The Effect of Birthrate Granularity on the Release- to- Birth Ratio for the AGR-1 In-core Experiment

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The AGR-1 Advanced Gas Reactor (AGR) tristructural-isotropic-particle fuel experiment underwent 13 irradiation intervals from December 2006 until November 2009 within the Idaho National Laboratory Advanced Test Reactor in support of the Next Generation Nuclear Power Plant program. During this multi-year experiment, release-to-birth rate ratios were computed at the end of each operating interval to provide information about fuel performance. Fission products released during irradiation were tracked daily by the Fission Product Monitoring System using 8-hour measurements. Birth rates calculated by MCNP with ORIGEN for as-run conditions were computed at the end of each irradiation interval. Each time step in MCNP ... continued below

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Scates, Dawn & Walter, John October 1, 2012.

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The AGR-1 Advanced Gas Reactor (AGR) tristructural-isotropic-particle fuel experiment underwent 13 irradiation intervals from December 2006 until November 2009 within the Idaho National Laboratory Advanced Test Reactor in support of the Next Generation Nuclear Power Plant program. During this multi-year experiment, release-to-birth rate ratios were computed at the end of each operating interval to provide information about fuel performance. Fission products released during irradiation were tracked daily by the Fission Product Monitoring System using 8-hour measurements. Birth rates calculated by MCNP with ORIGEN for as-run conditions were computed at the end of each irradiation interval. Each time step in MCNP provided neutron flux, reaction rates and AGR-1 compact composition, which were used to determine birth rates using ORIGEN. The initial birth-rate data, consisting of four values for each irradiation interval at the beginning, end, and two intermediate times, were interpolated to obtain values for each 8-hour activity. The problem with this method is that any daily changes in heat rates or perturbations, such as shim control movement or core/lobe power fluctuations, would not be reflected in the interpolated data and a true picture of the system would not be presented. At the conclusion of the AGR-1 experiment, great efforts were put forth to compute daily birthrates, which were reprocessed with the 8-hour release activity. The results of this study are presented in this paper.

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  • 6th International Topical Meeting on High Temperature Reactor Technology HTR2012,Miraikan, Tokyo, Japan,10/28/2012,11/01/2012

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  • Report No.: INL/CON-12-24469
  • Grant Number: DE-AC07-05ID14517
  • Office of Scientific & Technical Information Report Number: 1060959
  • Archival Resource Key: ark:/67531/metadc841076

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  • October 1, 2012

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  • May 19, 2016, 9:45 a.m.

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  • June 20, 2016, 1:53 p.m.

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Scates, Dawn & Walter, John. The Effect of Birthrate Granularity on the Release- to- Birth Ratio for the AGR-1 In-core Experiment, article, October 1, 2012; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc841076/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.