1 / 42

October Team Meeting Overview: T2 LBLOCA Corrosion Results and Bench Experiments

On November 29, 2012, the team, led by Dr. Janet Leavitt, discussed preliminary results from T2 LBLOCA corrosion tests. Key objectives included evaluating aluminum corrosion and its impact on head loss, conducted under specified temperature and chemical conditions. Notable findings included SEM and ICP analysis of scale formed on submerged materials, revealing crystalline and trace phases. The discussion highlighted that aluminum corrosion release into solutions is lower than predicted, suggesting minimal impact on ECCS strainers for breaks under 15 inches. Further test plans focus on refining corrosion research.

zoltin
Télécharger la présentation

October Team Meeting Overview: T2 LBLOCA Corrosion Results and Bench Experiments

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CHLE Update STP October Team Lead Meeting 11/29/2012 Janet Leavitt, Ph.D.

  2. Overview • T2 LBLOCA Results • Bench Top Experiments • NRC Call

  3. Corrosion/precipitation scenario

  4. 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

  5. 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

  6. Temperature Profile

  7. Velocity

  8. Temperature Corrected Dp

  9. pH

  10. Turbidity

  11. Measured Aluminum

  12. Measured Calcium

  13. Measured Silicon

  14. Measured Zinc

  15. CHLE Tank

  16. CHLE Head Loss Columns

  17. Debris beds in head loss columnsBlender bed vs. NEI bed

  18. Vapor Space Materials Pre-test Post-test

  19. Submerged Materials • Pre-test Pre-test Post-test

  20. Inside the Mesh

  21. Submerged Material Pre-test Post-test

  22. Scale

  23. ICET Test 2

  24. Post-test Tank Solution

  25. SEM of Scale

  26. Digested Scale ICP-OES Results

  27. XRD of Scale • Crystalline • Mixture • Main phase – Zn3(PO4)2●4H2O (Hopeite) • Trace phase – CaAl2Si7O18 ● 6H2O (Heulandite)

  28. 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

  29. Awaiting…. • Post-test analysis of bed • XPS Results • Another confirmation of scale constituents • Provides stoichiometric formula

  30. Post-test beds

  31. SEM

  32. Zinc Material

  33. SEM Captured Particle Scale

  34. SEM

  35. SEM

  36. 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

  37. 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

  38. 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

  39. Questions?

  40. Lab Tests Short Term Tank Test 30 Day Tank Tests Series 100: Leaching (concrete, debris) Series 200: Al corrosion T> 85 C Series 2000 -3000: Corrosion Test Max 30 day and initial release , variability Series 4000: Precipitation test Identification, characterization, variability Test 1 : Shake down Test 2: LBLOCA Test 1: Bed thickness to particulate Ratio 1 Test 2: Bed thickness to particulate Ratio 3 Test 2: Bed thickness to particulate Ratio 2 Test 4: MBLOCA Test 3: SBLOCA Thermodynamic Modeling Head Loss Calculator Precipitate calculator CASA

  41. Streamline CFD CalculationNE View

  42. Velocity Magnitude and Unit Vector CFD Calculation NE View

More Related