Letter Sequence Meeting |
---|
|
Initiation
- Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request
- Acceptance...
- Supplement, Supplement
Administration
- Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting
|
MONTHYEARML0515100172005-05-31031 May 2005 Draft RAI on Response to Generic Letter 2004-02 Project stage: Draft RAI ML0515303042005-06-0303 June 2005 6/3/05, Calvert Cliffs - RAI Potential Impact of Debris Blockage on Emergency Sump Recirculation at Pressurized-Water Reactors Project stage: RAI ML0603803582006-02-0909 February 2006 RAI, Response to Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design-Basis Accidents at Pressurized-Water Reactors Project stage: RAI ML0609500512006-04-12012 April 2006 Approval of Extension Request for Completion of Corrective Actions in Response to Generic Letter 2004-02 Project stage: Other ML0618702222006-06-30030 June 2006 Calvert Cliffs, Units 1 & 2 Update of Response to Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Basis Accidents at Pressurized Water Reactors Project stage: Other ML0626405472006-09-20020 September 2006 Update of Response to Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactors Project stage: Other ML0633407022006-12-18018 December 2006 Unit No.1 - Approval of Extension Request for Completion of Corrective Action in Response to Generic Letter 2004-02 Project stage: Other ML0712703722007-05-0202 May 2007 Calvert Cliffs Revision to Generic Letter 2004-02 Response Project stage: Other ML0734504992007-12-10010 December 2007 Attachment (1) Request for Extension of the Completion Date for Corrective Actions Related to Generic Letter 2004-02 Project stage: Request ML0734504982007-12-10010 December 2007 Request for Extension for Completion of Activities Related to Generic Letter 2004-02 Project stage: Request ML0811307392008-04-22022 April 2008 Revision to Generic Letter 2004-02 Response Project stage: Other ML0817101052008-06-18018 June 2008 Attachment 1, Request for Extension of the Completion Date for Corrective Actions Related to Generic Letter 2004-02 Project stage: Request ML0827404972008-09-30030 September 2008 Calvert Cliffs Nuclear Plant, Attachment 2, ECCS and CS System Figures Project stage: Other ML0827404892008-09-30030 September 2008 Supplemental Response to Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized Water Reactors. Project stage: Supplement ML0833003202008-12-0404 December 2008 Request for Additional Information Supplemental Response to Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized Water Reactors-Calvert Cliffs Unit 1 & 2 Project stage: RAI ML0906807672009-03-0404 March 2009 Request for Additional Information: Supplemental Response to Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized Water Reactors Project stage: Supplement ML1009500782010-04-12012 April 2010 Request for Additional Information Generic Letter 2004-02 Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2-(TAC Nos. MC4672 and MC4673) Project stage: RAI ML1011903842010-05-0606 May 2010 Notice of Forthcoming Conference Call with Calvert Cliffs to Discuss Supplemental Responses to Generic Ltr. 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized Water Reactors Project stage: Request ML1014708982010-06-0707 June 2010 Summary of Meeting with Calvert Cliffs Nuclear Power Plant, LLC, to Discuss Supplement to Responses to Generic Letter 2004-02 Project stage: Meeting ML1028701002010-09-30030 September 2010 Catawba Units 1 & 2, Draft Responses to NRC Request for Additional Information Related to Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents on Pressurized-Water.... Project stage: Request ML1029306502010-10-20020 October 2010 Notice of Forthcoming Conference Call with Duke Energy Carolinas, LLC Regarding McGuire Nuclear Station, Units 1 and 2 and Catawba Nuclear Station, Units 1 and 2, Project stage: Other ML1030810242010-11-10010 November 2010 Summary of November 1, 2010, Meeting with Duke to Discuss Responses to Generic Letter (GL) 2004-02 (Tac Nos. MC4673, MC4674, MC4692, and MC4693) Project stage: Meeting ML1031903612010-11-10010 November 2010 Response to Request for Additional Information Regarding Generic Letter 2004-02 (TAC Nos. MC4672 and MC4673) Project stage: Response to RAI ML13086A5512013-01-24024 January 2013 MC4672 & MC4673 - CCNPP-CHLE-003, Rev 0c Chemical Effects Pirt Considerations Excerpts with Respect to GL2004-02, GSI-191 Project stage: Other ML13038A5432013-01-24024 January 2013 Chemical Effects Head Loss Experiment (Chle) Test Protocol for Calvert Cliffs Nuclear Power Plant (CCNPP-CHLE-002, Revision 0d) Project stage: Request ML13050A5112013-02-19019 February 2013 MC4672-3 Corrected Notice -Public Meeting on March 20, 2013 Re-GL2004-02 Project stage: Request ML13045A1822013-02-19019 February 2013 March 20, 2013, Notice of Forthcoming Teleconference with Calvert Cliffs and Nrc/Nrr Staff to Have Additional Discussions of Licensees'S Proposed Path for Resolution of Generic Letter 2004-02 Project stage: Meeting ML13086A5502013-03-0101 March 2013 MC4672 & MC4673, CCNPP-CHLE-002, Rev 0e Chemical Effects Experimental Protocol with Respect to GL2004-02, GSI-191. Project stage: Request ML13088A2202013-03-18018 March 2013 MC4672 & MC4673 - CCNPP-CHLE-005, Rev 1 Chemical Effects Autoclave Experimental Plan with Respect to GL2004-02, GSI-1 91 Project stage: Request ML13086A5492013-03-20020 March 2013 MC4672 & MC4673 - Licensee Presentation-Category 1, Public Meeting on March 20, 2013 with Respect to GL2004-02, GSI-191 Project stage: Meeting ML13091A0552013-04-10010 April 2013 Summary of Meeting on March 20, 2013, with Calvert Cliffs Nuclear Power Plant, LLC, to Discuss the Proposed Risk-Informed Approach to the Resolution of Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation D Project stage: Meeting ML13149A3942013-05-20020 May 2013 Chemical Effects Head Loss Experiment (Chle) Test Protocol for Calvert Cliffs Nuclear Power Plant, CCNPP-CHLE-002, Revision 0 May 20, 2013 Project stage: Request ML13149A3992013-05-20020 May 2013 Chemical Effects Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-005, Revision 2, May 20, 2013 Project stage: Request ML13149A4052013-05-23023 May 2013 Metals BENCH-TOP Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant, CCNPP-CHLE-006, Revision 0, May 23, 2013 Project stage: Request ML13148A3962013-05-29029 May 2013 Forthcoming Meeting with Calvert Cliffs Nuclear Power Plant, LLC to Discuss Licensee'S Proposed Plan for Resolution of GL 2004-02 Project stage: Meeting ML13179A3132013-07-11011 July 2013 June 12, 2013 Summary of Meeting with Constellation Energy Group, Inc., to Continue Discussions on the Proposed Risk-Informed Approach to the Resolution of Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculati Project stage: Meeting ML13224A0942013-08-0606 August 2013 Chemical Effects Pirt Considerations for Calvert Cliffs Nuclear Power Plant, CCNPP-CHLE-003, Revision 0c Project stage: Request ML13224A1032013-08-0808 August 2013 CCNPP-CHLE-007, Revision 0c, Coatings Bench-Top Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant. Project stage: Request ML13226A0902013-08-14014 August 2013 Notice of Forthcoming Meeting with Constellation Energy Nuclear Group, LLC Project stage: Meeting ML13304B4032013-11-0101 November 2013 Notice of Forthcoming Meeting with Constellation Energy Nuclear Group, LLC, Project stage: Meeting ML13319A9392013-11-13013 November 2013 Ri GSI-191 November 2013 Meeting with NRC Rev 0 Project stage: Request ML13310B9292013-12-0606 December 2013 Summary of Meeting with Constellation Energy Group, Inc., to Continue Discussions on the Proposed Risk-Informed Approach to the Resolution of Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During ... Project stage: Meeting ML14014A0392014-01-29029 January 2014 Summary of Meeting with Constellation Energy Group, Inc., to Continue Discussions on the Proposed Risk-Informed Approach to the Resolution of Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During.. Project stage: Meeting ML14206B0012014-02-14014 February 2014 Long-Term Chemical Effects Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant. CCNP-CHLE-011, Revision 2 Project stage: Request ML14142A3232014-05-22022 May 2014 NRR E-mail Capture - Calvert Cliffs May 21, 2014 Public Meeting Presentation Project stage: Request ML14206A9932014-07-25025 July 2014 Conrete Bench-Top Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant. CCNPP-CHLE-010, Revision 1 Project stage: Request ML14206B1442014-11-0606 November 2014 May 21, 2014 Summary of Meeting with Exelon Generation Company, LLC, to Continue Discussions on the Proposed Risk-Informed Approach to the Resolution of Generic Letter 2004-02 Project stage: Meeting ML14206A2062014-11-0707 November 2014 July 2, 2014 Summary of Meeting with Exelon Generation Company, LLC to Continue Discussions on the Proposed Risk-Informed Approach to the Resolution of Generic Letter 2004-02 Project stage: Meeting ML15154B5572015-06-17017 June 2015 May 19, 2015 Summary of Meeting with Exelon Generation Company, LLC, on Calvert Cliffs Nuclear Power Plant, Units 1 and 2 - Chemical Effects Testing for Resolution of Generic Letter 2004-02 (TAC Nos. MC4672 & MC4673) Project stage: Meeting ML15222A5472015-08-31031 August 2015 GSI 191 Program Chemical Effects Testing Update Option 2b Closure Approach Project stage: Request 2013-11-01
[Table View] |
|
---|
Category:Meeting Summary
MONTHYEARML23352A0592024-01-0909 January 2024 Summary of December 11, 2023, Meeting with Constellation on Alternative Request Involving Carbon Fiber Reinforced Polymer Composite ML23320A2472023-11-17017 November 2023 Constellation - Summary of November 14, 2023, Public Pre-Application Meeting with Constellation Energy Generation, LLC on Adoption of TSTF-591 ML23263B1062023-09-22022 September 2023 R. E. Ginna Nuclear Power Plant - Constellation - Pre-Application Amse 9/18/2023 Meeting Summary ML23179A0012023-06-28028 June 2023 6/7/2023 - Annual Assessment Meeting for Pa/Md/Ny/Nj Nuclear Power Plants - Meeting Summary ML23055A0352023-03-24024 March 2023 Summary of February 23, 2023, with Constellation Energy Generation, LLC on Proposed Changes to Emergency Plans to Revise Emergency Action Levels ML23033A6662023-02-0909 February 2023 Summary of Public Meeting with Constellation Energy Generation, LLC (Constellation) to Discuss Its Request for Alternatives for Certain Steam Generator Weld Inspections for Calvert Cliffs 1 & 2, Byron 1 & 2, Braidwood 1 & 2, and Ginna ML22264A1992022-11-14014 November 2022 Summary of August 22, 2022, Meeting Between the U.S. Nuclear Regulatory Commission and Constellation Energy Generation, LLC, Regarding Performance Monitoring of Steam Generator Welds (Epids L-2022-LRR-0074, 0076, 0079, 0091, 0092, 0093 and ML22187A1462022-07-0606 July 2022 Joint Annual Assessment Meeting for Pa/Md/Nj/Ny Nuclear Power Plants - Meeting Summary ML22159A2272022-06-0808 June 2022 Summary of May 10, 2022, Pre-Application Meeting Between the U.S. Nuclear Regulatory Commission and Constellation Energy Generation, Llc, Regarding a Proposed License Amendament Request (Lar) for Calvert Cliffs Nuclear Power Plant ML22144A0202022-05-26026 May 2022 Summary of Meeting Between the U.S. Nuclear Regulatory Commission and Constellation Energy Generation, LLC, Regarding Proposed Alternative for Examinations of Certain Pressurizer Welds at Calvert Cliffs ML22066A0012022-03-22022 March 2022 Summary, January 10, 2022, Closed Meeting with Exelon Generation Company, Llc, Proposed Relief Request for Alternative Repair of Buried Saltwater Piping with Carbon Fiber Reinforced Polymer Composite System ML21333A1532021-11-30030 November 2021 Summary of November 16, 2021, Meeting with Exelon Generation Company, LLC Regarding a Planned Request for an Alternative to Extend the Inservice Inspection Interval ML21237A0412021-08-30030 August 2021 Summary of the July 27, 2021, Meeting with Exelon Generation Company, LLC Regarding a Planned Request to Use Case OMN-28, ML21228A0742021-08-27027 August 2021 Summary of July 13, 2021, Meeting with Exelon Generation Company, LLC Concerning License Amendment Request for Calvert Cliffs Nuclear Power Plant, Units 1 and 2, Concerning Spent Fuel Pool Cooling Design Basis Change (L-2021-LLA-0112) ML21176A0822021-07-0606 July 2021 June 15, 2021, Summary of Meeting with Exelon Generation Company, LLC Vessel Nozzle Repair Related to a Planned Request for an Alternative Related to Reactor Pressure ML21161A1082021-06-25025 June 2021 Summary of Pre-Application Meeting with Exelon Generation Company, LLC on Planned Submittal of License Amendment Request for Calvert Cliffs Nuclear Power Plant, Units 1 and 2, Concerning Spent Fuel Pool Cooling Design Basis Change ML21139A1852021-06-22022 June 2021 Summary of Meeting with Exelon Generation Company, LLC Regarding Its Requested Alternative to Eliminate Certain Documentation Requirements for the Replacement of Pressure Retaining Bolting ML21011A2822021-01-21021 January 2021 Summary of January 6, 2021, Presubmittal Meeting Between the NRC and Exelon Generation Company, LLC Regarding Licensing Activities to Support the Planned Early Closures of Byron, Unit Nos. 1 and 2 and Dresden, Units 2 and 3 ML20351A2832020-12-18018 December 2020 Summary of Meeting with Exelon Generation Company, LLC Regarding a Planned Request for an Exemption to Reduce the Frequency of Updates to Its Inservice Testing and Inspection Programs ML20342A3522020-12-10010 December 2020 Summary of November 13, 2020, Meeting with Exelon Generation Company, LLC Regarding a Planned Request for an Alterantive to Certain Documentation Requirements for the Replacement of Pressure Retaining Bolting (EPID-L-2020-LRM-0102) ML20323A0332020-12-0101 December 2020 Summary of November 4, 2020, Meeting with Exelon Generation Company, LLC Regarding a Planned Request for an Alternative to Reduce the Frequency of Updates to Its Inservice Testing and Inspection Programs ML20272A0132020-10-0707 October 2020 Summary of September 3, 2020, Meeting with Exelon Generation Company, LLC Concerning Supplemental Position Indication Testing Interval Alternative Request ML20197A2722020-07-15015 July 2020 2020 Beaver Valley, Calvert Cliffs, Limerick Peach Bottom, Susquehanna Annual Assessment Webinar Summary ML20181A0002020-06-29029 June 2020 Summary of 6/24/20 Meeting with Exelon Generation Company, LLC Regarding Planned Request for Alternative to Supplemental Valve Position Indication Testing Requirements for Braidwood, Calvert Cliffs, Clinton, Limerick, Nine Mile, Peach Botto ML19326A3152019-12-0303 December 2019 Summary of November 18, 2019, Meeting with Exelon Generation Company, LLC Regarding a Planned Request for an Alternative to Supplemental Valve Position Indication Testing Requirements ML19326C3582019-12-0303 December 2019 Summary of November 20, 2019, Meeting with Exelon Generation Company, LLC Regarding a Planned Request to Revise the Quality Assurance Program ML19162A0272019-06-21021 June 2019 Summary of June 4, 2019, Meeting with Exelon Generation Company, LLC Regarding a Planned Request to Extend the Test Interval for Safety Relief Valves ML19136A2752019-05-15015 May 2019 Aam 2019 Meeting Summary ML19135A1052019-05-15015 May 2019 Aam Summary Data Sheet of 2018 Plant Performance ML20108F0902019-04-20020 April 2019 April 15, 2020, Meeting Summary with Exelon Generation Company, LLC Regarding Planned Request to Defer Submittal of Owner'S Activity Report (Braidwood 2,Byron 2,Calvert Cliffs 1, LaSalle 1, Limerick 1, Nine Mile Point 2, Quad 2, R. E. Ginna ML19036A8832019-02-0707 February 2019 Summary of Meeting with Exelon Generation Company, LLC Regarding a Planned Request to Use ASME Code Case N-879 ML18354B1712019-01-0202 January 2019 Summary of December 19, 2018, Meeting with Exelon Generation Company, LLC Regarding the Use of Boiling Water Reactor Vessel and Internals Project Guidelines ML18325A1712018-11-28028 November 2018 Summary of Meeting with Exelon Generation Company, LLC Regarding Planned Fleet License Amendment Request to Revise Technical Specifications for High Radiation Areas ML18292A8202018-10-24024 October 2018 October 4, 2018, Summary of Pre-Application Meeting with Exelon Generation Co., LLC on Planned Submittal of Licensing Action for Calvert Cliffs Nuclear Power Plant, Units 1 and 2, Risk-Informed Categorization and Treatment ML18197A2292018-07-20020 July 2018 Summary of Meeting with Exelon Generation Company, Llc, on Planned Submittal of Risk Informed License Amendment and Exemption Requests Concerning Resolution of Generic Issue 191 (CAC Nos. MF8521 and MF8522; EPID L-2016-LRM-0001) ML18197A4362018-07-18018 July 2018 May 21, 2018, Summary of Meeting with Exelon Generation Company, LLC, on Planned Submittal of Risk-Informed License Amendment and Exemption Requests Concerning Resolution of Generic Issue 191 ML18191A9962018-07-13013 July 2018 Plants, - Summary of June 14, 2018, Meeting with Exelon Generation Company, LLC, on Planned Submittal of License Amendments Concerning Alternating Current Sources and Control Room Emergency Ventilation System ... ML18120A1772018-05-0101 May 2018 Summary of Meeting with Exelon Generation Company, LLC Regarding Draft Guidance for Emergency Response Organization Staffing ML18096B0782018-04-12012 April 2018 Summary of Meeting with Exelon Generation Company, LLC, on Planned Submittal of License Amendments Concerning Emergency Operation Facility and Technical Support Center (EPID L-20118-LRM-0016) ML18096B1982018-04-0606 April 2018 Summary of Public Annual Assessment Meeting Calvert Cliffs Nuclear Power Plant Dated April 6, 2018 ML18065A8362018-03-0707 March 2018 Summary of February 27, 2018, Meeting with Exelon Generation Company, LLC Planned Fleet License Amendment Request to Relocate Staff Qualification Requirements from TSs to the Quality Assurance Topical Report ML18058A5232018-03-0101 March 2018 Summary of February 26, 2018, Meeting with Exelon Generation Company, LLC Regarding Proposed Alternative to the Main Steam Isolation Valve Testing Requirements ML17249A3202017-09-18018 September 2017 Summary of Meeting with Exelon Generation Company, LLC, on Planned Submittal of Risk-Informed License Amendment and Exemption Requests Concerning Resolution of Generic Issue 191 ML17184A0092017-07-10010 July 2017 Summary of June 29, 2017, Meeting with Exelon Generation Company, LLC, on Proposed Changes to Emergency Plans to Revise Emergency Action Levels (CAC Nos. MF9779-MF9801) ML17143A3572017-05-23023 May 2017 Summary of Public Meeting Calvert Cliffs Nuclear Plant ML16228A0622016-08-15015 August 2016 Summary of July 26, 2016, Public Meeting on Status of Associated Effects Submittals Related to the Reevaluated Flood Hazards at Exelon Generation Company, LLC Sites as Part of the Response to Near-Term Task Force Recommendation 2.1, Floodin ML16118A1322016-04-26026 April 2016 4/21/2016 - Summary of Annual Assessment Meeting for Calvert Cliffs Nuclear Power Plant ML16117A1972016-04-21021 April 2016 4/21/2016 - Calvert Cliffs Nuclear Power Plant, Units 1 and 2, Annual Assessment Meeting, and Sign-in Sheet and Summary Data Sheet ML16075A4562016-04-12012 April 2016 February 24, 2016, Summary of Meeting with Exelon Generation Company, LLC, to Discuss the Flaw Indication in the Calvert Cliffs Unit 1 Pressurizer Safety Valve Dissimilar Metal Weld ML16085A3292016-04-0606 April 2016 Summary of March 22, 2016, Meeting with Exelon Generation Company, LLC, on Proposed License Amendment Request to Adopt ANSI 3.1-2014 Operating Training Standards 2024-01-09
[Table view] |
Text
REGuZq>-0;;,. UNITED STATES NUCLEAR REGULATORY COMMISSION
/!! <I: C"> 0 WASHINGTON, D.C. 20555-0001 t;; April 10, 2013 i'J') ****.. LICENSEE:
Calvert Cliffs Nuclear Power Plant, LLC Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2
SUMMARY
OF ADDITIONAL CATEGORY 1, PUBLIC MEETING ON MARCH 20,2013, WITH CALVERT CLIFFS NUCLEAR POWER PLANT, LLC, TO DISCUSS THE PROPOSED RISK-INFORMED APPROACH TO THE RESOLUTION OF GENERIC LETTER 2004-02, "POTENTIAL IMPACT OF DEBRIS BLOCKAGE ON EMERGENCY RECIRCULATION DURING DESIGN BASIS ACCIDENTS AT PRESSURIZED-WATER REACTORS" (TAC NO. MC4672 AND MC4673) On March 20,2013, a Category 1 public meeting was held between the U.S. Nuclear Regulatory Commission (NRC) and representatives of Calvert Cliffs Nuclear Power Plant (CCNPP), LLC, the licensee, at NRC Headquarters, Rockville, Maryland.
The purpose of the meeting was to continue the discussion of the licensee's proposed risk-informed approach to the resolution of Generic Letter (GL) 2004-02, "Potential Impact of Debris Blockage on Emergency Recirculation during DeSign Basis Accidents at Pressurized-Water Reactors (PWRs)" for Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2 (Calvert Cliffs). This meeting was a continuation of the discussion that took place in the Category 1, Public Tele-conference on January 8,2013. The licensee's presentation material is provided in Enclosure 2 to this meeting summary. The licensee (1) presented an overview of Calvert Cliffs' risk-informed approach and forecasted schedule to the resolution of GL 2004-02; (2) discussed the licensee's risk-informed approach versus previous NRC accepted methodologies for deterministic calculations and compared its approach to how South Texas Project (STP) is proceeding forward; and (3) continued the discussion of the Calvert Cliffs chemical effects head loss considerations.
The CCNPP expressed its deSires to have monthly discussions from this point moving forward in order to adhere to the proposed testing schedule.
The NRC staff responded that they would like to talk when there is a "step-change" in the test plans, and the deterministic vs. Risk Informed (RI) considerations are included in the documentation.
NRC will review the document CHLE-005 (which will be publicly available as part of the meeting summary), and determine the most appropriate way to provide feedback.
Tim Sande, a public attendee, asked for clarification on how a deterministic margin is quantified vs. how a risk-informed approach test is quantified.
The NRC responded by stating that there are a number of different ways to build in margin, and the NRC is more than willing to entertain different approaches.
However they would need additional details in order to properly comment on them.
2 A list of attendees is provided as Enclosure 1, but may not be all inclusive.
The licensee's presentation slides are provided in ADAMS Accession No. ML13086A549 and the summary discussions is provided in Enclosure Members of the public were in attendance.
Public Meeting Feedback forms were not Please direct any inquiries to me at 301-415-3308, or Bhalchandra K. Project Manager Plant Licensing Branch 1-1 Division of Operating Reactor licensing Office of Nuclear Reactor Regulation Docket Nos. 50-317 and 50-318
Enclosure:
- 1. List of Attendees
- 2. Summary of Discussions cc w/encl: Distribution via Listserv Bailey . -_..
LIST OF MARCH ADDITIONAL MEETING WITH CALVERT CLIFFS NUCLEAR POWER PLANT, RISK-INFORMED APPROACH TO THE RESOLUTION OF GL CALVERT CLIFFS NUCLAR POWER PLANT. UNIT NOS. 1 AND : ORGANIZATION
......_..........NRCNRRIDE I NRC/NRR/DE
,-::----.----,---.-------.-.--
........--.-.-...----........--.-..'--'---"jN R I Gloria Kulesa j MPR Associates, Inc.
..*--------..
..-**..*--r*--------*--****-**-*-*
...i Enercon Services.
Inc. (Public Participant)
Zigler(*)
Services, Inc. (Public Participant) 1"""'"[T-o-m-K-on-e-rt-h----------**
..*--------r Calvert Cliffs .*.-...--. Andrew Henni I Bob Peterson I Peter Wi Ikens(*y-*---------**u-
.... Amanda Harrison(*)
I Andrew E. Kauffman(*)
Calvert Cliffs ..... -------.--
......., .._..._-_.-........... Sargent & Lundy LLC -.....--.. ---..... .
(*) by Toll-Free line Enclosure 1
SUMMARY
OF DISCUSSIONS CATEGORY 1, PUBLIC MEETING ON MARCH 20, 2013 G12004-02, GSI 191 1) The licensee indicated that a number of steps were being taken to support resolution of GSI-191 at Calvert Cliffs including replacement of some fibrous insulation (roughly 80 percent of the mineral wool) with reflective metallic insulation, enlarging refueling pool cavity drains, removal of aluminum sources from containment, installation of instrumentation to monitor emergency core cooling system suction temperature and operational changes to control post-LOCA sump temperatures.
In addition, the plant is performing the engineering for removal of additional fibrous insulation, if needed to resolve the issue. 2) The licensee indicated additional strainer testing was performed in 2010 that was not submitted to the NRC. The additional tests with the proposed post-2018 plant configuration had a total head loss, including chemical effects, approximately 7 times lower than the earlier strainer tests. In addition to a change in the test debris amounts, the licensee indicated that the 2010 strainer tests were performed with a slower addition of WCAP-16530 precipitates compared to the earlier tests. 3) The staff stated that the licensee's path forward is not clear, such as whether a deterministic or risk-informed solution was being pursued. The licensee stated that they hoped to show deterministically that strainer head loss and in-vessel effects would be acceptable based on decreased chemical effects. The licensee, however, is going to begin their evaluation using a risk-informed approach.
- 4) The staff indicated that it would be difficult to review and provide feedback on the licensee's methods without knowing more details concerning the licensee's approach.
For example, the staff would have different expectations for a risk-informed approach as compared to a deterministic approach.
- 5) The licensee and staff discussed a number of items related to chemical effects testing. Since the test plan is still under development, the staff and licensee will continue the discussion when details become available.
- a. The licensee agreed that they would ensure the sensitivity and reproducibility of any "detector bed" used in long-term testing. b. Test details such as quantities of materials, pH profile, temperature profile, flow past test materials, cooling during the final part of the test, interpretation of test results, and repeatability are important features that the NRC staff will consider in the overall evaluation.
- c. The licensee stated that they are currently contracting to build a chemical test facility in which to perform the testing. Enclosure 2
-The licensee stated that they were currently working on getting some preliminary dissolution tests performed using autoclaves to evaluate the highest temperature portion of the test. The licensee stated that they would like to have staff feedback on the procedure being used. The licensee provided the procedure (CHLE-005) to the NRC staff during the meeting. Licensee document CCNPP-CHLE 002, "Chemical Effects Head Loss Experiment (CHLE) Protocol for Calvert Cliffs Nuclear Power Plant," discussed a proposed method for applying chemical effects head loss from a long term vertical head loss loop test with a "detector bed" to reduce the conservatism of chemical effects head loss measured during strainer tests with WCAP-16530 precipitate addition.
The NRC staff indicated that it may consider such an approach but more details would need to be available before the staff could perform an evaluation.
Some guiding principles that the staff would use to evaluate this type of approach would include: (i) confidence exists that the limiting precipitate formed during representative testing results in less chemical head loss impact than the limiting chemical head loss impact from testing with WCAP precipitate; (ii) confidence exists that the detector bed head loss is similar or conservative with respect to chemical effects impact over the range of potentially limiting plant-specific debris beds; (iii) phenomenological (e.g., chemistry) and other uncertainties are adequately accounted in the overall assessment.
For example, the NRC staff expects the following information would be provided to help the staff better understand the proposed approach: Results from all strainer tests with WCAP precipitate such that the baseline head loss and head loss due to chemical precipitate addition during strainer tests is well understood. Results from detector bed shakedown testing that show the baseline head loss is stable and reproducible. Test results demonstrating the detector bed is at least as sensitive to chemical precipitates as the debris beds that formed during plant-specific strainer tests. Details concerning how the chemical head loss from the proposed long-term tests with plant materials would be applied to the strainer tests with WCAP precipitate. A discussion of how the uncertainties related to post-LOCA chemical effects are accounted for, as applicable, in either a deterministic or risk-informed approach. In response to a statement in licensee document CHLE-002, the NRC staff stated that it would not be appropriate to ignore a chemical effects head loss increase less than 10 percent of the long-term test baseline head loss. The licensee discussed how piping less than 2 inches in diameter would be addressed.
Currently, it is not planned to include piping below 2 inches in the evaluation.
However, for larger piping, all size breaks will be considered from a 'Y2 inch
-3 hole size up to and including a double-ended guillotine break. The staff stated that the licensee approach will be discussed with cognizant NRC staff that were not at the meeting to determine if the licensee's methodology is adequate. The licensee and staff discussed the assumptions used for the transport evaluation.
The licensee noted that some of the assumptions used by STP for their risk-informed pilot were not yet reviewed and accepted by the staff. The licensee stated that they intended to use transport methods that had been approved by the NRC staff. The staff and licensee discussed how outstanding chemical effects PIRT issues could be addressed in their testing and evaluation.
The NRC staff noted, in general, that chemical effects evaluations that contain greater margin will need to address fewer PIRT issues. The staff and licensee agreed on the path forward for most of the PIRT issues. The staff clarified that an agreement that "testing can address a PIRT item" does not necessarily mean the issue is resolved since the test details become important to addressing the issue. The NRC staff stated that they need further internal discussions on Items 5.1 Inorganic Agglomeration and 6.2 Organic Agglomeration.
The NRC staff also stated that they consider a number of the PIRT Items related to the presence of a radiological source term to be linked, with the general issue being whether the presence of a radiological source term could affect the head loss across a debris bed. The staff stated that they were unsure how additional chemical effects test results would be applied by the licensee to their plant-specific in-vessel effects, but noted that if the licensee can show the amount of fibrous debris reaching the reactor vessel core following a LOCA was within the limit specified in the NRC staff's Safety Evaluation Report for WCAP-16793, this should not be an issue. The licensee stated that they were planning on performing bypass testing to determine inputs for downstream evaluations.
This is acceptable to the NRC staff. The staff also stated that the licensee may consider contacting the Salem Plant because the staff had agreed with Salem representatives that it was possible for them to use previous bypass test results. The staff questioned whether the licensee's debris preparation procedures for fibrous and particulate debris would result in realistic surrogates.
The licensee is considering the appropriate methods to prepare the debris.
-4 REFERENCE DOCUMENTS: CCNPP-CHLE-001, Revision Oc, "Chemical Effects Head Loss Experiment (CHLE) Test Plan for Calvert Cliffs Nuclear Power Plant." ML13038A487
-Endorsement of NEI 10-07. (ML13035A453) CCNPP-CHLE-002, Revision Oe, "Chemical Effects Head Loss Experiment (CHLE) Test Protocol for Calvert Cliffs Nuclear Power Plant." (ML13086A550). CCNPP-CHLE-003, Revision Oc "Chemical Effects PIRT Considerations for Calvert Cliffs Nuclear Power Plant." (ML13086A551) CCNPP-CHLE-005, Revision 1, "Chemical Effects Autoclave Experimental Plan for Calvert Cliffs Nuclear Power Plant." (ML13088A220) Calvert Cliffs Nuclear Power Plant, Units 1 and 2 -PIRT Item Summary. (ML13038A604)
A list of attendees is provided as Enclosure 1, but may not be all inclusive.
The licensee's presentation slides are provided in ADAMS Accession No. ML13086A549 and the summary of discussions is provided in Enclosure
- 2. Members of the public were in attendance.
Public Meeting Feedback forms were not received.
Please direct any inquiries to me at 301-415-3308, or Bhalchandra.Vaidya@nrc.gov.
Ira! Bhalchandra K. Project Manager Plant Licensing Branch 1-1 Division of Operating Reactor licensing Office of Nuclear Reactor Regulation Docket Nos. 50-317 and 50-318
Enclosure:
- 1. List of Attendees
- 2. Summary of Discussions cc w/encl: Distribution via Listserv DISTRIBUTION:
PUBLIC RidsOgcMailCenter lWertz, NRR LPLI-1 RlF RidsRgn1 MailCenter JCassidy, EDO Region I RidsAcrsAcnw_MailCTR SBailey, NRR RidsNrrDeEsgb RidsNrrDorl PKlein, NRR N. Morgan, NRR/DORL RidsNrrDorlLpli-1 MYoder, NRR RidsNrrPMCalvertCliffs SSmith, NRR RidsNrrLAKGoldstein RidsNrrDssSsib ADAMS Accession Nos.: Package: ML13092A198 Meeting Summary: ML13091A055 ee mg N f LM f 0 Ice: ML13050A511 P resentatlon S'd 6A549 lies: M 1308 OFFICE DORULPU-1/PM DORULPU-1/LA DE/ESGB/BC DSS/SSIB/BC DORULPLI-1/BC NAME BVaidya KGoldstein GKulesa SBailey SMeighan DATE 04/04/13 04/04/13 04/09/13 04/10/13 04/10/13 OFFICIAL RECORD COpy