POWER CALIBRATION FOR BSR LOADING 33

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BSR Loading 33 consists of an essentially 5 by 6 fuel element array completely reflected by water. It was controlled by means of two boron carbide shim-safety rods and a type 347 stainless steel regulating rod with an 57-mil wall, located as shown in Fig. a. The critical mass was about 3.4 kg of U/sup 235/ , with an excess reactivity for the clean cold loading of about 0.6%. The total mass in the initial loading was 3.6 kg of U/sup 235/. Loading 33 was initially assembled in November 1954, from clean cold fuel elements. The power calibration was made ... continued below

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Pages: 15

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Johnson, E.B. November 28, 1957.

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Description

BSR Loading 33 consists of an essentially 5 by 6 fuel element array completely reflected by water. It was controlled by means of two boron carbide shim-safety rods and a type 347 stainless steel regulating rod with an 57-mil wall, located as shown in Fig. a. The critical mass was about 3.4 kg of U/sup 235/ , with an excess reactivity for the clean cold loading of about 0.6%. The total mass in the initial loading was 3.6 kg of U/sup 235/. Loading 33 was initially assembled in November 1954, from clean cold fuel elements. The power calibration was made during the first series of runs at power levels appreciably above 1 watt. Cobalt foils were used as the detector material for the thermal neutron flux determination in the lattice. The foils were exposed at 6-in. intervals in vertical traverses in the water passage between the last two plates on the outside of the fuel elements. Measurements were also mnde along the vertical axis of the element in lattice position 25, which was approximately at the center of the configuration. Cadmium ratios were determined at centerline and at 6in. intervals below centerline. Symmetrical flux distribution was assumed around the north-south centerline of the core and cadmium ratios were assumed to be symmetrical around the reactor horizontal centerline. The treatment of the data has been described in detail in ORNL-1027 and ORNL-1682. (auth)

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Pages: 15

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  • Other Information: Orig. Receipt Date: 31-DEC-58

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  • Report No.: CF-57-11-30
  • Grant Number: W-7405-ENG-26
  • DOI: 10.2172/4327816 | External Link
  • Office of Scientific & Technical Information Report Number: 4327816
  • Archival Resource Key: ark:/67531/metadc1019129

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

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Creation Date

  • November 28, 1957

Added to The UNT Digital Library

  • Oct. 15, 2017, 10:09 p.m.

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  • Oct. 23, 2017, 1:51 p.m.

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Johnson, E.B. POWER CALIBRATION FOR BSR LOADING 33, report, November 28, 1957; Oak Ridge, Tennessee. (digital.library.unt.edu/ark:/67531/metadc1019129/: accessed December 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.