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| | issue date = 06/17/2015 | | | issue date = 06/17/2015 |
| | title = 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) | | | title = 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) |
| | author name = Chereskin A N | | | author name = Chereskin A |
| | author affiliation = NRC/NRR/DORL/LPLI-1 | | | author affiliation = NRC/NRR/DORL/LPLI-1 |
| | addressee name = | | | addressee name = |
Line 9: |
Line 9: |
| | docket = 05000317, 05000318 | | | docket = 05000317, 05000318 |
| | license number = DPR-053, DPR-069 | | | license number = DPR-053, DPR-069 |
| | contact person = Chereskin A N | | | contact person = Chereskin A |
| | case reference number = TAC MC4672, TAC MC4673 | | | case reference number = TAC MC4672, TAC MC4673 |
| | document type = Meeting Summary | | | document type = Meeting Summary |
| | page count = 5 | | | page count = 5 |
| | project = TAC:MC4672, TAC:MC4673 | | | project = TAC:MC4672, TAC:MC4673 |
| | stage = Other | | | stage = Meeting |
| }} | | }} |
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| =Text= | | =Text= |
| {{#Wiki_filter:LICENSEE: Exelon Generation, LLC FACILITY: Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2 | | {{#Wiki_filter:LICENSEE: Exelon Generation, LLC FACILITY: Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2 |
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| ==SUBJECT:== | | ==SUBJECT:== |
| CALVERT CLIFFS NUCLEAR POWER PLANT UNIT NOS. 1 AND 2 -SUMMARY OF MAY 19, 2015, MEETING WITH EXELON GENERATION COMPANY, LLC, REGARDING CHEMICAL EFFECTS TESTING FOR RESOLUTION OF GENERIC LETTER 2004-02, "POTENTIAL IMPACT OF DEBRIS BLOCKAGE ON EMERGENCY RECIRCULATION DURING DESIGN BASIS ACCIDENTS AT PRESSURIZED-WATER REACTORS" (TAC NOS. MC4672 AND MC4673) On May 19, 2015, a Category 1 public meeting was held between the U.S. Nuclear Regulatory Commission (NRC) and representatives of Exelon Generation, LLC (or the licensee), at NRC Headquarters, One White Flint North, 11555 Rockville Pike, Rockville, Maryland. The purpose of the meeting was to discuss chemical effects testing for the resolution of Generic Letter (GL) 2004-02, "Potential Impact of Debris Blockage on Emergency Recirculation during Design Basis Accidents at Pressurized-Water Reactors," for the Calvert Cliffs Nuclear Power Plant (Calvert Cliffs). The meeting notice and agenda, dated May 4, 2015, is available in the Agencywide Documents Access and Management System (ADAMS) Accession No. ML 15124A804. A list of attendees is provided as Enclosure 1. The licensee presented information regarding a methodology to demonstrate head loss margin to account for chemical effects and uncertainties, a chemical effects head loss experiment (CHLE) protocol, the emergency sump strainer bypass calculation, and the status of their chemical effects testing to resolve GL 2004-02. The licensee's slides can be viewed at ADAMS Accession No. ML15140A101. The licensee presented information on the updated parameters for their document CA08075, Revision 0, "Emergency Sump Strainer Fiber Bypass" (ADAMS Accession No. ML 15096A012). The discussion focused on the bypass fractions, the amount of fiber used in the experiments, and the time it takes for the velocities across the strainer modules in the plant to equalize. The NRC staff gave the licensee feedback, as well as raised questions and concerns about certain parts of the licensee's approach to resolving GL 2004-02. Overall, the NRC staff believes that there are no major issues with the fiber bypass testing because the test methodologies and extrapolation of the results to plant conditions were conducted similarly to other licensee bypass evaluations that have been accepted by the staff. The licensee then discussed CCNPP-CHLE-017, Revision 0, "Head Loss Margin to Address Minimal Chemical Effects and Uncertainties for Calvert Cliffs Nuclear Power Plant" (ADAMS Accession No. ML 15096A010). The licensee stated that the overall approach of the head loss margin evaluation to account for chemical effects and uncertainties is to demonstrate that there are minimal chemical effects, establish debris bed head loss, and apply margin to the non-chemical head loss to account for uncertainty. The licensee also presented a comparison of the summer 2010 test runs to the current plant design basis debris load. This demonstrated that the design basis cases have higher fiber content, higher calculated precipitate load, and lower particulate load than the tested cases. The basis for the licensee's calculation of margin to account for minimal chemical effects was depicted graphically as well. Based on 2010 strainer testing, the licensee determined that chemical precipitate additions of up to approximately 10% of the bounding design precipitate load have minimal impact on pre-chemical effects debris head loss. The licensee also stated that an uncertainty factor of 4.5 times the non-chemical head loss would bound head loss increase due to "minimal chemical effects." During discussion of CHLE-017, the NRC staff questioned the licensee on which test runs would be used to establish the debris bed head loss. The staff noted that it did not agree with the statement that head loss increase due to chemical precipitates in 2010 strainer testing is more conservative than expected with the current design basis debris load. The staff noted that it is not opposed to the licensee's approach of applying margin to account for uncertainty given a minimal chemical effects test result, but more detail on the licensee's approach is needed. The staff stated that providing margin in terms of head loss rather than a bump-up factor would be easier to review. The NRC staff noted that a graph of head loss over time including annotations of significant steps or events during the test would be useful. The staff also stated that the licensee should provide the limiting criteria (e.g., head loss, deaeration) and margin during the post-LOCA mission time so that the staff could better understand the limiting plant-specific conditions. The licensee stated that all of the previous test results from 2008 and 2010 would be used to establish head loss. The licensee stated there is a calculation that better ties the results of the tests to how the conventional head loss was determined. This calculation might better help the staff understand the licensee's methodology. The licensee continued with a discussion of CCNPP-CHLE-002, Revision 0, "Chemical Effects Head Loss Experiment (CHLE) Test Protocol," for Calvert Cliffs (ADAMS Accession No. ML 15119A 129). The licensee discussed the final testing protocol for the design basis debris loads, test procedures, modifications to the test loop, and the pre-buffer borated water spray regime. A graph was presented that shows the sensitivity of the debris bed to chemical precipitate. The NRC staff agreed that these test results demonstrated sensitivity to detection of chemical precipitates. Schematics showing the layout of the testing facility were also presented. Next, the licensee presented a status of the chemical effects testing at Alden Labs. The licensee initiated the first integrated test on April 17, 2015, and the detector bed head loss immediately started to increase. The head loss increased to 10.25 feet, and was rising, when the test was terminated. The licensee observed a darker fluid in the vertical test loop, and determined from further investigation that the water contained burnt binder from the baked Nukon, degraded marinate, and degraded inorganic zinc coated coupons. Samples have been sent to a different laboratory for further chemical analysis. The NRC staff was also interested in the status of the ongoing chemical effects testing being performed by the licensee. The staff noted that when the licensee attempts to determine what caused the large head loss, it is important to correctly distinguish between conventional debris and chemical effects. The licensee and the staff agreed that it would be beneficial to have additional discussions after the analysis has been completed on the head loss test. This will allow a more useful discussion on what may have caused the large head loss during the test run, and how the licensee plans to proceed with additional testing. The licensee concluded their presentation with a brief discussion on the status of their risk-informed approach to GL 2004-02 resolution. The licensee indicated that they are scheduled to complete their risk-informed approach in 2nd quarter 2015, and that they will still pursue this even if their deterministic approach is successful. Members of the public were in attendance. Public meeting feedback forms were not received although feedback from the public was received. Comments received included: a member of the public noting that he could not hear some of the speakers over the phone. He stated that he informed the phone operator and lodged a complaint with the Commission. In addition, the member of the public queried the staff on whether foreign material was accounted for in the strainer analyses for a post loss of coolant accident. The member of the public also suggested that foreign material could cause an accident similar to the accident at Three Mile Island. Please direct any inquiries to me at 301-415-2549, or Alexander.Chereskin@nrc.gov. Docket Nos. 50-317 and 50-318 | | CALVERT CLIFFS NUCLEAR POWER PLANT UNIT NOS. 1 AND 2 - |
| | |
| | ==SUMMARY== |
| | OF MAY 19, 2015, MEETING WITH EXELON GENERATION COMPANY, LLC, REGARDING CHEMICAL EFFECTS TESTING FOR RESOLUTION OF GENERIC LETTER 2004-02, "POTENTIAL IMPACT OF DEBRIS BLOCKAGE ON EMERGENCY RECIRCULATION DURING DESIGN BASIS ACCIDENTS AT PRESSURIZED-WATER REACTORS" (TAC NOS. |
| | MC4672 AND MC4673) |
| | On May 19, 2015, a Category 1 public meeting was held between the U.S. Nuclear Regulatory Commission (NRC) and representatives of Exelon Generation, LLC (or the licensee), at NRC Headquarters, One White Flint North, 11555 Rockville Pike, Rockville, Maryland. The purpose of the meeting was to discuss chemical effects testing for the resolution of Generic Letter (GL) 2004-02, "Potential Impact of Debris Blockage on Emergency Recirculation during Design Basis Accidents at Pressurized-Water Reactors," for the Calvert Cliffs Nuclear Power Plant (Calvert Cliffs). The meeting notice and agenda, dated May 4, 2015, is available in the Agencywide Documents Access and Management System (ADAMS) Accession No. ML15124A804. A list of attendees is provided as Enclosure 1. |
| | The licensee presented information regarding a methodology to demonstrate head loss margin to account for chemical effects and uncertainties, a chemical effects head loss experiment (CHLE) protocol, the emergency sump strainer bypass calculation, and the status of their chemical effects testing to resolve GL 2004-02. The licensee's slides can be viewed at ADAMS Accession No. ML15140A101. |
| | The licensee presented information on the updated parameters for their document CA08075, Revision 0, "Emergency Sump Strainer Fiber Bypass" (ADAMS Accession No. ML15096A012). |
| | The discussion focused on the bypass fractions, the amount of fiber used in the experiments, and the time it takes for the velocities across the strainer modules in the plant to equalize. The NRC staff gave the licensee feedback, as well as raised questions and concerns about certain parts of the licensee's approach to resolving GL 2004-02. Overall, the NRC staff believes that there are no major issues with the fiber bypass testing because the test methodologies and extrapolation of the results to plant conditions were conducted similarly to other licensee bypass evaluations that have been accepted by the staff. |
| | The licensee then discussed CCNPP-CHLE-017, Revision 0, "Head Loss Margin to Address Minimal Chemical Effects and Uncertainties for Calvert Cliffs Nuclear Power Plant" (ADAMS Accession No. ML15096A010). The licensee stated that the overall approach of the head loss margin evaluation to account for chemical effects and uncertainties is to demonstrate that there are minimal chemical effects, establish debris bed head loss, and apply margin to the non- |
| | |
| | chemical head loss to account for uncertainty. The licensee also presented a comparison of the summer 2010 test runs to the current plant design basis debris load. This demonstrated that the design basis cases have higher fiber content, higher calculated precipitate load, and lower particulate load than the tested cases. The basis for the licensee's calculation of margin to account for minimal chemical effects was depicted graphically as well. Based on 2010 strainer testing, the licensee determined that chemical precipitate additions of up to approximately 10% |
| | of the bounding design precipitate load have minimal impact on pre-chemical effects debris head loss. The licensee also stated that an uncertainty factor of 4.5 times the non-chemical head loss would bound head loss increase due to "minimal chemical effects." |
| | During discussion of CHLE-017, the NRC staff questioned the licensee on which test runs would be used to establish the debris bed head loss. The staff noted that it did not agree with the statement that head loss increase due to chemical precipitates in 2010 strainer testing is more conservative than expected with the current design basis debris load. The staff noted that it is not opposed to the licensee's approach of applying margin to account for uncertainty given a minimal chemical effects test result, but more detail on the licensee's approach is needed. The staff stated that providing margin in terms of head loss rather than a bump-up factor would be easier to review. |
| | The NRC staff noted that a graph of head loss over time including annotations of significant steps or events during the test would be useful. The staff also stated that the licensee should provide the limiting criteria (e.g., head loss, deaeration) and margin during the post-LOCA mission time so that the staff could better understand the limiting plant-specific conditions. The licensee stated that all of the previous test results from 2008 and 2010 would be used to establish head loss. The licensee stated there is a calculation that better ties the results of the tests to how the conventional head loss was determined. This calculation might better help the staff understand the licensee's methodology. |
| | The licensee continued with a discussion of CCNPP-CHLE-002, Revision 0, "Chemical Effects Head Loss Experiment (CHLE) Test Protocol," for Calvert Cliffs (ADAMS Accession No. ML15119A129). The licensee discussed the final testing protocol for the design basis debris loads, test procedures, modifications to the test loop, and the pre-buffer borated water spray regime. A graph was presented that shows the sensitivity of the debris bed to chemical precipitate. The NRC staff agreed that these test results demonstrated sensitivity to detection of chemical precipitates. Schematics showing the layout of the testing facility were also presented. |
| | Next, the licensee presented a status of the chemical effects testing at Alden Labs. The licensee initiated the first integrated test on April 17, 2015, and the detector bed head loss immediately started to increase. The head loss increased to 10.25 feet, and was rising, when the test was terminated. The licensee observed a darker fluid in the vertical test loop, and determined from further investigation that the water contained burnt binder from the baked Nukon, degraded marinate, and degraded inorganic zinc coated coupons. Samples have been sent to a different laboratory for further chemical analysis. |
| | The NRC staff was also interested in the status of the ongoing chemical effects testing being performed by the licensee. The staff noted that when the licensee attempts to determine what caused the large head loss, it is important to correctly distinguish between conventional debris and chemical effects. The licensee and the staff agreed that it would be beneficial to have |
| | |
| | additional discussions after the analysis has been completed on the head loss test. This will allow a more useful discussion on what may have caused the large head loss during the test run, and how the licensee plans to proceed with additional testing. |
| | The licensee concluded their presentation with a brief discussion on the status of their risk-informed approach to GL 2004-02 resolution. The licensee indicated that they are scheduled to complete their risk-informed approach in 2nd quarter 2015, and that they will still pursue this even if their deterministic approach is successful. |
| | Members of the public were in attendance. Public meeting feedback forms were not received although feedback from the public was received. Comments received included: a member of the public noting that he could not hear some of the speakers over the phone. He stated that he informed the phone operator and lodged a complaint with the Commission. In addition, the member of the public queried the staff on whether foreign material was accounted for in the strainer analyses for a post loss of coolant accident. The member of the public also suggested that foreign material could cause an accident similar to the accident at Three Mile Island. |
| | Please direct any inquiries to me at 301-415-2549, or Alexander.Chereskin@nrc.gov. |
| | Alexander N. Chereskin, Project Manager Plant Licensing Branch 1-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-317 and 50-318 |
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| ==Enclosures:== | | ==Enclosures:== |
| 1 . List of Attendees cc w/encls: Distribution via Listserv Alexander N. Chereskin, Project Manager Plant Licensing Branch 1-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation LIST OF ATTENDEES MAY 19, 2015, MEETING WITH EXELON GENERATION, LLC TO DISCUSS CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NOS. 1, AND 2 CHEMICAL EFFECTS TESTING FOR GL 2004-02 RESOLUTION U.S. Nuclear Regulatory Commission A. Chereskin M. Yoder S. Smith P. Klein M. Diaz-Colon L. Robinson A. Guzzetta G.Kulesa A. Obodoako* J. Stang* Exelon Generation, LLC K. Greene A. Elliot Sargent and Lundy (on behalf of Exelon Generation, LLC) H. Kopke MPR Associates (on behalf of Exelon Generation, LLC) E. Federline S. Kinsey Enercon Services (on behalf of Exelon Generation, LLC) C. Sellers Members of the Public M. Lewis* T. Sande B. Stair *via teleconference Enclosure additional discussions after the analysis has been completed on the head loss test. This will allow a more useful discussion on what may have caused the large head loss during the test run, and how the licensee plans to proceed with additional testing. The licensee concluded their presentation with a brief discussion on the status of their risk-informed approach to GL 2004-02 resolution. The licensee indicated that they are scheduled to complete their risk-informed approach in 2nd quarter 2015, and that they will still pursue this even if their deterministic approach is successful. Members of the public were in attendance. Public meeting feedback forms were not received although feedback from the public was received. Comments received included: a member of the public noting that he could not hear some of the speakers over the phone. He stated that he informed the phone operator and lodged a complaint with the Commission. In addition, the member of the public queried the staff on whether foreign material was accounted for in the strainer analyses for a post loss of coolant accident. The member of the public also suggested that foreign material could cause an accident similar to the accident at Three Mile Island. Please direct any inquiries to me at 301-415-2549, or Alexander.Chereskin@nrc.gov. IRA/ Alexander N. Chereskin, Project Manager Plant Licensing Branch 1-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-317 and 50-318
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| ==Enclosures:==
| | 1 . List of Attendees cc w/encls: Distribution via Listserv |
| 1 . List of Attendees cc w/encls: Distribution via Listserv DISTRIBUTION: PUBLIC LPLl-1 R/F RidsAcrsAcnw _MailCTR RidsNrrDorllpll-1 RidsNrrPMCalvertCliffs RidsNrrLAKGoldstein RidsRgn1 MailCenter Resource RidsNrrDssSsib M. Yoder, NRR S. Smith, NRR P. Klein, NRR M. Diaz-Colon, NRR L. Robinson, NRR ADAMS Accession Nos. Meeting Notice: ML 15124A804 M.Waters, OEDO TWertz, NRR A. Obodoako, NRR RidsN rrDeEsgb J. Stang, NRR A. Guzzetta, NRR Meetina Summary: ML 15154855 an outs: 7 H d ML15140A101 OFFICE NRR/DORL/LPLl-1 /PM NRR/DORL/LPLl-1/LA NRR/DSS/SSIB NAME AChereskin KGoldstein VCusumano DATE 06/09/2015 06/09/2015 06/10/2015 OFFICE NRR/DE/ESGB NRR/DORL/LPLl-1/BC(A) NRR/DORL/LPLl-1 /PM NAME GKulesa MDudek AChereskin DATE 06/11/2015 06/17/2015 06/17/2015 OFFICIAL RECORD COPY | | |
| }} | | LIST OF ATTENDEES MAY 19, 2015, MEETING WITH EXELON GENERATION, LLC TO DISCUSS CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NOS. 1, AND 2 CHEMICAL EFFECTS TESTING FOR GL 2004-02 RESOLUTION U.S. Nuclear Regulatory Commission A. Chereskin M. Yoder S. Smith P. Klein M. Diaz-Colon L. Robinson A. Guzzetta G.Kulesa A. Obodoako* |
| | J. Stang* |
| | Exelon Generation, LLC K. Greene A. Elliot Sargent and Lundy (on behalf of Exelon Generation, LLC) |
| | H. Kopke MPR Associates (on behalf of Exelon Generation, LLC) |
| | E. Federline S. Kinsey Enercon Services (on behalf of Exelon Generation, LLC) |
| | C. Sellers Members of the Public M. Lewis* |
| | T. Sande B. Stair Enclosure |
| | *via teleconference |
| | |
| | Meeting Notice: ML15124A804 Meetina Summary: ML151548557 Han d outs: ML15140A101 OFFICE NRR/DORL/LPLl-1 /PM NRR/DORL/LPLl-1/LA NRR/DSS/SSIB NAME AChereskin KGoldstein VCusumano DATE 06/09/2015 06/09/2015 06/10/2015 OFFICE NRR/DE/ESGB NRR/DORL/LPLl-1/BC(A) NRR/DORL/LPLl-1 /PM NAME GKulesa MDudek AChereskin DATE 06/11/2015 06/17/2015 06/17/2015}} |
Letter Sequence Meeting |
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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
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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
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Category:Meeting Summary
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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. 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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
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LICENSEE: Exelon Generation, LLC FACILITY: Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2
SUBJECT:
CALVERT CLIFFS NUCLEAR POWER PLANT UNIT NOS. 1 AND 2 -
SUMMARY
OF MAY 19, 2015, MEETING WITH EXELON GENERATION COMPANY, LLC, REGARDING CHEMICAL EFFECTS TESTING FOR RESOLUTION OF GENERIC LETTER 2004-02, "POTENTIAL IMPACT OF DEBRIS BLOCKAGE ON EMERGENCY RECIRCULATION DURING DESIGN BASIS ACCIDENTS AT PRESSURIZED-WATER REACTORS" (TAC NOS.
MC4672 AND MC4673)
On May 19, 2015, a Category 1 public meeting was held between the U.S. Nuclear Regulatory Commission (NRC) and representatives of Exelon Generation, LLC (or the licensee), at NRC Headquarters, One White Flint North, 11555 Rockville Pike, Rockville, Maryland. The purpose of the meeting was to discuss chemical effects testing for the resolution of Generic Letter (GL) 2004-02, "Potential Impact of Debris Blockage on Emergency Recirculation during Design Basis Accidents at Pressurized-Water Reactors," for the Calvert Cliffs Nuclear Power Plant (Calvert Cliffs). The meeting notice and agenda, dated May 4, 2015, is available in the Agencywide Documents Access and Management System (ADAMS) Accession No. ML15124A804. A list of attendees is provided as Enclosure 1.
The licensee presented information regarding a methodology to demonstrate head loss margin to account for chemical effects and uncertainties, a chemical effects head loss experiment (CHLE) protocol, the emergency sump strainer bypass calculation, and the status of their chemical effects testing to resolve GL 2004-02. The licensee's slides can be viewed at ADAMS Accession No. ML15140A101.
The licensee presented information on the updated parameters for their document CA08075, Revision 0, "Emergency Sump Strainer Fiber Bypass" (ADAMS Accession No. ML15096A012).
The discussion focused on the bypass fractions, the amount of fiber used in the experiments, and the time it takes for the velocities across the strainer modules in the plant to equalize. The NRC staff gave the licensee feedback, as well as raised questions and concerns about certain parts of the licensee's approach to resolving GL 2004-02. Overall, the NRC staff believes that there are no major issues with the fiber bypass testing because the test methodologies and extrapolation of the results to plant conditions were conducted similarly to other licensee bypass evaluations that have been accepted by the staff.
The licensee then discussed CCNPP-CHLE-017, Revision 0, "Head Loss Margin to Address Minimal Chemical Effects and Uncertainties for Calvert Cliffs Nuclear Power Plant" (ADAMS Accession No. ML15096A010). The licensee stated that the overall approach of the head loss margin evaluation to account for chemical effects and uncertainties is to demonstrate that there are minimal chemical effects, establish debris bed head loss, and apply margin to the non-
chemical head loss to account for uncertainty. The licensee also presented a comparison of the summer 2010 test runs to the current plant design basis debris load. This demonstrated that the design basis cases have higher fiber content, higher calculated precipitate load, and lower particulate load than the tested cases. The basis for the licensee's calculation of margin to account for minimal chemical effects was depicted graphically as well. Based on 2010 strainer testing, the licensee determined that chemical precipitate additions of up to approximately 10%
of the bounding design precipitate load have minimal impact on pre-chemical effects debris head loss. The licensee also stated that an uncertainty factor of 4.5 times the non-chemical head loss would bound head loss increase due to "minimal chemical effects."
During discussion of CHLE-017, the NRC staff questioned the licensee on which test runs would be used to establish the debris bed head loss. The staff noted that it did not agree with the statement that head loss increase due to chemical precipitates in 2010 strainer testing is more conservative than expected with the current design basis debris load. The staff noted that it is not opposed to the licensee's approach of applying margin to account for uncertainty given a minimal chemical effects test result, but more detail on the licensee's approach is needed. The staff stated that providing margin in terms of head loss rather than a bump-up factor would be easier to review.
The NRC staff noted that a graph of head loss over time including annotations of significant steps or events during the test would be useful. The staff also stated that the licensee should provide the limiting criteria (e.g., head loss, deaeration) and margin during the post-LOCA mission time so that the staff could better understand the limiting plant-specific conditions. The licensee stated that all of the previous test results from 2008 and 2010 would be used to establish head loss. The licensee stated there is a calculation that better ties the results of the tests to how the conventional head loss was determined. This calculation might better help the staff understand the licensee's methodology.
The licensee continued with a discussion of CCNPP-CHLE-002, Revision 0, "Chemical Effects Head Loss Experiment (CHLE) Test Protocol," for Calvert Cliffs (ADAMS Accession No. ML15119A129). The licensee discussed the final testing protocol for the design basis debris loads, test procedures, modifications to the test loop, and the pre-buffer borated water spray regime. A graph was presented that shows the sensitivity of the debris bed to chemical precipitate. The NRC staff agreed that these test results demonstrated sensitivity to detection of chemical precipitates. Schematics showing the layout of the testing facility were also presented.
Next, the licensee presented a status of the chemical effects testing at Alden Labs. The licensee initiated the first integrated test on April 17, 2015, and the detector bed head loss immediately started to increase. The head loss increased to 10.25 feet, and was rising, when the test was terminated. The licensee observed a darker fluid in the vertical test loop, and determined from further investigation that the water contained burnt binder from the baked Nukon, degraded marinate, and degraded inorganic zinc coated coupons. Samples have been sent to a different laboratory for further chemical analysis.
The NRC staff was also interested in the status of the ongoing chemical effects testing being performed by the licensee. The staff noted that when the licensee attempts to determine what caused the large head loss, it is important to correctly distinguish between conventional debris and chemical effects. The licensee and the staff agreed that it would be beneficial to have
additional discussions after the analysis has been completed on the head loss test. This will allow a more useful discussion on what may have caused the large head loss during the test run, and how the licensee plans to proceed with additional testing.
The licensee concluded their presentation with a brief discussion on the status of their risk-informed approach to GL 2004-02 resolution. The licensee indicated that they are scheduled to complete their risk-informed approach in 2nd quarter 2015, and that they will still pursue this even if their deterministic approach is successful.
Members of the public were in attendance. Public meeting feedback forms were not received although feedback from the public was received. Comments received included: a member of the public noting that he could not hear some of the speakers over the phone. He stated that he informed the phone operator and lodged a complaint with the Commission. In addition, the member of the public queried the staff on whether foreign material was accounted for in the strainer analyses for a post loss of coolant accident. The member of the public also suggested that foreign material could cause an accident similar to the accident at Three Mile Island.
Please direct any inquiries to me at 301-415-2549, or Alexander.Chereskin@nrc.gov.
Alexander N. Chereskin, Project Manager Plant Licensing Branch 1-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-317 and 50-318
Enclosures:
1 . List of Attendees cc w/encls: Distribution via Listserv
LIST OF ATTENDEES MAY 19, 2015, MEETING WITH EXELON GENERATION, LLC TO DISCUSS CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NOS. 1, AND 2 CHEMICAL EFFECTS TESTING FOR GL 2004-02 RESOLUTION U.S. Nuclear Regulatory Commission A. Chereskin M. Yoder S. Smith P. Klein M. Diaz-Colon L. Robinson A. Guzzetta G.Kulesa A. Obodoako*
J. Stang*
Exelon Generation, LLC K. Greene A. Elliot Sargent and Lundy (on behalf of Exelon Generation, LLC)
H. Kopke MPR Associates (on behalf of Exelon Generation, LLC)
E. Federline S. Kinsey Enercon Services (on behalf of Exelon Generation, LLC)
C. Sellers Members of the Public M. Lewis*
T. Sande B. Stair Enclosure
Meeting Notice: ML15124A804 Meetina Summary: ML151548557 Han d outs: ML15140A101 OFFICE NRR/DORL/LPLl-1 /PM NRR/DORL/LPLl-1/LA NRR/DSS/SSIB NAME AChereskin KGoldstein VCusumano DATE 06/09/2015 06/09/2015 06/10/2015 OFFICE NRR/DE/ESGB NRR/DORL/LPLl-1/BC(A) NRR/DORL/LPLl-1 /PM NAME GKulesa MDudek AChereskin DATE 06/11/2015 06/17/2015 06/17/2015