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	<title>Comments on: Nuclear Fission for Dummies: Xenon-135</title>
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	<link>http://nuclearfissionary.com/2010/05/06/nuclear-fission-for-dummies-xenon-135/?utm_source=rss&#038;utm_medium=rss&#038;utm_campaign=nuclear-fission-for-dummies-xenon-135</link>
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		<title>By: The Standard Model and Quantum Gravity: Identifying and Correcting Errors &#171; Quantum field theory</title>
		<link>http://nuclearfissionary.com/2010/05/06/nuclear-fission-for-dummies-xenon-135/#comment-995</link>
		<dc:creator>The Standard Model and Quantum Gravity: Identifying and Correcting Errors &#171; Quantum field theory</dc:creator>
		<pubDate>Sat, 15 Jan 2011 22:44:28 +0000</pubDate>
		<guid isPermaLink="false">http://nuclearfissionary.com/?p=102#comment-995</guid>
		<description>[...] on the 200 fission products had been incomplete, and it turned out that some fission products like Xe-135 had large cross-sections to absorb neutrons, so after a few hours enough had been produced to [...]</description>
		<content:encoded><![CDATA[<p>[...] on the 200 fission products had been incomplete, and it turned out that some fission products like Xe-135 had large cross-sections to absorb neutrons, so after a few hours enough had been produced to [...]</p>
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		<title>By: Mathew King</title>
		<link>http://nuclearfissionary.com/2010/05/06/nuclear-fission-for-dummies-xenon-135/#comment-730</link>
		<dc:creator>Mathew King</dc:creator>
		<pubDate>Fri, 24 Sep 2010 01:16:33 +0000</pubDate>
		<guid isPermaLink="false">http://nuclearfissionary.com/?p=102#comment-730</guid>
		<description>This is, in fact, exactly how research reactors operate. The excess reactivity is limited by the NRC to about $8.00, but this is quite significant and will overcome any Xenon build up. I work at a reactor and when we start up from a clean (xenon free) core, we have to pull blades for about 16 hours until xenon equilibrates. If we shutdown and then start back up before the xenon decays away (~60 hours) we actually have to insert rods into the core because power creeps up. The rate of xenon buildup is very slow, so this is not a sudden thing, we are talking &lt;1% power over 1 hour.</description>
		<content:encoded><![CDATA[<p>This is, in fact, exactly how research reactors operate. The excess reactivity is limited by the NRC to about $8.00, but this is quite significant and will overcome any Xenon build up. I work at a reactor and when we start up from a clean (xenon free) core, we have to pull blades for about 16 hours until xenon equilibrates. If we shutdown and then start back up before the xenon decays away (~60 hours) we actually have to insert rods into the core because power creeps up. The rate of xenon buildup is very slow, so this is not a sudden thing, we are talking &lt;1% power over 1 hour.</p>
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		<title>By: Reese</title>
		<link>http://nuclearfissionary.com/2010/05/06/nuclear-fission-for-dummies-xenon-135/#comment-501</link>
		<dc:creator>Reese</dc:creator>
		<pubDate>Thu, 13 May 2010 01:40:31 +0000</pubDate>
		<guid isPermaLink="false">http://nuclearfissionary.com/?p=102#comment-501</guid>
		<description>@Charles Barton:

I just love your attitude about the U-233!  Someday it WILL happen.  

@Rod Adams:

Yes, ca. 1985, one of the dual D2G machines (USS California) liked to go from &quot;modlock&quot; 15% or so power to 100%.   In just a few minutes.  And then back to 15%.  These were &quot;drills,&quot; i.e. just so we could show we could do it-- you know, practice.  The core was 13 years old or so.  (Don&#039;t remember the EFPHs, but it didn&#039;t wear out &#039;til &#039;92).  Yeah, the reactor operator had to &quot;shim&quot; a little in and out for a few hours after, but hey, that was his job if the Captain wanted to water-ski behind a rooster tail for a few minutes.</description>
		<content:encoded><![CDATA[<p>@Charles Barton:</p>
<p>I just love your attitude about the U-233!  Someday it WILL happen.  </p>
<p>@Rod Adams:</p>
<p>Yes, ca. 1985, one of the dual D2G machines (USS California) liked to go from &#8220;modlock&#8221; 15% or so power to 100%.   In just a few minutes.  And then back to 15%.  These were &#8220;drills,&#8221; i.e. just so we could show we could do it&#8211; you know, practice.  The core was 13 years old or so.  (Don&#8217;t remember the EFPHs, but it didn&#8217;t wear out &#8217;til &#8217;92).  Yeah, the reactor operator had to &#8220;shim&#8221; a little in and out for a few hours after, but hey, that was his job if the Captain wanted to water-ski behind a rooster tail for a few minutes.</p>
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		<title>By: Charles Barton</title>
		<link>http://nuclearfissionary.com/2010/05/06/nuclear-fission-for-dummies-xenon-135/#comment-482</link>
		<dc:creator>Charles Barton</dc:creator>
		<pubDate>Sun, 09 May 2010 20:49:57 +0000</pubDate>
		<guid isPermaLink="false">http://nuclearfissionary.com/?p=102#comment-482</guid>
		<description>As Eugene Wigner once pointed out to Enrico Fermi, if you continuously remove  Xenon-135, you can breed in a high power density thermal neutron reactor.   How can you do that, Fermi asked.  

Dissolve the uranium  in a carrier fluid, run the fluid into a core with a large enough volume to achieve a critical mass, and then bubble the Xenon-135 out of the reactor, Wigner replied.

But U-235 will not give enough neutrons to breed in a thermal reactor, Fermi said.

Yes but U-233 will, Wigner answered</description>
		<content:encoded><![CDATA[<p>As Eugene Wigner once pointed out to Enrico Fermi, if you continuously remove  Xenon-135, you can breed in a high power density thermal neutron reactor.   How can you do that, Fermi asked.  </p>
<p>Dissolve the uranium  in a carrier fluid, run the fluid into a core with a large enough volume to achieve a critical mass, and then bubble the Xenon-135 out of the reactor, Wigner replied.</p>
<p>But U-235 will not give enough neutrons to breed in a thermal reactor, Fermi said.</p>
<p>Yes but U-233 will, Wigner answered</p>
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		<title>By: Rod Adams</title>
		<link>http://nuclearfissionary.com/2010/05/06/nuclear-fission-for-dummies-xenon-135/#comment-480</link>
		<dc:creator>Rod Adams</dc:creator>
		<pubDate>Sun, 09 May 2010 07:51:19 +0000</pubDate>
		<guid isPermaLink="false">http://nuclearfissionary.com/?p=102#comment-480</guid>
		<description>One way to make Xe a non issue is to provide a sufficient Xe override capability with a bit of excess reactivity and control rods. It may not be the most efficient or technically elegant way to solve the problem, but it works fine and lasts a long time, 33 years in some particular systems that I know reasonably well.</description>
		<content:encoded><![CDATA[<p>One way to make Xe a non issue is to provide a sufficient Xe override capability with a bit of excess reactivity and control rods. It may not be the most efficient or technically elegant way to solve the problem, but it works fine and lasts a long time, 33 years in some particular systems that I know reasonably well.</p>
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		<title>By: Jack Gamble</title>
		<link>http://nuclearfissionary.com/2010/05/06/nuclear-fission-for-dummies-xenon-135/#comment-474</link>
		<dc:creator>Jack Gamble</dc:creator>
		<pubDate>Fri, 07 May 2010 22:42:27 +0000</pubDate>
		<guid isPermaLink="false">http://nuclearfissionary.com/?p=102#comment-474</guid>
		<description>They&#039;re welcome to take me out of context, it&#039;s what they do and there&#039;s really no avoiding it.  Luckily reasonably intelligent as well as moderately stupid people see through it.</description>
		<content:encoded><![CDATA[<p>They&#8217;re welcome to take me out of context, it&#8217;s what they do and there&#8217;s really no avoiding it.  Luckily reasonably intelligent as well as moderately stupid people see through it.</p>
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		<title>By: Jack Gamble</title>
		<link>http://nuclearfissionary.com/2010/05/06/nuclear-fission-for-dummies-xenon-135/#comment-473</link>
		<dc:creator>Jack Gamble</dc:creator>
		<pubDate>Fri, 07 May 2010 22:39:21 +0000</pubDate>
		<guid isPermaLink="false">http://nuclearfissionary.com/?p=102#comment-473</guid>
		<description>The idea of Iodine from Chernobyl causing a cancer problem in France is untrue.  &#039;They&#039; conjure up this garbage everywhere a nuclear plant is found because &#039;they&#039; have nothing  real to use against us.

For many thyroid conditions, Doctors prescribe massive doses of radioiodine as treatment, as much as 30 millicuries, or as Helen Caldicott would say &quot;30 Million Picocuries!!!!&quot;

This dose is MEANT to be INGESTED, not an accidental breath of a few thousand picocuries mind you, we&#039;re talking millions of them ingested!  This is what Doctors tell you to take.  Nuclear plant employees receiving this treatment can&#039;t go in to work because they would set off the radiation monitors from 300 feet away in the parking lot! 

So I would seriously like to read the data they&#039;re using for this &#039;study&#039;...I could use a good laugh.</description>
		<content:encoded><![CDATA[<p>The idea of Iodine from Chernobyl causing a cancer problem in France is untrue.  &#8216;They&#8217; conjure up this garbage everywhere a nuclear plant is found because &#8216;they&#8217; have nothing  real to use against us.</p>
<p>For many thyroid conditions, Doctors prescribe massive doses of radioiodine as treatment, as much as 30 millicuries, or as Helen Caldicott would say &#8220;30 Million Picocuries!!!!&#8221;</p>
<p>This dose is MEANT to be INGESTED, not an accidental breath of a few thousand picocuries mind you, we&#8217;re talking millions of them ingested!  This is what Doctors tell you to take.  Nuclear plant employees receiving this treatment can&#8217;t go in to work because they would set off the radiation monitors from 300 feet away in the parking lot! </p>
<p>So I would seriously like to read the data they&#8217;re using for this &#8216;study&#8217;&#8230;I could use a good laugh.</p>
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		<title>By: Pete</title>
		<link>http://nuclearfissionary.com/2010/05/06/nuclear-fission-for-dummies-xenon-135/#comment-472</link>
		<dc:creator>Pete</dc:creator>
		<pubDate>Fri, 07 May 2010 22:14:17 +0000</pubDate>
		<guid isPermaLink="false">http://nuclearfissionary.com/?p=102#comment-472</guid>
		<description>Meredith- I am also skeptical of radioactive Iodine currently being a problem in France from the Chernobyl disaster.  However,  there are several different isotopes of Iodine, and many of them can be produced from nuclear fission. I-129, for instance, has a half-life of 15.7 million years.
http://en.wikipedia.org/wiki/Isotopes_of_iodine</description>
		<content:encoded><![CDATA[<p>Meredith- I am also skeptical of radioactive Iodine currently being a problem in France from the Chernobyl disaster.  However,  there are several different isotopes of Iodine, and many of them can be produced from nuclear fission. I-129, for instance, has a half-life of 15.7 million years.<br />
<a href="http://en.wikipedia.org/wiki/Isotopes_of_iodine" rel="nofollow">http://en.wikipedia.org/wiki/Isotopes_of_iodine</a></p>
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		<title>By: Meredith Angwin</title>
		<link>http://nuclearfissionary.com/2010/05/06/nuclear-fission-for-dummies-xenon-135/#comment-469</link>
		<dc:creator>Meredith Angwin</dc:creator>
		<pubDate>Fri, 07 May 2010 06:16:08 +0000</pubDate>
		<guid isPermaLink="false">http://nuclearfissionary.com/?p=102#comment-469</guid>
		<description>This was a very helpful post.  Thank you.  

One thing I was thinking about was the entire iodine issue.  If you follow my posts on another list, you may have noticed me dealing with a man who believes people are getting sick in France, RIGHT NOW, from the iodine from Chernobyl.  Yet iodine&#039;s half-life is so short that by the time the &quot;cloud&quot; got to France, there couldn&#039;t have been much left. I suppose I could have read this information in all sorts of publications, but seeing the short half-life of iodine as a problem for reactor operators was illuminating.</description>
		<content:encoded><![CDATA[<p>This was a very helpful post.  Thank you.  </p>
<p>One thing I was thinking about was the entire iodine issue.  If you follow my posts on another list, you may have noticed me dealing with a man who believes people are getting sick in France, RIGHT NOW, from the iodine from Chernobyl.  Yet iodine&#8217;s half-life is so short that by the time the &#8220;cloud&#8221; got to France, there couldn&#8217;t have been much left. I suppose I could have read this information in all sorts of publications, but seeing the short half-life of iodine as a problem for reactor operators was illuminating.</p>
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		<title>By: Luke Weston</title>
		<link>http://nuclearfissionary.com/2010/05/06/nuclear-fission-for-dummies-xenon-135/#comment-468</link>
		<dc:creator>Luke Weston</dc:creator>
		<pubDate>Fri, 07 May 2010 05:54:57 +0000</pubDate>
		<guid isPermaLink="false">http://nuclearfissionary.com/?p=102#comment-468</guid>
		<description>I try and use a term like &quot;neutronic poisons&quot; instead of just &quot;poisons&quot; to avoid that kind of potential quotemining :)</description>
		<content:encoded><![CDATA[<p>I try and use a term like &#8220;neutronic poisons&#8221; instead of just &#8220;poisons&#8221; to avoid that kind of potential quotemining <img src='http://nuclearfissionary.com/wp-includes/images/smilies/icon_smile.gif' alt=':)' class='wp-smiley' /> </p>
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