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Category:E-Mail
MONTHYEARML24122C6922024-05-0101 May 2024 NextEra Fleet EP Amendment - Demonstration Drill ML23109A1862023-04-19019 April 2023 and Turkey Point Acceptance of Requested Licensing Action Proposed Alternative to Asme Section XI Authorizing Implementation of Asme Code Case N-752-1 ML22067A0922022-03-0303 March 2022 State Consultation - Duane Arnold ISFSI-Only EP License Amendment ML22040A1162022-02-0808 February 2022 Email to G. Van Noordennen Zion and La Crosse Review Schedule Changes ML22027A3582022-01-26026 January 2022 DAEC: CY2022 Inspection Plan, Docket No: 05000331, License No: DPR-49 ML22007A3102022-01-0505 January 2022 State Consultation - Draft No Significant Hazards Determination Regarding a LAR for NextEra Energy Duane Arnold, LLC, Duane Arnold Energy Center ISFSI in Palo, Iowa ML22005A0992022-01-0404 January 2022 Email from a Snyder to a Leek Re State Consultation - Draft No Significant Hazards Determination - License Amend. Req. for NextEra Energy, LLC, DAEC ISFSI in Palo, Iowa ML22005A0862022-01-0404 January 2022 1-4-2022 Email Communication to Duane Arnold Regarding Its ISFSI Related Exemption Request on Supplemental Information Needed ML22005A1012022-01-0404 January 2022 Email from a Leek to a Snyder Re State Consultation - Draft No Significant Hazards Determination - License Amend. Req. for NextEra Energy, LLC, DAEC ISFSI in Palo Iowa ML22004A0122022-01-0303 January 2022 E-mail from M. Davis, NextEra, to A. Snyder, NRC, - Duane Arnold Energy Center - Supplement Information to Technical Specification Amendment Application ML21354A6722021-12-17017 December 2021 Email to State of Iowa - Draft EA on Duane Arnold Exemption ML21214A0502021-08-0101 August 2021 Acceptance of License Amendment Request to Adopt an ISFSI-Only Physical Security Plan ML21214A0482021-08-0101 August 2021 Acceptance of License Amendment Request to Adopt an ISFSI-Only Emergency Plan ML21165A1212021-06-10010 June 2021 E-mail from M. Davis, Duane Arnold, to M. Doell and R. Edwards, NRC - Duane Arnold Defueled Emergency Plan Implementation Confirmation ML21117A2752021-04-26026 April 2021 Acceptance of Updated Spent Fuel Management Plan ML21089A2092021-03-19019 March 2021 Spent Fuel Pattern Procedure ML21068A3352021-03-0707 March 2021 Acceptance of License Amendment Request to Adopt ISFSI-Only Technical Specifications ML21056A2172021-02-17017 February 2021 Acceptance of License Amendment Request to Revise the Physical Security Plan Requirements ML21032A1852021-02-0101 February 2021 Daec_ CY2021 Inspection Plan ML21006A4052021-01-0606 January 2021 NRR E-mail Capture - Final RAI - Duane Arnold - Post-Shutdown Decommissioning Activities Report ML20338A0032020-12-0101 December 2020 Letter from EPRI to Mr. Scott Wall, BWRVIP 2020-100, 288 Surveillance Capsule Test Results Report ML20316A0212020-11-10010 November 2020 NRR E-mail Capture - Final RAI - Duane Arnold - Duane Arnold Amendment for Proposed Defueled EP and EAL Scheme ML20289A3522020-10-14014 October 2020 NRR E-mail Capture - Duane Arnold Energy Center -Acceptance of Requested Licensing Action, One-Time Exemption from 10 CFR 50, Appendix E, Biennial Emergency Preparedness Exercise Requirements Due to COVID-19 Pandemic (EPID No. L-2020-LLE-01 ML20153A3772020-05-28028 May 2020 NRR E-mail Capture - Request for Additional Information - Duane Arnold Energy Center Quality Assurance Topical Report (FPL-3) - EPID L-2020-LLQ-0002) ML20154K6202020-05-27027 May 2020 COVID-19 Preparedness Assessments for FEMA Region VII Duane Arnold Energy Center (DAEC) and Quad Cities Generating Station (Qcgs) ML20141L8132020-05-19019 May 2020 NRR E-mail Capture - Request for Additional Information - Duane Arnold Energy Center (DAEC) - Exemption Request for Security Training Requirements Due to COVID-19 Pandemic - EPID L-2020-LLE-0042 to 45, L-2020-LLE-0051 ML20129J8282020-05-0606 May 2020 NRR E-mail Capture - LIC-109 Acceptance Review of Duane Arnold Request for Exemption from Portions of 10 CFR 50.47 and Appendix E - EPID L-2020-LLE-0023 ML20127H8662020-05-0505 May 2020 NRR E-mail Capture - Duane Arnold Energy Center (DAEC) - Request for Additional Information (RAI) - Request for Exemptions from 10 CFR 50.82(a)(8)(i)(A) and 1O CFR 50.75(h)(1)(iv) - EPID L-2020-LLE-0011 ML20122A1152020-04-30030 April 2020 NRR E-mail Capture - Duane Arnold Energy Center -Acceptance of Post-Shutdown Decommissioning Activities Report ML20087F2872020-03-26026 March 2020 NRR E-mail Capture - LIC-109 Acceptance Review of Duane Arnold Request for Exemption from 10 CFR 50.82(a)(8)(i)(A) and 1O CFR 50.75(h)(1)(iv) - EPID L-2020-LLE-0011 ML20129J8322020-03-19019 March 2020 NRR E-mail Capture - (External_Sender) Teleconference with Nextra Energy - Duane Arnold Physical Security Plan LIC-109 Review Status ML20022A3602020-01-22022 January 2020 NRR E-mail Capture - Duane Arnold Energy Center - Acceptance of Requested Licensing Action, Proposed Partial Exemption from Record Retention Requirements ML19352G6872019-12-11011 December 2019 12-11-19 Email to FEMA: Response to FEMA Questions on Proposed DAEC Emergency Plan ML19302G9732019-10-29029 October 2019 NRR E-mail Capture - LIC-109 Acceptance of Duane Arnold Energy Center (DAEC) - License Amendment Request (TSCR- 186): Removal of License Condition 2.C.(3), Fire Protection Program - EPID L-2019-LLA-0211 ML19302G3212019-10-29029 October 2019 LIC-109 Acceptance of Duane Arnold Energy Center (DAEC) - License Amendment Request (TSCR- 186) - Removal of License Condition 2.C.(3), Fire Protection Program - EPID L-2019-LLA-0211 ML19280A0352019-10-0404 October 2019 NRR E-mail Capture - Final - RAI Related to License Amendment Request (TSCR-182) for Proposed Changes to the Emergency Plan for Permanently Defueled Conditions at Duane Arnold Energy Center (DAEC) - L-2019-LLA-0075 ML19206A2182019-07-25025 July 2019 NRR E-mail Capture - LIC-109 Acceptance of Duane Arnold Energy Center (DAEC) - License Amendment Request (TSCR-183) - Application to Revise Operating License and TS for Permanently Defueled Condition - EPID L-2019-LLA-0130 ML19183A0172019-06-26026 June 2019 NRR E-mail Capture - LIC-109 Acceptance of Request for Change in the BWRVIP Integrated Surveillance Program Test Schedule to Accommodate Early Closure of the Duane Arnold Energy Center - EPID L-2019-LRO-0042 ML19122A4882019-04-29029 April 2019 NRR E-mail Capture - LIC-109 Acceptance of License Amendment Request (TSCR-182) for Duane Arnold Energy Center (DAEC) - Proposed Changes to the Emergency Plan for Permanently Defueled Condition - EPID L-2019-LLA-0075 ML19086A3502019-03-27027 March 2019 NRR E-mail Capture - LIC-109 Acceptance of the Request for Exemption from 10 CFR 73.55(p)(1)(I) and 10 CFR 73.55(p)(1)(ii) for Duane Arnold Energy Center - EPID L-2019-LLE-0003 ML19064A2032019-03-0404 March 2019 NRR E-mail Capture - Results of LIC-109 Acceptance Review - Duane Arnold Energy Center - Request for Approval of Certified Fuel Handler Training Program, EPID L-2019-LLL-0003 ML18283B0522018-10-0909 October 2018 NRR E-mail Capture - Final Second Round - Request for Additional Information (RAI) - Duane Arnold Energy Center (DAEC) - LAR TSCR-166, Adoption of EAL Scheme Pursuant to NEI 99-01 - EPID L-2017-LLA-0420 ML18255A2922018-09-11011 September 2018 NRR E-mail Capture - Draft Second Round - Request for Additional Information (RAI) - Duane Arnold Energy Center (DAEC) - LAR TSCR-166, Adoption of EAL Scheme Pursuant to NEI 99-01 - EPID L-2017-LLA-0420 ML18166A2982018-06-15015 June 2018 NRR E-mail Capture - Draft Request for Additional Information (RAI) - Duane Arnold Energy Center (DAEC) - LAR TSCR-166, Adoption of EAL Scheme Pursuant to NEI 99-01 - EPID L-2017-LLA-0420 ML18108A3102018-04-12012 April 2018 NRR E-mail Capture - Audit at NextEra Headquarters, Juno Beach, Florida - April 24, 2018 Through April 26, 2018 - 50.69 LARs for Duane Arnold Energy Center (Daec), and Point Beach Nuclear Plant (Pbnp), Units 1 and 2 - EPIDs L-2017-LLA-0283/ ML18088A0102018-03-28028 March 2018 NRR E-mail Capture - Final RAI for Duane Arnold (DAEC) 5th-10 Year ISI (RR-05) ML18037B0032018-02-0606 February 2018 NRR E-mail Capture - Draft Request for Additional Information - Duane Arnold Energy Center (DAEC) - License Amendment Request (TSCR-170), Revision to Technical Specification 3.5.1, ECCS-Operating - EPID L-2017-LLA-0288 ML18025A2362018-01-24024 January 2018 NRR E-mail Capture - Resent - LIC-109 Acceptance - Duane Arnold LAR (TSCR-166) - Adoption of Emergency Action Level (EAL) Scheme Pursuant to NEI 99-01, Revision 6, Development of EALs for Non-Passive Reactors ML18023A0752018-01-22022 January 2018 NRR E-mail Capture - LIC-109 Acceptance - Duane Arnold License Amendment Request (LAR) (TSCR-179) - Application to Add Technical Specification 3.2.3, Linear Heat Generation Rate - EPID: L-2017-LLA-0436 ML18019A0732018-01-18018 January 2018 NRR E-mail Capture - LIC-109 Acceptance - Duane Arnold License Amend Request (LAR)(TSCR-178) - Application to Reduce the Required Number of Operable Suppression Chamber-to-Drywell Vacuum Breakers 2024-05-01
[Table view] Category:Request for Additional Information (RAI)
MONTHYEARML24193A2432024-07-12012 July 2024 – Interim Audit Summary Report in Support of Review of License Amendment Requests Regarding Fleet Emergency Plan ML22005A0862022-01-0404 January 2022 1-4-2022 Email Communication to Duane Arnold Regarding Its ISFSI Related Exemption Request on Supplemental Information Needed ML21335A0712021-12-0101 December 2021 Request for Additional Information - Duane Arnold Energy Center ISFSI Only Emergency Plan ML21335A0702021-12-0101 December 2021 Cover Letter to B. Coffey from K. Conway - Duane Arnold Energy Center RAI Re License Amendment Request for ISFSI Only Emergency Plan ML21250A3002021-09-0808 September 2021 Defueled Physical Security Plan RAI Cover Letter ML21006A4052021-01-0606 January 2021 NRR E-mail Capture - Final RAI - Duane Arnold - Post-Shutdown Decommissioning Activities Report ML20316A0212020-11-10010 November 2020 NRR E-mail Capture - Final RAI - Duane Arnold - Duane Arnold Amendment for Proposed Defueled EP and EAL Scheme ML20153A3772020-05-28028 May 2020 NRR E-mail Capture - Request for Additional Information - Duane Arnold Energy Center Quality Assurance Topical Report (FPL-3) - EPID L-2020-LLQ-0002) ML20141L8132020-05-19019 May 2020 NRR E-mail Capture - Request for Additional Information - Duane Arnold Energy Center (DAEC) - Exemption Request for Security Training Requirements Due to COVID-19 Pandemic - EPID L-2020-LLE-0042 to 45, L-2020-LLE-0051 ML20133K0482020-05-14014 May 2020 Information Request to Support the NRC Annual Baseline Emergency Action Level and Emergency Plan Changes Inspection ML20127H8662020-05-0505 May 2020 NRR E-mail Capture - Duane Arnold Energy Center (DAEC) - Request for Additional Information (RAI) - Request for Exemptions from 10 CFR 50.82(a)(8)(i)(A) and 1O CFR 50.75(h)(1)(iv) - EPID L-2020-LLE-0011 ML19280A0352019-10-0404 October 2019 NRR E-mail Capture - Final - RAI Related to License Amendment Request (TSCR-182) for Proposed Changes to the Emergency Plan for Permanently Defueled Conditions at Duane Arnold Energy Center (DAEC) - L-2019-LLA-0075 ML18283B0522018-10-0909 October 2018 NRR E-mail Capture - Final Second Round - Request for Additional Information (RAI) - Duane Arnold Energy Center (DAEC) - LAR TSCR-166, Adoption of EAL Scheme Pursuant to NEI 99-01 - EPID L-2017-LLA-0420 ML18255A2922018-09-11011 September 2018 NRR E-mail Capture - Draft Second Round - Request for Additional Information (RAI) - Duane Arnold Energy Center (DAEC) - LAR TSCR-166, Adoption of EAL Scheme Pursuant to NEI 99-01 - EPID L-2017-LLA-0420 ML18247A2002018-08-21021 August 2018 E-Mailed Request for Information for Duane Arnold, Dated 08/21/18 (DRS-M.Holmberg) ML18166A2982018-06-15015 June 2018 NRR E-mail Capture - Draft Request for Additional Information (RAI) - Duane Arnold Energy Center (DAEC) - LAR TSCR-166, Adoption of EAL Scheme Pursuant to NEI 99-01 - EPID L-2017-LLA-0420 ML18088A0102018-03-28028 March 2018 NRR E-mail Capture - Final RAI for Duane Arnold (DAEC) 5th-10 Year ISI (RR-05) ML18058A0522018-02-27027 February 2018 Enclosurequest for Additional Information (Letter: RAI Regarding Florida Power and Light/Nextera Decommissioning Funding Plan Updates for St. Lucie, Units 1 & 2; Seabrook Station; Duane Arnold Energy Center; and Point Beach, Units 1 and 2) ML18037B0032018-02-0606 February 2018 NRR E-mail Capture - Draft Request for Additional Information - Duane Arnold Energy Center (DAEC) - License Amendment Request (TSCR-170), Revision to Technical Specification 3.5.1, ECCS-Operating - EPID L-2017-LLA-0288 ML17347A8752017-12-12012 December 2017 NRR E-mail Capture - Second Round of Request for Additional Information - Duane Arnold Energy Center (DAEC) - LAR to Adopt TST-542, Revision 2, Reactor Pressure Vessel Water Inventory Control - CAC No. MF9829 ML17277A3652017-10-0404 October 2017 NRR E-mail Capture - Final Request for Additional Information - Duane Arnold - Application to Revise Technical Specifications to Adopt TSTF-542, Revision 2, Reactor Pressure Vessel Water Inventory Control - CAC No. MF9829 ML17240A0082017-08-25025 August 2017 NRR E-mail Capture - Request for Additional Information - Duane Arnold Energy Center (DAEC) - Fifth Ten Year Service Inspection Interval - Relief Request No. RR-04, Rev. 0 - Proposed Alternative for Seal Weld Procedure Qualification - MF937 ML17220A3332017-08-0808 August 2017 NRR E-mail Capture - Request for Additional Information - Duane Arnold Energy Center - Relief Request No. RR-03 - Alternative Requirements for Nozzle Inner Radius and Nozzle-To-Shell Welds - CAC No. MF9374 ML17159A7962017-06-0707 June 2017 17 Duane Arnold Energy Center - Information Request to Support the NRC Annual Baseline Emergency Action Level and Emergency Plan Changes Inspection (Mxg) ML17068A0632017-03-0808 March 2017 NRR E-mail Capture - Final - Request for Additional Information (RAI) - Duane Arnold Energy Center (DAEC) - Revision to Staff Augmentation Times in the Duane Arnold Energy Center (DAEC) Emergency Plan (Eplan) - MF8390 ML16333A4622016-11-28028 November 2016 NRR E-mail Capture - Final Request for Additional Information - Duane Arnold Energy Center - LAR - SFP Criticality - MF7486 ML16326A0092016-11-18018 November 2016 NRR E-mail Capture - Request for Additional Information Re. Nextera/Fpl LAR to Adopt TSTF-545 - CACs MF8203, MF8204, MF8208, and MF8209 ML16313A0742016-11-0808 November 2016 NextEra Audit Plan Nov 2016 (DAEC SFP Criticality LAR) ML16075A0032016-03-14014 March 2016 NRR E-mail Capture - Request for Additional Information - Duane Arnold Energy Center - LAR to Reduce the Reactor Steam Dome Pressure Specified in the Technical Specifications 2.1.1, Reactor Core Safety Limits - MF6618 ML16074A3142016-03-14014 March 2016 NRR E-mail Capture - Second Round RAIs - Duane Arnold Energy Center - LAR (TSCR-143) to Extend Containment Leakage Test Frequency - MF6619 ML16021A0122016-01-21021 January 2016 Request for Additional Information by the Containment & Ventilation Branch and PRA Licensing Branch License Amendment Request - Extension of the 10 CFR 50 Appendix J Containment Type a & Type C Test Intervals ML16022A0092016-01-21021 January 2016 NRR E-mail Capture - Request for Additional Information - LAR to Revise and Relocate Pressure and Temperature Limit Curves to a Pressure and Temperature Limits Report - MF6617 ML16014A6962016-01-0707 January 2016 E-Mail: Duane Arnold, MOD/50.59 Inspection Request for Information (Jsp) ML16005A6082015-12-24024 December 2015 E-Mail: Duane Arnold Request for Information; December 24, 2015 (AAS) ML15175A0652015-06-23023 June 2015 Ltr. 06/23/15 Duane Arnold Energy Center - Notification of an NRC Triennial Heat Sink Performance Inspection and Request for Information Inspection Report 05000331/2015003 (Axd) ML14057A7562014-02-25025 February 2014 14 Duane Arnold CDBI Request for Information ML14031A1462014-01-29029 January 2014 Update to NextEra Energy Duane Arnold, Llc'S Response to NRC Request for Additional Information Associated with Near-Term Task Force Recommendations ML13323B4432013-11-26026 November 2013 Interim Staff Evaluation and Request for Additional Information Regarding the Overall Integrated Plan for Implementation of Order EA-12-051, Reliable Spent Fuel Pool Instrumentation ML13255A1982013-09-16016 September 2013 Request for Additional Information Regarding Overall Integrated Plan for Reliable Spent Fuel Pool Instrumentation (Order Number EA-12-051) ML13175A3932013-06-27027 June 2013 Request for Additional Information for Review Regarding License Amendment Request to Adopt National Fire Protection Association Standard 805 ML13154A5112013-06-0404 June 2013 Rai'S Following Ifib Analysis of NextEra Energy'S 2013 Decommissioning Funding Status Reports for Duane Arnold Energy Center and Point Beach Units 1 and 2 ML12107A0592012-04-11011 April 2012 NRR E-mail Capture - ME7246 - DAEC - Request for Additional Information (RAI) Relief Requests NDR-R003, R010, R011, R014, R015 ML12056A0502012-03-12012 March 2012 Enclosure 4 - Recommendation 2.3: Flooding ML12056A0482012-03-12012 March 2012 Enclosure 2 - Recommendation 2.1: Flooding ML12056A0512012-03-12012 March 2012 Enclosure 5 - Recommendation 9.3: Emergency Preparedness ML12056A0492012-03-12012 March 2012 Enclosure 3 - Recommendation 2.3: Seismic ML12056A0472012-03-12012 March 2012 Enclosure 1 - Recommendation 2.1: Seismic ML1201203182012-01-17017 January 2012 Request for Additional Information Amendment to Change Emergency Action Levels ML12011A0602012-01-0404 January 2012 NRR E-mail Capture - ME6508 - DAEC - Emergency Action Level (EAL) Changes ML1132105812011-11-28028 November 2011 Request for Additional Information Regarding 60-Day Response to Bulletin 2011-01, Mitigating Strategies. 2024-07-12
[Table view] |
Text
1NRR-PMDAPEm Resource From:Chawla, Mahesh Sent:Monday, March 14, 2016 8:59 AM To:laura.swenzinski@nexteraener gy.com; Davis, J.Michael (J.Michael.Davis@nexteraenergy.com); Cross, William (WILLIAM.CROSS@fpl.com)
Cc:Reisifard, Mehdi; Rosenberg, Stacey; Wrona, David; Steffes, Jakob; Norton, Charles; Stoedter, Karla; Phillips, Charles
Subject:
Second Round RAIs - Duane Arnold Ener gy Center - LAR (TSCR-143) to Extend Containment Leakage Test Frequency - MF6619In a letter dated August 18, 2015, (Agencywide Documents Access and Management System (ADAMS) Accession No. ML15246A445), as supplemented by letter dated January 29, 2016 (ADAMS Accession No. ML16034A031), NextEra Energy Duane Arnold, LLC requested an amendment to Duane Arnold Energy Center (DAEC) Technical Specifications (TS). The proposed amendment will revise DAEC TS Section 5.5.12, "Primary Containment Leakage Rate Testing Program," to allow extension of the Type A test interval up to one test in 15 years and extension of the Type C test interval up to 75 months.
The Probabilistic Risk Assessment Licensing Branch issued Request for Additional Information (RAI) by letter dated November 24, 2015 (ADAMS Accession No. ML15327A476) and the licensee provided responses to the RAI in letter dated January 29, 2016. The NRC staff has reviewed the responses and has determined that additional information is needed for the staff to complete its evaluation. The request for additional information is
provided as below:
Second Round of Request for Additional Information Regarding Duane Arnold Energy Center Request to Permanently Extend the Integrated Leak Rate Test Frequency to 15 Years In an electronic communication dated December 15, 2015, the NRC staff requested a list of all findings from the past peer reviews and self-assessments relevant to the Integrated Leak Rate Test (ILRT) extension submittal, dated August 18, 2015, for which the internal events probabilistic risk assessment (PRA) did not meet the American Society of Mechanical Engineers (ASME) PRA Standard Capability Category (CC) I supporting requirements (SRs) and requested the licensee to summarize why not meeting each CC I
requirement would have no impact on this application (PRA request for additional information (RAI)-1.b). In response to PRA RAI-1.b, the licensee identified five SRs, IE-B3, IE-C6, HR-A1, HR-A2 and HR-C1, which were assessed as not meeting CC I. The licensee further discussed the impact of findings associated with those SRs on the Duane Arnold Energy Center (DAEC) containment leakage test frequency extension request in Table 1 of the response.
In discussing the impact of not meeting SRs IE-B3 and IE-C6, the licensee stated, in part, that:
Substantial margin to the guidelines contained in Regulatory Guide 1.174 have been demonstrated for this ILRT test interval extension request with respect to acceptable changes in [large early release frequency] LERF. ... Change in the Type A ILRT test interval from the three in ten years to one in fifteen years is conservatively estimated to represent a 2.57E-08/yr increase in LERF. Postulated increase in baseline values of [core damage frequency] CDF and LERF result in approximately the same fractional increase in the calculated delta-LERF for this application. For example, a large increase in baseline CDF and LERF, such as 10 percent, would translate into an increase in delta-LERF of about 10 percent, resulting in a final delta-LERF that is still well below the 1E-07 criteria for which the impact of the requested ILRT testing extension is considered to be very small. As such, these criteria would also 2not be exceeded by inclusion of additional initiators in the PRA as required for closure of this Peer Review item.
In discussing the impact of not meeting SR HR-C1, the licensee stated that:
The impact of evaluating pre- initiators at the train level instead of the system level, or at the system level instead of the train level, is judged to have little or no impact on baseline values of CDF and LERF. Even if the actual impact of addressing this gap is more than minor, the change translates into only a small reduction in margin to criteria established for the ILRT testing interval extension application as described earlier with respect to finding IE-B3-01A. As such, the conclusions of the risk evaluation performed for this application are not changed by this variance from the standard.
The estimated increase in LERF of 2.57E-08/yr does not include the risk from external events. In the original submittal, the licensee estimated the total increase in LERF from both internal and external events as 8.14E-08/yr. Furthermore, this impact estimate (from both external hazards and internal events) provided in the original submittal does not include the new seismic hazard CDF and LERF estimates, which were provided in response to PRA RAI-2. The new seismic CDF estimate in response to PRA RAI-2 is larger than the seismic CDF estimate in the original submittal by more than a factor of 8. Although the licensee provided an estimate change in LERF of 6.80E-08/yr in response to PRA RAI-2 when providing the new seismic CDF estimate, this change in LERF estimate does not appear to include the risk from other external hazards or internal events.
The NRC staff believes that the change in LERF could increase to a value greater than 1E-07/yr when the impact from external events is considered, the new seismic CDF and LERF estimates from response to PRA RAI-2 are used, and the findings related to IE-B3, IE-C6, and HR-C1 are resolved. For a change in LERF greater than 1E-07/yr, the licensee should provide total LERF and demonstrate that the RG 1.174 guidelines are met. The licensee provided total LERF estimate of 9.79E-06/yr in the original submittal. Again, this estimate could exceed the guideline value of 1E-05/yr once the new seismic risk estimates are considered and the findings associated with the above SRs are resolved.
In summary, the NRC staff does not find the information provided by the licensee in the original submittal and in response to PRA RAIs to be sufficient for determining that the change in LERF is less than 1E-07/yr (to meet the guidelines of RG 1.174 Region III) or the total LERF is less than 1E-05/yr (to meet the guidelines of RG
1.174 Region II).
Show that the change in LERF does not exceed 1E-07/yr by including the impact of external hazards, using updated seismic risk estimates and providing a sensitivity analysis that estimates the impact of not meeting SRs IE-B3, IE-C6 and HR-C1. Alternatively, show that the total LERF does not exceed 1E-05/yr when external hazards are considered, updated seismic risk estimates are used, and a sensitivity analysis is performed to estimate the impact of not meeting SRs listed above.
Please arrange a teleconference with the NRC staff to discuss this additional request. Please provide your response on the docket no later than 30 days from the receipt of this request.
Thanks Mahesh Chawla Project Manager Phone: 301-415-8371
Fax: 301-415-1222 mahesh.chawla@nrc.gov
Hearing Identifier: NRR_PMDA Email Number: 2706 Mail Envelope Properties (Mahesh.Chawla@nrc.gov20160314085900)
Subject:
Second Round RAIs - Duane Arnold Energy Center - LAR (TSCR-143) to Extend Containment Leakage Test Frequency - MF6619 Sent Date: 3/14/2016 8:59:24 AM Received Date: 3/14/2016 8:59:00 AM From: Chawla, Mahesh Created By: Mahesh.Chawla@nrc.gov Recipients: "Reisifard, Mehdi" <Mehdi.Reisifard@nrc.gov> Tracking Status: None "Rosenberg, Stacey" <Stacey.Rosenberg@nrc.gov> Tracking Status: None "Wrona, David" <David.Wrona@nrc.gov>
Tracking Status: None "Steffes, Jakob" <Jakob.Steffes@nrc.gov> Tracking Status: None "Norton, Charles" <Charles.Norton@nrc.gov> Tracking Status: None "Stoedter, Karla" <Karla.Stoedter@nrc.gov>
Tracking Status: None "Phillips, Charles" <Charles.Phillips@nrc.gov> Tracking Status: None "laura.swenzinski@nexteraenergy.com" <laura.swenzinski@nexteraenergy.com> Tracking Status: None "Davis, J.Michael (J.Michael.Davis@nexteraenergy.com)" <J.Michael.Davis@nexteraenergy.com> Tracking Status: None "Cross, William (WILLIAM.CROSS@fpl.com)" <WILLIAM.CROSS@fpl.com> Tracking Status: None Post Office: Files Size Date & Time MESSAGE 6695 3/14/2016 8:59:00 AM
Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date: Recipients Received:
1NRR-PMDAPEm Resource From:Chawla, Mahesh Sent:Monday, March 14, 2016 8:59 AM To:laura.swenzinski@nexteraener gy.com; Davis, J.Michael (J.Michael.Davis@nexteraenergy.com); Cross, William (WILLIAM.CROSS@fpl.com)
Cc:Reisifard, Mehdi; Rosenberg, Stacey; Wrona, David; Steffes, Jakob; Norton, Charles; Stoedter, Karla; Phillips, Charles
Subject:
Second Round RAIs - Duane Arnold Ener gy Center - LAR (TSCR-143) to Extend Containment Leakage Test Frequency - MF6619In a letter dated August 18, 2015, (Agencywide Documents Access and Management System (ADAMS) Accession No. ML15246A445), as supplemented by letter dated January 29, 2016 (ADAMS Accession No. ML16034A031), NextEra Energy Duane Arnold, LLC requested an amendment to Duane Arnold Energy Center (DAEC) Technical Specifications (TS). The proposed amendment will revise DAEC TS Section 5.5.12, "Primary Containment Leakage Rate Testing Program," to allow extension of the Type A test interval up to one test in 15 years and extension of the Type C test interval up to 75 months.
The Probabilistic Risk Assessment Licensing Branch issued Request for Additional Information (RAI) by letter dated November 24, 2015 (ADAMS Accession No. ML15327A476) and the licensee provided responses to the RAI in letter dated January 29, 2016. The NRC staff has reviewed the responses and has determined that additional information is needed for the staff to complete its evaluation. The request for additional information is
provided as below:
Second Round of Request for Additional Information Regarding Duane Arnold Energy Center Request to Permanently Extend the Integrated Leak Rate Test Frequency to 15 Years In an electronic communication dated December 15, 2015, the NRC staff requested a list of all findings from the past peer reviews and self-assessments relevant to the Integrated Leak Rate Test (ILRT) extension submittal, dated August 18, 2015, for which the internal events probabilistic risk assessment (PRA) did not meet the American Society of Mechanical Engineers (ASME) PRA Standard Capability Category (CC) I supporting requirements (SRs) and requested the licensee to summarize why not meeting each CC I
requirement would have no impact on this application (PRA request for additional information (RAI)-1.b). In response to PRA RAI-1.b, the licensee identified five SRs, IE-B3, IE-C6, HR-A1, HR-A2 and HR-C1, which were assessed as not meeting CC I. The licensee further discussed the impact of findings associated with those SRs on the Duane Arnold Energy Center (DAEC) containment leakage test frequency extension request in Table 1 of the response.
In discussing the impact of not meeting SRs IE-B3 and IE-C6, the licensee stated, in part, that:
Substantial margin to the guidelines contained in Regulatory Guide 1.174 have been demonstrated for this ILRT test interval extension request with respect to acceptable changes in [large early release frequency] LERF. ... Change in the Type A ILRT test interval from the three in ten years to one in fifteen years is conservatively estimated to represent a 2.57E-08/yr increase in LERF. Postulated increase in baseline values of [core damage frequency] CDF and LERF result in approximately the same fractional increase in the calculated delta-LERF for this application. For example, a large increase in baseline CDF and LERF, such as 10 percent, would translate into an increase in delta-LERF of about 10 percent, resulting in a final delta-LERF that is still well below the 1E-07 criteria for which the impact of the requested ILRT testing extension is considered to be very small. As such, these criteria would also 2not be exceeded by inclusion of additional initiators in the PRA as required for closure of this Peer Review item.
In discussing the impact of not meeting SR HR-C1, the licensee stated that:
The impact of evaluating pre- initiators at the train level instead of the system level, or at the system level instead of the train level, is judged to have little or no impact on baseline values of CDF and LERF. Even if the actual impact of addressing this gap is more than minor, the change translates into only a small reduction in margin to criteria established for the ILRT testing interval extension application as described earlier with respect to finding IE-B3-01A. As such, the conclusions of the risk evaluation performed for this application are not changed by this variance from the standard.
The estimated increase in LERF of 2.57E-08/yr does not include the risk from external events. In the original submittal, the licensee estimated the total increase in LERF from both internal and external events as 8.14E-08/yr. Furthermore, this impact estimate (from both external hazards and internal events) provided in the original submittal does not include the new seismic hazard CDF and LERF estimates, which were provided in response to PRA RAI-2. The new seismic CDF estimate in response to PRA RAI-2 is larger than the seismic CDF estimate in the original submittal by more than a factor of 8. Although the licensee provided an estimate change in LERF of 6.80E-08/yr in response to PRA RAI-2 when providing the new seismic CDF estimate, this change in LERF estimate does not appear to include the risk from other external hazards or internal events.
The NRC staff believes that the change in LERF could increase to a value greater than 1E-07/yr when the impact from external events is considered, the new seismic CDF and LERF estimates from response to PRA RAI-2 are used, and the findings related to IE-B3, IE-C6, and HR-C1 are resolved. For a change in LERF greater than 1E-07/yr, the licensee should provide total LERF and demonstrate that the RG 1.174 guidelines are met. The licensee provided total LERF estimate of 9.79E-06/yr in the original submittal. Again, this estimate could exceed the guideline value of 1E-05/yr once the new seismic risk estimates are considered and the findings associated with the above SRs are resolved.
In summary, the NRC staff does not find the information provided by the licensee in the original submittal and in response to PRA RAIs to be sufficient for determining that the change in LERF is less than 1E-07/yr (to meet the guidelines of RG 1.174 Region III) or the total LERF is less than 1E-05/yr (to meet the guidelines of RG
1.174 Region II).
Show that the change in LERF does not exceed 1E-07/yr by including the impact of external hazards, using updated seismic risk estimates and providing a sensitivity analysis that estimates the impact of not meeting SRs IE-B3, IE-C6 and HR-C1. Alternatively, show that the total LERF does not exceed 1E-05/yr when external hazards are considered, updated seismic risk estimates are used, and a sensitivity analysis is performed to estimate the impact of not meeting SRs listed above.
Please arrange a teleconference with the NRC staff to discuss this additional request. Please provide your response on the docket no later than 30 days from the receipt of this request.
Thanks Mahesh Chawla Project Manager Phone: 301-415-8371
Fax: 301-415-1222 mahesh.chawla@nrc.gov
Hearing Identifier: NRR_PMDA Email Number: 2706 Mail Envelope Properties (Mahesh.Chawla@nrc.gov20160314085900)
Subject:
Second Round RAIs - Duane Arnold Energy Center - LAR (TSCR-143) to Extend Containment Leakage Test Frequency - MF6619 Sent Date: 3/14/2016 8:59:24 AM Received Date: 3/14/2016 8:59:00 AM From: Chawla, Mahesh Created By: Mahesh.Chawla@nrc.gov Recipients: "Reisifard, Mehdi" <Mehdi.Reisifard@nrc.gov> Tracking Status: None "Rosenberg, Stacey" <Stacey.Rosenberg@nrc.gov> Tracking Status: None "Wrona, David" <David.Wrona@nrc.gov>
Tracking Status: None "Steffes, Jakob" <Jakob.Steffes@nrc.gov> Tracking Status: None "Norton, Charles" <Charles.Norton@nrc.gov> Tracking Status: None "Stoedter, Karla" <Karla.Stoedter@nrc.gov>
Tracking Status: None "Phillips, Charles" <Charles.Phillips@nrc.gov> Tracking Status: None "laura.swenzinski@nexteraenergy.com" <laura.swenzinski@nexteraenergy.com> Tracking Status: None "Davis, J.Michael (J.Michael.Davis@nexteraenergy.com)" <J.Michael.Davis@nexteraenergy.com> Tracking Status: None "Cross, William (WILLIAM.CROSS@fpl.com)" <WILLIAM.CROSS@fpl.com> Tracking Status: None Post Office: Files Size Date & Time MESSAGE 6695 3/14/2016 8:59:00 AM
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