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CHLE UpdateSTP October Team Lead Meeting

11/29/2012Janet Leavitt, Ph.D.

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Overview

• T2 LBLOCA Results

• Bench Top Experiments

• NRC Call

Corrosion/precipitation scenario

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T2 LBLOCA• Objective

– Determine the mass of aluminum corrosion– Evaluate possible effects of key corrosion and dissolution materials on head

loss• Conditions

– 15” Temperature profile– 6.5 hr spray– Standard Chemistry

• Boric Acid, LiOH, TSP, HCL, HNO3

– Multiple Materials• Submerged zinc granules determined from 371 lbs of paint chips• Vapor and submerged STP aluminum scaffolding (90%/10%)• Submerged Fiber glass – columns and tank (41%/59%)• Submerged concrete

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T2 LBLOCA Preliminary Results

• SEM– Membranes

– Scale

– Coupons

• ICP Analysis of Scale• XRD• XPS

• Temperature Profile• Approach Velocity• Differential Pressure• pH• Turbidity• Select metal

concentrations

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Temperature Profile

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Velocity

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Temperature Corrected Dp

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pH

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Turbidity

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Measured Aluminum

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Measured Calcium

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Measured Silicon

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Measured Zinc

CHLE Tank

CHLE Head Loss Columns

Debris beds in head loss columnsBlender bed vs. NEI bed

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Vapor Space Materials

Pre-test Post-test

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Submerged Materials

• Pre-test

Pre-test Post-test

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Inside the Mesh

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Submerged MaterialPre-test

Post-test

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Scale

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ICET Test 2

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Post-test Tank Solution

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SEM of Scale

Element Atomic %O 56.3P 18.6

Zn 25.1

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Digested Scale ICP-OES Results

Metal mg/Kg %Aluminum 180 0.04

Calcium 1000 0.21

Silicon 100 0.02

Zinc 480,000 99.73

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XRD of Scale

• Crystalline• Mixture

– Main phase – Zn3(PO4)2●4H2O (Hopeite)– Trace phase – CaAl2Si7O18 ● 6H2O (Heulandite)

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Scale on Submerged Al

• Preliminary SEM results – Similar to constituents of MBLOCA scale

• Aluminum and oxygen• Aluminum, phosphorous, and oxygen• Exception; trace amounts of zinc detected

– Possibly more scale

MBLOCA LBLOCA

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Awaiting….

• Post-test analysis of bed• XPS Results

– Another confirmation of scale constituents– Provides stoichiometric formula

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Post-test beds

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SEM

Element Element % Atomic %O 7.3 24.2Zn 92.7 75.8

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Zinc Material

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SEM

Element Atomic %O 73.7P 11.4

Ca 3.9Zn 10.9

Element Atomic %O 56.3P 18.6

Zn 25.1

ScaleCaptured Particle

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SEM

Element Atomic % O 88. 7 Al 7.1 Si 4.2

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SEM

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T2 Observations• Visible chemical product were detected • Measured aluminum concentrations are ~1/3 of that detected in T1• The filtered concentrations of zinc, aluminum and calcium maybe

lower than the total concentration• Membrane filters appears to capture more debris as compared to

T1• Turbidity has decreased to the lowest levels observed during the

testing series• NEI beds in C2 and C3 measure head loss due to solution

constituents • Chemical products may mainly be a zinc phosphate with trace

amounts of aluminum and/or calcium products

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Bench Top Experiments• Batch Corrosion test

– Three temperatures (85, 60, 35 oC)– Three solution pH values (6.0, 7.2, 7.7)– Two time frames (24 hours and 30 days)– Aluminum only, aluminum and silicon, zinc only

• Batch Dissolution/leaching test– Fiberglass dissolution in the presence of soluble aluminum

• Three temperatures, pH values and two time frames– Concrete leaching test for UNM and Southern concrete samples

• Path forward– Test plan will be re-visited after evaluation of current test result– More bench test for corrosion focused on zinc and aluminum materials– Another integrated tank test with blender bed

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NRC Call• Kerry to discuss UNM position • UNM’s position is supported by four test• Basis for Conclusion

– The release of corroded aluminum into solution is much less than predicted

– Precipitation in the bulk solution is not likely to have occurred– If precipitates were to form, they would be unlikely to cause a

significant increase in head loss• Conclusion

– Chemical precipitates are expected to have no effect on the ECCS strainers at the STP plant for all LOCAs smaller than a 6-inch break

• Likely valid for breaks up to 15 inches

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Questions?

Series 100: Leaching (concrete, debris)Series 200: Al corrosion T> 85 C

Lab Tests

Series 2000 -3000: Corrosion TestMax 30 day and initial release , variability

Series 4000: Precipitation testIdentification, characterization, variability

30 Day Tank Tests

Test 3: SBLOCA

Test 2: LBLOCA

Test 1 : Shake down

Test 4: MBLOCA

Short Term Tank Test

Test 1: Bed thickness to particulate Ratio 1

Test 2: Bed thickness to particulate Ratio 2

Test 2: Bed thickness to particulate Ratio 3

CASA

Thermodynamic Modeling

Precipitate calculator

Head Loss Calculator

Streamline CFD CalculationNE View

Slide 41

Velocity Magnitude and Unit Vector CFD Calculation

NE View

Slide 42