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Category:Meeting Agenda
MONTHYEARPMNS20230826, Meeting to Discuss the Nuclear Regulatory Commissions (NRC) 2022 Annual Assessment of Safety Performance at South Texas Project Nuclear Power Plant, Units 1 and 22023-07-11011 July 2023 Meeting to Discuss the Nuclear Regulatory Commissions (NRC) 2022 Annual Assessment of Safety Performance at South Texas Project Nuclear Power Plant, Units 1 and 2 ML22229A4872022-08-17017 August 2022 Presubmittal Teleconference with STP Nuclear Operating Company Regarding Proposed License Amendment Request to Revise the Dose Consequence Analysis for MSLB and LRA Events for South Texas Project, Units 1 and 2 PMNS20220467, Public Webinar to Discuss the Nuclear Regulatory Commission'S 2021 Annual Assessment of Safety Performance at Region IV Plants2022-05-0303 May 2022 Public Webinar to Discuss the Nuclear Regulatory Commission'S 2021 Annual Assessment of Safety Performance at Region IV Plants PMNS20220262, Meeting with South Texas Project Nuclear Operating Company (STPNOC) Regarding Its Exemption Request Related to an Inspection Requirement for One Multipurpose Canister at the STP Units 1 and 2 Independent Spent Fuel Storage Installation2022-03-21021 March 2022 Meeting with South Texas Project Nuclear Operating Company (STPNOC) Regarding Its Exemption Request Related to an Inspection Requirement for One Multipurpose Canister at the STP Units 1 and 2 Independent Spent Fuel Storage Installation (Isf PMNS20220173, Meeting with South Texas Project Nuclear Operating Company Regarding Expected Submittal of Exemption/Relief Request Related to a non-compliance with ASME Code Testing Requirements2022-02-25025 February 2022 Meeting with South Texas Project Nuclear Operating Company Regarding Expected Submittal of Exemption/Relief Request Related to a non-compliance with ASME Code Testing Requirements ML21196A4132021-07-15015 July 2021 Teleconference and Webinar with STP Nuclear Operating Company Regarding the License Amendment Request to Revise the Moderator Temperature Coefficient Surveillance Requirement for South Texas Project, Units 1 and 2 PMNS20210563, Public Webinar to Discuss the NRCs 2020 Annual Assessment of Safety Performance at Arkansas Nuclear One, Columbia, Comanche Peak, Cooper, Diablo Canyon, Palo Verde, River Bend Station, South Texas Project, Waterford, and Wolf Creek2021-04-29029 April 2021 Public Webinar to Discuss the NRCs 2020 Annual Assessment of Safety Performance at Arkansas Nuclear One, Columbia, Comanche Peak, Cooper, Diablo Canyon, Palo Verde, River Bend Station, South Texas Project, Waterford, and Wolf Creek ML20170B1872020-06-19019 June 2020 Public Webinar to Discuss the Nrc'S Assessment of Safety Performance at Region IV Plants for 2019 ML16113A1992016-04-22022 April 2016 Public Meeting - Discussion Between South Texas Project, Units 1 and 2, and NRC Staff Regarding the Revised Aluminum Bronze Selective Leaching Aging Management Program for All Potentially Susceptible Welds Throughout the Facility ML15182A1802015-06-25025 June 2015 Talking Points for 7/2/15 Public Call ML14008A2252014-01-0808 January 2014 Notice of Category I Public Meeting Concurrence by NRO, to Discuss Resolution of Open Items and Outstanding Requests for Additional Information (RAI) Responses to Support the Safety Review of the South Texas Project (STP) Units 3... ML13357A2662013-12-24024 December 2013 1/8/14 - Notice of Meeting with STP Nuclear Operating Co. to Discuss Revised Pilot Submittal and Request for Exemptions for a Risk-Informed Approach to Resolve Generic Safety Issue (GSI)-191 at South Texas Project, Units 1 and 2 ML13330B2222013-12-0505 December 2013 Notice of Meeting with STP Nuclear Operating Company to Discuss Revised Pilot Submittal and Request for Exemptions for a Risk-Informed Approach to Resolve Generic Safety Issue (GSI)-191 at South Texas Project, Units 1 and 2 (TAC MF2400-MF24 ML13119A0802013-04-30030 April 2013 Notice Meeting Via Conference Call with STP Nuclear Operating Company to Discuss Risk-Informed Approach to Resolve Generic Safety Issue 191 for South Texas, Units 1 and 2 ML13101A3142013-04-12012 April 2013 Notice of Meeting Via Conference Call with STP Nuclear Operating Company to Discuss Risk-Informed Approach to Resolve Generic Safety Issue 191 for South Texas, Units 1 and 2 ML13023A3342013-02-25025 February 2013 1/15/2013 Summary of Public Meetings Conducted to Discuss Draft Supplemental Environmental Impact Statement Related to Review of South Texas Project, Units 1 & 2, License Renewal Application ML13046A0652013-02-22022 February 2013 3/5/13 Notice of Preapplication Meeting Via Conference Call with STP Nuclear Operating Company to Discuss License Amendment Request for Fire Protection Program to Credit Additional Operator Actions for South Texas, Units 1 and 2 ML12340A1352012-11-27027 November 2012 Meeting Notice by Conference Call with STP Nuclear Operating Company; Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution South Texas Project, Units 1 and 2 ML12297A3312012-11-27027 November 2012 Summary of Prelicensing Meeting with STP Nuclear Operating Company to Discuss Proposed Amendment for Approval of Revised Fire Protection Program Related to Alternate Shutdown Capability for South Texas, Units 1 and 2 ML12331A2922012-11-27027 November 2012 Notice of Meeting by Conference Call with STP Nuclear Operating Company; Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Units 1 and ML12321A1222012-11-20020 November 2012 12/3/12 Notice of Meeting by Conference Call with STP Nuclear Operating Company; Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Unit ML12270A4692012-10-23023 October 2012 August 27, 2012, Summary of Meeting Held on Between NRC and STPNOC Representatives to Discuss the STP, LRA ML12243A4042012-09-25025 September 2012 Notice of Prelicensing Meeting with STP Nuclear Operating Company to Discuss Proposed Amendment for Approval of Revised Fire Protection Program Related to Alternate Shutdown Capability for South Texas, Units 1 and 2 ML12261A3012012-09-21021 September 2012 Notice of Forthcoming Public Meeting Via Conference Call with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach ML12227A5902012-08-23023 August 2012 9/6/2012 Notice of Meeting by Conference Call with STP Nuclear Operating Company; Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Uni ML12226A4552012-08-15015 August 2012 Forthcoming Meeting with STP Nuclear Operating Company Regarding License Renewal for the South Texas Project, Units 1 and 2 ML12146A0202012-05-31031 May 2012 Notice of 6/11/12 Meeting by Conference Call with STP Nuclear Operating Company; Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Unit ML1207400312012-03-15015 March 2012 3/29/12 Notice of Meeting Viaconference Call with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for Units 1 and 2 ML1203400432012-02-0303 February 2012 Notice of Forthcoming Meeting Via Conference Call with STP Nuclear Operating Company ML1203003642012-02-0202 February 2012 3/8/12 Forthcoming Meeting by Conference Call with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, U ML1200901012012-01-10010 January 2012 Notice of Forthcoming Public Meeting Via Conference Call with South Texas Project Nuclear Operating Company ML1129701092011-11-0101 November 2011 Notice of Meeting Via Conference Call with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor Sump Performance, Resolution Approach for South Texas, Units 1 & 2 ML1132104112011-11-0101 November 2011 Revised Notice of by Conference Call with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, ML1127900992011-10-11011 October 2011 Notice of Meeting by Conference Call with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Units 1 an ML1127901512011-10-11011 October 2011 Notice of Meeting by Conference Call with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Units 1 & ML1125101482011-09-15015 September 2011 Notice of Meeting by Conference Call with STP Nuclear Operating Co. to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Units 1 and 2 ML1121301822011-08-0202 August 2011 Meeting Notice with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Units 1 and 2 (TAC ME5358-ME5359 ML1118615292011-07-12012 July 2011 Notice of Conference Call with STP Nuclear Operating Company to Discuss Risk-informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Units 1 and 2 ML1116402112011-06-24024 June 2011 Notice of Conference Call with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Units 1 & 2 ML1114706522011-05-16016 May 2011 Correction 06/02/2011 Notice of Meeting with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Units 1 ML1113302442011-05-16016 May 2011 Notice of Meeting with STP Nuclear Operating Company to Discuss Risk-Informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor (PWR) Sump Performance, Resolution Approach for South Texas, Units 1 and 2 ML1106701312011-03-0707 March 2011 Ltr to D. Rencurrel Re Participation in Commission Meeting on the Cumulative Effects of Reactor Regulation on 5/12/11 ML1104105052011-02-10010 February 2011 2/22/11 Notice of Forthcoming Public Meeting with STP Nuclear Operating Co., Units 1 & 2, to Discuss Risk-informed GSI-191, Assessment of Debris Accumulation on Pressurized-Water Reactor Sump Performance, Resolution Option Approach ML1035106972011-01-25025 January 2011 3/02/11 Forthcoming Meeting to Discuss the License Renewal Process and Environmental Scoping for South Texas Project, Units 1 and 2 License Renewal Application Review ML1023004452010-08-27027 August 2010 Notice of Conference Call with STP Nuclear Operating Corp., to Discuss Request for Additional Information for Generic Letter 2004-02 ML1021803392010-08-0505 August 2010 Ltr to E. Halpin Re Participation in Commission Meeting on the Resolution of Generic Safety Issue (GSI) - 191, Assessment of Debris Accumulation on Pressurized Water Reactor (PWR) Performance on 09/29/10 ML0925703902009-09-17017 September 2009 Notice of Meeting with STP Nuclear Operating Company to Discuss Experience with Implementation of Risk Managed Technical Specification Pilot Amendment (Initiative 4b) and Other Initiatives ML0807100082008-03-11011 March 2008 Notice of Meeting with Arizona Public Service, Entergy Operations, Inc., Exelon Generation Co., FPL Energy, Luminant Generation Co., South Carolina Electric & Gas Co., STP Electric Generating Co., & Southern Nuclear Operating Co ML0729204682007-10-29029 October 2007 09/25/2007, Summary of Meeting Between the U.S. Nuclear Regulatory Commission Staff and Strategic Teaming and Resource Sharing Representatives to Discuss License Renewal Activities ML0724904812007-09-11011 September 2007 Notice of Meeting with Strategic Teaming and Resource Sharing (Stars) for Licensees of Comanche Peak, Diablo Canyon, Palo Verde, South Texas, and Wolf Creek Plants 2023-07-11
[Table view] Category:Slides and Viewgraphs
MONTHYEARML22243A1312022-08-31031 August 2022 STP Nuclear Operating Company August 31, 2022 Presentation - Pre-Submittal Meeting for Updated Main Steam Line Break and Locked Rotor Dose Consequence Analysis to Address Extended Cooldown Timelines ML22214A0972022-08-0202 August 2022 Presentation by South Texas Project ML22153A2942022-06-17017 June 2022 richardsd-hv-th28 ML21203A2702021-07-26026 July 2021 Presentation - 7-26-21 Meeting with STPNOC Proposed South Texas Project Moderator Temperature Coefficient TS Change ML20248H5322020-09-0404 September 2020 STP Nuclear Operating Company September 14, 2020, Presentation - Pre-Submittal Meeting for Proposed South Texas Project Moderator Temperature Coefficient Surveillance Requirement Technical Specification Change ML20125A3362020-05-0404 May 2020 STP Presubmittal Meeting Exigent Accumulator LAR 2020-05-05 Presentation L-2020-LRM-0039 ML20034E8192020-02-0606 February 2020 Pre-Application Public Meeting for Proposed License Amendment Request to Revise the STPEGS Emergency Plan ML19095A6562019-04-0404 April 2019 NRR E-mail Capture - (External_Sender) Handout for 4/10/19 Meeting to Discuss a Proposed Request for South Texas Project, Units 1 and 2, Regarding Repair of Piping Using Carbon Fiber Repair Methods ML17004A0292017-01-0404 January 2017 Slides for January 4, 2017, Public Meeting on South Texas Project's Resposne to Aluminum Bronze Aging Management Request for Additional Information ML16356A0612016-12-21021 December 2016 12/21/2016 South Texas Project Aluminum Bronze Aging Management Request for Additional Information ML16350A3272016-11-17017 November 2016 Transcript of Advisory Committee on Reactor Safeguards Plant License Renewal Subcommittee Meeting - November 17, 2016 ML16264A3632016-09-20020 September 2016 Pre-Application Public Meeting for Proposed License Amendment Request to Revise the STPEGS Emergency Plan Staff Augmentation Times ML16172A0192016-07-25025 July 2016 STP Aluminum Bronze Selective Leaching Public Meeting - June 21, 2016 ML16188A3682016-07-0606 July 2016 Audit Presentation - Westinghouse Methodology for South Texas Unit 1 LAR: Operation with 56 Control Rods ML16062A3042016-03-0202 March 2016 TS 5.3.2 LAR Pre-Submittal Meeting Presentation - March 2, 2016 ML16033A0042016-01-19019 January 2016 Applicant's Slides for STP Meeting on Aluminum Bronze Aging Management ML15334A3972015-11-30030 November 2015 TS 5 3 2 Emergency LAR Pre-Submittal Meeting Presentation ML15274A5992015-10-0101 October 2015 10-01-15 Public Phone Call ML15034A1512015-02-0505 February 2015 Integrated Leak Rate Test (ILRT) from 10 Years to 15 Years. NRC Public Meeting Slides - ILRT License Amendment ML15034A1142015-02-0404 February 2015 STP Risk- Informed Approach to GSI - 191 Roverd 2015 Meeting Blue 1 29 15 ML14192A9842014-08-0404 August 2014 Summary of Pre-Licensing Meeting with STP Nuclear Operating Company to Discuss Future License Amendment Request to Revise TS 6.9.1.6.b.9 to the Leading Edge Flow Meter Technology for Feedwater Flow Measurement ML14149A0892014-05-21021 May 2014 NRR E-mail Capture - STP-GSI-191 Presentation ML14120A0112014-04-29029 April 2014 4/29/2014 - South Texas Project Regulatory Approach for Risk-Informed Pilot Submittal Presentation Relating to 10 CFR 50.46c ML13352A1242013-12-16016 December 2013 NRC Staff Slides South Texas Project Risk-Informed Generic Safety Issue - 191, December 16, 2013 ML13352A1422013-12-16016 December 2013 GSI-191 Licensing Submittal Comparison of Changes Between Rev 1 and Rev 2 ML13316B9052013-11-13013 November 2013 Albrz Testing Update for NRR Final ML13150A2162013-05-23023 May 2013 Licensee Slides for 5/23/13 Public Meeting Regarding GSI-191 ML13140A2562013-05-20020 May 2013 Licensee Slides for 5/23/13 Meeting - STP Pilot Submittal for Risk Informed Approach to Resolving GSI-191 ML13023A3342013-02-25025 February 2013 1/15/2013 Summary of Public Meetings Conducted to Discuss Draft Supplemental Environmental Impact Statement Related to Review of South Texas Project, Units 1 & 2, License Renewal Application ML13051A8552013-02-20020 February 2013 Licensee Slides for 3/5/13 Pre-Application Meeting for Proposed Licensing Action to Revise the Fire Protection Program at STP ML13029A4972013-01-15015 January 2013 Slides - Preliminary Site-Specific Results of the Environmental Review for South Texas Project License Renewal ML12297A3312012-11-27027 November 2012 Summary of Prelicensing Meeting with STP Nuclear Operating Company to Discuss Proposed Amendment for Approval of Revised Fire Protection Program Related to Alternate Shutdown Capability for South Texas, Units 1 and 2 ML12264A3202012-10-11011 October 2012 Meeting Handout for 10/11/12 Pre-licensing Meeting License Amendment Request to Revise the Fire Protection Program ML1209004042012-03-30030 March 2012 3-27-2012 - STP Public Meeting Handout from Nuclear Innovation North America, LLC on Fukushima Lessons Learned for South Texas Project Units 3 and 4 ML1204400652012-02-0909 February 2012 Licensee Slides for 2/9/12 Meeting Regarding GSI-191 ML1133505632011-12-0101 December 2011 Licensee Presentation from 12/1/11 Meeting Via Conference Call to Discuss Risk-Informed GSI-191,Assessment of Debris Accumulation on Pressurized Water Reactor Sump Performance ML1130506322011-10-26026 October 2011 Licensee Handouts from November 1, 2011 Meeting with STP Nuclear Operating Company on GSI-191 ML1127701762011-10-0303 October 2011 Licensee Handouts from 10/3/11 Meeting STP LOCA Frequency ML1127702032011-10-0303 October 2011 Licensee Slides from 10/3/11 Meeting LOCA Frequencies, Final Results ML1123508832011-08-22022 August 2011 LOCA Initiating Event Frequencies and Uncertainties Status Report ML1123508732011-08-22022 August 2011 Models and Methods Used for Casa Grande ML1120707292011-07-26026 July 2011 Meeting Notice with South Texas Project, Units 1 and 2 - Licensee Slides Computational Fluid Dynamics Validation Plan ML1120707072011-07-26026 July 2011 Meeting Notice with South Texas Project, Units 1 and 2 - Licensee Slide Models and Methods Used for Casa Grande ML1118903802011-07-0707 July 2011 Licensee Slides, LOCA Initiating Event Frequencies and Uncertainties(Draft) ML1118904202011-07-0606 July 2011 Licensee Slide from 7/7/11 Meeting with STP Nuclear ML11157A0102011-06-0202 June 2011 STP Nuclear Operating Company, Licensee Handouts, 6/2/2011 Meeting Risk-Informed GSI-191 Closure Plan for GSI-191 Resolution ML1114501952011-05-24024 May 2011 Summary of Meeting with South Texas Project Electric Generating Station 2010 Performance ML1105503952011-02-22022 February 2011 Licensee Slides from 2/22/11 Public Meeting with STP Nuclear Operating Company ML1103206432011-01-27027 January 2011 1/27/11 Presentation on Risk-Informed GSI-191 Project Overview ML1021803392010-08-0505 August 2010 Ltr to E. Halpin Re Participation in Commission Meeting on the Resolution of Generic Safety Issue (GSI) - 191, Assessment of Debris Accumulation on Pressurized Water Reactor (PWR) Performance on 09/29/10 2022-08-31
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I - 's*-
Bottom Mounted Instrument Penetration Tube Condition Update 0
Uc z1 6/503 I STP Participants Tom Jordan VP, Engineering & Tech Services Mark McBumett Manager, Quality & Licensing Steve Thomas Manager, Plant Design Rick Gangluff Manager, Chemistry Michael Lashley Test Engineering Supervisor Bill Humble NSSS Supervisor Ron Baker Materials Specialist Wayne Harrison Licensing Engineer Ulhas Patil Design Engineer Steve Hunt Dominion Engineering John Broussard Dominion Engineering Chong Chiu Performance Improvement Intnl.
Ron Latanision Exponent Failure Analysis Assoc.
John Hall Westinghouse/CE 6/5103 2 I
Enclosure 1
INTRODUCTORY REMARKS Mark McBurnett Manager, Quality & Licensing 65/03 3 Agenda Introductory Remarks Mark McBumett Progress Summary Tom Jordan NDE Activities Michael Lashley Cause Analysis and Status Steve Thomas Repair Plan Steve Thomas Corrosion Assessment Rick Gangluff Concluding Remarks Mark McBumett 6/5/03 4 2
I Desired Meeting Outcomes
- NDE results and cause analysis are understood
- Future NDE and testing is understood
- Supporting analyses and schedule are understood
- Documents provided for submittal and inspection are understood
- Future NRC / STP meetings are identified
- NRC questions and needs are clearly understood 65/03 5 PROGRESS
SUMMARY
Tom Jordan Vice President, Engineering & Technical Services 6/5103 6 3
3 Summary Found residue on two BMI penetrations on April 12
-150 mg of residue on Penetration #1 3 mg of residue on Penetration #46 615103 7 6/5M 8 8/5103 8 4
Penetration #1 W5103 9 Penetration #46 6103 10 6/5103 10 5
Efforts to Date
- Completed inside vessel NDE
- Selected vendor; commenced design and preparations for half-nozzle repair
- Established cause investigation team using EPRI MRP FMEA technique
- Continuing with activities under the vessel 615/03 11 Overview of NDE Results
- UT and ECT revealed small axial cracks in #1 and #46, which confirmed leakage path
- No cracks found in other penetration tubes
- No surface breaking indication in any J-groove weld 6/5/03 12 6
Planned Activities
- Design and repair activities
- Sample removal and analysis
- Cause analysis 6/5/03 13 Key Points
- Careful, deliberate process
- Condition / repair scope known
- Repairs enable safe return to operation
- Close cooperation with industry and NRC on cause analysis 6/5/03 14 7
NDE ACTIVITIES Michael Lashley Test Engineering Supervisor 6/5/03 15 BMI Guide Tube Penetration l fr 6/5/03 16 8
Base Inspections Scope
- UT from penetration tube ID
- Enhanced visual exam of J-groove weld surface
- Volumetrically interrogate vessel base metal for wastage
- UT from the penetration tube ID
- Enhanced visual exam of J-groove weld surface 615103 17 STP BMI Approach follows EPRI MRP CRDM Approach
- Identify relevant flaw mechanisms
- Define inspection locations and volumes
- Define range of flaws to address
- Mockup design and procurement
- Demonstration protocol and schedule
- Non-blind I blind
- Detection / sizing I location
- False calls 615103 18 9
I 0k I.c I
6/5103 21 Confirmatory Inspection Scope
- ET from penetration tube ID
- ET of J-groove weld surface
- ET from the penetration tube ID of two other penetrations (2 & 6)
- ET of J-groove weld surface of six other penetrations (9, 12, 33, 34, 38 & 41) 6/5103 22 11
Activities April 21 - May 26
- Mockup fabrication (CIP samples & full scale mockup)
- Demonstration / vendor selection
- Demonstration / equipment checkout
- Confirmatory Inspections Demonstrations, base scope inspections, and confirmatory inspections were witnessed by NRC Inspection Team 615103 23 Summary of Results
- Three axial indications, one leak path
- No crack-like indications on J-Groove weld
- Visual grinding marks in side of tube
- Two axial indications, one leak path
- No crack-like indications on J-Groove weld 6/5103 24 12
Penetration #1 615/03 25 Penetration #46 615103 26 13
UT Examination Probes
- O-degree mapping 615103 27 Time of Flight Diffracted (TOFD)
Receiver Transmitter 1l- IS Low-amplitude, secondary wave generated by excitation of flaw 6/5/03 28 14
-I CD Li EE t 0 I -n i;r
-o
--I Cr 0~
CD
.A i
Penetration #1 Weld Profile N _. , t i' ftam DIthf 12 f THY -OaAt t 1i" >
h4 ,X, g I'e . <1 A
~~~ftI tu { f :, , Bgit i ., l 6/5103 31 Penetration #1 Leak Path swm*
40 120 In0 m4 SW
- 2.6 -- - - - - - - - - -- - - ----. ........ - -- ---- -----.. A'--'
145 ------ i '. : - : .
--- 1
_l_2_*-*-14.l. *l011 .... IZ 13.14 is-16 17_En_ _ RI 6/5/03 32 16
Penetration #46 Axial Scan 6/503 33 Penetration #46 Leak Path
. ,a.... -c .I.
am o so I
1T711.T173TT1TT7j 34 615M06/5/03 34 17
~ ~~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
Penetration #34 Fabrication Discontinuity 6t5/03 35 615/03 35 Enhanced Visual 6/5/03 36 6/5/03 38 18
Penetration Overview W53 37 Penetration #1 Visual WSWE0 38 6/5103 38 19
Confirmatory Examinations
- Bobbin coil eddy current on penetration ID
- Penetration #1 displayed a tube ID surface-breaking flaw
- Penetration #46 displayed a tube ID sub-surface flaw
- Two other reference penetrations displayed no flaws
- Array coil eddy current on J-Groove weld
- Penetration 1, 46, 33 & 5 others scanned
- No flaws identified 615103 39 Eddy Current Probe Operation
- X coil windings l Pro don 19 1 o 7
- 1.6" coverage 615/03 40 20
Eddy Current Probe 6/5103 41 Eddy Current J-Groove Probe 6/5103 42 21
Calibration Setup
-i- A > alw e 10464 .*,.e I'- a... ..
6/5/03 43 Penetration 33 J-Groove exam 6/5103 22
Additional Confirmatory Inspections and Tests
- Wastage UT (phased array)
- Rod test
- Bubble test
- Profilometry
- Visual of tube ID
- Visual of vessel bore
- Metallurgical sample
- Boat sample 615103 45 Developing Technology to Identify Wastage 6503 46 23
CAUSE ANALYSIS and STATUS Steve Thomas Manager, Plant Design 6/503 47 What Was Found
- Total of five flaws in the two nozzles
- One flaw in each nozzle provides a leak path
- Only one flaw fully penetrated nozzle
- Grinding marks 6/5/03 48 24
Other Observations
- No flaws in the 55* other nozzles
- No evidence of circumferential cracks
- No evidence of ID initiated cracks
- Penetration #31 will be examined during repair 615103 49 Mdd RP Feb. Md. d ERM Ad ho Rd. V-1o Heaet IW-U I--
. b e~ l i: -
I I .i 25
PWSCC May Not Be the Cause cx" I
ITta 615103 51 6/5/03 51 Tube Coldworking Not a Likely Contributor 1976 Combustion Engineering Nuclear Fabrication Practice 101-3-0 states:
5.8.1 REMINDER
Use the bull's eye level and alternate welds as necessary to insure alignment 5.8.4 Cold straighten, as necessary, all tubes which are out of alignment 6/5/03 52 26
615/03 53 Analysis Shows Minimal Displacement During Welding PIRTY 17 D .. D2
.iTU,00 M ..02114 xsrff.
V -i 6Z57 .2 5 sr . 3.045 A-ZS.5 6/5/03 54 27
Conclusion Coldworking is not a significant contributing factor 6/5/03 55 Axial Scan of Penetration 46 with Flaws Overlayed 8.11 Z(in) 15.62 615/03 56 6/5/03 56 28
Most Likely Causes
- Residual fabrication stresses
- J-groove weld grinding, welding, welding rework
- Lack of J-groove weld fusion to nozzle OD
- Weld cracking; fabrication defects / contaminants
- Combination of one or more with PWSCC 615103 57 Root Cause Focus I
cwdknO, I
615/03 58 29
Planned Additional Testing
- Volumetric UT of vessel around #1 and #46
- Visually examine inside bore #1 and #46
- Perform after nozzle capped and separated
- Possibly detect irregularities
- Look for known through-wall flaw in #1 615103 59 Planned Additional Testing (cont'd)
- Eddy current profilometry of #1 and #46
- Performed from the bottom after nozzle is capped and separated from guide tube
- Captures data on ID characteristics like ovalization at J-groove weld zone
- Visual exam of vessel at #1 and #46 after portion of old nozzle removed 615103 60 30
II Planned Additional Testing (cont'd)
- Metallurgical analyses of removed nozzle ends
- Boat samples from #1-and #46 flaw zones 6/5103 61 Repair and Startup Are Safe
- Inspections limit repair scope to the two leaking nozzles
- Extensive NDE reveals no flaws in other nozzles 615/03 62 31
Repair and Startup Are Safe (cont'd)
- Regardless of final root cause, half-nozzle repair is the appropriate corrective action
- Bounds potential causes
- Establishes new ASME Code pressure boundary
- Utilizes proven industry process
- Upgrades material to Alloy 690 6/5103 63 Repair and Startup Are Safe (cont'd)
- Evaluation of evidence indicates minor nozzle leakage is worst potential consequence 6/503 64 32
r I Severe Consequences Not Likely Small Break Loss of Coolant Accident (SBLOCA)
- Residual stresses favor axial crack orientation
- No circumferential cracks 6/5103 65 Flaw Locations and Stresses TV d le, Asoxioem
.. X-f~1C&
6/5)03 VM& Airm. *Wmo VhFl IXAke. aW6 66
%1.s tk Mfirm PwLis o I Pb dai or Wdl 33
Severe Consequences Not Likely (cont'd)
Small Break Loss of Coolant Accident (SBLOCA)
- Residual stresses favor axial crack orientation
- No circumferential cracks
- Robust design
- Limiting flaw size 615/03 67 Limiting Flaw Size 6/ 10 }8 34
Severe Consequences Not Likely (cont'd)
Small Break Loss of Coolant Accident (SBLOCA)
- Residual stresses favor axial crack orientation
- No circumferential cracks
- Robust design
- Limiting flaw size
- Very large safety factor
- Bare metal inspection
- Leak before break 6/5)03 69 Severe Consequences Not Likely (cont'd)
No evidence of vessel wastage
- No significant iron in residue
- No wastage residue
- No visual indication
- Confirmed by UT 615J03 - 70 35
Severe Consequences Not Likely (cont'd)
Loose Parts
- No flaws above weld
- No circumferential flaw
- Residual stresses favor axial crack orientation 6/5/03 71 Conclusions
- Repair scope limited to #1 and #46
- Repair bounds likely causes
- Root cause will determine monitoring plan 6/5/03 72 36
REPAIR PLAN Steve Thomas Manager, Plant Design
@5103 73 Half-Nozzle Repair 6503 74 37
Deploy Plug; Cut Guide Tube / Nozzle STEP 1 6/5/03 AsqE YHR.SLE O.,e tUBE 7!5 Inspect for Leaks 615/03 STEP 2 76 INSPECT FOR LEAKS 38
Cut Nozzle Flush with Head mm OR FM STEP3 6/5/03 ONE 77 K MD FMK Form Weld Pad and NDE TOOuNG r PLIVOR 6/103 STEP 4 78 WELDPAD.
39
Machine Bore and Form Weld Prep STEP 5 615103 iCRR eOn7 79 FORMWEmDPREP Install Nozzle; Weld; NDE WLD m UP STEP 6/5103 .SI0 80 40
Install Tube; Weld; NDE; Remove Plug STEP 7 Nll tall:E GOt IOC 615103 -<. ' By 81 Analyses Supporting Repair Residual Stress &
Urniting Flaw Analysis Crack groth analysis to assure integrlty d shell Corrosion analysis ASME Design and Analysis is consistent with the ASME Stress Analysis original reactor vessel ASME Fatigue Analysis requirements 6/5/03 82 41
CORROSION ASSESSMENT Rick Gangluff Manager, Chemistry 615103 83 Half-Nozzle Replacement Corrosion Assessment
- Small gap between Alloy 600 remnant and new Alloy 690 nozzle
- Corrosion rates are very low (1.5 mil/yr) 615/03 84 42
Corrosion Rates Addressed by CEOG for Nozzle Replacement
- SER issued for Rev. 0 of CEOG Report
- NRC found CEOG report methods and analyses to be acceptable
- STP plant-specific analyses in accordance with SER nearing completion 6/5103 85 BMI General Corrosion Acceptable
- Corrosion rate identified in report acceptable for STP based on projected capacity factors
- Lifetime increase in diameter
- 24 years 0.073"
-44 years 0.135"
- Less than most limiting nozzle 6/5103 86 43
CONCLUDING REMARKS Mark McBurnett Manager, Quality & Licensing 6/5103 87 Deliverables Nozzle finite element stress analysis Avail.
Flaw size limits to prevent net section collapse Avail.
NRC site review visit TBD Submit LER 6-12 NDE inspection report 6-14 Design change (Section 1i1, Section XI, corrosion) 6-14 Annulus dilation analysis 6-15 Submit temper bead relief request 6-17 Nozzle inservice acceptability analysis 6-30 615/03 88 44
- 3 Deliverables (cont'd)
Preliminary cause report (FMEA summary, bounding cause, safety significance, corrective action, monitoring plan) 7-12 Rockville meeting (cause report)
Public meeting at STP Relief request approval Half-nozzle lab analysis report 9-21 Boat sample analysis report 9-21 Submit LER supplement (final cause report summary) 10-12 615103 89 Conclusions
- Condition/repair scope known
- Repairs enable safe return to operation
- Continued close cooperation with industry and NRC on cause analysis 615103 90 45