MODERATOR TEMPERATURE COEFFICIENTS IN HEAVY WATER REACTORS

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Reactors that are moderated with heavy water differ from those that are moderated with graphite in that (1) the moderator temperature is lower than it may be in graphite reactors, (2) when the moderator temperature is raised, the moderator-to-fuel ratio decreases, and (3) circulation in the moderator introduces local, random changes in reactivity that distort the flux distribution. The large negative contributions to the moderator temperature coefficient from leakage and resonance capture overshadow any positive contribution from eta that may accompany the buildup of plutonium with exposure. The effect of the coefficient on reactor safety depends upon the manner in ... continued below

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St. John, D.S. December 1, 1959.

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Description

Reactors that are moderated with heavy water differ from those that are moderated with graphite in that (1) the moderator temperature is lower than it may be in graphite reactors, (2) when the moderator temperature is raised, the moderator-to-fuel ratio decreases, and (3) circulation in the moderator introduces local, random changes in reactivity that distort the flux distribution. The large negative contributions to the moderator temperature coefficient from leakage and resonance capture overshadow any positive contribution from eta that may accompany the buildup of plutonium with exposure. The effect of the coefficient on reactor safety depends upon the manner in which the D/sub 2/O circulation couples the reactor power to the moderator temperature. (auth)

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  • Other Information: Orig. Receipt Date: 31-DEC-60

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  • Report No.: DP-452
  • Grant Number: AT(07-2)-1
  • DOI: 10.2172/4186804 | External Link
  • Office of Scientific & Technical Information Report Number: 4186804
  • Archival Resource Key: ark:/67531/metadc880160

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  • December 1, 1959

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Oct. 27, 2017, 1:49 p.m.

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St. John, D.S. MODERATOR TEMPERATURE COEFFICIENTS IN HEAVY WATER REACTORS, report, December 1, 1959; United States. (digital.library.unt.edu/ark:/67531/metadc880160/: accessed June 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.