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:	Alexander Chereskin 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 1 Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan

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 2 Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan

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 3 Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan

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 11 Vertical Loop Online (t = 0.9 hrs)

High Range DP Cell Higher Range DP Cell Start of test (t = 0 hrs) 10 Pegged (t = 3.7 hrs) 9 Installed (t = 4.3 hrs) 8 7

Head Loss [ft]

6 5

4 3

2 1

0 4 Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan

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 5 Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan

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 6 Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan

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 7 Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan

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 8 Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan

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 9 Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan

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 10 Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan

Strainer Head Loss Correlation

• Plot of Head Loss -vs- Fiber Mass produces well correlated curve fit

• Plot includes clean strainer head loss Head Loss Data - Test Data + Clean Screen 4

3.5 3

Head Loss (ft-water) 2.5 y = 0.0803e2.1877x R² = 0.9939 2

1.5 1

0.5 0

0 0.5 1 1.5 2 Debris Mass (kg) 11 Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan

Questions/Concerns

• Jointly Review Issues, Questions, and Concerns for Future Communication 12 Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan

Next Steps

• Update Debris Generation Calculations

• Present Risk-Informed GSI-191 Analysis Results

• Desire Next Meeting - October 2015 13 Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan