Reactor Xenon Poisoning Iodine Pit Calculator
Nuclear reactor safety & operational physics: Model post-shutdown Xenon-135 peak buildup from Iodine-135 beta decay ("Iodine pit"), negative reactivity insertion ($\Delta\rho_{\text{Xe}}$ in pcm), and reactor deadtime.
Pre-Shutdown Operating Flux
Commercial PWR: 2–5 × 10¹³ n/cm²·s
>3 days establishes equilibrium
Post-Shutdown Time Elapsed
Xenon peak occurs between 8–11 hours
Control rod + chemical shim reserve
Xenon Poisoning & Reactivity Deficit
Xenon Reactivity Worth Δρ_Xe:
--
pcm negative poisoning penalty
Peak Xenon Time t_max:
--
hours after shutdown
Peak Maximum Xenon Deficit:
--
pcm at apex of Iodine pit
Steady-State Equilibrium Xenon:
--
pcm during normal operation
| Iodine-135 Relative Concentration: | -- |
| Xenon-135 Relative Concentration: | -- |
| Restart Capability Status: | -- |
| Reactor State: | -- |
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