ML15222A547

GSI 191 Program Chemical Effects Testing Update Option 2b Closure Approach

ML15222A547
Person / Time
Site:	Calvert Cliffs
Issue date:	08/31/2015
From:	Exelon Generation Co
To:	Chereskin A N Plant Licensing Branch 1
Alexander Chereskin, 415-2549
References
Download: ML15222A547 (14)

Text

Calvert Cliffs GSI-191 Program Chemical Effects Testing Update Option 2b Closure Approach August 2015 Agenda Introductions Objectives for Meeting Discussion of Chemical Effects Test Plans Discussion of Option 2b Simplified Risk-Informed Closure Plan Refined Debris Generation Topics Strainer Head Loss Testing Strainer Head Loss Correlation Staff Questions & Concerns Schedule for Future Periodic Meetings Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan 1 CCNPP Attendees Andre Drake Lead Responsible Engineer GSI-191 Anne Elliott Mechanical Design Engineer Ken Greene Licensing Engineer Craig Sellers Project Manager GSI-191 Steve Kinsey Chemical Effects Testing Eric Federline Project Support & Testing Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan 2 Objectives of this Meeting Status of CHLE Testing Status of Risk-Informed Approach Refined Debris Generation Topics Strainer Head Loss Testing Strainer Head Loss Correlation Capture Staff Issues and Concerns Discuss Next Steps Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan 3 Status of CHLE Testing First Integrated Test Initiated April 17, 2015 Detector Bed Head Loss Immediately Started Increasing Head loss increased until the test was terminated Started at 1.44 ft Test terminated at 10.25 ft, and rising Test lasted approximately 4.6 hrs Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan 4 Status of CHLE Testing (continued) Performed Multiple Investigatory Tests Investigatory Head Loss Testing of Materials Baked Nukon Binder Water Notable Head Loss Impact Unbaked Nukon Water No Notable Head Loss Impact Marinite Board Notable Head Loss Impact Dimetcote 9 IOZ Powder Notable Head Loss Impact Mineral Wool No Notable Head Loss Impact Chemical Analysis of Filtered Material Mineral wool particles - Observed Lead particles Analyzing Aluminosilicate Clay Analyzing Organic Material Analyzing, Believed to be Binder from Fiberglass Head Loss Increase Due to Particulate Migration to Debris Bed Detector Debris Bed Significantly Smaller than Equivalent Installed Strainer 2% of full strainer surface area 12% of circumscribed strainer surface area Much more susceptible to particulate head loss increase Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan 5 Simplified Risk-Informed Approach Identify Applicable Strainer Chemical Effects Head Loss Test WCAP-16530 Chemical Surrogates Identify Smallest Double-Ended Guillotine Break(s) that Generate Equivalent Quantity of Fine Fibrous Debris as used in Applicable and Acceptable Head Loss Test Smaller Breaks Acceptable Through Deterministic Analysis Larger Breaks Addressed Probabilistically (Risk-Informed) Two Independent Parallel Analysis Produced Same Positive Results ETRANCO Influence Matrix Approach ENERCON NARWHAL Analysis Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan 6 Refined Debris Generation Topics Debris Size Distribution for Mineral Wool and Generic Fiberglass CCNPP Has Assumed Mineral Wool and Generic Fiberglass Debris was 100% Fines CCNPP Desires to Use a 4-Size Debris Distribution for these insulation types Fines, Small Pieces, Large Pieces, and Intact Pieces NRC Accepted 4-Size Debris Distribution for these insulation types at Indian Point [ML082050433, ML093290316, and ML101170237] Mineral wool and generic fiberglass have higher density than NUKON and Thermal Wrap Less Mineral wool and generic fiberglass debris than NUKON and Thermal Wrap CCNPP Insulation Densities NUKON & Thermal Wrap: 2.4 lbm/ft3 Mineral Wool: 8 lbm/ft3 Generic Fiberglass: 3.5 lbm/ft3 to 5.5 lbm/ft3 Mineral Wool and Generic Fiberglass Higher Densities than NUKON and Thermal Wrap CCNPP Debris Quantities NUKON & Thermal Wrap: 1,902 ft3 - 4,565 lbm Generic Fiberglass: 248 ft3 - 1,363 lbm (based on 5.5 lbm/ft3 maximum density) Mineral Wool: 61.5 ft3 - 492 lbm Mineral Wool and Generic Fiberglass Smaller Quantities than NUKON and Thermal Wrap Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan 7 Strainer Head Loss Testing CCNPP Conducted 7 Strainer Head Loss Tests in 2010 Tests included WCAP-16530 Chemical Precipitate Surrogate Test #1 Included Fine and Small Fibrous Debris Maximum Head Loss 1.75 inches of water Non-Uniform Debris Deposition

Conclusion:

Testing with Small Pieces is Non-Conservative Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan 8 Strainer Head Loss Testing (continued) Remaining Tests Used Only Fine Fibrous Debris Full load of particulates and precipitates Test for Success Campaign Break-throughs experienced during each test Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan 9 Strainer Head Loss Testing (continued) Tests included same insulation types as installed in plant EXCEPT no mineral wool was included in tests Test for success campaign based on multiple insulation replacement schemes all of which included 100% replacement of mineral wool Significantly larger particulate load used in test. CCNPP particulate source term reduced since 2010 Mineral wool <10% of fiber debris source term CHLE investigatory tests showed no notable head loss impact from mineral wool Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan 10 Strainer Head Loss Correlation Plot of Head Loss vs- Fiber Mass produces well correlated curve fit Plot includes clean strainer head loss Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan 11 y = 0.0803e2.1877x R² = 0.9939 00.511.522.533.5400.511.52Head Loss (ft-water) Debris Mass (kg) Head Loss Data - Test Data + Clean Screen Questions/Concerns Jointly Review Issues, Questions, and Concerns for Future Communication Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan 12 Next Steps Update Debris Generation Calculations Present Risk-Informed GSI-191 Analysis Results Desire Next Meeting October 2015 Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan 13