ASME Code Case N-504-4

	Issue date	Site	Title	Topic
ML24270A166	9 October 2024	Diablo Canyon	Authorization and Safety Evaluation for Alternative Request No. REP-RHR-SWOL	Non-Destructive Examination Weld Overlay Stress corrosion cracking Dissimilar Metal Weld
ML24254A255	25 September 2024	Seabrook	Alternative Request No. 4A-01 for the Fourth 10-Year Inservice Inspection Interval	Boric Acid Weld Overlay VT-2 Liquid penetrant
L-2024-084, Relief Request 4A-01, Rev 1 - Revision to Relief Request for Examination of Control Rod Drive Mechanism (Rod) Housing H-4 Canopy Seal Weld	30 May 2024	Seabrook	Relief Request 4A-01, Rev 1 - Revision to Relief Request for Examination of Control Rod Drive Mechanism (Rod) Housing H-4 Canopy Seal Weld	Boric Acid Weld Overlay VT-2 Stress corrosion cracking Code Reconciliation Liquid penetrant Affidavit
L-2024-019, Relief Request 4A-01- Request for an Alternative to the Requirements of the ASME Code for Examination of Control Rod Drive Mechanism (Rod) Housing H-4 Canopy Seal Weld	28 February 2024	Seabrook	Relief Request 4A-01- Request for an Alternative to the Requirements of the ASME Code for Examination of Control Rod Drive Mechanism (Rod) Housing H-4 Canopy Seal Weld	Boric Acid Weld Overlay VT-2 Stress corrosion cracking Liquid penetrant Affidavit
NMP1L3519, Submittal of Emergency Relief Request I5R-11 Concerning the Installation of a Weld Overlay on Reactor Pressure Vessel Recirculation Inlet Nozzle N2E Safe End-to-Nozzle Dissimilar Metal Weld (32-WD-208)	30 March 2023	Nine Mile Point	Submittal of Emergency Relief Request I5R-11 Concerning the Installation of a Weld Overlay on Reactor Pressure Vessel Recirculation Inlet Nozzle N2E Safe End-to-Nozzle Dissimilar Metal Weld (32-WD-208)	Non-Destructive Examination Weld Overlay Coatings Nondestructive Examination VT-2 Intergranular Stress Corrosion Cracking Stress corrosion cracking Eddy Current Testing Liquid penetrant Through-Wall Leakage Dissimilar Metal Weld DM weld
NMP1L3516, Submittal of Emergency Relief Request I5R-11 Concerning the Installation of a Weld Overlay on Reactor Pressure Vessel Recirculation Inlet Nozzle N2E Safe End-to-Nozzle Dissimilar Metal Weld (32-WD-208)	29 March 2023	Nine Mile Point	Submittal of Emergency Relief Request I5R-11 Concerning the Installation of a Weld Overlay on Reactor Pressure Vessel Recirculation Inlet Nozzle N2E Safe End-to-Nozzle Dissimilar Metal Weld (32-WD-208)	Non-Destructive Examination Weld Overlay Coatings Nondestructive Examination VT-2 Intergranular Stress Corrosion Cracking Stress corrosion cracking Eddy Current Testing Liquid penetrant Through-Wall Leakage Dissimilar Metal Weld DM weld
NMP1L3513, Submittal of Emergency Relief Request I5R-11 Concerning the Installation of a Weld Overlay on Reactor Pressure Vessel Recirculation Inlet Nozzle N2E Safe End-to-Nozzle Dissimilar Metal Weld (32-WD-208)	24 March 2023	Nine Mile Point	Submittal of Emergency Relief Request I5R-11 Concerning the Installation of a Weld Overlay on Reactor Pressure Vessel Recirculation Inlet Nozzle N2E Safe End-to-Nozzle Dissimilar Metal Weld (32-WD-208)	Weld Overlay Coatings Nondestructive Examination VT-2 Intergranular Stress Corrosion Cracking Stress corrosion cracking Liquid penetrant Through-Wall Leakage Dissimilar Metal Weld DM weld
ML23080A297	21 March 2023	Nine Mile Point	Presentation Slides for Information Call on 3/21/23 N2E Recirc Discharge Nozzle Weld Repair Request for Alternative	Weld Overlay Intergranular Stress Corrosion Cracking
L-2022-015, Relief Request Number 20 - Request for an Alternative to the Requirements of the ASME Code for Examination of Reactor Vessel Closure Head Control Element Drive Mechanism (CEDM) Housing 27 Canopy Seal Weld - RAI	14 January 2022	Saint Lucie	Relief Request Number 20 - Request for an Alternative to the Requirements of the ASME Code for Examination of Reactor Vessel Closure Head Control Element Drive Mechanism (CEDM) Housing 27 Canopy Seal Weld - RAI	Boric Acid Weld Overlay VT-2 Stress corrosion cracking Liquid penetrant Unidentified leakage Unidentified leak Affidavit
L-2022-011, Relief Request Number 20 - Request for an Alternative to the Requirements of the ASME Code for Examination of Reactor Vessel Closure Head Control Element Drive Mechanism (CEDM) Housing 27 Canopy Seal Weld	12 January 2022	Saint Lucie	Relief Request Number 20 - Request for an Alternative to the Requirements of the ASME Code for Examination of Reactor Vessel Closure Head Control Element Drive Mechanism (CEDM) Housing 27 Canopy Seal Weld	Boric Acid Weld Overlay VT-2 Stress corrosion cracking Liquid penetrant Unidentified leakage Unidentified leak Affidavit
ML21061A089	2 March 2021	Sequoyah	TVA Presentation Slides for March 2, 2021, Public Meeting to Discuss Sequoyah Alternative Request	Weld Overlay Liquid penetrant
ML21055A550	24 February 2021	Sequoyah	Teleconference with the Tennessee Valley Authority to Discuss a Planned Request Regarding the Use of American Society of Mechanical Engineers Code Case N-504-4 at Sequoyah Nuclear Plant, Units 1 and 2
ML19232A025	27 August 2019	Waterford	Authorization of Proposed Alternative to ASME Code Section XI, IWA-4000, Repair/Replacement Activities	Weld Overlay Nondestructive Examination Stress corrosion cracking Liquid penetrant Dissimilar Metal Weld
ML19042A298	6 February 2019	Waterford	NRR E-mail Capture - Verbal Authorization for Relief Request WF3-RR-19-1, Proposed Alternative for ASME Code Section XI, IWA-400 for Waterford Steam Electric Station, Unit 3 (EPID L-219-LLR-0003)	Non-Destructive Examination Weld Overlay Dissimilar Metal Weld
W3F1-2019-0011, Response to U.S. Nuclear Regulatory Commission Request for Additional Information Regarding Relief Request WF3-RR-19-1 for Application of Dissimilar Metal Weld Full Structural Weld Overlay	4 February 2019	Waterford	Response to U.S. Nuclear Regulatory Commission Request for Additional Information Regarding Relief Request WF3-RR-19-1 for Application of Dissimilar Metal Weld Full Structural Weld Overlay	Weld Overlay Nondestructive Examination Intergranular Stress Corrosion Cracking Stress corrosion cracking Liquid penetrant Dissimilar Metal Weld Thermal fatigue
W3F1-2019-0009, Proposed Inservice Inspection Program Alternative WF3-RR-19-1 for Application of Dissimilar Metal Weld Full Structural Weld Overlay - Reactor Coolant System Cold Leg Drain Nozzles	28 January 2019	Waterford	Proposed Inservice Inspection Program Alternative WF3-RR-19-1 for Application of Dissimilar Metal Weld Full Structural Weld Overlay - Reactor Coolant System Cold Leg Drain Nozzles	Weld Overlay Nondestructive Examination Intergranular Stress Corrosion Cracking Stress corrosion cracking Liquid penetrant Dissimilar Metal Weld Thermal fatigue
ML18347B419	17 January 2019	Braidwood	Relief Request I4R-03, Relief from ASME Requirements for the Fourth 10-Year Inservice Inspection Interval Related to Degraded Canopy Seal Welds Associated with Control Rod Drive Mechanism	Boric Acid Weld Overlay Nondestructive Examination VT-2 Liquid penetrant
ML18197A430	9 August 2018	Brunswick	Relief Request ISI-10 to Regarding Alternate Repair of Feedwater Nozzle Dissimilar Metal Welds	Weld Overlay Nondestructive Examination Incorporated by reference Liquid penetrant Dissimilar Metal Weld DM weld
RS-18-095, Response to Request for Additional Information Regarding Braidwood Station Fourth Lnservice Inspection Interval Relief Request 14R-03	31 July 2018	Braidwood	Response to Request for Additional Information Regarding Braidwood Station Fourth Lnservice Inspection Interval Relief Request 14R-03	Weld Overlay Nondestructive Examination
ML18192C171	11 July 2018	Braidwood	NRR E-mail Capture - Preliminary Request for Additional Information Regarding Braidwood Station, Units 1 and 2, Relief Request IR4-03	Weld Overlay
ML18124A308	15 May 2018	Brunswick	Verbal Authorization of Relief Request for Inservice Inspection Program Alternative ISI-10 Alternate Repair of Feedwater Nozzle Welds	Weld Overlay Dissimilar Metal Weld
BSEP 18-0039, Proposed In-Service Inspection Alternative for Application of Dissimilar Metal Weld Full Structural Overlay - Nozzles N4A and N4D	19 March 2018	Brunswick	Proposed In-Service Inspection Alternative for Application of Dissimilar Metal Weld Full Structural Overlay - Nozzles N4A and N4D	Weld Overlay Hydrostatic Nondestructive Examination Intergranular Stress Corrosion Cracking Stress corrosion cracking Liquid penetrant Dissimilar Metal Weld
RS-17-159, Supplemental Information for Dresden Nuclear Power Station Fifth Inservice Inspection Interval Relief Request 15R-16	15 November 2017	Dresden	Supplemental Information for Dresden Nuclear Power Station Fifth Inservice Inspection Interval Relief Request 15R-16	Weld Overlay
RS-17-158, Fifth Inservice Inspection Interval Relief Request 15R-16	7 November 2017	Dresden	Fifth Inservice Inspection Interval Relief Request 15R-16	Weld Overlay Stress corrosion cracking Liquid penetrant Dissimilar Metal Weld
ML17230A274	10 October 2017	Brunswick	Relief from the Requirements of the ASME Code, Section XI, IWA-4000 (Inservice Inspection Program Alternative ISI-07)	Weld Overlay Hydrostatic Intergranular Stress Corrosion Cracking Stress corrosion cracking Liquid penetrant Pressure Boundary Leakage Dissimilar Metal Weld
DCL-17-083, Request for Approval of Alternative for Application of Full Structural Weld Overlay, REP-RHR-SWOL	26 September 2017	Diablo Canyon	Request for Approval of Alternative for Application of Full Structural Weld Overlay, REP-RHR-SWOL	Non-Destructive Examination Weld Overlay Nondestructive Examination Intergranular Stress Corrosion Cracking Stress corrosion cracking Dissimilar Metal Weld Thermal fatigue
NL-17-1157, Transmittal of 1R20 ISI Report Summary	30 June 2017	Vogtle	Transmittal of 1R20 ISI Report Summary	Weld Overlay Hydrostatic Nondestructive Examination Flow Accelerated Corrosion Integrated leak rate test Liquid penetrant Thermal fatigue
JAFP-17-0054, James a FitzPatrick - Submittal of Stress Analysis Summary for the 24-10-130 Weld Overlay	25 May 2017	FitzPatrick	James a FitzPatrick - Submittal of Stress Analysis Summary for the 24-10-130 Weld Overlay	Weld Overlay Nondestructive Examination Intergranular Stress Corrosion Cracking Stress corrosion cracking Dissimilar Metal Weld
ML17096A333	9 May 2017	Brunswick	Verbal Authorization of Relief Request for Reactor Vessel Closure Head Penetration Nozzle N9 Repair	Non-Destructive Examination Weld Overlay Dissimilar Metal Weld
ML17090A168	12 April 2017	FitzPatrick	Alternative to ASME Code Requirements for Weld Overlay Repair	Weld Overlay Hydrostatic Nondestructive Examination Finite Element Analysis Stress corrosion cracking Liquid penetrant Dissimilar Metal Weld
BSEP 17-0033, Proposed In-service Inspection Alternative for Application of Dissimilar Metal Weld Full Structural Overlay	6 April 2017	Brunswick	Proposed In-service Inspection Alternative for Application of Dissimilar Metal Weld Full Structural Overlay	Weld Overlay Hydrostatic Nondestructive Examination Intergranular Stress Corrosion Cracking Stress corrosion cracking Liquid penetrant Pressure Boundary Leakage Dissimilar Metal Weld
JAFP-17-0023, Submittal of the Final Ultrasonic Test Results on the 24-10-130 Weld Overlay	9 March 2017	FitzPatrick	Submittal of the Final Ultrasonic Test Results on the 24-10-130 Weld Overlay	Weld Overlay Liquid penetrant Through Wall Leak Dissimilar Metal Weld
ML17031A280	8 February 2017	FitzPatrick	Summary of Teleconference with Entergy Nuclear Operations, Inc. Regarding Verbal Authorization for Relief Request RR-21 for the James A. Fitzpatrick Nuclear Power Plant	Non-Destructive Examination Weld Overlay Dissimilar Metal Weld
JAFP-17-0010, Proposed Alternative to ASME Code Requirements for Weld Overlay Repair, RR-21	27 January 2017	FitzPatrick	Proposed Alternative to ASME Code Requirements for Weld Overlay Repair, RR-21	Non-Destructive Examination Weld Overlay Hydrostatic Nondestructive Examination Finite Element Analysis Intergranular Stress Corrosion Cracking Liquid penetrant Dissimilar Metal Weld DM weld
IR 05000317/2016001	27 April 2016	Calvert Cliffs	Integrated Inspection Report 05000317/2016001 and 05000318/2016001, 01/01/2016 - 03/31/2016	Boric Acid High Radiation Area Fire Barrier Water Inventory Control Weld Overlay Post Accident Monitoring Internal Flooding Nondestructive Examination Functionality Assessment Eddy Current Testing Dissimilar Metal Weld Coast down Operability Assessment Overspeed trip
ML15302A338	26 October 2015	Millstone	Transmittal of Commitment Information Related to Approved Alternative Request RR-04-20, Use of Weld Overlays as an Alternative Repair and Mitigation Technique	Weld Overlay Liquid penetrant Dissimilar Metal Weld
ML15294A382	18 October 2015	Millstone	Connecticut, Inc., Millstone Power Station, Unit 2 - Revision to Alternative Request RR-04-20, Use of Weld Overlays as an Alternative Repair and Mitigation Technique - Alternative to Pre-Weld Overlay Liquid Penetrant Examination	Boric Acid Non-Destructive Examination Weld Overlay Stress corrosion cracking Liquid penetrant Dissimilar Metal Weld
NL-15-0539, Feedwater Pipe to Inconel Extension Piece Full Structural Weld Overlay Nondestructive Examination Results - Spring 2015 Outage (2R23)	16 March 2015	Hatch	Feedwater Pipe to Inconel Extension Piece Full Structural Weld Overlay Nondestructive Examination Results - Spring 2015 Outage (2R23)	Weld Overlay Nondestructive Examination Liquid penetrant Dissimilar Metal Weld
ML15057A190	16 March 2015	Millstone	Audit of the Licensee'S Management of Regulatory Commitments, Regulatory Commitments Changes, and Appropriateness of Application of the Regulatory Commitments	Ultimate heat sink Weld Overlay Internal Flooding
ML14197A287	26 June 2014	Mcguire McGuire	MISI-1462.10-0040, Revision 0, Fourth Inspection Interval Inservice Inspection Plan, Enclosure 1	Boric Acid Weld Overlay Nondestructive Examination VT-2 Aging Management License Renewal EVT-1 Liquid penetrant Dissimilar Metal Weld Thermal fatigue
ML14084A549	28 April 2014	Braidwood	Relief from the Requirements of the ASME Code	Boric Acid Weld Overlay Hydrostatic Nondestructive Examination VT-2 Incorporated by reference Stress corrosion cracking Liquid penetrant Dissimilar Metal Weld
ML14112A071	11 April 2014	Millstone	Alternative Request RR-04-20, Use of Weld Overlays as an Alternative Repair and Mitigation Technique	Weld Overlay Nondestructive Examination Stress corrosion cracking Liquid penetrant Dissimilar Metal Weld
RS-14-037, Response to Request for Additional Information Regarding Relief Request I3R-11 Associated with the Repair/Replacement of Control Rod Drive Mechanism (CRDM) Canopy Seal Welds	24 January 2014	Braidwood	Response to Request for Additional Information Regarding Relief Request I3R-11 Associated with the Repair/Replacement of Control Rod Drive Mechanism (CRDM) Canopy Seal Welds	Boric Acid Weld Overlay Nondestructive Examination VT-2 Intergranular Stress Corrosion Cracking Stress corrosion cracking Liquid penetrant Pressure Boundary Leakage Through-Wall Leakage Dissimilar Metal Weld
LR-N13-0256, Inservice Inspection (Lsi) Program Plan, Fourth Ten-Year Interval	11 November 2013	Salem	Inservice Inspection (Lsi) Program Plan, Fourth Ten-Year Interval	Boric Acid Weld Overlay Hydrostatic Nondestructive Examination VT-2 Incorporated by reference High Energy Line Break Aging Management Flow Accelerated Corrosion Stress corrosion cracking License Renewal EVT-1 Through-Wall Leak Through-Wall Leakage Dissimilar Metal Weld Operability Assessment Thermal fatigue Water hammer
RS-13-234, Relief Request I3R-ll Associated with Alternative Requirements for Repair/Replacement of Control Rod Drive Mechanism (CRDM) Canopy Seal Welds	19 September 2013	Braidwood	Relief Request I3R-ll Associated with Alternative Requirements for Repair/Replacement of Control Rod Drive Mechanism (CRDM) Canopy Seal Welds	Weld Overlay Hydrostatic Nondestructive Examination VT-2 Stress corrosion cracking Liquid penetrant Pressure Boundary Leakage
ML13134A467	10 June 2013	Three Mile Island	Proposed Alternative RR-12-02 Regarding Weld Overlay of the Lower Cold Leg Letdown Nozzle Dissimilar Metal Welds and Alloy 600 Safe-End	Weld Overlay Incorporated by reference Stress corrosion cracking Liquid penetrant Dissimilar Metal Weld DM weld
GNRO-2012/00109, Stress Analysis Summary Demonstrating That the Nozzle to Safe-End DMW, N06B-KB, Will Perform Its Intended Design Function After Weld Overlay Installation	6 September 2012	Grand Gulf	Stress Analysis Summary Demonstrating That the Nozzle to Safe-End DMW, N06B-KB, Will Perform Its Intended Design Function After Weld Overlay Installation	Non-Destructive Examination Weld Overlay Hydrostatic Nondestructive Examination Intergranular Stress Corrosion Cracking Stress corrosion cracking Dissimilar Metal Weld
ML12214A318	17 August 2012	Grand Gulf	Relief Request ISI-17, Use of ASME Code Cases N-638-4 and N-504-4 for Alternative Repair of RHR LPCI Weld During Refueling Outage RF-18, Third 10-Year Inservice Inspection Interval	Weld Overlay Hydrostatic Incorporated by reference Intergranular Stress Corrosion Cracking Stress corrosion cracking Liquid penetrant Dissimilar Metal Weld
ML12174A147	10 July 2012	Pilgrim	Safety Evaluation for Relief Request PRR-21, Rev 4, to Install a Weld Overlay on RPV-n14-1 Standby Liquid Control Safe-End Nozzle Weld at Pilgrim	Non-Destructive Examination Weld Overlay Hydrostatic Incorporated by reference Finite Element Analysis Stress corrosion cracking Liquid penetrant Dissimilar Metal Weld
GNRO-2012/00051, Day Report of Nozzle N06B-KB Weld Overlay Examination Results Following Completion of Repair	24 May 2012	Grand Gulf	Day Report of Nozzle N06B-KB Weld Overlay Examination Results Following Completion of Repair	Weld Overlay Liquid penetrant
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ASME Code Case N-504-4

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