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| | issue date = 02/13/2012 | | | issue date = 02/13/2012 |
| | title = Response to Request for Additional Information on 10 CFR 50.46 Report of Changes or Errors in ECCS Evaluation Models | | | title = Response to Request for Additional Information on 10 CFR 50.46 Report of Changes or Errors in ECCS Evaluation Models |
| | author name = Allen B S | | | author name = Allen B |
| | author affiliation = FirstEnergy Nuclear Operating Co | | | author affiliation = FirstEnergy Nuclear Operating Co |
| | addressee name = | | | addressee name = |
Letter Sequence Response to RAI |
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Category:Letter type:L
MONTHYEARL-23-260, Corrections to the 2022 Combined Annual Radiological Environmental Operating Report and Radioactive Effluent Release Report for the Davis-Besse Nuclear Power Station2023-12-0707 December 2023 Corrections to the 2022 Combined Annual Radiological Environmental Operating Report and Radioactive Effluent Release Report for the Davis-Besse Nuclear Power Station L-23-243, Independent Spent Fuel Storage Installation - Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation2023-12-0606 December 2023 Independent Spent Fuel Storage Installation - Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation L-23-215, Changes to Emergency Plan2023-10-19019 October 2023 Changes to Emergency Plan L-23-205, Supplement to Application for Order Consenting to Transfer of Licenses and Conforming License Amendments2023-09-12012 September 2023 Supplement to Application for Order Consenting to Transfer of Licenses and Conforming License Amendments L-23-172, Quality Assurance Program Manual2023-08-31031 August 2023 Quality Assurance Program Manual L-23-188, Energy Harbor Nuclear Corp., Supplement to Application for Order Consenting to Transfer of Licenses and Conforming License Amendments2023-08-0707 August 2023 Energy Harbor Nuclear Corp., Supplement to Application for Order Consenting to Transfer of Licenses and Conforming License Amendments L-23-175, Submittal of Fifth Ten Year Inservice Testing Program2023-08-0101 August 2023 Submittal of Fifth Ten Year Inservice Testing Program L-23-034, 2022 Annual 10 CFR 50.46 Report of Changes to or Errors in Emergency Core Cooling System Evaluation Models2023-06-13013 June 2023 2022 Annual 10 CFR 50.46 Report of Changes to or Errors in Emergency Core Cooling System Evaluation Models L-23-135, Response to Regulatory Issue Summary 2023-01, Preparation and Scheduling of Operator Licensing Examinations2023-05-31031 May 2023 Response to Regulatory Issue Summary 2023-01, Preparation and Scheduling of Operator Licensing Examinations L-23-065, Annual Financial Report2023-05-22022 May 2023 Annual Financial Report L-23-131, Readiness for Resumption of NRC Supplemental Inspection2023-05-12012 May 2023 Readiness for Resumption of NRC Supplemental Inspection L-23-101, Combined Annual Radiological Environmental Operating Report and Radioactive Effluent Release Report for the Davis-Besse Nuclear Power Station - 20222023-05-12012 May 2023 Combined Annual Radiological Environmental Operating Report and Radioactive Effluent Release Report for the Davis-Besse Nuclear Power Station - 2022 L-23-092, Occupational Radiation Exposure Report for Year 20222023-04-27027 April 2023 Occupational Radiation Exposure Report for Year 2022 L-23-061, Submittal of the Decommissioning Funding Status Reports2023-03-31031 March 2023 Submittal of the Decommissioning Funding Status Reports L-23-037, and Perry Nuclear Power Plant - Independent Spent Fuel Storage Installation Changes, Tests, and Experiments2023-03-29029 March 2023 and Perry Nuclear Power Plant - Independent Spent Fuel Storage Installation Changes, Tests, and Experiments L-23-066, Annual Notification of Property Insurance Coverage2023-03-21021 March 2023 Annual Notification of Property Insurance Coverage L-23-059, Response to Apparent Violation in NRC Inspection Report 05000346/2022091; EA 23-0022023-03-0909 March 2023 Response to Apparent Violation in NRC Inspection Report 05000346/2022091; EA 23-002 L-22-212, CFR 50.55a Request RP-5 Regarding Inservice Pump Testing2023-03-0606 March 2023 CFR 50.55a Request RP-5 Regarding Inservice Pump Testing L-23-048, Response to Request for Additional Information Regarding Technical Specification 5.6.6 Steam Generator Tube Inspection 180-Day Report2023-03-0101 March 2023 Response to Request for Additional Information Regarding Technical Specification 5.6.6 Steam Generator Tube Inspection 180-Day Report L-23-057, Energy Harbor Nuclear Corp Retrospective Premium Guarantee2023-02-20020 February 2023 Energy Harbor Nuclear Corp Retrospective Premium Guarantee L-22-253, Submittal of Pressure and Temperature Limits Report, Revision 52023-01-10010 January 2023 Submittal of Pressure and Temperature Limits Report, Revision 5 L-22-284, Request for Notice of Enforcement Discretion for Technical Specification 3.7.9, Ultimate Heat Sink (UHS)2022-12-28028 December 2022 Request for Notice of Enforcement Discretion for Technical Specification 3.7.9, Ultimate Heat Sink (UHS) L-22-211, Technical Specification 5.6.6 Steam Generator Tube Inspection 180-Day Report2022-09-29029 September 2022 Technical Specification 5.6.6 Steam Generator Tube Inspection 180-Day Report L-22-216, Submittal of Pressure and Temperature Limits Report. Revision 42022-09-27027 September 2022 Submittal of Pressure and Temperature Limits Report. Revision 4 L-22-213, Occupational Radiation Exposure Report for Year 2021 - Correction2022-09-23023 September 2022 Occupational Radiation Exposure Report for Year 2021 - Correction L-22-129, Submittal of the Updated Final Safety Analysis Report, Revision 342022-09-20020 September 2022 Submittal of the Updated Final Safety Analysis Report, Revision 34 L-22-194, Submittal of Supplemental Information for the Reanalysis for Protection Against Low Temperature Reactor Coolant System Overpressure Events2022-09-19019 September 2022 Submittal of Supplemental Information for the Reanalysis for Protection Against Low Temperature Reactor Coolant System Overpressure Events L-22-203, Submittal of Evacuation Time Estimates2022-09-12012 September 2022 Submittal of Evacuation Time Estimates L-22-050, Summary of Changes to the Energy Harbor Nuclear Corp. Quality Assurance Program Manual2022-08-0909 August 2022 Summary of Changes to the Energy Harbor Nuclear Corp. Quality Assurance Program Manual L-22-152, Response to Request for Additional Information Regarding a License Amendment Request That Revises the Davis-Besse Nuclear Power Station Emergency Plan2022-07-0505 July 2022 Response to Request for Additional Information Regarding a License Amendment Request That Revises the Davis-Besse Nuclear Power Station Emergency Plan L-22-068, Cycle 22 and Refueling Outage 22 Inservice Inspection Summary Report2022-06-30030 June 2022 Cycle 22 and Refueling Outage 22 Inservice Inspection Summary Report L-22-037, 2021 Annual 10 CFR 50.46 Report of Changes to or Errors in Emergency Core Cooling System Evaluation Models2022-06-30030 June 2022 2021 Annual 10 CFR 50.46 Report of Changes to or Errors in Emergency Core Cooling System Evaluation Models L-22-149, Post Accident Monitoring Report2022-06-23023 June 2022 Post Accident Monitoring Report L-22-153, Readiness for NRC Supplemental Inspection Required for a White Finding2022-06-22022 June 2022 Readiness for NRC Supplemental Inspection Required for a White Finding L-22-098, Withdrawal of Proposed Inservice Inspection Alternative RR-A22022-06-22022 June 2022 Withdrawal of Proposed Inservice Inspection Alternative RR-A2 L-22-136, Steam Generator Tube Circumferential Crack Report - Spring 2022 Refueling Outage2022-06-0707 June 2022 Steam Generator Tube Circumferential Crack Report - Spring 2022 Refueling Outage L-22-102, Report of Facility Changes, Tests, and Experiments2022-05-16016 May 2022 Report of Facility Changes, Tests, and Experiments L-22-092, Combined Annual Radiological Environmental Operating Report and Radiological Effluent Release Report for the Davis-Besse Nuclear Power Station - 20212022-05-16016 May 2022 Combined Annual Radiological Environmental Operating Report and Radiological Effluent Release Report for the Davis-Besse Nuclear Power Station - 2021 L-22-124, Response to Request for Additional Information Regarding License Amendment Request to Revise the Design Basis for the Shield Building2022-05-12012 May 2022 Response to Request for Additional Information Regarding License Amendment Request to Revise the Design Basis for the Shield Building L-22-047, Unit No.1 - Core Operating Limits Report, Cycle 23, Revision O and Revision 12022-05-10010 May 2022 Unit No.1 - Core Operating Limits Report, Cycle 23, Revision O and Revision 1 L-22-127, Readiness for NRC Supplemental Inspection Required for a Greater than Green Finding2022-05-0606 May 2022 Readiness for NRC Supplemental Inspection Required for a Greater than Green Finding L-22-089, Occupational Radiation Exposure Report for Year 20212022-04-12012 April 2022 Occupational Radiation Exposure Report for Year 2021 L-22-056, Energy Harbor Nuclear Corp., Annual Notification of Property Insurance Coverage2022-03-22022 March 2022 Energy Harbor Nuclear Corp., Annual Notification of Property Insurance Coverage L-22-059, Response to Request for Additional Information on Proposed Inservice Test Alternative RP-32022-03-21021 March 2022 Response to Request for Additional Information on Proposed Inservice Test Alternative RP-3 L-22-074, Response to Regulatory Issue Summary 2022-01, Preparation and Scheduling of Operator Licensing Examinations2022-03-15015 March 2022 Response to Regulatory Issue Summary 2022-01, Preparation and Scheduling of Operator Licensing Examinations L-22-061, Ile Post Exam Letter L-22-0612022-02-24024 February 2022 Ile Post Exam Letter L-22-061 L-22-023, Retrospective Premium Guarantee2022-02-17017 February 2022 Retrospective Premium Guarantee L-21-266, Response to Request for Additional Information on Proposed Inservice Inspection Alternative RR-A22022-01-27027 January 2022 Response to Request for Additional Information on Proposed Inservice Inspection Alternative RR-A2 L-20-289, Emergency Plan Amendment Request2022-01-19019 January 2022 Emergency Plan Amendment Request L-21-290, Response to NRC Inspection Report 05000346/2021091, EA-21-1762021-12-21021 December 2021 Response to NRC Inspection Report 05000346/2021091, EA-21-176 2023-09-12
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FENOC fl rctEnergy Nuclea Operatlng Conpany 5501 Notth Slata Rwte 2 OakHartuc Ohlo43449 8uty8,Nen Vice President - Nuclear February 13,2412 L-12-055 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001
SUBJECT:
Davis-Besse Nuclear Power Station ECesEvaluationW
,*,Xi!"#',-it{f, 10 cFR 50.a6(aX3Xii)Docket No.
50-346, License No. NPF-3 Response to Reouesifor Additional Information on 10 CFR 50.46 Report of Chanoes 9rBy letter dated May 27,2011 (Agencywide_Documents Access and Management system (nOnUS) Accession No. ML1 tl-5fi6q4, FirstEnergy Nuclear Operating Company iff5fOCisubmitted the annual report for changes and errors in an emergency core cooling system {ECCS) evaluation tnoO"f iiMl, ot in the application of such a model' for the Davis-Besse Nuclear power Station. ine report covered the period from January 1,2A10 to December 31, 2010.On January 18, 2012,the Nuclear Regulatory Commission (NRC) requested additional information
,.gurdin;'this report. FEl.iOC't i"tponse to the request, as discussed withNRC staff on December 19, 2011, is attached.
There are no regulatory commitments contained in this letter. lf there are any questions or if additional informrtion is required, please contact Mr. Phil H. Lashley, Supervisor
-Fleet Licensing, at (330) 315-6808.
Sincerely, ,t*,- 5,4e'--1Barry S. Allen
Attachment:
Response to Request for Additional Information on the 10 CFR 50'46 nep{ of Cianges or Errors in the emuigency Core CoJting System Evaluation Model for the Davis-Besse Nuclear Power Statloncc: NRC Region lll Administrator NRC Resident InsPector Nuclear Reactor Regulation Project Manager Utility Radiological Safety Board Attachment L-12-055 Response to Request for Additional Information on the 10 CFR 50.46 Report ofChanges or Errors in the Emergency Core Cooling System Evaluatlon Modelfor the Davis-Besse Nuclear Power Station Page 1 ot2By fetter dated May 27,2011 (Agencyruide Documents Access and Management System (ADAMS) Accession lrto. wtt-i 11510642), FirstEnergy Nuclear Operating Cbmpany (FENOC) submitted the annual report for changes a1d errors in an emergency core cooling system (ECCS) evaluation model (Elr4),-o1.in the application of such a model, for the Dlvis-Besse Nuclear Power Station (DBNPS), On January 18,2i.A12, the Nuclear Regulatory Commission (NRC) requested additional information regarding this report. lne ruRC staff's request is presented in bold type'followed by FENOC's response.ln Table 1, "10 CFR 50.46 Summary for 2010," lt is noted that peak cladding temperatures for Mk.B.HTP fuel Inihe mixed-core and full'core large'break loss'of-coolant accident (LBLOCA) evaluation models are "estlmated" per Evaluation Model Revision 0.9.
Please ciarify why these specific peak cladding temperatures are ,,estimated" and not "analyzed" slmilar to the other values in the table'FENOC began inserting the new Mk-B-HTP fuel assemblV de191into the DBNPSreactor in Cycle 15, which began in April 2006. The original L-BLO.CAenalyses for peak cladding temperature (PCT) f6r the transition cores and the Mk-B-HTP full-core were pefformed prior to cycle ts. nt that time, analyzed LBLOCA PCT values of 2095'3"F lMk-a-Hrp mixed-core) and 2117.2'F (Mr<-g-FifP full-core) were reported to FENOCby the fuel vendor,By letter dated May 25,,2007 (ADAMS Accesslon No, ML071500391), FENOCsubmitted the 2006 annual report of changes to the 10 CFR 50'46 ECCS EM' whichinctuded tho anaryzed LBLocA pcr vatu6 of 209s"F (rou{gd-down from 2095.3"F) forthe Mk-B-HTp mixed-core.
Since a full core of the Mk-B-HTP fuelwould not beachleved until cycle 17 in 2010, a full-core LBLOCA PCT value was not included in the 2006 through 2009 reports.By letter dated May 28, 2008 (ADAMS Accession No. ML081540470), FENOC submitted the 2oai annual report of changes to the 10 cFR 50.46 Eccs EM, including the effect of an EM application error for tG Mk'B-HTP mixed'core results' The error, as explained in the ZilOl report, was an inconect interpretation of gqmTa energyfractions reported from the bnlCeruZ computer code. This was evaluated by the FENOC fuel vendor and was found to cause an increase in the Mk-B-HTP mixed-core pCT value of +Z.TiF,leading to the final 2007 reported value of 2098'F (rnixed'core)
.shown in Table 1 of that letter. However, the value was reported as "analyzed" when, in fact, it was "estimated" by the FENOC fuel vendor, as required by10 CFR 50.46(aX3Xi). ln ttre 2009 report, submitted by letter C.atgd May 27 ' 2010 (ADAMS nccebdibn'No.
ML101530497), the values were reported correctly as"estimated,"
Attachment L-12-055Page 2 of 2In 2010, when the full core of Mk-B-HTP assemblies was achieved, a PCT value for the Mk-B-HPT full-core LBLOCA was included in the annual report, submitted by the May 27,2011 letter. The gamma energy fraction error noted in the 20OT report also affected the Mk-B-HTP full-core LBLOCA PCT value. The magnitude of the errorwas estimated as +1.8oF for the Mk-B-HTP full-core that yielded an estimated PCT of2119"F when added to the 2117 .2'F full-core analyzed value, Subsequently, in theMay 27,2011 letter, FENOC reported the 2119oF estimated value being utilized at thattime rather than the original analyzed value of 2117.2"F.