Model for incorporating fuel swelling and clad shrinkage effects in diffusion theory calculations

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Description

A model has been devised for incorporating into the thermal feedback procedure of the PDQ few-group diffusion theory computer program the explicit calculation of depletion and temperature dependent fuel-rod shrinkage and swelling at each mesh point. The model determines the effect on reactivity of the change in hydrogen concentration caused by the variation in coolant channel area as the rods contract and expand. The calculation of fuel temperature, and hence of Doppler-broadened cross sections, is improved by correcting the heat transfer coefficient of the fuel-clad gap for the effects of clad creep, fuel densification and swelling, and release of fission-product … continued below

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56 pages

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Schick, W.C. Jr.; Milani, S. & Duncombe, E. March 1, 1980.

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  • Main Title: Model for incorporating fuel swelling and clad shrinkage effects in diffusion theory calculations
  • Series Title: LWBR Development Program

Description

A model has been devised for incorporating into the thermal feedback procedure of the PDQ few-group diffusion theory computer program the explicit calculation of depletion and temperature dependent fuel-rod shrinkage and swelling at each mesh point. The model determines the effect on reactivity of the change in hydrogen concentration caused by the variation in coolant channel area as the rods contract and expand. The calculation of fuel temperature, and hence of Doppler-broadened cross sections, is improved by correcting the heat transfer coefficient of the fuel-clad gap for the effects of clad creep, fuel densification and swelling, and release of fission-product gases into the gap. An approximate calculation of clad stress is also included in the model.

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56 pages

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Dep. NTIS, PC A04/MF A01.

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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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  • March 1, 1980

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  • Feb. 10, 2018, 10:06 p.m.

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  • March 1, 2021, 4:06 p.m.

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Schick, W.C. Jr.; Milani, S. & Duncombe, E. Model for incorporating fuel swelling and clad shrinkage effects in diffusion theory calculations, report, March 1, 1980; West Mifflin, Pennsylvania. (https://digital.library.unt.edu/ark:/67531/metadc1090631/: accessed June 8, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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