Effects of Xenon Poison
•Saturating fission products are fission products whose concentration in fuel operating in a steady flux (i.e., at steady power):depends on the flux level, and comes to an asymptotic, finite limit even as the value of the steady flux is assumed to increase to infinity.
•The most important saturating fission product is 135Xe, but other examples are 103Rh, 149Sm and 151Sm. In each case the nuclide is a direct fission product, but is also produced by the β-decay of another fission product.
135Xe and 135I
•135Xe is produced directly in fission, but mostly from the beta decay of its precursor 135I (half-life 6.585 hours).
•It is destroyed in two ways: By its own radioactive decay (half-life 9.169 hours), and By neutron absorption to 136Xe.
•See Figure “135Xe/135I Kinetics” in next slide.
- TEPCO’s latest findings of Cu lead to questions about status of RPV and location of melted fuel (enformable.com)
- NISA Confirms Gas In Reactor 2 is Xenon-133 and Xenon-135 – “High potential for spontaneous fission” (enformable.com)
- Fission may have reached criticality – a state of self-sustaining nuclear fission (enformable.com)
- Kyoto Nuke Expert: This amount of xenon would not be detected unless melted fuel had “fission chain reaction” – Xe-133, -135 usually not present, even during operation of reactors (enenews.com)
- ALERT: “Fission restarted” at Fukushima Reactor No. 2 – Jiji reports detection of Xenon-135 – TEPCO now injecting boric acid (enenews.com)
- Japan Times: It is now a “grave situation” at Fukushima – “Plutonium fission” mentioned for first time – “Criticality is very likely to have occurred” (enenews.com)
- NISA releases Japanese nuclear stress test reviews on website (enformable.com)
- Post-Fukushima, Japanese Official sees crisis as war between humans and technology (enformable.com)
- NYTimes: For first time Tepco admits “fuel deep inside 3 stricken plants probably CONTINUING to experience bursts of fission” – Fission at Reactors 1 and 3 also? (enenews.com)
- March 14th, 2011 – Status of Fukushima Daiichi and Daini with Supplementary Materials (enformable.com)
- Japan Orders TEPCO to Revise Road Map (enformable.com)
- What is the future of nuclear power in Japan? Area residents reject Nuclear Power (enformable.com)