Letter Sequence Other |
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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
[Table View] |
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Category:Letter
MONTHYEARIR 05000317/20230042024-02-0101 February 2024
Integrated Inspection Report 05000317/2023004 and 05000318/2023004
ML24029A0102024-01-29029 January 2024
Request for Information and Notification of Conduct of IP 71111.21.N.04, Age-Related Degradation, Reference Inspection Report 05000317/2024010 and 05000318/2024010
ML24003A8872024-01-19019 January 2024
Exemption from Select Requirements of 10 CFR Part 73 (EPID L-2023-LLE-0033 (Security Notifications, Reports, and Recordkeeping and Suspicious Activity Reporting))
05000318/LER-2023-004, Submittal of LER 2023-004-00 for Calvert Cliffs Nuclear Power Plant, Unit 2, Submittal of Automatic Reactor Trip from Reactor Protection System Actuation Due to Loss of Unit Service Transformer2024-01-16016 January 2024
Submittal of LER 2023-004-00 for Calvert Cliffs Nuclear Power Plant, Unit 2, Submittal of Automatic Reactor Trip from Reactor Protection System Actuation Due to Loss of Unit Service Transformer
ML24011A0732024-01-11011 January 2024
Proposed Alternative to the Requirements for Repair/Replacement of Saltwater (SW) System Buried Piping
05000318/LER-2023-002, Forward LER 2023-002-00 for Calvert Cliffs Nuclear Power Plant, Unit 2, Automatic Reactor Trip from Reactor Protection System Actuation Due to Loss of Unit Service Transformer2024-01-0808 January 2024
Forward LER 2023-002-00 for Calvert Cliffs Nuclear Power Plant, Unit 2, Automatic Reactor Trip from Reactor Protection System Actuation Due to Loss of Unit Service Transformer
05000318/LER-2023-003, Forward LER 2023-003-00 for Calvert Cliffs Nuclear Power Plant, Unit 2, Manual Actuation of Auxiliary Feedwater System Due to 22 Steam Generator Feedwater Pump Trip2024-01-0808 January 2024
Forward LER 2023-003-00 for Calvert Cliffs Nuclear Power Plant, Unit 2, Manual Actuation of Auxiliary Feedwater System Due to 22 Steam Generator Feedwater Pump Trip
ML24005A0222024-01-0505 January 2024
Revised Steam Generator Tube Inspection Reports
ML23304A0642024-01-0202 January 2024
Issuance of Amendment No. 349 to Modify the Long-Term Coupon Surveillance Program
RS-23-125, Request for Exemption from 10 CFR 2.109(b)2023-12-0707 December 2023
Request for Exemption from 10 CFR 2.109(b)
ML23331A2992023-11-27027 November 2023
Submittal of Condition Prohibited by Technical Specifications Due to Failure to Sample Diesel Generator Fuel Oil Storage Tank
IR 05000317/20230102023-11-20020 November 2023
Biennial Problem Identification and Resolution Inspection Report 05000317/2023010 and 05000318/2023010
ML23318A4722023-11-14014 November 2023
Supplement to License Amendment Request to Adopt TSTF-59-A
ML23317A1032023-11-10010 November 2023
Supplemental Information Letter for Part 73 Exemption Request - Responses to Request for Confirmatory Information
ML23317A1192023-11-10010 November 2023
Constellation Energy Generation, LLC - 2023 Annual Report - Guarantees of Payment of Deferred Premiums
ML23310A0442023-11-0707 November 2023
Project Manager Assignment
IR 05000317/20230402023-11-0202 November 2023
95001 Supplemental Inspection Report 05000317/2023040 and Follow-Up Assessment Letter
IR 05000317/20230032023-11-0101 November 2023
Integrated Inspection Report 05000317/2023003 and 05000318/2023003
IR 05000317/20230902023-10-26026 October 2023
Final Significance Determination of a White Finding with Assessment Follow-Up and Notice of Violation; Inspection Report 05000317/2023090
ML23289A1202023-10-16016 October 2023
Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation
RS-23-097, Constellation Energy Generation, LLC, Advisement of Leadership Changes and Submittal of Updated Standard Practice Procedures Plans2023-10-12012 October 2023
Constellation Energy Generation, LLC, Advisement of Leadership Changes and Submittal of Updated Standard Practice Procedures Plans
RS-23-108, Proposed Alternative for Examinations of Examination Categories B-B, B-D, and C-A Steam Generator Pressure Retaining Welds and Full Penetration Welded Nozzles2023-10-11011 October 2023
Proposed Alternative for Examinations of Examination Categories B-B, B-D, and C-A Steam Generator Pressure Retaining Welds and Full Penetration Welded Nozzles
RS-23-105, Proposed Alternative for Examinations of Examination Category C-B Steam Generator Nozzle-to-Shell Welds and Nozzle Inside Radius Sections2023-10-10010 October 2023
Proposed Alternative for Examinations of Examination Category C-B Steam Generator Nozzle-to-Shell Welds and Nozzle Inside Radius Sections
ML23279A1202023-10-0606 October 2023
Response to NRC Inspection Report and Preliminary White Finding
IR 05000317/20230502023-09-29029 September 2023
Special Inspection Report 05000317/2023050 and Preliminary White Finding and Apparent Violation
ML23272A1032023-09-29029 September 2023
Condition Prohibited by Technical Specifications Due to Inoperable Nuclear Instrumentation at Very Low Power
IR 05000317/20234012023-09-18018 September 2023
Cyber Security Inspection Report 05000317/2023401 and 05000318/2023401
ML23254A0012023-09-0505 September 2023
Registration of Use of Casks to Store Spent Fuel
IR 05000317/20230052023-08-31031 August 2023
Updated Inspection Plan for Calvert Cliffs Nuclear Power Plant, Units 1 and 2 (Report 05000317/2023005 and 05000318/2023005)
ML23158A1952023-08-30030 August 2023
R. E. Ginna - Issuance of Amendments to Adopt TSTF-273-A, Revision 2, Safety Function Determination Program Clarifications
ML23241A8412023-08-29029 August 2023
Response to Request for Additional Information - Proposed Alternative to the Requirements for Repair/Replacement of Saltwater (SW) System Buried Piping
ML23240A3872023-08-28028 August 2023
Senior Reactor and Reactor Operator Initial License Examinations
ML23151A3472023-08-21021 August 2023
Issuance of Amendments to Adopt TSTF-295-A, Modify Note 2 to Actions of PAM Table to Allow Separate Condition Entry for Each Penetration
ML23219A1662023-08-16016 August 2023
Request for Additional Information Regarding Proposed Alternative to the Requirements for Repair/Replacement of Saltwater (SW) System Buried Piping (EPID: L-2023-LLR-0006) - Non-proprietary
ML23228A1002023-08-15015 August 2023
Notification of Readiness for NRC 95001 Inspection
ML23188A0402023-08-0808 August 2023
Issuance of Amendment Nos. 346 and 324 Adoption of TSTF-577, Revised Frequencies for Steam Generator Tube Inspections, Revision 1
ML23214A1572023-08-0707 August 2023
Correction to the Renewed Facility Operating License Page 3 in Amendment No 345
IR 05000317/20230022023-08-0303 August 2023
Integrated Inspection Report 05000317/2023002
ML23188A0512023-07-13013 July 2023
Correction to the Renewed Facility Operating License Pages in Amendment Nos. 336 and 314
ML23186A0372023-07-13013 July 2023
Correction to the Renewed Facility Operating License Pages in Amendment Nos. 340 and 318
IR 05000317/20233012023-07-12012 July 2023
Initial Operator Licensing Examination Report 05000317/2023301 and 05000318/2023301
IR 05000317/20230122023-07-10010 July 2023
Commercial Grade Dedication Report 05000317/2023012 and 05000318/2023012
ML23180A2362023-06-29029 June 2023
Correction of Errors on Technical Specification Pages
RS-23-083, Withdrawal - Proposed Alternatives Related to the Steam Generators2023-06-27027 June 2023
Withdrawal - Proposed Alternatives Related to the Steam Generators
ML23156A6752023-06-20020 June 2023
Request for Withholding Information from Public Disclosure for Proposed Alternative to the Requirements for Repair/Replacement of Saltwater System Buried Piping
2024-02-01
[Table view] |
Text
James A.Spina V ice President nstellati nuclear eneration GroupApril22,2008 U.S.Nuclear Regulatory Commi ssion Washington,DC20555 Calvert CliffsNuclear PowerP lan t, In c.1650Calvert CliffsParkway Lusby , Maryland2065 7 41 0.495.5200 41 0.495-3500 Fax ATTENTION:
SUBJECT:
REFERENCES
- Document Control Desk Calvert Cliffs NuclearPowerPlantUnitNos.I&2;Docket Nos.5 0-317&5 0-318 Revision to Generi cLetter2004
-02 Response(a)LetterfromMr.
1.E.Pollockto Document Control Desk (NRC), dated November29,2005, Supplemental ResponsetoNRC GenericLetter2004
-02,"Pot ential Impact of Debris Blockage on Emergency Re circulation during Design Basis Accidents at Pressurized Water Reactors" (b)LetterfromMr.P
.D.M ilanotoMr.J.A.Spina (CCNPP), dated December18,2006, Approval of Extension Request for Compl etion of Corrective A ctionsinRespon se to Generic Lette r 2004-02(TAC N o.MC4672)(c)NEI04-07, dated May 28,2004,Pressuri zed Water Rea ctor (PWR)Sump Performan ce M ethodology The purpose of Reference(a)wastosupp lement our responsetoG eneric Letter 20 04-02 to address issuesraisedbythe Nuclear Regulatory Commi ssion (NRC)atapubli c meetingonSe ptember30,2005.As part of the effortstoresolve Generic Safety Issue-191,theNRChas conductedtestsat Argonne NationalLabsto determine the magnitude of the impact of ch emical precipitation which might occur inthe containmentsumppool during po st-loss-of-coolant accident (LOCA)recirculation.
One ofthetests examined the interaction of calcium-silicate insulationwitha Trisodium Phosp hate (TSP)sumppool bufferagent.The results showedthata chemical precipitantdidformandthe impact on strainer headloss was signifi cant.Thoseplantsc ontaining both calcium-silicate insulationandTS P buffering agent were identifiedbythe NRC/Nuclear Energy In stitute (NEI)as needingtoaddre sstheimpa ct ofthisresultonplantope rability includi ngthene ed to implement additional c ompensatory measures.CalvertCliffsUnitsIand 2wereamon gtheplantsid entifi ed as having calcium-sili cate in sulation and TSP buffering agent.I n Referen ce(a)westatedthat,"...Calv ert Cliffs ha s no calcium-si licat e insulationinthezon e of influence of the LOCAbr eak;th er efore, per NEI04-07...no calcium-silicate in sulation DocumentControlDeskApril22,2008Page2willbe destroyedduringtheLOCA,andthusnonewill transporttothe containmentsumppool.Sincethereisnocalcium-silicateinsulationinour containmentsumppooltheresults of the Argonne National Labs chemicaleffectstestinghasnoimpactonplant operability
." This informationwasbasedona walkdown ofUnit1du ringthe2004 refueling outage.That walkdowndidnotidentifyanysilicateinsulationinthezone of influence ofaReactor CoolantSystem(RCS)pipebreak.However,insulationinspections performedduringtheUnit12008 refuelingoutageshowedsomeUnit1pipingdidhavecalcium-silicateinsulationinthezone ofinfluenceforanRCSpipebreak.These additionalinspectionswereperformedbasedon information obtainedduringtheUnit2 inspections performedinthe2007refuelingoutage.
Therefore, in accordancewith10CFR50
.9(a)weareprovidingthisupdated information
.Reference(a)wasusedto supporttheapproval of our extensionrequestforthe completion of correctiveactionsinresponsetoGenericLetter2004-02forUnit1 (Reference b).The information originallysuppliedisnotcorrectforUnit1,basedonthe2008 walkdown oftheUnit1 Containment.Allactionsthatwerethesubject of the extensionrequesthavebeen completedandall of theidentifiedcalciumsilicateinsu lationwasmitigatedasdescribedbelow.
Therefore,webelievethattheupdated informationprovidedbelowhasnoimpactonthe previously granted extension.Updated informationforUnit1 In accordancewithSection3.4.2
.2 ofNEI04-07 (Referencec),weidentifiedthezone of influence(17LID)fortheinsulationin Containmenthavingtheminimum destruction pressure (unjacketed insulation)andapplied thistoallinsulationtypes
.AsstatedinNEI04-07,"th is approach prov ides a conservativelylargevaluefordebris generation." WalkdownsinUnit1duringthe2008 refueling outageinspectedareasagainwithinthislargezone ofinfluenceforinsulationand specifically calcium-s ilicateinsulation.The walkdowns identified calcium-silicateinsulationonthe pressurizer reliefvalvelinesin the pressurizer compartment,ontwosteam generator blowdownlinesnearthelowerlevel of Containment,andonfour component cooling water reliefvalvelinesncarthelowerlevel of Containment.
The calcium-silicateinsulationwas jacketedandtheinsulation jacketwasheldonwithrivets.Otherlineswereidentifiedwhichhad calcium-silicateinsulationbuttheyareinareasthatwouldnotbe impacted byanRCSpipebreak
.Ithasalsobeen determinedfromNEI04-07thatinsulationwithbanded jacketinghasazone of influence ofonly5.45LID
.We contactedthesource of this informationandweretoldthatthe publisheddatawasforbandsspaced8 Y4" apart.In addition, WCAP-16720-P documentsthatwiththebandsspaced3"apartazone of influence of3LIDwas obtained.Duringthe2008Unit1 refuelingoutage,bandsspacedat6"wereplacedonthecalc ium-silicate insulation greaterthan10pipe diametersfromanRCSpipebreak,andbandsspacedat2
%"wereplacedoncalcium-silicateinsulationbetweenadistance of4and10pipediameters.Inaddition,allidentifiedcalcium-silicateinsulationlessthan4LIDfromtheRCSpipingwasreplacedwitheitherfiberglassorTempMatinsulation.
Therefore,thecalcium-silicateinsulationwithinthezone of influence ofRCSpipinghaseitherbeen eliminatedorarmoredsuchthatthereisnolongeranyidentifiedcalcium-silicateinsulationthatcouldget damagedandwashedto the containment sumpduringaLOCA
.The bandingandremoval of calcium-silicateinsulationwhich occurredduringthe2008 refuelingoutageresultsinan operable containment sump.Anoperabilityevaluation was performedtoassessthepast operability of the containmentsumpwith calcium-silicateinsulationwithriveted jacketing(preUnit1 refuelingoutage).The evaluation determinedthatthelocationandinherent strength oftheinsulationwithriveted jacketingwouldlimitthe Document Control Desk April22,2008Page3 amount of insulation impactedbyanRCSbreak.
Therefore, the evaluation concluded that past operability of Unit Iwasnot significantly affectedbythe discovered calcium-silicate insulation.
We understand that calcium-silicate insulationandits interaction with trisodium phosphate,aswellas other chemical effects,arethe subject of continued studybythe NRCandthe industry.We continue to evaluate the information provided by these efforts to determinethebest course of action to ensure the continued operability of our containment sumps.Shouldyouhave questio ns regarding this matter, please contactMr.JayS.Gaines at (410)495-5219.STATEOF MARYLANDTOWIT:COUNTYOF CALVERT I, James A.Spina, being duly sworn, state thatIamVice President-Calvert Cliffs Nuclear Power Plant, Inc.(CCNPP),andthat Iamduly authorized to executeandfilethis response on behalf of CCNPP.Tothebest of my knowledgeandbelief,the statements containedinthis documentaretrueand correct.To the extent that these statementsarenotbasedonmy personal knowledge, they are based upon information provided by other CCNPP employees and/or consultants
.Such informationhasbeen reviewed in accordance with company practice and I believeittobe reliab le.Subscribed and sworn beforeNotaryPulie il\andfortheState of Maryland and County oftl!a.t'e(, thisday of'/;I ,2008.I'iilTNESS IllyHandand Notarial Seal: My Commission Expires: JAS/PSF/bjdcc:D.V.Pickett, NRC S.J.Collins, NRC Resident Inspector, NRC S.Gray,DNR
