A Qualitative Approach to Uncertainty Analysis for the Pwr Rod Ejection Accident

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In order to understand best-estimate calculations of the peak local fuel enthalpy during a rod ejection accident, an assessment of the uncertainty has been completed. The analysis took into account point kinetics parameters which would be available from a three-dimensional core model and engineering judgment as to the uncertainty in those parameters. Sensitivity studies to those parameters were carried out using the best-estimate code PARCS. The results showed that the uncertainty (corresponding to one standard deviation) in local fuel enthalpy would be determined primarily by the uncertainty in ejected rod worth and delayed neutron fraction. For an uncertainty in the ... continued below

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9 pages

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Diamond, D. J.; Aronson, A. & Yang, C. June 19, 2000.

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Description

In order to understand best-estimate calculations of the peak local fuel enthalpy during a rod ejection accident, an assessment of the uncertainty has been completed. The analysis took into account point kinetics parameters which would be available from a three-dimensional core model and engineering judgment as to the uncertainty in those parameters. Sensitivity studies to those parameters were carried out using the best-estimate code PARCS. The results showed that the uncertainty (corresponding to one standard deviation) in local fuel enthalpy would be determined primarily by the uncertainty in ejected rod worth and delayed neutron fraction. For an uncertainty in the former of 8% and the latter of 5%, the uncertainty in fuel enthalpy varied from 51% to 69% for control rod worth varying from $1.2 to $1.0. Also considered in the uncertainty were the errors introduced by uncertainties in the Doppler reactivity coefficient, the fuel pellet specific heat, and assembly and fuel pin peaking factors.

Physical Description

9 pages

Notes

INIS; OSTI as DE00759041

Source

  • 3RD INTERNATIONAL CONFERENCE ON NUCLEAR OPTIONS IN COUNTRIES WITH SMALL AND MEDIUM ELECTRICITY GRIDS, DUBROVNIK (HR), 06/19/2000--06/22/2000

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  • Report No.: BNL--NUREG-67430
  • Report No.: 401001060
  • Grant Number: AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 759041
  • Archival Resource Key: ark:/67531/metadc702193

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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.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • June 19, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Sept. 25, 2017, 5:17 p.m.

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Diamond, D. J.; Aronson, A. & Yang, C. A Qualitative Approach to Uncertainty Analysis for the Pwr Rod Ejection Accident, article, June 19, 2000; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc702193/: accessed December 11, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.