Reactor Xenon-135 Poisoning & Shutdown Deadtime Calculator
Compute equilibrium $^{135}\text{Xe}$ and $^{135}\text{I}$ concentrations, peak post-shutdown xenon reactivity poisoning (xenon pit), and reactor deadtime restart windows.
Pre-Shutdown Operating State
Typical commercial PWR ~3 - 5 × 10¹³
Available shutdown reactivity margin
2.6 million barns (massive absorber)
Post-Shutdown Transient & Peak Poisoning
Peak Xenon Reactivity Loss
-
-
Time to Peak Xenon (t_peak)
-
-
Equilibrium Xenon
--
Equilibrium Iodine
--
Reactor Deadtime
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Chernobyl Xenon Pit Safety Warning
Attempting to force a reactor critical during peak xenon deadtime by withdrawing all control rods caused the Chernobyl disaster.
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