Xenon

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Author:
ashleykovacs
ID:
169846
Filename:
Xenon
Updated:
2012-09-09 16:10:09
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Xenon
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Description:
Xenon
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  1. What are Xenon Thumbrules
    HFP Eq XE 

    • BOL ~ 2500
    • MOL ~ 3000
    • EOL ~ 3000

    HFP Xe worth 8 hours after trip

    • BOL ~ 4200
    • MOL ~ 5000
    • EOL ~ 5200

    • Xe to reach equil after trip: 80 hours
    • Xe to reach equil after startup: 42 hours


    • Peaks after a trip/down power = sq root (delta power)
    • Peaks after a load increase = cubed root (delta power)
  2. How is Xenon produced?
    • Xenon produced by :
    • 1)       From fission 
    • 2)       From decay of Iodine




    • gamma_Xe =     Fission yield of Xe-135 = 0.002 or 0.2%.
    • Sigmaf =      Macroscopic fission cross section for U-235. 
    • Phi =        Thermal neutron flux.
    • LambdaI =       Decay constant for I-135 = 2.92 x 10-5 sec-1.
    • NI =     I-135 concentration.
  3. How is Xenon Removed?
    • Xenon removed by :
    • 1)       beta decay to Cesium-135
    • 2)       burned out by absorbing a neutron



    • lambdaXe=Decay constant for Xe-135 = 2.12 x 10-5 sec-1.
    • NXe = Xe-135 concentration.
    • sigma= Xe-135 microscopic absorption cross section. 
    • phi =thermal neutron flux.
  4. Xenon thumbrules for different times in life?
     

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