RS-15-286, High Frequency Supplement to Seismic Hazard Screening Report, Response to NRC Request for Information, Per 10CFR50.54(f) Regarding Recommendation 2.1 of the Near-Term Task Force Review of Insights from the Fukushima..: Difference between revisions

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{{#Wiki_filter:Exelon Generation RS-15-286 December 4, 2015 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk 11555 Rockville Pike, Rockville, MD 20852 Calvert Cliffs Nuclear Power Plant, Units 1 and 2 10 CFR 50.54(f) Renewed Facility Operating License Nos. DPR-53 and DPR-69 NRC Docket Nos. 50-317 and 50-318  
{{#Wiki_filter:Exelon Generation RS-15-286                                                                 10 CFR 50.54(f)
December 4, 2015 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk 11555 Rockville Pike, Rockville, MD 20852 Calvert Cliffs Nuclear Power Plant, Units 1 and 2 Renewed Facility Operating License Nos. DPR-53 and DPR-69 NRC Docket Nos. 50-317 and 50-318


==Subject:==
==Subject:==
High Frequency Supplement to Seismic Hazard Screening Report, Response to NRC Request for Information Pursuant to 1 O CFR 50.54(f) Regarding Recommendation 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident  
High Frequency Supplement to Seismic Hazard Screening Report, Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding Recommendation 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident


==References:==
==References:==
: 1. NRC Letter, Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(f) Regarding Recommendations 2.1, 2.3, and 9.3, of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident, dated March 12, 2012(ML12053A340)  
: 1. NRC Letter, Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(f) Regarding Recommendations 2.1, 2.3, and 9.3, of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident, dated March 12, 2012(ML12053A340)
: 2. NRC Letter, Electric Power Research Institute Report 3002000704, "Seismic Evaluation Guidance:
: 2. NRC Letter, Electric Power Research Institute Report 3002000704, "Seismic Evaluation Guidance: Augmented Approach for the Resolution of Fukushima Near-Term Task Force Recommendation 2.1: Seismic," As An Acceptable Alternative to the March 12, 2012, Information Request for Seismic Reevaluations, dated May 7, 2013 (ML13106A331)
Augmented Approach for the Resolution of Fukushima Near-Term Task Force Recommendation 2.1: Seismic," As An Acceptable Alternative to the March 12, 2012, Information Request for Seismic Reevaluations, dated May 7, 2013 (ML 13106A331)  
: 3. NEI Letter, Final Draft of Industry Seismic Evaluation Guidance (EPRI 1025287), dated November 27, 2012 (ML12333A168 and ML12333A170)
: 3. NEI Letter, Final Draft of Industry Seismic Evaluation Guidance (EPRI 1025287), dated November 27, 2012 (ML 12333A 168 and ML 12333A 170) 4. NRC Letter, Endorsement of Electric Power Research Institute Final Draft Report 1025287, "Seismic Evaluation Guidance" , dated February 15, 2013(ML12319A074)  
: 4. NRC Letter, Endorsement of Electric Power Research Institute Final Draft Report 1025287, "Seismic Evaluation Guidance", dated February 15, 2013(ML12319A074)
: 5. Constellation Energy Nuclear Group letter to NRC , Seismic Hazard and Screening Report (CEUS Sites), Response to NRC Request for Information Pursuant to 10CFR50.54(f)
: 5. Constellation Energy Nuclear Group letter to NRC, Seismic Hazard and Screening Report (CEUS Sites), Response to NRC Request for Information Pursuant to 10CFR50.54(f) Regarding Recommendation 2.1 of Near-Term Task Force Review of Insights from the Fukushima Dai-lchi Accident: Calvert Cliffs Nuclear Power Plant, Units 1 and 2, dated March 31, 2014(ML14099A196)
Regarding Recommendation 2.1 of Near-Term Task Force Review of Insights from the Fukushima Dai-lchi Accident:
: 6. NRC Letter, Screening and Prioritization Results Regarding Information Pursuant to Title 1O of the Code of Federal Regulations 50.54(f) Regarding Seismic Hazard Re-evaluations for Recommendation 2.1 of the Near Term Task Force Review of Insights from the Fukushima Dai-lchi Accident, dated May 9, 2014(ML14111A147)
Calvert Cliffs Nuclear Power Plant, Units 1 and 2 , dated March 31, 2014(ML14099A 196) 6. NRC Letter , Screening and Prioritization Results Regarding Information Pursuant to Title 1 O of the Code of Federal Regulations 50.54(f) Regarding Seismic Hazard evaluations for Recommendation 2.1 of the Near Term Task Force Review of Insights from the Fukushima Dai-lchi Accid e nt , dat e d May 9, 2014(M L 14111A147)
 
U.S. Nuclear Regulatory Commission Seismic Hazard 2.1 High Frequency Supplement December 4, 2015 Page 2 7. NRC Letter, Support Document for Screening and Prioritization Results Regarding Seismic Hazard Re-Evaluation for Operating Reactors in the Central and Eastern United States, dated May 21, 2014 (ML 14136A 126) 8. NEI Letter, Request for NRC Endorsement of High Frequency Program: Application Guidance for Functional Confirmation and Fragility Evaluation (EPRI 3002004396), dated July 30, 2015 (ML 15223A 100/ML 15223A 102) 9. NRC Letter, September 17, 2015 to NEI: Endorsement of Electric Power Research Institute Final Draft Report 3002004396: "High Frequency Program: Application Guidance for Functional Confirmation and Fragility" (ML 15218A569)  
U.S. Nuclear Regulatory Commission Seismic Hazard 2.1 High Frequency Supplement December 4, 2015 Page 2
: 10. NRC Letter, Final Determination of Licensee Seismic Probabilistic Risk Assessments Under the Request for Information Pursuant to Title 1 O of the Code of Federal Regulations 50.54(f) Regarding Recommendation 2.1 "Seismic" of the Near-Term Task Force Review of Insights from the Fukushima Dai-lchi Accident, dated October 27, 2015 (ML 15194A015)
: 7. NRC Letter, Support Document for Screening and Prioritization Results Regarding Seismic Hazard Re-Evaluation for Operating Reactors in the Central and Eastern United States, dated May 21, 2014 (ML14136A126)
On March 12, 2012, the Nuclear Regulatory Commission (NRC) issued a Request for Information per 10 CFR 50.54(f) (Reference  
: 8. NEI Letter, Request for NRC Endorsement of High Frequency Program: Application Guidance for Functional Confirmation and Fragility Evaluation (EPRI 3002004396),
: 1) to all power reactor licensees.
dated July 30, 2015 (ML15223A100/ML15223A102)
The required response section of Enclosure 1 of Reference 1 indicated that licensees should provide a Seismic Hazard Evaluation and Screening Report within 1.5 years from the date of the letter for Central and Eastern United States (CEUS) nuclear power plants. By NRC letter dated May 7, 2013 (Reference 2), the date to submit the report was extended to March 31, 2014. By letter dated May 9, 2014 (Reference 6), the NRC transmitted the results of the screening and prioritization review of the seismic hazards reevaluation submittal for Calvert Cliffs Nuclear Power Plant, Units 1 and 2 (Reference 5). In accordance with the screening, prioritization, and implementation details report (SPID) (References 3 and 4), and Augmented Approach guidance (as endorsed in Reference 2), the reevaluated seismic hazard is used to determine if additional seismic risk evaluations are warranted for a plant. Specifically, the reevaluated horizontal ground motion response spectrum (GMRS) at the control point elevation is compared to the existing safe shutdown earthquake (SSE) or Individual Plant Examination for External Events (IPEEE) High Confidence of Low Probability of Failure (HCLPF) Spectrum (IHS) to determine if a plant is required to perform a high frequency confirmation evaluation.
: 9. NRC Letter, September 17, 2015 to NEI: Endorsement of Electric Power Research Institute Final Draft Report 3002004396: "High Frequency Program: Application Guidance for Functional Confirmation and Fragility" (ML15218A569)
As noted in the May 9, 2014 letter from the NRC (Reference  
: 10. NRC Letter, Final Determination of Licensee Seismic Probabilistic Risk Assessments Under the Request for Information Pursuant to Title 1O of the Code of Federal Regulations 50.54(f) Regarding Recommendation 2.1 "Seismic" of the Near-Term Task Force Review of Insights from the Fukushima Dai-lchi Accident, dated October 27, 2015 (ML15194A015)
: 6) on page 2 of Enclosure 2, Calvert Cliffs Nuclear Power Plant, Units 1 and 2 is to conduct a limited scope High Frequency Evaluation (Confirmation).
On March 12, 2012, the Nuclear Regulatory Commission (NRC) issued a Request for Information per 10 CFR 50.54(f) (Reference 1) to all power reactor licensees. The required response section of Enclosure 1 of Reference 1 indicated that licensees should provide a Seismic Hazard Evaluation and Screening Report within 1.5 years from the date of the letter for Central and Eastern United States (CEUS) nuclear power plants. By NRC letter dated May 7, 2013 (Reference 2), the date to submit the report was extended to March 31, 2014.
Within the May 9, 2014 letter (Reference 6), the NRC acknowledged that these limited scope evaluations will require additional development of the assessment process. By Reference 8, the Nuclear Energy Institute (NEI) submitted an Electric Power Research Institute (EPRI) report entitled, High Frequency Program: Application Guidance for Functional Confirmation and Fragility Evaluation (EPRI 3002004396) for NRC review and endorsement.
By letter dated May 9, 2014 (Reference 6), the NRC transmitted the results of the screening and prioritization review of the seismic hazards reevaluation submittal for Calvert Cliffs Nuclear Power Plant, Units 1 and 2 (Reference 5). In accordance with the screening, prioritization, and implementation details report (SPID) (References 3 and 4), and Augmented Approach guidance (as endorsed in Reference 2), the reevaluated seismic hazard is used to determine if additional seismic risk evaluations are warranted for a plant. Specifically, the reevaluated horizontal ground motion response spectrum (GMRS) at the control point elevation is compared to the existing safe shutdown earthquake (SSE) or Individual Plant Examination for External Events (IPEEE) High Confidence of Low Probability of Failure (HCLPF) Spectrum (IHS) to determine if a plant is required to perform a high frequency confirmation evaluation. As noted in the May 9, 2014 letter from the NRC (Reference 6) on page 2 of Enclosure 2, Calvert Cliffs Nuclear Power Plant, Units 1 and 2 is to conduct a limited scope High Frequency Evaluation (Confirmation).
NRC endorsement was provided by Reference  
Within the May 9, 2014 letter (Reference 6), the NRC acknowledged that these limited scope evaluations will require additional development of the assessment process. By Reference 8, the Nuclear Energy Institute (NEI) submitted an Electric Power Research Institute (EPRI) report entitled, High Frequency Program: Application Guidance for Functional Confirmation and Fragility Evaluation (EPRI 3002004396) for NRC review and endorsement. NRC endorsement was provided by Reference 9. Reference 1O provided the NRC final seismic hazard evaluation screening determination results and the associated schedules for submittal of the remaining seismic hazard evaluation activities. This submittal is provided in accordance with Reference 1O, Table 1a, to address the High Frequency Evaluation information request for Calvert Cliffs Nuclear Power Plant, Units 1 and 2.
: 9. Reference 1 O provided the NRC final seismic hazard evaluation screening determination results and the associated schedules for submittal of the remaining seismic hazard evaluation activities.
 
This submittal is provided in accordance with Reference 1 O, Table 1 a, to address the High Frequency Evaluation information request for Calvert Cliffs Nuclear Power Plant, Units 1 and 2.
U.S. Nuclear Regulatory Commission Seismic Hazard 2.1 High Frequency Supplement December 4, 2015 Page 3 The High Frequency Confirmation for Calvert Cliffs Nuclear Power Plant Units 1 & 2 shows that the high-frequency spectral accelerations of the control point GMRS above 1OHz are within the limits identified in Section 3.1.1 of Reference 8 (less than or equal to 0.2g); therefore, no additional evaluation is necessary. The attachment to this letter provides the SSE and GMRS information from Reference 5.
U.S. Nuclear Regulatory Commission Seismic Hazard 2.1 High Frequency Supplement December 4, 2015 Page 3 The High Frequency Confirmation for Calvert Cliffs Nuclear Power Plant Units 1 & 2 shows that the high-frequency spectral accelerations of the control point GMRS above 1 OHz are within the limits identified in Section 3.1.1 of Reference 8 (less than or equal to 0.2g); therefore, no additional evaluation is necessary.
This transmittal completes the scope of work described in Section 4.2 of Reference 5, for Calvert Cliffs Nuclear Power Plant, Units 1 and 2.
The attachment to this letter provides the SSE and GMRS information from Reference  
This letter contains no new regulatory commitments and closes the associated regulatory commitment contained in Reference 5 for Calvert Cliffs Nuclear Power Plant, Units 1 and 2.
: 5. This transmittal completes the scope of work described in Section 4.2 of Reference 5, for Calvert Cliffs Nuclear Power Plant, Units 1 and 2. This letter contains no new regulatory commitments and closes the associated regulatory commitment contained in Reference 5 for Calvert Cliffs Nuclear Power Plant, Units 1 and 2. If you have any questions regarding this report, please contact Ronald Gaston at 630-657-3359.
If you have any questions regarding this report, please contact Ronald Gaston at 630-657-3359.
I declare under penalty of perjury that the foregoing is true and correct. Executed on the 4th day of December 2015. James Barstow Director -Licensing  
I declare under penalty of perjury that the foregoing is true and correct. Executed on the 4th day of December 2015.
& Regulatory Affairs Exelon Generation Company, LLC  
Res~tt::mk-James Barstow Director - Licensing & Regulatory Affairs Exelon Generation Company, LLC


==Attachment:==
==Attachment:==
Calvert Cliffs Nuclear Power Plant, Units 1 and 2 GMRS and SSE Supporting Information cc:    Regional Administrator - NRC Region I NRC Senior Resident Inspector- Calvert Cliffs Nuclear Power Plant NRC Project Manager, NRR - Calvert Cliffs Nuclear Power Plant Mr. Nicholas DiFrancesco, NRR/JLD/JHMB, NRC


Calvert Cliffs Nuclear Power Plant, Units 1 and 2 GMRS and SSE Supporting Information cc: Regional Administrator
Attachment Calvert Cliffs Nuclear Power Plant, Units 1 and 2 GMRS and SSE Supporting Information (Reference 5)
-NRC Region I NRC Senior Resident Inspector-Calvert Cliffs Nuclear Power Plant NRC Project Manager, NRR -Calvert Cliffs Nuclear Power Plant Mr. Nicholas DiFrancesco, NRR/JLD/JHMB, NRC Attachment Calvert Cliffs Nuclear Power Plant, Units 1 and 2 GMRS and SSE Supporting Information (Reference  
(2 Pages)
: 5) (2 Pages)
 
Table 1 -Calvert Cliffs Nuclear Power Plant Units 1 & 2 SSE and GMRS data SSE GMRS Freq Acee I Freq Acee I (Hz) (g) (Hz) (g) 0.1 0.008 0.1 0.0114 0.12S 0.012 0.12S 0.0142 O.lS 0.018 O.lS 0.0170 0.2 0.029 0.2 0.0227 0.2S 0.041 0.2S 0.0284 0.3 0.049 0.3 0.0341 0.3S O.OS7 0.3S 0.0398 0.4 0.063 0.4 0.04S4 o.s 0.074 o.s O.OS68 0.6 0.08S 0.6 0.06SO 0.7 0.09S 0.7 0.079S 0.8 0.104 0.8 0.0827 0.9 0.112 0.9 0.0870 1 0.123 1 0.0970 1.2S 0.14S 1.2S 0.117 1.S 0.166 1.S 0.128 2 0.198 2 0.143 2.S 0.217 2.5 0.148 3 0.226 3 0.164 3.S 0.226 3.S 0.176 4 0.222 4 0.18S s 0.212 s 0.200 6 0.197 6 0.203 7 0.188 7 0.204 8 0.179 8 0.200 9 0.168 9 0.194 10 0.160 10 0.188 12.S 0.1S2 12.S 0.188 lS 0.1S2 lS 0.182 20 0.1S2 20 0.180 2S 0.1S1 2S 0.18S 30 0.1S1 30 0.168 3S 0.1S1 3S 0.1S7 40 O.lSO 40 0.149 so O.lSO so 0.138 60 O.lSO 60 0.130 70 O.lSO 70 0.124 80 O.lSO 80 0.119 90 O.lSO 90 0.11S 100 O.lSO 100 0.112 Page 1of2 0.5 0.45 0.4 0.35 bl) c 0.3 .g I! 0.25 cu Qj u u ct 0.2 0.15 0.1 0.05 0 Figure 1 Calvert Cliffs Nuclear Power Plant Units 1 & 2 GMRS to SSE Comparison  
Table 1 - Calvert Cliffs Nuclear Power Plant Units 1 & 2 SSE and GMRS data SSE               GMRS Freq     Acee I   Freq     Acee I (Hz)       (g)     (Hz)     (g) 0.1     0.008     0.1   0.0114 0.12S     0.012   0.12S   0.0142 O.lS     0.018     O.lS   0.0170 0.2     0.029     0.2   0.0227 0.2S     0.041     0.2S   0.0284 0.3     0.049     0.3   0.0341 0.3S     O.OS7     0.3S   0.0398 0.4     0.063     0.4   0.04S4 o.s     0.074     o.s   O.OS68 0.6     0.08S     0.6   0.06SO 0.7     0.09S     0.7   0.079S 0.8     0.104     0.8   0.0827 0.9     0.112     0.9   0.0870 1     0.123       1   0.0970 1.2S     0.14S     1.2S     0.117 1.S     0.166     1.S     0.128 2     0.198       2     0.143 2.S     0.217     2.5     0.148 3     0.226       3     0.164 3.S     0.226     3.S     0.176 4     0.222       4     0.18S s     0.212       s     0.200 6     0.197       6     0.203 7     0.188       7     0.204 8     0.179       8     0.200 9     0.168       9     0.194 10     0.160     10     0.188 12.S     0.1S2     12.S     0.188 lS     0.1S2       lS     0.182 20     0.1S2     20     0.180 2S     0.1S1       2S     0.18S 30       0.1S1     30     0.168 3S       0.1S1     3S     0.1S7 40       O.lSO     40     0.149 so     O.lSO     so     0.138 60     O.lSO     60     0.130 70     O.lSO       70     0.124 80     O.lSO     80     0.119 90     O.lSO     90     0.11S 100     O.lSO     100     0.112 Page 1of2
'----------r-
 
,...-'----+----+------
Figure 1 Calvert Cliffs Nuclear Power Plant Units 1 & 2 GMRS to SSE Comparison 0.5 0.45  -!-------~                                                          '----------r-0.4                                                ,...-'----+----+------
-----:-
0.35                                                                              - - - - -:-
,..---J----*-_L...,
bl) c    0.3                                                                                                - SSE
_____ ,,,_ __ _ .>c ...._ __J __ 1 I ff --=-'-1' 0.1 1 Frequency (Hz) 10 100 Page 2of2 -SSE -GMRS Exelon Generation RS-15-286 December 4, 2015 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk 11555 Rockville Pike, Rockville, MD 20852 Calvert Cliffs Nuclear Power Plant, Units 1 and 2 10 CFR 50.54(f) Renewed Facility Operating License Nos. DPR-53 and DPR-69 NRC Docket Nos. 50-317 and 50-318  
.g I!
cu        -+-------.~
                                                                                                        -  GMRS 0.25                                                                          ,..---J----*-_L...,
Qj u
u ct 0.2
                          ---.~__,,.______,,,____    .> c     ...._                         __J_ _1 0.15                          I   ff   --=-'-
0.1                        1' 0.05 0
0.1                     1                                   10                            100 Frequency (Hz)
Page 2of2
 
Exelon Generation RS-15-286                                                                 10 CFR 50.54(f)
December 4, 2015 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk 11555 Rockville Pike, Rockville, MD 20852 Calvert Cliffs Nuclear Power Plant, Units 1 and 2 Renewed Facility Operating License Nos. DPR-53 and DPR-69 NRC Docket Nos. 50-317 and 50-318


==Subject:==
==Subject:==
High Frequency Supplement to Seismic Hazard Screening Report, Response to NRC Request for Information Pursuant to 1 O CFR 50.54(f) Regarding Recommendation 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident  
High Frequency Supplement to Seismic Hazard Screening Report, Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding Recommendation 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident


==References:==
==References:==
: 1. NRC Letter, Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(f) Regarding Recommendations 2.1, 2.3, and 9.3, of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident, dated March 12, 2012(ML12053A340)  
: 1. NRC Letter, Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(f) Regarding Recommendations 2.1, 2.3, and 9.3, of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident, dated March 12, 2012(ML12053A340)
: 2. NRC Letter, Electric Power Research Institute Report 3002000704, "Seismic Evaluation Guidance:
: 2. NRC Letter, Electric Power Research Institute Report 3002000704, "Seismic Evaluation Guidance: Augmented Approach for the Resolution of Fukushima Near-Term Task Force Recommendation 2.1: Seismic," As An Acceptable Alternative to the March 12, 2012, Information Request for Seismic Reevaluations, dated May 7, 2013 (ML13106A331)
Augmented Approach for the Resolution of Fukushima Near-Term Task Force Recommendation 2.1: Seismic," As An Acceptable Alternative to the March 12, 2012, Information Request for Seismic Reevaluations, dated May 7, 2013 (ML 13106A331)  
: 3. NEI Letter, Final Draft of Industry Seismic Evaluation Guidance (EPRI 1025287), dated November 27, 2012 (ML12333A168 and ML12333A170)
: 3. NEI Letter, Final Draft of Industry Seismic Evaluation Guidance (EPRI 1025287), dated November 27, 2012 (ML 12333A 168 and ML 12333A 170) 4. NRC Letter, Endorsement of Electric Power Research Institute Final Draft Report 1025287, "Seismic Evaluation Guidance" , dated February 15, 2013(ML12319A074)  
: 4. NRC Letter, Endorsement of Electric Power Research Institute Final Draft Report 1025287, "Seismic Evaluation Guidance", dated February 15, 2013(ML12319A074)
: 5. Constellation Energy Nuclear Group letter to NRC , Seismic Hazard and Screening Report (CEUS Sites), Response to NRC Request for Information Pursuant to 10CFR50.54(f)
: 5. Constellation Energy Nuclear Group letter to NRC, Seismic Hazard and Screening Report (CEUS Sites), Response to NRC Request for Information Pursuant to 10CFR50.54(f) Regarding Recommendation 2.1 of Near-Term Task Force Review of Insights from the Fukushima Dai-lchi Accident: Calvert Cliffs Nuclear Power Plant, Units 1 and 2, dated March 31, 2014(ML14099A196)
Regarding Recommendation 2.1 of Near-Term Task Force Review of Insights from the Fukushima Dai-lchi Accident:
: 6. NRC Letter, Screening and Prioritization Results Regarding Information Pursuant to Title 1O of the Code of Federal Regulations 50.54(f) Regarding Seismic Hazard Re-evaluations for Recommendation 2.1 of the Near Term Task Force Review of Insights from the Fukushima Dai-lchi Accident, dated May 9, 2014(ML14111A147)
Calvert Cliffs Nuclear Power Plant, Units 1 and 2 , dated March 31, 2014(ML14099A 196) 6. NRC Letter , Screening and Prioritization Results Regarding Information Pursuant to Title 1 O of the Code of Federal Regulations 50.54(f) Regarding Seismic Hazard evaluations for Recommendation 2.1 of the Near Term Task Force Review of Insights from the Fukushima Dai-lchi Accid e nt , dat e d May 9, 2014(M L 14111A147)
 
U.S. Nuclear Regulatory Commission Seismic Hazard 2.1 High Frequency Supplement December 4, 2015 Page 2 7. NRC Letter, Support Document for Screening and Prioritization Results Regarding Seismic Hazard Re-Evaluation for Operating Reactors in the Central and Eastern United States, dated May 21, 2014 (ML 14136A 126) 8. NEI Letter, Request for NRC Endorsement of High Frequency Program: Application Guidance for Functional Confirmation and Fragility Evaluation (EPRI 3002004396), dated July 30, 2015 (ML 15223A 100/ML 15223A 102) 9. NRC Letter, September 17, 2015 to NEI: Endorsement of Electric Power Research Institute Final Draft Report 3002004396: "High Frequency Program: Application Guidance for Functional Confirmation and Fragility" (ML 15218A569)  
U.S. Nuclear Regulatory Commission Seismic Hazard 2.1 High Frequency Supplement December 4, 2015 Page 2
: 10. NRC Letter, Final Determination of Licensee Seismic Probabilistic Risk Assessments Under the Request for Information Pursuant to Title 1 O of the Code of Federal Regulations 50.54(f) Regarding Recommendation 2.1 "Seismic" of the Near-Term Task Force Review of Insights from the Fukushima Dai-lchi Accident, dated October 27, 2015 (ML 15194A015)
: 7. NRC Letter, Support Document for Screening and Prioritization Results Regarding Seismic Hazard Re-Evaluation for Operating Reactors in the Central and Eastern United States, dated May 21, 2014 (ML14136A126)
On March 12, 2012, the Nuclear Regulatory Commission (NRC) issued a Request for Information per 10 CFR 50.54(f) (Reference  
: 8. NEI Letter, Request for NRC Endorsement of High Frequency Program: Application Guidance for Functional Confirmation and Fragility Evaluation (EPRI 3002004396),
: 1) to all power reactor licensees.
dated July 30, 2015 (ML15223A100/ML15223A102)
The required response section of Enclosure 1 of Reference 1 indicated that licensees should provide a Seismic Hazard Evaluation and Screening Report within 1.5 years from the date of the letter for Central and Eastern United States (CEUS) nuclear power plants. By NRC letter dated May 7, 2013 (Reference 2), the date to submit the report was extended to March 31, 2014. By letter dated May 9, 2014 (Reference 6), the NRC transmitted the results of the screening and prioritization review of the seismic hazards reevaluation submittal for Calvert Cliffs Nuclear Power Plant, Units 1 and 2 (Reference 5). In accordance with the screening, prioritization, and implementation details report (SPID) (References 3 and 4), and Augmented Approach guidance (as endorsed in Reference 2), the reevaluated seismic hazard is used to determine if additional seismic risk evaluations are warranted for a plant. Specifically, the reevaluated horizontal ground motion response spectrum (GMRS) at the control point elevation is compared to the existing safe shutdown earthquake (SSE) or Individual Plant Examination for External Events (IPEEE) High Confidence of Low Probability of Failure (HCLPF) Spectrum (IHS) to determine if a plant is required to perform a high frequency confirmation evaluation.
: 9. NRC Letter, September 17, 2015 to NEI: Endorsement of Electric Power Research Institute Final Draft Report 3002004396: "High Frequency Program: Application Guidance for Functional Confirmation and Fragility" (ML15218A569)
As noted in the May 9, 2014 letter from the NRC (Reference  
: 10. NRC Letter, Final Determination of Licensee Seismic Probabilistic Risk Assessments Under the Request for Information Pursuant to Title 1O of the Code of Federal Regulations 50.54(f) Regarding Recommendation 2.1 "Seismic" of the Near-Term Task Force Review of Insights from the Fukushima Dai-lchi Accident, dated October 27, 2015 (ML15194A015)
: 6) on page 2 of Enclosure 2, Calvert Cliffs Nuclear Power Plant, Units 1 and 2 is to conduct a limited scope High Frequency Evaluation (Confirmation).
On March 12, 2012, the Nuclear Regulatory Commission (NRC) issued a Request for Information per 10 CFR 50.54(f) (Reference 1) to all power reactor licensees. The required response section of Enclosure 1 of Reference 1 indicated that licensees should provide a Seismic Hazard Evaluation and Screening Report within 1.5 years from the date of the letter for Central and Eastern United States (CEUS) nuclear power plants. By NRC letter dated May 7, 2013 (Reference 2), the date to submit the report was extended to March 31, 2014.
Within the May 9, 2014 letter (Reference 6), the NRC acknowledged that these limited scope evaluations will require additional development of the assessment process. By Reference 8, the Nuclear Energy Institute (NEI) submitted an Electric Power Research Institute (EPRI) report entitled, High Frequency Program: Application Guidance for Functional Confirmation and Fragility Evaluation (EPRI 3002004396) for NRC review and endorsement.
By letter dated May 9, 2014 (Reference 6), the NRC transmitted the results of the screening and prioritization review of the seismic hazards reevaluation submittal for Calvert Cliffs Nuclear Power Plant, Units 1 and 2 (Reference 5). In accordance with the screening, prioritization, and implementation details report (SPID) (References 3 and 4), and Augmented Approach guidance (as endorsed in Reference 2), the reevaluated seismic hazard is used to determine if additional seismic risk evaluations are warranted for a plant. Specifically, the reevaluated horizontal ground motion response spectrum (GMRS) at the control point elevation is compared to the existing safe shutdown earthquake (SSE) or Individual Plant Examination for External Events (IPEEE) High Confidence of Low Probability of Failure (HCLPF) Spectrum (IHS) to determine if a plant is required to perform a high frequency confirmation evaluation. As noted in the May 9, 2014 letter from the NRC (Reference 6) on page 2 of Enclosure 2, Calvert Cliffs Nuclear Power Plant, Units 1 and 2 is to conduct a limited scope High Frequency Evaluation (Confirmation).
NRC endorsement was provided by Reference  
Within the May 9, 2014 letter (Reference 6), the NRC acknowledged that these limited scope evaluations will require additional development of the assessment process. By Reference 8, the Nuclear Energy Institute (NEI) submitted an Electric Power Research Institute (EPRI) report entitled, High Frequency Program: Application Guidance for Functional Confirmation and Fragility Evaluation (EPRI 3002004396) for NRC review and endorsement. NRC endorsement was provided by Reference 9. Reference 1O provided the NRC final seismic hazard evaluation screening determination results and the associated schedules for submittal of the remaining seismic hazard evaluation activities. This submittal is provided in accordance with Reference 1O, Table 1a, to address the High Frequency Evaluation information request for Calvert Cliffs Nuclear Power Plant, Units 1 and 2.
: 9. Reference 1 O provided the NRC final seismic hazard evaluation screening determination results and the associated schedules for submittal of the remaining seismic hazard evaluation activities.
 
This submittal is provided in accordance with Reference 1 O, Table 1 a, to address the High Frequency Evaluation information request for Calvert Cliffs Nuclear Power Plant, Units 1 and 2.
U.S. Nuclear Regulatory Commission Seismic Hazard 2.1 High Frequency Supplement December 4, 2015 Page 3 The High Frequency Confirmation for Calvert Cliffs Nuclear Power Plant Units 1 & 2 shows that the high-frequency spectral accelerations of the control point GMRS above 1OHz are within the limits identified in Section 3.1.1 of Reference 8 (less than or equal to 0.2g); therefore, no additional evaluation is necessary. The attachment to this letter provides the SSE and GMRS information from Reference 5.
U.S. Nuclear Regulatory Commission Seismic Hazard 2.1 High Frequency Supplement December 4, 2015 Page 3 The High Frequency Confirmation for Calvert Cliffs Nuclear Power Plant Units 1 & 2 shows that the high-frequency spectral accelerations of the control point GMRS above 1 OHz are within the limits identified in Section 3.1.1 of Reference 8 (less than or equal to 0.2g); therefore, no additional evaluation is necessary.
This transmittal completes the scope of work described in Section 4.2 of Reference 5, for Calvert Cliffs Nuclear Power Plant, Units 1 and 2.
The attachment to this letter provides the SSE and GMRS information from Reference  
This letter contains no new regulatory commitments and closes the associated regulatory commitment contained in Reference 5 for Calvert Cliffs Nuclear Power Plant, Units 1 and 2.
: 5. This transmittal completes the scope of work described in Section 4.2 of Reference 5, for Calvert Cliffs Nuclear Power Plant, Units 1 and 2. This letter contains no new regulatory commitments and closes the associated regulatory commitment contained in Reference 5 for Calvert Cliffs Nuclear Power Plant, Units 1 and 2. If you have any questions regarding this report, please contact Ronald Gaston at 630-657-3359.
If you have any questions regarding this report, please contact Ronald Gaston at 630-657-3359.
I declare under penalty of perjury that the foregoing is true and correct. Executed on the 4th day of December 2015. James Barstow Director -Licensing  
I declare under penalty of perjury that the foregoing is true and correct. Executed on the 4th day of December 2015.
& Regulatory Affairs Exelon Generation Company, LLC  
Res~tt::mk-James Barstow Director - Licensing & Regulatory Affairs Exelon Generation Company, LLC


==Attachment:==
==Attachment:==
Calvert Cliffs Nuclear Power Plant, Units 1 and 2 GMRS and SSE Supporting Information cc:    Regional Administrator - NRC Region I NRC Senior Resident Inspector- Calvert Cliffs Nuclear Power Plant NRC Project Manager, NRR - Calvert Cliffs Nuclear Power Plant Mr. Nicholas DiFrancesco, NRR/JLD/JHMB, NRC
Attachment Calvert Cliffs Nuclear Power Plant, Units 1 and 2 GMRS and SSE Supporting Information (Reference 5)
(2 Pages)
Table 1 - Calvert Cliffs Nuclear Power Plant Units 1 & 2 SSE and GMRS data SSE                GMRS Freq      Acee I    Freq    Acee I (Hz)      (g)      (Hz)      (g) 0.1      0.008      0.1    0.0114 0.12S      0.012    0.12S    0.0142 O.lS      0.018    O.lS    0.0170 0.2      0.029      0.2    0.0227 0.2S      0.041    0.2S    0.0284 0.3      0.049      0.3    0.0341 0.3S      O.OS7    0.3S    0.0398 0.4      0.063      0.4    0.04S4 o.s      0.074      o.s    O.OS68 0.6      0.08S      0.6    0.06SO 0.7      0.09S      0.7    0.079S 0.8      0.104      0.8    0.0827 0.9      0.112      0.9    0.0870 1      0.123        1    0.0970 1.2S      0.14S    1.2S    0.117 1.S      0.166      1.S    0.128 2      0.198        2    0.143 2.S      0.217      2.5    0.148 3      0.226        3    0.164 3.S      0.226      3.S    0.176 4      0.222      4      0.18S s      0.212        s    0.200 6      0.197        6    0.203 7      0.188        7    0.204 8      0.179        8    0.200 9      0.168        9    0.194 10      0.160      10      0.188 12.S      0.1S2    12.S    0.188 lS      0.1S2      lS    0.182 20      0.1S2      20      0.180 2S      0.1S1      2S    0.18S 30      0.1S1      30      0.168 3S      0.1S1      3S      0.1S7 40      O.lSO      40      0.149 so      O.lSO      so      0.138 60      O.lSO      60      0.130 70      O.lSO      70    0.124 80      O.lSO      80      0.119 90      O.lSO      90      0.11S 100      O.lSO      100    0.112 Page 1of2


Calvert Cliffs Nuclear Power Plant, Units 1 and 2 GMRS and SSE Supporting Information cc: Regional Administrator
Figure 1 Calvert Cliffs Nuclear Power Plant Units 1 & 2 GMRS to SSE Comparison 0.5 0.45 -!-------~                                                          '----------r-0.4                                                ,...-'----+----+------
-NRC Region I NRC Senior Resident Inspector-Calvert Cliffs Nuclear Power Plant NRC Project Manager, NRR -Calvert Cliffs Nuclear Power Plant Mr. Nicholas DiFrancesco, NRR/JLD/JHMB, NRC Attachment Calvert Cliffs Nuclear Power Plant, Units 1 and 2 GMRS and SSE Supporting Information (Reference
0.35                                                                              - - - - -:-
: 5) (2 Pages)
bl) c    0.3                                                                                                - SSE
Table 1 -Calvert Cliffs Nuclear Power Plant Units 1 & 2 SSE and GMRS data SSE GMRS Freq Acee I Freq Acee I (Hz) (g) (Hz) (g) 0.1 0.008 0.1 0.0114 0.12S 0.012 0.12S 0.0142 O.lS 0.018 O.lS 0.0170 0.2 0.029 0.2 0.0227 0.2S 0.041 0.2S 0.0284 0.3 0.049 0.3 0.0341 0.3S O.OS7 0.3S 0.0398 0.4 0.063 0.4 0.04S4 o.s 0.074 o.s O.OS68 0.6 0.08S 0.6 0.06SO 0.7 0.09S 0.7 0.079S 0.8 0.104 0.8 0.0827 0.9 0.112 0.9 0.0870 1 0.123 1 0.0970 1.2S 0.14S 1.2S 0.117 1.S 0.166 1.S 0.128 2 0.198 2 0.143 2.S 0.217 2.5 0.148 3 0.226 3 0.164 3.S 0.226 3.S 0.176 4 0.222 4 0.18S s 0.212 s 0.200 6 0.197 6 0.203 7 0.188 7 0.204 8 0.179 8 0.200 9 0.168 9 0.194 10 0.160 10 0.188 12.S 0.1S2 12.S 0.188 lS 0.1S2 lS 0.182 20 0.1S2 20 0.180 2S 0.1S1 2S 0.18S 30 0.1S1 30 0.168 3S 0.1S1 3S 0.1S7 40 O.lSO 40 0.149 so O.lSO so 0.138 60 O.lSO 60 0.130 70 O.lSO 70 0.124 80 O.lSO 80 0.119 90 O.lSO 90 0.11S 100 O.lSO 100 0.112 Page 1of2 0.5 0.45 0.4 0.35 bl) c 0.3 .g I! 0.25 cu Qj u u ct 0.2 0.15 0.1 0.05 0 Figure 1 Calvert Cliffs Nuclear Power Plant Units 1 & 2 GMRS to SSE Comparison
.g I!
'----------r-
cu        -+-------.~
,...-'----+----+------
                                                                                                        -  GMRS 0.25                                                                          ,..---J----*-_L...,
-----:-
Qj u
,..---J----*-_L...,
u ct 0.2
_____ ,,,_ __ _ .>c ...._ __J __ 1 I ff --=-'-1' 0.1 1 Frequency (Hz) 10 100 Page 2of2 -SSE -GMRS}}
                          ---.~__,,.______,,,____    .> c     ...._                         __J_ _1 0.15                          I   ff   --=-'-
0.1                        1' 0.05 0
0.1                     1                                   10                            100 Frequency (Hz)
Page 2of2}}

Latest revision as of 08:05, 5 February 2020

High Frequency Supplement to Seismic Hazard Screening Report, Response to NRC Request for Information, Per 10CFR50.54(f) Regarding Recommendation 2.1 of the Near-Term Task Force Review of Insights from the Fukushima..
ML15338A002
Person / Time
Site: Calvert Cliffs  Constellation icon.png
Issue date: 12/04/2015
From: Jim Barstow
Exelon Generation Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
RS-15-286
Download: ML15338A002 (6)
v • d • e


Text

Exelon Generation RS-15-286 10 CFR 50.54(f)

December 4, 2015 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk 11555 Rockville Pike, Rockville, MD 20852 Calvert Cliffs Nuclear Power Plant, Units 1 and 2 Renewed Facility Operating License Nos. DPR-53 and DPR-69 NRC Docket Nos. 50-317 and 50-318

Subject:

High Frequency Supplement to Seismic Hazard Screening Report, Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding Recommendation 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident

References:

1. NRC Letter, Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(f) Regarding Recommendations 2.1, 2.3, and 9.3, of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident, dated March 12, 2012(ML12053A340)
2. NRC Letter, Electric Power Research Institute Report 3002000704, "Seismic Evaluation Guidance: Augmented Approach for the Resolution of Fukushima Near-Term Task Force Recommendation 2.1: Seismic," As An Acceptable Alternative to the March 12, 2012, Information Request for Seismic Reevaluations, dated May 7, 2013 (ML13106A331)
3. NEI Letter, Final Draft of Industry Seismic Evaluation Guidance (EPRI 1025287), dated November 27, 2012 (ML12333A168 and ML12333A170)
4. NRC Letter, Endorsement of Electric Power Research Institute Final Draft Report 1025287, "Seismic Evaluation Guidance", dated February 15, 2013(ML12319A074)
5. Constellation Energy Nuclear Group letter to NRC, Seismic Hazard and Screening Report (CEUS Sites), Response to NRC Request for Information Pursuant to 10CFR50.54(f) Regarding Recommendation 2.1 of Near-Term Task Force Review of Insights from the Fukushima Dai-lchi Accident: Calvert Cliffs Nuclear Power Plant, Units 1 and 2, dated March 31, 2014(ML14099A196)
6. NRC Letter, Screening and Prioritization Results Regarding Information Pursuant to Title 1O of the Code of Federal Regulations 50.54(f) Regarding Seismic Hazard Re-evaluations for Recommendation 2.1 of the Near Term Task Force Review of Insights from the Fukushima Dai-lchi Accident, dated May 9, 2014(ML14111A147)

U.S. Nuclear Regulatory Commission Seismic Hazard 2.1 High Frequency Supplement December 4, 2015 Page 2

7. NRC Letter, Support Document for Screening and Prioritization Results Regarding Seismic Hazard Re-Evaluation for Operating Reactors in the Central and Eastern United States, dated May 21, 2014 (ML14136A126)
8. NEI Letter, Request for NRC Endorsement of High Frequency Program: Application Guidance for Functional Confirmation and Fragility Evaluation (EPRI 3002004396),

dated July 30, 2015 (ML15223A100/ML15223A102)

9. NRC Letter, September 17, 2015 to NEI: Endorsement of Electric Power Research Institute Final Draft Report 3002004396: "High Frequency Program: Application Guidance for Functional Confirmation and Fragility" (ML15218A569)
10. NRC Letter, Final Determination of Licensee Seismic Probabilistic Risk Assessments Under the Request for Information Pursuant to Title 1O of the Code of Federal Regulations 50.54(f) Regarding Recommendation 2.1 "Seismic" of the Near-Term Task Force Review of Insights from the Fukushima Dai-lchi Accident, dated October 27, 2015 (ML15194A015)

On March 12, 2012, the Nuclear Regulatory Commission (NRC) issued a Request for Information per 10 CFR 50.54(f) (Reference 1) to all power reactor licensees. The required response section of Enclosure 1 of Reference 1 indicated that licensees should provide a Seismic Hazard Evaluation and Screening Report within 1.5 years from the date of the letter for Central and Eastern United States (CEUS) nuclear power plants. By NRC letter dated May 7, 2013 (Reference 2), the date to submit the report was extended to March 31, 2014.

By letter dated May 9, 2014 (Reference 6), the NRC transmitted the results of the screening and prioritization review of the seismic hazards reevaluation submittal for Calvert Cliffs Nuclear Power Plant, Units 1 and 2 (Reference 5). In accordance with the screening, prioritization, and implementation details report (SPID) (References 3 and 4), and Augmented Approach guidance (as endorsed in Reference 2), the reevaluated seismic hazard is used to determine if additional seismic risk evaluations are warranted for a plant. Specifically, the reevaluated horizontal ground motion response spectrum (GMRS) at the control point elevation is compared to the existing safe shutdown earthquake (SSE) or Individual Plant Examination for External Events (IPEEE) High Confidence of Low Probability of Failure (HCLPF) Spectrum (IHS) to determine if a plant is required to perform a high frequency confirmation evaluation. As noted in the May 9, 2014 letter from the NRC (Reference 6) on page 2 of Enclosure 2, Calvert Cliffs Nuclear Power Plant, Units 1 and 2 is to conduct a limited scope High Frequency Evaluation (Confirmation).

Within the May 9, 2014 letter (Reference 6), the NRC acknowledged that these limited scope evaluations will require additional development of the assessment process. By Reference 8, the Nuclear Energy Institute (NEI) submitted an Electric Power Research Institute (EPRI) report entitled, High Frequency Program: Application Guidance for Functional Confirmation and Fragility Evaluation (EPRI 3002004396) for NRC review and endorsement. NRC endorsement was provided by Reference 9. Reference 1O provided the NRC final seismic hazard evaluation screening determination results and the associated schedules for submittal of the remaining seismic hazard evaluation activities. This submittal is provided in accordance with Reference 1O, Table 1a, to address the High Frequency Evaluation information request for Calvert Cliffs Nuclear Power Plant, Units 1 and 2.

U.S. Nuclear Regulatory Commission Seismic Hazard 2.1 High Frequency Supplement December 4, 2015 Page 3 The High Frequency Confirmation for Calvert Cliffs Nuclear Power Plant Units 1 & 2 shows that the high-frequency spectral accelerations of the control point GMRS above 1OHz are within the limits identified in Section 3.1.1 of Reference 8 (less than or equal to 0.2g); therefore, no additional evaluation is necessary. The attachment to this letter provides the SSE and GMRS information from Reference 5.

This transmittal completes the scope of work described in Section 4.2 of Reference 5, for Calvert Cliffs Nuclear Power Plant, Units 1 and 2.

This letter contains no new regulatory commitments and closes the associated regulatory commitment contained in Reference 5 for Calvert Cliffs Nuclear Power Plant, Units 1 and 2.

If you have any questions regarding this report, please contact Ronald Gaston at 630-657-3359.

I declare under penalty of perjury that the foregoing is true and correct. Executed on the 4th day of December 2015.

Res~tt::mk-James Barstow Director - Licensing & Regulatory Affairs Exelon Generation Company, LLC

Attachment:

Calvert Cliffs Nuclear Power Plant, Units 1 and 2 GMRS and SSE Supporting Information cc: Regional Administrator - NRC Region I NRC Senior Resident Inspector- Calvert Cliffs Nuclear Power Plant NRC Project Manager, NRR - Calvert Cliffs Nuclear Power Plant Mr. Nicholas DiFrancesco, NRR/JLD/JHMB, NRC

Attachment Calvert Cliffs Nuclear Power Plant, Units 1 and 2 GMRS and SSE Supporting Information (Reference 5)

(2 Pages)

Table 1 - Calvert Cliffs Nuclear Power Plant Units 1 & 2 SSE and GMRS data SSE GMRS Freq Acee I Freq Acee I (Hz) (g) (Hz) (g) 0.1 0.008 0.1 0.0114 0.12S 0.012 0.12S 0.0142 O.lS 0.018 O.lS 0.0170 0.2 0.029 0.2 0.0227 0.2S 0.041 0.2S 0.0284 0.3 0.049 0.3 0.0341 0.3S O.OS7 0.3S 0.0398 0.4 0.063 0.4 0.04S4 o.s 0.074 o.s O.OS68 0.6 0.08S 0.6 0.06SO 0.7 0.09S 0.7 0.079S 0.8 0.104 0.8 0.0827 0.9 0.112 0.9 0.0870 1 0.123 1 0.0970 1.2S 0.14S 1.2S 0.117 1.S 0.166 1.S 0.128 2 0.198 2 0.143 2.S 0.217 2.5 0.148 3 0.226 3 0.164 3.S 0.226 3.S 0.176 4 0.222 4 0.18S s 0.212 s 0.200 6 0.197 6 0.203 7 0.188 7 0.204 8 0.179 8 0.200 9 0.168 9 0.194 10 0.160 10 0.188 12.S 0.1S2 12.S 0.188 lS 0.1S2 lS 0.182 20 0.1S2 20 0.180 2S 0.1S1 2S 0.18S 30 0.1S1 30 0.168 3S 0.1S1 3S 0.1S7 40 O.lSO 40 0.149 so O.lSO so 0.138 60 O.lSO 60 0.130 70 O.lSO 70 0.124 80 O.lSO 80 0.119 90 O.lSO 90 0.11S 100 O.lSO 100 0.112 Page 1of2

Figure 1 Calvert Cliffs Nuclear Power Plant Units 1 & 2 GMRS to SSE Comparison 0.5 0.45 -!-------~ '----------r-0.4 ,...-'----+----+------

0.35 - - - - -:-

bl) c 0.3 - SSE

.g I!

cu -+-------.~

- GMRS 0.25 ,..---J----*-_L...,

Qj u

u ct 0.2

---.~__,,.______,,,____ .> c ...._ __J_ _1 0.15 I ff --=-'-

0.1 1' 0.05 0

0.1 1 10 100 Frequency (Hz)

Page 2of2

Exelon Generation RS-15-286 10 CFR 50.54(f)

December 4, 2015 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk 11555 Rockville Pike, Rockville, MD 20852 Calvert Cliffs Nuclear Power Plant, Units 1 and 2 Renewed Facility Operating License Nos. DPR-53 and DPR-69 NRC Docket Nos. 50-317 and 50-318

Subject:

High Frequency Supplement to Seismic Hazard Screening Report, Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding Recommendation 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident

References:

1. NRC Letter, Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(f) Regarding Recommendations 2.1, 2.3, and 9.3, of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident, dated March 12, 2012(ML12053A340)
2. NRC Letter, Electric Power Research Institute Report 3002000704, "Seismic Evaluation Guidance: Augmented Approach for the Resolution of Fukushima Near-Term Task Force Recommendation 2.1: Seismic," As An Acceptable Alternative to the March 12, 2012, Information Request for Seismic Reevaluations, dated May 7, 2013 (ML13106A331)
3. NEI Letter, Final Draft of Industry Seismic Evaluation Guidance (EPRI 1025287), dated November 27, 2012 (ML12333A168 and ML12333A170)
4. NRC Letter, Endorsement of Electric Power Research Institute Final Draft Report 1025287, "Seismic Evaluation Guidance", dated February 15, 2013(ML12319A074)
5. Constellation Energy Nuclear Group letter to NRC, Seismic Hazard and Screening Report (CEUS Sites), Response to NRC Request for Information Pursuant to 10CFR50.54(f) Regarding Recommendation 2.1 of Near-Term Task Force Review of Insights from the Fukushima Dai-lchi Accident: Calvert Cliffs Nuclear Power Plant, Units 1 and 2, dated March 31, 2014(ML14099A196)
6. NRC Letter, Screening and Prioritization Results Regarding Information Pursuant to Title 1O of the Code of Federal Regulations 50.54(f) Regarding Seismic Hazard Re-evaluations for Recommendation 2.1 of the Near Term Task Force Review of Insights from the Fukushima Dai-lchi Accident, dated May 9, 2014(ML14111A147)

U.S. Nuclear Regulatory Commission Seismic Hazard 2.1 High Frequency Supplement December 4, 2015 Page 2

7. NRC Letter, Support Document for Screening and Prioritization Results Regarding Seismic Hazard Re-Evaluation for Operating Reactors in the Central and Eastern United States, dated May 21, 2014 (ML14136A126)
8. NEI Letter, Request for NRC Endorsement of High Frequency Program: Application Guidance for Functional Confirmation and Fragility Evaluation (EPRI 3002004396),

dated July 30, 2015 (ML15223A100/ML15223A102)

9. NRC Letter, September 17, 2015 to NEI: Endorsement of Electric Power Research Institute Final Draft Report 3002004396: "High Frequency Program: Application Guidance for Functional Confirmation and Fragility" (ML15218A569)
10. NRC Letter, Final Determination of Licensee Seismic Probabilistic Risk Assessments Under the Request for Information Pursuant to Title 1O of the Code of Federal Regulations 50.54(f) Regarding Recommendation 2.1 "Seismic" of the Near-Term Task Force Review of Insights from the Fukushima Dai-lchi Accident, dated October 27, 2015 (ML15194A015)

On March 12, 2012, the Nuclear Regulatory Commission (NRC) issued a Request for Information per 10 CFR 50.54(f) (Reference 1) to all power reactor licensees. The required response section of Enclosure 1 of Reference 1 indicated that licensees should provide a Seismic Hazard Evaluation and Screening Report within 1.5 years from the date of the letter for Central and Eastern United States (CEUS) nuclear power plants. By NRC letter dated May 7, 2013 (Reference 2), the date to submit the report was extended to March 31, 2014.

By letter dated May 9, 2014 (Reference 6), the NRC transmitted the results of the screening and prioritization review of the seismic hazards reevaluation submittal for Calvert Cliffs Nuclear Power Plant, Units 1 and 2 (Reference 5). In accordance with the screening, prioritization, and implementation details report (SPID) (References 3 and 4), and Augmented Approach guidance (as endorsed in Reference 2), the reevaluated seismic hazard is used to determine if additional seismic risk evaluations are warranted for a plant. Specifically, the reevaluated horizontal ground motion response spectrum (GMRS) at the control point elevation is compared to the existing safe shutdown earthquake (SSE) or Individual Plant Examination for External Events (IPEEE) High Confidence of Low Probability of Failure (HCLPF) Spectrum (IHS) to determine if a plant is required to perform a high frequency confirmation evaluation. As noted in the May 9, 2014 letter from the NRC (Reference 6) on page 2 of Enclosure 2, Calvert Cliffs Nuclear Power Plant, Units 1 and 2 is to conduct a limited scope High Frequency Evaluation (Confirmation).

Within the May 9, 2014 letter (Reference 6), the NRC acknowledged that these limited scope evaluations will require additional development of the assessment process. By Reference 8, the Nuclear Energy Institute (NEI) submitted an Electric Power Research Institute (EPRI) report entitled, High Frequency Program: Application Guidance for Functional Confirmation and Fragility Evaluation (EPRI 3002004396) for NRC review and endorsement. NRC endorsement was provided by Reference 9. Reference 1O provided the NRC final seismic hazard evaluation screening determination results and the associated schedules for submittal of the remaining seismic hazard evaluation activities. This submittal is provided in accordance with Reference 1O, Table 1a, to address the High Frequency Evaluation information request for Calvert Cliffs Nuclear Power Plant, Units 1 and 2.

U.S. Nuclear Regulatory Commission Seismic Hazard 2.1 High Frequency Supplement December 4, 2015 Page 3 The High Frequency Confirmation for Calvert Cliffs Nuclear Power Plant Units 1 & 2 shows that the high-frequency spectral accelerations of the control point GMRS above 1OHz are within the limits identified in Section 3.1.1 of Reference 8 (less than or equal to 0.2g); therefore, no additional evaluation is necessary. The attachment to this letter provides the SSE and GMRS information from Reference 5.

This transmittal completes the scope of work described in Section 4.2 of Reference 5, for Calvert Cliffs Nuclear Power Plant, Units 1 and 2.

This letter contains no new regulatory commitments and closes the associated regulatory commitment contained in Reference 5 for Calvert Cliffs Nuclear Power Plant, Units 1 and 2.

If you have any questions regarding this report, please contact Ronald Gaston at 630-657-3359.

I declare under penalty of perjury that the foregoing is true and correct. Executed on the 4th day of December 2015.

Res~tt::mk-James Barstow Director - Licensing & Regulatory Affairs Exelon Generation Company, LLC

Attachment:

Calvert Cliffs Nuclear Power Plant, Units 1 and 2 GMRS and SSE Supporting Information cc: Regional Administrator - NRC Region I NRC Senior Resident Inspector- Calvert Cliffs Nuclear Power Plant NRC Project Manager, NRR - Calvert Cliffs Nuclear Power Plant Mr. Nicholas DiFrancesco, NRR/JLD/JHMB, NRC

Attachment Calvert Cliffs Nuclear Power Plant, Units 1 and 2 GMRS and SSE Supporting Information (Reference 5)

(2 Pages)

Table 1 - Calvert Cliffs Nuclear Power Plant Units 1 & 2 SSE and GMRS data SSE GMRS Freq Acee I Freq Acee I (Hz) (g) (Hz) (g) 0.1 0.008 0.1 0.0114 0.12S 0.012 0.12S 0.0142 O.lS 0.018 O.lS 0.0170 0.2 0.029 0.2 0.0227 0.2S 0.041 0.2S 0.0284 0.3 0.049 0.3 0.0341 0.3S O.OS7 0.3S 0.0398 0.4 0.063 0.4 0.04S4 o.s 0.074 o.s O.OS68 0.6 0.08S 0.6 0.06SO 0.7 0.09S 0.7 0.079S 0.8 0.104 0.8 0.0827 0.9 0.112 0.9 0.0870 1 0.123 1 0.0970 1.2S 0.14S 1.2S 0.117 1.S 0.166 1.S 0.128 2 0.198 2 0.143 2.S 0.217 2.5 0.148 3 0.226 3 0.164 3.S 0.226 3.S 0.176 4 0.222 4 0.18S s 0.212 s 0.200 6 0.197 6 0.203 7 0.188 7 0.204 8 0.179 8 0.200 9 0.168 9 0.194 10 0.160 10 0.188 12.S 0.1S2 12.S 0.188 lS 0.1S2 lS 0.182 20 0.1S2 20 0.180 2S 0.1S1 2S 0.18S 30 0.1S1 30 0.168 3S 0.1S1 3S 0.1S7 40 O.lSO 40 0.149 so O.lSO so 0.138 60 O.lSO 60 0.130 70 O.lSO 70 0.124 80 O.lSO 80 0.119 90 O.lSO 90 0.11S 100 O.lSO 100 0.112 Page 1of2

Figure 1 Calvert Cliffs Nuclear Power Plant Units 1 & 2 GMRS to SSE Comparison 0.5 0.45 -!-------~ '----------r-0.4 ,...-'----+----+------

0.35 - - - - -:-

bl) c 0.3 - SSE

.g I!

cu -+-------.~

- GMRS 0.25 ,..---J----*-_L...,

Qj u

u ct 0.2

---.~__,,.______,,,____ .> c ...._ __J_ _1 0.15 I ff --=-'-

0.1 1' 0.05 0

0.1 1 10 100 Frequency (Hz)

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