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, Request, Request, Request
- Acceptance...
- Supplement, Supplement
Administration
- Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting
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MONTHYEARML0506900352005-03-0303 March 2005
Response to NRC Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactors
Project stage: Request
ML0515100172005-05-31031 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
ML0520200572005-07-15015 July 2005
Response to NRC Request for Additional Information Re NRC Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactors
Project stage: Response to 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
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
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
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
ML0827404972008-09-30030 September 2008
Attachment 2, ECCS and CS System Figures
Project stage: Other
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-
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
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: Draft Response to RAI
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
Project stage: Response to RAI
ML12356A0852012-12-27027 December 2012
January 8, 2013 - Notice of Teleconference with Calvert Cliffs Nuclear Power Plant, LLC
Project stage: Meeting
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
ML13038A6042013-01-24024 January 2013
PIRT Item Summary
Project stage: Request
ML13038A4872013-01-24024 January 2013
CCNPP-CHLE-001, Revision 0c, Chemical Effects Head Loss Experiment (Chle) Test Plan for Calvert Cliffs Nuclear Power Plant
Project stage: Request
ML13038A5782013-01-24024 January 2013
Chemical Effects Pirt Considerations for Calvert Cliffs Nuclear Power Plant (CCNPP-CHLE-003, Revision 0b)
Project stage: Request
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
ML13030A3482013-02-0707 February 2013
Summary of Teleconference with Calvert Cliffs Nuclear Power Plant, Units 1 and 2 to Discuss Proposed Risk-Informed Approach to the Resolution of Generic LTR 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Des
Project stage: Meeting
ML13045A1822013-02-19019 February 2013
March 20, 2013, Notice of Forthcoming Teleconference with Calvert Cliffs and Nrc/Nrr Staff to Have Additional Discussions of Licenseess Proposed Path for Resolution of Generic Letter 2004-02
Project stage: Meeting
ML13050A5112013-02-19019 February 2013
MC4672-3 Corrected Notice -Public Meeting on March 20, 2013 Re-GL2004-02
Project stage: Request
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 Licensees 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
2010-06-07
[Table View] |
Text
LICENSEE:
Exelon Generation Company, LLC FACILITY:
Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2
SUBJECT:
SUMMARY
OF MAY 21,2014, MEETING WITH EXELON GENERATION COMPANY, LLC, 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 DESIGN BASIS ACCIDENTS AT PRESSURIZED-WATER REACTORS" WITH A FOCUS ON ONGOING CHEMICAL EFFECTS TESTING AND EARLY RESULTS (TAC NOS. MC4672 AND MC4673)
On May 21, 2014, a Category 1 public meeting was held between the U.S. Nuclear Regulatory Commission (NRC) and representatives of Exelon Generation Company, LLC, the licensee, at NRC Headquarters, Two White Flint North, 11545 Rockville Pike, Rockville, Maryland. The purpose of the meeting was to discuss 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" with a focus on ongoing chemical effects testing and early results for Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2. The meeting notice and agenda, dated May 8, 2014, is available in the Agencywide Documents Access and Management System (ADAMS) at Accession No. ML14128A233. A list of attendees is provided in the Enclosure, but may not be all inclusive.
The licensee discussed:
(1) Autoclave test results;
- CCNPP-CHLE [chemical effects head loss experiment]-005 High Temperature Tests (ADAMS Accession No. ML13149A399)
- CCNPP-CHLE-006 Metals Tests (ADAMS Accession No. ML13149A405)
- CCNPP-CHLE-01 0 Concrete & Insulation Tests (ADAMS Accession No. ML14206A993)
- CCNPP-CHLE-011 Long Term Integrated Simulation Tests (ADAMS Accession No. ML14206B001)
(2) Integrated CHLE test plans; (3) Small scale penetration test plans; and (4) Future periodic meetings. (See ADAMS Accession No. ML14142A323).
Plant Modifications
- 1.
The licensee indicated that it is continuing to work on modifications to regulate sump fluid temperature at the site and plans to complete installation of temperature instrumentation during the 2015-2016 outages. The licensee is performing this modification to provide the operators with additional options to ensure adequate emergency core cooling system flow in the event of a loss-of-coolant accident (LOCA).
- 2.
The licensee stated that during the 2014 refueling outage, some fibrous insulation located near potential large-break LOCA (LBLOCA) locations was replaced. The replacement activities focused primarily on removing mineral wool.
- 3.
The licensee removed some calcium silicate located near potential LBLOCA locations.
The remaining calcium silicate insulation in this location was double-jacketed and double-banded to prevent it from being a source of debris. The calcium silicate insulation that was removed was replaced with reflective metal insulation.
Downstream Effects-lnvessel
- 4.
The licensee stated that strainer "bypass" tests performed in 2007 resulted in approximately 8 grams of fiber per fuel bundle passing through the strainer. This test did not meet NRC guidance and more testing is planned.
Strong Acid Generation
- 5.
The licensee stated that strong acid generation was determined using published information on radiolysis and release of ionizing radiation for post-accident conditions.
This information will be used in upcoming testing and evaluation of the postulated post-LOCA environment.
CHLE Test Program
- 6.
The licensee stated that it is developing a baseline test for the double-ended guillotine break LBLOCA. This test will only include boron and no other chemical elements. The licensee indicated that it is still developing the design basis of the chemical effects tests.
Autoclave Testing Preliminary Results-CHLE-005
- 7.
The purpose of the high temperature test is to determine if operating a large scale test at less the 200 degrees Fahrenheit would result in representative dissolved species concentrations compared to the highest projected post LOCA temperatures. The licensee stated that the high temperature test was conducted at two temperature regimes. The results of the testing conducted at 195 degrees Fahrenheit for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> were compared to tests conducted at 280 degrees Fahrenheit for 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />.
The licensee indicated that the concentrations of calcium, zinc, and copper in tests conducted at 195 degrees Fahrenheit were equivalent to tests conducted at 280 degrees Fahrenheit. The licensee stated that the concentrations of aluminum at 195 and at 280 degrees Fahrenheit do not converge. However, the licensee stated that the concentration levels are lower than the levels observed in WCAP-16530. The licensee is proposing to add metal salts to make up the difference in chemical elements. The NRC found the approach of adding salts to achieve expected dissolved specie concentrations acceptable, but did not provide feedback on the merits of the individual chemicals proposed by the licensee.
Autoclave Testing Preliminary Results
- 8.
At the time of the meeting, the licensee stated that it had performed 60 autoclave tests.
- 9.
The licensee stated that it will use coated coupons to model inorganic zinc. The licensee also indicated that it will include galvanized steel in the testing.
- 10.
The licensee stated that it will obtain concrete from the same batch of concrete found in containment.
Integrated CHLE
- 11.
The licensee stated that it is working on shake-down testing at the Alden lab facility. At the time of the meeting, the licensee stated that the alkyds autoclave testing is still in progress.
- 12.
The licensee stated that the integrated test will include galvanized steel and inorganic zinc coated steel coupons. The velocity in the test will be comparable to the approach velocity of the debris bed for the strainer. The sodium tetraborate used in the experiment will be in the form of small granules. The licensee stated that the ratio of the spray phase to the injection phase is approximately 8:1. The licensee stated that the best estimate for pH for the integrated test is 7.3. Similarly, the pH for the autoclave test was determined to be 7.3. The licensee indicated that it will not make efforts to maintain the pH of the integrated test; rather it will add the representative amount of buffer and allow the system pH to evolve during the test. Previous tests have shown that the buffered system maintains a stable pH during testing.
- 13.
The licensee stated that it will send test plans for CHLE-01 0 and -011 and papers on Marinate and zinc to the NRC staff.
- 14.
The licensee stated that it will confirm the debris bed sensitivity by adding WCAP-16530-NP-A precipitate to the test tank. This will also provide information relative to the lag time between precipitation in the test tank and head loss response in the vertical loop containing a debris bed.
Members of the public were in attendance. A Public Meeting Feedback form was received. The NRC staff reviewed the form and entered the information into the Public Meeting Feedback System.
Please direct any inquiries to me at 301-415-1016, or Nadiyah.Morgan@nrc.gov.
Docket Nos. 50-317 and 50-318
Enclosure:
List of Attendees cc w/encl: Distribution via Listserv Nadiyah S. Morgan, Project Manager Plant Licensing Branch 1-1 Division of Operating Reactor licensing Office of Nuclear Reactor Regulation
LIST OF ATTENDEES MAY 21, 2014, MEETING WITH EXELON GENERATION GL 2004-02 RISK-INFORMED RESOLUTION CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NOS. 1 AND 2
!NAME
, Nadiyah Morgan Paul Klein
, Matt Yoder I Stephen Smith
' Aloysius Obodoako
- Steve Kinsey I Eric Federline I ORGANIZATION
, Exelon MPR Associates, Inc.
1 MPR Associates, Inc.
i Exelon Exelon Enclosure
ML142068144 T. Wertz, NRR T. Bowers, EDO Region I RidsNrrDeEsgb M. Diaz-Colon, NRR RidsNrrDssSsib OFFICE DORL/LPLI-1/PM DORL/LPLI-1/LA DE/ESGB/BC DSS/SSIB/BC DORL/LPLI-1/BC NAME NMorgan KGoldstein GKulesa VCusumano BBeasley DATE 8/12/2014 08/07/2014 10/15/2014 10/16/2014 11/06/2014
