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| | number = ML16095A078 | | | number = ML16095A078 |
| | issue date = 04/12/2016 | | | issue date = 04/12/2016 |
| | title = Slides for the WCGS Meeting Discussion 4/12/16 (CAC No. MC4731) | | | title = Slides for the WCGS Meeting Discussion 4/12/16 |
| | author name = Lyon C F | | | author name = Lyon C |
| | author affiliation = NRC/NRR/DORL/LPLIV-1 | | | author affiliation = NRC/NRR/DORL/LPLIV-1 |
| | addressee name = | | | addressee name = |
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| | docket = 05000482 | | | docket = 05000482 |
| | license number = | | | license number = |
| | contact person = Lyon C F, NRR/DORL/LPLIV-1 | | | contact person = Lyon C, NRR/DORL/LPLIV-1 |
| | case reference number = CAC MC4731 | | | case reference number = CAC MC4731 |
| | document type = Meeting Briefing Package/Handouts, Slides and Viewgraphs | | | document type = Meeting Briefing Package/Handouts, Slides and Viewgraphs |
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| {{#Wiki_filter:Fiber Penetration and Head Loss Testing Approach Meeting with NRC April 12, 2016 1 Outline *Purpose of Meeting -Communicate Wolf Creek testing approach for fiber penetration and strainer head loss *Agenda -Overview of Wolf Creek Testing Program -Fiber Penetration Testing Approach -Strainer Head Loss Testing Approach 2 Strainer B Strainer A Overview of Sump Strainers 3 Overview of Testing Program *Perform tank tests at Alden for fiber penetration and strainer head loss *Use prototypical strainer modules for head loss testing *Modify prototypical strainer modules for penetration testing to eliminate bridging *Test strainer modules have same disk size, perforation size and core tube diameter as the plant strainer *Maintain turbulence level for complete transport of fine debris 4 Flow Direction Debris Introduction | | {{#Wiki_filter:Fiber Penetration and Head Loss Testing Approach Meeting with NRC April 12, 2016 1 |
| & Mixing Section Plenum Box Test Strainer To Flow Loop Overview of Testing Program (cont'd) *Use methods previously reviewed by the NRC -Similar to recent tank tests for Florida Power & Light at Alden witnessed by the NRC staff *Follow NEI guidance on fibrous debris preparation* *Determine threshold debris load that meets in-vessel and head loss criteria using test results *Projected test start date: May 9, 2016 5 ZOI Fibrous Debris Preparation: Processing, Storage and Handling, Rev. 1, Jan 2012 (ADAMS Accession No. ML120481057)
| | |
| Fiber Penetration Testing Approach *Perform a fiber-only penetration test *Collect time-dependent fiber penetration data considering prompt and long-term penetration *Develop a curve fit from testing data to characterize rates of prompt and long-term penetration *Apply curve fit to quantify total fiber penetration for the fiber load of each break at bounding plant conditions *Determine compliance with the in-vessel fibrous debris quantity limit (WCAP-17788) *Perform 30-day extrapolation for total fiber penetration as input to ex-vessel downstream effects analysis 6 Prevent Bridging for Penetration Testing *Modified prototype strainer to eliminate possible bridging of fiber between adjacent disks, and between the strainer and its surrounding walls *Preventing bridging in fiber-only penetration testing allows fiber to reach the perf plates and is conservative 7 *Test strainer module modification -Remove every other disk -Remove seismic cables -Increase distance between edges of test strainer and surrounding walls *Measured fiber penetration per unit area will be applied to the plant strainer surface area Penetration Testing Conditions *Prototypical pool chemistry at max pH (9.6) *Testing temperature 120F +/- 5F *Max strainer approach velocity (0.00612 ft/s) *Prototypical fibrous debris concentrations -Pool fiber concentration defined as total fiber quantity divided by pool volume -Fiber concentration in test tank maintained at or below the prototypical value to allow debris bed to form slowly 8 Fiber Preparation and Introduction *Only fines will be used for penetration testing -Nukon sheets baked single-sided into half thickness and cut into 2" x 2" cubes -Debris preparation per the latest NEI Guidance* *Fiber will be added to the test tank in batches *Batching size will increase gradually to facilitate fiber bed formation on test strainer *Total test fiber quantity will bound the max fiber load of largest DEGB 9 ZOI Fibrous Debris Preparation: Processing, Storage and Handling, Rev. 1, Jan 2012 (ADAMS Accession No. ML120481057) | | Outline |
| Collect Time-Dependent Penetration Data *Penetrated fiber collected in 5-m filter bags *Each batch begins with a set of clean bags *To measure long-term penetration, extended runtime and multiple bag changes will be done for selected batches *Total runtime of the test exceeds duration from start of an accident to hot leg recirculation switchover *A curve-fit will be developed to adequately model and bound testing results *The curve-fit characterizes both prompt and long-term penetration 10 Head Loss Testing Approach *Measure debris bed head loss for debris loading of various break sizes on a prototypical test module -No modifications to test modules as done for penetration testing *Chemical debris will not be added until all conventional debris has been introduced to test tank and head loss allowed to stabilize *Perform flow sweeps for adjusting measured head losses to plant conditions -After adding all conventional debris and at end of test 11 Head Loss Testing Approach (cont'd) *Perform temperature sweep after adding all conventional debris to characterize debris bed *Head Loss Test Conditions: -Prototypical sump water chemistry at min pH (8.7) -Test temperature approximately 120F +/- 5F -Approach velocity from max strainer flow rate and net strainer surface area (0.00615 ft/s) *Two head loss tests planned -Test 1: Full Debris Load Test -Test 2: Thin Bed Test -Contingency test may be conducted depending on results of previous tests 12 Test 1: Full Debris Load Test *Fibrous and particulate debris batched into test tank as homogeneous mixtures *Addition of conventional debris ends when head loss is near prescribed value based on pump NPSH margin and strainer structural limit *No alternating additions of fiber fines and small pieces 13 Test 1: Full Debris Load Test (cont'd) *Cumulative conventional debris quantities of intermediate batches match debris loads of multiple break sizes -Head loss allowed to stabilize before continuing addition *Chemical debris batched into test tank after completing all conventional debris addition -Head loss allowed to stabilize after each addition 14 Test 2: Thin Bed Test *Particulate debris load for Test 2 will be informed by the threshold breaks identified in Test 1 *Particulate debris added to test tank at the beginning of test *Nukon fiber fines added in batches until thin-bed conditions are met *Chemical debris batched in afterwards 15 Test Debris Types Test Materials Debris Types at Plant Nukon *Nukon Insulation *Latent Fiber *Cerablanket *Fibrous Content of Thermolag Pulverized Acrylic or Silicon Flour (10 m) *IOZ, Epoxy and Alkyds *Foamglas *Particulate Content of Thermolag PCI PWR Dirt/Dust Mix* Latent Particulate Aluminum Oxyhydroxide Aluminum Precipitate Debris 16 The size distribution of "PCI PWR Dirt/Dust Mix" meets requirements in Appendix VII of NEI 04-07 for surrogate of latent particulate debris Quantity of Chemical Debris *Evaluated chemical precipitate quantities using deterministic method per WCAP-16530-NP-A -Max sump pool mass and temperature to increase aluminum release -Max pH to increase aluminum release -Conservatively higher aluminum inventory -Max quantities of E-Glass of largest DEGB 17 Closing *Wolf Creek is planning to use methods previously reviewed by the NRC staff *Penetration data will be used to develop a curve fit that can be applied to any debris load (up to max for WCNOC) *Head Loss test results will establish a threshold debris load *Analysis will determine the threshold debris load that meets both the in-vessel and head loss criteria *Threshold debris load will determine the break sizes that pass deterministically 18 Closing *Questions? 19 | | * Purpose of Meeting |
| }} | | - Communicate Wolf Creek testing approach for fiber penetration and strainer head loss |
| | * Agenda |
| | - Overview of Wolf Creek Testing Program |
| | - Fiber Penetration Testing Approach |
| | - Strainer Head Loss Testing Approach 2 |
| | |
| | Overview of Sump Strainers Strainer A Strainer B 3 |
| | |
| | Overview of Testing Program |
| | * Perform tank tests at Alden for fiber penetration and Flow strainer head loss Direction |
| | * Use prototypical strainer Test modules for head loss testing Strainer |
| | * Modify prototypical strainer modules for penetration Debris Introduction testing to eliminate bridging & Mixing |
| | * Test strainer modules have Section same disk size, perforation size and core tube diameter Plenum as the plant strainer Box |
| | * Maintain turbulence level for complete transport of fine To Flow debris 4 Loop |
| | |
| | Overview of Testing Program (contd) |
| | * Use methods previously reviewed by the NRC |
| | - Similar to recent tank tests for Florida Power & Light at Alden witnessed by the NRC staff |
| | * Follow NEI guidance on fibrous debris preparation* |
| | * Determine threshold debris load that meets in-vessel and head loss criteria using test results |
| | * Projected test start date: May 9, 2016 ZOI Fibrous Debris Preparation: Processing, Storage and Handling, Rev. 1, Jan 2012 (ADAMS Accession No. ML120481057) 5 |
| | |
| | Fiber Penetration Testing Approach |
| | * Perform a fiber-only penetration test |
| | * Collect time-dependent fiber penetration data considering prompt and long-term penetration |
| | * Develop a curve fit from testing data to characterize rates of prompt and long-term penetration |
| | * Apply curve fit to quantify total fiber penetration for the fiber load of each break at bounding plant conditions |
| | * Determine compliance with the in-vessel fibrous debris quantity limit (WCAP-17788) |
| | * Perform 30-day extrapolation for total fiber penetration as input to ex-vessel downstream effects analysis 6 |
| | |
| | Prevent Bridging for Penetration Testing |
| | * Modified prototype strainer to eliminate possible bridging of fiber between adjacent disks, and between the strainer and its surrounding walls |
| | * Preventing bridging in fiber-only penetration testing allows fiber to reach the perf plates and is conservative |
| | * Test strainer module modification |
| | - Remove every other disk |
| | - Remove seismic cables |
| | - Increase distance between edges of test strainer and surrounding walls |
| | * Measured fiber penetration per unit area will be applied to the plant strainer surface area 7 |
| | |
| | Penetration Testing Conditions |
| | * Prototypical pool chemistry at max pH (9.6) |
| | * Testing temperature 120°F +/- 5°F |
| | * Max strainer approach velocity (0.00612 ft/s) |
| | * Prototypical fibrous debris concentrations |
| | - Pool fiber concentration defined as total fiber quantity divided by pool volume |
| | - Fiber concentration in test tank maintained at or below the prototypical value to allow debris bed to form slowly 8 |
| | |
| | Fiber Preparation and Introduction |
| | * Only fines will be used for penetration testing |
| | - Nukon sheets baked single-sided into half thickness and cut into 2 x 2 cubes |
| | - Debris preparation per the latest NEI Guidance* |
| | * Fiber will be added to the test tank in batches |
| | * Batching size will increase gradually to facilitate fiber bed formation on test strainer |
| | * Total test fiber quantity will bound the max fiber load of largest DEGB ZOI Fibrous Debris Preparation: Processing, Storage and Handling, Rev. 1, Jan 2012 (ADAMS Accession No. ML120481057) 9 |
| | |
| | Collect Time-Dependent Penetration Data |
| | * Penetrated fiber collected in 5-µm filter bags |
| | * Each batch begins with a set of clean bags |
| | * To measure long-term penetration, extended runtime and multiple bag changes will be done for selected batches |
| | * Total runtime of the test exceeds duration from start of an accident to hot leg recirculation switchover |
| | * A curve-fit will be developed to adequately model and bound testing results |
| | * The curve-fit characterizes both prompt and long-term penetration 10 |
| | |
| | Head Loss Testing Approach |
| | * Measure debris bed head loss for debris loading of various break sizes on a prototypical test module |
| | - No modifications to test modules as done for penetration testing |
| | * Chemical debris will not be added until all conventional debris has been introduced to test tank and head loss allowed to stabilize |
| | * Perform flow sweeps for adjusting measured head losses to plant conditions |
| | - After adding all conventional debris and at end of test 11 |
| | |
| | Head Loss Testing Approach (contd) |
| | * Perform temperature sweep after adding all conventional debris to characterize debris bed |
| | * Head Loss Test Conditions: |
| | - Prototypical sump water chemistry at min pH (8.7) |
| | - Test temperature approximately 120°F +/- 5°F |
| | - Approach velocity from max strainer flow rate and net strainer surface area (0.00615 ft/s) |
| | * Two head loss tests planned |
| | - Test 1: Full Debris Load Test |
| | - Test 2: Thin Bed Test |
| | - Contingency test may be conducted depending on results of previous tests 12 |
| | |
| | Test 1: Full Debris Load Test |
| | * Fibrous and particulate debris batched into test tank as homogeneous mixtures |
| | * Addition of conventional debris ends when head loss is near prescribed value based on pump NPSH margin and strainer structural limit |
| | * No alternating additions of fiber fines and small pieces 13 |
| | |
| | Test 1: Full Debris Load Test (contd) |
| | * Cumulative conventional debris quantities of intermediate batches match debris loads of multiple break sizes |
| | - Head loss allowed to stabilize before continuing addition |
| | * Chemical debris batched into test tank after completing all conventional debris addition |
| | - Head loss allowed to stabilize after each addition 14 |
| | |
| | Test 2: Thin Bed Test |
| | * Particulate debris load for Test 2 will be informed by the threshold breaks identified in Test 1 |
| | * Particulate debris added to test tank at the beginning of test |
| | * Nukon fiber fines added in batches until thin-bed conditions are met |
| | * Chemical debris batched in afterwards 15 |
| | |
| | Test Debris Types Test Materials Debris Types at Plant Nukon |
| | * Nukon Insulation |
| | * Latent Fiber |
| | * Cerablanket |
| | * Fibrous Content of Thermolag Pulverized Acrylic or |
| | * IOZ, Epoxy and Alkyds Silicon Flour (10 µm) |
| | * Foamglas |
| | * Particulate Content of Thermolag PCI PWR Dirt/Dust Mix* Latent Particulate Aluminum Oxyhydroxide Aluminum Precipitate Debris The size distribution of PCI PWR Dirt/Dust Mix meets requirements in Appendix VII of NEI 04-07 for surrogate of latent particulate debris 16 |
| | |
| | Quantity of Chemical Debris |
| | * Evaluated chemical precipitate quantities using deterministic method per WCAP-16530-NP-A |
| | - Max sump pool mass and temperature to increase aluminum release |
| | - Max pH to increase aluminum release |
| | - Conservatively higher aluminum inventory |
| | - Max quantities of E-Glass of largest DEGB 17 |
| | |
| | Closing |
| | * Wolf Creek is planning to use methods previously reviewed by the NRC staff |
| | * Penetration data will be used to develop a curve fit that can be applied to any debris load (up to max for WCNOC) |
| | * Head Loss test results will establish a threshold debris load |
| | * Analysis will determine the threshold debris load that meets both the in-vessel and head loss criteria |
| | * Threshold debris load will determine the break sizes that pass deterministically 18 |
| | |
| | Closing |
| | * Questions? |
| | 19}} |
Letter Sequence Meeting |
|---|
|
|
MONTHYEARML16095A0922016-03-31031 March 2016
Large Scale Penetration and Head Loss Test Plan 4/12/16
Project stage: Other
ML16095A0782016-04-12012 April 2016
Slides for the WCGS Meeting Discussion 4/12/16
Project stage: Meeting
ML16095A0852016-04-12012 April 2016
Large Scale Head Loss Test Specification 4/12/16
Project stage: Other
ML16095A0802016-04-12012 April 2016
Large Scale Penetration Test Specification 4/12/16
Project stage: Other
ML16106A1742016-04-22022 April 2016
Summary of Meeting with Wolf Creek Nuclear Operating Company to Discuss the Generic Safety Issue (GSI)-191 Testing Plan/Fiber Penetration and Head Loss Testing Approach for Wolf Creek Generating Station
Project stage: Meeting
2016-04-12
[Table View] |
|
|---|
Category:Meeting Briefing Package/Handouts
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Summary of Regulatory Conference to Discuss Safety Significance of Wolf Creek Generating Station Emergency Generator Excitation Diode Apparent Violation
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Large Scale Head Loss Test Specification 4/12/16
ML16095A0802016-04-12012 April 2016
Large Scale Penetration Test Specification 4/12/16
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Large Scale Penetration and Head Loss Test Plan 4/12/16
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1/22/2014 - Summary of Public Meeting to Discuss Corrective Actions Implemented to Address the Chilling Effect Letter
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6/25/2012 Summary of Public Meeting with Wolf Creek Nuclear Operating Corporation
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Summary of Annual Performance Assessment Meeting with Wolf Creek Nuclear Operating Corporation to Discuss Wolf Creek Generating Station Performance for the NRC Inspection Period Ending December 31, 2010
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Notice of Construction Reactor Oversight Process Category 2 Public Meeting Handout: Wolf Creek 2, Notice of Violation and Proposed Imposition of Civil Penalty, Dated 11/21/1984
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Summary of Annual Performance Assessment Meeting with Wolf Creek Nuclear Operating Corporation to Discuss the Wolf Creek Generating Station Performance for the NRC Inspection Period from January 1 Through December 31, 2009
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Summary of Public Meeting for Wolf Creek Generating Station
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Licensee Handouts from November 20, 2009, Public Meeting with Union Electric Company and Wolf Creek Nuclear Operating Company to Discuss GL 2004-02 Response Rai'S
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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
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Industry Presentation Slides: MRP-139 Analysis Basis
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2023-10-16
[Table view]
Category:Slides and Viewgraphs
MONTHYEARML23275A1712023-10-16016 October 2023
October 16, 2023, Licensee Pre-submittal Meeting Slides - License Amendment Request to Revise Technical Specifications to Adopt Risk-Informed Completion Times TSTF-505-A, Revision 2 for Wolf Creek Generating Station
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Slides for the WCGS Meeting Discussion 4/12/16
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Operating Corporation - Slides for Pre-application Meeting on 7/30/13 - Core Design and Safety Analysis Methodology Transition License Amendment Request for Wolf Creek Generating Station
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6/16/2010 Construction Reactor Oversight Process Category 2 Public Meeting Handout: Meeting Slides (Enforcement Cases)
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Summary of Annual Performance Assessment Meeting with Wolf Creek Nuclear Operating Corporation to Discuss the Wolf Creek Generating Station Performance for the NRC Inspection Period from January 1 Through December 31, 2009
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Summary of Public Meeting for Wolf Creek Generating Station
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Licensee Handouts from November 20, 2009, Public Meeting with Union Electric Company and Wolf Creek Nuclear Operating Company to Discuss GL 2004-02 Response Rai'S
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Meeting Slides, Successful Licensing of the Als Fpga Based Safety Related I&C Platform
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Slides, Category 2 Public Meeting Digital Instrumentation and Control Steering Committee
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05/01/2008-Summary of Public Meeting on Safety Evaluation Report with Open Items Regarding the Wolf Creek Generating Station License Renewal Review
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Performanc Contracting, Inc.'S Powerpoint Slide, Proposed Wolf Creek/Callaway Test Configuration
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Slides from Meeting Between NRC Staff and Wolf Creek Panel Enclosures 2 to 3, Advanced Fea Crack Growth Calculations for Evaluation of PWR Pressurizer Nozzle Dissimilar Metal Weld Circumferential Pwscc.
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Handouts (NRC and Licensee) for Meeting with Representatives of Wolf Creek Nuclear Operating Corporation
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06/19-20/2007 Slides,Fabrication Records Review, from Category 2 Public Meeting Between the NRC Staff and the Expert Panel for the Wolf Creek Advanced Finite Element Analyses (Fea)
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05/31/2007 Presentation by J. Cudsworth NRC Treatment of Issues Other than Category 2 Issues for License Renewal
ML0713703642007-05-17017 May 2007
Handout for Meeting with Wolf Creek Nuclear Operating Corporation on the Licensee'S Application for the Main Steam and Feedwater Isolation System (Msfis) Modification
ML0713506512007-05-0808 May 2007
Slides, Category 2 Public Meeting with NEI on the Implications of the Wolf Creek Dissimilar Metal Weld Inspections.
ML0713506532007-05-0808 May 2007
Slides, Recommendations for Critical Flaw Size Calculations (in Wolf Creek Advanced Fea Project).
ML0713603732007-05-0101 May 2007
Enclosure-1 05/01/2007 Dominion Engineering Presentation Advanced Fea Crack Growth Calculations for Evaluation of PWR Pressurizer Nozzle Dissimilar Metal Weld Circumferential Pwscc.
ML0713603962007-05-0101 May 2007
Enclosure 2-05/01/2007 Engineering Mechanics Corporation of Columbus Presentation, NRC Welding Residual Stress Solutions as Generated by Battelle and Emc2.
ML0701601892006-12-19019 December 2006
12/19/2006, Viewgraphs from Meeting with Wolf Creek Generating Station to Discuss License Renewal Process and Environmental Scoping
ML0635603462006-11-30030 November 2006
November 30, 2006 NRC Presentation Slides: Wolf Creek Flaw Evaluation
ML0635603582006-11-30030 November 2006
Industry Presentation Slides: MRP-139 Analysis Basis
ML0632100802006-11-16016 November 2006
Industry Presentations: Nov. 16, 2006 Public Meeting
ML0632100772006-11-16016 November 2006
NRC Presentation: NRC Perspective on Wolf Creek Inspection Results
ML0622804372006-08-16016 August 2006
Handouts from Wolf Creek Nuclear Operating Corporation and from Union Electric Company for Meeting with NRC on the Main Steam Isolation Valve (MSIV) Operability Determination
ML0618000292006-06-28028 June 2006
Handout for June 28, 2006, Meeting with Representatives of Wolf Creek Nuclear Operating Corporation for Wolf Creek Generating Station on the Main Steam and Feedwater Isolation System (Msfis) Controls Replacement Project
ML0615106012006-05-23023 May 2006
EPRI HRA Users Group Review of Draft NUREG-1842
ML0617902332006-03-0808 March 2006
RIC 2006 Presentation - W3D - Maurice E. Dingler - GSI 191
ML0516705662005-06-16016 June 2005
Summary of Annual Performance Assessment Meeting with NRC Re Oversight Process and Safety Performance at Wolf Creek Generating Station
2023-10-16
[Table view] |
Text
Fiber Penetration and Head Loss Testing Approach Meeting with NRC April 12, 2016 1
Outline
- Communicate Wolf Creek testing approach for fiber penetration and strainer head loss
- Overview of Wolf Creek Testing Program
- Fiber Penetration Testing Approach
- Strainer Head Loss Testing Approach 2
Overview of Sump Strainers Strainer A Strainer B 3
Overview of Testing Program
- Perform tank tests at Alden for fiber penetration and Flow strainer head loss Direction
- Use prototypical strainer Test modules for head loss testing Strainer
- Modify prototypical strainer modules for penetration Debris Introduction testing to eliminate bridging & Mixing
- Test strainer modules have Section same disk size, perforation size and core tube diameter Plenum as the plant strainer Box
- Maintain turbulence level for complete transport of fine To Flow debris 4 Loop
Overview of Testing Program (contd)
- Use methods previously reviewed by the NRC
- Similar to recent tank tests for Florida Power & Light at Alden witnessed by the NRC staff
- Follow NEI guidance on fibrous debris preparation*
- Determine threshold debris load that meets in-vessel and head loss criteria using test results
- Projected test start date: May 9, 2016 ZOI Fibrous Debris Preparation: Processing, Storage and Handling, Rev. 1, Jan 2012 (ADAMS Accession No. ML120481057) 5
Fiber Penetration Testing Approach
- Perform a fiber-only penetration test
- Collect time-dependent fiber penetration data considering prompt and long-term penetration
- Develop a curve fit from testing data to characterize rates of prompt and long-term penetration
- Apply curve fit to quantify total fiber penetration for the fiber load of each break at bounding plant conditions
- Determine compliance with the in-vessel fibrous debris quantity limit (WCAP-17788)
- Perform 30-day extrapolation for total fiber penetration as input to ex-vessel downstream effects analysis 6
Prevent Bridging for Penetration Testing
- Modified prototype strainer to eliminate possible bridging of fiber between adjacent disks, and between the strainer and its surrounding walls
- Preventing bridging in fiber-only penetration testing allows fiber to reach the perf plates and is conservative
- Test strainer module modification
- Remove every other disk
- Remove seismic cables
- Increase distance between edges of test strainer and surrounding walls
- Measured fiber penetration per unit area will be applied to the plant strainer surface area 7
Penetration Testing Conditions
- Prototypical pool chemistry at max pH (9.6)
- Testing temperature 120°F +/- 5°F
- Max strainer approach velocity (0.00612 ft/s)
- Prototypical fibrous debris concentrations
- Pool fiber concentration defined as total fiber quantity divided by pool volume
- Fiber concentration in test tank maintained at or below the prototypical value to allow debris bed to form slowly 8
Fiber Preparation and Introduction
- Only fines will be used for penetration testing
- Nukon sheets baked single-sided into half thickness and cut into 2 x 2 cubes
- Debris preparation per the latest NEI Guidance*
- Fiber will be added to the test tank in batches
- Batching size will increase gradually to facilitate fiber bed formation on test strainer
- Total test fiber quantity will bound the max fiber load of largest DEGB ZOI Fibrous Debris Preparation: Processing, Storage and Handling, Rev. 1, Jan 2012 (ADAMS Accession No. ML120481057) 9
Collect Time-Dependent Penetration Data
- Penetrated fiber collected in 5-µm filter bags
- Each batch begins with a set of clean bags
- To measure long-term penetration, extended runtime and multiple bag changes will be done for selected batches
- Total runtime of the test exceeds duration from start of an accident to hot leg recirculation switchover
- A curve-fit will be developed to adequately model and bound testing results
- The curve-fit characterizes both prompt and long-term penetration 10
Head Loss Testing Approach
- Measure debris bed head loss for debris loading of various break sizes on a prototypical test module
- No modifications to test modules as done for penetration testing
- Chemical debris will not be added until all conventional debris has been introduced to test tank and head loss allowed to stabilize
- Perform flow sweeps for adjusting measured head losses to plant conditions
- After adding all conventional debris and at end of test 11
Head Loss Testing Approach (contd)
- Perform temperature sweep after adding all conventional debris to characterize debris bed
- Head Loss Test Conditions:
- Prototypical sump water chemistry at min pH (8.7)
- Test temperature approximately 120°F +/- 5°F
- Approach velocity from max strainer flow rate and net strainer surface area (0.00615 ft/s)
- Two head loss tests planned
- Test 1: Full Debris Load Test
- Test 2: Thin Bed Test
- Contingency test may be conducted depending on results of previous tests 12
Test 1: Full Debris Load Test
- Fibrous and particulate debris batched into test tank as homogeneous mixtures
- Addition of conventional debris ends when head loss is near prescribed value based on pump NPSH margin and strainer structural limit
- No alternating additions of fiber fines and small pieces 13
Test 1: Full Debris Load Test (contd)
- Cumulative conventional debris quantities of intermediate batches match debris loads of multiple break sizes
- Head loss allowed to stabilize before continuing addition
- Chemical debris batched into test tank after completing all conventional debris addition
- Head loss allowed to stabilize after each addition 14
Test 2: Thin Bed Test
- Particulate debris load for Test 2 will be informed by the threshold breaks identified in Test 1
- Particulate debris added to test tank at the beginning of test
- Nukon fiber fines added in batches until thin-bed conditions are met
- Chemical debris batched in afterwards 15
Test Debris Types Test Materials Debris Types at Plant Nukon
- Fibrous Content of Thermolag Pulverized Acrylic or
- IOZ, Epoxy and Alkyds Silicon Flour (10 µm)
- Particulate Content of Thermolag PCI PWR Dirt/Dust Mix* Latent Particulate Aluminum Oxyhydroxide Aluminum Precipitate Debris The size distribution of PCI PWR Dirt/Dust Mix meets requirements in Appendix VII of NEI 04-07 for surrogate of latent particulate debris 16
Quantity of Chemical Debris
- Evaluated chemical precipitate quantities using deterministic method per WCAP-16530-NP-A
- Max sump pool mass and temperature to increase aluminum release
- Max pH to increase aluminum release
- Conservatively higher aluminum inventory
- Max quantities of E-Glass of largest DEGB 17
Closing
- Wolf Creek is planning to use methods previously reviewed by the NRC staff
- Penetration data will be used to develop a curve fit that can be applied to any debris load (up to max for WCNOC)
- Head Loss test results will establish a threshold debris load
- Analysis will determine the threshold debris load that meets both the in-vessel and head loss criteria
- Threshold debris load will determine the break sizes that pass deterministically 18
Closing
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