Accident Analysis for the NIST Research Reactor Before and After Fuel Conversion

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Postulated accidents have been analyzed for the 20 MW D2O-moderated research reactor (NBSR) at the National Institute of Standards and Technology (NIST). The analysis has been carried out for the present core, which contains high enriched uranium (HEU) fuel and for a proposed equilibrium core with low enriched uranium (LEU) fuel. The analyses employ state-of-the-art calculational methods. Three-dimensional Monte Carlo neutron transport calculations were performed with the MCNPX code to determine homogenized fuel compositions in the lower and upper halves of each fuel element and to determine the resulting neutronic properties of the core. The accident analysis employed a model ... continued below

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J., Baek; D., Diamond; Cuadra, A.; Hanson, A.L.; Cheng, L-Y. & Brown, N.R. September 30, 2012.

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Postulated accidents have been analyzed for the 20 MW D2O-moderated research reactor (NBSR) at the National Institute of Standards and Technology (NIST). The analysis has been carried out for the present core, which contains high enriched uranium (HEU) fuel and for a proposed equilibrium core with low enriched uranium (LEU) fuel. The analyses employ state-of-the-art calculational methods. Three-dimensional Monte Carlo neutron transport calculations were performed with the MCNPX code to determine homogenized fuel compositions in the lower and upper halves of each fuel element and to determine the resulting neutronic properties of the core. The accident analysis employed a model of the primary loop with the RELAP5 code. The model includes the primary pumps, shutdown pumps outlet valves, heat exchanger, fuel elements, and flow channels for both the six inner and twenty-four outer fuel elements. Evaluations were performed for the following accidents: (1) control rod withdrawal startup accident, (2) maximum reactivity insertion accident, (3) loss-of-flow accident resulting from loss of electrical power with an assumption of failure of shutdown cooling pumps, (4) loss-of-flow accident resulting from a primary pump seizure, and (5) loss-of-flow accident resulting from inadvertent throttling of a flow control valve. In addition, natural circulation cooling at low power operation was analyzed. The analysis shows that the conversion will not lead to significant changes in the safety analysis and the calculated minimum critical heat flux ratio and maximum clad temperature assure that there is adequate margin to fuel failure.

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  • Report No.: BNL--98524-2012-IR
  • Grant Number: DE-AC02-98CH10886
  • DOI: 10.2172/1056436 | External Link
  • Office of Scientific & Technical Information Report Number: 1056436
  • Archival Resource Key: ark:/67531/metadc828234

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Office of Scientific & Technical Information Technical Reports

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

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  • September 30, 2012

Added to The UNT Digital Library

  • May 19, 2016, 9:45 a.m.

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  • July 21, 2016, 6:41 p.m.

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J., Baek; D., Diamond; Cuadra, A.; Hanson, A.L.; Cheng, L-Y. & Brown, N.R. Accident Analysis for the NIST Research Reactor Before and After Fuel Conversion, report, September 30, 2012; United States. (digital.library.unt.edu/ark:/67531/metadc828234/: accessed August 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.