ML16194A230

Limerick, Units 1 and 2 - Response to Request for Additional Information Regarding Proposed Relief Request 14R-10

ML16194A230
Person / Time
Site:	Limerick
Issue date:	07/12/2016
From:	Jim Barstow Exelon Generation Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
14R-10
Download: ML16194A230 (6)

Text

200 Exelon Way Exelon Generation Kennett Square. PA 19348 www.exeloncorp.com 10 CFR 50.55a July 12, 2016 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 Limerick Generating Station, Units 1 and 2 Renewed Facility Operating License Nos. DPR-39 and DPR-85 NRC Docket Nos. 50-352 and 50-353

Subject:

Response to Request for Additional Information Regarding Proposed Relief Request 14R-10 for Limerick Generating Station, Units 1 and 2

References:

1) Letter from D. P. Helker (Exelon Generation Company, LLC) to the U.S. Nuclear Regulatory Commission, "Submittal of Relief Requests associated with the Fourth 10-Year Interval lnservice Inspection (ISi) Program," dated April 13, 2016(ML16104A122). 2) E-mail correspondence from R. Ennis (U.S. Nuclear Regulatory Commission) to S. J. Hanson (Exelon Generation Company, LLC), "Draft Request for Additional Information Regarding Proposed Relief Request 14R-10 for Limerick Generating Station, Units 1 and 2 (ML 16174A298)," dated June 22, 2016. By letter dated April 13, 2016, Exelon Generation Company, LLC (Exelon) submitted relief requests associated with the Fourth 10-Year lnservice Inspection Interval for Limerick Generating Station (LGS), Units 1 and 2. Specifically, Exelon submitted requests 14R-01, 14R-02, 14R-05, 14R-06, 14R-07, 14R-08, 14R-09, 14R-10, 14R-11, 14R-12, and 14R-13. In the Reference 2 e-mail correspondence, the U.S. Nuclear Regulatory Commission (NRC) requested additional information relating to Relief Request 14R-10. The attached contains Exelon's response to the NRC request for additional information.

Response to Request for Additional Information Proposed Relief Request 14R-1 O July 12, 2016 Page 2 There are no regulatory commitments in this response. If you have any questions concerning this response, please contact Stephanie J. Hanson at 610-765-5143. Respectfully, James Barstow Director, Licensing and Regulatory Affairs Exelon Generation Company, LLC

Attachment:

Response to Draft Request for Additional Information Regarding Proposed Relief Request 14R-1 O for Limerick Generating Station, Units 1 and 2 cc: USNRC Region I, Regional Administrator USNRC Senior Resident Inspector, LGS USNRC Project Manager, LGS R. R. Janati, Pennsylvania Bureau of Radiation Protection ATTACHMENT Limerick Generating Station, Units 1 and 2 Renewed Facility Operating License Nos. DPR-39 and DPR-85 Docket Nos. 50-352 and 50-353 Response to Draft Request for Additional Information Regarding Proposed Relief Request Concerning 14R-10 Response to Draft Request for Additional Information Attachment Proposed Relief Request I4R-10 Page 1 of 3 Docket Nos. 50-352 and 50-353 By letter dated April 13, 2016, Exelon Generation Company, LLC (Exelon) submitted relief requests associated with the Fourth 10-Year Inservice Inspection Interval for Limerick Generating Station (LGS), Units 1 and 2. Specifically, Exelon submitted requests I4R-01, I4R-02, I4R-05, I4R-06, I4R-07, I4R-08, I4R-09, I4R-10, I4R-11, I4R-12, and I4R-13. The NRC staff has determined that additional information is needed to complete its review. On June 22, 2016, the NRC issued a draft request for additional information (RAI). This RAI supersedes a previous draft RAI sent to Exelon on June 14, 2016 (ML16166A086), regarding Relief Requests I4R-02 and I4R-10. Specifically, question EVIB-RAI-1 involving I4R-02 has been deleted since Exelon has identified that the requested information was previously docketed in a number of inservice inspection summary reports.

The RAI is restated below along with Exelon's response. EVIB-RAI-2:

Relief request I4R-10 proposes an alternative to the requirements of the ASME Code,Section XI, Table IWB-2500-1, concerning nozzle-to-vessel weld and nozzle inner radii examination requirements.

a. Please provide information related to the inspections that have already been performed on the components for which this alternative is requested. In addition, include all indications that were found and how these indications were dispositioned. If no indications were found during any inspections, please state so.

b. Please provide information regarding the extent of inspection coverage that was obtained to date for nozzle-to-vessel welds and nozzle inner radii at LGS, Units 1 and 2. Response: The tables below provide information related to the inspections performed, inspection results, and extent of inspection coverage obtained during the third inspection interval for the nozzle-to-vessel welds and nozzle inside radius section exams covered by Relief Request I4R-10 at Limerick Generating Station, Units 1 and 2.

Response to Draft Request for Additional Information Attachment Proposed Relief Request I4R-10 Page 2 of 3 Docket Nos. 50-352 and 50-353 Summary#ComponentIDDescriptionLastInspectedCoverageObtainedIndicationsComments600700N2ANozzletoVessel1R12(2008)76%NRInoindicationsfound600710N2AIRNozzleInnerRadius1R12(2008)100%NRInoindicationsfound600730N2BNozzletoVesselno3rdintervalinspection600740N2BIRNozzleInnerRadiusno3rdintervalinspection600760N2CNozzletoVessel1R15(2014)essentially100%NRInoindicationsfound600770N2CIRNozzleInnerRadius1R15(2014)100%NRInoindicationsfound600790N2DNozzletoVesselno3rdintervalinspection600800N2DIRNozzleInnerRadiusno3rdintervalinspection600820N2ENozzletoVesselno3rdintervalinspection600830N2EIRNozzleInnerRadiusno3rdintervalinspection600850N2FNozzletoVessel1R12(2008)76%NRInoindicationsfound600860N2FIRNozzleInnerRadius1R12(2008)100%NRInoindicationsfound600800N2GNozzletoVesselno3rdintervalinspection600890N2GIRNozzleInnerRadiusno3rdintervalinspection600910N2HNozzletoVesselno3rdintervalinspection600920N2HIRNozzleInnerRadiusno3rdintervalinspection600940N2JNozzletoVesselno3rdintervalinspection600950N2JIRNozzleInnerRadiusno3rdintervalinspection600970N2KNozzletoVesselno3rdintervalinspection600990N2KIRNozzleInnerRadiusno3rdintervalinspection601000N3ANozzletoVesselno3rdintervalinspection601010N3AIRNozzleInnerRadiusno3rdintervalinspection601030N3BNozzletoVesselno3rdintervalinspection601040N3BIRNozzleInnerRadiusno3rdintervalinspection601060N3CNozzletoVesselno3rdintervalinspection601070N3CIRNozzleInnerRadiusno3rdintervalinspection601090N3DNozzletoVessel1R12(2008)75.1%NRInoindicationsfound601100N3DIRNozzleInnerRadius1R12(2008)100%NRInoindicationsfound601300N5ANozzletoVessel1R12(2008)77.6%NRInoindicationsfound601310N5AIRNozzleInnerRadius1R12(2008)100%NRInoindicationsfound601330N5BNozzletoVessel1R12(2008)77.6%NRInoindicationsfound601340N5BIRNozzleInnerRadius1R12(2008)100%NRInoindicationsfound601360N6ANozzletoVesselno3rdintervalinspection601370N6AIRNozzleInnerRadiusno3rdintervalinspection601380N6BNozzletoVesselno3rdintervalinspection601390N6BIRNozzleInnerRadiusno3rdintervalinspection601400N7NozzletoVessel1R16(2016)essentially100%NRInoindicationsfound601410N7IRNozzleInnerRadius1R16(2016)100%NRInoindicationsfound601420N8ANozzletoVesselno3rdintervalinspection601420N8AIRNozzleInnerRadiusno3rdintervalinspection601440N8BNozzletoVessel1R15(2014)essentially100%NRInoindicationsfound601450N8BIRNozzleInnerRadius1R15(2014)100%NRInoindicationsfound601490N17ANozzletoVesselno3rdintervalinspection601500N17AIRNozzleInnerRadiusno3rdintervalinspection601520N17BNozzletoVessel1R12(2008)77.6%NRInoindicationsfound601530N17BIRNozzleInnerRadius1R12(2008)100%NRInoindicationsfound601550N17CNozzletoVesselno3rdintervalinspection501560N17CIRNozzleInnerRadiusno3rdintervalinspection601580N17DNozzletoVesselno3rdintervalinspection601590N17DIRNozzleInnerRadiusno3rdintervalinspectionLimerickGeneratingStationUnit1*NRInorecordableindications Response to Draft Request for Additional Information Attachment Proposed Relief Request I4R-10 Page 3 of 3 Docket Nos. 50-352 and 50-353 Summary#ComponentIDDescriptionLastInspectedCoverageObtainedIndicationsCommentsN2ANozzletoVessel2R10(2009)83.7%NRInoindicationsfoundN2AIRNozzleInnerRadius2R10(2009)100%NRInoindicationsfoundN2BNozzletoVessel2R12(2013)essentially100%NRInoindicationsfoundN2BIRNozzleInnerRadius2R12(2013)100%NRInoindicationsfoundN2CNozzletoVesselno3rdintervalinspectionN2CIRNozzleInnerRadiusno3rdintervalinspectionN2DNozzletoVessel2R10(2009)79.9%NRInoindicationsfoundN2DIRNozzleInnerRadius2R10(2009)100%NRInoindicationsfoundN2ENozzletoVesselno3rdintervalinspectionN2EIRNozzleInnerRadiusno3rdintervalinspectionN2FNozzletoVessel2R12(2013)essentially100%NRInoindicationsfoundN2FIRNozzleInnerRadius2R12(2013)100%NRInoindicationsfoundN2GNozzletoVesselno3rdintervalinspectionN2GIRNozzleInnerRadiusno3rdintervalinspectionN2HNozzletoVessel2R09(2007)80%NRInoindicationsfoundN2HIRNozzleInnerRadius2R09(2007)100%NRInoindicationsfoundN2JNozzletoVessel2R09(2007)80%NRInoindicationsfoundN2JIRNozzleInnerRadius2R09(2007)100%NRInoindicationsfoundN2KNozzletoVessel2R10(2009)80.3%NRInoindicationsfoundN2KIRNozzleInnerRadius2R10(2009)100%NRInoindicationsfoundN3ANozzletoVesselno3rdintervalinspectionN3AIRNozzleInnerRadiusno3rdintervalinspectionN3BNozzletoVessel2R11(2011)essentially100%NRInoindicationsfoundN3BIRNozzleInnerRadius2R11(2011)100%NRInoindicationsfoundN3CNozzletoVessel2R09(2007)82%NRInoindicationsfoundN3CIRNozzleInnerRadius2R09(2007)100%NRInoindicationsfoundN3DNozzletoVessel2R09(2007)82%NRInoindicationsfoundN3DIRNozzleInnerRadius2R09(2007)100%NRInoindicationsfoundN5ANozzletoVesselno3rdintervalinspectionN5AIRNozzleInnerRadiusno3rdintervalinspectionN5BNozzletoVessel2R09(2007)85%NRInoindicationsfoundN5BIRNozzleInnerRadius2R09(2007)100%NRInoindicationsfoundN6ANozzletoVesselno3rdintervalinspectionN6AIRNozzleInnerRadiusno3rdintervalinspectionN6BNozzletoVesselno3rdintervalinspectionN6BIRNozzleInnerRadiusno3rdintervalinspectionN7NozzletoVessel2R13(2015)essentially100%NRInoindicationsfoundN7IRNozzleInnerRadius2R13(2015)100%NRInoindicationsfoundN8ANozzletoVessel2R10(2009)83.7%NRInoindicationsfoundN8AIRNozzleInnerRadius2R10(2009)100%NRInoindicationsfoundN8BNozzletoVessel2R10(2009)83.7%NRInoindicationsfoundN8BIRNozzleInnerRadius2R10(2009)100%NRInoindicationsfoundN17ANozzletoVesselno3rdintervalinspectionN17AIRNozzleInnerRadiusno3rdintervalinspectionN17BNozzletoVessel2R10(2009)81.8%NRInoindicationsfoundN17BIRNozzleInnerRadius2R10(2009)100%NRInoindicationsfoundN17CNozzletoVesselno3rdintervalinspectionN17CIRNozzleInnerRadiusno3rdintervalinspectionN17DNozzletoVessel2R09(2007)84%NRInoindicationsfoundN17DIRNozzleInnerRadius2R09(2007)100%NRInoindicationsfoundLimerickGeneratingStationUnit2*NRInorecordableindications