Result of AGNES calculation for IRSN exercise

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Result of AGNES calculation for IRSN exercise

• Y. Yamane, K. Okubo and Y.Miyoshi
• JAEA

2
Modeling

• keff-equivalent cylinder was used to calculate
  kinetic parameters.
• The same kinetic behavior was expected.
• Volume-and-height-equivalent cylinder was used
  for AGNES calculation.
• The same reactivity feedback was expected for
  temperature change and void behavior.

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Kinetic Parameters

• Prompt neutron life time 3.2101?10-5(sec).
• Delayed neutron fraction, bi and decay constant
  of precursors, li.
• Reactivity coefficients

group i 1 2 3 4 5 6
bi 2.7591 ?10-4 1.8048 ?10-3 1.6240 ?10-3 3.2031 ?10-3 9.4077 ?10-4 3.4257 ?10-3
li (sec) 0.0124 0.0305 0.1114 0.3014 1.136 3.0139
order 1 2
temperature -2.947 (cent/ºC) -0.03014 (cent/ºC2)
void -44.43 (cent/void) -1.039 (cent/void2)
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Other conditions for base case

• Inserted reactivity 1.5
• Initial weight for FB reactivity 1.6
• Weight value decays as 10.6exp(-t/100) to 1
• Volume-eq. Cylinder
• Homogenious temperature distribution in fuel
• Adiabatic between container and outer air

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Power -5000s for r0 1-2
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Power -50s for r0 1-2
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Power -6s for r0 1-2
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Energy -5000s for r0 1-2
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Temperature -5000s for r0 1-2
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Temperature -50s for r0 1-2
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Temperature -6s for r0 1-2
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Power -5000s for ini. weight 14-1.8
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Power -50s for ini. weight 1.4-1.8
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Power 0.6s for ini. weight 1.4-1.8
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Energy -5000s for ini. weight 1.4-1.8
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Temperature -5000s for ini. weight 1.4-1.8
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Temperature -50s for ini. weight 1.4-1.8
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Temperature -6s for ini. weight 1.4-1.8
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Power -5000s for volume eq. v.s. keff eq.
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Power -50s for volume eq. v.s. keff eq.
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Power -5000s for volume eq. v.s. keff eq.
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Energy -5000s for volume eq. v.s. keff eq.
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Temperature -5000s for volume eq. v.s. keff eq.
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Result for reactivity 1-2
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Result for ini. weight 1-1.8
?6/0.1
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Result for Volume-eq. v.s. keff-eq. Conditions
-23
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Summary

• 1st guess (not estimation)
• Max. power lt 5 ?108 (w) 1.6 ?1019 (fis/s)
• Energy at 10min. lt1.5 ?107 (J) 4.7 ?1017
  (fis/s)
• Energy at 1hour lt1.5 ?107 (J)