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Analysis of Safety Injection Fluid Mixing in the Downcomer and Cold Leg of Pressurized Water Reactors

  • Jason Chao
  • Bindi Chexal
  • Bill Layman
  • Robert McGriff
  • David Lunsford

Abstract

Four PWR designs were analyzed to obtain detailed three dimensional temperature and velocity distributions in the downcomers for the various pressurized thermal shock conditions.

In U.S. PWRs the SI lines connected to the cold legs provide an opportunity for the SI water to mix with the loop flow in the cold leg before it reaches the downcomer. In addition, warm fluids flowing through vent valves or other passages from the upper plenum are sources for heating the fluid in the downcomer. Providing a lower plenum in the plant model is recommended to simulate the local buoyancy flow pattern when the loop flow is near zero. In some foreign plants, two additional SI lines inject directly into the vesel. The cold water from SI forms a jet in the downcomer and is heated up rapidly by entrainment effects.

Keywords

Loop Flow Pressurize Water Reactor Safety Injection Degree Model Vent Valve 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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Copyright information

© Springer Science+Business Media New York 1984

Authors and Affiliations

  • Jason Chao
    • 1
  • Bindi Chexal
    • 1
  • Bill Layman
    • 1
  • Robert McGriff
    • 1
  • David Lunsford
    • 1
  1. 1.Nuclear Safety Analysis CenterElectric Power Research InstitutePalo AltoUSA

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