The equivalent fundamental-mode source

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In 1960, Hansen analyzed the problem of assembling fissionable material in the presence of a weak neutron source. Using point kinetics, he defined the weak source condition and analyzed the consequences of delayed initiation during ramp reactivity additions. Although not clearly stated in Hansen`s work, the neutron source strength that appears in the weak source condition corresponds to the equivalent fundamental-mode source. In this work, we describe the concept of an equivalent fundamental-mode source and we derive a deterministic expression for a factor, g*, that converts any arbitrary source distribution to an equivalent fundamental-mode source. We also demonstrate a simplified ... continued below

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35 p.

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Spriggs, G.D.; Busch, R.D.; Sakurai, Takeshi & Okajima, Shigeaki February 1, 1997.

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Description

In 1960, Hansen analyzed the problem of assembling fissionable material in the presence of a weak neutron source. Using point kinetics, he defined the weak source condition and analyzed the consequences of delayed initiation during ramp reactivity additions. Although not clearly stated in Hansen`s work, the neutron source strength that appears in the weak source condition corresponds to the equivalent fundamental-mode source. In this work, we describe the concept of an equivalent fundamental-mode source and we derive a deterministic expression for a factor, g*, that converts any arbitrary source distribution to an equivalent fundamental-mode source. We also demonstrate a simplified method for calculating g* in subcritical systems. And finally, we present a new experimental method that can be employed to measure the equivalent fundamental-mode source strength in a multiplying assembly. We demonstrate the method on the zero-power, XIX-1 assembly at the Fast Critical Assembly (FCA) Facility, Japan Atomic Energy Research Institute (JAERI).

Physical Description

35 p.

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INIS; OSTI as DE97005284

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  • Other Information: PBD: Feb 1997

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  • Other: DE97005284
  • Report No.: LA--13253
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/464158 | External Link
  • Office of Scientific & Technical Information Report Number: 464158
  • Archival Resource Key: ark:/67531/metadc680206

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • February 1, 1997

Added to The UNT Digital Library

  • July 25, 2015, 2:21 a.m.

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  • Feb. 25, 2016, 4:22 p.m.

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Spriggs, G.D.; Busch, R.D.; Sakurai, Takeshi & Okajima, Shigeaki. The equivalent fundamental-mode source, report, February 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc680206/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.