Rossi-{alpha} measurements in the fast critical assembly XIX-2

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A Rossi-{alpha} experiment was performed on the zero-power, XIX-2 assembly at the Fast Critical Assembly (FCA) facility operated by the Japan Atomic Energy Research Institute (JAERI), Tokai-mura, Japan. The XIX-2 assembly is a plutonium/natural uranium system comprised of plutonium/natural uranium core surrounded by a depleted uranium dioxide blanket (referred to as the soft blanket). The soft blanket is surrounded by an outer blanket comprised of depleted uranium dioxide blanket (referred to as the depleted blanket). Because the neutron lifetime in the soft and depleted blankets are significantly larger than the neutron lifetime in the core region, multiple decay modes were ... continued below

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25 p.

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Spriggs, G.D.; Sakurai, Takeshi & Okajima, Shigeaki May 21, 1997.

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A Rossi-{alpha} experiment was performed on the zero-power, XIX-2 assembly at the Fast Critical Assembly (FCA) facility operated by the Japan Atomic Energy Research Institute (JAERI), Tokai-mura, Japan. The XIX-2 assembly is a plutonium/natural uranium system comprised of plutonium/natural uranium core surrounded by a depleted uranium dioxide blanket (referred to as the soft blanket). The soft blanket is surrounded by an outer blanket comprised of depleted uranium dioxide blanket (referred to as the depleted blanket). Because the neutron lifetime in the soft and depleted blankets are significantly larger than the neutron lifetime in the core region, multiple decay modes were observed during this experiment. The first decay mode was measured with reasonable accuracy; however, because of the high intrinsic source strength produced by the large amounts of Pu-240 contained in the core region, the intrinsic source background was reached very rapidly, thus precluding the second decay mode from being resolved well enough to estimate the average system lifetime. Nevertheless, using the first decay mode (i.e., the rapid die-away time constant), the alpha at delayed critical for this root was measured to be 13,100 +/- 134 s{sup -1}. This root is associated with the prompt neutron lifetime of the core region. Using the calculated {beta}{sub eff} of 0.0036, the core lifetime is estimated to be 275 +/- 3% ns at delayed critical. 16 figs., 2 tabs.

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25 p.

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INIS; OSTI as DE97008150

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  • JAERI, Toykaimuria (Japan), 13-17 May 1997

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  • Other: DE97008150
  • Report No.: LA-UR--97-1915
  • Report No.: CONF-9705153--1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 522721
  • Archival Resource Key: ark:/67531/metadc691465

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  • May 21, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • March 1, 2016, 6:31 p.m.

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Spriggs, G.D.; Sakurai, Takeshi & Okajima, Shigeaki. Rossi-{alpha} measurements in the fast critical assembly XIX-2, article, May 21, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc691465/: accessed June 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.