Development of a standard for calculation and measurement of the moderator temperature coefficient of reactivity in water-moderated power reactors

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The moderator temperature coefficient of reactivity (MTC) is an important parameter in safety analyses for thermal reactors. A positive MTC can exacerbate the severity of heatup transients, while a negative MTC can worsen the severity of cooldown transients. In particular, a strongly negative MTC is the major determinate of the severity of the steamline-break accident for pressurized water reactors (PWRs). Conversely, positive and negative MTCs can mitigate the severity of cooldown and heatup transients, respectively. Consequently, the accurate measurement and prediction of MTCs is an important factor in demonstrating that power reactors can be operated safely. ANS 19.11, the standard ... continued below

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6 p.

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Mosteller, R.D.; Apperson, C.E. Jr.; Gavin, P.H.; Hall, R.A.; Lancaster, D.B.; Robertson, S.T. et al. December 31, 1997.

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The moderator temperature coefficient of reactivity (MTC) is an important parameter in safety analyses for thermal reactors. A positive MTC can exacerbate the severity of heatup transients, while a negative MTC can worsen the severity of cooldown transients. In particular, a strongly negative MTC is the major determinate of the severity of the steamline-break accident for pressurized water reactors (PWRs). Conversely, positive and negative MTCs can mitigate the severity of cooldown and heatup transients, respectively. Consequently, the accurate measurement and prediction of MTCs is an important factor in demonstrating that power reactors can be operated safely. ANS 19.11, the standard for ``Calculation and Measurement of the Moderator Temperature Coefficient of Reactivity in Water-Moderated Power Reactors,`` recently has been approved as a national standard by the American National Standards institute (ANSI) and the American Nuclear Society (ANS). At present, the scope of the standard is limited to PWRs, because that is the only type of power reactor currently sited in the US for which measurement of the MTC is required. The standard addresses the calculation and measurement of the MTC, and it also addresses the calculation of the ITC.

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6 p.

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INIS; OSTI as DE98007151

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  • International conference on the physics of nuclear science and technology, Long Island, NY (United States), 5-8 Oct 1998

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  • Other: DE98007151
  • Report No.: LA-UR--97-5078
  • Report No.: CONF-981003--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 674736
  • Archival Resource Key: ark:/67531/metadc710124

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  • December 31, 1997

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  • Sept. 12, 2015, 6:31 a.m.

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  • Feb. 25, 2016, 3:54 p.m.

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Mosteller, R.D.; Apperson, C.E. Jr.; Gavin, P.H.; Hall, R.A.; Lancaster, D.B.; Robertson, S.T. et al. Development of a standard for calculation and measurement of the moderator temperature coefficient of reactivity in water-moderated power reactors, article, December 31, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc710124/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.