SUMMARY OF HRT RUNS 22, 23 AND 24

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In runs 22, 23, and 24 the HRT was operated with downward flow through the core at powers up to 5 Mw. Because of leakage past the lower core tank patch, uranium could not be prevented from entering tbe blanket, so the concentration was deliberately kept above 1 g U/kg D/sub 2/O. The core power was about 0.6 of the total. Nuclear power fluctuations were larger than with upward core flow, and the cause was investigated intensively in run 22 at powers up to 1.8 Mw. Run 22 was terminated after 778 hours when a leak developed in a fuel ... continued below

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Pages: 92

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Bauman, H.F.; Buchanan, J.R.; Engel, J.R.; Haubenreich, P.N. & Richardson, D.M. March 1, 1962.

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In runs 22, 23, and 24 the HRT was operated with downward flow through the core at powers up to 5 Mw. Because of leakage past the lower core tank patch, uranium could not be prevented from entering tbe blanket, so the concentration was deliberately kept above 1 g U/kg D/sub 2/O. The core power was about 0.6 of the total. Nuclear power fluctuations were larger than with upward core flow, and the cause was investigated intensively in run 22 at powers up to 1.8 Mw. Run 22 was terminated after 778 hours when a leak developed in a fuel feed pump weld. In run 23 the power was ratsed stepwise to 5 Mw. This run was terminated after 794 hours by the removal of the fuel, containing the fission and corrosion products accumulated in 10,028 hours of operation. Fuel replacement required three days. Run 24 operations were hampered by a leak which developed between the feed and letdown streams in the fuel letdown heat exchanger. The run was terminated after 546 hours, when a crack developed in a fuel feed line tee and leaked solution into the reactor cell. The changes in the core flow and heat transfer were evidently effectiw'e in eliminatingregions of high temperatures and uranium deposition. ln all the operations, including more than 100 hours at 5 Mw, there was never any indication of fuel instability. Previous operation at the same pressure (1400 psig) and core mean temperature had resulted in detectable instability at lower powers. (auth)

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Pages: 92

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  • Other Information: Orig. Receipt Date: 31-DEC-62

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  • Report No.: ORNL-TM-106
  • Grant Number: W-7405-ENG-26
  • DOI: 10.2172/4808872 | External Link
  • Office of Scientific & Technical Information Report Number: 4808872
  • Archival Resource Key: ark:/67531/metadc1060556

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  • March 1, 1962

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  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 1, 2018, 3:24 p.m.

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Bauman, H.F.; Buchanan, J.R.; Engel, J.R.; Haubenreich, P.N. & Richardson, D.M. SUMMARY OF HRT RUNS 22, 23 AND 24, report, March 1, 1962; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1060556/: accessed November 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.