Determining subcriticality for EBR-II

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Description

The Experimental Breeder Reactor II (EBR-II) shut down on September 30, 1994 and defueling is under way. Longstanding safety rules for changing subassemblies in the EBR-II reactor grid include requirements on neutron count rates. A different safety strategy is needed for the defueling operations because the count rates will become too low as the Sb-Be neutron source decays and fuel removal reduces neutron multiplication. A key component of the new strategy is to establish a deeply subcritical configuration and then confirm the deep subcriticality. The calculational and experimental approaches used to verify that the reactor has been made deeply subcritical ... continued below

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7 p.

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Schaefer, R.W. June 1, 1995.

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  • Argonne National Laboratory
    Publisher Info: Argonne National Lab., Idaho Falls, ID (United States)
    Place of Publication: Idaho Falls, Idaho

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Description

The Experimental Breeder Reactor II (EBR-II) shut down on September 30, 1994 and defueling is under way. Longstanding safety rules for changing subassemblies in the EBR-II reactor grid include requirements on neutron count rates. A different safety strategy is needed for the defueling operations because the count rates will become too low as the Sb-Be neutron source decays and fuel removal reduces neutron multiplication. A key component of the new strategy is to establish a deeply subcritical configuration and then confirm the deep subcriticality. The calculational and experimental approaches used to verify that the reactor has been made deeply subcritical are described in this paper. All the approaches make use of a reference loading. Just before the final shutdown, the core was reloaded to have a small ({approx}25{cents}) excess reactivity and essentially the most compact geometry possible. Criticality and other measurements were made to characterize the loading in the last startup, Run 170B.

Physical Description

7 p.

Notes

INIS; OSTI as DE95013703

Source

  • Annual meeting of the American Nuclear Society (ANS), Philadelphia, PA (United States), 25-29 Jun 1995

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  • Other: DE95013703
  • Report No.: ANL/IFR/CP--85398
  • Report No.: CONF-950601--21
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 97160
  • Archival Resource Key: ark:/67531/metadc793434

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  • June 1, 1995

Added to The UNT Digital Library

  • Dec. 19, 2015, 7:14 p.m.

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  • Jan. 6, 2016, 4:52 p.m.

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Schaefer, R.W. Determining subcriticality for EBR-II, article, June 1, 1995; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc793434/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.