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Low Temperature FAC
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This is an introduction to Low-Temperature FAC based on EPRI Technical Report

This is an introduction to Low-Temperature FAC based on EPRI Technical Report

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Low Temperature FAC Presentation Transcript

  • 1. Flow-Accelerated Corrosion at Low Temperatures R. Doremus February 20, 2009
  • 2. Overview
    • Summary of EPRI TR-1015170
      • Definition of Low-Temperature FAC
      • Cause
      • Operating Experience
        • PWR
        • BWR
      • EPRI Findings
      • EPRI Recommendations
    • Impact on CSI Procedures
  • 3. Definition
    • Typically, Flow-Accelerated Corrosion (FAC) occurs between 200ºF and 450ºF.
    • Low-Temperature FAC is FAC occurring below 200ºF.
  • 4. Cause
    • “poor water chemistry”
    • NOT Low Temperature
    • Low oxygen content
      • < 20 ppb
    • Neutral water
      • pH ~ 7.0
  • 5. Operating Experience in PWRs
    • South Texas Project
    • Palo Verde
    • Surry
    • Vogtle
  • 6. South Texas Project
    • Wear in piping downstream of Condensate Polishers
    • Operating Temp. = 90-130ºF
    • Carbon Steel (A106 B)
    • pH @ 77ºF = 7.0
    • Dissolved O 2 ~ 5 ppb
    • Measured Avg. Max. Wear Rate ~ 11.9 mils/year
  • 7. Palo Verde
    • Wear in Resin Traps downstream of Condensate Polishers
    • Operating Temp = 135ºF
    • Carbon Steel (A106 B)
    • pH @ 77ºF = 7.0
    • Dissolved O 2 ~ 1-3 ppb
    • Measured Avg. Max. Wear Rate ~ 6.6 mils/year
  • 8. Surry
    • Wear downstream of Condensate Polishers
    • Operating Temp = 135ºF
    • Carbon Steel (A106 B/A234 WPB)
    • pH of slightly less than 7.0
    • Measured Avg. Max. Wear Rate ~ 10 mils/year
  • 9. Vogtle
    • Wear downstream of Steam Generator Blowdown Demineralizers
    • Operating Temp = 130ºF
    • Carbon Steel
    • pH = 7.0
    • Measured Avg. Max. Wear Rate ~ 4.6 mils/year
  • 10. Operating Experience in BWRs
    • Fukushima Daini
    • Nine Mile Point
  • 11. Fukushima Daini
    • Wear downstream of orifice in Control Rod Drive line.
    • Operating Temp. = 95ºF
    • Carbon Steel (JIS STPT38)
    • Dissolved O 2 < 10 ppb
    • Measured Avg. Max. Wear Rate ~ 8.1 mils/year
  • 12. Nine Mile Point
    • Wear in Reactor Building Closed Loop Cooling System (RBCLC)
    • Operating Temp. = 120ºF
    • Carbon Steel (A53 A,B / A234 WPA,B)
    • Avg. pH = 6.5
    • Dissolved O 2 ~ 0 ppb (“below measurable amounts”)
    • Worked in conjunction with other wear mechanisms (crevice, galvanic, and general corrosion)
  • 13. EPRI Findings
    • Susceptible areas in PWRs
      • Downstream of Condensate Polishers before amine injection point
      • Downstream of Steam Generator Blowdown Demineralizers
    • Susceptible areas in BWRs
      • Condensate upstream of oxygen injection point
      • Anywhere with oxygen content < 20 ppb
  • 14. EPRI Findings
    • According to EPRI, CHECWORKS SFA can be applied to BWRs, CANDUs, and PWRs effectively for Low-Temperature FAC.
  • 15. EPRI Recommendations
    • PWRs
      • Perform susceptibility analyses and, if necessary, inspections on Resin Traps and piping between polishers and amine injection points.
      • Perform susceptibility analyses and, if necessary, inspections on piping downstream of Steam Generator Blowdown Demineralizers.
  • 16. EPRI Recommendations
    • BWRs
      • Include all low-oxygen areas (< 20 ppb) of condensate, feedwater, and auxiliary systems in the FAC program.
      • Be aware of possible damage upstream of oxygen injection location. Analysis and inspection may be required.
  • 17. Impact on CSI Projects
    • PWRs
      • Piping downstream of Condensate Polishers and Steam Generator Blowdown Demineralizers should not be excluded in a System Susceptibility Evaluation (SSE) analysis due to low temperature.
      • These lines should be modeled, if possible.
      • Otherwise, include in the Susceptible Non-Modeled (SNM) Program.
      • Will need input from client on amine injection point if not obvious from P&IDs or isometrics.
  • 18. Impact on CSI Projects
    • BWRs
      • Use Water Chemistry Analysis in SFA to determine low-oxygen areas of the plant.
        • May require entering plant global data in CHECWORKS prior to completion of an SSE.
      • Be aware piping upstream of oxygen injection points.
      • Categorize all low-oxygen areas as susceptible, regardless of temperature.
      • Model susceptible lines if possible.
      • Otherwise, include in SNM.