NRC results.

The convolution calculations are summarized in Attachment 10.3. The detailed calculations are contained inAttachment 10.5.Sheet 32 of 36 SEntergyENGINEERING REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Table 6.52008 USGS Hazard SCDF with Revised Fragilities PGA 10 Hz 5 Hz 1 Hz MaxNRC Fragility 4.26E-05 6.88E-05 6.19E-05 2.40E-05 6.88E-05Revised Fragility 2.78E05 4.88E-05 4.36E-05 1.79E-05 4.88E-05Revised Fragility 2.14E05 3.98E-05 3.53E-05 1.49E-05 3.98E-05SHIP Adjusted INote that the SCDFs in the first row of Table 6.5 were calculated by Entergy using theNRC 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. TheEPRI Hazard Curves were prepared using different ground motion experts and use aCumulative Absolute Velocity (CAV) filter to remove high frequency waves with limitedenergy. The results are shown in Table 6.6 below.Table 6.62010 EPRI Hazard SCDF with Revised Fragilities PGA 10 Hz 1 Hz MaxNRC Fragility 3.11E-05 2.74E-05 1.87E-05 3.11E-05Revised Fragility 2.54E05 2.20E-05 1.39E-05 2.54E-05Revised Fragility 1.46E05 1.22E-05 5.57E-07 1.46E05SHIP AdjustedSheet 33 of 36 AEntergyENGINEERING 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 IPEEEstudy 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 bythe review team resulted in a SCDF estimate of 3.98E-05 per year associated with thecurrent USGS Hazard Curves, which represents a significant reduction from the GI-199reported 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 EPRIupdated Seismic Hazard Curves instead of the USGS curves further reduces the SCDFvalue to 1.46E-05 per year.8.0 RECOMMENDATIONS 8.1 Short Term Recommendations:

-Consider developing more formal calculations per EN-DC-126 to enhancethe supporting documentation associated with this Engineering Report.-Verify the assumption used in the relay fragility calculation C-015 [9.13] thatrelays without GERS were verified by PNPS to meet A-46 requirements.

8.2 Long Term Recommendations:

-Consider modeling reactor pressure vessel (RPV) depressurization functionfor seismic sequences that involve loss of high pressure RPV injection andpotential use of low pressure RPV injection (from RHR/Low Pressure CoolantInjection (LPCI) and Core Spray systems) in a future SPRA.-Consider modeling the direct torus vent system for seismic sequences thatinvolve loss of containment decay heat removal (loss of suppression poolcooling and drywell sprays) in a future SPRA.-Continue locating GERS or test data for relays in C-015 [9.13] to enableincreasing the median capacity of the fragilities.

Investigate the operational requirements of the relays.Sheet 34 of 36 A!EntergyENGINEERING 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 19919.3 NRC, "Safety/Risk Assessment Results for Generic Issue (GI) 199, Implications of Updated Probabilistic Hazard Estimates in Central and Eastern United Stateson Existing Plants,"

dated September 2, 2010 (ADAMS Accession Number ML100270582) 9.4 NRC Information Notice 2011-05:

Tohoku-Taiheiyou-Oki Earthquake Effects onJapanese Nuclear Power Plants9.5 NEA-02-044, February 13, 2002, "The Temperature Profile of the HVAC Systemsfor the Pilgrim IPE and Update for the Life Extension Project9.6 NRC Frequently Asked Questions related to the March 11, 2011 JapaneseEarthquake and Tsunami9.7 Email from Martin Stutzke (USNRC) to John Bretti (Entergy),

"Pilgrim SeismicHazard 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 theSite 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 Eastof the Rocky Mountains,"

NUREG/CR-5250, Vols. 1-8, January 1989.9.12 EPRI, "Updated Seismic Hazard Results for the Arkansas, Fitzpatrick, GrandGulf, Indian Point, Pilgrim, River Bend, Vermont Yankee, and Waterford NuclearSites." August 2010 (Not published, Proprietary).

9.13 Stevenson

& Associates, C-015: Relay Fragility Analysis for Seismic PRA (BECoSUDDS/RF 94-10).9.14 EPRI, "Seismic Ruggedness of Relays,"

NP-7147-SL, V2, Addendum 2, April1995.9.15 Stevenson

& Associates, C-017: Estimated Fragilities for Blockwalls for PilgrimStation Seismic PRA (BECo SUDDS/RF 94-10).9.16 NRC, "Masonry Wall Design,"

IE Bulletin 80-11, May 1980.Sheet 35 of 36 SEntergyENGINEERING 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 toCalculate 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 MEMBERSJoe Abisamra, PE -Chief Engineer (ECH) -Team LeadClem 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 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Attachment 1Selection Criteria for 27 Plants that Require Further Investigation 11ýEntergy ENG REPORT PN PS-RPT-I 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency NRC's August 2010 ListThis is NRC's explanation of how they compiled the list that was shared at the NRUG meetingat 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, weretrying to determine if further evaluation by the Generic Issue Program was warranted.

Becausethere 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 reportedin 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 thatthere are two sets of credible, IPEEE-era seismic hazard curves implies that there are two waysto compute the change in seismic core-damage frequency (delta-SCDF).

Specifically, you cancompute the change with respect to the LLNL curves and/or with respect to the EPRI/SOGcurves.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 oneof the delta-SCDFs was greater than or equal to 1E-5/y and the other was positive, then webinned the plant into the "continue" region. This process identified 24 plants as listed below:1. Crystal River32. Dresden 23. Dresden 34. Farley 15. Farley 26. Indian Point 27. Indian Point 38- Limerick

19. Limerick 210. North Anna 1'11. North Anna 212. Oconee 113. Oconee 214. Oconee 315. Peach Bottom 216. Peach Bottom 317. Perry 118. River Bend IPage 1 of3 ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency

19. Seabrook 120. Sequoyah 121. Sequoyah 222. Summer23 Watts Bar 124. Wolf Creek 1For plants that did not participate in the EPRI/SOG, we were limited to considering only thedelta-SCDF with respect to the LLNL seismic hazard curves. If this delta-SCDF was greaterthan or equal to 1 E-5/y, then we binned the plant into the "continue" zone. This processidentified 3 plants as listed below:1. Duane Arnold2. Saint Lucie 13. Saint Lucie 2Hence, 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

• EntergyENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Figure 14 .E-053.1-062.E-05IIS1.15-05-2.15-05-3.E-05-41-05S-5.1-OM-iE-OS O-E-OO 1.Ei- 21-05 FE-05 4.E-05 5.E-45 6E-OS 7.1-OSChange in SCDF (fE SM Baseline)

Page 3 of 3 z-Entergy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Attachment 2Develop Methodology that Emulates NRC's Use of IPEEE Parameters to Calculate SeismicCore 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 toCalculate Seismic Core Damage Frequency (SCDF) ValuesPrepared by: Dragos Nuta, PE Reviewed by: Paul BaughmanEXECUTIVE 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 riskIn developing the SCDF estimates, the NRC report (Ref. 1) indicates that the Pilgrim Nuclear PowerStation (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 thepeak 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 isto fully understand the basis for the NRC developed parameters and methodology used, after whichthe NRC SCDF calculation methodology would be used to reflect the revised fragilities andcalculate more realistic SCDF estimates.

In order to clearly understand the various parameters usedby NRC in their work, our understanding of the NRC methodology had to be verified byduplicating 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 wereestablished.

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 SCDFcalculations.

6. Use the methodology and derived parameters and perform risk analyses that duplicate theNRC Report SCDFs for PNPS.Page 1 of 19 z-EnteWgENG REPORT PNPS-RPT-11-O0001 Re-assessment of Pilgrim Seismic Core Damage Frequency A discussion of the work performed in support of all activities described above and the resultsobtained 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 theSPRA 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 reportedplant-level fragility curveApplicability 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 theseismic robustness of the PNPS Structures,

Systems, and Components (SSCs), but also the effectsof random and other non-seismic related failures.

The Mean Capacity at the plant level (in terms ofPGA) 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 standarddeviation 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 RatiosNumbe HCL C5 13c 10 5 1 BasPlant r IPEEE Method PF Hz Hz Hz IsPilgrm 1 050002 seismic PRA 0.4 0.2 .516 0.5J7l93 9 7 1.5 16 IIt 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 wereestablished.

In using plant level fragilities based on the IPEEE Review Level Earthquake (RLE), taken by NRCto be the 1989 EPRI hazard data and ground response

spectra, adjustments to the fragilities had tobe made so that they may be used in conjunction with the hazard curves, and ground spectra, basedon 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 OEnteigyENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency In a a1C6 PKI shape noed In SPRA orm10HCLPF C50HCLPFmCLF ,,.; HCLPF '- P~(Ialur)

= 0.01I I I i I nI1Hz 5 Hz 10 Hz P98Figure C-I. The Definition of Spectral Fragility in Terms of the PGA-Based Fragility andFigure C-1. The Definition of Spectral Fragility In Terms of the PGA-Based Fragility andthe Review-Level Response Spectrum.

The median seismic capacity C50 is calculated as follows:The High Confidence of a Low Probability of Failure (HCLPF) reported in Table 3-13 of Ref. 2 is0.25g:Table 3-13SPRA Results (EPRI)Result Value Value JISeismic Core Damage Frequency 5.82 E-05 3.13 E-05Plant Median Capacity (PGA(g))

0,48 0-57gPlant High Confidence of a Low Probability of 0.25g 0_32gFailure (HCLPF) (PGA(g))Plant HCLPF based on seismic faults only -random failures and human reliability excludedThe HCLPF is related to the median seismic capacity C50 to be used in the work reflecting theUSGS hazard curves as follows:C50 = HCLPF e (2.3264 x Pc)NRC assumed a Pc = 0.27 which results in C50 =0.25g x e (2.3264 x027) = 0.25g x 1.874 = 0.48g. Thismedian 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 resultsobtained when using the 1989 EPRI PGA hazard curve, and a C50 = 0.49g was used in theassessments.

[Note that when the deconvolution is done with the 1989 EPRI PGA hazard curve andthe NRC fragility, the resulting SCDF is 5.76E-05.

The value reported by the NRC in Table D.2 ofthe GI-199 SRA is 6.8E-06.

The reason for this discrepancy is not known.]Page 3 of 19 ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency The in,, M5, and mto spectral ratios were obtained from the EPRI based RLE as the ratio betweenthe 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, asshown 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 iscalculated using the Hazard Curve for a certain frequency and the fragilities for a certain SSC or, inour case, the plant level fragility (consisting of the median capacity and composite uncertainty).

Themathematical formulation shown below in the excerpt from Appendix A of Ref. 1:ai FdPcj)a)SCDF(a1,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 ourunderstanding 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 inestimating 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 usuallyprovided so data needs not be read off of the Hazard Curve. The data is arranged in order ofincreasing 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, themedian capacity of the item for which the SCDF is calculated, and the composite 13c, whichrepresents the randomness and uncertainty in the median capacity, as described below.e) Calculate the conditional probability of failuref) Convolve the interval frequency with the conditional probability of failure and obtain theprobability of failure for each interval.

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

Page 4 of 19

• EntergyENG REPORT PNPS-RPT-I 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency The steps discussed above under b) through g) were incorporated into an EXCEL spreadsheet asshown below:A B C D E F G HHazard 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 theEXCEL 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 ofknown seismic activity that could affect a particular

location, each seismic zone is associated with amagnitude M that may occur at the specific seismic zone, including its recurrence

interval, thedistance from the seismic zone to the site where the Hazard Curves must be established, as well asother parameters that deal with variability and wave propagation.

From each seismic zone, wave propagation formulations are used to propagate seismic waves ofvarious 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 theNRC report (Ref 1) shows PGA and 1 Hz Hazard Curve plots:I OI Ht0.01 '1 1 10The 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 andan 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, atabulation of accelerations and their annual exceedance probabilities is usually provided andcontains a minimum of 10-12 pairs of values. Given the summation process used to emulate anintegral, the more points considered, the more accurate the representation of the Hazard Curve incalculating the SCDF.c) For every interval, establish the interval acceleration and frequency.

Given a tabulation that has acceleration values increasing in magnitude, and corresponding annualexceedance frequencies that decrease in magnitude, the interval from one acceleration value to theone 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 intervalacceleration for the ith row is (Ai + A i+,) / 2. The result is placed in Column D of theexcerpt." 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 thedifference between the exceedance probabilities shown on row "i" and row "i + 1". Thisvalue is entered in Column E of the excerpted tabulation.

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

It is captured under Column D of theexcerpted EXCEL spreadsheet above.* Am is the median capacity of the SSC considered or, in our case, the pointestimate fragility developed for the plant. When the plant Am value established using the 1989 EPRI Hazard Curves is used in conjunction with Hazard Curvesdeveloped by USGS, the median capacity for the plant is introduced as C50 whenthe PGA Hazard curve is considered, and mi C50 when the frequency "i" HazardCurve 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 themean (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 thedistribution to the calculated z-value.

For these calculations, the conditionalprobability of failurewas 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 andprobabilities (area under the curve), remembering that the given area is always given from the meanto the absolute value of"z". Thus, probability for a negative z-value (z-value is to the left of themean) will be obtained by reading the area (probability) from the normal distribution table, andsubtracting from 0.5 (which is the area for each half of the normal distribution plot) to obtain thearea from the left tail of the distribution to the negative z-value.

The probability for a positivez-value (z-value is to the right of the mean) will be obtained by reading the area (probability) fromthe normal distribution table, and adding it to 0.5 (which is the area for each half of the normaldistribution 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 toobtain the probability of failure for each interval.

Values captured under Columns E and G of the excerpted tabulation, respectively, for eachacceleration 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 byadding 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 ofFailure.

When the PNPS point estimate fragilities are used, as discussed under d) above, thesummation represents the SCDF.As discussed below, the NRC Report (Ref. 1) provides SCDF using the 1 Hz, 5 Hz, 10 Hz, andPGA USGS Hazard Curves. The NRC reported SCDF results were duplicated using themethodology 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 wasobtained from the NRC (Refer to Attachment 10.6 of Report PNPS-RPT-l 1-0001).Page 7 of 19 "EntergyENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency USGS Hazard Curves used for the work discussed herein were obtained from the NRC and are asfollows (Note Hazard Curves are based on 2008 USGS adjusted for site soil conditions usingEPRI/SOG site amplification functions (EPRI NP-6395-D):

PGA 10 Hz 5 Hz 1 HzAnnual Annual Annual Annualexceedence 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-020.0207 4.63E-03 0.0266 7.07E-03 0.0320 8.44E-03 0.0060 7.39E-030.0288 3.12E-03 0.0392 4.70E-03 0.0473 5.30E-03 0.0092 4.48E-030.0401 2.06E-03 0.0584 3.03E-03 0.0698 3.21E-03 0.0140 2.57E-030.0560 1.34E-03 0.0870 1.88E-03 0.1037 1.88E-03 0.0211 1.40E-030.0771 8.68E-04 0.1294 1.14E-03 0.1539 1.07E-03 0.0328 7.24E-040.1065 5.55E-04 0.1922 6.69E-04 0.2272 5.92E-04 0.0495 3.58E-040.1446 3.52E-04 0.2790 3.83E-04 0.3213 3.20E-04 0.0763 1.71E-040.1957 2.23E-04 0.3955 2.15E-04 0.4608 1.69E-04 0.1163 8.09E-050.2610 1.38E-04 0.5443 1.18E-04 0.6365 8.74E-05 0.1757 3.81E-050.3410 8.57E-05 0.6864 7.37E-05 0.8229 5.26E-05 0.2743 1.79E-050.4203 5.23E-05 0.7301 6.26E-05 0.8986 4.41E-05 0.4147 8.21 E-060.5161 3.11E-05 1.0449 3.20E-05 1.2591 2.14E-05 0.5200 5.37E-060.6283 1.77E-05 1.2560 2.21 E-05 1.4560 1.44E-05 0.6428 3.55E-060.7936 9.51E-06 1.4206 1.54E-05 1.6444 9.77E-06 0.9636 1.41 E-060.9000 7.08E-06 1.7228 6.74E-06 1.9126 4.03E-06 1.1880 8.42E-071.0464 4.65E-06 2.1900 2.52E-06 2.1900 1.44E-06 1.4388 5.1OE-071.3832 1.96E-06 2.6240 7.OOE-07 2.6240 4.16E-07 2.1648 1.59E-071.8744 5.99E-07 4.0000 7.31 E-08 3.9360 6.69E-08 3.2472 4.28E-084.8708 8.57E-09As discussed under 6. below, the USGS Hazard Curves, which were plotted in Attachment 1, willbe further discretized to provide better estimates of the SCDFs that may be compared to thosepresented in the NRC Report (Ref 1).5. Derive parameters and develop mathematical formulation for all terms used in the SCDFcalculations.

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 andformulations and provide, when appropriate, quantifications for use in the SCDF analyses forcomparison against the NRC results.As mentioned above, the methodology used to calculate the SCDF was incorporated into an EXCELspreadsheet that contains, in Columns A through H, the parameters and formulations used. It isduplicated below:Page 8 of 19

!t-EnteWg ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency A B C D E F G HAnnualHazard Curve Exceedance Interval Interval Interval Z Conditional Probability Probability Acceleration Freq Acceleration (a) Frequency In(a/Am)/!c of Failure of Failurea) Hazard Curve acceleration and annual exceedance frequency

-The tabulation above contains inColumns 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, thecurves 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:

00The interval acceleration (a) -This value is calculated as discussed under 3.The Median Capacity (Am) -When performing analyses using the USGS Hazard Curves andUSGS spectra, the median capacities calculated using the 1989 EPRI ground spectra must bemodified.

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 C50 as follows:Calculated Hazard Curve Median M edFrequency Spectral Ratio Capacity Capacity(Hz) FormulaPGA I 1 x C50 0.49I Hz 0.50 0.50 x C5o 0.2455 Hz 1.66 1.66 x C5o 0.813410 Hz 1.55 1.55 x C500.7595* 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 foreach 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 theprobabilities of failure calculated for each acceleration interval.

An example of the use of these parameters and formulations for calculating the SCDF using the raw1 Hz USGS Hazard Curve presented above is presented below:Page 9 of 19 Aý- EntergyENG REPORT PNPS-RPT-1 1-00001Reassessment of Pilgrim Seismic Core Damage Frequency Am -0.49 x 0.500.2450.27f1HzPNPSNRCProbability of Failure SolutionABCDEFGHHazard 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 G120.004 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 10.0763 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-071.188 8.42E-07 1.3134 3.32E-07 6.218949123 1 3.32E-071.4388 5.10E-07 1.8018 3.51E-07 7.389937902 1 3.51E-072.1648 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-09Total Prob of Failure2.56787E-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

• EntergyENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency The upper right hand of the tabulation indicates for the 1 Hz analysis, the median capacity usedwas 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 inColumn 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 WPtstck md RoW IK Kuu. r twvy SWtyS is,. , lA-- i g Mmass: Mddp-tk, 1973). RtadMed withFor the Z value of-0.315, which is entered for the row showing the acceleration of 0. 1757g, weround 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 theZ-value, is 0.5, the area under the left half of the distribution plus the tabulated value, less 0.1179which 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 NormalDistribution 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 ColumnH 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 soilconditions.

Given the limited number of discretization points for the Hazard Curve, the valuediffers from the SCDF calculated in the NRC Report (Ref 1) which, as shown in the excerptbelow, 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 USGSIPEEE weakestDocket controlling simple weighted linkPlant Name Number PGA 10 Hz 5 Hz 1 Hz max curve average average modelPilgrim 1 05000293 I4.3E-05 I6.9E05 62-0 .05 6.912-05 10 Hz 14.9E-05 5.0E-05 6.9E-056. Use the methodology and derived parameters and perform risk analyses that duplicate theNRC 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 HazardCurves for which the acceleration interval was refined using a log-log interpolation between theraw acceleration data points for a 0.001g interval.

Excerpts from the SCDF analyses for thePGA, 10 Hz, 5 Hz, and 1Hz Hazard curves showing the 0.001g discretization and the TotalProbability of Failure for each Hazard Curve are presented in Attachment 3.A summary of the results obtained using the methodology described above, against thosereported in the NRC Report, shows full agreement:

PNPSComo~arison of Seismic CDF Results with NRC Estimates Hazard Median Seismic CDFCurve Capacity NRC Simplified Frequency (g) (Table D-1) Methodology PGA 0.49 4.3E-05 4.26E-0510Hz 0.7595 6.9E-05 6.88E-055Hz 0.8134 6.2E-05 6.19E-051Hz 0.245 2.4E-05 2.40E-05Excerpts from the EXCEL analyses using the USGS Hazard Curves for PGA, 10 Hz, 5 Hz, and 1Hz are provided in Attachment

2. Due to the rather small acceleration interval of0.001g, thenumber of rows is excessive and, as such, only a limited number of acceleration values areexcerpted.

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 wasdiscretized to 0.00 lg intervals),

the calculated SCDF for the specific Hazard Curve, and the plantlevel Median Capacity and P3c used.

References:

1. NRC, "Safety/Risk Assessment Results for Generic Issue (GI) 199, Implications ofUpdated Probabilistic Hazard Estimates in Central and Eastern United States onExisting Plants,"

dated September 2, 2010 (ADAMS Accession Number ML 100270582)

2. Pilgrim Individual Plant Examination of External Events Report, July 1994.Page 13 of 19

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

• EntergyENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency USGS Hazard Curves1.20E-031.10E-031.OOE-03,9.OOE-04 8.OOE-04, 7.00E-04CL* 6.00E-04u 5.00E-04* 4.00E-04xLU 3.OOE-042.OOE-041.OOE-04O.OOE+00-- I N ----- ---- ------ --- -Al-------------

t -I- i~n.qPGA-4-10 Hz5 HzI-- 1 Hz00.2 0.4 0.6 0.81 1Acceleration (g).21.4 1.61.82Page 15 of 19 OREntergy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency ATTACHMENT 2Excerpts from SCDF Calculations forVarious USGS Hazard Curve Frequencies Page 16 of 19 EntergyENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency PGA USGS Hazard Curve .nterval

.IITotal S.iaic Core Damae 4.26E45Plant Mdiani Caaiy IPlant ComTposite Urocertalnty, pc 62Frequency of Falr Delta RFda atSeihmnc Level (g) ExedneProbability g level0.01__6.76E_0 9.21 E 38 5. 14E-410.016 6.1E3 1.76E-36 7.34-400.017 5.79E-03 2.71 E-35 9.93E-390.018 5.42E.03 3.42E-34 1.11E-370.019 5.10E-03 3.63E-33 1.06E-360,020 4.81E-03 3.31 E-32 5.96E-360.021 4.63E-03 2-63E-31 8.71 E-350.022 4.30E-03 1i.8E 4.12E-340.023 4.07E-03 1.16E-29 2.35E-330.024 3.87E0 6.61E2 1.22E-..0.025 a69E03 3.43E-28 5.80E-320.026 3,52E-03 1.64E-27 2.54E410.027 3.36E-.03 7.22E-27 1.04E-300.2 322E-03 2.97E-26 3,06E-00.029 3.12E-03

1. 1 SE25 1.81E-290.030 2.6E0 4.16E-25 4.92E-i29 0.031 2.84E-03 1 .4~3E-24 1.7E20.032 2.73E-03 4,65E-24 4.77E-280.033 2.63E-03 1.44E-23 1,38E-270.034 2.53E-03 4.28.23 3.4E20.035 2,4E0 1.22E-22 1.02E-260.036 .6E-03 3.33E-22 2.63E-20.037 2.8E0 8.76E-22 6.52E-60.038 2.20E-03 2.23E-21 1.56E-250.39Z13E-03 5.48E21 4.08E-250.040 2.06E.03 1.31 E-20 7.34E-250.041 2.OOE403 3,030.042 1.94E-3 B. E-20 3.95E-240.043 1.SSE-03 1,50E-19 8.21 E-240.044 1.3E0 3.20E-19 1.67E-230.045 1.78E.03 6.69E-19 3.31E-23Last rows of the EXCEL spreadsheet are below:1.870 6.05E-07 1.00E+O0 1.26E-091.871 6.04E-07 1 OOE+00 122E-091.872 6.02E-07 1.00E+O0 1.26E-091.873 6.01 E"07 1.001E+00 1.75E-091.874 5.99E-07 1 OOE+00 5.99E-07Page 17 of 19

• Entergyi ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency 10 Hz USGS Hazard Curve n Total Seismc Cone Dem F uen = I 6.88E-o IPlant Median Capacit 0.7595Plant Composite Uncertainty, 1c 0.27Frequency of Faiur Delta Risk at gSeismic Level (g) Exceedance Probability level0.018 .04E-02 2.25E-43 18.40E460.019 9.78E-03 3.28E-42 1.56E-450.020 9.31E-03 4.03E-41 1.74E-440.021 8.88E-03 4.26E-.40 1.67E-430.022 8.48E-03 3.93E-39 1,41 E-420.023 8.13E-03 3.20E-38 1,05E-410.024 7.80E-03 2.33E-37 7,08E-410.025 7.49E-03 1.54E-36 4.31 E-400.026 7.21 E-03 9.23E-36 1.35E-3901027 -7T M 5.08E-35 1.94E-380.028 6.68E-03 2.59E-34 6,25E-380.029 6.44E,.3 1.23E-33 2.76E-370.030 6.22E-03 5.43E-33 1,14E-360.031 6.01E-03 2.26E-32 4.44E-360.032 5.81E-03 8.87E-32 1.63E-350.033 5.63E-03 3.30E-31 5,71 E-350,034 5.45E.03 1.17E-30 1.90E-340.035 5.29E-03 3.93E-30 6.05E-340.036 5.14E-03 127E-29 1,84E-330.037 4.99E-03 3.92E-29 5.39E-330.038 4.85E-03 1.1 7E-28 1.83E-320.039 4.70E-03 3.34E-28 3.41E-320.040 4.59E-03 9.25E-28 1.14E-310.041 4.47E-03 2.48E-27 2.89E-310.042 4.36E-03 6.43E-27 7.15E-310.043 4.24E-03 1 62E-26 1.71E-300.044 4.14E-03 3.97E-26 4.OOE-300.045 4.04E-03 9.46E-26 9.12E-300.046 3.94E-03 2,20E-25 2.02E-290.047 3,85E-03 4.99E-25 4.40E-290.048 3.76E-03 1.11 E-24 9.33E-29Last rows of the EXCEL spreadsheet are shown below3.996 1 7.35E-08 I 1.OOE+00 I 9.85E-1 1 13.997 7.34E-08 I 1.OOE+00 9.83E-1 13.998 7.33E-08 1.00E+00 9.82E-1 13.999 7.32E-08 1.00E+00 9.80E-1 14.000 7.31 E-08 1 .OOE+00 7,31E-08Page 18 of 19

• EntergENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency S lb USGS Hazard Curve 4*1iIntervala

• s Sm ucs a F = 1 6.19P flanMdanCpaciy U1 0834Pat HLF aP~n omoieUncditO 0-2710.021 13E0 1.4241 5.12E-450.02 121 E-02 1 .16E-39 6.45E-430,024 1.1 6E-02 8,77E-39 4.48E-420.025 1.11E-02 6,OOE-38 2.82E-410.02 1.06E-02 3.73E-37 1.62E-400.027 1.02E-02 2.13E-36 8,53E-400.028 9.77E03 1.12E-35 4.16E-390.029 I 9.4E03 5.48E-35 1.89E-380., .DE0 2.50E-34 80E30.3 8.73E-03 1.07E-33 3.1 7E-370,032 8. -03 4134E-360.3 , E0 1.66E-32 4.70E-360.034 7,85E03 6.03E-32 1.60E-350.035 7.58E-0 2.09E41 5.1E30.036 7, -03 6IE-31 1.62E-340.037 7.10E-3 2.1 9E-30 0.038 6.87E-03 68 -30 1.40E330.039____

6.67E-03 1.96E-29 3.70E-330.040 6.7E-03 5256E-2.9 1.04E0.04 1 56,2E-03 1.5,2E-28

.00 5.94E-03 1.0 1 2-30.04 5.48E,07 3 1.7,5-25 2.2E-0.050 494&03 3.77E-25 4.67E-290.051 4.81 8.3 I7.99E-25 9.47E-29Last rows of the EXCEL spreadsheet are shown below:1 3.932 1 6.72E-08 11.00E+00 I 7.70E-1 13.933 8.71E-08 1.00E+00 7.69E-113.934 6.70E-08 1.00E+00 7.68E-111 3.935 1 6.69E-08 I 1.008+00 I 7.67E-1 1 I3.936 1 6.69E-08,

1. IE+00 I 6.69E-08 IPage 19 of 19

,_Entergy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Attachment 3Revised SCDF for PNPS Using USGS & EPRI Hazard Curves c-EntergENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Prepared by: Paul Baughman, PEReviewed by: Dan Nuta, PEJohn BrettiAssessment of the Effect of Identified Conservatisms on theSCDF Estimates Obtained Using the USGS Hazard Curves.Seismic core damage frequency analyses using the 2008 USGS Seismic Hazard Curves used by NRC for1 Hz, 5 Hz, 10 Hz, and PGA, discretized to acceleration intervals of 0.001g by log-log interpolation, wereperformed using fragilities adjusted for identified conservatisms.

The analyses consist of convolving theUSGS 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 changesin 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 SCDFusing the PGA hazard curve matches the SHIP-calculated SCDF.Results from the analyses are presented below.Analysis Series -1 2 3Hazard Curve NRC Reported Entergy SCDFs Entergy SCDFs Entergy SCDFsFrequency SCDF Am = .49g Am =.57g Am = .63gEstimates P3c = .27 Pc = .23 3c = .23PGA 4.3E-05 4.26E-05 2.78E-05 2.14E-0510 Hz 6.9E-04 6.88E-04 4.88E-05 3.98E-055 Hz 6.2E-05 6.19E-05 4.36E-05 3.53E-05I Hz 2.4E-05 2.40E-05 1.79E-05 1.49E-06Page 1 of2

".Entergy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Assessment of the Effect of Identified Conservatisms on theSCDF Estimates Obtained Using the EPRI Updated Hazard Curves.Seismic core damage frequency analyses using updated hazard curves developed by EPRI for 1 Hz, 10Hz, 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 EPRIupdated 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 changesin 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 SCDFusing the PGA hazard curve matches the SHIP-calculated SCDF.Results from the analyses are presented below.Analysis Series 1 ! 2 3NRC Reported Entergy SCDFs Entergy SCDFs Entergy SCDFsHazard Curve SCDF Am =.49 Am = .57 Am = .82gFrequency USGS-Based

= .27 PC.23 PC = .23Estimates PGA 4.3E-05 3.11E-05 2.54E-05 1.46E-0510 Hz 6.9E-04 2.74E-05 2.20E-05 1.22E-055 Hz 6.2E-05 n/a n/a n/a1 Hz 2.4E-05 1.87E-06 1.29E-06 5.57E-07Page 2 of 2

'%-EntergY ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Attachment 4Revised 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 NutaThis attachment shows the calculations done in revising the fragilities of identified low capacitycomponents.

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 eachcomponent 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 theplant.For each component in the list, the basis for fragility is examined, to the extent possible in alimited amount of time, for excess conservatism in the median capacity.

The median capacitywill 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 refersto the median capacity of the component in terms of peak ground acceleration.

Beta-c refers tothe composite variability.

HCLPF refers to the high confidence of low probability of failurecapacity.

Page 1 of 14 t-Entergy ENG REPORT PNPS-RPT-11-00001 Revised Calculations for Identified Low Capacity Components Numbern NameELOSP)000Z-2 Ef N2O4A BXZ29 EFN204CD)Z 3 JERE18781!Z 6 JERE132X9'7Z 7 IERE159X9!Z Median0.350.610.610.250.55Beta-C.0.550.460.460.5970.597HCLPF0.1410.2860.2860.0650.142Component Description LOSS OF OFFSITE POWER- ---- -QUAD ROOM COOLER FANs 204A/B FAILUREQUAD ROOM COOLER FANs 204C/D FAILURESEISMICALLY INDUCED CHATTER OF RELAY 187-801ASEISMICALLY CORRELATED RELAY CHATTER OF 132-509 AND 6090.550.5970.142 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 FAILS35 EBDDGBLD)X

_0.77 L_0.46 J 0.36 DIESEL GENERATOR BUILDING FAILS45 _EBW45/3)0

.___1.07 1-0.46 -_0.501 BLOCK WALL 45,.3 FAILS33 -EBSA8)0 ...Z 0.96 1 0.47 0.323 1A8 BUS FAILUREj 37 IEBSB2)000Z 0.84 0.46 0.393 SEISMICALLY INDUCED FAILURE OF BUS B243-- IEPM184A)0 1.05_ _0.46 0.492 IBODG FUEL OIL PUMPP184 FAILURE13 !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 181-50915 ERE18759IZ 0.89 0.597 0.23 ISEISMICALLY INDUCED CHATTER OF RELAY 187-50916 IERE27A5XIZ___

0.89 0.597 0.23 SEISMICALLY INDUCED CHATTER OF RELAY 127-A5X32 EDLGEAB)X__

1.39 0.654 -0.32 SEISMICALY INDUCED DIESEL GENERATOR A/B CORELATED FAILURE42 -EFN207A-DZ 1.01 0.46 0.473 VAC207A-FAILS RBCCW PRESSURE BOUNDARY23 --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 160-60925 iERE18169!Z 1.04 0.59_7 0._.269 SEISMICALLY INDUCED CHATTER OF RELAY 181-60926 ERE18769!Z 1.04 0.597 0.269 SEISMICALLY INDUCED CHATTER OF RELAY 187-6092- -ERE27A6XZ 1.0 0.57 0269 SESIAL NDCDCATRO-F-RELAY 127-AS44 EFNDWCOOLZ 1.06 0.46 0.496 FAILURE OF VAC205 OR 206 FAMILY OF FAN COOLERSERE328017AI

_]1.04 0._597 0 -I0269SEISMICALLY INDUCED CHATTER OF RELAY 132-8A617 ERE51N81!Z 1 .50.597 SEISMICALLY 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 B46 JEFN201AB)(

1.23 0.46 0.576 HPCI ROOM COOLING FANs VAC201A/B FAILURE47 EFN202AB)Z 1.23 0.46. 0.576 VAC202A&B FAIL RBCCW PRESSURE BOUNDARY48 1EFN203AB)Z 1.23 0.46 0.576 CRD QUAD ROOM COOLING FANS VAC 203A/B FAILURE49 ECMK103ABZ 1.28 0.46 0.599 DIESEL STARTING AIR COMPRESSORS K103AIB CORRELATED FAILURE50 EPM141ABXZ 1.28 0.46 0.599 DIESEL FUEL OIL PUMPS P-141A/B FAILURE51 -EVPEAB)00(

1.28 0.46 0.599 DG A & B SEIS CORREL FUEL OIL PRESSURE REG VALVE E FAILURE52 IEVRCAB)00__

1.28 0.46 0.599 DG A & B SEISMICALLY CORRELATED FUEL OIL RELIEF VALVE C FAIL53 1EVS4565CDZ_

1.28 0.46 0.599 DIESEL AIR PSV4565C AND D SEISMIC CORRELATION FAILURE22 ERE127691Z 1.04 0.5971 0.269 SEISMICALLY CORRELATED CHATTER OF RELAY 127-609 AND 159N-60930 ERE1425B!Z 1.14 0.597 1 0.295 SEISMICALLY INDUCED CHATTER OF 420-184634 ERE18681!Z 1.34 0.597 0.346 SEISMICALLY INDUCED CHATTER OF RELAY 186-801A38 ERE2759)]Z 1.55 0.597 0.401 SEISMICALLY INDUCED CHATTER OF 127-509X39 ETKT105ABZ 0.94 0.46 0.44 CSTs T105A/B FAILURE40 IEBW210/0)Z 1.65 0.572 0.441 BLOCK WALL 210.0 FAILSK 41 1 0.46 0.468 BLOCKWALL 195.23 FAILS4 !ETK105ABNZ 0.16 0.46 0.075 CST 105 A/B FAILS DUE TO N2 TANK INTERACTION 8 ERE40801!Z 0.67 0.597 0.173 SEISMICALLY INDUCED CHATTER OF RELAY 140-801A9 ERE468018 Z 0.67 0.597 0.173 SEISMICALLY INDUCED CHATTER OF RELAY 146-801A10 ERE1865)QZ 0.73 0.597 0.189 SEISMICALLY INDUCED CHATTER OF RELAY 181-5X12 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 RUPTURE2 EISLOCRHRZ 0 0.46 0 SEISMICALLY INDUCED RHR PIPING RUPTURE11 ERE12759!Z 0.89 0.597 0.23 SEISMICALLY CORRELATED CHATTER OF RELAY 127-509 AND 159N-5095455EBW198/1XZ EBW1 98/2)XZ3.433.430.7920.7920.607 BLOCK WALL 198.1 FAILS0.607 BLOCK WALL 198.2 FAILSPage 2 of 14 N Entergy ENG REPORT PNPS-RPT-1 1-00001Revised Calculations for Identified Low Capacity Components Identification of Conservatism There are four groups of components in the table above whose median capacities can bemodified:

1. Component failures that can be eliminated from the model2. Relay chatter failures3. Block wall failures4. Other component failuresComponent Failures that can be Eliminated from the ModelThe first component in the table above, LOSS OF OFFSITE POWER, cannot be changedwithout further research.

The next two components, QUAD ROOM COOLER FANs 204A/BFAILURE and QUAD ROOM COOLER FANs 204C/D FAILURE are no longer required to bein the model due to systems consideration.

EFN201ABXZ and EFN203ABXZ-CRD, quadcoolers and HPCI room coolers, are also not required.

EKTI05ABNZ, CST 105 A/B fails due toN2 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 FailuresTwo relay fragilities were revised, ERE132X9!Z and ERE159X9!Z.

The relay fragility calculations are documented in C-015 (Stevenson

& Associates, C-015: Relay Fragility Analysisfor 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 (fromC-0 15). 132-609 is the same.Relay 9 Basic Event Panel Loc, r.1i9f Model G GERS Values 1g) Medianr Median LesserPeak above 33 Frag1lty Fragilty Fragility I (Peak) Iq .!IDCFTI(A)

EREDCFTAZ CIDI OG23 Agestat 2412PO 12.5 5 1 2-75 1 2 7c : .76s132-S09 ERE13259!Z C101 DG23 west CAN.1 UsCA-45 UseA-46 055 1 C'55 055demand demandPage 3 of 14

ýý-Entergy ENG REPORT PNPS-RPT-1 1-00001Revised 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, andsupplements);

rather, it was based on just meeting the A-46 (NRC, "Verification of SeismicAdequacy of Mechanical and Electrical Equipment in Operating

Reactors, Unresolved SafetyIssue (USI) A-46," Generic Letter 87-03, February 1987) capacity requirement.

A GERS nowexists for the Westinghouse CRN-I relay. It is in Group 18 of EPRI NP-7147-SL, "SeismicRuggedness 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 contactswill 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 GERSfragility level is given for each contact state. The ZPA acceleration is 60% of the 4-16 Hzacceleration per EPRI NP-7147-SL.

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

Zagidty('

LWevhTusI Group 16. Md"l42) _ __KO I M NO meE_12lAM __ _ 10 , L, 2 NA6M.~ -..... 7 ' 7 NAl~fl~O$ ..L..J 10 NIAAV.0 i24A1 10, --0oGE J 1R¶!0 10 to 10e. 10 IQ 10o 10(3e ]12HGlA10 6 MR j ý! A 10l_ 1&HFA1,lAtMV it NA _NA, NAOFeye" 5;C'z' 1,,, NA4471 N "AWk 4 NA ACH 10-0 10 10 *w I CY. .2,. iL eW V4 a. 46 , 9, NAA!EMOC 166 J.J.1 ID 10Teao e up Ie ._ _21, 1GE 121AVSK ____ 7 2 10W j GD-1 7 L I4 .$ NA800 050 -- I0 1 10 1 10AS= ýO NA 1+ MACS 10 to0AB __ __" _ __ 10+/- 10l 0 1*The entry for these relays from the A-46 Essential columns give the operational state.Relay List is shown below. The far right10 1 32-Wg r-491 ES OL2 DO0A 27r T wadf'eP.

CRNddNO AN ASOS NO 640lit i32.tSS C102 Es 0L2 Dr. 27 T W000timo Cf64-iNO NoThe list above shows the relay state is normally open (NO) and de-energized (No in far rightcolumn).

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 1-00001Revised Calculations for Identified Low Capacity Components The GERS accelerations are converted to median capacities for Pilgrim using scale factors.

Thetable of scale factor from C-015 is shown below.MCCCanital swicligear sPRA 0.a -TvOe BSwthbolcd TvoeLoc.iorn EW EW NS "S Peak ZPA Peak ZPA Peak ZPAPeak ZPA Peak ZPA --D623 0.783 0.320 0.802 0.305 0.2-12 0.57 0.222 0557 0.167 0418GND23 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 0689RW23 0.17 0.214 0.489 0207 0.442 1,060 0.375 0906 028l 0679RW37 050 0-216 0.497 0.259 0.431 0,682 0,366 10.746 0 27 0 51T823 0.536 0.268 0483 0.267 0,425 08521 0360 0 7.'3 0 V70 05.2TO37 0.6n- 0276 0611 0281 0.363 1.0613 0309 0 690 0 -31 0617The panel C I01 is a control benchboard at location DG23. Therefore, the median capacity, perthe table above, is the lesser of 0.222 times the 4-16 Hz spectral acceleration or 0.557 times theZPA acceleration.

Considering the GERS for the Westinghouse CRN-1 these calculations are:0.222 x 7.Og = 1.55g0.557 x 4.2g = 2.34gTherefore, 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 LesserPeak above 33 Fragiliy Fragility I Fag~ility

-_____________

_____ .jPeakb *g 3 fZPAI ,l{ jg1DCFTI(A)

EREDCFTA!Z C101 D 023 Agaslal 2412Po 12.5 I 2.78 27A=- J7S132.509 ERE13FA9IZ ClO OG23 West CRN-t Use A-49 Use A461 055 C 555 _ _05,1_demand demand159-509 1 ,2 ERE159592 C101 OG23 GE SV Use A.46 Use A-46 055 0 05 o51 demand demandDCFTI(B)

EREOC.FTB!

C102 OG-3 AWt1 2412PD 12.5 5 271 :7[ý 271132-609 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 C SS 055.... I. I.. ...I -- demand I demand IAs reported by PNPS personnel, ERE159X9!Z has been changed to a ABB 59N relay. Thisrelay has been qualified by ABB Report RC 5139-B (BECo SUDDS/RF 96-16).Page 5 of 14 S ENG REPORT PNPS-RPT-1 1-00001ýz-Entergy Revised Calculations for Identified Low Capacity Components The cover of the seismic qualification report is shown below.SEISMIC ftenter: ASEA BROWN BOVERI !ar .fbate: ID/fl/SITik: 27ig Im~l. A Dt, 019ePrep. by: a. ConradTest Model : Cat. i Z1IT175Test Procedure

-Per AM Specification RC-20tl-S to =et thereqoitanents 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 eecondsduration, 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 testedand 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 uithiothe 6g ZPA limitation of the actuator.

Notes The biaxial naton predates an acceleration with equalvertical end horizonte.al

ompsnca, rhue yielding atotal ZPA of 8.g at 45 .The TS shove the verticalcoeponent.

as analyzed at oane third octave intervals between I and 100 Alt. The *AUlydis is shown fordamping flators of 5, 3, 2, and It.Generic Other relays qualified by this teat eeriestAll ala typt relays, saries eiSTAll ABl type 5I relays, aeriea I1LUTest case models are also qualified by this report in.colanjscIn with supplementary "eeto (Aenon 2461639"

,5/25/80E, uioi test levels equal to or grester thanthe TRS shown on page 3 of this report:Al& Alt type 271t relays, series 411TAll .ABB type 9IN relays, series "1iUThis is sywevrty of ASiE gotisi and prspietary an eonfiderntial infltle.514h reit nf% M Cup'itat or disclosed ether thap as esxeessly authorized tby ASiE FI Bul.OMEPage 6 of 14

• EntergyENG REPORT PNPS-RPT-I 1-00001Revised 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 mediancapacity.

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 notclear 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 goodmedian capacity.

Page 7 of 14 1"Entergy ENG REPORT PNPS-RPT-1 1-00001Revised 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 arecontrol benchboards located at DG23. The median capacity is lesser of 0.222 times the 4-16 Hzacceleration of 10g, or 0.557 times the ZPA.0.222 x lOg = 2.22g0.557 x 4g = 2.23gTherefore, the median capacity is 2.22g.Block Wall FailuresThe 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 ResultsInitial SeismicBuilding Elevation Wall No. Estimation Fragility Am(SSE)1 JAm)Intake 21".4 45.01 0.67 g 0.67 gStructure 21'-6" 45.02 0.66 g 2.39 g21'-6" 45.03 0.66 Q 1.07 g511-0" 64.05 0.65 g 0.72 gReactor 511-01 65.06 0.65 g 3.82 gBuilding 74'-3" 66.22 0.49 g 2.92 g74'-3 66.24 0.499 2.92 gReactor Aux. Bay 3T-0 185.01!1 0.86 g 1.41 gRadwaste 23'-0" 194.22 0.49 g 3.33 gBuilding 37'-0" 195.23 0.42 g 1.09-_23'-0" 198,00 0.32 g 2.299Diesel 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 g23'.0. 209.00 0.49 g 0.82 g23'-0*' 209.01 0.49 g 1.72 gTurbine 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 g37'-0" 210.03 0.42 g 0.549 g*NOTE: Fragility analysis for blockwalls 198.01, 198.02, 210.00 and 210.01superseded by detailed fragility analysis in calculation 91C2672-C012 Page 8 of 14 a ENG REPORT PNPS-RPT-11-00001 ct-Entergy 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 labeled45.3, 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-46anchorage calculation.

The following is from C-017:To convert a HCLPFM, value to a median capacity two variables It = 0.40 and is, = 0.20are 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, = (HCLPF5,- -- x Amplification Factor EQ 1etl= 0.15g x2.1 x 2.1 = 0.66 gS&A performed Soil Structure Interaction for the Pilgrim Station using a reference peakground acceleration of 0.4g (Ref. 1). The resulting floor spectra from this analysisestablish the relationship between spectral accelerations on building floors, and a 0,4gPGA seismic input using the SPRA spectral shape. On the basis of this analysis, themedian fragilities of blockwalls (i-e. the A, values) can be calculated by ratioing thespectral ordinate S,,spR) of the appropriate response spectrum anchored to SPRA PGA.=0.4 g to the median capacity A, = 0.66 g:= Ac xO.4g E02A,,(SSE)

S#.smpR--

The 2.1 Amplification Factor is explained below:For conservative estimation of the HLCPFe values for the blockwalls the factor of 2.1 isemployed.

This factor represents approximation of the ratio of spectral peakacceleration 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 FactorDiesel Generator El 23'-0 ...........

399..........

2.60Intake Structure El 21'.6" .........

1.23g ..........

8.20Reactor Building El 51'-0" ..................

1,48g .................

9.87Reactor Building El -0" ............

g...........

4,07Radwaste El 2-0" .. ............

1.359..........

9,00Radwaste El 37'-0"- .. ...................

0.679 .. ..............

4.47Turbine Building El 2"-0". ...................

1.359 ..........

9.00Turbine Building El 37-0" ....... .......1.8g .. .............

12.60Page 9 of 14 S Entergy ENG REPORT PNPS-RPT-1 1-00001Revised 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 atRadwaste Building El. 37'-0". The amplification factor is 4.47. Wall 209.00 is at TurbineBuilding El. 23'-0". The amplification factor is 9.00. These amplification factors could havebeen 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 actualcapacity/demand ratio in the 80-11 calculation.

These calculations are shown in C-017. Noexcess 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 factoris 1/1.35. The USGS and updated EPRI Hazard Curves include this variability; therefore, itshould not be included in the fragility calculation.

This means that the median capacities can beincreased by 35%. The second source is the building amplification factor. A multiplying factorof 2.1 was used for all of the walls in C-017, yet table of building amplification factors on Page 5of 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 and4.29, respectively, times the 2.1 factor used in the fragility calculation.

Thus, the mediancapacities can be multiplied by a factor of at least 2. Multiplying the C-017 fragilities by 2, andalso by 1.35, results in median capacities for the three block walls above 2g. For the purpose ofthis evaluation a median capacity of 2g is used.Other Component FailuresThere 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 than0.46 were obtained by full fragility analysis.

These are not examined for conservatism.

Notethat 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

'EntergENG REPORT PNPS-RPT-1 1-00001Revised Calculations for Identified Low Capacity Components Name Me4dian Beta -CEBDDGBLD)(Z 0.77 0.46EBSB2)000(Z 0.84 0.46HCLP F __Component Descriptlon 0.36 DIESEL GENERATOR BUILDING FAILS0.393 SEISMICALLY INDUCED FAILURE OF BUS B2I fI iý 4342492EPM184A)0(

EFN207A-DZ EFNDWCOOLZ ECMK103ABZ 1.051.011.061.280.460.460.460.460.4920.4730.4960.599BODG FUEL OIL PUMP P184 FAILUREVAC207A-D FAILS RBCCW PRESSURE BOUNDARY50511 52ý39EPM141ABX(Z

_EV-PE-AB)00-Z

-,EVRCAB)00(Z

_EVS4565CDZ 1.281.281.281.280.460.460.460.460.5990.5990.5990.599FAILURE OF VAC205 OR 206 FAMILY OF FAN COOLERSDIESEL STARTING AIR COMPRESSORS K103A/B CORRELATED FAILUREDIESEL FUEL OIL PUMPS P-141AIB FAILUREDG A & B SEIS CORREL FUEL OIL PRESSURE REG VALVE E FAILUREDG A & B SEISMICALLY CORRELATED FUEL OIL RELIEF VALVE C FAILDIESEL AIR PSV4565C AND D SEISMIC CORRELATION FAILURECSTs T105A/B FAILUREETKT105ABZ 0.940.46 j 0.44The following excerpt from section 3.1.4.2 of the PNPS IPEEE submittal describes the processof factoring up a HLPLF to get the median capacity.

The process used a factor of 1.35 toaccount for peak-to-valley variability.

This can be removed if the seismic hazard analysisaccounts 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 1-00001Revised Calculations for Identified Low Capacity Components Using these conservative seismic capacities in median fragility analysis requires a two step processusing 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 spectralshape that represents an 84% non-exceedance level, whereas seismic fragility analysis uses amedian or 50% non-exceedance level. The first conversion adjusts an SMA HCLPF (aHCLPF84) to median equivalent (a HCLPF50) as:HCLPFeA HCLPF84HCLPFso=

e -- 1.35where:O3rs = Response spectrum logarithmic standard deviation (taken at 0.3 for East Coast sites).The resulting value of the HCLPF50 corresponds to the 5% probability of failure on the 95%confidence interval.

The second conversion moves from the HCLPFso to the median capacitypoint, or the 50% probability of failure on the 50% confidence interval as:HCLPFSo HCLPFsoC,= eZ.3 -0.35Where.Cm = Median in-structure seismic capacity03c = Combined uncertainty

= 0.46 for this project.Combining these two steps into a single equation results in the direct relationship betweenHCLPF84 and median capacity as:C. = HCLPFs4 2-1 x HCLPFuSeismic capacities (Am) are expressed in terms of a Peak Ground Acceleration normalizing the in-structure seismic capacity as:A,,,=-CR x 0.4gWhere: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 IRSAll of the median capacities for the components in the table above can be increased by a factor of1.35. This is done in the table below.Page 12 of 14 tt-Entergy ENG REPORT PNPS-RPT-1 1-00001Revised Calculations for Identified Low Capacity Components Number Name35 EBDDGBLDXZ 37 EBSB2)0O00Z 43 EPM184A)O(

42 EFN207A-DZ 4 EFNDWCOOLZ 49 'ECMK103ABZ 50 EPM141ABXZ 51 52 iEVRCAB)OO0Z 53 IEVS4565CDZ

_39 ETKT105ABZ Origlni aQeaaMiedlanT.Factor 0.77 1 1.350.8 1.351.05 1.351.01 1.351.06 -1.351.28 -1.351.28 1.351.28 1.351.28 1.35-_1.28 1.35RkevlSaeMedian __ Component Description 1.04 DIESIEL GENERATOR BUILDING FAILS1 SEISMICALLY INDUCED FAILURE OF BUS B21.42 BODG FUEL OIL PUMP P184 FAILURE1.36 VAC207A-D FAILS RBCCW PRESSURE BOUNDARY1.43 --FAILURE OF VAC205 OR 206 FAMILY OF FAN COOLERS1.73 DIESEL STARTING AIR COMPRESSORS K103AJB CORRELATED FAILURE1.73 DIESEL FUEL OIL PUMPS P-141A/B FAILURE1.73 DG A & B SElS CORREL FUELOIL PRESSURE REG VALVE E FAILURE1.73 DG A & B SEISMICALLY CORRELATED FUEL OIL RELIEF VALVE C FAIL1.73 DIESEL AIR PSV4565C AND D SEISMIC CORRELATION FAILURE1.27_jCSTs T105A/B FAILURE+10.94 1 1.35Page 13 of 14 A% Ente v ENG REPORT PNPS-RPT-1 1-00001Revised Calculations for Identified Low Capacity Components Summary of ResultsThe 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 FAILURE29 JEFN204CD)(Z

___2.00 0. 46 Nol needed __OIUAD ROOM COOLER FANs_204C/D FAILU-R-E

___3 EJRE1 8781'Z .0.25 .0.60 ]SEISMICALLY INDUCED CHATTER OF RELAY 187-801AS6 ERE132X9.Z

.1.580- 0.60 Found GERS ISEISMICALLY CORRELATED RELAY CHATTER OF 132-509 AND 609 _9-T_7 ERElI59XZ-2.22 I 0.60 t 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 FAILS45FEBW45/3)CZ 2.00 I 0.46 Limited to 2.00 BLOCK WALL 45.3 FAILS33 IEBSA8)000 ul rglt(aayiA8BSFIUE

_ _37 EBSB2C000

_1.13 j0.46 __Brs IJSEISMICALLY INDUCED FAILURE OF BUS B2/EPM184A)0(Z

___1.42 0.46 I ..Brs _IBODG FUEL OIL PUMP P184 FAILURE13 ERE16059'.

I _______ SEISMICALLY CORRELATED RELAY CHATTER OF 160-50914 ERE18159Z

__ _ 1SEISMICALLY INDUCED CHATTER OF RELAY_181-509 15 -ERE 187592--

I, -----JSEISMICALLY INDUCED CHATTER OF RELAY 187-509-16 " JERE27A5XAZ JSEISMIICALLY INDUCIED-CHATTER OF RELAY 127-A5X_.

.. .--BX .SEISMICALY INDUCED DIESEL GENERATOR A/B CORELATED FAILURE42 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 181-60926- ERE18769'_-

.SEISMICALLY INDUCE-DCH-ATE-R OF RELAY-187-609

.. .-27 -ERE27A6X!-

..SEISMICALLY INDUCED CHATTER OF RELAY 127-A6X44 EFNDWCOOLZ 1.43 0.46 Brs FAILURE OF VAC205 OR 206 FAMILY OF FAN COOLERS17 'ERE32801 _ _ SEISMICALLY INDUCED CHATTER OF RELAY 132-801A18 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 159-8OlA31 ERE2352XIZ I ___ .!SEISMICALLY CORRELATED RELAY CHATTER OF 23A-K52A AND B46 EFN201AB)C 1 2.00 0.46 Not needed d HPCI ROOM COOLING FANs VAC201A/B FAILURE47 EFN202AB)C 2!.00 0.46 Not needed IVACM,-AB FAIL RBCCW PRESSURE BOUNDARYV4i8 EFN203AB)Z 2.00! 0.46 Not needed CRD QUUAD ROO-M COO LING FANS VAC-203NAB-FA L URfE49 ..EC.MK1ABZ 17-3 046 Bra DIESEL STARTING AIR COMPRESSORS K103A/B CORRELATED FAILURE50 EPM141ABXZ 1.73 0.46 Bra DIESEL FUEL OIL PUMPS P-141A/B FAILURE51 EVPEAB)0Z 1.73 j 0.46 Brs DG A & B SEIS CORREL FUEL OIL PRESSURE REG VALVE E FAILURE52 EVRCAB)0DG 1.73 I 0.46 Bra DGA & B SEISMICALLY CORRELATED FUEL OIL RELIEF VALVE C FAIL53 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-60930 -ERE114B'Z-

-.-.. .." .. SEISMICALLY INDUCED CHATTER OF 420-1846341ERE-1_____

81V SEISMICALLY INDUCED CHATTER OF RELAY 186-801A3 RE X SEISMICALLY INDUCED CHATTER OF 127-509X39 {ETKT105ABZ 11.27 -0.46 1 Brs CSTs T105A/B FAILURE40" EBW210/0XZ

_ ___.. Full fragility analysis BLOCK WALL 210.0 FAILS41 EBW195/23Z 2.00 1 0.46 1. Limited to 2.00 BLOCKWALL 195.23 FAILS4 [_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 140-801A9 ERE468011 2 ._ _ SEISMICALLY INDUCED CHATTER OF RELAY 146-801A10 __ERE1865!

_ ___ .SEISMICALLY INDUCED CHATTER OF RELAY 186-5X12_ ERE1 5159!Z -SSM CLLY INDUCEDW CATR OF 151 V0/A.B.C1 EISLOCACSZ I _____-_.__

SEISMICALLY INDUCED CORE SPRAY PIPE RUPTURE2 EISLOCRHRZ

___ SEISMICALLY INDUCED RHR PIPING RUPTURE11 ERE1-2759!-

I---__ SEISMICALLY CORRELATED CHATTER OF RELAY 127-509 AND 159N-50954 EBW198/1X-

--. Full fragility analysis BLOCK WALL 198.1 FAILS55 --EB-iB/q982X 2___ Full~~ fragility analsis lBLOCK WALL 196.2 FAILSPage 14 of 14

~EntergyENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Attachment 5SCDF Calculations Using Plant-Level Fragility Is Entey ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Prepared by: Paul Baughman Reviewed by: Dragos NutaBackground 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 modelincorporated seismic fragilities for components into event trees and fault trees. These resulted insequences where system-induced failures could lead to core damage. The fragilities in the modelare in terms of peak ground acceleration (PGA). Therefore, the seismic hazard curve used mustalso 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 methodused for computing the SCDF for each curve is develop a plant-level fragility P(a) and convolveit with the hazard curve H(a), where a is acceleration.

The plant-level fragility for PGA isdeveloped from the IPEEE SCDF, median capacity and HCLPF. For use with other hazardcurves, the median capacity is modified using m factors.

This process is explained in the GI-199SRA.The SCDF is calculated as:SCDF P(a)*L dH(a) dada Iwhere 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 performthe numerical integration.

The failure probability, p(a), at each acceleration level is calculated asfollows:P~)= (DI)ln(a

/ Am)p(a) __ _where D[ = Standard normal cumulative distribution functiona Seismic acceleration (g)Am = Plant/component median capacity (g)Pc = Logarithmic composite standard deviation (uncertainty) of theresponse 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 seismicacceleration for the interval i to i+lfa)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 theplant/component failure probability (which is evaluated at the average acceleration of eachinterval) by the corresponding frequency of exceedance for that interval and summing the resultsover 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 inmore 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 inbetween 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

• EntergyENG REPORT PNPS-RPT-1 1-OOO1Re-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 0.49Plant HCLPF 0.26Plant Composite Uncertainty, Pc 0.27Frequency of Failure Delta RiskSeismic Level (g) Exceedance Probability at g level0.015 6.76E-03 9.21E-38 5.14E-410.016 6.21E-03 1.76E-36 7.34E-400.017 5.79E-03 2.71E-35 9.93E-390.018 5.42E-03 3.42E-34 1.11 E-370.019 5.1OE-03 3.63E-33 1.06E-360.020 4.81E-03 3.31E-32 5.96E-360.021 4.63E-03 2.63E-31 8.71 E-350.022 4.30E-03 1.85E-30 4.12E-340.023 4.07E-03 1.1 6E-29 2.35E-330.024 3.87E-03 6.61 E-29 1.22E-320.025 3.69E-03 3.43E-28 5.80E-320.026 3.52E-03 1.64E-27 2.54E-310.027 3.36E-03 7.22E-27 1.04E-300.028 3.22E-03 2.97E-26 3.06E-300.029 3.12E-03 1.1 5E-25 1.81 E-290.030 2.96E-03 4.16E-25 4.92E-290.031 2.84E-03 1.43E-24 1.57E-280.032 2.73E-03 4.65E-24 4.77E-280.033 2.63E-03 1.44E-23 1.38E-270.034 2.53E-03 4.28E-23 3.84E-270.035 2.44E-03 1.22E-22 1.02E-260.036 2.36E-03 3.33E-22 2.63E-260.037 2.28E-03 8.76E-22 6.52E-260.038 2.20E-03 2.23E-21 1.56E-250.039 2.13E-03 5.48E-21 4.08E-250.040 2.06E-03 1.31 E-20 7.34E-250.041 2.OOE-03 3.03E-20 1.85E-240.042 1.94E-03 6.82E-20 3.95E-240.043 1.88E-03 1.50E-19 8.21E-240.044 1.83E-03 3.20E-19 1.67E-23Last EXCEL spreadsheet rows are shown below:1.872 6.02E-07 1.OOE+00 1.26E-091.873 6.01E-07 1.OOE+00 1.75E-091.874 5.99E-07 1.OOE+00 5.99E-07AnnualAcceleration Frequency of(g) Exceedance 0.015 6.76E-030.021 4.63E-030.029 3.12E-030.040 2.06E-030.056 1.34E-030.077 8.68E-040.106 5.55E-040.145 3.52E-040.196 2.23E-040.261 1.38E-040.341 8.57E-050.420 5.23E-050.516 3.11E-050.628 1.77E-050.794 9.51 E-060.900 7.08E-061.046 4.65E-061.383 1.96E-061.874 5.99E-07Page 3 of 23 EntergyENG REPORT PNPS-RPT-1 1-00001Re-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-05Plant Median Capacity 0.7595Plant HCLPF nraPlant Composite Uncertainty, Pc 0.27Frequency of Failure Delta RiskSeismic Level (g) Exceedance Probability at g level0.018 1.04E-02 2.25E-43 1.48E-460.019 9.78E-03 3.28E-42 1.56E-450.020 9.31 E-03 4.03E-41 1.74E-440.021 8.88E-03 4.26E-40 1.67E-430.022 8.48E-03 3.93E-39 1.41 E-420.023 8.13E-03 3.20E-38 1.05E-410.024 7.80E-03 2.33E-37 7.08E-410.025 7.49E-03 1.54E-36 4.31 E-400.026 7.21 E-03 9.23E-36 1.35E-390.027 7.07E-03 5.08E-35 1.94E-380.028 6.68E-03 2.59E-34 6.25E-380.029 6.44E-03 1.23E-33 2.76E-370.030 6.22E-03 5.43E-33 1.14E-360.031 6.01 E-03 2.26E-32 4.44E-360.032 5.81 E-03 8.87E-32 1.63E-350.033 5.63E-03 3.30E-31 5.71 E-350.034 5.45E-03 1.17E-30 1.90E-340.035 5.29E-03 3.93E-30 6.05E-340.036 5.14E-03 1.27E-29 1.84E-330.037 4.99E-03 3.92E-29 5.39E-330.038 4.85E-03 1.17E-28 1.83E-320.039 4.70E-03 3.34E-28 3.41 E-320.040 4.59E-03 9.25E-28 1.14E-310.041 4.47E-03 2.48E-27 2.89E-310.042 4.36E-03 6.43E-27 7.15E-310.043 4.24E-03 1.62E-26 1.71 E-300.044 4.14E-03 3.97E-26 4.OOE-300.045 4.04E-03 9.46E-26 9.12E-300.046 3.94E-03 2.20E-25 2.02E-290.047 3.85E-03 4.99E-25 4.40E-29Last EXCEL spreadsheet rows are shown below:3.998 7.33E-08 1.OOE+00 9.82E-113.999 7.32E-08 1.OOE+00 9.80E-114.000 7.31 E-08 1.OOE+00 7.31 E-08AnnualAcceleration Frequency of(g) Exceedance 0.018 1.04E-020.027 7.07E-030.039 4.70E-030.058 3.03E-030.087 1.88E-030.129 1.14E-030.192 6.69E-040.279 3.83E-040.396 2.15E-040.544 1.18E-040.686 7.37E-050.730 6.26E-051.045 3.20E-051.256 2.21 E-051.421 1.54E-051.723 6.74E-062.190 2.52E-062.624 7.OOE-074.000 7.31 E-08Page 4 of 23

• EntergyENG REPORT PNPS-RPT-1 1-00001Re-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 iPlant Median Capacity 0.8134Plant HCLPF n/aPlant Composite Uncertainty, Pc 0.27Frequency of Failure Delta RiskSeismic Level (g) Exceedance Probability at g level0.021 1.31E-02 1.42E-41 5.12E-450.022 1.28E-02 1.36E-40 8.33E-440.023 1.21E-02 1.16E-39 6.45E-430.024 1.16E-02 8.77E-39 4.48E-420.025 1.11 E-02 6.OOE-38 2.82E-410.026 1.06E-02 3.73E-37 1.62E-400.027 1.02E-02 2.13E-36 8.53E-400.028 9.77E-03 1.12E-35 4.16E-390.029 9.40E-03 5.48E-35 1.89E-380.030 9.05E-03 2.50E-34 8.07E-380.031 8.73E-03 1.07E-33 3.17E-370.032 8.44E-03 4.34E-33 1.34E-360.033 8.13E-03 1.66E-32 4.70E-360.034 7.85E-03 6.03E-32 1.60E-350.035 7.58E-03 2.09E-31 5.21 E-350.036 7.33E-03 6.91 E-31 1.62E-340.037 7.1OE-03 2.19E-30 4.85E-340.038 6.87E-03 6.68E-30 1.40E-330.039 6.67E-03 1.96E-29 3.87E-330.040 6.47E-03 5.56E-29 1.04E-320.041 6.28E-03 1.52E-28 2.70E-320.042 6.1OE-03 4.04E-28 6.79E-320.043 5.94E-03 1.04E-27 1.66E-310.044 5.78E-03 2.60E-27 3.96E-310.045 5.62E-03 6.34E-27 9.18E-310.046 5.48E-03 1.50E-26 2.72E-300.047 5.30E-03 3.48E-26 3.35E-300.048 5.20E-03 7.87E-26 1.07E-290.049 5.07E-03 1.74E-25 2.26E-290.050 4.94E-03 3.77E-25 4.67E-29Last EXCEL spreadsheet rows are shown below:3.934 6.70E-08 1.OOE+00 7.68E-113.935 6.69E-08 1.OOE+00 7.67E- 113.936 6.69E-08 1.00E+00 6.69E-08AnnualAcceleration Frequency of(g) Exceedance 0.021 1.31 E-020.032 8.44E-030.047 5.30E-030.070 3.21 E-030.104 1.88E-030.154 1.07E-030.227 5.92E-040.321 3.20E-040.461 1.69E-040.636 8.74E-050.823 5.26E-050.899 4.41 E-051.259 2.14E-051.456 1.44E-051.644 9.77E-061.913 4.03E-062.190 1.44E-062.624 4.16E-073.936 6.69E-08Page 5 of 23

• EntergyENG REPORT PNPS-RPT-1 1-00001Re-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-05Plant Median Capacity 0.245Plant HCLPF n/aPlant Composite Uncertainty, Pc 0.27Frequency of Failure Delta RiskSeismic Level (g) Exceedance Probability at g level0.004 1.16E-02 6.86E-50 1.74E-520.005 9.1OE-03 3.29E-45 5.64E-480.006 7.39E-03 1.71E-41 2.04E-440.007 6.19E-03 1.92E-38 1.76E-410.008 5.27E-03 7.09E-36 5.62E-390.009 4.48E-03 1.14E-33 5.60E-370.010 3.99E-03 9.48E-32 4.47E-350.011 3.52E-03 4.70E-30 1.79E-330.012 3.14E-03 1.52E-28 4.79E-320.013 2.82E-03 3.47E-27 8.87E-310.014 2.57E-03 5.88E-26 1.50E-290.015 2.31E-03 7.76E-25 1.62E-280.016 2.1OE-03 8.24E-24 1.48E-270.017 1.92E-03 7.26E-23 1.12E-260.018 1.77E-03 5.42E-22 7.32E-260.019 1.63E-03 3.51 E-21 4.16E-250.020 1.52E-03 2.OOE-20 2.27E-240.021 1.40E-03 1.01E-19 8.71E-240.022 1.32E-03 4.64E-19 3.93E-230.023 1.23E-03 1.94E-18 1.47E-220.024 1.15E-03 7.44E-18 5.1OE-220.025 1.09E-03 2.65E-17 1.64E-210.026 1.02E-03 8.80E-17 4.96E-210.027 9.68E-04 2.74E-16 1.41E-200.028 9.16E-04 8.06E-16 3.79E-200.029 8.69E-04 2.25E-15 9.69E-200.030 8.26E-04 5.97E-15 2.36E-190.031 7.87E-04 1.51E-14 5.53E-190.032 7.50E-04 3.67E-14 9.71 E- 190.033 7.24E-04 8.58E-14 3.76E-18Last EXCEL spreadsheet rows are shown below:4.869 8.58E-09 1.OOE+00 6.99E-124.870 8.58E-09 1.OOE+00 5.58E-124.871 8.57E-09 1.OOE+00 8.57E-09AnnualAcceleration Frequency of(g) Exceedance 0.004 1.16E-020.006 7.39E-030.009 4.48E-030.014 2.57E-030.021 1.40E-030.033 7.24E-040.050 3.58E-040.076 1.71E-040.116 8.09E-050.176 3.81 E-050.274 1.79E-050.415 8.21E-060.520 5.37E-060.643 3.55E-060.964 1.41 E-061.188 8.42E-071.439 5.10E-072.165 1.59E-073.247 4.28E-084.871 8.57E-09Page 6 of 23

• Enter~gy ENG REPORT PNPS-RPT-1 1-00001Reassessment of Pilgrim Seismic Core Damage Frequency Entern Fragility with 2008 USGS Hazard (PGA)Total Seismic Core Damage Frequency

= 1 2.78E-05Plant Median Capacity 0.57Plant HCLPF 0.33Plant Composite Uncertainty, Pc 0.23Frequency of Failure Delta RiskSeismic Level (g) Exceedance Probability at g level0.015 6.76E-03 1.16E-55 6.46E-590.016 6.21E-03 8.03E-54 3.34E-570.017 5.79E-03 4.06E-52 1.49E-550.018 5.42E-03 1.56E-50 5.07E-540.019 5.1OE-03 4.67E-49 1.36E-520.020 4.81E-03 1.13E-47 2.03E-510.021 4.63E-03 2.23E-46 7.38E-500.022 4.30E-03 3.71E-45 8.26E-490.023 4.07E-03 5.26E-44 1.06E-470.024 3.87E-03 6.46E-43 1.19E-460.025 3.69E-03 6.97E-42 1.18E-450.026 3.52E-03 6.66E-41 1.03E-440.027 3.36E-03 5.70E-40 8.17E-440.028 3.22E-03 4.41 E-39 4.54E-430.029 3.12E-03 3.11E-38 4.93E-420.030 2.96E-03 2.01 E-37 2.38E-410.031 2.84E-03 1.20E-36 1.32E-400.032 2.73E-03 6.66E-36 6.83E-400.033 2.63E-03 3.44E-35 3.30E-390.034 2.53E-03 1.67E-34 1.50E-380.035 2.44E-03 7.61 E-34 6.40E-380.036 2.36E-03 3.28E-33 2.59E-370.037 2.28E-03 1.34E-32 9.96E-370.038 2.20E-03 5.20E-32 3.65E-360.039 2.13E-03 1.93E-31 1.43E-350.040 2.06E-03 6.82E-31 3.83E-350.041 2.OOE-03 2.32E-30 1.42E-340.042 1.94E-03 7.56E-30 4.38E-340.043 1.88E-03 2.38E-29 1.30E-330.044 1.83E-03 7.21 E-29 3.75E-33Last EXCEL spreadsheet rows are shown below:1.872 6.02E-07 1.OOE+00 1.26E-091.873 6.01 E-07 1.00E+00 1.75E-091.874 5.99E-07 1.00E+00 5.99E-07AnnualAcceleration Frequency of(g) Exceedance 0.015 6.76E-030.021 4.63E-030.029 3.12E-030.040 2.06E-030.056 1.34E-030.077 8.68E-040.106 5.55E-040.145 3.52E-040.196 2.23E-040.261 1.38E-040.341 8.57E-050.420 5.23E-050.516 3.11E-050.628 1.77E-050.794 9.51 E-060.900 7.08E-061.046 4.65E-061.383 1.96E-061.874 5.99E-07Page 7 of 23

• EntergyENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Enterev Fragility with 2008 USGS Hazard (10Hz)Total Seismic Core Damage Frequency

= I 4.88E-05Plant Median Capacity 0.8835Plant HCLPF n/aPlant Composite Uncertainty, pc 0.23Frequency of Failure Delta RiskSeismic Level (g) Exceedance Probability at g level0.018 1.04E-02 1.04E-63 6.84E-670.019 9.78E-03 4.83E-62 2.30E-650.020 9.31E-03 1.76E-60 7.59E-640.021 8.88E-03 5.17E-59 2.03E-620.022 8.48E-03 1.25E-57 4.49E-610.023 8.13E-03 2.54E-56 8.36E-600.024 7.80E-03 4.40E-55 1.33E-580.025 7.49E-03 6.59E-54 1.85E-570.026 7.21E-03 8.66E-53 1.27E-560.027 7.07E-03 1.01 E-51 3.84E-550.028 6.68E-03 1.05E-50 2.52E-540.029 6.44E-03 9.79E-50 2.20E-530.030 6.22E-03 8.34E-49 1.75E-520.031 6.01E-03 6.49E-48 1.28E-510.032 5.81E-03 4.65E-47 8.58E-510.033 5.63E-03 3.09E-46 5.35E-500.034 5.45E-03 1.91 E-45 3.11 E-490.035 5.29E-03 1.10E-44 1.69E-480.036 5.14E-03 5.96E-44 8.66E-480.037 4.99E-03 3.04E-43 4.18E-470.038 4.85E-03 1.47E-42 2.30E-460.039 4.70E-03 6.71 E-42 6.85E-460.040 4.59E-03 2.92E-41 3.59E-450.041 4.47E-03 1.21 E-40 1.42E-440.042 4.36E-03 4.81 E-40 5.35E-440.043 4.24E-03 1.83E-39 1.94E-430.044 4.14E-03 6.70E-39 6.76E-430.045 4.04E-03 2.36E-38 2.27E-420.046 3.94E-03 8.OOE-38 7.36E-420.047 3.85E-03 2.62E-37 2.31 E-41Last EXCEL spreadsheet rows are shown below:3.998 7.33E-08 1.OOE+00 9.82E-113.999 7.32E-08 1.OOE+00 9.80E-114.000 7.31 E-08 1.OOE+00 7.31 E-08AnnualAcceleration Frequency of(g) Exceedance 0.018 1.04E-020.027 7.07E-030.039 4.70E-030.058 3.03E-030.087 1.88E-030.129 1.14E-030.192 6.69E-040.279 3.83E-040.396 2.15E-040.544 1.18E-040.686 7.37E-050.730 6.26E-051.045 3.20E-051.256 2.21E-051.421 1.54E-051.723 6.74E-062.190 2.52E-062.624 7.OOE-074.000 7.31 E-08Page 8 of 23

• EntergyENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Enterev Fragilitv with 2008 USGS Hazard (5Hz)Total Seismic Core Damage Frequency

= I 4.36E-05Plant Median Capacity 0.9462Plant HCLPF n/aPlant Composite Uncertainty, Pc 0.23Frequency of Failure Delta RiskSeismic Level (g) Exceedance Probability at g level0.021 1.31E-02 3.93E-61 1.42E-640.022 1.28E-02 1.01 E-59 6.16E-630.023 1.21E-02 2.17E-58 1.21E-610.024 1.16E-02 3.96E-57 2.02E-600.025 1.11E-02 6.25E-56 2.94E-590.026 1.06E-02 8.62E-55 3.74E-580.027 1.02E-02 1.05E-53 4.21 E-570.028 9.77E-03 1.14E-52 4.25E-560.029 9.40E-03 1.12E-51 3.87E-550.030 9.05E-03 9.96E-51 3.21E-540.031 8.73E-03 8.09E-50 2.38E-530.032 8.44E-03 6.04E-49 1.87E-520.033 8.13E-03 4.17E-48 1.1 8E-510.034 7.85E-03 2.67E-47 7.09E-510.035 7.58E-03 1.60E-46 3.99E-500.036 7.33E-03 8.97E-46 2.11 E-490.037 7.1OE-03 4.74E-45 1.05E-480.038 6.87E-03 2.37E-44 4.94E-480.039 6.67E-03 1.12E-43 2.21E-470.040 6.47E-03 5.03E-43 9.40E-470.041 6.28E-03 2.16E-42 3.82E-460.042 6.1 OE-03 8.82E-42 1.48E-450.043 5.94E-03 3.46E-41 5.53E-450.044 5.78E-03 1.30E-40 1.98E-440.045 5.62E-03 4.72E-40 6.83E-440.046 5.48E-03 1.65E-39 2.98E-430.047 5.30E-03 5.55E-39 5.34E-430.048 5.20E-03 1.81 E-38 2.46E-420.049 5.07E-03 5.70E-38 7.40E-420.050 4.94E-03 1.74E-37 2.16E-41Last EXCEL spreadsheet rows are shown below:3.934 6.70E-08 1.00E+00 7.68E-113.935 6.69E-08 1.OOE+00 7.67E-113.936 6.69E-08 1.OOE+00 I 6.69E-08XAnnualAcceleration Frequency of(g) Exceedance 0.021 1.31 E-020.032 8.44E-030.047 5.30E-030.070 3.21 E-030.104 1.88E-030.154 1.07E-030.227 5.92E-040.321 3.20E-040.461 1.69E-040.636 8.74E-050.823 5.26E-050.899 4.41 E-051.259 2.14E-051.456 1.44E-051.644 9.77E-061.913 4.03E-062.190 1.44E-062.624 4.16E-073.936 6.69E-08Page 9 of 23

• EntergyENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Enterev Fragility with 2008 USGS Hazard (1Hz)Total Seismic Core Damage Frequency

= 1.79E-05Plant Median Capacity 0.285Plant HCLPF -n/aPlant Composite Uncertainty, P3c 0.23Frequency of Failure Delta RiskSeismic Level (g) Exceedance Probability at g level0.004 1.16E-02 5.03E-73 1.27E-750.005 9.10E-03 2.47E-66 4.22E-690.006 7.39E-03 5.13E-61 6.12E-640.007 6.19E-03 1.21E-56 1.12E-590.008 5.27E-03 5.93E-53 4.69E-560.009 4.48E-03 8.78E-50 4.32E-530.010 3.99E-03 5.13E-47 2.42E-500.011 3.52E-03 1.42E-44 5.43E-480.012 3.14E-03 2.16E-42 6.78E-460.013 2.82E-03 1.97E-40 5.05E-440.014 2.57E-03 1.19E-38 3.02E-420.015 2.31E-03 4.97E-37 1.04E-400.016 2.1 OE-03 1.53E-35 2.73E-390.017 1.92E-03 3.59E-34 5.55E-380.018 1.77E-03 6.66E-33 8.99E-370.019 1.63E-03 1.01E-31 1.19E-350.020 1.52E-03 1.26E-30 1.43E-340.021 1.40E-03 1.35E-29 1.16E-330.022 1.32E-03 1.24E-28 1.05E-320.023 1.23E-03 9.98E-28 7.59E-320.024 1.15E-03 7.13E-27 4.88E-310.025 1.09E-03 4.56E-26 2.83E-300.026 1.02E-03 2.64E-25 1.49E-290.027 9.68E-04 1.40E-24 7.18E-290.028 9.16E-04 6.80E-24 3.19E-280.029 8.69E-04 3.06E-23 1.32E-270.030 8.26E-04 1.28E-22 5.09E-270.031 7.87E-04 5.04E-22 1.84E-260.032 7.50E-04 1.86E-21 4.92E-260.033 7.24E-04 6.49E-21 2.84E-25Last EXCEL spreadsheet rows are shown below:4.869 8.58E-09 1.OOE+00 6.99E-124.870 8.58E-09 1.OOE+00 5.58E-124.871 8.57E-09 I 1.OOE+00 8.57E-09PAnnualAcceleration Frequency of(g) Exceedance 0.004 1.16E-020.006 7.39E-030.009 4.48E-030.014 2.57E-030.021 1.40E-030.033 7.24E-040.050 3.58E-040.076 1.71 E-040.116 8.09E-050.176 3.81 E-050.274 1.79E-050.415 8.21E-060.520 5.37E-060.643 3.55E-060.964 1.41 E-061.188 8.42E-071.439 5.1 OE-072.165 1.59E-073.247 4.28E-084.871 8.57E-09Page 10 of 23

• EntergyENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Enteri Fragility

-SHIP Adiusted with 2008 USGS Hazard (PGA)Total Seismic Core Damage Frequency

= I 2.14E-05Plant Median Capacity 0.63Plant HCLPF 0.37Plant Composite Uncertainty, Pc 0.23Frequency of Failure Delta RiskSeismic Level (g) Exceedance Probability at g level0.015 6.76E-03 1.12E-58 6.24E-620.016 6.21E-03 8.73E-57 3.63E-600.017 5.79E-03 4.94E-55 1.81E-580.018 5.42E-03 2.10E-53 6.84E-570.019 5.1 OE-03 6.95E-52 2.02E-550.020 4.81E-03 1.84E-50 3.31 E-540.021 4.63E-03 3.99E-49 1.32E-520.022 4.30E-03 7.23E-48 1.61E-510.023 4.07E-03 1.11 E-46 2.25E-500.024 3.87E-03 1.48E-45 2.73E-490.025 3.69E-03 1.72E-44 2.91 E-480.026 3.52E-03 1.77E-43 2.75E-470.027 3.36E-03 1.62E-42 2.32E-460.028 3.22E-03 1.34E-41 1.38E-450.029 3.12E-03 1.01E-40 1.60E-440.030 2.96E-03 6.96E-40 8.24E-440.031 2.84E-03 4.41 E-39 4.86E-430.032 2.73E-03 2.59E-38 2.66E-420.033 2.63E-03 1.42E-37 1.36E-410.034 2.53E-03 7.27E-37 6.52E-410.035 2.44E-03 3.50E-36 2.94E-400.036 2.36E-03 1.59E-35 1.26E-390.037 2.28E-03 6.82E-35 5.08E-390.038 2.20E-03 2.78E-34 1.95E-380.039 2.13E-03 1.08E-33 8.05E-380.040 2.06E-03 4.02E-33 2.26E-370.041 2.OOE-03 1.43E-32 8.73E-370.042 1.94E-03 4.88E-32 2.82E-360.043 1.88E-03 1.60E-31 8.79E-360.044 1.83E-03 5.07E-31 2.64E-35Last EXCEL spreadsheet rows are shown below:1.872 6.02E-07 1.OOE+00 1.26E-091.873 6.01E-07 1.OOE+00 1.75E-091.874 5.99E-07 1.00E+00 5.99E-07fAnnualAcceleration Frequency of(g) Exceedance 0.015 6.76E-030.021 4.63E-030.029 3.12E-030.040 2.06E-030.056 1.34E-030.077 8.68E-040.106 5.55E-040.145 3.52E-040.196 2.23E-040.261 1.38E-040.341 8.57E-050.420 5.23E-050.516 3.11E-050.628 1.77E-050.794 9.51E-060.900 7.08E-061.046 4.65E-061.383 1.96E-061.874 5.99E-07Page 1I of 23

• EntergyENG REPORT PNPS-RPT-11-O0001 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 IPlant Median Capacity 0.9765Plant HCLPF n/aPlant Composite Uncertainty, P3c 0.23Frequency of Failure Delta RiskSeismic Level (g) Exceedance Probability at g level0.018 1.04E-02 6.17E-67 4.04E-700.019 9.78E-03 3.15E-65 1.50E-680.020 9.31E-03 1.26E-63 5.44E-670.021 8.88E-03 4.05E-62 1.59E-650.022 8.48E-03 1.07E-60 3.83E-640.023 8.13E-03 2.35E-59 7.75E-630.024 7.80E-03 4.41 E-58 1.34E-610.025 7.49E-03 7.13E-57 2.OOE-600.026 7.21E-03 1.01E-55 1.48E-590.027 7.07E-03 1.25E-54 4.78E-580.028 6.68E-03 1.39E-53 3.36E-570.029 6.44E-03 1.39E-52 3.13E-560.030 6.22E-03 1.26E-51 2.65E-550.031 6.01E-03 1.05E-50 2.05E-540.032 5.81 E-03 7.95E-50 1.47E-530.033 5.63E-03 5.58E-49 9.67E-530.034 5.45E-03 3.64E-48 5.94E-520.035 5.29E-03 2.22E-47 3.41 E-510.036 5.14E-03 1.27E-46 1.84E-500.037 4.99E-03 6.80E-46 9.35E-500.038 4.85E-03 3.45E-45 5.39E-490.039 4.70E-03 1.65E-44 1.69E-480.040 4.59E-03 7.55E-44 9.29E-480.041 4.47E-03 3.28E-43 3.83E-470.042 4.36E-03 1.36E-42 1.51 E-460.043 4.24E-03 5.42E-42 5.74E-460.044 4.14E-03 2.07E-41 2.09E-450.045 4.04E-03 7.58E-41 7.31 E-450.046 3.94E-03 2.68E-40 2.47E-440.047 3.85E-03 9.15E-40 8.05E-44Last EXCEL spreadsheet rows are shown below:3.998 7.33E-08 1.00E+00 9.82E-113.999 7.32E-08 1.OOE+00 9.80E-1 14.000 7.31E-08 1.00E+00 7.31E-08AnnualAcceleration Frequency of(g) Exceedance 0.018 1.04E-020.027 7.07E-030.039 4.70E-030.058 3.03E-030.087 1.88E-030.129 1.14E-030.192 6.69E-040.279 3.83E-040.396 2.15E-040.544 1.18E-040.686 7.37E-050.730 6.26E-051.045 3.20E-051.256 2.21E-051.421 1.54E-051.723 6.74E-062.190 2.52E-062.624 7.OOE-074.000 7.31 E-08Page 12 of 23

• EntergyENG REPORT PNPS-RPT-1 1-00001Re-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 IPlant Median Capacity 1.0458Plant HCLPF n/aPlant Composite Uncertainty, Pc 0.23Frequency of Failure Delta RiskSeismic Level (g) Exceedance Probability at g level0.021 1.31E-02 2.71E-64 9.80E-680.022 1.28E-02 7.57E-63 4.63E-660.023 1.21 E-02 1.76E-61 9.84E-650.024 1.16E-02 3.49E-60 1.78E-630.025 1.11E-02 5.94E-59 2.79E-620.026 1.06E-02 8.81 E-58 3.82E-610.027 1.02E-02 1.15E-56 4.61E-600.028 9.77E-03 1.34E-55 4.98E-590.029 9.40E-03 1.40E-54 4.84E-580.030 9.05E-03 1.33E-53 4.27E-570.031 8.73E-03 1.14E-52 3.37E-560.032 8.44E-03 9.06E-52 2.80E-550.033 8.13E-03 6.62E-51 1.87E-540.034 7.85E-03 4.49E-50 1.19E-530.035 7.58E-03 2.83E-49 7.07E-530.036 7.33E-03 1.68E-48 3.93E-520.037 7.1OE-03 9.32E-48 2.06E-510.038 6.87E-03 4.89E-47 1.02E-500.039 6.67E-03 2.42E-46 4.79E-500.040 6.47E-03 1.14E-45 2.14E-490.041 6.28E-03 5.13E-45 9.08E-490.042 6.10E-03 2.19E-44 3.69E-480.043 5.94E-03 8.99E-44 1.44E-470.044 5.78E-03 3.53E-43 5.37E-470.045 5.62E-03 1.33E-42 1.93E-460.046 5.48E-03 4.85E-42 8.78E-460.047 5.30E-03 1.70E-41 1.64E-450.048 5.20E-03 5.76E-41 7.83E-450.049 5.07E-03 1.89E-40 2.45E-440.050 4.94E-03 6.OOE-40 7.44E-44Last EXCEL spreadsheet rows are shown below:3.934 6.70E-08 1.OOE+00 7.68E- 113.935 6.69E-08 1.OOE+00 7.67E-113.936 6.69E-08 1.OOE+00 6.69E-08AnnualAcceleration Frequency of(g) Exceedance 0.021 1.31 E-020.032 8.44E-030.047 5.30E-030.070 3.21E-030.104 1.88E-030.154 1.07E-030.227 5.92E-040.321 3.20E-040.461 1.69E-040.636 8.74E-050.823 5.26E-050.899 4.41 E-051.259 2.14E-051.456 1.44E-051.644 9.77E-061.913 4.03E-062.190 1.44E-062.624 4.16E-073.936 6.69E-08Page 13 of 23

• EntergyENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency EnterLy Fragilitv

-SHIP Adjusted with 2008 USGS Hazard (1Hz)Total Seismic Core Damage Frequency

= I 1.49E-05Plant Median Capacity 0.315Plant HCLPF n/aPlant Composite Uncertainty, Pc 0.23Frequency of Failure Delta RiskSeismic Level (g) Exceedance Probability at g level0.004 1.16E-02 1.74E-76 4.42E-790.005 9.1OE-03 1.25E-69 2.14E-720.006 7.39E-03 3.56E-64 4.25E-670.007 6.19E-03 1.1OE-59 1.02E-620.008 5.27E-03 6.82E-56 5.40E-590.009 4.48E-03 1.25E-52 6.13E-560.010 3.99E-03 8.78E-50 4.14E-530.011 3.52E-03 2.89E-47 1.1OE-500.012 3.14E-03 5.13E-45 1.61 E-480.013 2.82E-03 5.43E-43 1.39E-460.014 2.57E-03 3.73E-41 9.48E-450.015 2.31E-03 1.77E-39 3.70E-430.016 2.1OE-03 6.12E-38 1 .1OE-410.017 1.92E-03 1.61 E-36 2.49E-400.018 1.77E-03 3.31 E-35 4.47E-390.019 1.63E-03 5.52E-34 6.54E-380.020 1.52E-03 7.62E-33 8.65E-370.021 1.40E-03 8.88E-32 7.64E-360.022 1.32E-03 8.89E-31 7.54E-350.023 1.23E-03 7.77E-30 5.91 E-340.024 1.15E-03 6.OOE-29 4.12E-330.025 1.09E-03 4.14E-28 2.57E-320.026 1.02E-03 2.58E-27 1.45E-310.027 9.68E-04 1.46E-26 7.52E-310.028 9.16E-04 7.61E-26 3.57E-300.029 8.69E-04 3.66E-25 1.58E-290.030 8.26E-04 1.63E-24 6.47E-290.031 7.87E-04 6.80E-24 2.49E-280.032 7.50E-04 2.66E-23 7.04E-280.033 7.24E-04 9.82E-23 4.30E-27Last EXCEL spreadsheet rows are shown below:4.869 8.58E-09 1.OOE+00 6.99E-124.870 8.58E-09 1.OOE+00 5.58E-124.871 8.57E-09 1.OOE+00 8.57E-09AnnualAcceleration Frequency of(g) Exceedance 0.004 1.16E-020.006 7.39E-030.009 4.48E-030.014 2.57E-030.021 1.40E-030.033 7.24E-040.050 3.58E-040.076 1.71E-040.116 8.09E-050.176 3.81E-050.274 1.79E-050.415 8.21E-060.520 5.37E-060.643 3.55E-060.964 1.41E-061.188 8.42E-071.439 5.10E-072.165 1.59E-073.247 4.28E-084.871 8.57E-09Page 14 of 23 EntergyENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency NRC GI-199 SRA Fragility with 2010 EPRI Hazard (PGA)Total Seismic Core e F = 3.E06Plant Median Capacity 0.49Plant HCLPF 0.261Plant Composite Uncertainty, Pc 0.27Frequency of Failure Delta RiskSeismic Level (g) Exceedance Probability at g level0.001 1 .15E-04 1.11E-108 0.OOE+000.0015 1.15E-04 5.06E-97 0.OOE+000.002 1.15E-04 2.12E-85 0.OOE+000.003 1.1 5E-04 3.96E-75 1.61 E-940.004 1.15E-04 6.77E-68

-2.75E-87 0.005 1.15E-04 2.17E-62 8.83E-820.006 1 .15E-04 5.47E-58

-2.22E-77 0.007 1.1 5E-04 2.38E-54 9.68E-740.008 1.15E-04 2.88E-51 0.OOE+000.009 1.15E-04 1.32E-48

-5.37E-68 0.010 1.1 5E-04 2.84E-46 1.1 5E-650.011 1.15E-04 3.33E-44 0.OOE+000.012 1.15E-04 2.37E-42 0.OOE+000.013 1.15E-04 1.12E-40 0.OOE+000.014 1.1 5E-04 3.72E-39

-1.51E-58 0.015 1.15E-04 9.21E-38 3.74E-570.016 1.15E-04 1.76E-36 0.OOE+000.017 1.15E-04 2.71E-35 0.OOE+000.018 1.15E-04 3.42E-34 0.OOE+000.019 1.15E-04 3.63E-33

-1.48E-52 0.020 1.1 5E-04 3.31 E-32 1.35E-510.021 1.15E-04 2.63E-31 0.OOE+000.022 1.15E-04 1.85E-30 0.OOE+000.023 1.15E-04 1.16E-29 0.OOE+000.024 1.15E-04 6.61E-29 0.OOE+000.025 1.15E-04 3.43E-28 0.OOE+000.026 1.15E-04 1.64E-27 0.OOE+000.027 1.15E-04 7.22E-27 0.OOE+000.028 1.15E-04 2.97E-26 0.OOE+000.029 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-129.999 5.97E-09 1.OOE+00 2.66E-1210.000 5.97E-09 I 1.OOE+00 5.97E-09AnnualAcceleration Frequency of(g) Exceedance 0.001 1.15E-040.0015 1.15E-040.002 1.15E-040.003 1.15E-040.005 1.15E-040.007 1.15E-040.01 1.15E-040.015 1.15E-040.02 1.15E-040.03 1.15E-040.05 1.15E-040.07 1.11 E-040.1 1.02E-040.15 8.59E-050.2 7.20E-050.3 5.22E-050.5 2.99E-050.7 1.83E-051 9.54E-061.5 3.98E-062 1.95E-063 6.19E-075 1.1OE-077 2.92E-0810 5.97E-09Page 15 of 23

• EntergyENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency NRC GI-199 SRA Fragility with 2010 EPRI Hazard (10Hz)Total Seismic Core uen = 2.74E-0Plant Median Capacity 0.7595Plant HCLPF n/aPlant Composite Uncertainty, 03c 0.27Frequency of Failure Delta RiskSeismic Level (g) Exceedance Probability at g level0.001 1.1 5E-04 7.15E-125 0.OOE+000.0015 1.15E-04 2.44E-112 0.OOE+000.002 1.15E-04 8.70E-100 0.OOE+000.003 1.15E-04 1.22E-88 4.97E-108 0.004 1.15E-04 9.42E-81

-3.83E-100 0.005 1.15E-04 1.01E-74 4.09E-940.006 1.15E-04 6.90E-70

-2.80E-89 0.007 1.15E-04 7.07E-66 2.88E-850.008 1.15E-04 1.81E-62 0.OOE+000.009 1.15E-04 1.62E-59

-6.57E-79 0.010 1.15E-04 6.33E-57 2.57E-760.011 1.1 5E-04 1.28E-54 0.OOE+000.012 1.1 5E-04 1.50E-52 0.OOE+000.013 1.15E-04 1.12E-50 0.OOE+000.014 1.15E-04 5.72E-49

-2.32E-68 0.015 1.15E-04 2.11E-47 8.57E-670.016 1.15E-04 5.87E-46 0.OOE+000.017 1.1 5E-04 1.28E-44 0.OOE+000.018 1.15E-04 2.25E-43 0.OOE+000.019 1.1 5E-04 3.28E-42

-1.33E-61 0.020 1.15E-04 4.03E-41 1.64E-600.021 1.15E-04 4.26E-40 0.OOE+000.022 1.15E-04 3.93E-39 0.OOE+000.023 1.1 5E-04 3.20E-38 0.OOE+000.024 1.15E-04 2.33E-37 0.OOE+000.025 1.15E-04 1.54E-36 0.OOE+000.026 1.15E-04 9.23E-36 0.OOE+000.027 1.15E-04 5.08E-35 0.OOE+000.028 1.15E-04 2.59E-34 0.OOE+000.029 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 19.999 5.28E-08 1.OOE+00 1.71 E-1110.000 5.28E-08 1.OOE+00 5.28E-08AnnualAcceleration Frequency of(g) Exceedance 0.001 1.15E-040.0015 1.15E-040.002 1.15E-040.003 1.1 5E-040.005 1.15E-040.007 1.1 5E-040.01 1.15E-040.015 1.15E-040.02 1.15E-040.03 1.15E-040.05 1.15E-040.07 1.13E-040.1 1.09E-040.15 9.93E-050.2 8.84E-050.3 6.94E-050.5 4.43E-050.7 2.98E-051 1.76E-051.5 8.47E-062 4.65E-063 1.80E-065 4.59E-077 1.68E-0710 5.28E-08Page 16 of 23

• EntergyENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency NRC GI-199 SRA Fragility with 2010 EPRI Hazard (1Hz)Total Seismic Core Damae F = 1.87EPlant Median Capacity 0.245Plant HCLPF n/aPlant Composite Uncertainty, 13c 0.27Frequency of Failure Delta RiskSeismic Level (g) Exceedance Probability at g level0.001 1.15E-04 2.12E-85 0.OOE+000.0015 1.15E-04 3.96E-75 0.OOE+000.002 1.15E-04 5.64E-65 5.64E-710.003 1.14E-04 4.34E-56 7.38E-620.004 1.12E-04 6.86E-50 8.93E-560.005 1.11 E-04 3.29E-45 9.01 E-510.006 1.08E-04 1.71 E-41 3.86E-470.007 1.06E-04 1.92E-38 6.63E-440.008 1.03E-04 7.09E-36 2.10E-410.009 9.96E-05 1.14E-33 2.93E-390.010 9.70E-05 9.48E-32 3.49E-370.011 9.33E-05 4.70E-30 1.52E-350.012 9.01E-05 1.52E-28 4.38E-340.013 8.72E-05 3.47E-27 8.95E-330.014 8.46E-05 5.88E-26 1.37E-310.015 8.23E-05 7.76E-25 2.38E-300.016 7.92E-05 8.24E-24 2.29E-290.017 7.65E-05 7.26E-23 1.83E-280.018 7.39E-05 5.42E-22 1.25E-270.019 7.16E-05 3.51E-21 7.46E-270.020 6.95E-05 2.OOE-20 5.36E-260.021 6.68E-05 1.01E-19 2.49E-250.022 6.44E-05 4.64E-19 1.05E-240.023 6.21E-05 1.94E-18 4.06E-240.024 6.OOE-05 7.44E-18 1.45E-230.025 5.80E-05 2.65E-17 4.79E-230.026 5.62E-05 8.80E-17 1.48E-220.027 5.45E-05 2.74E-16 4.33E-220.028 5.30E-05 8.06E-16 1.19E-210.029 5.15E-05 2.25E-15 3.13E-21Last EXCEL spreadsheet rows are shown below:4.998 1.41E-10 1.OOE+00 1.15E-134.999 1.41E-10 1.OOE+00 1.14E-135.000 1.41E-10 1.OOE+00 1.41E-10AnnualAcceleration Frequency of(g) Exceedance 0.001 1.15E-040.0015 1.15E-040.002 1.15E-040.003 1.14E-040.005 1.11E-040.007 1.06E-040.01 9.70E-050.015 8.23E-050.02 6.95E-050.03 5.01 E-050.05 2.81 E-050.07 1.74E-050.1 9.61 E-060.15 4.49E-060.2 2.49E-060.3 1.02E-060.5 2.99E-070.7 1.24E-071 4.52E-081.5 1.29E-082 4.90E-093 1.12E-095 1.41E-10Page 17 of 23

• EntergyENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Entergy Fragility with 2010 EPRI Hazard (PGA)Tota1 Seismic Core Damg F uen = 2.54E-06Plant Median Capacity 0.57Plant HCLPF 0.334Plant Composite Uncertainty, 03c 0.23Frequency of Failure Delta RiskSeismic Level (g) Exceedance Probability at g level0.001 1.15E-04 2.02E-156 0.OOE+000.0015 1.15E-04 5.98E-140 0.OOE+000.002 1.15E-04 1.68E-123 0.OOE+000.003 1. 15E-04 6.10E-109 2.48E-128 0.004 1.15E-04 1.14E-98

-4.62E-118 0.005 1.15E-04 7.68E-91 3.12E-110 0.006 1.15E-04 1.42E-84

-5.76E-104 0.007 1.15E-04 2.17E-79 8.84E-990.008 1.15E-04 5.44E-75 0.OOE+000.009 1.15E-04 3.44E-71

-1.40E-90 0.010 1.15E-04 7.42E-68 3.02E-870.011 1.15E-04 6.75E-65 0.OOE+000.012 1.15E-04 3.03E-62 0.OOE+000.013 1.15E-04 7.59E-60 0.OOE+000.014 1.1 5E-04 1.16E-57

-4.70E-77 0.015 1.15E-04 1.16E-55 4.70E-750.016 1.15E-04 8.03E-54 0.OOE+000.017 1.15E-04 4.06E-52 0.OOE+000.018 1.15E-04 1.56E-50 0.OOE+000.019 1.1 5E-04 4.67E-49

-1.90E-68 0.020 1.15E-04 1.13E-47 4.57E-670.021 1.15E-04 2.23E-46 0.OOE+000.022 1.15E-04 3.71E-45 0.OOE+000.023 1.15E-04 5.26E-44 0.OOE+000.024 1.1 5E-04 6.46E-43 0.OOE+000.025 1.15E-04 6.97E-42 0.OOE+000.026 1.1 5E-04 6.66E-41 0.OOE+000.027 1.15E-04 5.70E-40 0.OOE+000.028 1.15E-04 4.41E-39 0.OOE+000.029 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-129.999 5.97E-09 1.OOE+00 2.66E-1210.000 5.97E-09 1.00E+00 5.97E-09AnnualAcceleration Frequency of(g) Exceedance 0.001 1.15E-040.0015 1.15E-040.002 1.15E-040.003 1.15E-040.005 1.15E-040.007 1.15E-040.01 1.15E-040.015 1.15E-040.02 1.15E-040.03 1.15E-040.05 1.15E-040.07 1.11E-040.1 1.02E-040.15 8.59E-050.2 7.20E-050.3 5.22E-050.5 2.99E-050.7 1.83E-051 9.54E-061.5 3.98E-062 1.95E-063 6.19E-075 1.1OE-077 2.92E-0810 5.97E-09Page 18 of 23

• EntergyENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Entergy Fragility with 2010 EPRI Hazard (10Hz)Total SeimicCore Damg Frqec = I 2.20E-06Plant Median Capacity 0.8835Plant HCLPF n/aPlant Composite Uncertainty, P3c 0.23Frequency of Failure Delta RiskSeismic Level (g) Exceedance Probability at g level0.001 1.15E-04 2.87E-179 0.OOE+000.0015 1.15E-04 1.38E-161 0.OOE+000.002 1.15E-04 7.38E-144 0.OOE+000.003 1.15E-04 4.34E-128 1.76E-147 0.004 1.1 5E-04 6.46E-1 17 -2.63E-1 360.005 1.15E-04 2.29E-108 9.31E-128 0.006 1.1 5E-04 1.68E-101

-6.84E-1 210.007 1.15E-04 8.42E-96 3.42E-115 0.008 1.15E-04 5.93E-91 0.OOE+000.009 1.15E-04 9.40E-87

-3.82E-106 0.010 1.1 5E-04 4.63E-83 1.88E-102 0.011 1.15E*04 8.94E-80 0.OOE+000.012 1.15E-04 8.OOE-77 0.OOE+000.013 1.15E-04 3.78E-74 0.OOE+000.014 1.15E-04 1.04E-71

-4.22E-91 0.015 1.15E-04 1.80E-69 7.32E-890.016 1.15E-04 2.1OE-67 0.OOE+000.017 1.15E-04 1.72E-65 0.OOE+000.018 1.15E-04 1.04E-63 0.OOE+000.019 1.1 5E-04 4.83E-62

-1.97E-81 0.020 1.15E-04 1.76E-60 7.16E-800.021 1.15E-04 5.17E-59 0.OOE+000.022 1.15E-04 1.25E-57 0.OOE+000.023 1.15E-04 2.54E-56 0.OOE+000.024 1.15E-04 4.40E-55 0.OOE+000.025 1.15E-04 6.59E-54 0.OOE+000.026 1.15E-04 8.66E-53 0.OOE+000.027 1.1 5E-04 1.01 E-51 0.OOE+000.028 1.15E-04 1.05E-50 0.OOE+000.029 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 19.999 5.28E-08 1.OOE+00 1.71E-1110.000 5.28E-08 1.OOE+00 5.28E-08AnnualAcceleration Frequency of(g) Exceedance 0.001 1.15E-040.0015 1.15E-040.002 1.15E-040.003 1.15E-040.005 1.15E-040.007 1.15E-040.01 1.15E-040.015 1.15E-040.02 1.15E-040.03 1.15E-040.05 1.15E-040.07 1.13E-040.1 1.09E-040.15 9.93E-050.2 8.84E-050.3 6.94E-050.5 4.43E-050.7 2.98E-051 1.76E-051.5 8.47E-062 4.65E-063 1.80E-065 4.59E-077 1.68E-0710 5.28E-08Page 19 of 23

• EntergENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Entergy Fragility with 2010 EPRI Hazard (1Hz)Total Seismic Core a Frquenc = I .29E-06Plant Median Capacity 0.285Plant HCLPF n/aPlant Composite Uncertainty, Pc 0.23Frequency of Failure Delta RiskSeismic Level (g) Exceedance Probability at g level0.001 1.15E-04 1.68E-123 0.OOE+000.0015 1.15E-04 6.10E-109 0.00E+000.002 1.15E-04 1.61E-94 1.61E-100 0.003 1.14E-04 7.21 E-82 1.22E-870.004 1.12E-04 5.03E-73 6.54E-790.005 1.11E-04 2.47E-66 6.75E-720.006 1.08E-04 5.13E-61 1.1 6E-660.007 1.06E-04 1.21 E-56 4.21 E-620.008 1.03E-04 5.93E-53 1.76E-580.009 9.96E-05 8.78E-50 2.26E-550.010 9.70E-05 5.13E-47 1.88E-520.011 9.33E-05 1.42E-44 4.60E-500.012 9.01E-05 2.16E-42 6.20E-480.013 8.72E-05 1.97E-40 5.10E-460.014 8.46E-05 1.19E-38 2.77E-440.015 8.23E-05 4.97E-37 1.52E-420.016 7.92E-05 1.53E-35 4.23E-410.017 7.65E-05 3.59E-34 9.06E-400.018 7.39E-05 6.66E-33 1.54E-380.019 7.16E-05 1.01E-31 2.14E-370.020 6.95E-05 1.26E-30 3.39E-360.021 6.68E-05 1.35E-29 3.32E-350.022 6.44E-05 1.24E-28 2.81 E-340.023 6.21 E-05 9.98E-28 2.09E-330.024 6.OOE-05 7.13E-27 1.39E-320.025 5.80E-05 4.56E-26 8.25E-320.026 5.62E-05 2.64E-25 4.46E-310.027 5.45E-05 1.40E-24 2.21 E-300.028 5.30E-05 6.80E-24 1.01 E-290.029 5.15E-05 3.06E-23 4.26E-29Last EXCEL spreadsheet rows are shown below:4.998 1.41E-10 1.OOE+00 1.15E-134.999 1.41E-10 1.OOE+00 1.14E-135.000 1.41E-10 1.OOE+00 1.41E-10AnnualAcceleration Frequency of(g) Exceedance 0.001 1.15E-040.0015 1.15E-040.002 1.15E-040.003 1.14E-040.005 1.11E-040.007 1.06E-040.01 9.70E-050.015 8.23E-050.02 6.95E-050.03 5.01 E-050.05 2.81 E-050.07 1.74E-050.1 9.61 E-060.15 4.49E-060.2 2.49E-060.3 1.02E-060.5 2.99E-070.7 1.24E-071 4.52E-081.5 1.29E-082 4.90E-093 1.12E-095 1.41E-10Page 20 of 23

• EntergyENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Entergy Fragilitv

-SHIP Adjusted with 2010 EPRI Hazard (PGA)Total Seismic Core D e Frequenc 1.46E-0Plant Median Capacity 0.82Plant HCLPF 0.480Plant Composite Uncertainty, j3c 0.23Frequency of Failure Delta RiskSeismic Level (g) Exceedance Probability at g level0.001 1.15E-04 2.87E-175 0.OOE+000.0015 1.1 5E-04 8.57E-1 58 0.OOE+000.002 1.15E-04 2.78E-140 0.OOE+000.003 1.15E-04 1.02E-124 4.14E-144 0.004 1.15E-04 1.06E-113

-4.32E-133 0.005 1.15E-04 2.84E-105 1.16E-124 0.006 1.15E-04 1.65E-98

-6.71E-118 0.007 1.15E-04 6.75E-93 2.75E-112 0.008 1.15E-04 3.99E-88 0.OOE+000.009 1.15E-04 5.41E-84

-2.20E-103 0.010 1.15E-04 2.31E-80 9.41E-100 0.011 1.15E-04 3.93E-77 0.00E+000.012 1.15E-04 3.13E-74 0.OOE+000.013 1.15E-04 1.33E-71 0.O0E+000.014 1.15E-04 3.30E-69

-1.34E-88 0.015 1.15E-04 5.20E-67 2.12E-860.016 1.15E-04 5.55E-65 0.OOE+000.017 1.15E-04 4.20E-63 0.OOE+000.018 1.15E-04 2.35E-61 0.OOE+000.019 1.15E-04 1.01E-59

-4.11E-79 0.020 1.15E-04 3.43E-58 1.40E-770.021 1.15E-04 9.43E-57 0.OOE+000.022 1.15E-04 2.14E-55 0.OOE+000.023 1 .15E-04 4.09E-54 0.OOE+000.024 1 .15E-04 6.68E-53 0.OOE+000.025 1.15E-04 9.47E-52 0.00E+000.026 1.15E-04 1.1 8E-50 0.OOE+000.027 1.15E-04 1.30E-49 0.OOE+000.028 1.15E-04 1.28E-48 0.OOE+000.029 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-129.999 5.97E-09 1.OOE+00 2.66E-1210.000 5.97E-09 1.OOE+00 5.97E-09AnnualAcceleration Frequency of(g) Exceedance 0.001 1.15E-040.0015 1.15E-040.002 1.15E-040.003 1.15E-040.005 1.15E-040.007 1.15E-040.01 1.15E-040.015 1.15E-040.02 1.15E-040.03 1.15E-040.05 1.15E-040.07 1.11E-040.1 1.02E-040.15 8.59E-050.2 7.20E-050.3 5.22E-050.5 2.99E-050.7 1.83E-051 9.54E-061.5 3.98E-062 1.95E-063 6.19E-075 1.10E-077 2.92E-0810 5.97E-09Page 21 of 23

• EntergyENG REPORT PNPS-RPT-1 1-00001Re-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 IPlant Median Capacity 1.271Plant HCLPF n/aPlant Composite Uncertainty, Pc 0.23Frequency of Failure Delta RiskSeismic Level (g) Exceedance Probability at g level0.001 1.15E-04 2.01E-199 0.OOE+000.0015 1.15E-04 9.73E-181 0.OOE+000.002 1.1 5E-04 6.04E-162 O.OOE+000.003 1.15E-04 3.57E-145 1.45E-164 0.004 1.15E-04 2.99E-133

-1.21E-152 0.005 1.15E-04 4.20E-124 1.71E-143 0.006 1.15E-04 9.69E-1 17 -3.94E-136 0.007 1.15E-04 1.29E-110 5.27E-1 300.008 1.1 5E-04 2.15E-105 0.OOE+000.009 1.15E-04 7.31E-101

-2.97E-120 0.010 1.15E-04 7.16E-97 2.91E-1 160.011 1.15E-04 2.58E-93 0.OOE+000.012 1.15E-04 4.09E-90 0.OOE+000.013 1.15E-04 3.27E-87 0.OOE+000.014 1.1 5E-04 1.47E-84

-5.97E-1 040.015 1.15E-04 4.02E-82 1.63E-101 0.016 1.1 5E-04 7.18E-80 0.OOE+000.017 1.15E-04 8.84E-78 0.OOE+000.018 1.15E-04 7.84E-76 0.OOE+000.019 1.15E-04 5.21E-74

-2.12E-93 0.020 1.15E-04 2.67E-72 1.09E-910.021 1.15E-04 1.09E-70 0.OOE+000.022 1.15E-04 3.59E-69 0.OOE+000.023 1.15E-04 9.82E-68 0.OOE+000.024 1.15E-04 2.26E-66 0.OOE+000.025 1.15E-04 4.46E-65 0.OOE+000.026 1.15E-04 7.62E-64 0.OOE+000.027 1.15E-04 1.14E-62 0.OOE+000.028 1.15E-04 1.52E-61 0.OOE+000.029 1.1 5E-04 1.80E-60

-7.31 E-80Last EXCEL spreadsheet rows are shown below:9.998 5.28E-08 1.OOE+00 1.71E-119.999 5.28E-08 1.00E+00 1.71E-1110.000 5.28E-08 1.00E+00 5.28E-08AnnualAcceleration Frequency of(g) Exceedance 0.001 1.15E-040.0015 1.15E-040.002 1.15E-040.003 1.15E-040.005 1.15E-040.007 1.15E-040.01 1.15E-040.015 1.15E-040.02 1.15E-040.03 1.15E-040.05 1.15E-040.07 1.13E-040.1 1.09E-040.15 9.93E-050.2 8.84E-050.3 6.94E-050.5 4.43E-050.7 2.98E-051 1.76E-051.5 8.47E-062 4.65E-063 1.80E-065 4.59E-077 1.68E-0710 5.28E-08Page 22 of 23

• Enter~gy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage FrequencyFrazilitv

-SHIP Adjusted with 2010 EPRI Hazard (1Hz)Total Seismic Coramg Freqenc 5.57E-07Plant Median Capacity 0.41Plant HCLPF n/aPlant Composite Uncertainty, P3c 0.23Frequency of Failure Delta RiskSeismic Level (g) Exceedance Probability at g level0.001 1.1 5E-04 2.78E-140 0.OOE+000.0015 1.15E-04 1.02E-124 0.OOE+000.002 1.15E-04 3.11E-109 3.11E-115 0.003 1.14E-04 1.40E-95 2.37E-101 0.004 1.12E-04 5.46E-86 7.10E-920.005 1.11E-04 1.06E-78 2.90E-840.006 1.08E-04 6.92E-73 1.57E-780.007 1.06E-04 4.37E-68 1.51 E-730.008 1.03E-04 5.02E-64 1.49E-690.009 9.96E-05 1.59E-60 4.10E-660.010 9.70E-05 1.85E-57 6.78E-630.011 9.33E-05 9.55E-55 3.09E-600.012 9.01E-05 2.56E-52 7.36E-580.013 8.72E-05 3.97E-50 1.02E-550.014 8.46E-05 3.88E-48 9.07E-540.015 8.23E-05 2.57E-46 7.86E-520.016 7.92E-05 1.21 E-44 3.36E-500.017 7.65E-05 4.25E-43 1.07E-480.018 7.39E-05 1.15E-41 2.67E-470.019 7.16E-05 2.50E-40 5.31 E-460.020 6.95E-05 4.41 E-39 1.18E-440.021 6.68E-05 6.51 E-38 1.60E-430.022 6.44E-05 8.17E-37 1.85E-420.023 6.21 E-05 8.86E-36 1.86E-410.024 6.OOE-05 8.41 E-35 1.63E-400.025 5.80E-05 7.07E-34 1.28E-390.026 5.62E-05 5.33E-33 8.99E-390.027 5.45E-05 3.63E-32 5.73E-380.028 5.30E-05 2.25E-31 3.33E-370.029 5.15E-05 1.28E-30 1.78E-36Last EXCEL spreadsheet rows are shown below:4.998 1.41E-10 1.OOE+00 1.15E-134.999 1.41E-10 1.OOE+00 1.14E-135.000 1.41E-10 1.OOE+00 1.41E-10AnnualAcceleration Frequency of(g) Exceedance 0.001 1.15E-040.0015 1.15E-040.002 1.15E-040.003 1.14E-040.005 1.11E-040.007 1.06E-040.01 9.70E-050.015 8.23E-050.02 6.95E-050.03 5.01E-050.05 2.81 E-050.07 1.74E-050.1 9.61E-060.15 4.49E-060.2 2.49E-060.3 1.02E-060.5 2.99E-070.7 1.24E-071 4.52E-081.5 1.29E-082 4.90E-093 1.12E-095 1.41E-10Page 23 of 23 doEntergy ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Attachment 6Email from Martin Stutzke (USNRC) to John Bretti (Entergy) ct-Entergy ENG REPORT PNPS-RPT-i 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Prepared by: Clem Yeh Reviewed by: John BrettiThe 2008 USGS Seismic Hazard Curves for the Entergy plants were transmitted to Entergy bythe 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 PMTo: Bretti, John F

Subject:

RE: Pilgrim Seismic Hazard Curves used in GI-199John -Please find attached an EXCEL spreadsheet that provides the seismic hazard curves used inGI-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 toshare with others at Entergy.

Please note that these are mean values; the USGS has notissued uncertainty information (fractiles,

medians, etc.) for the 2008 estimates.

You can usewww.earthguake.usgs.gov to get more information, including the final report (click on"Hazards"),

Regards,MartyFrom: Bretti, John F [mailto:JBretti(dentergy.com1 Sent: Thursday, April 07, 2011 11:35 AMTo: Stutzke, Martin

Subject:

Pilgrim Seismic Hazard Curves used in GI-199Martin,About a week ago, you had provided Dragos (Dan) Nuta with tabulated exceedance frequencies for theUSGS hazard curves that were used for the Indian Point site. I was wondering if you could provide mewith the corresponding hazard curve data used in GI-199 for Pilgrim Station.Sincerely, John BrettiSenior Lead EngineerEntergy Nuclear914-272-3433 Page 2 of 7 cý-Entergy ENG REPORT PNPS-RPT-I 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Seismic Hazard Curves Used in GI-199Basis: 2008 USGS adjusted for site soil conditions using EPRI/SOG site amplification functions (EPRI NP-6395-D)

PGA 10 Hz 5 Hz 1 Hzexceedence 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-020.0098 5.98E-03 0.0113 8.81E-03 0.0113 1.07E-02 0.0056 9.17E-030.0137 4.33E-03 0.0169 6.03E-03 0.0169 7.01E-03 0.0084 6.21E-030.0192 3.19E-03 0.0253 4.21E-03 0.0253 4.65E-03 0.0127 4.23E-030.0269 2.36E-03 0.0380 2.99E-03 0.0380 3.17E-03 0.0190 2.95E-030.0376 1.67E-03 0.0570 2.09E-03 0.0570 2.17E-03 0.0285 2.05E-030.0527 1.07E-03 0.0854 1.34E-03 0.0854 1.38E-03 0.0427 1.34E-030.0738 6.09E-04 0.1280 7.48E-04 0.1280 7.45E-04 0.0641 7.55E-040.1030 3.13E-04 0.1920 3.60E-04 0.1920 3.35E-04 0.0961 3.50E-040.1450 1.45E-04 0.2880 1.51 E-04 0.2880 1.27E-04 0.1440 1.32E-040.2030 6.33E-05 0.3900 7.34E-05 0.3900 5.61E-05 0.2160 4.11E-050.2840 2.68E-05 0.4320 5.68E-05 0.4320 4.19E-05 0.3240 1.07E-050.3970 1.14E-05 0.6490. 1.94E-05 0.6490 1.23E-05 0.4000 4.83E-060.5560 5.OOE-06 0.8000 1.09E-05 0.8000 6.39E-06 0.4870 2.15E-060.7780 2.23E-06 0.9730 6.31 E-06 0.9730 3.37E-06 0.7300 3.08E-070.9000 1.58E-06 1.4600 1.92E-06 1.4600 8.71E-07 0.9000 1.19E-071.0900 9.71E-07 2.1900 5.16E-07 2.1900 2.37E-07 1.0900 5.53E-081.5200 3.82E-07 3.2800 1.17E-07 3.2800 5.79E-08 1.6400 1.33E-082.1300 1.09E-07 5.0000 1.01 E-08 4.9200 7.72E-09 2.4600 2.59E-093.6900 3.16E-10Fitzpatrick 0.0070 9.06E-03 0.0075 1.60E-02 0.0075 2.04E-02 0.0037 1.52E-020.0098 5.63E-03 0.0113 9.77E-03 0.0113 1.24E-02 0.0056 9.66E-030.0137 3.38E-03 0.0169 5.72E-03 0.0169 7.17E-03 0.0084 5.85E-030.0192 1.96E-03 0.0253 3.17E-03 0.0253 3.89E-03 0.0127 3.32E-030.0269 1.10E-03 0.0380 1.67E-03 0.0380 1.98E-03 0.0190 1.78E-030.0376 6.04E-04 0.0570 8.39E-04 0.0570 9.60E-04 0.0285 8.83E-040.0527 3.23E-04 0.0854 4.08E-04 0.0854 4.42E-04 0.0427 4.05E-040.0738 1.71E-04 0.1280 1.92E-04 0.1280 1.94E-04 0.0641 1.70E-040.1030 9.16E-05 0.1920 8.96E-05 0.1920 8.21E-05 0.0961 6.58E-050.1450 4.91 E-05 0.2880 4.19E-05 0.2880 3.46E-05 0.1440 2.40E-050.2030 2.73E-05 0.3900 2.40E-05 0.3900 1.83E-05 0.2160 8.50E-060.2840 1.55E-05 0.4320 1.99E-05 0.4320 1.48E-05 0.3240 3.04E-060.3970 8.81 E-06 0.6490 9.39E-06 0.6490 6.44E-06 0.4000 1.80E-060.5560 4.87E-06 0.8000 6.32E-06 0.8000 4.17E-06 0.4870 1.10E-060.7780 2.57E-06 0.9730 4.31E-06 0.9730 2.75E-06 0.7300 3.95E-070.9000 1.90E-06 1.4600 1.83E-06 1.4600 1.09E-06 0.9000 2.28E-071.0900 1.23E-06 2.1900 6.72E-07 2.1900 3.81E-07 1.0900 1.36E-071.5200 5.18E-07 3.2800 1.85E-07 3.2800 1.09E-07 1.6400 4.16E-082.1300 1.57E-07 5.0000 1.91E-08 4.9200 1.74E-08 2.4600 1.10E-08I 1 1 3.6900 2.17E-09Page 3 of 7

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

PGA10 Hz5 Hz1 Hz+ 4Grand Gulf0.00970.01350.01880.02590.03600.05000.06960.09370.12460.16100.20710.24420.31760.44480.62240.72000.85021.15521.57625.03E-033.65E-032.63E-031.80E-031.12E-036.34E-043.31 E-041.67E-048.48E-054.32E-052.33E-051.30E-057.43E-064.23E-062.32E-061.74E-061.15E-064.96E-071.53E-070.01250.01880.02770.04120.06120.09060.13490.19200.27070.37150.45630.47950.59060.66400.77841.16801.75202.62404.00007.25E-035.02E-033.54E-032.43E-031.53E-038.69E-044.47E-042.13E-049.74E-054.36E-052.40E-051.96E-058.70E-065.70E-063.81 E-061.63E-066.14E-071.71 E-071.69E-080.01400.02100.03130.04660.06950.10320.15290.21890.31100.44060.55770.60050.75280.78400.87571.16801.75202.62403.93609.60E-036.31 E-034.23E-032.83E-031.77E-039.79E-044.70E-042.03E-048.19E-053.26E-051.66E-051.33E-055.52E-063.53E-062.35E-069.62E-073.47E-071.01 E-071.63E-080.00800.01200.01790.02690.04010.05960.08630.12760.18930.26210.37150.53460.64000.77921.16801.44001.74402.62403.93605.90401.03E-026.95E-034.69E-033.16E-032.11 E-031.31 E-037.03E-043.11E-041.15E-043.65E-051.05E-052.91 E-061.54E-068.75E-073.23E-071.93E-071.1 7E-073.68E-089.90E-091.94E-09I t 1*Indian Point0.00700.00980.01370.01920.02690.03760.05270.07380.10300.14500.20300.28400.39700.55600.77800.90001.09001.52002.13008.02E-035.72E-034.04E-032.82E-031.95E-031.34E-039.06E-046.09E-044.07E-042.65E-041.71E-041.07E-046.46E-053.69E-051.97E-051.46E-059.58E-064.05E-061.24E-060.00750.01130.01690.02530.03800.05700.08540.12800.19200.28800.39000.43200.64900.80000.97301.46002.19003.28005.00001.20E-028.43E-035.86E-033.98E-032.62E-031.69E-031.06E-036.49E-043.87E-042.23E-041.44E-041.24E-046.45E-054.49E-053.13E-051.37E-055.12E-061.42E-061.42E-070.00750.01130.01690.02530.03800.05700.08540.12800.19200.28800.39000.43200.64900.80000.97301.46002.19003.28004.92001.47E-029.73E-036.37E-034.07E-032.52E-031.53E-039.08E-045.26E-042.97E-041.62E-041.01E-048.52E-054.23E-052.87E-051.95E-058.09E-062.91 E-068.50E-071.38E-070.00370.00560.00840.01270.01900.02850.04270.06410.09610.14400.21600.32400.40000.48700.73000.90001.09001.64002.46003.69001.27E-028.13E-034.98E-032.89E-031.63E-038.78E-044.61 E-042.37E-041.21E-046.10E-053.04E-051.47E-059.79E-066.57E-062.68E-061.61 E-069.81 E-073.08E-078.23E-081.60E-08Palisades 0.01480.02070.02880.04013.93E-032.48E-031.46E-038.12E-040.01780.02660.03920.05846.02E-033.82E-032.28E-030.02150.03200.04738.05E-034.97E-032.89E-031.55E-030.00400.00600.00920.01409.78E-036.30E-033.97E-032.39E-031.28E-03 1 0.0698Page 4 of 7

.1Entergy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Seismic Hazard Curves Used in GI-199Basis: 2008 USGS adjusted for site soil conditions using EPRI/SOG site amplification functions (EPRI NP-6395-D) r VPGA10 Hz5 Hz1 Hz0.05600.07710.10650.14460.19570.26100.34100.42030.51610.62830.79360.90001.04641.38321.87444.40E-042.37E-041.26E-046.76E-053.69E-052.04E-051.17E-056.81 E-063.90E-062.13E-061.08E-067.86E-074.97E-071.97E-075.63E-080.08700.12940.19220.27900.39550.54430.68640.73011.04491.25601.42061.72282.19002.62404.00006.90E-043.61 E-041.82E-048.82E-054.12E-051.89E-051.05E-058.63E-063.97E-062.64E-061.77E-067.12E-072.39E-075.81 E-085.05E-090.10370.15390.22720.32130.46080.63650.82290.89861.25911.45601.64441.91262.19002.62403.93607.69E-043.66E-041.67E-047.30E-053.11E-051.31 E-056.92E-065.61 E-062.43E-061.57E-061.01 E-063.74E-071.17E-072.91 E-083.95E-090.02110.03280.04950.07630.1163*0.17570.27430.41470.52000.64280.96361.18801.43882.16483.24724.87081.32E-036.22E-042.47E-048.30E-052.47E-057.03E-061.96E-066.61 E-073.98E-072.44E-078.34E-084.57E-082.55E-086.43E-091.31 E-091.65E-10I I I 4.Pilgrim0.01480.02070.02880.04010.05600.07710.10650.14460.19570.26100.34100.42030.51610.62830.79360.90001.04641.38321.87446.76E-034.63E-033.12E-032.06E-031.34E-038.68E-045.55E-043.52E-042.23E-041.38E-048.57E-055.23E-053.11 E-051.77E-059.51 E-067.08E-064.65E-061.96E-065.99E-070.01780.02660.03920.05840.08700.12940.19220.27900.39650.54430.68640.73011.04491.25601.42061.72282.19002.62404.00001.04E-027.07E-034.70E-033.03E-031.88E-031.14E-036.69E-043.83E-042.15E-041.18E-047.37E-056.26E-053.20E-052.21 E-051.54E-056.74E-062.52E-067.OOE-077.31 E-080.02150.03200.04730.06980.10370.15390.22720.32130.46080.63650.82290.89861.25911.45601.64441.91262.19002.62403.93601.31 E-028.44E-035.30E-033.21 E-031.88E-031.07E-035.92E-043.20E-041.69E-048.74E-055.26E-054.41 E-052.14E-051.44E-059.77E-064.03E-061.44E-064.16E-076.69E-080.00400.00600.00920.01400.02110.03280.04950.07630.11630.17570.27430.41470.52000.64280.96361.18801.43882.16483.24724.87081.16E-027.39E-034.48E-032.57E-031.40E-037.24E-043.58E-041.71E-048.09E-053.81 E-051.79E-058.21 E-065.37E-063.55E-061.41 E-068.42E-075.10E-071.59E-074.28E-088.57E-09I I IRiver Bend0.00560.00780.01100.01540.02150.03010.04220.05904.07E-032.87E-031.91 E-031.17E-036.76E-043.87E-042.22E-041.29E-040.00800.01210.01810.02710.04070.06040.08970.12805.73E-034.05E-032.73E-031.70E-039.82E-045.45E-042.96E-041.56E-040.01380.02060.03040.04500.06380.09460.14010.19207.19E-034.88E-033.22E-031.96E-031.08E-035.52E-042.73E-041.32E-040.01040.01570.02350.03530.05240.07840.11530.16548.20E-035.56E-033.75E-032.47E-031.54E-038.39E-043.88E-041.53E-04Page 5 of 7

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

PGA10 Hz5 Hz1 Hz0.08240.11600.16240.22720.31760.44480.62240.72000.87201.21601.70407.57E-054.44E-052.63E-051.55E-058.99E-064.97E-062.59E-061.90E-061.23E-065.10E-071.55E-070.17660.25920.31980.34990.51920.64000.77841.16801.75202.62404.00008.06E-054.05E-052.37E-051.98E-059.38E-066.33E-064.32E-061.84E-066.76E-071.88E-071.97E-080.25340.31680.37050.39740.52570.64000.77841.16801.75202.62403.93606.26E-052.93E-051.65E-051.35E-056.16E-064.06E-062.72E-061.10E-063.89E-071.12E-071.82E-080.21530.22610.24840.25920.32000.38960.58400.72000.87201.31201.96802.95205.38E-051.82E-056.43E-062.43E-061.53E-069.98E-073.90E-072.31 E-071.39E-074.28E-081.13E-082.21 E-09I I

• 4~Vermont Yankee0.00700.00980.01370.01920.02690.03760.05270.07380.10300.14500.20300.28400.39700.55600.77800.90001.09001.52002.13001.02E-026.67E-034.23E-032.58E-031.53E-038.88E-045.00E-042.77E-041.53E-048.35E-054.67E-052.64E-051.49E-058.15E-064.25E-063.14E-062.04E-068.51 E-072.58E-070.00750.01130.01690.02530.03800.05700.08540.12800.19200.28800.39000.43200.64900.80000.97301.46002.19003.28005.00001.70E-021.11 E-026.94E-034.12E-032.31 E-031.24E-036.34E-043.13E-041.51 E-047.20E-054.13E-053.43E-051.61 E-051.08E-057.30E-063.06E-061.11 E-063.05E-073.15E-080.00750.01130.01690.02530.03800.05700.08540.12800.19200.28800.39000.43200.64900.80000.97301.46002.19003.28004.92002.07E-021.32E-027.99E-034.59E-032.49E-031.28E-036.30E-042.94E-041.32E-045.79E-053.12E-052.53E-051.10E-057.11 E-064.66E-061.83E-066.34E-071.81 E-072.87E-080.00370.00560.00840.01270.01900.02850.04270.06410.09610.14400.21600.32400.40000.48700.73000.90001.09001.64002.46003.69001.51 E-029.73E-035.99E-033.49E-031.93E-039.99E-044.83E-042.16E-049.01 E-053.55E-051.35E-055.11 E-063.06E-061.89E-066.76E-073.88E-072.30E-076.95E-081.83E-083.62E-09Waterford 0.00560.00780.01100.01540.02150.03010.04220.05900.08240.11600.16240.22723.62E-032.48E-031.60E-039.80E-045.92E-043.60E-042.19E-041.33E-048.14E-054.91 E-052.98E-051.79E-050.00600.00900.01350.02020.03040.04560.06830.10240.15360.23040.31200.34565.15E-033.58E-032.34E-031.44E-038.58E-045.00E-042.84E-041.57E-048.34E-054.33E-052.61 E-052.20E-050.01200.01810.02700.03970.05700.08040.11790.15620.18430.23620.31200.34566.35E-034.28E-032.73E-031.61E-038.91 E-044.78E-042.51 E-041.29E-046.42E-053.14E-051.82E-051.51 E-050.00870.01320.01970.02920.04220.06130.08200.11990.16340.18720.17930.25927.46E-035.04E-033.37E-032.17E-031.29E-036.59E-042.90E-041.12E-044.13E-051.56E-056.20E-062.66E-06Page 6 of 7 ONEntergENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Seismic Hazard Curves Used in GI-199Basis: 2008 USGS adjusted for site soil conditions using EPRI/SOG site amplification functions (EPRI NP-6395-D)

PGA 10 Hz 5 Hz 1 Hz0.3176 1.05E-05 0.5192 1.09E-05 0.5192 7.18E-06 0.3200 1.73E-060.4448 5.95E-06 0.6400 7.46E-06 0.6400 4.81E-06 0.3896 1.14E-060.6224 3.18E-06 0.7784 5.17E-06 0.7784 3.25E-06 0.5840 4.49E-070.7200 2.36E-06 1.1680 2.25E-06 1.1680 1.33E-06 0.7200 2.66E-070.8720 1.55E-06 1.7520 8.33E-07 1.7520 4.70E-07 0.8720 1.61 E-071.2160 6.52E-07 2.6240 2.30E-07 2.6240 1.35E-07 1.3120 4.96E-081.7040 1.99E-07 4.0000 2.35E-08 3.9360 2.14E-08 1.9680 1.31 E-08I 1 1 2.9520 2.53E-09Page 7 of 7

!'--Entergy ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Attachment 7SHIP Model Input and Output A 'ENG REPORT PNPS-RPT-1 1-00001z-Enter~gy Re-assessment of Pilgrim Seismic Core Damage Frequency Prepared by: John Favara Reviewed by: Clem YehBackground 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 modelincorporated seismic fragilities for components into event trees and fault trees. These resulted insequences where system-induced failures could lead to core damage. The effect on plant SCDFof changing the fragility of a given component (structure, system or equipment) is determined bychanging 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 PilgrimSCDF based on revised seismic capacity of important seismic components, update of randomfailure data for significant non-seismic components, realistic consideration of operator actionfailure 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 seismichazard 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 stepsusing the seismic component fragilities and SHIP computer code to determine the seismicsequences frequencies and plant fragilities along with the seismic point estimate core damagefirequencies.

The steps were:1. The SPRA logic model was initially quantified, using the current version of SAIC'sCAFTA (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 cutsetswere provided as input to the initial risk quantification over the entire spectrum of theseismic hazard curve. The cutsets were also used to rank important seismic and non-seismic failures for subsequent sensitivity analyses.

The results of the initialquantification, and the importance rankings were used to determine which seismicfailures required more detailed fragility analysis.

These results were also used todetermine the need for more detailed fragility and human reliability analysis2. 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). ThePage 1 of 102

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

3. Quantify the Pilgrim SPRA model using the SHIP software package.

The SHIP programintegrates the SPRA logic model cutsets, the site seismic hazard curve, random failures, operator actions and the individual component seismic fragilities over the full range ofseismic risk. The SHIP quantification results include the estimate of the plant coredamage 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 theEPRI hazard curves and best-estimate seismic fragilities and random failure frequencies.

Thetotal SCDF is the sum of the SCDFs for each sequence.

The contribution of each sequence to theSCDF is equal to its SCDF divided by the total SCDF.Of the 13 seismic-induced accident sequences, the top six dominant accident sequences leadingto core damage shown in the Pilgrim IPEEE contribute almost 98 percent of the total coredamage frequency.

The seismic sequences, ranked according to their contribution to coredamage frequency, are listed below..CDFSequence Contribution Description Rank PercentSITQU 1 46.66 Loss of makeup at high RPV pressureSITW 2 35.92 Loss of containment heat removalSISL2 3 5.25 Small LOCA with high pressure makeup failureSISLi 4 4.88 Small LOCA with containment control failureSURROGATE 5 2.81 Surrogate element to represent all "screened out" components SIVR1 6 2.6 Vessel RuptureSIATWS1 7 1.01 ATWSSIAOUT1 8 0.5 Large LOCA outside containment SISORV2 9 0.13 SORV with successful HP injection but with LP injection failureSISORV1 10 0.1 SORV with successful HP injection but containment control failureSISORV4 11 0.09 SORV with HP and LP injection failureSISORV3 12 0.03 SORV with successful LP injection but containment control failureSIISL1 13 0 Interfacing system LOCAsAlthough, it is not possible, at this time, to change the CAFTA logic model use to generate theseismic sequences cutsets use as inputs to the model. The capability exists to run SHIP andhence, 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 EPRIhazard curves. The revised SPRA model reflect realistic changes in systems, structures, and components seismic capacity, random failure rates, success criteria, and operatorPage 2 of 102

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

This removes some inherent conservatism from the IPEEE SPRA model (forexample low seismic fragilities and outdated plant failure data).2. Predict the change in SCDF based on the original IPEEE SPRA model and use of USGShazard curves. This provides some perspective regarding the potential conservatism inthe NRC's seismic hazard.3. Determine SCDF contribution for seismic components only based on the original IPEEESPRA model and use of USGS hazard curves.4. Predict the change in SCDF based on the revised SPRA model (as described in item #1above) and use of the USGS hazard curves.5. Determine SCDF contribution for seismic only components based on the revised SPRAmodel (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 theupdated EPRI hazard curves. This provides some perspective regarding the impact of theupdated EPRI hazards curves versus the IPEEE EPRI hazard curves and the 2008 USGShazard curves.7. Determine SCDF contribution for seismic only components based on the original IPEEESPRA 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 asabove) and use of the updated EPRI hazard curves.9. Determine SCDF contribution for seismic only components based on the revised SPRAmodel (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 ResultsShip Run EPRI Original Curves (revised model) Seismic and Non-Seismic

1. 1Seismic Core Damage Frequency 2.85E-5/year Median Capacity 0.57gHCLPF 0.33gShip Run 2008 USGS Curves Seismic and Non-Seismic

1. 2Seismic Core Damage Frequency 3.78E-05/year Median Capacity 0.48gHCLPF 0.25gShip Run 2008 USGS Curves Seismic Only#3Seismic Core Damage Frequency 2.33E-05/year Median Capacity 0.56gHCLPF 0.32gShip Run 2008 USGS Curves (revised model) Seismic and Non-Seismic

1. 4Seismic Core Damage Frequency 2.14E-05/year Median Capacity 0.57gHCLPF 0.33gShip Run 2008 USGS Curves (revised model) Seismic Only#5Seismic Core Damage Frequency 1.20E-05/year Median Capacity 0.69gHCLPF 0.38gShip Run Updated EPRI Curves Seismic and Non-Seismic

1. 6Seismic Core Damage Frequency 2.15E-05/year Median Capacity 0.49gHCLPF 0.25gShip Run Updated EPRI Curves Seismic Only#7Seismic Core Damage Frequency 1.56E-05/year Median Capacity 0.57gHCLPF 0.32gPage 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 ResultsShip Run Updated EPRI Curves (revised model) Seismic and Non-Seismic

1. 8Seismic Core Damage Frequency 1.44E-05/year Median Capacity 0.57gHCLPF 0.33gShip Run Undated EPRI Curves (revised model) Seismic Only#9Seismic Core Damage Frequency 8.97E-06/year Median Capacity 0.69gHCLPF 0.38gPage 5 of 102 A EnENG REPORT PNPS-RPT-I 1-00001e-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation

1. 1Predict the change in SCDF based on revised SPRA model and use of the original EPRI hazardcurves. The revised SPRA model reflect realistic changes in systems, structures, andcomponents seismic capacity, random failure rates, success criteria, and operator actions.

Thisremoves some inherent conservatism from the IPEEE SPRA model (for example low seismicfragilities 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 beused by SHIP for Case #1). [see page 22 for details]ii. Basic Input File: PILCDFI .GEN (This file contains basic parameters relevant to theSHIP Case #1 application).

[see page 22 for details]iii. Basic Event Data File: PILCDFI.CMP (This file contains data pertaining to seismicfragilities, random failures, and operator actions for SHIP for Case #1). This filecontains the revise data on plant components seismic fragilities, updated randomfailure rate, less conservative operator actions failure probability to align suppression pool cooling, and current system success criteria on quad rooms cooling.

[see page 23for details]iv. System Data File: PILCDF1.SYS (This file contains a list of systems to be analyzedfor SHIP for Case #1. Note that the cutsets for each system will be read fromseparate files). [see page 29 for details]v. Sequence Data File: PILCDFI .SEQ (This file contains data regarding sequences andplant 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 EPRIseismic 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 beanalyzed for SHIP for Case #1. Note that for Pilgrim SPRA, the CDFALL system isthe 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 forCase #1. This file contains information on names of all input files, information of allinput files, and information on core damage frequency (overall and individual sequences),

plant median capacity, and high confidence of a low probability of failureHCLPF] information).

[See page 30 for details]Page 6 of 102 90EntergENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Results for SHIP Evaluation

1. 1SCDF (using IPEEE EPRI data) = 2.85E-5/year Median Capacity (using IPEEE EPRI data) = 0.57gHCLPF (using IPEEE EPRI data)= 0.33gPage 7 of 102 S.'Entergy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation

1. 2Predict the change in SCDF based on the original IPEEE SPRA model and use of USGS hazardcurves. This provides some perspective regarding the potential conservatism in the NRC'sseismic hazard.List of SHIP input files:i. Names Filet PILUSGS.NAM (This file lists the names of all other data files to beused by SHIP for Case #2). [see page 31 for details]ii. Basic Input File: PILUSGS.GEN (This file contains basic parameters relevant to theSHIP Case #2 application).

[see page 31 for details]iii. Basic Event Data File: PILUSGS.CMP (This file contains data pertaining to seismicfragilities, random failures, and operator actions for SHIP for Case #2). [see page 32for details]iv. System Data File: PILUSGS.SYS (This file contains a list of systems to be analyzedfor SHIP for Case #2. Note that the cutsets for each system will be read fromseparate files) [see page 38 for details]v. Sequence Data File: PILUSGS.SEQ (This file contains data regarding sequences andplant 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 USGSseismic 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 beanalyzed for SHIP for Case #2. Note that for Pilgrim SPRA, the CDFALL system isthe 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 forCase #2. This file contains information on names of all input files, information of allinput files, and information on core damage frequency (overall and individual sequences),

plant median capacity, and high confidence of a low probability of failureHCLPF] information).

[See page 39 for details]Results for SHIP Evaluation

1. 2SCDF (using Updated USGS data) = 3.78E-5/year Median Capacity (using Updated USGS data) = 0.49gHCLPF (using Updated USGS data)= 0.25gPage 8 of 102 S.'Entergy ENG REPORT PN PS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation

1. 3Determine SCDF contribution for seismic only components based on the original IPEEE SPRAmodel 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 beused by SHIP for Case #3). [see page 40 for details]ii. Basic Input File: PILRUN1.GEN (This file contains basic parameters relevant to theSHIP Case #3 application).

[see page 40 for details]iii. Basic Event Data File: PILRUN1I.CMP (This file contains data pertaining to seismicfragilities, random failures, and operator actions for SHIP for Case #3). [see page 41for details]iv. System Data File: PILRUN1.SYS (This file contains a list of systems to be analyzedfor SHIP for Case #3. Note that the cutsets for each system will be read fromseparate files) [see page 47 for details]v. Sequence Data File: PILRUN1.SEQ (This file contains data regarding sequences andplant 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 EPRIseismic 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 beanalyzed for SHIP for Case #3. Note that for Pilgrim SPRA, the CDFALL system isthe 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 forCase #3. This file contains information on names of all input files, information of allinput files, and information on core damage frequency (overall and individual sequences),

plant median capacity, and high confidence of a low probability of failureHCLPF] information).

[See page 48 for details]Results for SHIP Evaluation

1. 3SCDF (using USGS data) = 2.33E-05/year Median Capacity (using USGS data) = 0.56gHCLPF (using USGS data)= 0.32gPage 9 of 102 S.'Entergy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation

1. 4Predict the change in SCDF based on revised SPRA model and use of the 2008 USGS hazardcurves. The revised SPRA model reflect realistic changes in systems, structures, andcomponents seismic capacity, random failure rates, success criteria, and operator actions.

Thisremoves some inherent conservatism from the IPEEE SPRA model (for example low seismicfragilities 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 beused by SHIP for Case #4). [see page 49 for details]ii. Basic Input File: PILCDF2.GEN (This file contains basic parameters relevant to theSHIP Case #4 application).

[see page 49 for details]iii. Basic Event Data File: PILCDF2.CMP (This file contains data pertaining to seismicfragilities, random failures, and operator actions for SHIP for Case #4). This filecontains the revise data on plant components seismic fragilities, updated randomfailure rate, less conservative operator actions failure probability to align suppression pool cooling, and current system success criteria on quad rooms cooling.

[see page 50for details]iv. System Data File: PILCDF2.SYS (This file contains a list of systems to be analyzedfor SHIP for Case #4. Note that the cutsets for each system will be read fromseparate files) [see page 56 for details]v. Sequence Data File: PILCDF2.SEQ (This file contains data regarding sequences andplant 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 EPRIseismic 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 beanalyzed for SHIP for Case #4. Note that for Pilgrim SPRA, the CDFALL system isthe 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 forCase #4. This file contains information on names of all input files, information of allinput files, and information on core damage frequency (overall and individual sequences),

plant median capacity, and high confidence of a low probability of failureHCLPF] information).

[See page 57 for details]Page 10 of 102

!%-Entergy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Results for SHIP Evaluation

1. 4SCDF (using USGS data) = 2.14E-05/year Median Capacity (using USGS data)= 0.57gHCLPF (using USGS data)= 0.33gPage 11 of 102 A E tENG REPORT PNPS-RPT-1 1-00001z-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation

1. 5Determine SCDF contribution for seismic only components based on the revised SPRA modeland 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 operatoractions.

This removes some inherent conservatism from the IPEEE SPRA model (for examplelow 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 beused by SHIP for Case #5). [see page 58 for details]ii. Basic Input File: PILRUN1.GEN (This file contains basic parameters relevant to theSHIP Case #5 application).

[see page 58 for details]iii. Basic Event Data File: PILRUNI.CNP (This file contains data pertaining to seismicfragilities, random failures, and operator actions for SHIP for Case #5). This filecontains the revise data on plant components seismic fragilities, updated randomfailure rate, less conservative operator actions failure probability to align suppression pool cooling, and current system success criteria on quad rooms cooling.

[see page 59for details]iv. System Data File: PILRUN1.SYS (This file contains a list of systems to be analyzedfor SHIP for Case #5. Note that the cutsets for each system will be read fromseparate files) [see page 65 for details]v. Sequence Data File: PILRUN1.SEQ (This file contains data regarding sequences andplant 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 EPRIseismic 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 beanalyzed for SHIP for Case #5. Note that for Pilgrim SPRA, the CDFALL system isthe 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 forCase #5. This file contains information on names of all input files, information of allinput files, and information on core damage frequency (overall and individual sequences),

plant median capacity, and high confidence of a low probability of failureHCLPF] information).

[See page 66 for details]Page 12 of 102 1"Entergy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Results for SHIP Evaluation

1. 5SCDF (using USGS data) = 1.20E-05/year Median Capacity (using USGS data) = 0.69gHCLPF (using USGS data)= 0.38gPage 13 of 102 9% E e ENG REPORT PN PS-RPT-11-00001

~EntergyRe-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation

1. 6Predict the change in SCDF based on the original IPEEE SPRA model and use of the updatedEPRI hazard curves. This provides some perspective regarding the impact of the updated EPRIhazards 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 beused by SHIP for Case #6). [see page 67 for details]ii. Basic Input File: PILEPRI 1.GEN (This file contains basic parameters relevant to theSHIP Case #6 application).

[see page 67 for details]iii. Basic Event Data File: PILEPRI I.CMP (This file contains data pertaining to seismicfragilities, random failures, and operator actions for SHIP for Case #6). This filecontains the revise data on plant components seismic fragilities, updated randomfailure rate, less conservative operator actions failure probability to align suppression pool cooling, and current system success criteria on quad rooms cooling.

[see page 68for details]iv. System Data File: PILEPRII.SYS (This file contains a list of systems to be analyzedfor SHIP for Case #6. Note that the cutsets for each system will be read fromseparate files) [see page 74 for details]v. Sequence Data File: PILRUN1.SEQ (This file contains data regarding sequences andplant 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 EPRIseismic 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 beanalyzed for SHIP for Case #6. Note that for Pilgrim SPRA, the CDFALL system isthe 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 SHIPfor Case #6. This file contains information on names of all input files, information ofall input files, and information on core damage frequency (overall and individual sequences),

plant median capacity, and high confidence of a low probability of failureHCLPF] information).

[See page 75 for details]Page 14 of 102 ct-Entergy ENG REPORT PNPS-RPT-1I

-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Results for SHIP Evaluation

1. 6SCDF (using updated EPRI data) = 2.1 5E-05/year Median Capacity (using updated EPRI data) 0.49gHCLPF (using updated EPRI data) 0.25gPage 15 of 102 AENG REPORT PNPS-RPT-I 1-00001=t-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation

1. 7Determine SCDF contribution for seismic only components based on the original IPEEE SPRAmodel 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 beused by SHIP for Case #7). [see page 76 for details]ii. Basic Input File: PILEPRI2.GEN (This file contains basic parameters relevant to theSHIP Case #7 application).

[see page 76 for details]iii. Basic Event Data File: PILEPRI2.CMP (This file contains data pertaining to seismicfragilities, random failures, and operator actions for SHIP for Case #7). This filecontains the revise data on plant components seismic fragilities, updated randomfailure rate, less conservative operator actions failure probability to align suppression pool cooling, and current system success criteria on quad rooms cooling.

[see page 77for details]iv. System Data File: PILEPRI2.SYS (This file contains a list of systems to be analyzedfor SHIP for Case #7. Note that the cutsets for each system will be read fromseparate files) [see page 83 for details]v. Sequence Data File: PILRUN2.SEQ (This file contains data regarding sequences andplant 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 EPRIseismic 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 beanalyzed for SHIP for Case #7. Note that for Pilgrim SPRA, the CDFALL system isthe 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 SHIPfor Case #7. This file contains information on names of all input files, information ofall input files, and information on core damage frequency (overall and individual sequences),

plant median capacity, and high confidence of a low probability of failureHCLPF] information).

[See page 84 for details]Page 16 of 102 9%Entergy ENG REPORT PNPS-RPT-I 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Results for SHIP Evaluation

1. 7SCDF (using updated EPRI data)= 1.56E-05/year Median Capacity (using updated EPRI data)= 0.57gHCLPF (using updated EPRI data)= 0.32gPage 17 of 102

--'Entey ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation

1. 8Predict the change in SCDF based on the revised SPRA model (as described in item #1 on page 3of 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 beused by SHIP for Case #8). [see page 85 for details]ii. Basic Input File: PILCDF1.GEN (This file contains basic parameters relevant to theSHIP Case #8 application).

[see page 85 for details]iii. Basic Event Data File: PILCDFI.CMP (This file contains data pertaining to seismicfragilities, random failures, and operator actions for SHIP for Case #8). This filecontains the revise data on plant components seismic fragilities, updated randomfailure rate, less conservative operator actions failure probability to align suppression pool cooling, and current system success criteria on quad rooms cooling.

[see page 86for details]iv. System Data File: PILCDF1.SYS (This file contains a list of systems to be analyzedfor SHIP for Case #8. Note that the cutsets for each system will be read fromseparate files) [see page 92 for details]v. Sequence Data File: PILCDFI.SEQ (This file contains data regarding sequences andplant 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 EPRIseismic 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 beanalyzed for SHIP for Case #8. Note that for Pilgrim SPRA, the CDFALL system isthe 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 forCase #8. This file contains information on names of all input files, information of allinput files, and information on core damage frequency (overall and individual sequences),

plant median capacity, and high confidence of a low probability of failureHCLPF] information).

[See page 93 for details]Page 18 of 102

"ýEntergy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Results for SHIP Evaluation

1. 8SCDF (using updated EPPR data) = 1.44E-05/year Median Capacity (using updated EPRI data) = 0.57gHCLPF (using updated EPRI data) = 0.33gPage 19 of 102 S"EntergyENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation

1. 9Determine 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 hazardcurves.List of SHIP input files:i. Names File: PILEPRI I.NAM (This file lists the names of all other data files to beused by SHIP for Case #9). [see page 94 for details]ii. Basic Input File: PILEPRI 1.GEN (This file contains basic parameters relevant to theSHIP Case #9 application).

[see page 94 for details]iii. Basic Event Data File: PILEPRI1.CMP (This file contains data pertaining to seismicfragilities, random failures, and operator actions for SHIP for Case #9). This filecontains the revise data on plant components seismic fragilities, updated randomfailure rate, less conservative operator actions failure probability to align suppression pool cooling, and current system success criteria on quad rooms cooling.

[see page 95for details]iv. System Data File: PILEPRI I.SYS (This file contains a list of systems to be analyzedfor SHIP for Case #9. Note that the cutsets for each system will be read fromseparate files) [see page 101 for details]v. Sequence Data File: PILEPRI 1.SEQ (This file contains data regarding sequences andplant 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 EPRIseismic 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 beanalyzed for SHIP for Case #9. Note that for Pilgrim SPRA, the CDFALL system isthe 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 forCase #9. This file contains information on names of all input files, information of allinput files, and information on core damage frequency (overall and individual sequences),

plant median capacity, and high confidence of a low probability of failureHCLPF] information).

[See page 102 for details]Page 20 of 102

!!-Entergy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Results for SHIP Evaluation

1. 9SCDF (using updated EPRI data) = 8.87E-06/year Median Capacity (using updated EPRI data) = 0.69gHCLPF (using updated EPRI data)= 0.38gPage 21 of 102 cz-Entergy ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency List of SHIP Input FilesSHIP Evaluation

1. 1Names File for PILCDFI.NAM PILCDF 1 .GENPILCDFI .SYSPILCDF1 .CMPPILCDF 1 .SEQPIL.HAZPILCDF1.NAM 05-19-11Basic Input File for PILCDF1.GEN Pilgrim SPRAEntergy NuclearFRAG&BE Data (EPRI)SCDFI1 1 21 1 11 1 11 129 7 122 1 2 1PGA (g)1 .04 .01 0.98 12902PILCDFI .GEN05-19-11nsupcmp,ncomps,ncmpnln,nr,nsys,nseq,ndmg Page 22 of 102 A.' Entergy ENG REPORT PN PS-RPT-I 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Basic Event Data File for PILCDFI.CMP ESISLXXXLXZ SISLEBAAXXXXXZ 2.11 0.46 0 0EBABD3XXXZ 2.28 0.46 0 0EBCDI145XZ 2.11 0.46 0 0EBCD I 2-13Z 2.28 0.46 0 0EBDDGBLDXZ 1.04 0.46 0 0EBSA5XXXXZ 1.76 0.46 0 0EBSA600XXZ 2.09 0.46 0 0EBSA6XXXXZ 2.09 0.46 0 0EBSA8XXXXZ 0.96 0.29 0.37 0EBSB1OXXXZ 2.24 0.46 0 0EBSB 1415XZ 1.51 0.46 0 0EBSB I718XZ 2 0.46 0 0EBSBIXXXXZ 2 0.46 0 0EBSB2XXXXZ 1.13 0.46 0 0EBSB6XXXXZ 2 0.46 0 0EBSD16XXXZ 2.11 0.46 0 0EBSD17XXXZ 2.28 0.46 0 0EBSD4XXXXZ 2.11 0.46 0 0EBSD5XXXXZ 2.28 0.46 0 0EBSD7XXXXZ 2 0.46 0 0EBSY34XXXZ 1.49 0.46 0 0EBW 185/1XZ 1.41 0.46 0 0EBW195/23Z 2 0.46 0 0EBW I98/OXZ 2.29 0.46 0 0EBW198/IXZ 3.43 0.33 0.72 0EBW 198/2XZ 3.43 0.33 0.72 0EBW198/3XZ 2.29 0.46 0 0EBW209/OXZ 2 0.46 0 0EBW209/I XZ 1.72 0.46 0 0EBW210/OXZ 1.65 0.34 0.46 0EBW210/IXZ 1.84 0.46 0 0EBW210/3XZ 2 0.46 0 0EBW45/3XXZ 2 0.46 0 0ECBD29XXXZ 2.23 0.46 0 0ECBD30-31Z 2.28 0.46 0 0ECMK 103ABZ 1.73 0.46 0 0ECONTLRODZ 1.55 0.46 0 0ECOREPLATZ 2.9 0.46 0 0EDLGEABXXZ 1.39 0.32 0.57 0EDLGESBOXZ 2 0.46 0 0EDP2233ABZ 1.49 0.46 0 0EDPC2258XZ 2.13 0.46 0 0EDPC5XXXXZ 2.11 0.46 0 0Page 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 0EDPC93023Z 2.28 0.46 0 0EDPC93912Z 2.28 0.46 0 0EDRYWSUPPZ 2.62 0.46 0 0EDWSHIELDZ 2.04 0.46 0 0EFN201ABXZ 2 0.46 0 0EFN202ABXZ 2 0.46 0 0EFN203ABXZ 2 0.46 0 0EFN204ABXZ 2 0.46 0 0EFN204CDXZ 2 0.46 0 0EFN207A-DZ 2 0.46 0 0EFNDWCOOLZ 1.06 0.46 0 0EFUAXXXXXZ 2.23 0.46 0 0EFUBXXXXXZ 2.5 0.46 0 0EFUD3XXXXZ 2.28 0.46 0 0-EFUELCHANZ 3.96 0.46 0 0EINCORHOUZ 2.75 0.46 0 0EINTKPANLZ 4.54 0.46 0 0EISLOCACSZ 0 0.46 0 0EISLOCRHRZ 0 0.46 0 0ELOCAHPCIZ 2.5 0.46 0 0ELOCARCICZ 2.5 0.46 0 0EPM141ABXZ 1.73 0.46 0 0EPM184AXXZ 1.42 0.46 0 0EPM202A-FZ 2.13 0.46 0 0EPM203A-DZ 2.33 0.46 0 0EPM208A-EZ 2.32 0.46 0 0EPTHPCIXXZ 2.33 0.46 0 0EPTRCICXXZ 2.33 0.46 0 0ERBTRKLOKZ 3.55 0.46 0 0ERE12759!Z 0.89 0.31 0.51 0ERE 12769!Z 1.04 0.31 0.51 0ERE132X9!Z 1.5 0.31 0.51 0ERE1425B!Z 1.14 0.31 0.51 0ERE15159!Z 0.89 0.31 0.51 0ERE15169!Z 1.04 0.31 0.51 0ERE159X9!Z 2.22 0.31 0.51 0ERE 16059!Z 0.89 0.31 0.51 0ERE 16069!Z 1.04 0.31 0.51 0ERE18159!Z 0.89 0.31 0.51 0EREI8169!Z 1.04 0.31 0.51 0ERE1865X!Z 0.73 0.31 0.51 0ERE18681!Z 1.34 0.31 0.51 0ERE18759!Z 0.89 0.31 0.51 0EREI8769!Z 1.04 0.31 0.51 0ERE18781!Z 0.25 0.31 0.51 0ERE2352X!Z 1.2 0.31 0.51 0ERE2759X!Z 1.55 0.31 0.51 0ERE27A5X!Z 0.89 0.31 0.51 0Page 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 0ERE32801!Z 1 0.31 0.51 0ERE40801!Z 0.67 0.31 0.51 0ERE46801!Z 0.67 0.31 0.51 0ERE51N81!Z 1 0.31 0.51 0ERE51NG8!Z 1 0.31 0.51 0ERE51V81!Z 1 0.31 0.51 0ERE59801

!Z 1 0.31 0.51 0ERINGGIRDZ 2.54 0.46 0 0ERPVPEDESZ 3.27 0.46 0 0ERPVSTABLZ 1.52 0.46 0 0ERWCONCWLZ 1.93 0.46 0 0ERXBLDDWLZ 3.57 0.46 0 0ERXBLDFOUZ 1.76 0.46 0 0ESHDSPGUSZ 2.54 0.46 0 0ESURROGATZ 1 0.3 0 0ETBCONCWLZ 3.89 0.46 0 0ETK105ABNZ 5 0.46 0 0ETKT105ABZ 1.27 0.46 0 0ETKT124ABZ 4.81 0.65 0 0ETKT126ABZ 1.44 0.46 0 0ETKT201ABZ 2.1 0.46 0 0ETOPGUIDEZ 2.56 0.46 0 0ETVX21XXXZ 1.76 0.46 0 0ETVX22XXXZ 2.77 0.46 0 0ETVX55XXXZ 1.49 0.46 0 0EUPLOFLORZ 1.4 0.46 0 0EVA452122Z 2.9 0.46 0 0EVESUPSKTZ 6.15 0.46 0 0EVPEABXXXZ 1.73 0.46 0 0EVRCABXXXZ 1.73 0.46 0 0EVS4563ABZ 2.9 0.46 0 0EVS4563CDZ 2.9 0.46 0 0EVS4565CDZ 1.73 0.46 0 0EVS4582ABZ 2.9 0.46 0 0EVS4582CDZ 2.9 0.46 0 0ELOSPXXXXZ 0.35 0.55 0 0EBCDI4XXXY 15 0.0000 0.15 0.4999 0.5 21.0 2.5e-2 2.50E-02 2.50E-01 5.0E-01 5.OOE-01EDLGESBOXY 15 0.0000 0.15 0.4999 0.5 21.0 3.2e-3 3.20E-03 3.20E-02 5.OOE-01 5.OOE-01ELPSPPRPLY 15 0.0000 0.15 0.4999 0.5 21.0 4.0e-3 4.OOE-03 4.OOE-02 1.00E+00 1.00E+00ESPCOOLXXY 15 0.0000 0.15 0.4999 0.5 21.0 5.1e-4 5.10E-04 5.10E-03 5.00E-02 5.OOE-02Page 25 of 102 SEntergyESPC36ABXY 5 0.00001.0 5.0e-IERERESET!Y 5 0.00001.0 9.OE-2EVMMO45X!Y 5 0.00001.0 6.6E-2ACB152501F ACB1 52509LACBI52601F ACB1 52609LACB152802F ACB5605CCN ACB5609CCC ADLADL3CCR ADLADLBCCR ADLADLBCCS ADLBDL3CCR ADLG 123CCRADLGEAXXXS ADLGEAXXXU ADLGEBXXXR ADLGEBXXXU ADLGESBOXS ADLGESBOXU ALOCALOOP APMI41AXXR APM 141BXXRAPM I 84AXXRAPM I 84AXXSAVA452XCCN BPM5XXXCCS BPMBXXXXXU BPMCXXXXXU BPMEXXXXXU BPMFXXXXXU BVM3801XXC BVM3805XXC CMCVC9AXXXXC CVC9BXXXXC DBC21XXCCR DBCDI INOREDBCDI IXXXUDBCD12NORE DBCD12XXXU EBCD IXXXRENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency 10.155.OOE-0110.159.OOE-020.156.60E-021.49E-041.49E-041.49E-04i .49E-041 .49E-042.21 E-058.86E-052.64E-042.64E-044.90E-052.64E-041.32E-054.80E-031.18E-027.92E-031.09E-024.80E-031.42E-021.00E+006.84E-046.84E-046.84E-044.95E-044.OOE-054.80E-051.09E-021.09E-02i .09E-021 .09E-021.65E-031.65E-037.50E-062.66E-042.66E-041.57E-056.80E-017.30E-046.80E-017.30E-042.98E-040.49990.55.OOE-01 7.50E-010.49995.OOE-010.49995.OOE-0 I0.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.55.OOE-010.55.OOE-0127.50E-0125.OOE-0125.OOE-01Page 26 of 102 do EENG REPORT PNPS-RPT-1 1-00001ct-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency EBCDI2XXXR 2.98E-04 0.001ECB152504F 1.49E-04 0.001ECB152505N 1.99E-04 0.001ECB152508L 1.49E-04 0.001ECB 152509C 7.97E-04 0.001ECB I 52600L 1.49E-04 0.001ECB 1 52604F 1.49E-04 0.001ECB I 52605N 1.99E-04 0.001ECB152608L 1.49E-04 0.001ECB 152609C 7.97E-04 0.001ECB 152801C 1.99E-04 0.001ECB1!52802N 1.99E-04 0.001ECB5605AXY 1.00E+00 0.001ECB5605DXY 1.00E+00 0.001EDLGEAXXXR 7.92E-03 0.001EDLGEBXXXS 4.80E-03 0.001EDLGESBOXR 7.92E-03 0.001EHX209AXXU 2.66E-02 0.001EHX209BXXU 2.66E-02 0.001ELOCAHPCIR 1.23E-04 0.001ELOCARCICR 1.23E-04 0.001EPMI41AXXS 4.95E-04 0.001EPMI41BXXS 4.95E-04 0.001EPM208AXXS 9.20E-03 0.001EPM208BXXS 9.20E-03 0.001EPM208EXXS 9.20E-03 0.001EPTHPCIXXR 3.93E-03 0.001EPTRCICXXR 9.78E-03 0.001EVA4521XXN 1.60E-04 0.001EVA4522XXN 1.60E-04 0.001EVMI30117C 1.65E-03 0.001EVM23015XC 1.65E-03 0.001HPMAUXOILS 3.33E-03 0.001HPME205XXS 3.OOE-03 0.001HPTHPCIXXS 3.33E-03 0.001HPTHPRCCCR 2.31E-07 0.001HPTHfPRCCCS 3.46E-05 0.001HSYHPCIMNU 1.21E-02 0.001HVMMO35XXN 1.65E-03 0.001HVMMO36XXN 1.65E-03 0.001HVMMO3XXXN 1.03E-03 0.001HVMMO6XXXC 1.65E-03 0.001HVMMO8XXXN 1.65E-03 0.001ILPRCICMNU 8.74E-03 0.001IPTRCICXXS 3.33E-03 0.001IPVVACPMPS 3.OOE-03 0.001IVMINJVCCN 1.30E-04 0.001IVMMO49XXN 1.50E-03 0.001IVMMO6OXXC 1.65E-03 0.001Page 27 of 102 E tgENG REPORT PN PS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency IVMMO61XXN 1.50E-03 0.001IVMMO62XXN 1.65E-03 0.001P 6.80E-03 0.001R[XE207AXU 5.OOE-04 0.001RH-XE207BXU 5.OOE-04 0.001RLPSPCOLAU 3.OOE-03 0.001RLPSPCOLBU 3.OOE-03 0.001RPMABCDCCS 1.70E-05 0.001RVC68AXXXC 2.66E-04 0.001RVC68BXXXC 2.66E-04 0.00 1RVMIOABCCN 1.30E-04 0.001RVM3436CCN 1.30E-05 0.001RVM34ABCCN 3.70E-05 0.001RVM34AXXXN 1.50E-03 0.001RVM34BXXXN 1.50E-03 0.001RVM36ABCCN 3.70E-05 0.001RVM36AXXXN 1.50E-03 0.001RVM36BXXXN 1.50E-03 0.001RVM4A6BCCN 3.70E-05 0.001RVM4B6ACCN 3.70E-05 0.001RVM60ABCCN 1.30E-04 0.001SPMABXXCCS.

2.60E-04 0.001SPMALLXCCS 1.63E-05 0.001SPMP208BXU 2.98E-02 0.001SPMP208EXU 2.98E-02 0.001SVC3880BXN 1.57E-03 0.001SVC3880EXN 1.57E-03 0.001ETRANSFLAG 1.00E+00 0.001RVM29AXXXL 1.20E-05 0.001RVM29BXXXL 1.20E-05 0.001EVM25BXXXL 1.20E-05 0.001CVM25AXXXL 1.20E-05 0.001JAF-INSERT 4.65E-03 0.001Page 28 of 102

'c-Entergy ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency System Data File for PILCDF1.SYS 1 1 CDFALLLMCDFSeouence Data File: PILCDF1.SEO PIL-SEQI PIL-SEQI11 1ESURROGATZ PIL-SEQ2 F1 1 3\ESURROGATZ

?IL-SEQ2ELOSPXXXXZ CDFALLALLIHazard Data File: PILCDF1.HAZ

• • • • • • • • • Pilgrim Hazard Curves*********

...HAZHEAD (A40)1 ...NHAZ7 ...NPHAZ1.0 ...PWHAZ(I).009174 .09684 .1937 .3914 .5810 .7543 .9888 ACC1.3e-02 1.4e-03 5.3e-04 9.6e-05 2.0e-05 5.7e-06 1.5e-06 HAZPage 29 of 102 "EntergyENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Page 17SCDF1.BAS SHIP Basic OutputNo. Damage State Damage State No-of Contributing Sequence RisksName Risk Sequences (in decreasing order of importance.)

I ALL 2.85E-05 2 No. Sequence Name Sequence Risk %of Total1 PIL-SEQ2 2.57E-05 90.212 PIL-SEQI 2.79E-06 9.79Sum: 2.85E-05 100.00Page 18SCDF 1.BASSHIP Basic OutputSummary of Plant Level Fragility Conditional Probability of FailurePGA (g).050.150.250.500.750.850.950HCLPF (See note)Note: Best Estimate Case HCLPF.401.470.495.572.685.754.889.326HCLPF = Ground motion level for which there is a highconfidence 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 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation

1. 2Names File for PILUSGS.NAM PILUSGS.GEN PILUSGS.SYS PILUSGS.CMP PILUSGS.SEQ PILUSGS.HAZ PILUSGS.NAM 05-18-11Basic Input File for PILUSGS.GEN Pilgrim SPRAEntergy NuclearUSGS Base Case CDFUSGSCDF1 1 21 1 1 11 1 11 129 7 122 1 2 1 nsupcmp,ncomps,ncmpnln,nr,nsys,nseq,ndmg PGA (g)1 .04 .02 0.98 12902PILUSGS.GEN 05-18-11Page 31 of 102 90 EnteW ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Basic Event Data File for PILUSGS.CMP ESISLXXXXZ SISLEBAAXXXXXZ 2.11 0.46 0 0EBABD3XXXZ 2.28 0.46 0 0EBCD1145XZ 2.11 0.46 0 0EBCD12-13Z 2.28 0.46 0 0EBDDGBLDXZ 0.77 0.46 0 0EBSA5XXXXZ 1.76 0.46 0 0EBSA600XXZ 2.09 0.46 0 0EBSA6XXXXZ 2.09 0.46 0 0EBSA8XXXXZ 0.96 0.29 0.37 0EBSB1OXXXZ 2.24 0.46 0 0EBSB1415XZ 1.51 0.46 0 0EBSB 1718XZ 2 0.46 0 0EBSB1XXXXZ 2 0.46 0 0EBSB2XXXXZ 0.84 0.46 0 0EBSB6XXXXZ 2 0.46 0 0EBSDi6XXXZ 2.11 0.46 0 0EBSD17XXXZ 2.28 0.46 0 0EBSD4XXXXZ 2.11 0.46 0 0EBSD5XXXXZ 2.28 0.46 0 0EBSD7XXXXZ 2 0.46 0 0EBSY34XXXZ 1.49 0.46 0 0EBW185/IXZ 1.41 0.46 0 0EBW195/23Z 1 0.46 0 0EBW 198/OXZ 2.29 0.46 0 0EBW 198/1XZ 3.43 0.33 0.72 0EBW198/2XZ 3.43 0.33 0.72 0EBW198/3XZ 2.29 0.46 0 0EBW209/OXZ 0.82 0.46 0 0EBW209/1XZ 1.72 0.46 0 0EBW210/OXZ 1.65 0.34 0.46 0EBW210/IXZ 1.84 0.46 0 0EBW210/3XZ 2 0.46 0 0EBW45/3XXZ 1.07 0.46 0 0ECBD29XXXZ 2.23 0.46 0 0ECBD30-31Z 2.28 0.46 0 0ECMK103ABZ 1.28 0.46 0 0ECONTLRODZ 1.55 0.46 0 0ECOREPLATZ 2.9 0.46 0 0EDLGEABXXZ 1.39 0.32 0.57 0EDLGESBOXZ 2 0.46 0 0EDP2233ABZ 1.49 0.46 0 0EDPC2258XZ 2.13 0.46 0 0EDPC5XXXXZ 2.11 0.46 0 0Page 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 0EDPC93023Z 2.28 0.46 0 0EDPC93912Z 2.28 0.46 0 0EDRYWSUPPZ 2.62 0.46 0 0EDWSHIELDZ 2.04 0.46 0 0EFN201ABXZ 1.23 0.46 0 0EFN202ABXZ 1.23 0.46 0 0EFN203ABXZ 1.23 0.46 0 0EFN204ABXZ 0.61 0.46 0 0EFN204CDXZ 0.61 0.46 0 0EFN207A-DZ 1.01 0.46 0 0EFNDWCOOLZ 1.06 0.46 0 0EFUAXXXXXZ 2.23 0.46 0 0EFUBXXXXXZ 2.5 0.46 0 0EFUD3XXXXZ 2.28 0.46 0 0EFUELCHANZ 3.96 0.46 0 0EINCORHOUZ 2.75 0.46 0 0EINTKPANLZ 4.54 0.46 0 0EISLOCACSZ 0 0.46 0 0EISLOCRHRZ 0 0.46 0 0ELOCAHPCIZ 2.5 0.46 0 0ELOCARCICZ 2.5 0.46 0 0EPM 141ABXZ 1.28 0.46 0 0EPM I84AXXZ 1.05 0.46 0 0EPM202A-FZ 2.13 0.46 0 0EPM203A-DZ 2.33 0.46 0 0EPM208A-EZ 2.32 0.46 0 0EPTHPCIXXZ 2.33 0.46 0 0EPTRCICXXZ 2.33 0.46 0 0ERBTRKLOKZ 3.55 0.46 0 0ERE12759!Z 0.89 0.31 0.51 0ERE12769!Z 1.04 0.31 0.51 0ERE132X9!Z 0.55 0.31 0.51 0EREI425B!Z 1.14 0.31 0.51 0ERE 15159!Z 0.89 0.31 0.51 0ERE 15 169!Z 1.04 0.31 0.51 0ERE159X9!Z 0.55 0.31 0.51 0ERE 16059!Z 0.89 0.31 0.51 0ERE 16069!Z 1.04 0.31 0.51 0EREI8159!Z 0.89 0.31 0.51 0EREI8169!Z 1.04 0.31 0.51 0ERE1865X!Z 0.73 0.31 0.51 0ERE18681!Z 1.34 0.31 0.51 0ERE18759!Z 0.89 0.31 0.51 0ERE18769!Z 1.04 0.31 0.51 0EREI8781!Z 0.25 0.31 0.51 0ERE2352X!Z 1.2 0.31 0.51 0ERE2759X!Z 1.55 0.31 0.51 0ERE27A5X!Z 0.89 0.31 0.51 0Page 33 of 102 a Entergy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency ERE27A6X!Z 1.04 0.31 0.51 0ERE32801

!Z 1 0.31 0.51 0ERE40801!Z 0.67 0.31 0.51 0ERE46801!Z 0.67 0.31 0.51 0ERE5IN8l!Z 1 0.31 0.51 0ERE51NG8!Z 1 0.31 0.51 0ERE51V81!Z 1 0.31 0.51 0ERE59801

!Z 1 0.31 0.51 0ERINGGIRDZ 2.54 0.46 0 0ERPVPEDESZ 3.27 0.46 0 0ERPVSTABLZ 1.52 0.46 0 0ERWCONCWLZ 1.93 0.46 0 0ERXBLDDWLZ 3.57 0.46 0 0ERXBLDFOUZ 1.76 0.46 0 0ESHDSPGUSZ 2.54 0.46 0 0ESURROGATZ 1 0.3 0 0ETBCONCWLZ 3.89 0.46 0 0ETK 105ABNZ 0.16 0.46 0 0ETKT105ABZ 0.94 0.46 0 0ETKT124ABZ 4.81 0.65 0 0ETKT126ABZ 1.44 0.46 0 0ETKT201ABZ 2.1 0.46 0 0ETOPGUIDEZ 2.56 0.46 0 0ETVX21XXXZ 1.76 0.46 0 0ETVX22XXXZ 2.77 0.46 0 0ETVX55XXXZ 1.49 0.46 0 0EUPLOFLORZ 1.4 0.46 0 0EVA452122Z 2.9 0.46 0 0EVESUPSKTZ 6.15 0.46 0 0EVPEABXXXZ 1.28 0.46 0 0EVRCABXXXZ 1.28 0.46 0 0EVS4563ABZ 2.9 0.46 0 0EVS4563CDZ 2.9 0.46 0 0EVS4565CDZ 1.28 0.46 0 0EVS4582ABZ 2.9 0.46 0 0EVS4582CDZ 2.9 0.46 0 0ELOSPXXXXZ 0.35 0.55 0 0EBCD14XXXY 15 0.0000 0.15 0.4999 0.5 21.0 2.5e-2 2.50E-02 2.50E-01 5.OOE-01 5.OOE-01EDLGESBOXY 15 0.0000 0.15 0.4999 0.5 21.0 3.2e-3 3.20E-03 3.20E-02 5.OOE-01 5.OOE-01ELPSPPRPLY 15 0.0000 0.15 0.4999 0.5 21.0 4.0e-3 4.OOE-03 4.OOE-02 1.00E+00 1.00E+00ESPCOOLXXY 15 0.0000 0.15 0.4999 0.5 21.0 5.1e-4 5.1OE-04 5.1OE-03 5.OOE-01 5.OOE-01Page 34 of 102 A n ENG REPORT PNPS-RPT-I 1-00001t-EnteWgRe-assessment of Pilgrim Seismic Core Damage Frequency ESPC36ABXY 15 0.0000 0.15 0.4999 0.5 21.0 5.0e-I 5.OOE-01 5.00E-01 7.50E-01 7.50E-01ERERESET!Y 15 0.0000 0.15 0.4999 0.5 21.0 9.OE-2 9.OOE-02 5.OOE-01 5.OOE-01 5.OOE-01EVMMO45X!Y 15 0.0000 0.15 0.4999 0.5 21.0 6.6E-2 6.60E-02 5.OOE-01 5.OOE-01 5.OOE-01ACB152501F 1.49E-04 0.001ACB152509L 1.49E-04 0.001ACB152601F 1.49E-04 0.001ACB152609L 1.49E-04 0.001ACB152802F 1.49E-04 0.001ACB5605CCN 2.21E-05 0.001ACB5609CCC 8.86E-05 0.001ADLADL3CCR 2.64E-04 0.001ADLADLBCCR 2.64E-04 0.00!ADLADLBCCS 4.90E-05 0.001ADLBDL3CCR 2.64E-04 0.00 1ADLGI23CCR 1.32E-05 0.001ADLGEAXXXS 4.80E-03 0.001ADLGEAXXXU 1.18E-02 0.001ADLGEBXXXR 7.92E-03 0.001ADLGEBXXXU 1.18E-02 0.001ADLGESBOXS 4.80E-03 0.001ADLGESBOXU 1.14E-02 0.001ALOCALOOP 1.00E+00 0.001APMI41AXXR 6.84E-04 0.001APM141BXXR 6.84E-04 0.001APMI84AXXR 6.84E-04 0.001APM184AXXS 4.95E-04 0.001AVA452XCCN 4.OOE-05 0.001BPM5XXXCCS 4.80E-05 0.001BPMBXXXXXU 1.09E-02 0.001BPMCXXXXXU 1.09E-02 0.001BPMEXXXXXU 1.09E-02 0.001BPMFXXXXXU 1.09E-02 0.001BVM3801XXC 1.65E-03 0.001BVM3805XXC 1.65E-03 0.001CM 7.50E-06 0.001CVC9AXXXXC 2.66E-04 0.001CVC9BXXXXC 2.66E-04 0.001DBC21XXCCR 1.57E-05 0.001DBCD IINORE 6.80E-01 0.001DBCDI 1XXXU 7.30E-04 0.001DBCDi2NORE 6.80E-01 0.001DBCD12XXXU 7.30E-04 0.001EBCDIIXXXR 2.98E-04 0.001Page 35 of 102

'Entergy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency EBCDI2XXXR 2.98E-04 0.001ECB152504F 1.49E-04 0.001ECB 152505N 1.99E-04 0.001ECB152508L 1.49E-04 0.001ECB152509C 7.97E-04 0.001ECB152600L 1.49E-04 0.001ECB152604F 1.49E-04 0.001ECB152605N 1.99E-04 0.001ECB152608L 1.49E-04 0.001ECB152609C 7.97E-04 0.001ECB15280!C 1.99E-04 0.001ECB152802N 1.99E-04 0.001ECB5605AXY 1.00E+00 0.001ECB5605DXY 1.00E+00 0.001EDLGEAXXXR 7.92E-03 0.001EDLGEBXXXS 4.80E-03 0.001EDLGESBOXR 7.92E-03 0.001EHX209AXXU 2.66E-02 0.001EHX209BXXU 2.66E-02 0.001ELOCAHPCIR 1.23E-04 0.001ELOCARCICR 1.23E-04 0.001EPM141AXXS 4.95E-04 0.001EPMI41BXXS 4.95E-04 0.001EPM208AXXS 9.20E-03 0.001EPM208BXXS 9.20E-03 0.001EPM208EXXS 9.20E-03 0.001EPTHPCIXXR 1.96E-02 0.001EPTRCICXXR 1.96E-02 0.001EVA4521XXN 1.60E-04 0.001EVA4522XXN 1.60E-04 0.001EVM130117C 1.65E-03 0.001EVM23015XC 1.65E-03 0.001HPMAUXOILS 3.OOE-03 0.001HPME205XXS 3.OOE-03 0.001HPTHPCIXXS 6.11E-03 0.001HPTHPRCCCR 3.56E-04 0.001HPTHPRCCCS 3.90E-04 0.001HSYHPCIMNU 2.54E-02 0.001HVMMO35XXN 1.65E-03 0.001HVMMO36XXN 1.65E-03 0.001 80HVMMO3XXXN 1.30E-02 0.001HVMMO6XXXC 1.65E-03 0.001HVMMO8XXXN 1.65E-03 0.001ILPRCICMNU 3.55E-02 0.001IPTRCICXXS 3.33E-02 0.001IPVVACPMPS 3.OOE-03 0.001IVMINJVCCN 1.30E-04 0.001IVMMO49XXN 1.50E-03 0.001IVMMO6OXXC 1.65E-03 0.001Page 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 0.001IVMMO62XXN 1.65E-03 0.001P 6.80E-03 0.001RHXE207AXU 5.OOE-04 0.001RHXE207BXU 5.OOE-04 0.001RLPSPCOLAU 3.OOE-03 0.001RLPSPCOLBU 3.OOE-03 0.001RPMABCDCCS 1.70E-05 0.001RVC68AXXXC 2.66E-04 0.001RVC68BXXXC 2.66E-04 0.001RVMIOABCCN 1.30E-04 0.001RVM3436CCN 1.30E-05 0.001RVM34ABCCN 3.70E-05 0.001RVM34AXXXN 1.50E-03 0.001RVM34BXXXN 1.50E-03 0.001RVM36ABCCN 3.70E-05 0.001RVM36AXXXN 1.50E-03 0.001RVM36BXXXN 1.50E-03 0.001RVM4A6BCCN 3.70E-05 0.001RVM4B6ACCN 3.70E-05 0.001RVM60ABCCN 1.30E-04 0.001SPMABXXCCS 2.60E-04 0.001SPMALLXCCS 7.OOE-04 0.001SPMP208BXU 2.98E-02 0.001SPMP208EXU 2.98E-02 0.001SVC3880BXN 1.57E-03 0.001SVC3880EXN 1.57E-03 0.001ETRANSFLAG 1.00E+00 0.001RVM29AXXXL 1.20E-05 0.001RVM29BXXXL 1.20E-05 0.001EVM25BXXXL 1.20E-05 0.001CVM25AXXXL 1.20E-05 0.001JAF-INSERT 4.65E-03 0.001PILRUNI .CMP5/18/2011 Page 37 of 102 mf!'-Entergy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency System Data File for PILUSGS.SYS 1 1 CDFALLLMCDFSequence Data File: PILUSGS.SEO PIL-SEQI PIL-SEQI1 11ESURROGATZ PIL-SEQ2 T1 1 3\ESURROGATZ

?IL-SEQ2ELOSPXXXXZ CDFALLALLIHazard Data File: PILTJSGS.HAZ

• Pilgrimn 2008 USGS Hazard Curves*15...HAZHEAD (A40)... NHAZ... NPHAZ...PWHAZ(I)1.00.0148 0.02880.0401 0.0771 0.1065 0.19570.26100.3410 0.5161 0.6283 0.7936 0.9000 1.0464 1.38321.87446.76E-03 3.12E-03 2.06E-03 8.68E-04 5.55E-04 2.23E-04 1.38E-048.57E-05 3.11E-05 1.77E-05 9.51E-06 7.08E-06 4.65E-06 1.96E-065.99E-07Page 38 of 102 ftEnt&VgENG REPORT PN PS-RPT-I 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Page 17USGSCDF.BAS SHIP Basic OutputNo. Damage State Damage State No. of Contributing Sequence RisksName Risk Sequences (in decreasing order of importance) 1 ALL 3.78E-05 2 No. Sequence Name Sequence Risk % of TotalI PIL-SEQ2 3.50E-05 92.442 PIL-SEQI 2.86E-06 7.56Sum: 3.78E-05 100.00Page 18USGSCDF.BAS SHIP Basic OutputSummary of Plant Level Fragility Conditional Probability of Failure.050.150.250.500.750.850.950HCLPF (See note)PGA (g).314.378.418.490.543.630.808.252Note: Best Estimate Case HCLPFHCLPF = Ground motion level for which there is a highconfidence 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 t-Entergy ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation

1. 3Names File for PILRUNI.NAM PILRUN 1 .GENPILRUNI .SYSPILRUN 1 .CMPPILRUN1.SEQ USGS.HAZPILRUN 1 .NAM05-09-94Basic Inout File for PILRUNI.GEN Pilgrim SPRABoston Edison CompanyLevel I PRARANOPO1 1 21 129 7 121 1 2PGA (g)1 .04 .02 0.98 12902nsupcmp,ncomps,ncmpnln, nr, nsys, nseq,ndmg Page 40 of 102 fib ENG REPORT PNPS-RPT-1 1-00001t-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency Basic Event Data File for PILRUN1.CMP ESISLXXXXZ SISLEBAAXXXXXZ 2.11 0.46 0 0EBABD3XXXZ 2.28 0.46 0 0EBCDI145XZ 2.11 0.46 0 0EBCD12-13Z 2.28 0.46 0 0EBDDGBLDXZ 0.77 0.46 0 0EBSA5XXXXZ 1.76 0.46 0 0EBSA600XXZ 2.09 0.46 0 0EBSA6XXXXZ 2.09 0.46 0 0EBSA8XXXXZ 0.96 0.29 0.37 0EBSBIOXXXZ 2.24 0.46 0 0EBSBI415XZ 1.51 0.46 0 0EBSBI718XZ 2 0.46 0 0EBSBIXXXXZ 2 0.46 0 0EBSB2XXXXZ 0.84 0.46 0 0EBSB6XXXXZ 2 0.46 0 0EBSD16XXXZ 2.11 0.46 0 0EBSD17XXXZ 2.28 0.46 0 0EBSD4XXXXZ 2.11 0.46 0 0EBSD5XXXXZ 2.28 0.46 0 0EBSD7XXXXZ 2 0.46 0 0EBSY34XXXZ 1.49 0.46 0 0EBWI85/1XZ 1.41 0.46 0 0EBW195/23Z 1 0.46 0 0EBW198/OXZ 2.29 0.46 0 0EBW198/IXZ 3.43 0.33 0.72 0EBW 198/2XZ 3.43 0.33 0.72 0EBW198/3XZ 2.29 0.46 0 0EBW209/OXZ 0.82 0.46 0 0EBW209/IXZ 1.72 0.46 0 0EBW210/OXZ 1.65 0.34 0.46 0EBW210/1XZ 1.84 0.46 0 0EBW210/3XZ 2 0.46 0 0EBW45/3XXZ 1.07 0.46 0 0ECBD29XXXZ 2.23 0.46 0 0ECBD30-31Z 2.28 0.46 0 0ECMKI03ABZ 1.28 0.46 0 0ECONTLRODZ 1.55 0.46 0 0ECOREPLATZ 2.9 0.46 0 0EDLGEABXXZ 1.39 0.32 0.57 0EDLGESBOXZ 2 0.46 0 0EDP2233ABZ 1.49 0.46 0 0EDPC2258XZ 2.13 0.46 0 0EDPC5XXXXZ 2.11 0.46 0 0Page 41 of 102 A nENG REPORT PNPS-RPT-1 1-00001e-EnteWgRe-assessment of Pilgrim Seismic Core Damage Frequency EDPC6XXXXZ 2.11 0.46 0 0EDPC93023Z 2.28 0.46 0 0EDPC93912Z 2.28 0.46 0 0EDRYWSUPPZ 2.62 0.46 0 0EDWSHIELDZ 2.04 0.46 0 0EFN201ABXZ 1.23 0.46 0 0EFN202ABXZ 1.23 0.46 0 0EFN203ABXZ 1.23 0.46 0 0EFN204ABXZ 0.61 0.46 0 0EFN204CDXZ 0.61 0.46 0 0EFN207A-DZ 1.01 0.46 0 0EFNDWCOOLZ 1.06 0.46 0 0EFUAXXXXXZ 2.23 0.46 0 0EFUBXXXXXZ 2.5 0.46 0 0EFUD3XXXXZ 2.28 0.46 0 0EFUELCHANZ 3.96 0.46 0 0EINCORHOUZ 2.75 0.46 0 0EINTKPANLZ 4.54 0.46 0 0EISLOCACSZ 0 0.46 0 0EISLOCRHRZ 0 0.46 0 0ELOCAHPCIZ 2.5 0.46 0 0ELOCARCICZ 2.5 0.46 0 0EPMI41ABXZ 1.28 0.46 0 0EPM 184AXXZ 1.05 0.46 0 0EPM202A-FZ 2.13 0.46 0 0EPM203A-DZ 2.33 0.46 0 0EPM208A-EZ 2.32 0.46 0 0EPTHPCIXXZ 2.33 0.46 0 0EPTRCICXXZ 2.33 0.46 0 0ERBTRKLOKZ 3.55 0.46 0 0ERE12759!Z 0.89 0.31 0.51 0ERE12769!Z 1.04 0.31 0.51 0EREI32X9!Z 0.55 0.31 0.51 0EREI425B!Z 1.14 0.31 0.51 0ERE15159!Z 0.89 0.31 0.51 0ERE15169!Z 1.04 0.31 0.51 0EREI59X9!Z 0.55 0.31 0.51 0ERE16059!Z 0.89 0.31 0.51 0ERE16069!Z 1.04 0.31 0.51 0ERE18159!Z 0.89 0.31 0.51 0ERE18169!Z 1.04 0.31 0.51 0EREI865X!Z 0.73 0.31 0.51 0ERE18681!Z 1.34 0.31 0.51 0ERE18759!Z 0.89 0.31 0.51 0ERE18769!Z 1.04 0.31 0.51 0ERE18781!Z 0.25 0.31 0.51 0ERE2352X!Z 1.2 0.31 0.51 0ERE2759X!Z 1.55 0.31 0.51 0ERE27A5X!Z 0.89 0.31 0.51 0Page 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 0ERE32801!Z 1 0.31 0.51 0ERE40801!Z 0.67 0.31 0.51 0ERE46801!Z 0.67 0.31 0.51 0ERE51N81!Z 1 0.31 0.51 0ERE51NG8!Z 1 0.31 0.51 0ERE5INV8!Z 1 0.31 0.51 0ERE59801!Z 1 0.31 0.51 0ERINGGIRDZ 2.54 0.46 0 0ERPVPEDESZ 3.27 0.46 0 0ERPVSTABLZ 1.52 0.46 0 0ERWCONCWLZ 1.93 0.46 0 0ERXBLDDWLZ 3.57 0.46 0 0ERXBLDFOUZ 1.76 0.46 0 0ESHDSPGUSZ 2.54 0.46 0 0ESURROGATZ 1 0.3 0 0ETBCONCWLZ 3.89 0.46 0 0ETK105ABNZ 0.16 0.46 0 0ETKT105ABZ 0.94 0.46 0 0ETKT124ABZ 4.81 0.65 0 0ETKT126ABZ 1.44 0.46 0 0ETKT201ABZ 2.1. 0.46 0 0ETOPGUIDEZ 2.56 0.46 0 0ETVX21XXXZ 1.76 0.46 0 0ETVX22XXXZ 2.77 0.46 0 0ETVX55XXXZ 1.49 0.46 0 0EUPLOFLORZ 1.4 0.46 0 0EVA452122Z 2.9 0.46 0 0EVESUPSKTZ 6.15 0.46 0 0EVPEABXXXZ 1.28 0.46 0 0EVRCABXXXZ 1.28 0.46 0 0EVS4563ABZ 2.9 0.46 0 0EVS4563CDZ 2.9 0.46 0 0EVS4565CDZ 1.28 0.46 0 0EVS4582ABZ 2.9 0.46 0 0EVS4582CDZ 2.9 0.46 0 0ELOSPXXXXZ 0.35 0.55 0 0EBCD 14XXXY 12 0.0000 21.0 0.0000 0.OOE+00EDLGESBOXY 12 0.0000 21.0 0.0000 0.OOE+00ELPSPPRPLY 12 0.0000 21.0 0.0000 0.OOE+00ESPCOOLXXY 12 0.0000 21.0 0.0000 0.OOE+00Page 43 of 102 S Entergy ENG REPORT PNPS-RPT-I 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency ESPC36ABXY 12 0.0000 21.0 0.0000 O.OOE+00ERERESET!Y 12 0.0000 21.0 0.0000 0.OOE+00EVMMO45X!Y 12 0.0000 21.0 0.0000 0.OOE+00ACBI5250IF 0.OOE+00 0.001ACBI52509L 0.OOE+00 0.001ACBI52601F 0.OOE+00 0.001ACB152609L 0.OOE+00 0.001ACB152802F 0.OOE+00 0.001ACB5605CCN 0.OOE+00 0.001ACB5609CCC 0.OOE+00 0.001ADLADL3CCR 0.OOE+00 0.001ADLADLBCCR 0.OOE+00 0.001ADLADLBCCS 0.OOE+00 0.001ADLBDL3CCR 0.OOE+00 0.001ADLGI23CCR 0.OOE+00 0.001ADLGEAXXXS 0.OOE+00 0.001ADLGEAXXXU 0.OOE+00 0.001ADLGEBXXXR 0.OOE+00 0.001ADLGEBXXXU 0.OOE+00 0.001ADLGESBOXS 0.OOE+00 0.001ADLGESBOXU 0.OOE+00 0.001ALOCALOOP 0.OOE+00 0.001APM141AXXR 0.OOE+00 0.001APM141BXXR 0.OOE+00 0.001APM 184AXXR 0.OOE+00 0.001APMI84AXXS 0.OOE+00 0.001AVA452XCCN 0.OOE+00 0.001BPM5XXXCCS 0.OOE+00 0.001BPMBXXXXXU 0.OOE+00 0.001BPMCXXXXXU 0.OOE+00 0.001BPMEXXXXXU 0.OOE+00 0.001BPMFXXXXXU 0.OOE+00 0.001BVM3801XXC 0.OOE+00 0.001BVM3805XXC 0.OOE+00 0.001CM 0.OOE+00 0.001CVC9AXXXXC 0.OOE+00 0.001CVC9BXXXXC 0.OOE+00 0.001DBC21XXCCR 0.OOE+00 0.001DBCDIINORE 0.OOE+00 0.001DBCDI 1XXXU 0.OOE+00 0.001DBCD12NORE 0.OOE+00 0.001DBCD12XXXU 0.OOE+00 0.001EBCDI1XXXR 0.OOE+00 0.001Page 44 of 102 A n ENG REPORT PNPS-RPT-1 1-00001c,-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency EBCD12XXXR 0.OOE+00 0.001ECB152504F 0.00E+00 0.001ECB152505N 0.00E+00 0.001ECB152508L 0.OOE+00 0.001ECB152509C 0.OOE+00 0.001ECB 152600L 0.OOE+00 0.001ECB152604F 0.OOE+00 0.001ECB 152605N 0.OOE+00 0.001ECB 152608L 0.OOE+00 0.001ECB 152609C 0.OOE+00 0.001ECB152801C 0.OOE+00 0.001ECB 152802N 0.OOE+00 0.001ECB5605AXY 0.OOE+00 0.001ECB5605DXY 0.OOE+00 0.001EDLGEAXXXR 0.OOE+00 0.001EDLGEBXXXS 0.OOE+00 0.001EDLGESBOXR 0.OOE+00 0.001EHX209AXXU 0.OOE+00 0.001EHX209BXXU 0.OOE+00 0.001ELOCAHPCIR 0.OOE+00 0.001ELOCARCICR 0.OOE+00 0.001EPMI41AXXS 0.OOE+00 0.001EPMI41BXXS 0.OOE+00 0.001EPM208AXXS 0.OOE+00 0.001EPM208BXXS 0.OOE+00 0.001EPM208EXXS 0.OOE+00 0.001EPTHPCIXXR 0.OOE+00 0.001EPTRCICXXR 0.OOE+00 0.001EVA4521XXN 0.OOE+00 0.001EVA4522XXN 0.OOE+00 0.00 1EVMI30117C 0.OOE+00 0.001EVM23015XC 0.OOE+00 0.001HPMAUXOILS 0.OOE+00 0.001HPME205XXS 0.OOE+00 0.001HPTHPCIXXS 0.OOE+00 0.001HPTHPRCCCR 0.OOE+00 0.001HPTHPRCCCS 0.OOE+00 0.001HSYHPCIMNU 0.OOE+00 0.001HVMMO35XXN 0.OOE+00 0.001HVMMO36XXN 0.OOE+00 0.001HVMMO3XXXN 0.OOE+00 0.001HVMMO6XXXC 0.OOE+00 0.001HVMMO8XXXN 0.OOE+00 0.001ILPRCICMNU 0.OOE+00 0.001IPTRCICXXS 0.OOE+00 0.001IPVVACPMPS 0.OOE+00 0.001IVMINJVCCN 0.OOE+00 0.001IVMMO49XXN 0.OOE+00 0.00 iIVMMO6OXXC 0.OOE+00 0.00 1Page 45 of 102 A ENG REPORT PNPS-RPT-1 1-00001c-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency IVMMO61XXN 0.00E+00 0.001IVMMO62XXN 0.OOE+00 0.001P 0.OOE+00 0.001RHXE207AXU 0.OOE+00 0.001RHXE207BXU 0.OOE+00 0.001RLPSPCOLAU 0.OOE+00 0.001RLPSPCOLBU 0.OOE+00 0.001RPMABCDCCS 0.OOE+00 0.001RVC68AXXXC 0.OOE+00 0.001RVC68BXXXC 0.OOE+00 0.001RVM 1OABCCN 0.OOE+00 0.001RVM3436CCN 0.OOE+00 0.001RVM34ABCCN 0.OOE+00 0.001RVM34AXXXN 0.OOE+00 0.001RVM34BXXXN 0.OOE+00 0.001RVM36ABCCN 0.OOE+00 0.001RVM36AXXXN 0.OOE+00 0.001RVM36BXXXN 0.OOE+00 0.00 1RVM4A6BCCN 0.OOE+00 0.001RVM4B6ACCN 0.OOE+00 0.001RVM60ABCCN 0.OOE+00 0.00 1SPMABXXCCS 0.OOE+00 0.001SPMALLXCCS 0.OOE+00 0.001SPMP208BXU 0.OOE+00 0.001SPMP208EXU 0.OOE+00 0.001SVC3880BXN 0.OOE+00 0.001SVC3880EXN 0.OOE+00 0.001ETRANSFLAG 1.00E+00 0.001RVM29AXXXL 0.OOE+00 0.001RVM29BXXXL 0.OOE+00 0.001EVM25BXXXL 0.OOE+00 0.001CVM25AXXXL 0.OOE+00 0.001Page 46 of 102 c-Ent&WgENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency System Data File for PILRUNI .SYS1 1 CDFALLLMCDFSequence Data File: PILRUN1.SEQ PIL-SEQI PIL-SEQI11 1ESURROGATZ PIL-SEQ2 I1 1 3\ESURROGATZ PIL-SEQ2ELOSPXXXXZ CDFALLALLIHazard Data File: USGS.HAZ*Pilgrim 2008 USGS Hazard Curves*115...HAZHEAD (A40)...NHAZ...NPHAZ1.0 ...PWM0.0148 0.0288 0.0401 0.0771 0.1065 0.1957 0.26100.3410 0.5161 0.6283 0.7936 0.9000 1.0464 1.38321.87446.76E-03 3.12E-03 2.06E-03 8.68E-04 5.55E-04 2.23E-04 1.38E-048.57E-05 3.11E-05 1.77E-05 9.51E-06 7.08E-06 4.65E-06 1.96E-065.99E-07-AZ(I)Page 47 of 102 doEntergy ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Page 17RANOPO.BAS SHIP Basic OutputNo. Damage State Damage State No. of Contributing Sequence RisksName Risk Sequences (in decreasing order of importance)

I ALL 2.33E-05 2 No. Sequence Name Sequence Risk % of TotalI PIL-SEQ2 2.05E-05 87.732 PIL-SEQI 2.86E-06 12.27Sum: 2.33E-05 100.00Page 18RANOPO.BAS SHIP Basic OutputSummary of Plant Level Fragility Conditional Probability of FailurePGA (g).050.150.250.500.750.850.950HCLPF (See note)Note: Best Estimate Case HCLPF.383.444.484.564.657.714.836.321HCLPF = Ground motion level for which there is a highconfidence 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

,.EntergENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation

1. 4Names File for PILCDF2.NAM PILCDF2.GEN PILCDF2.SYS PILCDF2.CMP PILCDF2.SEQ USGS.HAZPILCDF2.NAM 05-19-11Basic Input File for PILCDF2.GEN Pilgrim SPRAEntergy NuclearFRAG&BE Data (USGS)SCDF21 1 21 1 11 129 7 122 1 2 1PGA (g)1 .04 .02 0.98 12902PILCDF2.GEN 05-19-11nsupcmp,ncomps,ncmpnln,nr,nsys,nseq,ndmg 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 SISLEBAAXXXXXZ 2.11 0.46 0 0EBABD3XXXZ 2.28 0.46 0 0EBCD1145XZ 2.11 0.46 0 0EBCD12-13Z 2.28 0.46 0 0EBDDGBLDXZ 1.04 0.46 0 0EBSA5XXXXZ 1.76 0.46 0 0EBSA600XXZ 2.09 0.46 0 0EBSA6XXXXZ 2.09 0.46 0 0EBSA8XXXXZ 0.96 0.29 0.37 0EBSBIOXXXZ 2.24 0.46 0 0EBSB1415XZ 1.51 0.46 0 0EBSBI178XZ 2 0.46 0 0EBSBIXXXXZ 2 0.46 0 0EBSB2XXXXZ 1.13 0.46 0 0EBSB6XXXXZ 2 0.46 0 0EBSD16XXXZ 2.11 0.46 0 0EBSD17XXXZ 2.28 0.46 0 0EBSD4XXXXZ 2.11 0.46 0 0EBSD5XXXXZ 2.28 0.46 0 0EBSD7XXXXZ 2 0.46 0 0EBSY34XXXZ 1.49 0.46 0 0EBW 185/IXZ 1.41 0.46 0 0EBW195/23Z 2 0.46 0 0EBW198/OXZ 2.29 0.46 0 0EBW198/1XZ 3.43 0.33 0.72 0EBW198/2XZ 3.43 0.33 0.72 0EBW198/3XZ 2.29 0.46 0 0EBW209/OXZ 2 0.46 0 0EBW209/1 XZ 1.72 0.46 0 0EBW210/OXZ 1.65 0.34 0.46 0EBW210/1XZ 1.84 0.46 0 0EBW210/3XZ 2 0.46 0 0EBW45/3XXZ 2 0.46 0 0ECBD29XXXZ 2.23 0.46 0 0ECBD30-3IZ 2.28 0.46 0 0ECMK I03ABZ 1.73 0.46 0 0ECONTLRODZ 1.55 0.46 0 0ECOREPLATZ 2.9 0.46 0 0EDLGEABXXZ 1.39 0.32 0.57 0EDLGESBOXZ 2 0.46 0 0EDP2233ABZ 1.49 0.46 0 0EDPC2258XZ 2.13 0.46 0 0EDPC5XXXXZ 2.11 0.46 0 0EDPC6XXXXZ 2.11 0.46 0 0EDPC93023Z 2.28 0.46 0 0Page 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 0EDRYWSUPPZ 2.62 0.46 0 0EDWSMIELDZ 2.04 0.46 0 0EFN201ABXZ 2 0.46 0 0EFN202ABXZ 2 0.46 0 0EFN203ABXZ 2 0.46 0 0EFN204ABXZ 2 0.46 0 0EFN204CDXZ 2 0.46 0 0EFN207A-DZ 2 0.46 0 0EFNDWCOOLZ 1.06 0.46 0 0EFUAXXXXXZ 2.23 0.46 0 0EFUBXXXXXZ 2.5 0.46 0 0EFUD3XXXXZ 2.28 0.46 0 0EFUELCHANZ 3.96 0.46 0 0EINCORHOUZ 2.75 0.46 0 0EINTKPANLZ 4.54 0.46 0 0EISLOCACSZ 0 0.46 0 0EISLOCRHRZ 0 0.46 0 0ELOCAHPCIZ 2.5 0.46 0 0ELOCARCICZ 2.5 0.46 0 0EPM 141 ABXZ 1.73 0.46 0 0EPM184AXXZ 1.42 0.46 0 0EPM202A-FZ 2.13 0.46 0 0EPM203A-DZ 2.33 0.46 0 0EPM208A-EZ 2.32 0.46 0 0EPTHPCIXXZ 2.33 0.46 0 0EPTRCICXXZ 2.33 0.46 0 0ERBTRKLOKZ 3.55 0.46 0 0ERE12759!Z 0.89 0.31 0.51 0ERE12769!Z 1.04 0.31 0.51 0ERE!32X9!Z 1.5 0.31 0.51 0EREI425B!Z 1.14 0.31 0.51 0EREI5159!Z 0.89 0.31 0.51 0EREi5i69!Z 1.04 0.31 0.51 0ERE159X9!Z 2.22 0.31 0.51 0ERE16059!Z 0.89 0.31 0.51 0ERE16069!Z 1.04 0.31 0.51 0ERE18159!Z 0.89 0.31 0.51 0ERE18169!Z 1.04 0.31 0.51 0ERE1865X!Z 0.73 0.31 0.51 0EREI8681!Z 1.34 0.31 0.51 0ERE18759!Z 0.89 0.31 0.51 0ERE18769!Z 1.04 0.31 0.51 0ERE18781!Z 0.25 0.31 0.51 0ERE2352X!Z 1.2 0.31 0.51 0ERE2759X!Z 1.55 0.31 0.51 0ERE27A5X!Z 0.89 0.31 0.51 0ERE27A6X!Z 1.04 0.31 0.51 0ERE32801!Z 1 0.31 0.51 0Page 51 of 102

!EntergyERE40801

!ZERE46801

!ZERE51N81!Z ERE5 1NG8!ZERE51V81

!ZERE5980 !!ZERINGGIRDZ ERPVPEDESZ ERPVSTABLZ ERWCONCWLZ ERXBLDDWLZ ERXBLDFOUZ ESHDSPGUSZ ESURROGATZ ETBCONCWLZ ETKI05ABNZ ETKT105ABZ ETKT 124ABZETKT126ABZ ETKT201ABZ ETOPGUIDEZ ETVX21IXXXZ ETVX22XXXZ ETVX55XXXZ EUPLOFLORZ EVA452122Z EVESUPSKTZ EVPEABXXXZ EVRCABXXXZ EVS4563ABZ EVS4563CDZ EVS4565CDZ EVS4582ABZ EVS4582CDZ ELOSPXXXXZ EBCD14XXXY 5 0.00001.0 2.5e-2EDLGESBOXY 5 0.00001.0 3.2e-3ELPSPPRPLY 5 0.00001.0 4.0e-3ESPCOOLXXY 5 0.00001.0 5.Ie-4ESPC36ABXY 5 0.0000ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency 0.670.6711112.543.271.521.933.571.762.5413.8951.274.811.442.12.561.762.771.491.42.96.151.731.732.92.91.732.92.90.3510.152.50E-0210.153.20E-0310.154.OOE-0310.155. i OE-0410.150.310.310.310.310.310.310.460.460.460.460.460.460.460.30.460.460.460.650.460.460.460.460.460.460.460.460.460.460.460.460.460.460.460.460.550.49992.50E-0 10.49993.20E-020.49994.OOE-020.49995.1OE-030.49990.510.510.510.510.510.51000000000000000000000000000000.55.OOE-010.55.OOE-0 I0000000000000000000000000000000000025.OOE-0125.OOE-010.5 21.00E+00 1.00E+000.5 25.OOE-02 5.OOE-020.52Page 52 of 102 SEntergy1.0 5.0e- 1ERERESET!Y 5 0.00001.0 9.OE-2EVMMO45X!Y 5 0.00001.0 6.6E-2ACB152501F ACB152509L ACB152601F ACB152609L ACB152802F ACB5605CCN ACB5609CCC ADLADL3CCR ADLADLBCCR ADLADLBCCS ADLBDL3CCR ADLG 123CCRADLGEAXXXS ADLGEAXXXU ADLGEBXXXR ADLGEBXXXU ADLGESBOXS ADLGESBOXU ALOCALOOP APM141AXXR APMI41BXXR APM I84AXXRAPM 184AXXSAVA452XCCN BPM5XXXCCS BPMBXXXXX UBPMCXXXXXU BPMEXXXXXU BPMFXXXXXU BVM380 1XXCBVM3805XXC CMCVC9AXXXXC CVC9BXXXXC DBC2IXXCCR DBCDI INOREDBCDI IXXXUDBCD I 2NOREDBCD 12XXXUEBCDI IXXXREBCD12XXXR ECB152504F ENG REPORT PN PS-RPT-1

!-00001Re-assessment of Pilgrim Seismic Core Damage Frequency 5.OOE-010.159.OOE-020.156.60E-021.49E-041.49E-041 .49E-041.49E-041.49E-042.2 iE-058.86E-052.64E-042.64E-044.90E-052.64E-041.32E-054.80E-031. 18E-027.92E-031.09E-024.80E-031.42E-021.00E+006.84E-046.84E-046.84E-044.95E-044.OOE-054.80E-051.09E-021.09E-021.09E-021.09E-021.65E-031.65E-037.50E-062.66E-042.66E-041.57E-056.80E-017.30E-046.80E-017.30E-042.98E-042.98E-041.49E-045.OOE-01 7.50E-01 7.50E-010.4999 0.5 25.OOE-01 5.OOE-01 5.OOE-010.4999 0.5 25.O0E-01 5.OOE-01 5.OOE-010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.001Page 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 0.001ECB152508L 1.49E-04 0.001ECB 152509C 7.97E-04 0.001ECB 152600L 1.49E-04 0.001ECB152604F 1.49E-04 0.001ECB152605N 1.99E-04 0.001ECB152608L 1.49E-04 0.001ECB152609C 7.97E-04 0.001ECB152801C 1.99E-04 0.001ECB152802N 1.99E-04 0.001ECB5605AXY 1.00E+00 0.001ECB5605DXY 1.00E+00 0.001EDLGEAXXXR 7.92E-03 0.001EDLGEBXXXS 4.80E-03 0.001EDLGESBOXR 7.92E-03 0.001EHX209AXXU 2.66E-02 0.001EHX209BXXU 2.66E-02 0.001ELOCAHPCIR 1.23E-04 0.001ELOCARCICR 1.23E-04 0.001EPM141AXXS 4.95E-04 0.001EPM141BXXS 4.95E-04 0.001EPM208AXXS 9.20E-03 0.001EPM208BXXS 9.20E-03 0.001EPM208EXXS 9.20E-03 0.001EPTHPCIXXR 3.93E-03 0.001EPTRCICXXR 9.78E-03 0.001EVA4521XXN 1.60E-04 0.001EVA4522XXN 1.60E-04 0.001EVM130117C 1.65E-03 0.001EVM23015XC 1.65E-03 0.001HPMAUXOILS 3.33E-03 0.001HPME205XXS 3.OOE-03 0.0011-PTHPCIXXS 3.33E-03 0.001HPTHPRCCCR 2.31E-07 0.001HPTHPRCCCS 3.46E-05 0.001HSYHPCIMNU 1.21E-02 0.001HVMMO35XXN 1.65E-03 0.001HVMMO36XXN 1.65E-03 0.001HVMMO3XXXN 1.03E-03 0.001HVMMO6XXXC 1.65E-03 0.001HVMMO8XXXN 1.65E-03 0.001ILPRCICMNU 8.74E-03 0.001IPTRCICXXS 3.33E-03 0.001IPVVACPMPS 3.OOE-03 0.001IVMINJVCCN 1.30E-04 0.001IVMMO49XXN 1.50E-03 0.001IVMMO6OXXC 1.65E-03 0.001IVMMO61XXN 1.50E-03 0.001IVMMO62XXN 1.65E-03 0.001Page 54 of 102 is E trENG REPORT PNPS-RPT-1 -00001tý-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency P 6.80E-03 0.001RHXE207AXU 5.OOE-04 0.001RHXE207BXU 5.OOE-04 0.001RLPSPCOLAU 3.OOE-03 0.001RLPSPCOLBU 3.OOE-03 0.001RPMABCDCCS 1.70E-05 0.001RVC68AXXXC 2.66E-04 0.00 1RVC68BXXXC 2.66E-04 0.001RVM1OABCCN 1.30E-04 0.001RVM3436CCN 1.30E-05 0.001RVM34ABCCN 3.70E-05 0.001RVM34AXXXN 1.50E-03 0.001RVM34BXXXN 1.50E-03 0.001RVM36ABCCN 3.70E-05 0.001RVM36AXXXN 1.50E-03 0.001RVM36BXXXN 1.50E-03 0.001RVM4A6BCCN 3.70E-05 0.001RVM4B6ACCN 3.70E-05 0.001RVM60ABCCN 1.30E-04 0.001SPMABXXCCS 2.60E-04 0.001SPMALLXCCS 1.63E-05 0.001SPMP208BXU 2.98E-02 0.001SPMP208EXU 2.98E-02 0.001SVC3880BXN 1.57E-03 0.001SVC3880EXN 1.57E-03 0.001ETRANSFLAG 1.00E+00 0.001RVM29AXXXL i .20E-05 0.001RVM29BXXXL 1.20E-05 0.001EVM25BXXXL 1.20E-05 0.001CVM25 AXXXL 1.20E-05 0.001JAF-INSERT 4.65E-03 0.001Page 55 of 102 t-Entergy ENG REPORT PNPS-RPT-!

1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency System Data File for PILCDF2.SYS 1 1 CDFALLLMCDFSequence Data File: PILCDF2.SEQ PIL-SEQI PIL-SEQI11 1ESURROGATZ PIL-SEQ2 I1 1 3\ESURROGATZ PIL-SEQ2ELOSPXXXXZ CDFALLALLIHazard Data File: USGS.HAZ*Pilgrim 2008 USGS Hazard Curves*115...HAZHEAD (A40).N.-IAZ...NPHAZ1.0 ...PWI0.0148 0.0288 0.0401 0.0771 0.1065 0.1957 0.26100.3410 0.5161 0.6283 0.7936 0.9000 1.0464 1.38321.87446.76E-03 3.12E-03 2.06E-03 8.68E-04 5.55E-04 2.23E-04 1.38E-048.57E-05 3.11E-05 1.77E-05 9.51E-06 7.08E-06 4.65E-06 1.96E-065.99E-07IAZ(I)Page 56 of 102

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

I ALL 2.14E-05 2 No. Sequence Name Sequence Risk % of TotalI PIL-SEQ2 1.85E-05 86.602 PIL-SEQI 2.86E-06 13.40Sum: 2.14E-05 100.00Page 18SCDF2.BAS SHIP Basic OutputSummary of Plant Level Fragility Conditional Probability of Failure.050.150.250.500.750.850.950HCLPF (See note)Note: Best Estimate Case HCLPFPGA (g).400.471.500.572.685.754.888.326HCLPF = Ground motion level for which there is a highconfidence 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

1. 5Names File for PILRUN1.NAM PILRUN 1 .GENPILRUN1 .SYSPILRUN 1 .CMPPILRUN1 .SEQUSGS.HAZBasic Input File for PILRUN I.GENPilgrim SPRABoston Edison CompanyLevel 1 PRARANOPO1 1 211111111 129 7 122 1 2 1 nsupcmp,ncomps,ncmpnln,nr,nsys,nseq,ndmg PGA (g)1 .04 .02 0.98 12902Page 58 of 102 A- EENG REPORT PNPS-RPT-1 1-00001t-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency Basic Event Data File for PILRUN1.CMP ESISLXXXXZ SISLEBAAXXXXXZ 2.11 0.46 0 0EBABD3XXXZ 2.28 0.46 0 0EBCD1145XZ 2.11 0.46 0 0EBCDI2-13Z 2.28 0.46 0 0EBDDGBLDXZ 1.04 0.46 0 0EBSA5XXXXZ 1.76 0.46 0 0EBSA600XXZ 2.09 0.46 0 0EBSA6XXXXZ 2.09 0.46 0 0EBSA8XXXXZ 0.96 0.29 0.37 0EBSBIOXXXZ 2.24 0.46 0 0EBSB1415XZ 1.51 0.46 0 0EBSB1718XZ 2 0.46 0 0EBSBIXXXXZ 2 0.46 0 0EBSB2XXXXZ 1.13 0.46 0 0EBSB6XXXXZ 2 0.46 0 0EBSD16XXXZ 2.11 0.46 0 0EBSD17XXXZ 2.28 0.46 0 0EBSD4XXXXZ 2.11 0.46 0 0EBSD5XXXXZ 2.28 0.46 0 0EBSD7XXXXZ 2 0.46 0 0EBSY34XXXZ 1.49 0.46 0 0EBW185/1XZ 1.41 0.46 0 0EBW 195/23Z 2 0.46 0 0EBW198/OXZ 2.29 0.46 0 0EBW198/IXZ 3.43 0.33 0.72 0EBW198/2XZ 3.43 0.33 0.72 0EBW198/3XZ 2.29 0.46 0 0EBW209/OXZ 2 0.46 0 0EBW209/1XZ 1.72 0.46 0 0EBW210/OXZ 1.65 0.34 0.46 0EBW210/1XZ 1.84 0.46 0 0EBW210/3XZ 2 0.46 0 0EBW45/3XXZ 2 0.46 0 0ECBD29XXXZ 2.23 0.46 0 0ECBD30-31Z 2.28 0.46 0 0ECMKI03ABZ 1.73 0.46 0 0ECONTLRODZ 1.55 0.46 0 0ECOREPLATZ 2.9 0.46 0 0EDLGEABXXZ 1.39 0.32 0.57 0EDLGESBOXZ 2 0.46 0 0EDP2233ABZ 1.49 0.46 0 0EDPC2258XZ 2.13 0.46 0 0EDPC5XXXXZ 2.11 0.46 0 0EDPC6XXXXZ 2.11 0.46 0 0EDPC93023Z 2.28 0.46 0 0Page 59 of 102 S EntegW ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency EDPC93912Z 2.28 0.46 0 0EDRYWSUPPZ 2.62 0.46 0 0EDWSHIELDZ 2.04 0.46 0 0EFN201ABXZ 2 0.46 0 0EFN202ABXZ 2 0.46 0 0EFN203ABXZ 2 0.46 0 0EFN204ABXZ 2 0.46 0 0EFN204CDXZ 2 0.46 0 0EFN207A-DZ 2 0.46 0 0EFNDWCOOLZ 1.06 0.46 0 0EFUAXXXXXZ 2.23 0.46 0 0EFUBXXXXXZ 2.5 0.46 0 0EFUD3XXXXZ 2.28 0.46 0 0EFUELCHANZ 3.96 0.46 0 0EINCORHOUZ 2.75 0.46 0 0EINTKPANLZ 4.54 0.46 0 0EISLOCACSZ 0 0.46 0 0EISLOCRHRZ 0 0.46 0 0ELOCAHPCIZ 2.5 0.46 0 0ELOCARCICZ 2.5 0.46 0 0EPM141ABXZ 1.73 0.46 0 0EPM 184AXXZ 1.42 0.46 0 0EPM202A-FZ 2.13 0.46 0 0EPM203A-DZ 2.33 0.46 0 0EPM208A-EZ 2.32 0.46 0 0EPTHPCIXXZ 2.33 0.46 0 0EPTRCICXXZ 2.33 0.46 0 0ERBTRKLOKZ 3.55 0.46 0 0ERE12759!Z 0.89 0.31 0.51 0ERE12769!Z 1.04 0.31 0.51 0EREI32X9!Z 1.5 0.31 0.51 0EREI425B!Z 1.14 0.31 0.51 0EREI5159!Z 0.89 0.31 0.51 0EREI5169!Z 1.04 0.31 0.51 0EREI59X9!Z 2.22 0.31 0.51 0ERE16059!Z 0.89 0.31 0.51 0ERE16069!Z 1.04 0.31 0.51 0ERE18159!Z 0.89 0.31 0.51 0ERE18169!Z 1.04 0.31 0.51 0EREI865X!Z 0.73 0.31 0.51 0ERE18681!Z 1.34 0.31 0.51 0ERE18759!Z 0.89 0.31 0.51 0ERE18769!Z 1.04 0.31 0.51 0ERE18781!Z 0.25 0.31 0.51 0ERE2352X!Z 1.2 0.31 0.51 0ERE2759X!Z 1.55 0.31 0.51 0ERE27A5X!Z 0.89 0.31 0.51 0ERE27A6X!Z 1.04 0.31 0.51 0ERE32801!Z 1 0.31 0.51 0ERE40801!Z 0.67 0.31 0.51 0Page 60 of 102 EENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency ERE46801!Z 0.67 0.31 0.51 0ERE51N8l!Z 1 0.31 0.51 0ERE5ING8!Z 1 0.31 0.51 0ERE51V81!Z 1 0.31 0.51 0ERE59801!Z 1 0.31 0.51 0ERINGGIRDZ 2.54 0.46 0 0ERPVPEDESZ 3.27 0.46 0 0ERPVSTABLZ 1.52 0.46 0 0ERWCONCWLZ 1.93 0.46 0 0ERXBLDDWLZ 3.57 0.46 0 0ERXBLDFOUZ 1.76 0.46 0 0ESHDSPGUSZ 2.54 0.46 0 0ESURROGATZ 1 0.3 0 0ETBCONCWLZ 3.89 0.46 0 0ETKI05ABNZ 5 0.46 0 0ETKT105ABZ 1.27 0.46 0 0ETKT124ABZ 4.81 0.65 0 0ETKT126ABZ 1.44 0.46 0 0ETKT201ABZ 2.1 0.46 0 0ETOPGUIDEZ 2.56 0.46 0 0ETVX2iXXXZ 1.76 0.46 0 0ETVX22XXXZ 2.77 0.46 0 0ETVX55XXXZ 1.49 0.46 0 0EUPLOFLORZ 1.4 0.46 0 0EVA452122Z 2.9 0.46 0 0EVESUPSKTZ 6.15 0.46 0 0EVPEABXXXZ 1.73 0.46 0 0EVRCABXXXZ 1.73 0.46 0 0EVS4563ABZ 2.9 0.46 0 0EVS4563CDZ 2.9 0.46 0 0EVS4565CDZ 1.73 0.46 0 0EVS4582ABZ 2.9 0.46 0 0EVS4582CDZ 2.9 0.46 0 0ELOSPXXXXZ 0.35 0.55 0 0EBCD14XXXY 12 0.0000 21.0 0.0000 0.OOE+00EDLGESBOXY I2 0.0000 21.0 0.0000 0.OOE+00ELPSPPRPLY 12 0.0000 21.0 0.0000 0.OOE+00ESPCOOLXXY 12 0.0000 21.0 0.0000 0.OOE+00ESPC36ABXY 12 0.0000 21.0 0.0000 0.OOE+00ERERESET!Y IPage 61 of 102 A E tENG REPORT PNPS-RPT-I 1-00001ct-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency 2 0.0000 21.0 0.0000 0.00E+00EVMMO45X!Y 12 0.0000 21.0 0.0000 0.OOE+00ACB152501F 0.00E+00 0.001ACB152509L 0.OOE+00 0.001ACB152601F 0.OOE+00 0.001ACB152609L 0.OOE+00 0.001ACB152802F 0.OOE+00 0.001ACB5605CCN 0.OOE+00 0.001ACB5609CCC 0.OOE+00 0.001ADLADL3CCR 0.OOE+00 0.001ADLADLBCCR 0.OOE+00 0.00 1ADLADLBCCS 0.OOE+00 0.00 1ADLBDL3CCR 0.OOE+00 0.001ADLG123CCR 0.OOE+00 0.001ADLGEAXXXS 0.OOE+00 0.001ADLGEAXXXU 0.OOE+00 0.001ADLGEBXXXR 0.OOE+00 0.001ADLGEBXXXU 0.OOE+00 0.001ADLGESBOXS 0.OOE+00 0.001ADLGESBOXU 0.OOE+00 0.001ALOCALOOP 0.OOE+00 0.001APMI41AXXR 0.OOE+00 0.001APMI41BXXR 0.OOE+00 0.001APM184AXXR 0.OOE+00 0.001APM184AXXS 0.OOE+00 0.001AVA452XCCN 0.OOE+00 0.001BPM5XXXCCS 0.OOE+00 0.001BPMBXXXXXU 0.OOE+00 0.001BPMCXXXXXU 0.OOE+00 0.001BPMEXXXXXU 0.OOE+00 0.001BPMFXXXXXU 0.OOE+00 0.001BVM3801XXC 0.OOE+00 0.001BVM3805XXC 0.OOE+00 0.001CM 0.OOE+00 0.001CVC9AXXXXC 0.OOE+00 0.001CVC9BXXXXC 0.OOE+00 0.001DBC21 XXCCR 0.OOE+00 0.001DBCDI INORE 0.OOE+00 0.001DBCD11XXXU 0.OOE+00 0.001DBCD 12NORE 0.OOE+00 0.001DBCD12XXXU 0.OOE+00 0.001EBCD1IXXXR 0.OOE+00 0.001EBCD12XXXR 0.OOE+00 0.001ECBI52504F 0.OOE+00 0.001ECB152505N 0.OOE+00 0.001ECB152508L 0.OOE+00 0.001ECB 152509C 0.OOE+00 0.001Page 62 of 102 9% tENG REPORT PNPS-RPT-11-oooo1 c-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency ECB152600L 0.OOE+00 0.001ECB152604F 0.00E+00 0.001ECB152605N 0.OOE+00 0.001ECB152608L 0.00E+00 0.001ECB152609C 0.OOE+00 0.001ECBI52801C 0.OOE+00 0.001ECB152802N 0.OOE+00 0.001ECB5605AXY 0.OOE+00 0.001ECB5605DXY 0.00E+00 0.001EDLGEAXXXR 0.OOE+00 0.001EDLGEBXXXS 0.OOE+00 0.001EDLGESBOXR 0.OOE+00 0.001EffX209AXXU 0.OOE+00 0.001EHX209BXXU 0.OOE+00 0.001ELOCAHPCIR 0.OOE+00 0.001ELOCARCICR 0.OOE+00 0.001EPMI41AXXS 0.OOE+00 0.001EPMI41BXXS 0.OOE+00 0.001EPM208AXXS 0.OOE+00 0.001EPM208BXXS 0.OOE+00 0.001EPM208EXXS 0.OOE+00 0.001EPTHPCIXXR 0.OOE+00 0.00 1EPTRCICXXR 0.OOE+00 0.001EVA4521XXN 0.OOE+00 0.001EVA4522XXN 0.OOE+00 0.001EVM130117C 0.OOE+00 0.001EVM23015XC 0.OOE+00 0.001HPMAUXOILS 0.OOE+00 0.001IPME205XXS 0.OOE+00 0.001HPTHPCIXXS 0.OOE+00 0.001HPTHPRCCCR 0.OOE+00 0.001H-PTHPRCCCS 0.OOE+00 0.001HSYHPCIMNU 0.OOE+00 0.001H-VMMO35XXN 0.OOE+00 0.001HVMMO36XXN 0.OOE+00 0.001HVMMO3XXXN 0.OOE+00 0.001HVMMO6XXXC 0.OOE+00 0.001HVMM4O8XXXN 0.OOE+00 0.001ILPRCICMNU 0.OOE+00 0.001IPTRCICXXS 0.OOE+00 0.00 iIPVVACPMPS 0.OOE+00 0.001IVMINJVCCN 0.OOE+00 0.001IVMMO49XXN 0.OOE+00 0.001IVMMO6OXXC 0.OOE+00 0.001IVMMO61XXN 0.OOE+00 0.001IVMMO62XXN 0.OOE+00 0.001P 0.OOE+00 0.001RH-XE207AXU 0.OOE+00 0.001RHXE207BXU 0.OOE+00 0.001RLPSPCOLAU 0.OOE+00 0.001Page 63 of 102 AN EENG REPORT PNPS-RPT-11-00001 c-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency RLPSPCOLBU 0.00E+00 0.001RPMABCDCCS 0.OOE+00 0.001RVC68AXXXC 0.OOE+00 0.001RVC68BXXXC 0.OOE+00 0.001RVMIOABCCN 0.OOE+00 0.001RVM3436CCN 0.OOE+00 0.001RVM34ABCCN 0.OOE+00 0.001RVM34AXXXN 0.OOE+00 0.001RVM34BXXXN 0.OOE+00 0.001RVM36ABCCN 0.OOE+00 0.001RVM36AXXXN 0.OOE+00 0.001RVM36BXXXN 0.OOE+00 0.001RVM4A6BCCN 0.OOE+00 0.001RVM4B6ACCN 0.OOE+00 0.001RVM60ABCCN 0.OOE+00 0.001SPMABXXCCS 0.OOE+00 0.001SPMALLXCCS 0.OOE+00 0.001SPMP208BXU 0.OOE+00 0.001SPMP208EXU 0.OOE+00 0.001SVC3880BXN 0.OOE+00 0.001SVC3880EXN 0.OOE+00 0.001ETRANSFLAG 1.00E+00 0.001RVM29AXXXL 0.OOE+00 0.001RVM29BXXXL 0.OOE+00 0.001EVM25BXXXL 0.OOE+00 0.001CVM25AXXXL 0.OOE+00 0.001JAF-INSERT 4.65E-03 0.001Page 64 of 102 at-Entergy ENG REPORT PN PS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency System Data File for PILRUN1 .SYS1 1 CDFALLLMCDFSeauence Data File: PILRIJNI.SEO PIL-SEQI PIL-SEQI11 1ESURROGATZ PIL-SEQ2 I1 1 3\ESURROGATZ PIL-SEQ2ELOSPXXXXZ CDFALLALLIHazard Data File: USGS.HAZ*Pilgrim 2008 USGS Hazard Curves*115...HAZHEAD (A40)...NHAZ...NPHAZ1.0 ...PW10.0148 0.0288 0.0401 0.0771 0.1065 0.1957 0.26100.3410 0.5161 0.6283 0.7936 0.9000 1.0464 1.38321.87446.76E-03 3.12E-03 2.06E-03 8.68E-04 5.55E-04 2.23E-04 1.38E-048.57E-05 3.11E-05 1.77E-05 9.51E-06 7.08E-06 4.65E-06 1.96E-065.99E-07IAZ(I)Page 65 of 102

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

I ALL 1.20E-05 2 No. Sequence Name Sequence Risk % of TotalI PIL-SEQ2 9.1 IE-06 76.092 PIL-SEQ1 2.86E-06 23.91Sum: 1.20E-05 100.00Page 18RANOPO.BAS SHIP Basic OutputSummary of Plant Level Fragility Conditional Probability of Failure.050.150.250.500.750.850.950HCLPF (See note)PGA (g).466.546.595.693.797.859.965.381Note: Best Estimate Case HCLPFHCLPF = Ground motion level for which there is a highconfidence of a low probability of failureAmed

• 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 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation

1. 6Names File for PILEPRI1.NAM PILEPRI 1 .GENPILEPRIL

.SYSPILEPRI 1 .CMPPILEPRI 1 .SEQPILEPRI 1 .HAZPILEPRI 1 .NAM05-24-11Basic Input File for PILEPRI1.GEN Pilgrim SPRAEntergy NuclearUPDATED EPRI Base CDFEPRICDF11 1 21 1 1 11 1 11 129 7 122 1 2 1 nsupcmp,ncomps,ncmpnln,nr,nsys,nseq,ndmg PGA (g)1 .04 .02 0.98 12902PILEPRI 1.GEN05-24-11Page 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.CMIPESISLXXXXZ SISLEBAAXXXXXZ 2.11 0.46 0 0EBABD3XXXZ 2.28 0.46 0 0EBCD1145XZ 2.11 0.46 0 0EBCD12-13Z 2.28 0.46 0 0EBDDGBLDXZ 0.77 0.46 0 0EBSA5XXXXZ 1.76 0.46 0 0EBSA600XXZ 2.09 0.46 0 0EBSA6XXXXZ 2.09 0.46 0 0EBSA8XXXXZ 0.96 0.29 0.37 0EBSBIOXXXZ 2.24 0.46 0 0EBSB1415XZ 1.51 0.46 0 0EBSB1718XZ 2 0.46 0 0EBSBIXXXXZ 2 0.46 0 0EBSB2XXXXZ 0.84 0.46 0 0EBSB6XXXXZ 2 0.46 0 0EBSD16XXXZ 2.11 0.46 0 0EBSD17XXXZ 2.28 0.46 0 0EBSD4XXXXZ 2.11 0.46 0 0EBSD5XXXXZ 2.28 0.46 0 0EBSD7XXXXZ 2 0.46 0 0EBSY34XXXZ 1.49 0.46 0 0EBW185/1XZ 1.41 0.46 0 0EBW 195/23Z 1 0.46 0 0EBW198/OXZ 2.29 0.46 0 0EBW198/IXZ 3.43 0.33 0.72 0EBW 198/2XZ 3.43 0.33 0.72 0EBW198/3XZ 2.29 0.46 0 0EBW209/OXZ 0.82 0.46 0 0EBW209/1 XZ 1.72 0.46 0 0EBW210/OXZ 1.65 0.34 0.46 0EBW210/IXZ 1.84 0.46 0 0EBW210/3XZ 2 0.46 0 0EBW45/3XXZ 1.07 0.46 0 0ECBD29XXXZ 2.23 0.46 0 0ECBD30-3IZ 2.28 0.46 0 0ECMK103ABZ 1.28 0.46 0 0ECONTLRODZ 1.55 0.46 0 0ECOREPLATZ 2.9 0.46 0 0EDLGEABXXZ 1.39 0.32 0.57 0EDLGESBOXZ 2 0.46 0 0EDP2233ABZ 1.49 0.46 0 0EDPC2258XZ 2.13 0.46 0 0EDPC5XXXXZ 2.11 0.46 0 0EDPC6XXXXZ 2.11 0.46 0 0Page 68 of 102 A- ENG REPORT PN PS-RPT-1 1-00001ctEntergy Re-assessment of Pilgrim Seismic Core Damage Frequency EDPC93023Z 2.28 0.46 0 0EDPC93912Z 2.28 0.46 0 0EDRYWSUPPZ 2.62 0.46 0 0EDWSHIELDZ 2.04 0.46 0 0EFN201 ABXZ 1.23 0.46 0 0EFN202ABXZ 1.23 0.46 0 0EFN203ABXZ 1.23 0.46 0 0EFN204ABXZ 0.61 0.46 0 0EFN204CDXZ 0.61 0.46 0 0EFN207A-DZ 1.01 0.46 0 0EFNDWCOOLZ 1.06 0.46 0 0EFUAXXXXXZ 2.23 0.46 0 0EFUBXXXXXZ 2.5 0.46 0 0EFUD3XXXXZ 2.28 0.46 0 0EFUELCHANZ 3.96 0.46 0 0EINCORHOUZ 2.75 0.46 0 0EINTKPANLZ 4.54 0.46 0 0EISLOCACSZ 0 0.46 0 0EISLOCRHRZ 0 0.46 0 0ELOCAHPCIZ 2.5 0.46 0 0ELOCARCICZ 2.5 0.46 0 0EPM 141 ABXZ 1.28 0.46 0 0EPM 184AXXZ 1.05 0.46 0 0EPM202A-FZ 2.13 0.46 0 0EPM203A-DZ 2.33 0.46 0 0EPM208A-EZ 2.32 0.46 0 0EPTHPCIXXZ 2.33 0.46 0 0EPTRCICXXZ 2.33 0.46 0 0ERBTRKLOKZ 3.55 0.46 0 0ERE12759!Z 0.89 0.31 0.51 0ERE12769!Z 1.04 0.31 0.51 0EREI32X9!Z 0.55 0.31 0.51 0ERE1425B!Z 1.14 0.31 0.51 0ERE15159!Z 0.89 0.31 0.51 0ERE15169!Z 1.04 0.31 0.51 0ERE159X9!Z 0.55 0.31 0.51 0ERE16059!Z 0.89 0.31 0.51 0ERE16069!Z 1.04 0.31 0.51 0ERE18159!Z 0.89 0.31 0.51 0EREI8169!Z 1.04 0.31 0.51 0ERE1865X!Z 0.73 0.31 0.51 0ERE18681!Z 1.34 0.31 0.51 0ERE18759!Z 0.89 0.31 0.51 0ERE18769!Z 1.04 0.31 0.51 0ERE18781

!Z 0.25 0.31 0.51 0ERE2352X!Z 1.2 0.31 0.51 0ERE2759X!Z 1.55 0.31 0.51 0ERE27A5X!Z 0.89 0.31 0.51 0ERE27A6X!Z 1.04 0.31 0.51 0Page 69 of 102 A-E t ENG REPORT PN PS-RPT-1 1-00001c!'Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency ERE32801!Z 1 0.31 0.51 0ERE40801

!Z 0.67 0.31 0.51 0ERE46801!Z 0.67 0.31 0.51 0ERE51N81!Z 1 0.31 0.51 0ERE51NG8!Z 1 0.31 0.51 0ERE51V81!Z 1 0.31 0.51 0ERE59801

!Z 1 0.31 0.51 0ERINGGIRDZ 2.54 0.46 0 0ERPVPEDESZ 3.27 0.46 0 0ERPVSTABLZ 1.52 0.46 0 0ERWCONCWLZ 1.93 0.46 0 0ERXBLDDWLZ 3.57 0.46 0 0ERXBLDFOUZ 1.76 0.46 0 0ESHDSPGUSZ 2.54 0.46 0 0ESURROGATZ 1 0.3 0 0ETBCONCWLZ 3.89 0.46 0 0ETKI05ABNZ 0.16 0.46 0 0ETKT105ABZ 0.94 0.46 0 0ETKT124ABZ 4.81 0.65 0 0ETKT126ABZ 1.44 0.46 0 0ETKT201ABZ 2.1 0.46 0 0ETOPGUIDEZ 2.56 0.46 0 0ETVX21XXXZ 1.76 0.46 0 0ETVX22XXXZ 2.77 0.46 0 0ETVX55XXXZ 1.49 0.46 0 0EUPLOFLORZ 1.4 0.46 0 0EVA452122Z 2.9 0.46 0 0EVESUPSKTZ 6.15 0.46 0 0EVPEABXXXZ 1.28 0.46 0 0EVRCABXXXZ 1.28 0.46 0 0EVS4563ABZ 2.9 0.46 0 0EVS4563CDZ 2.9 0.46 0 0EVS4565CDZ 1.28 0.46 0 0EVS4582ABZ 2.9 0.46 0 0EVS4582CDZ 2.9 0.46 0 0ELOSPXXXXZ 0.35 0.55 0 0EBCDI4XXXY

!5 0.0000 0.15 0.4999 0.5 21.0 2.5e-2 2.50E-02 2.50E-01 5.OOE-01 5.OOE-01EDLGESBOXY 15 0.0000 0.15 0.4999 0.5 21.0 3.2e-3 3.20E-03 3.20E-02 5.OOE-01 5.OOE-0 IELPSPPRPLY 15 0.0000 0.15 0.4999 0.5 21.0 4.0e-3 4.OOE-03 4.OOE-02 1.00E+00 1.00E+00ESPCOOLXXY 15 0.0000 0.15 0.4999 0.5 21.0 5.1e-4 5.1OE-04 5.10E-03 5.OOE-0I 5.OOE-01ESPC36ABXY IPage 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 21.0 5.0e-I 5.00E-01 5.OOE-01 7.50E-01 7.50E-01ERERESET!Y 15 0.0000 0.15 0.4999 0.5 21.0 9.OE-2 9.OOE-02 5.OOE-01 5.OOE-01 5.OOE-01EVMMO45X!Y I5 0.0000 0.15 0.4999 0.5 21.0 6.6E-2 6.60E-02 5.OOE-01 5.OOE-01 5.00E-01ACB152501F 1.49E-04 0.001ACB152509L 1.49E-04 0.001ACB152601F 1.49E-04 0.001ACB152609L 1.49E-04 0.001ACB152802F 1.49E-04 0.001ACB5605CCN 2.21E-05 0.001ACB5609CCC 8.86E-05 0.001ADLADL3CCR 2.64E-04 0.001ADLADLBCCR 2.64E-04 0.001ADLADLBCCS 4.90E-05 0.001ADLBDL3CCR 2.64E-04 0.001ADLGI23CCR 1.32E-05 0.001ADLGEAXXXS 4.80E-03 0.001ADLGEAXXXU 1.18E-02 0.001ADLGEBXXXR 7.92E-03 0.001ADLGEBXXXU 1.18E-02 0.001ADLGESBOXS 4.80E-03 0.001ADLGESBOXU 1.14E-02 0.001ALOCALOOP i.OOE+00 0.001APM141AXXR 6.84E-04 0.001APM141BXXR 6.84E-04 0.001APM184AXXR 6.84E-04 0.001APM184AXXS 4.95E-04 0.001AVA452XCCN 4.OOE-05 0.001BPM5XXXCCS 4.80E-05 0.001BPMBXXXXXU 1.09E-02 0.001BPMCXXXXXU 1.09E-02 0.001BPMEXXXXXU 1.09E-02 0.001BPMFXXXXXU 1.09E-02 0.001BVM3801XXC 1.65E-03 0.001BVM3805XXC 1.65E-03 0.001CM 7.50E-06 0.001CVC9AXXXXC 2.66E-04 0.001CVC9BXXXXC 2.66E-04 0.001DBC21XXCCR 1.57E-05 0.001DBCDI INORE 6.80E-01 0.001DBCDII XXXU 7.30E-04 0.001DBCDI2NORE 6.80E-01 0.001DBCD12XXXU 7.30E-04 0.001EBCDI IXXXR 2.98E-04 0.001EBCD12XXXR 2.98E-04 0.001Page 71 of 102 A EntENG REPORT PN PS-RPT-1 1-00001Tt-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency ECB152504F 1.49E-04 0.001ECB152505N 1.99E-04 0.001ECB152508L 1.49E-04 0.001ECB152509C 7.97E-04 0.00 1ECB 152600L 1.49E-04 0.001ECB 152604F 1.49E-04 0.001ECB I 52605N 1.99E-04 0.001ECB152608L 1.49E-04 0.001ECB I 52609C 7.97E-04 0.001ECB 152801C 1.99E-04 0.001ECB I 52802N 1.99E-04 0.001ECB5605AXY 1.00E+00 0.001ECB5605DXY 1.00E+00 0.001EDLGEAXXXR 7.92E-03 0.001EDLGEBXXXS 4.80E-03 0.001EDLGESBOXR 7.92E-03 0.001EH-X209AXXU 2.66E-02 0.001EHX209BXXU 2.66E-02 0.001ELOCAHPCIR 1.23E-04 0.001ELOCARCICR 1.23E-04 0.001EPMI41AXXS 4.95E-04 0.001EPM141BXXS 4.95E-04 0.001EPM208AXXS 9.20E-03 0.001EPM208BXXS 9.20E-03 0.001EPM208EXXS 9.20E-03 0.001EPTHPCIXXR 1.96E-02 0.001EPTRCiCXXR 1.96E-02 0.001EVA4521XXN 1.60E-04 0.001EVA4522XXN 1.60E-04 0.001EVMI30117C 1.65E-03 0.001EVM23015XC 1.65E-03 0.001HPMAUXOILS 3.OOE-03 0.001HPME205XXS 3.OOE-03 0.001HPTHPCIXXS 6.11E-03 0.001HPTHPRCCCR 3.56E-04 0.001HPTHPRCCCS 3.90E-04 0.001HSYHPCIMNU 2.54E-02 0.001HVMMO35XXN 1.65E-03 0.001HVMMO36XXN 1.65E-03 0.001HVMMO3XXXN 1.30E-02 0.001HVMMO6XXXC 1.65E-03 0.001HVMMO8XXXN 1.65E-03 0.001ILPRCICMNU 3.55E-02 0.001IPTRCICXXS 3.33E-02 0.001IPVVACPMPS 3.OOE-03 0.001IVMINJVCCN 1.30E-04 0.001IVMMO49XXN 1.50E-03 0.001IVNMMO60XXC 1.65E-03 0.001IVMMO61XXN 1.50E-03 0.001Page 72 of 102 is Ente v ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency IVMMO62XXN 1.65E-03 0.001P 6.80E-03 0.001RHXE207AXU 5.00E-04 0.001RI-XE207BXU 5.00E-04 0.001RLPSPCOLAU 3.OOE-03 0.001RLPSPCOLBU 3.OOE-03 0.001RPMABCDCCS 1.70E-05 0.001RVC68AXXXC 2.66E-04 0.001RVC68BXXXC 2.66E-04 0.001RVMIOABCCN 1.30E-04 0.001RVM3436CCN 1.30E-05 0.001RVM34ABCCN 3.70E-05 0.001RVM34AXXXN 1.50E-03 0.001RVM34BXXXN 1.50E-03 0.001RVM36ABCCN 3.70E-05 0.001RVM36AXXXN 1.50E-03 0.001RVM36BXXXN 1.50E-03 0.001RVM4A6BCCN 3.70E-05 0.001RVM4B6ACCN 3.70E-05 0.001RVM60ABCCN 1.30E-04 0.001SPMABXXCCS 2.60E-04 0.001SPMALLXCCS 7.OOE-04 0.001SPMP208BXU 2.98E-02 0.001SPMP208EXU 2.98E-02 0.001SVC3880BXN 1.57E-03 0.001SVC3880EXN 1.57E-03 0.001ETRANSFLAG 1.00E+00 0.001RVM29AXXXL 1.20E-05 0.001RVM29BXXXL 1.20E-05 0.001EVM25BXXXL 1.20E-05 0.001CVM25AXXXL 1.20E-05 0.001JAF-INSERT 4.65E-03 0.001PILRUN 1 .CMP5/18/2011 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 CDFALLLMCDFSeauence Data File: PILEPRI1.SEO PIL-SEQI PIL-SEQI11 1ESURROGATZ PIL-SEQ2 F1 1 3\ESURROGATZ

,IL-SEQ2ELOSPXXXXZ CDFALLALLIHazard Data File: PILEPRI I.HAZ*Pilgrim Updated EPRI Hazard Cur'15ves* ..HAZHEAD (A40)...NHAZ.NPHAZ..PWHAZ(I)0.02 0.03 0.051.00.0010.070.002 0.005 0.010.1 0.2 0.30.5 1.0 1.52.01.15E-04 1.15E-04 1.15E-04 1.15E-04 1.15E-04 1.15E-04 1.15E-041.11E-04 1.02E-04 7.20E-05 5.22E-05 2.99E-05 9.54E-06 3.98E-061.95E-06Page 74 of 102 ct-Entergy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Page 17EPRICDF 1.BASSHIP Basic OutputNo. Damage State Damage State No. of Contributing Sequence RisksName Risk Sequences (in decreasing order of importance)

I ALL 2.15E-05 2 No. Sequence Name Sequence Risk % of TotalI PIL-SEQ2 1.90E-05 88.442 PIL-SEQI 2.49E-06 11.56Sum: 2.15E-05 100.00Page 18EPRICDF I.BASSHIP Basic OutputSummary of Plant Level Fragility Conditional Probability of Failure.050.150.250.500.750.850.950HCLPF (See note)PGA (g).314.378.418.490.543.630.808.252Note: Best Estimate Case HCLPFHCLPF = Ground motion level for which there is a highconfidence 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

t-Entergy ENG REPORT PNPS-RPT-I 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation

1. 7Names File for PILRUNI.NAM PILRUN 1 .GENPILRUN 1 .SYSPILRUN I .CMPPILRUNI.SEQ PILEPRI 1 .HAZPILRUN 1 .NAM05-24-11Basic Input File for PILRUNI .GENPilgrim SPRABoston Edison CompanyLevel 1 PRARANOPO1 1 21 1111 129 7 122 1 2PGA (g)1 .04 .01 0.98 12902PILRUN 1 .GEN5-24-11nsupcmp,ncomps,ncmpnln,nr,nsys,nseq,ndmg Page 76 of 102 Sc-Entery ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Basic Event Data File for PILRUNI .CMPESISLXXXXZ SISLEBAAXXXXXZ 2.11 0.46 0 0EBABD3XXXZ 2.28 0.46 0 0EBCD1145XZ 2.11 0.46 0 0EBCDI2-13Z 2.28 0.46 0 0EBDDGBLDXZ 1.04 0.46 0 0EBSA5XXXXZ 1.76 0.46 0 0EBSA600XXZ 2.09 0.46 0 0EBSA6XXXXZ 2.09 0.46 0 0EBSA8XXXXZ 0.96 0.29 0.37 0EBSBIOXXXZ 2.24 0.46 0 0EBSBI415XZ 1.51 0.46 0 0EBSBI718XZ 2 0.46 0 0EBSB IXXXXZ 2 0.46 0 0EBSB2XXXXZ 1.13 0.46 0 0EBSB6XXXXZ 2 0.46 0 0EBSD16XXXZ 2.11 0.46 0 0EBSD17XXXZ 2.28 0.46 0 0EBSD4XXXXZ 2.11 0.46 0 0EBSD5XXXXZ 2.28 0.46 0 0EBSD7XXXXZ 2 0.46 0 0EBSY34XXXZ 1.49 0.46 0 0EBW185/IXZ 1.41 0.46 0 0EBW195/23Z 2 0.46 0 0EBW198/OXZ 2.29 0.46 0 0EBWI98/IXZ 3.43 0.33 0.72 0EBW 198/2XZ 3.43 0.33 0.72 0EBW198/3XZ 2.29 0.46 0 0EBW209/OXZ 2 0.46 0 0EBW209/i XZ 1.72 0.46 0 0EBW210/OXZ 1.65 0.34 0.46 0EBW210/IXZ 1.84 0.46 0 0EBW210/3XZ 2 0.46 0 0EBW45/3XXZ 2 0.46 0 0ECBD29XXXZ 2.23 0.46 0 0ECBD30-31Z 2.28 0.46 0 0ECMKI03ABZ 1.73 0.46 0 0ECONTLRODZ 1.55 0.46 0 0ECOREPLATZ 2.9 0.46 0 0EDLGEABXXZ 1.39 0.32 0.57 0EDLGESBOXZ 2 0.46 0 0EDP2233ABZ 1.49 0.46 0 0EDPC2258XZ 2.13 0.46 0 0EDPC5XXXXZ 2.11 0.46 0 0EDPC6XXXXZ 2.11 0.46 0 0Page 77 of 102 SEntergyEDPC93023Z EDPC93912Z EDRYWSUPPZ EDWSHIELDZ EFN201 ABXZEFN202ABXZ EFN203ABXZ EFN204ABXZ EFN204CDXZ EFN207A-DZ EFNDWCOOLZ EFUAXXXXXZ EFUBXXXXXZ EFUD3XXXXZ EFUELCHANZ EINCORHOUZ EINTKPANLZ EISLOCACSZ EISLOCRHRZ ELOCAHPCIZ ELOCARCICZ EPM141ABXZ EPM 184AXXZEPM202A-FZ EPM203A-DZ EPM208A-EZ EPTHPCIXXZ EPTRCICXXZ ERBTRKLOKZ ERE12759!Z ERE12769!Z ERE I 32X9!ZERE1425B!Z EREI5159!Z ERE15169!Z ERE159X9!Z ERE16059!Z ERE16069!Z ERE18159!Z ERE18169!Z EREI865X!Z ERE 1868 H!ZERE 18759!ZERE 18769!ZERE18781!Z ERE2352X!Z ERE2759X!Z ERE27A5X!Z ERE27A6X!Z ENG REPORT PNPS-RPT-I 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency 2.28 0.46 0 02.28 0.46 0 02.62 0.46 0 02.04 0.46 0 02 0.46 0 02 0.46 0 02 0.46 0 02 0.46 0 02 0.46 0 02 0.46 0 01.06 0.46 0 02.23 0.46 0 02.5 0.46 0 02.28 0.46 0 03.96 0.46 0 02.75 0.46 0 04.54 0.46 0 00 0.46 0 00 0.46 0 02.5 0.46 0 02.5 0.46 0 01.73 0.46 0 01.42 0.46 0 02.13 0.46 0 02.33 0.46 0 02.32 0.46 0 02.33 0.46 0 02.33 0.46 0 03.55 0.46 0 00.89 0.31 0.51 01.04 0.31 0.51 01.5 0.31 0.51 01.14 0.31 0.51 00.89 0.31 0.51 01.04 0.31 0.51 02.22 0.31 0.51 00.89 0.31 0.51 01.04 0.31 0.51 00.89 0.31 0.51 01.04 0.31 0.51 00.73 0.31 0.51 01.34 0.31 0.51 00.89 0.31 0.51 01.04 0.31 0.51 00.25 0.31 0.51 01.2 0.31 0.51 01.55 0.31 0.51 00.89 0.31 0.51 01.04 0.31 0.51 0Page 78 of 102 A -ENG REPORT PNPS-RPT-1 1-00001z-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency ERE32801!Z 1 0.31 0.51 0ERE40801

!Z 0.67 0.31 0.51 0ERE46801!Z 0.67 0.31 0.51 0ERE51N81!Z 1 0.31 0.51 0ERE51NG8!Z 1 0.31 0.51 0ERE51V81!Z 1 0.31 0.51 0ERE59801!Z 1 0.31 0.51 0ERINGGIRDZ 2.54 0.46 0 0ERPVPEDESZ 3.27 0.46 0 0ERPVSTABLZ 1.52 0.46 0 0ERWCONCWLZ 1.93 0.46 0 0ERXBLDDWLZ 3.57 0.46 0 0ERXBLDFOUZ 1.76 0.46 0 0ESH-DSPGUSZ 2.54 0.46 0 0ESURROGATZ 1 0.3 0 0ETBCONCWLZ 3.89 0.46 0 0ETK 105ABNZ 5 0.46 0 0ETKT105ABZ 1.27 0.46 0 0ETKT124ABZ 4.81 0.65 0 0ETKT126ABZ 1.44 0.46 0 0ETKT201ABZ 2.1 0.46 0 0ETOPGUIDEZ 2.56 0.46 0 0ETVX21XXXZ 1.76 0.46 0 0ETVX22XXXZ 2.77 0.46 0 0ETVX55XXXZ 1.49 0.46 0 0EUPLOFLORZ 1.4 0.46 0 0EVA452122Z 2.9 0.46 0 0EVESUPSKTZ 6.15 0.46 0 0EVPEABXXXZ 1.73 0.46 0 0EVRCABXXXZ 1.73 0.46 0 0EVS4563ABZ 2.9 0.46 0 0EVS4563CDZ 2.9 0.46 0 0EVS4565CDZ 1.73 0.46 0 0EVS4582ABZ 2.9 0.46 0 0EVS4582CDZ 2.9 0.46 0 0ELOSPXXXXZ 0.35 0.55 0 0EBCDi4XXXY 12 0.0000 21.0 0.0000 0.OOE+00EDLGESBOXY 12 0.0000 21.0 0.0000 0.OOE+00ELPSPPRPLY 12 0.0000 21.0 0.0000 0.OOE+00ESPCOOLXXY 12 0.0000 21.0 0.0000 0.00E+00ESPC36ABXY IPage 79 of 102 A EENG REPORT PNPS-RPT-1 1-00001t-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency 2 0.0000 21.0 0.0000 0.OOE+00ERERESET!Y i2 0.0000 21.0 0.0000 O.OOE+00EVMMO45X!Y 12 0.0000 21.0 0.0000 0.OOE+00ACBI52501F 0.OOE+00 0.001ACB152509L 0.OOE+00 0.001ACB152601F 0.OOE+00 0.001ACB 152609L 0.OOE+00 0.001ACB152802F 0.OOE+00 0.001ACB5605CCN 0.OOE+00 0.001ACB5609CCC 0.OOE+00 0.001ADLADL3CCR 0.OOE+00 0.001ADLADLBCCR 0.OOE+00 0.001ADLADLBCCS 0.OOE+00 0.001ADLBDL3CCR 0.OOE+00 0.001ADLGI23CCR 0.OOE+00 0.001ADLGEAXXXS 0.OOE+00 0.001ADLGEAXXXU 0.OOE+00 0.001ADLGEBXXXR 0.OOE+00 0.001ADLGEBXXXU 0.OOE+00 0.001ADLGESBOXS 0.OOE+00 0.001ADLGESBOXU 0.OOE+00 0.001ALOCALOOP 0.OOE+00 0.001APM141AXXR 0.OOE+00 0.001APM141BXXR 0.OOE+00 0.001APM184AXXR 0.OOE+00 0.001APM I 84AXXS 0.OOE+00 0.001AVA452XCCN 0.OOE+00 0.001BPM5XXXCCS 0.OOE+00 0.001BPMBXXXXXU 0.OOE+00 0.001BPMCXXXXXU 0.OOE+00 0.001BPMEXXXXXU 0.OOE+00 0.001BPMFXXXXXU 0.OOE+00 0.001BVM3801XXC 0.OOE+00 0.001BVM3805XXC 0.OOE+00 0.001CM 0.OOE+00 0.001CVC9AXXXXC 0.OOE+00 0.001CVC9BXXXXC 0.OOE+00 0.001DBC2IXXCCR 0.OOE+00 0.001DBCDIINORE 0.OOE+00 0.001DBCDI IXXXU 0.OOE+00 0.001DBCD12NORE 0.OOE+00 0.001DBCD12XXXU 0.OOE+00 0.001EBCDI IXXXR 0.OOE+00 0.001EBCD12XXXR 0.OOE+00 0.001Page 80 of 102 is -ENG REPORT PNPS-RPT-1 1-00001~EntergyRe-assessment of Pilgrim Seismic Core Damage Frequency ECB152504F 0.OOE+00 0.001ECB 152505N 0.OOE+00 0.001ECB152508L 0.00E+00 0.001ECB 152509C 0.00E+00 0.001ECB152600L 0.OOE+00 0.001ECB 152604F 0.OOE+00 0.001ECB 152605N 0.OOE+00 0.001ECBI52608L 0.OOE+00 0.001ECB 152609C 0.OOE+00 0.001ECBI52801C 0.OOE+00 0.001ECB152802N 0.OOE+00 0.001ECB5605AXY 0.OOE+00 0.001ECB5605DXY 0.OOE+00 0.001EDLGEAXXXR 0.OOE+00 0.001EDLGEBXXXS 0.OOE+00 0.001EDLGESBOXR 0.OOE+00 0.001EHX209AXXU 0.OOE+00 0.001EHX209BXXU 0.OOE+00 0.001ELOCAHPCIR 0.OOE+00 0.001ELOCARCICR 0.OOE+00 0.001EPMI41AXXS 0.OOE+00 0.001EPM141BXXS 0.OOE+00

.0.001EPM208AXXS 0.OOE+00 0.001EPM208BXXS 0.OOE+00 0.001EPM208EXXS 0.OOE+00 0.001EPTHPCIXXR 0.OOE+00 0.001EPTRCICXXR 0.OOE+00 0.001EVA4521XXN 0.OOE+00 0.001EVA4522XXN 0.OOE+00 0.001EVM130117C 0.OOE+00 0.001EVM23015XC 0.OOE+00 0.001HPMAUXOILS 0.OOE+00 0.001HPME205XXS 0.OOE+00 0.001HPTHPCIXXS 0.OOE+00 0.001HPTHPRCCCR 0.OOE+00 0.001HPTHPRCCCS 0.OOE+00 0.001HSYHPCIMNU 0.OOE+00 0.001HVMMO35XXN 0.OOE+00 0.001HVMMO36XXN 0.OOE+00 0.001HVMMO3XXXN 0.OOE+00 0.001HVMMO6XXXC 0.OOE+00 0.001HVMMO8XXXN 0.OOE+00 0.001ILPRCICMNU 0.OOE+00 0.001IPTRCICXXS 0.OOE+00 0.001IPVVACPMPS 0.OOE+00 0.001IVMINJVCCN 0.OOE+00 0.001IVMMO49XXN 0.OOE+00 0.001IVMMO6OXXC 0.OOE+00 0.001IVMMO61XXN 0.OOE+00 0.001Page 81 of 102 IEntergy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency IVMMO62XXN 0.O0E+00 0.001P 0.OOE+00 0.001RHXE207AXU 0.OOE+00 0.001RHXE207BXU 0.OOE+00 0.001RLPSPCOLAU 0.OOE+00 0.001RLPSPCOLBU 0.OOE+00 0.001RPMABCDCCS 0.OOE+00 0.001RVC68AXXXC 0.OOE+00 0.001RVC68BXXXC 0.OOE+00 0.001RVM1OABCCN 0.OOE+00 0.001RVM3436CCN 0.OOE+00 0.001RVM34ABCCN 0.OOE+00 0.001RVM34AXXXN 0.OOE+00 0.001RVM34BXXXN 0.OOE+00 0.001RVM36ABCCN 0.OOE+00 0.001RVM36AXXXN 0.OOE+00 0.001RVM36BXXXN 0.OOE+00 0.001RVM4A6BCCN 0.OOE+00 0.001RVM4B6ACCN 0.OOE+00 0.001RVM60ABCCN 0.OOE+00 0.001SPMABXXCCS 0.OOE+00 0.001SPMALLXCCS 0.OOE+00 0.001SPMP208BXU 0.OOE+00 0.001SPMP208EXU 0.OOE+00 0.001SVC3880BXN 0.OOE+00 0.001SVC3880EXN 0.OOE+00 0.001ETRANSFLAG 1.00E+00 0.001RVM29AXXXL 0.OOE+00 0.001RVM29BXXXL 0.OOE+00 0.001EVM25BXXXL 0.OOE+00 0.001CVM25AXXXL 0.OOE+00 0.001JAF-INSERT 4.65E-03 0.001PILRUN I.CMP5/18/2011 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 .SYSI I CDFALLLMCDFSequence Data File: PILRUN 1.SEOPIL-SEQI PIL-SEQI11 1ESURROGATZ PIL-SEQ2 I1 1 3\ESURROGATZ PIL-SEQ2ELOSPXXXXZ CDFALLALLIHazard Data File: PILEPRI I.HAZ*Pilgrim Updated EPRI Hazard Curves*1151.00.001 0.002 0.005 0.01 0.020.07 0.1 0.2 0.3 0.5 1.02.01.15E-04 1.15E-04 1.15E-04 1.15E-041.11E-04 1.02E-04 7.20E-05 5.22E-051.95E-06..HAZHEAD (A40)...NHAZ.NPHAZ..PWHAZ(I)0.03 0.051.51.15E-04 1.15E-04 1.15E-042.99E-05 9.54E-06 3.98E-06Page 83 of 102 ct-Entergy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Page 17RANOPO.BAS SHIP Basic OutputNo. Damage State Damage State No. of Contributing Sequence RisksName Risk Sequences (in decreasing order of importance)

I ALL 8.97E-06 2 No. Sequence Name Sequence Risk % of Total1 PIL-SEQ2 6.57E-06 73.192 PIL-SEQI 2.41E-06 26.81Sum: 8.97E-06 100.00Page 18RANOPO.BAS SHIP Basic OutputSummary of Plant Level Fragility Conditional Probability of Failure.050.150.250.500.750.850.950HCLPF (See note)PGA (g).466.546.595.693.798.858.962.381Note: Best Estimate Case HCLPFHCLPF = Ground motion level for which there is a highconfidence 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 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation

1. 8Names File for P11CDFI .NAMPILCDF1 .GENPILCDF1.SYS PILCDF1 .CMPPILCDF1.SEQ PILEPRI 1 .HAZPILCDF1.NAM 05-24-11Basic Input File for PILCDF1 .GENPilgrim SPRAEntergy NuclearFRAG&BE Data (EPRI)SCDF11 1 21 1111 111 129 7 122 1 2 1PGA (g)1 .04 .01 0.98 12902PILCDF 1 .GEN05-24-11nsupcmp,ncomps,ncmpnln,nr,nsys,nseq,ndmg Page 85 of 102 AEENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Basic Event Data File for PILCDF1 .CMPESISLXXXXZ SISLEBAAXXXXXZ 2.11 0.46 0 0EBABD3XXXZ 2.28 0.46 0 0EBCD1145XZ 2.11 0.46 0 0EBCD12-13Z 2.28 0.46 0 0EBDDGBLDXZ 1.04 0.46 0 0EBSA5XXXXZ 1.76 0.46 0 0EBSA600XXZ 2.09 0.46 0 0EBSA6XXXXZ 2.09 0.46 0 0EBSA8XXXXZ 0.96 0.29 0.37 0EBSB IOXXXZ 2.24 0.46 0 0EBSB1415XZ 1.51 0.46 0 0EBSB1718XZ 2 0.46 0 0EBSBiXXXXZ 2 0.46 0 0EBSB2XXXXZ 1.13 0.46 0 0EBSB6XXXXZ 2 0.46 0 0EBSD16XXXZ 2.11 0.46 0 0EBSD17XXXZ 2.28 0.46 0 0EBSD4XXXXZ 2.11 0.46 0 0EBSD5XXXXZ 2.28 0.46 0 0EBSD7XXXXZ 2 0.46 0 0EBSY34XXXZ 1.49 0.46 0 0EBW185/IXZ 1.41 0.46 0 0EBW195/23Z 2 0.46 0 0EBW I98/OXZ 2.29 0.46 0 0EBW198/1XZ 3.43 0.33 0.72 0EBW198/2XZ 3.43 0.33 0.72 0EBW198/3XZ 2.29 0.46 0 0EBW209/OXZ 2 0.46 0 0EBW209/1 XZ 1.72 0.46 0 0EBW210/OXZ 1.65 0.34 0.46 0EBW210/1XZ 1.84 0.46 0 0EBW210/3XZ 2 0.46 0 0EBW45/3XXZ 2 0.46 0 0ECBD29XXXZ 2.23 0.46 0 0ECBD30-3 IZ 2.28 0.46 0 0ECMKI03ABZ 1.73 0.46 0 0ECONTLRODZ 1.55 0.46 0 0ECOREPLATZ 2.9 0.46 0 0EDLGEABXXZ 1.39 0.32 0.57 0EDLGESBOXZ 2 0.46 0 0EDP2233ABZ 1.49 0.46 0 0EDPC2258XZ 2.13 0.46 0 0Page 86 of 102

!t-Entergy ENG REPORT PN PS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency EDPC5XXXXZ 2.11 0.46 0 0EDPC6XXXXZ 2.11 0.46 0 0EDPC93023Z 2.28 0.46 0 0EDPC93912Z 2.28 0.46 0 0EDRYWSUPPZ 2.62 0.46 0 0EDWSHIELDZ 2.04 0.46 0 0EFN201ABXZ 2 0.46 0 0EFN202ABXZ 2 0.46 0 0EFN203ABXZ 2 0.46 0 0EFN204ABXZ 2 0.46 0 0EFN204CDXZ 2 0.46 0 0EFN207A-DZ 2 0.46 0 0EFNDWCOOLZ 1.06 0.46 0 0EFUAXXXXXZ 2.23 0.46 0 0EFUBXXXXXZ 2.5 0.46 0 0EFUD3XXXXZ 2.28 0.46 0 0EFUELCHANZ 3.96 0.46 0 0EINCORHOUZ 2.75 0.46 0 0EINTKPANLZ 4.54 0.46 0 0EISLOCACSZ 0 0.46 0 0EISLOCRIiRZ 0 0.46 0 0ELOCAHPCIZ 2.5 0.46 0 0ELOCARCICZ 2.5 0.46 0 0EPM 141ABXZ 1.73 0.46 0 0EPM I84AXXZ 1.42 0.46 0 0EPM202A-FZ 2.13 0.46 0 0EPM203A-DZ 2.33 0.46 0 0EPM208A-EZ 2.32 0.46 0 0EPTHPCIXXZ 2.33 0.46 0 0EPTRCICXXZ 2.33 0.46 0 0ERBTRKLOKZ 3.55 0.46 0 0ERE 12759!Z 0.89 0.31 0.51 0ERE 12769!Z 1.04 0.31 0.51 0ERE132X9!Z 1.5 0.31 0.51 0EREI425B!Z 1.14 0.31 0.51 0ERE 15159!Z 0.89 0.31 0.51 0ERE 15169!Z 1.04 0.31 0.51 0ERE159X9!Z 2.22 0.31 0.51 0ERE16059!Z 0.89 0.31 0.51 0ERE 16069!Z 1.04 0.31 0.51 0ERE 18159!Z 0.89 0.31 0.51 0EREI8169!Z 1.04 0.31 0.51 0ERE1865X!Z 0.73 0.31 0.51 0ERE18681!Z 1.34 0.31 0.51 0ERE18759!Z 0.89 0.31 0.51 0ERE18769!Z 1.04 0.31 0.51 0ERE18781!Z 0.25 0.31 0.51 0ERE2352X!Z 1.2 0.31 0.51 0ERE2759X!Z 1.55 0.31 0.51 0Page 87 of 102 A EENG REPORT PNPS-RPT-1 1-00001cý'-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency ERE27A5X!Z 0.89 0.31 0.51 0ERE27A6X!Z 1.04 0.31 0.51 0ERE32801!Z 1 0.31 0.51 0ERE40801!Z 0.67 0.31 0.51 0ERE46801!Z 0.67 0.31 0.51 0ERE51N81!Z 1 0.31 0.51 0ERE51NG8!Z 1 0.31 0.51 0ERE51V81!Z 1 0.31 0.51 0ERE59801!Z 1 0.31 0.51 0ERINGGIRDZ 2.54 0.46 0 0ERPVPEDESZ 3.27 0.46 0 0ERPVSTABLZ 1.52 0.46 0 0ERWCONCWLZ 1.93 0.46 0 0ERXBLDDWLZ 3.57 0.46 0 0ERXBLDFOUZ 1.76 0.46 0 0ESHDSPGUSZ 2.54 0.46 0 0ESURROGATZ 1 0.3 0 0ETBCONCWLZ 3.89 0.46 0 0ETK 105ABNZ 5 0.46 0 0ETKT105ABZ 1.27 0.46 0 0ETKT124ABZ 4.81 0.65 0 0ETKT126ABZ 1.44 0.46 0 .0ETKT201ABZ 2.1 0.46 0 0ETOPGUIDEZ 2.56 0.46 0 0ETVX21 XXXZ 1.76 0.46 0 0ETVX22XXXZ 2.77 0.46 0 0ETVX55XXXZ 1.49 0.46 0 0EUPLOFLORZ 1.4 0.46 0 0EVA452122Z 2.9 0.46 0 0EVESUPSKTZ 6.15 0.46 0 0EVPEABXXXZ 1.73 0.46 0 0EVRCABXXXZ 1.73 0.46 0 0EVS4563ABZ 2.9 0.46 0 0EVS4563CDZ 2.9 0.46 0 0EVS4565CDZ 1.73 0.46 0 0EVS4582ABZ 2.9 0.46 0 0EVS4582CDZ 2.9 0.46 0 0ELOSPXXXXZ 0.35 0.55 0 0EBCDI4XXXY 15 0.0000 0.15 0.4999 0.5 21.0 2.5e-2 2.50E-02 2.50E-01 5.OOE-01 5.OOE-01EDLGESBOXY

!5 0.0000 0.15 0.4999 0.5 21.0 3.2e-3 3.20E-03 3.20E-02 5.OOE-01 5.OOE-0 IELPSPPRPLY 15 0.0000 0.15 0.4999 0.5 21.0 4.0e-3 4.OOE-03 4.OOE-02 1.00E+00 1.00E+00ESPCOOLXXY 15 0.0000 0.15 0.4999 0.5 2Page 88 of 102 IsEntergy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency 1.0, 5.1e-4ESPC36ABXY 5 0.00001.0 5.0e- 1ERERESET!Y 5 0.00001.0 9.OE-2EVMMO45X!Y 5 0.00001.0 6.6E-2ACB152501F ACB152509L ACB152601F ACB152609L ACB152802F ACB5605CCN ACB5609CCC ADLADL3CCR ADLADLBCCR ADLADLBCCS ADLBDL3CCR ADLG 123CCRADLGEAXXXS ADLGEAXXXU ADLGEBXXXR ADLGEBXXXU ADLGESBOXS ADLGESBOXU ALOCALOOP APM141AXXR APMI41BXXR APM 184AXXRAPM 184AXXSAVA452XCCN BPM5XXXCCS BPMBXXXXXU BPMCXXXXXU BPMEXXXXXU BPMFXXXXXU BVM3801XXC BVM3805XXC CMCVC9AXXXXC CVC9BXXXXC DBC2 I XXCCRDBCD I INOREDBCDI IXXXUDBCD I 2NOREDBCD 12XXXU5.10E-0410.155.OOE-01!0.159.OOE-020.156.60E-021.49E-041 .49E-041.49E-041.49E-041.49E-042.21 E-058.86E-052.64E-042.64E-044.90E-052.64E-041.32E-054.80E-031.18E-027.92E-031.09E-024.80E-031.42E-021.00E+006.84E-046.84E-046.84E-044.95E-044.OOE-054.80E-051.09E-021.09E-021.09E-021.09E-021.65E-031.65E-037.50E-062.66E-042.66E-041.57E-056.80E-017.30E-046.80E-017.30E-045. 1OE-03 5.OOE-02 5.OOE-020.49995.OOE-010.49995.OOE-010.49995.OOE-010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.57.50E-0127.50E-010.5 25.O0E-01 5.OOE-010.55.OOE-0125.00E-01I Page 89 of 102 A nENG REPORT PNPS-RPT-1 1-00001t-Entergy Re-assessment of Pilgrim Seismic Core Damage Frequency EBCDII XXXR 2.98E-04 0.001EBCDI2XXXR 2.98E-04 0.001ECB152504F 1.49E-04 0.001ECB152505N 1.99E-04 0.001ECB152508L 1.49E-04 0.001ECB152509C 7.97E-04 0.001ECB I 52600L 1.49E-04 0.001ECB 152604F 1.49E-04 0.001ECB 152605N 1.99E-04 0.001ECBI52608L 1.49E-04 0.001ECB 152609C 7.97E-04 0.001ECB152801C 1.99E-04 0.001ECB152802N 1.99E-04 0.001ECB5605AXY 1.00E+00 0.001ECB5605DXY 1.00E+00 0.001EDLGEAXXXR 7.92E-03 0.001EDLGEBXXXS 4.80E-03 0.001EDLGESBOXR 7.92E-03 0.001EHX209AXXU 2.66E-02 0.001EHX209BXXU 2.66E-02 0.001ELOCAHPCIR 1.23E-04 0.001ELOCARCICR 1.23E-04 0.001EPM141AXXS 4.95E-04 0.001EPMI41BXXS 4.95E-04 0.001EPM208AXXS 9.20E-03 0.001EPM208BXXS 9.20E-03 0.001EPM208EXXS 9.20E-03 0.001EPTHPCIXXR 3.93E-03 0.001EPTRCICXXR 9.78E-03 0.001EVA452IXXN 1.60E-04 0.001EVA4522XXN 1.60E-04 0.001EVM130117C 1.65E-03 0.001EVM23015XC 1.65E-03 0.001HPMAUXOILS 3.33E-03 0.001HPME205XXS 3.OOE-03 0.001HPTHPCIXXS 3.33E-03 0.001HPTHPRCCCR 2.31E-07 0.001HPTHPRCCCS

.3.46E-05 0.001HSYHPCIMNU 1.21E-02 0.001HVMMO35XXN 1.65E-03 0.001HVMMO36XXN 1.65E-03 0.001HVMMO3XXXN 1.03E-03 0.001HVMMO6XXXC 1.65E-03 0.001HVMMO8XXXN 1.65E-03 0.001ILPRCICMNU 8.74E-03 0.001IPTRCICXXS 3.33E-03 0.001IPVVACPMPS 3.OOE-03 0.001IVMINJVCCN 1.30E-04 0.001IVMMO49XXN 1.50E-03 0.001Page 90 of 102

---Entergy ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency IVMMO60XXC 1.65E-03 0.001IVMMO61XXN 1.50E-03 0.001IVMMO62XXN 1.65E-03 0.001P 6.80E-03 0.001RHXE207AXU 5.OOE-04 0.001RHXE207BXU 5.OOE-04 0.001RLPSPCOLAU 3.OOE-03 0.001RLPSPCOLBU 3.OOE-03 0.001RPMABCDCCS 1.70E-05 0.001RVC68AXXXC 2.66E-04 0.00 1RVC68BXXXC 2.66E-04 0.00 1RVM1OABCCN 1.30E-04 0.001RVM3436CCN 1.30E-05 0.001RVM34ABCCN 3.70E-05 0.001RVM34AXXXN 1.50E-03 0.001RVM34BXXXN 1.50E-03 0.001RVM36ABCCN 3.70E-05 0.001RVM36AXXXN 1.50E-03 0.001RVM36BXXXN 1.50E-03 0.001RVM4A6BCCN 3.70E-05 0.001RVM4B6ACCN 3.70E-05 0.001RVM60ABCCN 1.30E-04 0.001.SPMABXXCCS 2.60E-04 0.001SPMALLXCCS 1.63E-05 0.001SPMP208BXU 2.98E-02 0.001SPMP208EXU 2.98E-02 0.001SVC3880BXN 1.57E-03 0.001SVC3880EXN 1.57E-03 0.001ETRANSFLAG 1.00E+00 0.001RVM29AXXXL 1.20E-05 0.001RVM29BXXXL 1.20E-05 0.001EVM25BXXXL 1.20E-05 0.001CVM25AXXXL 1.20E-05 0.001JAF-INSERT 4.65E-03 0.001PILRUN I .CMP5/18/2011 Page 91 of 102 tt-Entergy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency System Data File for PILCDFI .SYSI I CDFALLLMCDFSequence Data File: PILCDF1.SEQ PIL-SEQI PIL-SEQI11 1ESURROGATZ PIL-SEQ2 F1 1 3\ESURROGATZ

,IL-SEQ2ELOSPXXXXZ CDFALLALLIHazard Data File: PILEPRI I.HAZ*Pilgrim Updated EPRI Hazard Curves* ..HAZHEAD (A40)1 ...NHAZ15 .NPHAZ1.0 ..PWHAZ(I)0.001 0.002 0.005 0.01 0.02 0.03 0.050.07 0.1 0.2 0.3 0.5 1.0 1.52.01.15E-04 1.15E-04 1.15E-04 1.15E-04 1.15E-04 1.15E-04 1.15E-04I.I1E-04 1.02E-04 7.20E-05 5.22E-05 2.99E-05 9.54E-06 3.98E-061.95E-06Page 92 of 102 "EntergyENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Page 17SCDF I.BASSHIP Basic OutputNo. Damage State Damage State No. of Contributing Sequence RisksName Risk Sequences (in decreasing order of importance)

ALL 1.44E-05 2 No. Sequence Name Sequence Risk % of TotalI PIL-SEQ2 1.20E-05 83.342 PIL-SEQi 2.41E-06 16.66Sum: 1.44E-05 100.00Page 18SCDFI.BAS SHIP Basic OutputSummary of Plant Level Fragility Conditional Probability of Failure.050.150.250.500.750.850.950HCLPF (See note)PGA (g).401.470.495.572.685.754.889.326Note: Best Estimate Case HCLPFHCLPF = Ground motion level for which there is a highconfidence 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

=L-Entergy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency SHIP Evaluation

1. 9Names File for PILRUN 1.NAMPILRUN 1 .GENPILRUN 1 .SYSPILRUN 1 .CMPPILRUNI .SEQPILEPRI 1 .HAZPILRUN 1 .NAM05-24-11Basic Innut File for PILRUN1.GEN Pilgrim SPRABoston Edison CompanyLevel I PRARANOPO1 1 21 129 7 122 1 2PGA (g)1 .04 .01 0.98 12902PILRUN 1 .GEN5-24-11nsupcmp,ncomps,ncmpnln,nr,nsys,nseq,ndmg Page 94 of 102 SEnt&V ENG REPORT PN PS-RPT-I 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency Basic Event Data File for PILRUNI.CMP ESISLXXXXZ SISLEBAAXXXXXZ 2.11 0.46 0 0EBABD3XXXZ 2.28 0.46 0 0EBCD1145XZ 2.11 0.46 0 0EBCD12-13Z 2.28 0.46 0 0EBDDGBLDXZ 1.04 0.46 0 0EBSA5XXXXZ 1.76 0.46 0 0EBSA600XXZ 2.09 0.46 0 0EBSA6XXXXZ 2.09 0.46 0 0EBSA8XXXXZ 0.96 0.29 0.37 0EBSB10XXXZ 2.24 0.46 0 0EBSB1415XZ 1.51 0.46 0 0EBSB1718XZ 2 0.46 0 0EBSB1XXXXZ 2 0.46 0 0EBSB2XXXXZ 1.13 0.46 0 0EBSB6XXXXZ 2 0.46 0 0EBSD16XXXZ 2.11 0.46 0 0EBSD17XXXZ 2.28 0.46 0 0EBSD4XXXXZ 2.11 0.46 0 0EBSD5XXXXZ 2.28 0.46 0 0EBSD7XXXXZ 2 0.46 0 0EBSY34XXXZ 1.49 0.46 0 0EBW185/1XZ 1.41 0.46 0 0EBW195/23Z 2 0.46 0 0EBW198/OXZ 2.29 0.46 0 0EBW198/1XZ 3.43 0.33 0.72 0EBW198/2XZ 3.43 0.33 0.72 0EBW198/3XZ 2.29 0.46 0 0EBW209/OXZ 2 0.46 0 0EBW209/1XZ 1.72 0.46 0 0EBW21O/OXZ 1.65 0.34 0.46 0EBW210/1XZ 1.84 0.46 0 0EBW210/3XZ 2 0.46 0 0EBW45/3XXZ 2 0.46 0 0ECBD29XXXZ 2.23 0.46 0 0ECBD30-31Z 2.28 0.46 0 0ECMK103ABZ 1.73 0.46 0 0ECONTLRODZ 1.55 0.46 0 0ECOREPLATZ 2.9 0.46 0 0EDLGEABXXZ 1.39 0.32 0.57 0EDLGESBOXZ 2 0.46 0 0EDP2233ABZ 1.49 0.46 0 0EDPC2258XZ 2.13 0.46 0 0EDPC5XXXXZ 2.11 0.46 0 0EDPC6XXXXZ 2.11 0.46 0 0Page 95 of 102 iEntergyEDPC93023Z EDPC93912Z EDRYWSUPPZ EDWSHIELDZ EFN201ABXZ EFN202ABXZ EFN203ABXZ EFN204ABXZ EFN204CDXZ EFN207A-DZ EFNDWCOOLZ EFUAXXXXXZ EFUBXXXXXZ EFUD3XXXXZ EFUELCHANZ EINCORHOUZ EINTKPANLZ EISLOCACSZ EISLOCRHRZ ELOCAHPCIZ ELOCARCICZ EPM141ABXZ EPM1 84AXXZEPM202A-FZ EPM203A-DZ EPM208A-EZ EPTHPCIXXZ EPTRCICXXZ ERBTRKLOKZ ERE12759!Z ERE127692Z ERE132X9!Z ERE1425B!Z ERE15159!Z ERE1 5169!ZERE1 59X9!ZERE16059!Z ERE16069!Z ERE181592Z ERE18169!Z ERE1 865X!ZERE18681

!ZERE187592Z ERE18769!Z ERE18781!Z ERE2352X!Z ERE2759X!Z ERE27A5X!Z ERE27A6X!Z ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency 2.28 0.462.28 0.462.62 0.462.04 0.462 0.462 0.462 0.462 0.462 0.462 0.461.06 0.462.23 0.462.5 0.462.28 0.463.96 0.462.75 0.464.54 0.460 0.460 0.462.5 0.462.5 0.461.73 0.461.42 0.462.13 0.462.33 0.462.32 0.462.33 0.462.33 0.463.55 0.460.89 0.311.04 0.311.5 0.311.14 0.310.89 0.311.04 0.312.22 0.310.89 0.311.04 0.310.89 0.311.04 0.310.73 0.311.34 0.310.89 0.311.04 0.310.25 0.311.2 0.311.55 0.310.89 0.311.04 0.31000000000000000000000000000000.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.51Page 96 of 102 A -ENG REPORT PNPS-RPT-1 1-00001ýzEntergy Re-assessment of Pilgrim Seismic Core Damage Frequency ERE32801Z 1 0.31 0.51 0ERE40801

'Z 0.67 0.31 0.51 0ERE46801!Z 0.67 0.31 0.51 0ERE51N81!Z 1 0.31 0.51 0ERE51NG8!Z 1 0.31 0.51 0ERE51V81!Z 1 0.31 0.51 0ERE59801Z 1 0.31 0.51 0ERINGGIRDZ 2.54 0.46 0 0ERPVPEDESZ 3.27 0.46 0 0ERPVSTABLZ 1.52 0.46 0 0ERWCONCWLZ 1.93 0.46 0 0ERXBLDDWLZ 3.57 0.46 0 0ERXBLDFOUZ 1.76 0.46 0 0ESHDSPGUSZ 2.54 0.46 0 0ESURROGATZ 1 0.3 0 0ETBCONCWLZ 3.89 0.46 0 0ETK105ABNZ 5 0.46 0 0ETKT105ABZ 1.27 0.46 0 0ETKT124ABZ 4.81 0.65 0 0ETKT126ABZ 1.44 0.46 0 0ETKT201ABZ 2.1 0.46 0 0ETOPGUIDEZ 2.56 0.46 0 0ETVX21XXXZ 1.76 0.46 0 0ETVX22XXXZ 2.77 0.46 0 0ETVX55XXXZ 1.49 0.46 0 0EUPLOFLORZ 1.4 0.46 0 0EVA452122Z 2.9 0.46 0 0EVESUPSKTZ 6.15 0.46 0 0EVPEABXXXZ 1.73 0.46 0 0EVRCABXXXZ 1.73 0.46 0 0EVS4563ABZ 2.9 0.46 0 0EVS4563CDZ 2.9 0.46 0 0EVS4565CDZ 1.73 0.46 0 0EVS4582ABZ 2.9 0.46 0 0EVS4582CDZ 2.9 0.46 0 0ELOSPXXXXZ 0.35 0.55 0 0EBCD14XXXY 12 0.0000 21.0 0.0000 0.OOE+00EDLGESBOXY 12 0.0000 21.0 0.0000 0.OOE+00ELPSPPRPLY 12 0.0000 21.0 0.0000 0.OOE+00ESPCOOLXXY 12 0.0000 21.0 0.0000 0.OOE+00ESPC36ABXY 1Page 97 of 102 tEntergy2 0.00001.0 0.0000ERERESET!Y 2 0.00001.0 0.0000EVMMO45X!Y 2 0.00001.0 0.0000ACB152501F ACB1 52509LACB152601F ACB1 52609LACB1 52802FACB5605CCN ACB5609CCC ADLADL3CCR ADLADLBCCR ADLADLBCCS ADLBDL3CCR ADLG123CCR ADLGEAXXXS ADLGEAXXXU ADLGEBXXXR ADLGEBXXXU ADLGESBOXS ADLGESBOXU ALOCALOOP APM141AXXR APM141BXXR APM184AXXR APM184AXXS AVA452XCCN BPM5XXXCCS BPMBXXXXXU BPMCXXXXXU BPMEXXXXXU BPMFXXXXXU BVM3801XXC BVM3805XXC CMCVC9AXXXXC CVC9BXXXXC DBC21XXCCR DBCD11NORE DBCD1 1XXXUDBCD12NORE DBCD12XXXU EBCD1 1XXXREBCD12XXXR ENG REPORT PNPS-RPT-I 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency 20.OOE+00120.OOE+00120.OOE+000.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.001Page 98 of 102 AEntergyECB152504F ECB1 52505NECB152508L ECB152509C ECB1 52600LECB1 52604FECB1 52605NECB1 52608LECB1 52609CECB152801C ECB152802N ECB5605AXY ECB5605DXY EDLGEAXXXR EDLGEBXXXS EDLGESBOXR EHX209AXXU EHX209BXXU ELOCAHPCIR ELOCARCICR EPM141AXXS EPM141BXXS EPM208AXXS EPM208BXXS EPM208EXXS EPTHPCIXXR EPTRCICXXR EVA4521XXN EVA4522XXN EVM1330117C EVM23015XC HPMAUXOILS HPME205XXS HPTHPCIXXS HPTHPRCCCR HPTHPRCCCS HSYHPCIMNU HVMMO35XXN HVMMO36XXN HVMMO3XXXN HVMMO6XXXC HVMMO8XXXN ILPRCICMNU IPTRCICXXS IPWACPMPS IVMINJVCCN IVMMO49XXN IVMMO6OXXC IVMMO61XXN ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency 0.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.00E+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.0010.OOE+00 0.001Page 99 of 102 SEntergy ENG REPORT PN PS-RPT-I 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency IVMMO62XXN 0.OOE+00 0.001P 0.OOE+00 0.001RHXE207AXU 0.00E+00 0.001RHXE207BXU 0.00E+00 0.001RLPSPCOLAU 0.OOE+00 0.001RLPSPCOLBU 0.OOE+00 0.001RPMABCDCCS 0.OOE+00 0.001RVC68AXXXC 0.OOE+00 0.001RVC68BXXXC 0.OOE+00 0.001RVM10ABCCN 0.OOE+00 0.001RVM3436CCN 0.OOE+00 0.001RVM34ABCCN 0.OOE+00 0.001RVM34AXXXN 0.OOE+00 0.001RVM34BXXXN 0.OOE+00 0.001RVM36ABCCN 0.OOE+00 0.001RVM36AXXXN 0.OOE+00 0.001RVM36BXXXN 0.OOE+00 0.001RVM4A6BCCN 0.OOE+00 0.001RVM4B6ACCN 0.OOE+00 0.001RVM60ABCCN 0.OOE+00 0.001SPMABXXCCS 0.OOE+00 0.001SPMALLXCCS 0.OOE+00 0.001SPMP208BXU 0.OOE+00 0.001SPMP208EXU 0.OOE+00 0.001SVC3880BXN 0.OOE+00 0.001SVC3880EXN 0.OOE+00 0.001ETRANSFLAG 1.OOE+00 0.001RVM29AXXXL 0.OOE+00 0.001RVM29BXXXL 0.OOE+00 0.001EVM25BXXXL 0.OOE+00 0.001CVM25AXXXL 0.OOE+00 0.001JAF-INSERT 4.65E-03 0.001PILRUN1.CMP 5/18/2011 Page 100 of 102 t--Entergy ENG REPORT PNPS-RPT-1 1-00001Re-assessment of Pilgrim Seismic Core Damage Frequency System Data File for PILRUN 1 .SYS1 I CDFALLLMCDFSequence Data File: PILRUNI .SEOPIL-SEQI PIL-SEQII1 1ESURROGATZ PIL-SEQ2 T1 1 3\ESURROGATZ 9IL-SEQ2ELOSPXXXXZ CDFALLALLIHazard Data File: PILEPRII

.HAZ*Pilgrim Updated EPRI Hazard15Curves* ..HAZHEAD (A40)...NHAZ.NPHAZ..PWHAZ(I)0.02 0.03 0.050.5 1.0 1.51.00.0010.070.002 0.005 0.010.1 0.2 0.32.01.15E-04 1.15E-04 1.15E-04 1.15E-04 1.15E-04 1.15E-04 1.15E-041.1IE-04 1.02E-04 7.20E-05 5.22E-05 2.99E-05 9.54E-06 3.98E-061.95E-06Page 101 of 102

'=-EnterAY ENG REPORT PNPS-RPT-11-00001 Re-assessment of Pilgrim Seismic Core Damage Frequency Page 17RANOPO.BAS SHIP Basic OutputNo. Damage State Damage State No. of Contributing Sequence RisksName Risk Sequences (in decreasing order of importance)

ALL 8.97E-06 2 No. Sequence Name Sequence Risk % of TotalI PIL-SEQ2 6.57E-06 73.192 PIL-SEQI 2.41E-06 26.81Sum: 8.97E-06 100.00Page 18RANOPO.BAS SHIP Basic OutputSummary of Plant Level Fragility Conditional Probability of Failure.050.150.250.500750.850950HCLPF (See note)PGA (g).466.546.595.693.798.858.962.381Note: Best Estimate Case HCLPFHCLPF = Ground motion level for which there is a highconfidence 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